maximum storage modulus of colloid
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Shear modulus of colloidal suspensions: Comparing experiments …
A minimum in the storage modulus is observed at 5 Hz, which is followed by a drastic increase in the storage modulus up to a frequency of 8 Hz, and a complete collapse of the elastic structure at frequencies above 8 Hz.
يتعلم أكثرStretchable, compressible, and conductive hydrogel for sensitive …
The chemical property of the hydrogels was characterized by FTIR (Figure S1 a).For the PVA/PAA DN hydrogel (blue), the peak at 3350 cm −1 could be attributed to the vibration of O H. The characteristic peaks at 1452 and 1250 cm −1 were attributed to the asymmetric and symmetric stretching of COO– and C O respectively, confirming the …
يتعلم أكثرTensile storage modulus of nano-zircon-reinforced poly(methyl …
Results showed that the maximum storage modulus was reached by the composite with n-Z of 5 wt%. The composite exhibited storage modulus 1239 MPa higher than that of pure PMMA. The glass transition temperature of the PMMA/n-Z also increased, i.e., from 73°C for the pure PMMA to 86°C for the composite with 5 wt% n-Z …
يتعلم أكثرThermal and mechanical properties of stereocomplex polylactide enhanced by nanosilica | Colloid …
Finally, the thermostability, storage modulus, and mechanical properties of the ternary nanocomposites were also highlighted in this work. It is expected that the combination of silica nanoparticles and stereocomplexation can improve the multiple properties of PLA, which is of great help for further extending of the properties of …
يتعلم أكثرDevelopment and modification of conventional Ouali model for tensile modulus …
Additionally, the maximum modulus of 35 Pa is achieved by G* = 1.1 Pa and λ = 70 s demonstrating that a high complex modulus and extended relaxation time of components improve the dynamic moduli.
يتعلم أكثرMECHANICAL PROPERTIES OF COLLOIDAL GELS SHIH, J. LIU, …
studied the storage modulus and the yield strain of boehmite gels and found that they are related to the particle concentration in a power-law fashion [1]. Similar scaling behavior of …
يتعلم أكثرUnderstanding Rheology of Structured Fluids
Eugene Bingham, a colloid chemist, first coined the term "Rheology." He also showed that for many real fluids a ... non-linear and the storage modulus declines. So, measuring the strain amplitude dependence of the storage and loss moduli (G'', G") is a good ...
يتعلم أكثرHybrid colloidal gels with tunable elasticity formed by charge …
The storage modulus of the colloidal gels based on entirely negatively charged Laponite, i.e. LapRDS, reached the maximum at R = 1, where the zeta potential …
يتعلم أكثرUnusual multiscale mechanics of biomimetic nanoparticle hydrogels
The increase of storage moduli for GSH-Au is associated with greater strength of the van der Waals interactions between the Au NPs than between CdTe NPs; …
يتعلم أكثرHyperreflective photonic crystals created by shearing colloidal …
In this study, we optimally formulate a photocurable dispersion of silica particles and apply shear flow to unify the orientation of the colloidal crystals, ensuring …
يتعلم أكثرInfluence of particle modulus on the rheological properties of …
Agar concentrations in the range 0.5–5 wt % are utilized, giving a range of particle modulus spanning 2.4–185 kPa. On increasing the particle modulus, in suspensions with phase volumes above maximum packing, the storage modulus increases by two orders of magnitude although the loss tangent (tan δ) also increases …
يتعلم أكثرViscoelastic properties of copolycarbonates comprising isosorbide and 1,4-cyclohexanedimethanol
Viscoelastic properties of copolycarbonate materials comprising isosorbide (ISB) and cyclohexanedimethanol (CHDM) were studied as a function of the ISB content. In the glassy state, β dispersion was clearly detected in the dynamic mechanical spectra. The tensile storage modulus E′ at room temperature increased with the ISB content, and the …
يتعلم أكثرInfluence of co-solvent on the rheological behavior of aqueous viscoelastic surfactant solutions | Colloid …
Colloid and Polymer Science - We have studied the influence of glycerol on the rheological behavior of viscoelastic surfactant solutions. The measurements were carried out on the system CTAB and... Equation 2 indicates that viscosity is determined by a product of two quantities, one of which is determined by the structure (shear modulus, G …
يتعلم أكثرCharacterization of storage modulus of starch suspensions during the initial stages of pasting using Stokesian dynamics simulations …
Fig. 3 shows the comparison between experimental storage modulus and the simulation results for 25 μm and 116 μm particles. Overall, the experimental data agree very well with the values obtained by Stokesian dynamics. From Fig. 3 it is evident that G′ is independent of particle size and is only dependent on volume fraction.
