TY - JOUR. T1 - Photoinduced reversible change of fluid viscosity. AU - Sakai, Hideki. AU - Orihara, Yoichi. AU - Kodashima, Hideki. AU - Matsumura, Atsutoshi. AU - Ohkubo, Takahiro. AU - Tsuchiya, Koji. AU - Abe, Masahiko. PY - 2005/10/5. Y1 - 2005/10/5. N2 - We report a reversible photoinduced fluid viscosity change. A small amount of a "photoswitchable" azobenzene-modified cationic surfactant (4-butylazobenzene-4′-(oxyethyl)trimethylammonium bromide, AZTMA) was added to a wormlike micellar solution of cetyltrimethylammonium bromide (CTAB) containing sodium salicylate (NaSal). The trans-AZTMA solution had a remarkably high viscosity as a result of the entangled network of wormlike micelles. UV light irradiation on the trans-AZTMA solution remarkably decreased the viscosity of the solution because the bulky structure of cis-AZTMA is likely to disrupt the network structure of wormlike micelles. This photoinduced viscosity change is perfectly reversible between the trans- and cis-AZTMA ...
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D1243 - 15 Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers , dilute solution viscosity, inherent viscosity, intrinsic viscosity, relative viscosity, specific viscosity, test method, vinyl chloride polymers,,
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Aim: To determine the viscoelastic properties of the porcine lens. Methods: Linear viscoelastic shear properties of the stroma of four porcine lenses were measured within 5 hours post-mortem, using sinusoidal oscillatory shear deformation. The elastic shear modulus, viscous shear modulus, dynamic viscosity, damping ratio, and phase shift of the lenses were quantified by a controlled-strain, linear simple-shear rheometer at frequencies of 10-50 Hz.. Results: The mean viscoelastic properties and their standard deviations across the frequencies examined were: the elastic shear modulus, G′ = 6.2±4.0 Pa, the viscous shear modulus, G″ = 19.2±2.5 Pa, the dynamic viscosity, η′ = 0.16±0.1 Pa•sec, the damping ratio ζ = 4.06±1.25, and the phase shift, δ = 76°± 5.6°.. Conclusions: The measured viscoelastic shear properties of the porcine lens reflect a low dynamic viscosity with a high damping ratio. The porcine lens is viscoelastic and is more viscous than elastic. The magnitude of the ...
The reorientation of a magnetic nickel nanorod placed at the air/phospholipid interface is used to calculate the surface viscosity of spread monolayers of phospholipids, dipalmitoyl phosphatidyl choline (DPPC) and dimyristoyl phosphatidyl ethanolamine (DMPE). While surface viscosity was found to depend on the surface pressure in both lipids, we detect an order of magnitude higher surface viscosity for DMPE films even in the so called liquid coexistence region. This difference is higher than that reported at higher surface pressures and is attributed to the smaller headgroup size of DMPE. The smaller size of the PE head group increases the ability of the lipid molecules to pack into more organized domains at all surface pressures. The minute changes in the morphology of the lipid film are more significant at the lower surface pressures, which contributes to a higher surface viscosity difference. Thus microrheology presents an insight into the degree of lipid organization at the air/water ...
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Case Study 16: In the modern pump industry, processed fluids are characterized by a wide spectrum of viscosity values. An unpredicted variation of actual process fluid properties, including viscosity, may lead to unexpected pump performance alteration. Also manufacturing deviations from expected internal pump geometry may cause pump performance deterioration. Both causes may determine undesired limitations of the pump operating range and plant production loss. The present Case Study illustrates a real case story of incorrect evaluation of the process fluid viscosity and pump geometry deviations, both determining performance deteriorations, described through a detailed evaluation of the internal pump losses. From the presentation of a real case, this case study highlights the importance of both the correct evaluation of viscous effects and the internal pump geometry through the application of existing loss correlations ...
