• The present work exposes the correlations that can be established between particle dispersion and polymer chain conformation with the viscoelastic behavior of the materials at rest and under deformation across different examples of nanocomposites. (cea.fr)
  • The flow behavior is mostly driven by the polymer chain contribution whose physical origin is related to specific polymer-particle interactions. (cea.fr)
  • In this review, we first give a brief introduction of scaling behavior of nanopatterned polymer brushes and then summarize recent progress in fabrication and application of nanopatterned polymer brushes. (duke.edu)
  • For LCST polymers the inverse behavior is observed. (wikipedia.org)
  • We develop a computational model to simulate the behavior of photo-responsive polymer gels that contain spirobenzopyran (SP) chromophores. (aps.org)
  • Thanks to the complementary information combinatorial QCM-D and ellipsometry can provide, these two allow one to simultaneously monitor both polymer brush swelling and deswelling behavior, as well as attachment and detachment of protein. (biolinscientific.com)
  • We first develop an analytical theory for the statistical behavior of a polymer chain emanating from a crystallite, predicting the average distance to the first kink that would trap a charge. (aiche.org)
  • Polymers, Solutions, Gels and Phase Behavior. (lu.se)
  • Putting together "soft" polymer chains and "hard" particles of similar nanometer size opens also the way to new questions of fundamental physics associated to polymer chains conformation and dynamic, dispersion mechanisms and confinement effects. (cea.fr)
  • With a combination of SANS with different contrast variation methods, we demonstrate that the polymer chain conformation is not modified by the filler suggesting that the number of chains involved in the viscoelastic processes is low. (cea.fr)
  • Adhesion is a molecular event where polymer chains contact with a material surface to form an interfacial layer. (elsevierpure.com)
  • Chains altered their local conformations with a quartz surface more quickly than a hydrophobic alkyl-functionalized one. (elsevierpure.com)
  • We probe by SANS the conformation of polymer chains of the matrix in various nanocomposites based on the same building blocks, namely spherical magnetic nanoparticles of maghemite (γ-Fe2O3) as fillers and polystyrene (PS) for the matrix. (cnrs.fr)
  • Even with high degrees of polymerization N , between 40 and 1000, the polymer chains studied were not entangled. (epj.org)
  • the global deformation of the polymer chain, and p , the number of statistical units of locally relaxed sub-chains. (epj.org)
  • The dynamics of the comb-like polymers is discussed in terms of living clusters from which junctions are produced by interactions between side chains. (epj.org)
  • Thermoresponsive polymer chains in solution adopt an expanded coil conformation. (wikipedia.org)
  • Adsorption of Polymer Chains onto Charged Spheres: Experiment and Theory. (mpg.de)
  • Though these early simulations were limited to chains of a few $N_e$, they demonstrated the potential of computer simulations to contribute to our understanding of polymer dynamics. (aps.org)
  • Further evidence for the tube models of polymer dynamics has been obtained by identifying the primitive path mesh that characterizes the microscopic topological state of the computer- generated conformations of the chains. (aps.org)
  • UV-Vis kinetic study also indicatedthe change in the conformation and aggregation of PNIPAM chains during gelation. (ias.ac.in)
  • However, the large variety of possible assemblies between different kind of polymers and particles makes difficult to dispose of a general trend to describe the correlations between the local structure of the materials and their macroscopic properties. (cea.fr)
  • We first discuss different strategies (chemical grafting, magnetic field, specific additives or controlled sample processing) to control the filler dispersion inside the polymer matrix with different particles (colloidal or industrial silica, magnetic nanoparticles) dispersed in polymers (Polystyrene, Poly (methyl methacrylate)) or elastomers (Styrene-Butadiene-Rubber). (cea.fr)
  • ii) for the athermal interaction between grafted particles and polymer, the radius of gyration is either unchanged when particles are individually dispersed or compressed of almost 11% when particles are forming overlapped clusters. (cnrs.fr)
  • Despite the remaining relatively small deviations, this is to our best knowledge the first unambiguous experimental evidence on a single system of the influence of the well-known nanofiller dispersion onto the mean chain conformation in nanocomposites for different polymer-particles interactions ranging from attractive to repulsive. (cnrs.fr)