يتعلم أكثرStorage Modulus
Generally, storage modulus (E'') in DMA relates to Young''s modulus and represents how flimsy or stiff material is. It is also considered as the tendency of a material to store energy [ 244 ]. Loss modulus ( E'''' ) is regarded as the ability of a material to dissipate energy, which is sensitive to various transition, relaxation processes, molecular motions, morphology …
يتعلم أكثرEffect of abaca reinforced polymer composite on dynamic mechanical analysis | Colloid …
The chemically modified abaca fiber displays significant interfacial adhesion between the fiber and the matrix. 8C3 illustrates the maximum improvement in storage modulus value at higher temperature. Hence, 30% of weight fraction of abaca (treated with 8 wt%/vol% of NaOH) reinforced polymer composite that exhibits high storage modulus …
يتعلم أكثرColloidal gel elasticity arises from the packing of locally glassy clusters
Colloidal gels are typically composed of solid particles dispersed in a liquid, which show some peculiar mechanic properties but their origins remain largely unsolved. Here, Whitaker et al ...
يتعلم أكثرSurface rheological behavior of gelatin/ionic liquid …
2, and the storage modulus is larger than loss modulus for gelatin/[C 12-4-C 12 im]Br 2, indicating that gelatin/[C 12-4-C 12 im]Br 2 is an elastic film. With increasing the concentration of imidazolium gemini surfactant, the …
يتعلم أكثرExperimental characterization of colloidal silica gel for water …
At high shear rates i.e. 100 s –1, the formed solid gels showed a viscosity, storage modulus and loss modulus of 100–2600 mPa s, 2–57 Pa and 7–430 Pa …
يتعلم أكثرPhysicochemical Mechanics of Bacterial Cellulose | Colloid …
Abstract Bacterial cellulose is a product of the vital activity of some types of bacteria. In contrast to plant cellulose, it is characterized by high purity, strength, and elasticity. Together with nontoxicity and biocompatibility, these properties make bacterial cellulose to be applicable in biotechnology, medicine, and production of composites as a …
يتعلم أكثرRecorded T sol-gel, maximum storage modulus, and viscosity …
PCT20 thermoresponsive cellulose/PF127 composite hydrogel with 20 w/v% PF127 and 3 w/v% OPEFB cellulose showed high mechanical strength (storage modulus and complex viscosity values of 20.90 kPa ...
يتعلم أكثرStructural properties of nonionic surfactant/glycerol/paraffin lyotropic liquid crystals | Colloid …
The storage modulus, G′, and the loss modulus, G″, of the lamellar phase are shown for several formulations in Fig. 7a and b. Fig. 7. a Storage modulus, G ′, of the two-component samples II and IV, the three-component sample 1, and the four-component sample 3. b Loss modulus, G ″, of the two-component samples II and IV, the …
يتعلم أكثرT sol-gel and maximum storage modulus of poloxamer 407 …
PCT20 thermoresponsive cellulose/PF127 composite hydrogel with 20 w/v% PF127 and 3 w/v% OPEFB cellulose showed high mechanical strength (storage modulus and complex viscosity values of 20.90 kPa ...
