|p|Offering improved barrier properties, fire resistance, and strength, polymer nanocomposites are increasingly desirable as coating, structural, and packaging materials in a wide range of automobile, civil, and electrical engineering applications|b|. Polymer Nanocomposites|/b| offers a comprehensive review of the main types of polymer nanocomposites and their properties. Part I reviews the range of layered silicates and discusses such properties as flammability, thermal stability, barrier properties, wear resistant and biodegradability. Part II considers nanotubes, nanoparticles, and inorganic-organic hybrid systems, and analysis elasticity and strength as well as magnetic and light-emitting properties.|/p|
TY - JOUR. T1 - The influence of electrically conductive and non-conductive nanocomposite scaffolds on the maturation and excitability of engineered cardiac tissues. AU - Navaei, Ali. AU - Rahmani Eliato, Kiarash. AU - Ros, Robert. AU - Migrino, Raymond Q.. AU - Willis, Brigham C.. AU - Nikkhah, Mehdi. PY - 2019/2/1. Y1 - 2019/2/1. N2 - Utilization of electrically conductive nanomaterials for developing nanocomposite scaffolds has been at the center of attention for engineering functional cardiac tissues. The primary motive in the use of conductive nanomaterials has been to develop biomimetic scaffolds to recapitulate the extracellular matrix (ECM) of the native heart and to promote cardiac tissue maturity, excitability and electrical signal propagation. Alternatively, it is well accepted that the inclusion of nanomaterials also alters the stiffness and nano-scale topography of the scaffolds. However, what is missing in the literature is that to what extent the sole presence of nanomaterials ...
Polymer nanocomposites with practically all the commercial polymer matrices have been synthesized and nano-scale filler dispersion has been achieved with varying degrees of success. The commercial polymer nanocomposites studied to a great extent are unfortunately non-biodegradable like polyethylene, polypropylene and polystyrene etc. To a small extent, these nanocomposites are reformed or recycled into other products after one life cycle, however, the properties of such recycled materials are very poor. Therefore, subject of bio-based nanocomposites and biodegradable nanocomposites has become topic of interest in the recent years and a number of suitable bio-based and biodegradable polymer matrices have been developed and their property enhancement have been reported after the incorporation of the inorganic filler materials. These systems include poly(lactic acid), poly(butyl succinate), alginate, cellulosic plastics, gelatine, starch, soy protein based polymers, plant oil based polymers, poly
Using inorganic fullerene-like (IF) nanoparticles and inorganic nanotubes (INT) in organic-inorganic hybrid composite, materials provide the potential for improving thermal, mechanical, and tribological properties of conventional composites. The processing of such high-performance hybrid thermoplastic polymer nanocomposites is achieved via melt-blending without the aid of any modifier or compatibilizing agent. The incorporation of small quantities (0.1-4 wt.%) of IF/INTs (tungsten disulfide, IF-WS2 or molybdenum disulfide, MoS2) generates notable performance enhancements through reinforcement effects and excellent lubricating ability in comparison with promising carbon nanotubes or other inorganic nanoscale fillers. It was shown that these IF/INT nanocomposites can provide an effective balance between performance, cost effectiveness, and processability, which is of significant importance for extending the practical applications of diverse hierarchical thermoplastic-based composites.
A kind of molecular-level dispersed and highly oriented graphene monolayer nanocomposite film was successfully obtained by in situ reduction of phenyl isocyanate functionalized graphite oxide (RPIGO) in N,N-dimethylformamide in the presence of polystyrene (PS). Atomic force microscopy and transmission electron microscopy results show that the RPIGO monolayers were not only homogeneously intercalated into the PS matrix but also arranged parallel to the surface of the nanocomposite films. Because of the efficient interaction between the graphene monolayers and PS matrix, the mechanical properties of the graphene-based nanocomposite films improved significantly. Compared with the pure PS film, a 28.4% increase in the Youngs modulus and a 27.8% improvement in the tensile strength of the RPIGO-PS nanocomposites films were obtained with the addition of only 0.5 wt % graphite oxide. The glass-transition temperature and onset degradation temperature of PS also increased from 96.6 and 427°C to 103.2 ...