  • The activity and selectivity towards nitrogen and ammonia of this reaction is strongly affected by the temperature and concentration profile inside the catalyst particles, making this chemistry ideal for probing these polymer-coated catalysts. (utwente.nl)
  • Many biological processes and applications involve the motion of small (nanoscale) spherical particles through a dense (typically) semiflexible polymer matrix. (aps.org)
  • Scanning and transmission electron microscopy were conducted to confirm particle image and to visualize the conformation of HPV16 vaccine particles released from microparticle formulation. (cdc.gov)
  • In order to identify a good substitute of PFPEs to alleviate those negative effects, as well as decrease the magnetic spacing, the nanofilm conformation of a novel lubricant, called comb-like polymers (CLPs), confined to the silicon wafer surface has been investigated via studying the molecular weight dependence of the monolayer thickness in this thesis. (pitt.edu)
  • The stress-strain curves during the stretching and relaxation processes show differences between the isotropic and nematic comb-like polymers. (epj.org)
  • Here we report the dilute solution conformations of two types of linear dendronized polymers, obtained by cryogenic transmission electron stereography and tomography. (fu-berlin.de)
  • Configurational and frictional properties of polymers in dilute solution. (sabanciuniv.edu)
  • Chiral Studies Across the Spectrum of Polymer Science: From dilute solution to the glassy state, from liquid crystals to peptide nucleic acids, to viruses and most recently investigations of plant based method of control of arthropod disease vectors. (nyu.edu)
  • Specifically, we highlight applications of nanopatterned stimuli-responsive polymer brushes in the areas of biomedicine and biotechnology. (duke.edu)
  • Thermoresponsive polymers belong to the class of stimuli-responsive materials, in contrast to temperature-sensitive (for short, thermosensitive) materials, which change their properties continuously with environmental conditions. (wikipedia.org)
  • This thesis presents a proof of concept of self-regulating mechanism by a heterogeneous catalyst in combination with stimuli responsive polymer. (utwente.nl)
  • Thus far, the self-regulating mechanism using stimuli responsive polymers has never been demonstrated for heterogeneous catalysis. (utwente.nl)
  • We finally propose some strategies to progress in the understanding of the specific polymer-chain interactions with nanocomposites using grafted nanoparticles. (cea.fr)
  • [2] it is a refinement of the Zimm-Bragg model that recognizes that a polypeptide alpha helix is only stabilized by a hydrogen bond only once three consecutive residues have adopted the helical conformation. (wikipedia.org)
  • However, she soon discovered the density of DNA and, more importantly, established that the molecule existed in a helical conformation. (hindustantimes.com)
  • R double-helical conformation. (lu.se)
  • Methods for the characterization of the molar mass and the radius of gyration of polymers in solution. (tum.de)
  • The fluorescent transient of single polymers of a PPV derivative, poly(2,5-dioctyloxy p-phenylene vinylene) (DOO-PPV) spin-cast in polystyrene matrix is observed. (mmu.edu.my)
  • We provide a molecular explanation suggesting that TMAO molecules have a greater thermodynamic binding affinity with the collapsed conformation of polystyrene than with the extended conformation, while the reverse is true for urea molecules. (ibpc.fr)
  • Weights are assigned at each position in a polymer as a function of the conformation of the residue in that position and as a function of its two neighbors. (wikipedia.org)
  • If alternative conformations are present, remove the residue conformation (found in point 4 above) with the lowest occupancy and note which residues are disordered. (lu.se)
  • Conformation and phase diagrams of flexible polyelectrolytes. (mpg.de)
  • Polymers and polyelectrolytes of various conformations are used in many applications where there is a need to tailor the interfacial properties to promote a certain interaction with the surrounding environment. (biolinscientific.com)
  • The molecular architecture of polymers is a key factor that affects the conformational, dynamic, and viscoelastic properties of polymer melts. (aip.org)
  • 1-3 Ring polymers, unlike linear and branched polymers that have free chain ends, exhibit distinct physical properties in polymer melts due to their topology, which reduces the number of conformations available to the molecule. (aip.org)