يتعلم أكثرSylvain RAT | Alexander von Humboldt Fellow | PhD in …
Sylvain RAT, Alexander von Humboldt Fellow | Cited by 1,312 | of Max Planck Institute of Colloids and Interfaces, Potsdam (MPIKG) | Read 28 publications | Contact Sylvain RAT ...
يتعلم أكثرEffect of Particles Alignment on Giant Reduction in Dynamic Modulus of Hydrogels Containing Needle-Shaped Magnetic Particles | SpringerLink
E′/E′ m is the storage modulus divided by maximum storage modulus E′ m in the linear viscoelastic regime shown in Fig. 3. E′/E′ m for carrageenan gel without magnetic particles had a value of approximately 0.7.
يتعلم أكثرRheological properties of wormlike micelles formed in concentrated region of nonionic surfactant (C16E7)-water system | Colloid …
Colloid and Polymer Science - Rheological measurements have been made in concentrated micellar solutions (up to 40 wt%) of heptaethylene glycol n-hexadecyl ether (C16E7)/D2O system. The stress... Viscoelastic spectra Figure 2 shows frequency dependences of the storage modulus (G′) and the loss modulus (G″) at 20 wt% for …
يتعلم أكثر3. Maximum of storage modulus G'' max (a, c) and …
All the hydrogels showed frequency dependence viscoelastic behaviors with a higher storage modulus (G′) than the loss modulus (G ″ ) across the whole range of frequencies tested, suggesting...
يتعلم أكثرComparative rheological study of ionic semi-IPN composite …
Ionic semi-interpenetrating polymer networks composite hydrogels were synthesized by free-radical polymerization using dextran sulphate (DxS), acrylamide as monomer and N,N′-methylene(bis)acrylamide as cross-linking agent. The viscoelastic properties of these composite hydrogels were investigated by oscillatory shear …
يتعلم أكثرColloid chemistry approach to understand the storage stability of fermented carrot …
The most obvious change also happened at 37 C for WSP. The proportion of sugar content ranged from 40% to 60% under storage, and that of uronic acid varied between 35% and 56%. Download : Download high-res image (1MB) Download : …
يتعلم أكثرScalable production of structurally colored composite films by …
We found that the polymer molecular weight and colloid volume fraction in the supramolecular composite played crucial roles in shear-induced colloidal ordering …
يتعلم أكثرMorphology, rheological, thermal, and mechanical properties of …
Colloid and Polymer Science - Propylene-ethylene random copolymer (PEC) elastomer was used to toughen high-density polyethylene (HDPE). The morphology, thermal behavior, rheological, and mechanical... where ΔH 0 m is the theoretical melting enthalpy of 100% HDPE crystal, and its value is 287.3 J g −1 []. α is the mass …
يتعلم أكثرInvestigation of the link between micromechanical interparticle …
Current theory suggests how one may use measured κ o to estimate bulk colloidal gel shear moduli, G. In cases where the theory is appropriate, direct …
يتعلم أكثرShear modulus of colloidal suspensions: Comparing experiments …
In this work, the experimentally determined shear modulus of a colloidal suspension has been compared to a calculated shear modulus based on an ordered …
يتعلم أكثرRheological insights on Carboxymethyl cellulose hydrogels
The storage modulus was superior over the loss modulus for all the concentrations of CMC hydrogel remarking that the hydrogels possess innate structure [115, 116]. It was observed that the storage modulus of all concentrations of CMC hydrogels increases with increasing frequency, which portrays the 3D polymeric network of …
يتعلم أكثرRheology of thermo-gelling capillary suspensions
Rheological measurements were performed to examine the behavior of thermally responsive capillary suspensions. These capillary suspensions were prepared by dispersing laponite nanoparticles in a continuous oil phase and an immiscible secondary fluid consisting of an aqueous solution of a thermogelling polymer, Pluronic F127 …
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