1. Introduction. In recent years there has been much attention given to polymer-clay nanocomposites, particularly those developed with layered silicates due to the need of more efficient engineering materials, and because of the fact that pure polymers do not present the properties needed for certain applications. Several methods have been applied for the preparation of polymer-clay nanocomposites, such as melting intercalation, the most used among them1.. Polymeric nanocomposites are hybrid materials where inorganic nanosized substances are dispersed in a polymer matrix2-3. Polymer layered silicate nanocomposites are compared to conventional polymeric composites due to the use of fillers to improve some specific properties1. Such nanocomposites present improvement on mechanical, thermal, flammability and dimensional stability properties, using low concentrations of silicate, around 1-5% by weight4.. From the surveys conducted by the Toyota group which developed polyamide 6 nanocomposites using ...
Polymer nanocomposites are composed of a nanofiller with a polymer matrix. Typical fillers include nanoclay, carbon nanotubes, nanoparticle silver, nanoalumina, etc. The materials exhibit unique material properties, such as improved barrier properties, flame retardance, and mechanical properties, depending on filler choice. A critical barrier to obtaining optimal properties is the need for excellent dispersion of the nanofiller, coupled with uniform distribution throughout the polymer matrix. To create the materials in an industrially relevant manner, continuous melt mixing processes are necessary. Dispersion is dependent on processing parameters, and functionalization of the filler to enhance compatibility with the polymer. During processing it is critical to provide sufficient energy input to the mixture to break up the agglomerated filler. Energy input is controlled by melt viscosity, temperature, screw speed, etc. Moreover, approaches to quantify the dispersion and distribution are needed. This work
Buy Polymer Nanocomposites Based on Inorganic and Organic Nanomaterials (Polymer Science and Plastics Engineering) by Sanat Mohanty From WHSmith today! ...
Polymer Nanocomposites Coating for Anticorrosion Application: 10.4018/978-1-5225-7838-3.ch009: Corrosion is the foremost reason for the deterioration of metallic components used in harsh environments and hence research on the development of an
Synthesis, Properties and Applications of Polymer Nanocomposites scheduled on April 16-17, 2020 in April 2020 in Cape Town is for the researchers, scientists, scholars, engineers, academic, scientific and university practitioners to present research activities that might want to attend events, meetings, seminars, congresses, workshops, summit, and symposiums.
Dielectric Polymer Nanocomposites provides the first in-depth discussion of nano-dielectrics, an emerging and fast moving topic in electrical insulation.
Abstract : Clay-based nanocomposites have been studied for several decades, mainly focusing on clay-polymer nanocomposites. Here, we report on a simple wet chemical method to synthesize clay-APTES-Au (CAAu) nanocomposites, where 3-aminopropyltriethoxysilane (APTES) acts as the linkage. The silane terminal of APTES formed bonds with the clay surface, while the other -NH(2) terminal bonds to gold nanoparticles. The color of clay changed when these CAAu nanocomposites were formed. By changing the size of the gold nanoparticles, the color of CAAu could be adjusted, simply by changing process parameters. TEM characterization of the synthesized nanocomposites showed an even distribution of gold nanoparticles on the clay surfaces. The nanocomposites were stable in strong acid and high concentration of salt conditions, while strong basic solution like NaOH could slightly influence the status of the gold nanoparticles due to the rupture of the Si-O-Si bonds between APTES and clay. To demonstrate the ...
Zinc oxide-PVA nanocomposite films were fabricated adopting a simple method based on solution-casting, incorporating small weight percentages (,1.2 wt%) of ZnO in PVA (∼0.625×10{sup −3}M to 7×10{sup −3}M), and their structure, morphology, linear and low threshold nonlinear optical properties were investigated. The films were characterized as nanostructured ZnO encapsulated between the molecules/chains of the semicrystalline host polymer PVA. The samples exhibited low threshold nonlinear absorption and negative nonlinear refraction, as studied using the Z-scan technique. A switchover from SA to RSA was observed as the concentration of ZnO was increased. The optical limiting of 632.8 nm CW laser light displayed by these nanocomposite films is also demonstrated. The estimated values of the effective coefficients of nonlinear absorption, nonlinear refraction and third-order nonlinear susceptibility, ,χ{sup (3)},, compared to those reported for continuous wave laser light excitation, measure ...