  • Molecular simulations have been a powerful tool in studying the static (structural and conformational), dynamic, rheological, and topological (e.g., threading events) properties of ring polymer melts. (aip.org)
  • Polymer solutions and melts. (bath.ac.uk)
  • Mechanical properties of polymers: methods and moduli, creep, relaxatin and oscillatory experiments, viscoelastic polymer melts and cross-linked rubber. (tum.de)
  • Twenty years ago at the APS March Meeting, Kurt Kremer and I presented the first numerical evidence from computer simulations that the reptation model of Edwards and de Gennes correctly describes the dynamics of entangled linear polymer melts. (aps.org)
  • Here I will review the progress over the past twenty years and present an outlook for the future in modeling entangled polymer melts and networks. (aps.org)
  • In particular, the plateau moduli derived on the basis of this analysis quantitatively reproduce experimental data for a wide spectrum of entangled polymer liquids including semi-dilute theta solutions of synthetic polymers, the corresponding dense melts, and solutions of semi-flexible (bio)polymers such as f-actin or suspensions of rodlike viruses. (aps.org)
  • Surfaces with end-grafted, nanopatterned polymer brushes that exhibit well-defined feature dimensions and controlled chemical and physical properties provide versatile platforms not only for investigation of nanoscale phenomena at biointerfaces, but also for the development of advanced devices relevant to biotechnology and electronics applications. (duke.edu)
  • From our previous study, linear polymers in a cylindrically confined polymer melt were found to segregate from each other as a result of the strong correlation hole effect that is enhanced by the confining surfaces. (aip.org)
  • The hydrophilicity of oxygen plasma-reated polymer surfaces decays with storing time in air environments. (ncsu.edu)
  • Films below 50 Å were also shown to be effective in stabilizing the plasma treated polymer surfaces. (ncsu.edu)
  • The properties of permeable flocs and adsorbed polymer (polyelectrolyte) layers formed on the colloidal surfaces remain to be worked out in relation to inhomogeneous porous structure and electrokinetics in the future. (hindawi.com)
  • Find out more about how to use QCM-D for polymer characterization and to analyze polymer interactions at surfaces. (biolinscientific.com)
  • For both weakly and moderately attractive surfaces, the DNA desorbs from the surface in a zipped form and acquires the conformation of a. (lu.se)
  • For both weakly and moderately attractive surfaces, the DNA desorbs from the surface in a zipped form and acquires the conformation of a melted state with the rise in temperature. (lu.se)
  • In this work, the chain conformation and aggregation formation of a high charge mobility donor-acceptor polymer (DPPDTT) are systematically investigated by using small-angle neutron scattering (SANS) and static/dynamic light scattering (SLS/DLS). (cea.fr)
  • Low energy difference between the envelope (Cs symmetry) and twisted (C2 symmetry) conformations of the THF molecule leads to the interconversion between the two conformers. (researchgate.net)
  • 1. Is the molecule a monomer of a polymer? (lu.se)
  • Interfacial Conformation of Hydrophilic Polyphosphoesters Affects Blood Protein Adsorption. (mpg.de)
  • In order to reveal the roles of the polymers, the elementary rate process of polymer reaching to colloidal interface and subsequent reconformation process into more stable adsorption state are needed to be analyzed. (hindawi.com)
  • We have studied the rheology and the conformation of stretched comb-like liquid-crystalline polymers. (epj.org)
  • For this, macroscopic demonstration samples (elastomers, partly crystalline polymers, super absorbers) are used to elucidate the effects described in the lecture. (tum.de)
  • Only a few commercial applications exist, for example, cell culture plates coated with an LCST-polymer. (wikipedia.org)
  • In the presence of a thermo-responsive polymer, such as poly(n-isopropylacrylamide) (p-NIPAM), the increase of temperature causes the polymeric brushes to collapse after surpassing a certain temperature, the so called Lower Critical Solution Temperature (LCST). (utwente.nl)
  • also, the MIPs released the intercepted α -lipoic acid inside polymers, and the lower critical solution temperatures (LCST) of MIPs and nonimprinted polymers (NIPs) are 25.7°C and 19.4°C, respectively. (hindawi.com)
  • In particular, in the case of thermosensitive polymers, the lower critical solution temperature (LCST) decides the thermosensitive property through the phase transition at a specific temperature [ 20 ]. (hindawi.com)
  • The theory of thermoresponsive polymer (similarly, microgels) begins in the 1940s with work from Flory and Huggins who both independently produced similar theoretical expectations for polymer in solution with varying temperature. (wikipedia.org)