The relationship of the microstructure of supercooled, highly viscous glycerol to the temperature dependence of its density, thermal expansion coefficient, and shear viscosity are discussed. The character of this temperature dependence at the transition from low viscosity state to the solid amorphous state solidified state without nuclei is described with help of function psi, which can be interpreted as the effective number of degrees of freedom responsible for the change of viscosity of glycerol over a broad range; these degrees of freedom are those related to the alpha-relaxation process. It is shown that the change in effective activation energy of the viscosity is completely determined by the parameter psi. The change in the shear viscosity of glycerol due to the influence of the solid-phase nuclei is considered. It is shown that the introduction of the parameter phi, equal to the specific volume occupied by the nuclei of the solid phase, together with psi provides a natural explanation ...
... , commonly known as Molylube 87M EP Grease, is an aluminum complex, multi-purpose grease formulated to extend the service life of machine components in the severe duty applications encountered in mining, quarrying, construction, cement and other heavy industries where its high base oil viscosity ensures maximum lubricating film thickness. Molylube Extreme Pressure High Viscosity Grease is especially effective when used to lubricate the suspension components of heavy-duty equipment such as excavators, dozers, loaders and haul trucks. The rust and corrosion inhibitors utilized in of Molylube Extreme Pressure High Viscosity Grease provide full protection of equipment surfaces. Grades 680-1 and 1000-1 are Komatsu approved.. ...
TY - JOUR. T1 - Viscosity change and structural transition of Molten Fe at 5 GPa. AU - Terasaki, Hidenori. AU - Kato, Takumi. AU - Urakawa, S.. AU - Funakoshi, K.. AU - Sato, K.. AU - Suzuki, A.. AU - Okada, T.. PY - 2002/4/15. Y1 - 2002/4/15. N2 - The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X-ray radiography method. Viscosity coefficients at about 2000 K were 15-24 mPa s at 2.7-5.0 GPa, and 4-9 mPa s at 5.0-7.0 GPa. Drastic decrease was found at around 5 GPa, at which stable solid phase below the melting temperatures change from delta (bcc) to gamma (fcc) phases. The observation indicates the possibility that the structural change in the molten Fe occurs in a narrow pressure interval (1 GPa) at the similar condition with the phase transformation in the solid.. AB - The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X-ray radiography method. Viscosity coefficients at about 2000 K ...
Viscosizer TD provides automated relative viscosity measurements with high reproducibility at low viscosity, to help identify molecules with abnormally high viscosity-concentration profiles at low sample concentrations as early as possible in the development pipeline.. ...
AMETEK Brookfield, the world standard for viscosity measurement and control, is offerings its Practical Course on Viscosity Measurements. This popular course was created to help AMETEK Brookfield Vi
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A low viscosity lubricating oil composition having a CCS viscosity less than 3500 mPa.s at −25 C. and having no more than 0.16 mass % of phosphorus which comprises a dispersant, and a detergent of calcium or magnesium or both; and optionally a zinc dihydrocarbyldithiophosphate, a viscosity modifier, a pour point depressant and an antioxidant. The oil satisfies the Cummins M11 cross-head wear engine test specification in a low phosphorus and low viscosity formulation.
TY - JOUR. T1 - Menthol-based eutectic mixtures. T2 - Hydrophobic low viscosity solvents. AU - Ribeiro, Bernardo D.. AU - Florindo, Catarina. AU - Iff, Lucas C.. AU - Coelho, Maria A Z. AU - Marrucho Ferreira, Isabel Maria. PY - 2015/9/10. Y1 - 2015/9/10. N2 - Inspired by one of the major problems in the pharmaceutical industry, we advantageously used the formation of eutectic mixtures to synthesize new solvents. The aim of this work is to identify low viscosity, cheap, biodegradable and hydrophobic eutectic solvents from natural resources. Consequently, novel eutectic mixtures based on DL-menthol and naturally occurring acids, namely pyruvic acid, acetic acid, L-lactic acid, and lauric acid, were synthesized and are here reported for the first time. The obtained DLmenthol-based eutectic mixtures were analyzed using NMR and FTIR spectroscopy in order to check their structures and purities and to confirm the interaction of the two compounds leading to the eutectic formation. Important solvent ...