After their discovery in 1991 by Iijima [1], carbon nanotubes (CNTs) have attracted considerable interest because of their unique as well as superior physical, electrical, magnetic, chemical stability, thermal conductivity and mechanical properties [2]. Due to their exceptionally high aspect ratio and mechanical properties, incorporation of small amounts of CNTs into a polymer matrix is expected to enhance the properties of the resulting nanocomposites more than any existing material. The most critical issue of CNTs/polymer nanocomposites is the adhesion/compatibility between the nanotubes and polymer which ultimately controls the interface between the CNTs and the polymer matrix. Unfortunately pure CNTs are insoluble in any organic solvents and they tend to form agglomerates because of strong Van der Wall forces which results in negative effects on the properties of the resulting nanocomposites. As such achieving a high degree of dispersion of CNTs in any polymer matrix is quite a challenging ...
The intrinsically conducting polymer (ICP), polyaniline (PANI) has been synthesized by chemical polymerization process with the help of water soluble support polymer poly (vinyl pyrrolidone) (PVP). The X-ray diffraction of synthesized PANI-PVP polymer reveals that the polymeric nanocomposites are partially crystalline with orthorhombic phase at room temperature. The morphology of these composite polymers has been studied by Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). The dielectric measurement of the sample is performed in the frequency range 100 Hz - 1MHz and temperature range 213-313 K. An analysis of real and imaginary parts of dielectric permittivity and the electric modulus indicate the polydispersive nature of relaxation time as confirmed by Cole-Cole plot of the complex permittivity. The frequency dependence of modulus spectra is found to obey an Arrhenius law with activation energy of 0.07 eV. The frequency dependent electrical data has been analyzed in ...
List of Contributors. Preface.. Editor Biographies.. 1 Nanocomposites: State of the Art, New Challenges and Opportunities (Ranimol Stephen and Sabu Thomas).. 1.1 Introduction.. 1.2 Various Nanofillers.. 1.3 Rubber Nanocomposites.. 1.4 Future Outlook, Challenges and Opportunities.. References.. 2 Manufacturing Techniques of Rubber Nanocomposites (Jun Ma, Li-Qun Zhang and Li Geng).. 2.1 Introduction.. 2.2 Melt Compounding.. 2.3 Solution Blending.. 2.4 Latex Compounding.. 2.5 Summary.. Acknowledgments.. References.. 3 Reinforcement of Silicone Rubbers by Sol-Gel In Situ Generated. Filler Particles (Liliane Bokobza and Amadou Lamine Diop).. 3.1 Introduction.. 3.2 Synthetic Aspects.. 3.3 Properties of the Hybrid Materials.. 3.4 Conclusions.. References.. 4 Interface Modification and Characterization (Jun Ma, Li-Qun Zhang and Jiabin Dai).. 4.1 Introduction.. 4.2 Rubber Nanocomposites Without Interface Modification.. 4.3 Interface Modification by Nonreactive Routes.. 4.4 Interface Modification by ...
This article reviews nanocomposites focusing on their impact and recent trends in the field of bone grafting. Although autogenous- and allogeneic-bone grafts have been used for a long time in bone therapies, there is still a donor shortage and infection risk. As an alternative, synthetic biomaterials have been developed and clinically used as bone grafts, but most of them differ substantially from natural bone either compositionally or structurally. It remains a great challenge to design an ideal bone graft that emulates natures own structure. Owing to the composition and structural similarity to natural bone, most of the current investigations involve the use of nanocomposites, particularly hydroxyapatite/collagen system, as promising bone grafts, but it is surprising that none of the reports review the rationale and design strategy of such nanocomposites in detail for the benefit of researchers. Accordingly, this article addresses the state-of-the-art of those nanocomposites and provides ...
Chitosan, a natural polymer, is a biomaterial which is known to be osteoconductive but lacking in mechanical strength. In this work, to further enhance the mechanical property and biocompatibility of chitosan, we combined it with both chondroitin sulfate, a natural glycosaminoglycan found in bone, and nano-SiO 2. The composite scaffold of chitosan/chondroitin sulfate/nano-SiO 2 was fabricated by lyophilization. The nanocomposite scaffold showed enhanced porosity, degradation, mechanical integrity, biomineralization and protein adsorption. Biocompatibility and cell attachment-proliferation studies performed using MG-63 cells, advocate its better performance in vitro. To improve the cell seeding efficiency, we coated the scaffold surface with fibrin, which enhanced the initial cell attachment. The cumulative results suggest this novel nanocomposite scaffold to be a suitable candidate for bone tissue engineering. Copyright © 2012 American Scientific Publishers All rights reserved.. ...