  • Read about how QSense QCM-D was used in the development of a new thermoresponsive polymer brush with antifouling properties for biomedical applications. (biolinscientific.com)
  • The determination of intrinsic chain stiffness of conjugated polymers is challenging, in particular, for scattering techniques because of their strong light absorption and structural instability due to the complicated intra-/intermolecular interactions. (cea.fr)
  • We suggest focusing on the chain dynamic with inelastic neutron scattering and some synthesis developments to manage the interface chain mobility or the polymer-chain interactions without changing the filler dispersion. (cea.fr)
  • In the case of polymer solutions, polymer-polymer, solvent-solvent and polymer-solvent interactions have to be taken into account. (wikipedia.org)
  • The resulting equation for the change of Gibbs energy consists of a term for the entropy of mixing for polymers and an interaction parameter that describes the sum of all interactions. (wikipedia.org)
  • Computations have been performed on random coil and wormlike models of linear chain polymers, star polymers, hyperbranched polymers, dendrimers, cyclodextrins, ssDNA and proteins and their interactions with and without functionalized carbon nanotubes. (cmich.edu)
  • Native or wild-type quaternary protein structure is usually born from a single translated protein sequence with one ordered conformation with downstream protein interactions. (medscape.com)
  • How osmolytes influence hydrophobic polymer conformations: A unified view from experiment and theory. (ibpc.fr)
  • Results presented here from both experiment and simulation are in line with earlier predictions on a model Lennard-Jones polymer while also demonstrating the distinction in the mechanism of osmolyte action between protein and hydrophobic polymer. (ibpc.fr)
  • under illumination with blue light, the chromophores assume a closed ring conformation and are hydrophobic. (aps.org)
  • Amyloid fibrils are protein polymers comprising identical monomer units (homopolymers). (medscape.com)
  • I am interested in studying rheological properties polymers and biopolymers and applying mathematical techniques, statistical mechanics and molecular modeling to study the properties of biological and synthetic macromolecules. (cmich.edu)
  • Furthermore, lignin-based hydrogels have shown great potential for various biomedical applications, and their copolymerization with other polymers and biopolymers further expands their possibilities. (bvsalud.org)
  • In this study, we use molecular dynamics simulation to investigate the chain conformations and dynamics of ring polymers under planar (1D) confinement as a function of film thickness. (aip.org)
  • This robust method enables to check that only the polymer chain form factor is effectively probed in a very accurate way. (cnrs.fr)
  • They suggest that, in the nematic phase, the chain dynamics is more cooperative than for a usual linear polymer. (epj.org)
  • The nematic interaction increases the lifetime of these junctions and, strikingly, the relaxation is the same at all scales of the whole polymer chain. (epj.org)
  • Conformation of cylindrical brushes in solution: Effect of side chain length. (mpg.de)
  • Nomenclature for the description of polymers and statistical models to describe the chain conformation. (tum.de)
  • Introduction to the statistical mechanics of chain molecules Molecular weight distribution in linear and nonlinear polymers, theory of gelation. (sabanciuniv.edu)
  • The MFα1 sense and antisense primers were labeled with fluorescent probes FAM (blue) and TET (green), and polymerase chain reaction amplicons were analyzed with 3% polymer at 30°C under nondenaturing conditions. (cdc.gov)
  • The backbone conformations of individual, unperturbed synthetic macromolecules have so far not been observed directly in spite of their fundamental importance to polymer physics. (fu-berlin.de)
  • To address these challenges, previous research has successfully used synthetic polymers, which mimic natural antimicrobial peptides produced by bacteria to kill other bacteria. (sc.edu)
  • naturally occurring, semi synthetic and completely synthetic polymers. (niir.org)
  • M. Rubinstein, R.H. Colby: Polymer Physics, Oxford 2003. (tum.de)
  • G. Strobl: The Physics of Polymers. (tum.de)
  • J.M.G. Cowie: Polymers: Chemistry & Physics of Modern Materials, CRC 1991. (tum.de)
  • However, the connection between molecular ordering and device performance is difficult to predict due to the current need for a mathematical theory of the physics that dictates charge transport in semiconducting polymers. (aiche.org)