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Experimental evidence is presented that the intrinsic viscosity of solutions of mixed proteins obeys the additive equation. See PDF for Equation.. The datum serves to characterize the system, and combined with other analytical techniques and fractionation procedures, enables one to analyze and characterize subfractions. The plasmas and sera of clinically "normal" individuals give intrinsic viscosity values agreeing with calculated values. The intrinsic viscosity values for pathological plasmas and sera in all cases are greater than normal and reflect the augmented levels of those proteins fibrinogen, α2-globulins, and γ-globulins occurring in the pathological state. The method is readily adaptable to routine clinical use and furnishes a measure of the departure from normal of protein levels in serum and plasma.. ...
Solvent-borne epoxy coatings are the dominant coating technology used to protect metal assets in the marine, petrochemical, and infrastructure markets, due to their excellent balance of properties, including corrosion resistance, chemical resistance, and adhesion. However, due to market and regulatory drivers for reduced volatile organic compound (VOC) emissions and improved worker safety, there is a need for new epoxy resins that enable ultra-high solids (|= 90%) epoxy coatings with improved performance for maintenance and protective coating applications. Currently available ultra-high solids coatings based on standard epoxy resins can suffer from a number of drawbacks, including high viscosity, poor spray application qualities, and reduced corrosion resistance. This paper will highlight a novel low viscosity epoxy (LVE) that demonstrates significantly lower viscosity versus standard bisphenol-A and bisphenol-F epoxy resins, while enabling ultra-high solids coatings with improved sprayability and
The dynamics of drop formation and pinch-off have been investigated for a series of low viscosity elastic fluids possessing similar shear viscosities, but differing substantially in elastic properties. On initial approach to the pinch region, the viscoelastic fluids all exhibit the same global necking behaviour that is observed for a Newtonian fluid of equivalent shear viscosity. For these low viscosity dilute polymer solutions, inertial and capillary forces form the dominant balance in this potential flow regime, with the viscous force being negligible. The approach to the pinch point, which corresponds to the point of rupture for a Newtonian fluid, is extremely rapid in such solutions, with the sudden increase in curvature producing very large extension rates at this location. In this region the polymer molecules are significantly extended, causing a localised increase in the elastic stresses, which grow to balance the capillary pressure. This prevents the necked fluid from breaking off, as ...
TY - JOUR. T1 - Evaluating viscosity of surimi paste at different moisture contents. AU - Yoon, Won B.. AU - Gunasekaran, Sundaram. AU - Park, Jae W.. PY - 2004. Y1 - 2004. N2 - The steady and dynamic shear viscosity of fish muscle protein paste obtained from Alaska pollock surimi at 95%, 90%, 85%, 80%, and 75% of moisture contents were measured in the temperature range of 5°C to 20°C. To estimate the steady shear viscosity at high shear rate from dynamic shear viscosity, the modified Cox-Merz rule was applied by introducing a frequency shift factor. The concentration dependence of zero-shear viscosity showed power-law dependence with an exponent of 3.5, and the universal behavior of viscosity at different protein concentrations was observed by a introducing reduced variables. The Carreau model was applied to describe the shear- thinning behavior of the surimi paste, and the model parameters estimated empirically showed moisture content dependence. The viscous flow behavior was independent of ...
The modeling of the viscous behavior of nanoemulsions and nanosuspensions is discussed. The influences of the viscosity ratio, solvation and aggregation of nanodroplets and nanoparticles on the relative viscosity of nanofluids are considered. The relative viscosity of a nanofluid is strongly affected by solvation of nanoparticles. The scaling of the relative viscosity of nanoemulsions is successfully carried out using the volume fraction of the solvated nanodroplets. Four sets of experimental relative viscosity data of nanoemulsions consisting of different diameter nanodroplets (27.5 nm-205 nm) all collapse on a single unique curve when the data are scaled on the basis of the volume fraction of the solvated nanodroplets. A similar scaling is achieved using six sets of experimental relative viscosity data on nanosuspensions consisting of different diameter nanoparticles (29 nm-146 nm). A new modified version of the Oldroyd model is proposed to describe and predict the viscosity of nanofluids. The model
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Improved very high viscosity (putty) two component polymerizable polyorganosiloxane composition for use in making dental impressions, having improved tear strength, handling and wettability. Improved tear strength results from inclusion of a quadri-functional polysiloxane having a vinyl content of 0.16 to 0.24 m-mole/g. Working time is maintained by including sufficient amounts of a retarder composition that delays onset of the vinyl polymerization. Handling is improved by the addition of a very high viscosity linear vinyl terminated polydimethylsiloxane which reduces tackiness and improves the shelf stability. Wettability is improved by including a surfactant resulting in a surface contact angle with water at three minutes of less than 50 . The surfactant chosen has an HLB of 8-11, such that the wetting contact angle is achieved within less than two minutes and remains wetting throughout the working time of the impression taking, substantially improving the impression making process.