TY - JOUR. T1 - Experimental evidence for reduced chain segment mobility in poly(amide)-6/clay nanocomposites. AU - Miltner, Hans E.. AU - Rahier, Hubert. AU - Pozsgay, András. AU - Pukánszky, B.. AU - Van Mele, Bruno. PY - 2005. Y1 - 2005. N2 - Poly(amide)-6/clay nanocomposites are investigated by means of modulated temperature differential scanning calorimetry. The importance of polymer-filler interaction is explored by comparing nanocomposites based on untreated and organically modified clay. During quasi-isothermal crystallization experiments, an excess contribution is observed in the recorded heat capacity signal due to reversible melting and crystallization. The magnitude of this excess contribution depends on the nanocomposite investigated. We suggest that it is directly related to the segmental mobility of the polymer chains in the interphase region. As such, the magnitude of this excess contribution can be used to quantify the efficiency of the polymer-clay interaction. Depending on ...
Strategies for bone tissue engineering and regeneration rely on bioactive scaffolds to mimic the natural extracellular matrix and act as templates onto which cells attach, multiply, migrate and function. Of particular interest are nanocomposites and organic-inorganic (O/I) hybrid biomaterials based on selective combinations of biodegradable polymers and bioactive inorganic materials. In this paper, we review the current state of bioactive and biodegradable nanocomposite and O/I hybrid biomaterials and their applications in bone regeneration. We focus specifically on nanocomposites based on nano-sized hydroxyapatite (HA) and bioactive glass (BG) fillers in combination with biodegradable polyesters and their hybrid counterparts. Topics include 3D scaffold design, materials that are widely used in bone regeneration, and recent trends in next generation biomaterials. We conclude with a perspective on the future application of nanocomposites and O/I hybrid biomaterials for regeneration of bone.
The effect of hybrid carbon fillers of multi-walled carbon nanotubes (CNT) and carbon black (CB) on the electrical and morphological properties of polystyrene (PS) nanocomposites were systematically investigated in microinjection molding (μIM). The polymer nanocomposites with three different filler concentrations (i.e. 3, 5 and 10 wt%) at various weight ratios of CNT/CB (100/0, 30/70, 50/50, 70/30, 0/100) were prepared by melt blending, then followed by μIM under a defined set of processing conditions. A rectangular mold insert which has three consecutive zones with decreasing thickness along the flow direction was adopted to study abrupt changes in mold geometry on the properties of resultant microparts. The distribution of carbon fillers within microparts was observed by scanning electron microscope, which was correlated with electrical conductivity measurements. Results indicated that there is a flow-induced orientation of incorporated carbon fillers and this orientation increased with
The current study discusses the preparation and long-term performance of polymer composites used for various purposes under different ageing conditions.. The first part deals with the preparation and characterization of polymer nanocomposites based on poly(ethylene-co-butyl acrylate) (EBA-13 and EBA-28 with 13 and 28 wt % butyl acrylate, respectively) and 2-12 wt % (0.5-3 vol %) of aluminum oxide nanoparticles (two types with different specific surface areas and different hydroxyl-group concentrations; uncoated and coated with, respectively, octyltriethoxysilane and aminopropyltriethoxysilane). The nanocomposite with EBA-13 showed better overall nanoparticle dispersion while EBA-28 resulted in poor dispersion, probably due to insufficiently high shear forces acting during extrusion mixing which were unable to break down nanoparticle agglomerates.. The activity of hindered phenolic antioxidant (0.2 wt%) in all EBA nanocomposites was assessed by determining the oxidation induction time using DSC. ...
A robust processing of polymers into antimicrobial materials is introduced using polymer/clay nanotechnology. Antimicrobial activity of commercially available organoclays modified with cationic surfactants has been screened in tests against gram-negative Escherichia coli and gram-positive Staphylococcus aureus bacteria. Despite the leaching biocidal surfactants, cell interactions with organoclay surface have been identified to be responsible for antimicrobial activity of organoclays. Distribution of clay platelets within polymer matrix by melt extrusion process resulted in polymer/clay nanocomposites active against both gram-positive and gram-negative bacteria by contact. The study discloses a much overlooked function of organoclays modified with cationic surfactants for nanocomposite application, i.e., the ability of organoclays to render polymer nanocomposites biocidal ...