  • Fluorescence Correlation Spectroscopy in Dilute Polymer Solutions: Effects of Molar Mass Dispersity and the Type of Fluorescent Labeling. (mpg.de)
  • Because they are dense, highly crosslinked, and chemically stable, diamond-like carbon (DLC) films and silicon oxide films (SiOx) were deposited on poly(ethylene terephthalate) by plasma-enhanced chemical vapor deposition to restrict polymer surface dynamics. (ncsu.edu)
  • In 1980 Professor Green began investigations of the cooperative properties of polymers in the Herman Mark Polymer Research Institute of Brooklyn Poly, now the New York University Tandon School of Engineering. (nyu.edu)
  • However, since polymers display a molar mass distribution this straightforward approach may be insufficient. (wikipedia.org)
  • Understanding the structure and dynamics of polymers under confinement has been of widespread interest, and one class of polymers that have received comparatively little attention under confinement is that of ring polymers. (aip.org)
  • Effect of repeat unit flexibility on dendrimer conformation as studied by atomistic molecular dynamics simulations. (ncsu.edu)
  • In this study, the effects of ultrathin films on surface dynamics of these polymers were investigated. (ncsu.edu)
  • v Liquid crystals - 83.10.Nm Polymer dynamics - 61.12.Ex Neutron scattering techniques (including small-angle scattering) - 83.50. (epj.org)
  • We focus on the dynamics of the pseudorotation process, in particular, the lifetime of the THF conformations and their mutual rearrangements. (researchgate.net)
  • In a stricter sense, thermoresponsive polymers display a miscibility gap in their temperature-composition diagram. (wikipedia.org)
  • Swelling of thick polymer brushes investigated with ellipsometry. (mpg.de)
  • This collapse of the gels is caused by the decrease in hydration due to conformational changes and not by a light-induced heating of the polymer network. (aps.org)
  • XRD data of dry polymers and their correspondingdry gels showed shifting in the peak positions. (ias.ac.in)
  • Rheological study showed that stronger gels wereformed with increasing isotacticity of PNIPAM while lower isotactic sample exhibited typical polymer meltrheology. (ias.ac.in)
  • The properties of non-concatenated ring polymers can also be important in biological fields because ring polymers have been proven to be a good model to study DNA organization in the cell nucleus. (aip.org)
  • For transistor applications, polymer molecular conformation and thin film morphology have been shown to influence charge carrier mobility, and subsequently the device electrical properties 3 . (nature.com)
  • Polymer brushes, polyelectrolyte multilayers and hydrogels are typically used to achieve desirable properties. (biolinscientific.com)
  • Key parameters influencing these properties are layer conformation and the degree of hydration. (biolinscientific.com)
  • The self avoiding walk (SAW) model of the polymer has been extended to study the equilibrium properties of double stranded DNA (dsDNA) where two strands of the dsDNA are modeled by two mutually attracting self-avoiding walks (MASAWs) in the presence of an attractive surface. (lu.se)
  • In the chemistry and biochemistry department, professor Chuanbing Tang 's laboratory developed a new class of antimicrobial molecules, called multicyclic cationic antimicrobial polymers. (sc.edu)
  • If their conformation can be changed by an external excitation, they are so-called 'programmable' molecules. (europa.eu)
  • Molecular modelling calculationshowed that the number of solvent molecules involved in forming gel (polymer-solvent compound)decreased with the increase in the isotacticity of the polymer. (ias.ac.in)
  • Her work to make clearer X-ray patterns of DNA molecules and laid the foundation for James Watson and Francis Crick to suggest in 1953 that the structure of DNA is a double-helix polymer, a spiral consisting of two DNA strands wound around each other. (hindustantimes.com)
  • Phase diagrams of polymer solutions and blends: thermodynamic description, discussion of the free energy, construction of phase diagrams, description of demixing mechanisms. (tum.de)
  • For linear polymers, the "tube-model" and Rouse model have been well established to describe the motion of polymers with and without entanglements, respectively. (aip.org)
  • For this purpose, two isomers of a comb-like polymetacrylate polymer, of well-defined molecular weights, were synthesized: one displays a nematic phase over a wide range of temperature, the other one has only an isotropic phase. (epj.org)
  • The phase separation temperature (and hence, the cloud point) is dependent on polymer concentration. (wikipedia.org)