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Cambridge Viscosity is the global leader in fluid viscosity measurement, including oil and gas; petroleum and biofuels; coatings, paints, and inks; pharmaceuticals, and other substances. Where accurate viscosity measurement is mission critical in both process and laboratory environments, Cambridge Viscosity technologies are chosen time and time again.. Our leadership is based on a quarter-century of experience, the extraordinary range of our products - including both in-line and in-tank applications - and our innovative proprietary technology. Our customers include leading organisations in oil and gas exploration, refining, automotive, research, industrial materials, and other high-stakes fields.. Cambridge Viscosity has set the standard for extraordinarily precise, reliable, and virtually maintenance-free viscosity measurement systems. Our sensors and viscometer systems conform to ASTM, DIN, JIS and ISO standards, with a range of models designed to meet specific industry and application needs. ...
TY - JOUR. T1 - Dynamic viscosity modeling of methane plus n-decane and methane plus toluene mixtures: Comparative study of some representative models. AU - Baylaucq, A.. AU - Boned, C.. AU - Canet, X.. AU - Zeberg-Mikkelsen, Claus Kjær. AU - Cisneros, Sergio. AU - Zhou, H.G.. PY - 2005. Y1 - 2005. N2 - Viscosity measurements of well-defined mixtures are useful in order to evaluate existing viscosity models. Recently, an extensive experimental study of the viscosity at pressures up to 140 MPa has been carried out for the binary systems methane + n-decane and methane toluene, between 293.15 and 373.15 and for several methane compositions. Although very far from real petroleum fluids, these mixtures are interesting in order to study the potential of extending various models to the simulation of complex fluids with asymmetrical components (light/heavy hydrocarbon). These data (575 data points) have been discussed in the framework of recent representative models (hard sphere scheme, friction ...
Read "Concentration effect of N-isopropylacrylamide on viscoelastic properties of hydrosoluble thermo-thickening copolymers, Polymer Bulletin" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Simple fluids like water (low viscosity), glycerin (high viscosity) are Newtonian and exhibit viscosity effects, the dissipation of energy when particles move in such fluids. But dissolve macromolecules in these liquids -synthetic or biopolymers-and networks can form. In addition to viscosity effects, there are now elasticity effects, the storage of energy when embedded particle move. By following the mean square displacement (MSD) of tracer (probe) particles in such fluid and microrheological properties such as η*, the complex viscosity, G″, the viscous loss modulus, and G′, the elastic storage modulus, can be determined as a function of frequency.. Measurement of the autocorrelation function (ACF) using DLS techniques yields the MSD of tracer particles, which, under the right conditions, can be used to determine η*, G″, and G′ over a range of frequencies much higher than mechanical rheometers can attain. Much smaller sample volumes, in the microliters, are possible compared to ...
D4683 - 17 Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C , absolute viscometer, absolute viscometry, dynamic viscosity, engine oils, high shear rate viscosity, high shear viscosity, high temperature viscosity, high shear rate viscosity at 150 ,°,C, rotational viscometer, rotational viscometry, Tapered Bearing Simulator Viscometer, TBS,,
Following the launch of the new m-VROCi, Viscometer/Rheometer On a Chip, at Pittcon 2014, Malvern Instruments will focus on the unique technology of this system and the considerable benefits it delivers in a webinar on 16 April 2014. The m-VROCi provides safe, accurate viscosity measurement for low viscosity industrial fluids, under conditions that reflect those that apply during end-product use.