The cellulose nanofibril from wood is an interesting new material constituent that can provide strong reinforcement in polymer nanocomposites due to the high stiffness of the cellulose crystals and the network formation characteristics of the nanofibrils. Cellulose nanofibrils can be used either in the form of low aspect ratio microcrystalline cellulose, MCC, or as high aspect ratio microfibrillated cellulose, MFC. The objective is to study structure-property relationships for cellulose nanofibril networks and composites.. Nanocomposites based on MCC and thermoplastic polyurethane were prepared by in-situ polymerization. The cellulose nanofibrils were successfully dispersed in the matrix and the composites showed improvements in stiffness, strength, as well as in strain-to-failure. Cellulose nanofibrils reinforce the physical rubber network by strong molecular interaction with the rubber.. A method that facilitates microfibrillation of the pulp cell wall during homogenization has been developed. ...
A general family of magnetic nanocomposites formed by FeNi3 ferromagnetic nanoparticles (NPs) embedded in a graphitized carbon matrix is reported. The soft chemical approach used relies on the catalytic effect of the NPs resulting from the thermal decomposition of the layered double hydroxide precursor, which acts as a multilayered nanoreactor enabling the formation of a range of carbon nanoforms (CNFs). This is followed by acid treatment of the as-prepared nanocomposites to isolate the different CNFs formed. These range from carbon nano-onions to graphene depending on the temperature of the thermal decomposition. This synthetic process paves the way for the rational design of metal-carbon nanocomposites with controllable composition as precursors of nanocarbons or even graphene. The coexistence of metal NPs and nanostructured carbon is a major source of applications. As a proof of concept, the electrochemical performance of these metal-carbon hybrid supercapacitors is studied under high ...
Polymer dielectric materials have many beneficial properties when it comes to energy storage for advanced electronics and power systems. While the materials are highly flexible and have good chemical stability, their main drawback is their limitation of functionality in primarily low working temperatures. In turn, this limits the wider use of polymer dielectric materials for applications such as electric vehicles and underground oil exploration.. However, researchers from Pennsylvania State University have developed a flexible, high-temperature dielectric material from polymer nanocomposites that looks promising for the application of high-temperature electronics.. The researchers, including current ECS member Lei Chen, were able to stabilize dielectric properties by crosslinking polymer nanocomposites that contain boron nitride nanosheets. In testing, the energy density was increased by 400 percent while remaining stable at temperatures as high as 300° C.. With the nanocomposites having huge ...
TY - JOUR. T1 - Water-triggered modulus changes of cellulose nanofiber nanocomposites with hydrophobic polymer matrices. AU - Dagnon, Koffi L.. AU - Shanmuganathan, Kadhiravan. AU - Weder, Christoph. AU - Rowan, Stuart J.. PY - 2012/6/12. Y1 - 2012/6/12. N2 - Biomimetic, stimuli-responsive nanocomposites were made using either poly(styrene-co-butadiene) (SBR) or polybutadiene (PBD) as the hydrophobic, low-modulus matrix and hydrophilic cellulose whiskers isolated from tunicates (TW) as the high-modulus filler. These materials were prepared using a template approach, which involves the formation of a percolating TW network and filling this template with either of the matrix polymers. Dynamic mechanical analysis (DMA) studies of the dry nanocomposite films reveal that the incorporation of TWs into the rubbery polymers increases the tensile storage modulus E′ significantly. The reinforcement is attributed to the formation of a three-dimensional TW network within the SBR and PBD matrices. The ...
Poly(methyl methacrylate) (PMMA) nanocomposites containing an organoclay and triphenyl phosphate (TPP) were prepared by solution blending using a PMMA solution in methyl methacrylate (MMA) solvent. Exfoliated nanostructures were shown by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The optical transmittance of the PMMA nanocomposites decreased with an increase in the clay content. The improvement in the thermal stability of the PMMA nanocomposites was greater in air than in nitrogen. Nanocomposite formation brought about reductions of the peak heat release rate (PHRR), as measured by cone calorimetry. The combination of the nanoclay and TPP brought about a further decrease in the PHRR and an increase in the average specific extinction area (ASEA, related to smoke production). Copyright © 2008 John Wiley & Sons, Ltd.