  • We observe a different ratio between envelope (Cs) and twisted (C2) conformations with respect to a change of the temperature. (researchgate.net)
  • These polymers have the unique ability to reversibly change conformation from a swollen to a collapsed state in response to an environmental stimulus (e.g. temperature or pH). (utwente.nl)
  • Furthermore, the stimulus-responsive technology has been applied in imprinted polymers including but not limited to responding to chemical (pH) and physical condition (temperature) [ 18 , 19 ]. (hindawi.com)
  • It increased with the increasein the concentration and isoacticity of the polymer, and with the decrease in the temperature. (ias.ac.in)
  • Polymers dissolve in a solvent when the Gibbs energy of the system decreases, i.e., the change of Gibbs energy (ΔG) is negative. (wikipedia.org)
  • 0.64±0.06, which indicates a slightly stretched random coil conformation. (pitt.edu)
  • designed, synthesized, and investigated the effects of a cationic comb polymer on the stability of aqueous silica suspensions of varying ionic strength and pH. (rpi.edu)
  • Our previously-obtained impressive results of highly increased C2C12 mouse myoblast adhesion to amine plasma polymers (PPs) motivated current detailed studies of cell resistance to trypsinization, cell proliferation, motility, and the rate of attachment carried out for fibroblasts (LF), keratinocytes (HaCaT), rat vascular smooth muscle cells (VSMC), and endothelial cells (HUVEC, HSVEC, and CPAE) on three different amine PPs. (nature.com)
  • All these experimental results indicated that gelation occurs presumably through polymer-solventcompound formation. (ias.ac.in)
  • Scholars@Duke publication: Nanopatterned polymer brushes: conformation, fabrication and applications. (duke.edu)
  • Instead, an external stimulus is applied to alter the catalyst activity depending on the polymer conformational state when polymeric brushes are coated on a nano cluster. (utwente.nl)
  • This thesis provides significant insights on the interplay between polymeric brushes, using a thermo-responsive polymer (p-NIPAM), and catalytic performance of a palladium alumina porous catalyst (Pd/Al 2 O 3 ) by combining diffusion studies and rigorous reaction kinetics measurements. (utwente.nl)
  • Soft matter is a convenient term encompassing a wide range of materials, such as polymers, surfactants, colloids, emulsions, liquid crystals and various biological materials. (lu.se)
  • Use of a paramagnetic core to affect longitudinal nuclear relaxation in dendrimers - A tool for probing dendrimer conformation. (ncsu.edu)
  • Independent chromophores align in the majority of cases suggesting that the polymer maintains a rod-like structure in the absence of defects. (mmu.edu.my)
  • Non-aligned chromophores are the result of defects that introduce 'kinks' in the polymer conformation. (mmu.edu.my)
  • By comparison, our subsequent study of linear polymers in confined thin films at similar levels of confinements found only the onset of segregation. (aip.org)
  • This macromolecular structure and conformation may open an avenue toward a next-generation of antimicrobial agents to treat MDR Gram-negative bacteria. (sc.edu)
  • Both the comb polymer and its homopolymer analog were synthesized and analyzed leading to the discovery that comb polymer-coated silicamicrospheres (green) remain stable over a broad range of solution conditions, whereas pure homopolymer-coated silica microspheres (red) rapidly fall out of suspension. (rpi.edu)
  • A water soluble polymer is a polymer that can be diluted in water, with or without the assistance of co solvents and neutralizing agents, to form transparent solutions. (niir.org)
  • functional molecular or supramolecular systems and conjugated polymers at the nanoscale: these systems are designed to give a 'function' to the surface they are linked with. (europa.eu)
  • Our results show that conformations of ring polymers are similar to the linear polymers under planar confinement, except that ring polymers are less compressed in the direction normal to the walls. (aip.org)
  • While we find that the correlation hole effect is enhanced under confinement, it is not as pronounced as the linear polymers under 2D confinement. (aip.org)
  • In this paper, the main work was to study the theoretical self-assembly process of thermosensitive molecularly imprinted polymers (MIPs) for α -lipoic acid and to investigate thermosensitive functional monomers through density functional theory calculations (DFT) and intermolecular weak interaction analysis. (hindawi.com)
  • For branched polymers, due to the entropy barrier between different conformations, the longest relaxation time exhibits exponential growth with strand length, which is explained by the arm retraction model. (aip.org)