I havent read any of the articles yet, so heres my big chance to insert my foot in my mouth. I will start collecting the references and will post what I learn, so public humiliation is a real possibility here. My guess is that the polymer is breaking up some sort of weak network in the solvent (hydrogen bonding, polar-polar interactions...) so that the solvent has a lower viscosity, thus leading to the negative intrinsic viscosity - and the need for a new theory to explain it. Yes, go with a new theory since the old theory made a certain set of assumptions that are no longer valid ...
While the above-mentioned viscosity modifiers can satisfy part of the oil recovery needs, these polymers still experience some challenges that hinder their effectiveness. For example, when the viscosity of reservoir oil is high, so should the displacing fluid be to match the mobility ratio. The current heuristics suggest that polymer flooding should be applied in reservoirs with oil viscosities between 10 and 150 cP (Taber et al. 1997).. The key factor limiting the recommended range is that for oil viscosities greater than 150 cP, the injected-water-viscosity values required for a favorable mobility ratio correspond to prohibitively low values of polymer injectivity. In addition, pumping high-viscosity displacing fluids tends to lead to clogging in oil wells, which results in a major economic well operating loss. One potential solution is to use displacement fluids with an adjustable viscosity, with the fluid having a low viscosity at the injection site and a high viscosity upon reaching the oil ...
In this study, changes in the viscoelastic material properties of brain tissue due to traumatic diffuse axonal injury (DAI) were investigated. The impact acceleration model was used to generate DAI in rat brain stem. The viscoelastic material properties of brain tissue along the corticospinal (CSpT) tract in the brain stem were characterized using an indentation technique and a quasilinear theory. The results show significant reduction in the elastic response of brain tissue due to injury. In regions with significantly more DAI, larger changes in the elastic shear modulus and relaxation function were observed. These findings can improve the injury predictability of computational models of brain injury.. Copyright © 2007 by ASME ...
We consider an effective field theory description of beyond-quasi-particle excitations aiming to associate the transport properties of the system with the spectral density of states. Tuning various properties of the many-particle correlations, we investigate how the robust microscopic features are translated into the macroscopic observables like shear viscosity and entropy density. The liquid-gas crossover is analysed using several examples. A thermal constraint on the fluidity measure, the ratio of shear viscosity to entropy density, is discussed. ...
Poulten Selfe and Lee Ltd is a UK company specializing in the viscosity measurement of new and used oils. The company was incorporated in 1931 and manufactures an established range of...
High viscosity systems utilize various blade configurations, such as double and triple shaft designs for high and medium viscosity substances, to consistently
In addition, in-service oil analysis includes various other parameters that have to be tested. Anton Paar provides the SVM 4001 and SVM 3001 Viscometers for measurements according to to ASTM D7042 respectively to DIN 51659-2 ASTM D7042. It is an excellent alternative to conventional capillary viscometers for fast and economical measurement of the low-shear kinematic viscosity over a wide temperature range. Consequently, ASTM D2270 references ASTM D7042 for the determination of kinematic viscosity. Automation of viscosity measurements provides several benefits over conventional manual measurements due to reduced handling errors, higher reproducibility, reduced costs per sample and increased productivity in the laboratory. This report describes specifically how to test inservice lube oils with the SVM 4001 in combination with Xsample 530 and a manually filled SVM 3001 to get data comparable to ASTM D445. ...
The viscoelastic material properties of biological systems are increasingly recognized as important parts of signaling cascades involved in developmental and pathological processes. They are furthermore assumed to play a crucial role in surviving extreme environmental conditions for certain organisms, such as yeast cells. Confocal Brillouin microscopy gives access to the viscoelastic material properties of single cells and tissues in a contact- and label-free manner and with a high spatial resolution. In combination with quantitative phase imaging, it is then possible to determine the longitudinal modulus and the viscosity of the sample. In this study, we probed living zebrafish larvae in all anatomical planes, at different time points during development and after spinal cord injury. We could show, that confocal Brillouin microscopy detects the viscoelasticity of different anatomical structures without affecting the animals development. We furthermore observed a transiently decreasing Brillouin ...