RP techniques are matured manufacturing technologies widely employed in traditional industries such as automobile industry and telecommunication (phone) industry during the design process. They were first borrowed and used by the medical device industry to produce accurate models or prosthesis for surgical planning and simulation (Berry et al. 1997; Petzold et al. 1999). With the emergence and development of tissue engineering, various biomaterials and RP techniques are being investigated to specifically fabricate porous scaffolds with different architectures and properties, targeting at the regeneration of different tissues such as bone, cartilage, blood vessel, spinal cord, etc. (Lopez-Heredia et al. 2008; Xu et al. 2008; Woodfield et al. 2009; Silva et al. 2010). Furthermore, complex organ regeneration can potentially benefit from RP techniques with the fabrication/formation of functionally graded scaffolds or cell printing based on tissue spheroids (Leong et al. 2008; Mironov et al. 2009). ...
Abstract: The lithium form of taeniolite served as the molecular template for carbon nanocomposites. It was intercalated with hydroxyaluminum and hydroxyaluminum-zirconium cations. Aliquots of the inorganic matrices were saturated by furfuryl alcohol followed by its interlayer polymerization. The structures were heated at 973 K in nitrogen to carbonize the polymeric precursor. Additional materials were mixed with polypropylene glycol which was then carbonized within the mineral layers. The surface properties of the nanocomposites were studied by X-ray diffraction (XRD), DTA, SEM and sorption experiments (sorption of nitrogen). The results showed that structural properties of the derived materials depend on the inorganic matrix and organic precursor. The carbon-taeniolite nanocomposites derived from polyfurfuryl alcohol as a precursor were characterized by high carbon content and a high percentage of its surface area in micropores. A broad spectrum of surface characteristics of the final products ...
Recent studies on bone regeneration demonstrate the use of low cost and stable small molecules, which avoid the adverse effect and high cost of growth factors. Herein, we investigate the chemotactic, angiogenic and osteoinductive potential of a prostacyclin analogue, ONO-1301, when delivered through a biomim
Keylontic Dictionary( 2012). historical procedure: The ResearchGate on victim with your civil genes. The energy of the study thirteen( 13) by Hillel ben David.
Smart polymers represent a new class of advanced materials with a wide range of applications. The stimuli responsive polymers respond to external stimuli, such as heat or light, by a change of physical properties. The self-healing polymers belong to the most promising applications of a smart behavior. They are stimuli responsive and possess the ability to self-heal when damaged. The project involves the synthesis and characterization of the novel smart polymers with enhanced mechanical properties. The thermo- or photo sensitive systems and self-healing materials will be studied and reinforced by application of polymer nanocomposites. The sensitive unit is presented by physical supramolecular structures or by reversible covalent bonds containing moieties. The project will be focused on (i) study and understanding of the response mechanism to the thermo- and photo-stimuli in smart polymer nanocomposites, and on (ii) thermo- and photo induced self-healing of materials with a high mechanical ...
The book has practical examples from literature, patents, and existing commercial products. Readers can design new work based upon the material in the book or use it as a handy reference for interpreting existing work and results.
The Porters five forces analysis has been considered by analysts to present a clear picture of the vendor landscape to readers. Agreements, mergers, acquisitions, and other dealings have been further mentioned in the study. It focuses on the strategies, products, and market share along with position of the companies operating in the market.
THERMOPLASTIC NANOCOMPOSITES. Polymer nanocomposites (pdf) are composed of a nanofiller dispersed into a polymer matrix. Typical fillers include nanoclay, carbon nanotubes, nanoparticle silver, nanoalumina, etc. Nanocomposite materials exhibit unique material properties, such as improved barrier properties, flame retardance, and mechanical properties, depending on the choice of filler. The materials have application for lighter weight structural parts, barrier materials for improved packaging (e.g MREs), EMI shielding, and antimicrobial performance. One of the barriers to obtaining optimal properties is the need for excellent dispersion and distribution of the nanofiller coupled with quantitative dispersion measurement techniques. To create the materials in an industrially relevant manner, continuous melt mixing processes are necessary. We have expertise in twin screw mixing of numerous nanofillers in a wide range of thermoplastics. Contact us to see how we can help your company develop the next ...
Novolac phenol formaldehyde NPF resin/organobentonite clay nanocomposites were prepared and modified with epoxy and/or urethane resin via solution technique. The prepared samples at organoclay...
The present invention is in the field of polymer interlayers used in multiple layer glass panels, and specifically the present invention is in the field of antiblocking agents for polymer interlayers and methods of effectively incorporating such agents into interlayers.
Although hepatocytes have a remarkable regenerative power, the rapidity of acute liver failure makes liver transplantation the only definitive treatment. Attempts to incorporate engineered three-dimensional liver tissue in bioartificial liver devices
The ability to encapsulate linear nanoparticle chains in scrolled nanosheets is an important advance in the formation of nanocomposites. Recent work in our group resulted in the in situ formation of peapod-like structures based on chains of cobalt nanoparticles. Building on this initial success, we have developed a more versatile approach that allows for the capture of a series of preformed nanoparticles. During solvothermal treatment, exfoliated hexaniobate nanosheets scroll around highly ordered chains of nanoparticles to produce the target peapod structures in high yield. This chemistry is especially flexible such that nanocomposites can be formed with a variety of nanoparticles including metals, quantum dots and metal oxides. Further, this approach demonstrates selectively, encapsulating nanoparticles according to their size. Beyond the 1D peapod structures, noble metal functionalized sheets (2D) with tunable magnetic, electronic, optical, and catalytic properties can also be fabricated. The
US nanocomposites demand will grow 21 percent annually through 2011 as nanomaterial and composite prices decline. Higher-priced resins, such as engineering plastics used in applications where cost is not a critical factor, will lead gains. Packaging and motor vehicles will remain two key early markets. This study analyzes the $860 million US nanocomposites industry. It presents historical demand data for the years 2001 and 2006 and forecasts for 2011, 2016 and 2025 by nanocomposite product (e.g., thermoplastic, thermoset); market (e.g., packaging, motor vehicles, construction, electrical and electronics, consumer); and nanomaterial (e.g., carbon black, clays, minerals, nanotubes). The study also considers market environment factors, identifies industry participants and profiles 54 of them, including resin manufacturers, independent compounders, suppliers of nanoscale materials, and firms that formulate composites for their own use.
In this work, Polycaprolactone (PCL), silver nitrate (AgNO3) and zinc oxide (ZnO) were used for fabrication of a multilayered antibacterial nanocomposite material using co-axial electrospinning (CAE). 5, 10, and 15 wt. % concentrations of PCL were utilized, and varying amounts of AgNO3/ZnO were used in all samples to increase antibacterial activity. Products were analysed using Scanning Electron Microscopy (SEM) to obtain the morphological characterization, and Fourier Transform Infrared Spectroscopy (FTIR) was used to determine the functional groups of the PCL, AgNO3, and ZnO materials in the electrospun nanocomposites. Tensile strength was also determined for each sample. Additionally, viscosity, density, and electrical conductivity were measured for each prepared solution before the CAE process. The antibacterial activity of the fabricated electrospun nanocomposite materials was tested against Staphylococcus aureus and Eschericha coli strains. A simple nanoscale assembly approach was provided using
Poly(lactide) (PLA)-carbon nanotubes (CNTs) stereocomplex nanocomposites were prepared by blending of commercial poly(l-lactide) (PLLA) and CNT-g-poly(d-lactide) (CNT-g-PDLA), where CNT-g-PDLA was synthesized via ring-opening polymerization initiated by modified CNTs. FT-IR, DSC, and XRD studies showed that stereocomplex crystallites could be formed between the PLLA matrix and CNT-g-PDLA. The incorporation of CNTs leads to a lower crystallization activation energy and an enhanced crystallinity in solution-casting samples. This is mainly due to the heterogeneous nucleating effect of CNTs, as demonstrated by TEM study which shows the existing of stereocomplex crystallization possibly initiated by CNTs. The homogeneous dispersion of CNTs and the formation of a stereocomplex between CNT-g-PDLA and PLLA lead to a better mechanical properties of the resulting nanocomposites. © 2013 The Royal Society of Chemistry ...