A low viscosity hot melt acrylic pressure sensitive adhesive polymer is formed by bulk polymerization of at least one alkyl acrylate monomer containing from about 4 to 8 carbon atoms in the alkyl group and present in an amount of from about 60 to about 95% by weight of the polymer, from 1 to about 10% by weight of a copolymerizable amide monomer, from 1 to 10% by weight of a copolymerizble carboxylic acid, and a positive amount up to about 6% by weight of the monomers of a copolymerizable anhydride, said polymer formed thermally reversible crosslinks with a metal cation having a valence of from 2 to 4. Viscosity of the polymer is typically from 2 to 8 Pa.s at 150 C. as formed and increases up to 100 Pa.s at 150 C. on addition of the metal cation.
TY - GEN. T1 - A method of numerical viscosity measurement for solid-liquid mixture. AU - Nomura, Reika. AU - Terada, Kenjiro. AU - Takase, Shinsuke. AU - Moriguchi, Shuji. PY - 2018/1/1. Y1 - 2018/1/1. N2 - We present a space-time homogenization procedure for multiscale modeling of solid-liquid mixture. The derived mathematical model enables us to set up two separate governing equations at both macro- and micro-scales. The fluid in the macroscopic governing equation is teated as an equivalent homogeneous medium with average or homogenized viscosity and is regarded as an incompressible Newtonian fluid, whose motion is assumed to be governed by the Navier-Stokes equations. The microscopic equations of motion governing the coupling phenomenon of the fluid and solid particles in a certain local domain and are solved to determine the microscopic flow fields under adequate boundary and loading conditions. Then the macrosopic viscosity is determined as the quantity averaged over the microscopic domain ...
Hydrokinetic theory of thermal fluctuations is applied to a nonconformal relativistic fluid. Solving the hydrokinetic equations for an isotropically expanding background we find that hydrodynamic fluctuations give ultraviolet divergent contributions to the energy-momentum tensor. After shifting the temperature to account for the energy of nonequilibrium modes, the remaining divergences are renormalized into local parameters, e.g., pressure and bulk viscosity. We also confirm that the renormalization of the pressure and bulk viscosity is universal by computing them for a Bjorken expansion. The fluctuation-induced bulk viscosity reflects the nonconformal nature of the equation of state and is modestly enhanced near the QCD deconfinement temperature.
When temperatures of viscous fluids change, so do their flow properties. With viscosity lowered by increasing temperature, a greater flow is generally required to create actuation pressure differential. A unique patented piston with Gems™ FS-930 Series switches accommodates these changes in fluid viscosity while maintaining accurate switch actuation. Units can detect flow rates with 20% accuracy for fluid viscosities between 40 to 1000 SSU.. ...
Ultra low viscosity alginate is extracted from brown algae, alginate can react with metal-salt to form a thermo-irreversible gels, Its good for our health with the properties of water absorption and ion-exchange,the alginate with low molecule has stronger biological activity and it has obvious function of health care and medical ...
PURPOSES : Surface treatment material for pavement preventive maintenance should be inspected field applicability. This study(Part II) aimed to checkup coating characteristics and performance analysis using lab and field tests. The hydrophobic - low viscosity filling material for pavement preventive maintenance is presented in Part I, which is a series of companion study. METHODS : Relative comparison between general asphalt mixtures and surface treatment asphalt mixtures are analyzed and measured for the field application such as indirect tensile strength ratio(TSR), abrasion resistance, crack propagation resistance, temperature resistance, coating thickness, permeability resistance and skid resistance in terms of british pendulum number(BPN). RESULTS : It is found that TSR, crack propagation resistance and permeability resistance is increased as against uncoated asphalt specimen. Abrasion resistance and temperature resistance is secured from the initial coating thickness point of view, which is
Low Viscosity Retainer is for high strength retention of slip fitted parts with a close clearance gap.. Gives additional strength to dynamic, axial and radial loads. Use to retain splines, plain bearings, bushes, keyways and pins.. Applications: ...
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