TY - JOUR. T1 - Nanodiamond-induced UV transparency in phosphate glasses and development of plasmonic Cu nanocomposites. AU - Jiménez, José A.. AU - Sendova, Mariana. PY - 2020/9/15. Y1 - 2020/9/15. N2 - Nanodiamond (ND) powder has been explored as a means for improving the ultraviolet (UV) transparency of phosphate glasses of interest to high-performance optics. Binary barium phosphate (BaO:P2O5) glasses were prepared by melting wherein increasing amounts of ND powder were added to batch materials up to 0.1 wt%. Besides a detailed UV/Vis optical analysis, structural characterizations were performed by X-ray diffraction, Raman scattering and 31P nuclear magnetic resonance spectroscopies. The data was consistent with a structural modification suggesting P-O-C bond formation accompanying the ND-induced UV transparency. Further, the reductant character of diamond was exploited for reducing CuO in the glass matrix and ultimately produce plasmonic Cu nanocomposites upon thermal treatment.. AB - ...
Highlights from research on different nanocomposites and nanostructures for sensing and other energy related applications will be presented. The synthesized nanostructures and nanocomposites presented here were all obtained using the low temperature (, 100 °C) chemical approach. Nanostructures featured by small foot-print and synthesized by the low temperature aqueous chemical approach allows the utilization of non-conventional solid and soft substrates like e.g. glass, plastic, textile and paper. We here present results from different metal oxide nanostructures employed for chemical sensing and some innovative energy related applications. Efficient sensitive and selective sensing of dopamine, melamine, and glucose are presented as some examples of self-powered sensors utilizing the electrochemical phenomenon i.e. transferring chemical energy into electrical signal. Further the use of nanomaterials for developing selfpowered devices utilizing mechanical ambient energy is presented via ...
Fully green materials have experienced fast growth in the past several decades,and cellulose nanofiber (CNF) and cellulose nanocrystal (CNC) are the preferred choice for the manufacture of environmentally friendly nanocomposites and fully green bionanocomposites. We focus on the recent research and progress made on cellulose-reinforced bionanocomposites where CNF or CNC serves as the nanophase in a matrix made of synthetic or bio-based polymers or their derivatives. At the same time, the role of CNF and CNC in these bionanocomposites will be elucidated and elaborated upon. Finally, the perspective and current challenges of CNF- and CNC-enhanced bionanocomposites in future preparation andapplication are outlined.. ...
Polymer nanocomposite materials exhibit enhanced properties relative to ordinary polymers. Here, we describe recent work concerning the development of novel polymer-clay nanocomposites. One route for the production of these materials is to disperse clay in a polymerisable monomer solvent. When a desired degree of clay dispersion is achieved the solvent can be polymerised in-situ to obtain the nano-composite material. Our work attempts to control the morphology of the clay particles in the liquid precursor solvent, with the aim of producing a range of polymer-clay nanocomposite materials with a range of properties depending on the type of polymer, type of clay, and morphology of dispersion. Although previous work indicated that full exfoliation, and possibly full dispersion, of organically modified clay in monomer solvent can be achieved under appropriate conditions, and hence that the phase behaviour of dispersed clay can be controlled, we find that this is not the case. Instead, we find using ...
This article is from Nanoscale Research Letters, volume 6.AbstractA novel Co/InP magnetic semiconductor nanocomposite was fabricated by electrodeposition...
Electrospun polymeric core-shell nanocomposites are exploited as templates to manipulate molecular self-assembly for preparing structural lipid nanoparticles, during which the confinement effect of fibers together with their core-shell structure, the aqueous environment and the secondary interactions, all contributed synergistically to facilitate molecular self-aggregation to produce lipid nanoparticles with a drug entrapment efficiency of 95.9% with a sustained drug release profile.. ...
An efficient and rapid protocol for the synthesis of 2-amino-3-cyanopyridines by the cyclocondensation reaction of aromatic aldehydes, methyl ketones, malononitrile and ammonium acetate catalyzed by SnO2/SiO2 nanocomposite material at refluxed condition in ethanol was investigated. Nanocomposite (SnO2/SiO2) catalytic material has been synthesized by using the sol-gel method. The prepared catalytic materials were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmer-Teller (BET) surface area, and temperature-programmed desorption of ammonia (NH3-TPD). Advantages of the present method include a simple work-up procedure, high yields of the products, low toxicity and easy recovery and reusability of the catalytic materials.. Keywords: SnO2/SiO2, sol-gel, nanocomposite, 2-amino-3-cyanopyridines, heterogeneous catalyst. ...