The crossover point (G ′ = G ′ ′) quantifies the balance between storage and loss modulus. This point is also called as gel point which represents the transition from liquid-like to solid-like behaviour during gelation process
Read MoreThe hydrogels prepared by visible-light-triggered polymerization possessed remarkable mechanical properties (e.g., Gel-0.5, tensile strength of 0.66 MPa, strain of 550%, and elastic modulus of 0.106 MPa).However, Gel-0.5, as well as many reported hydrogels, 26,27 showed a lower elastic modulus as compared to some synthetic
Read MoreThe aging time of the samples ranged from 1 to 7 d. The gel samples'' apparent viscosity, storage modulus G′, and loss modulus G″ were tested using a HAAKE Mars 60 rheometer. The gel strengths of gels aged at high temperature over various times were compared and analyzed to evaluate the stability of the gel system at high
Read MoreThe temperature dependence of the elastic modulus of alginate gels at elevated temperatures was first demonstrated in . This study investigates the influence of temperature on the storage and loss moduli of alginate organohydrogels at negative temperatures down to −50 °C. The objective of this study is twofold.
Read MoreSolid-like gels are characterized by the absence of an equilibrium modulus, by a storage modulus, G′(ω), which exhibits a pronounced plateau extending to times at least of the
Read MoreStorage modulus (G′) strongly depends upon the interactions and cross-links between protein molecules in the gel structure. Low-temperature defatted soy flakes were supplied by Shandong Gushen Industrial and
Read Moreand initiators. Then, after the PAAm gels were dried at 70 C in an oven for 2 days, their weight (W dried gel) was their storage modulus (G′) decreased, and the loss modulus (G″) increased
Read Morestorage modulus G'' loss modulus G" Acquire data at constant frequency, increasing stress/strain . Typical We can then get the generalized complex modulus, by analytically extending: i.e. 2‐point vs 1‐point
Read MoreDownload scientific diagram | Temperature dependence of the storage modulus G′ and the loss modulus G″ of PAN solution. from publication: Research on the mechanism of gel accelerator on gel
Read MoreNamely, the lower critical solution temperature (LCST) of PEG chains in the buffer leads to more expanded chains on cooling and, accordingly, an extra softening
Read MoreIn addition, due to the increase of temperature, the stiffness of the formed gel decreases, and the sample S2 exhibits viscoelasticity. When the temperature rises to 90 °C, the rheological curve demonstrates a different trend. Temperature dependence of storage modulus and loss modulus of S2. 3.6. Heat transfer performance.
Read MoreTo vary the gel strength, different polymer concentrations were used, while keeping the temperature, salinity, and crosslinker concentration constant. Both the loss and storage moduli increased with the polymer concentration for this gel system. The storage modulus at the end of the gelation was used to characterize the gel strength.
Read MoreIts storage modulus indicates the ability of hydrogels to store deformation energy in an elastic manner. As temperature increases, shear modulus increases significantly. At higher temperatures up to 200°C, limits are met and graphs for storage modulus become noisier when gel systems reach temperature limitations (Fig. 1).
Read MoreNetwork structures, particle size and shape affect the rheological and tribological behavior. Fluid gels provide unique properties of friction, viscosity and viscoelastic behavior. Agarose, a strongly gelling polysaccharide, is a common ingredient used to optimize the viscoelastic properties of a multitude of food products.
Read MoreStorage modulus (G '') and loss modulus (G ") of HC-MCC obtained from multiwave test over a temperature ranged from 5 to 35 °C with heating rate of 1 °C/min and by applying 1, 6, 48 rad/s frequencies simultaneously. The total accumulated strain was maintained at 1.22% within the LVR limit of the sample.
Read MoreThe changes in storage/elastic (G′) and loss/viscous (G″) modulus for a temperature profile from 37 °C to 0 °C back at a constant strain (γ = 3%) for both gelatine concentrations (Gel-5% and Gel-10 %) and different heating and cooling speeds (5, 12, 24 and 42 °C/min) are shown in Fig. 5. It shows clearly that gelatine displayed liquid
Read MoreThe network becomes destroyed as the temperature rises above the gel temperature, resulting in poor thermal and low mechanical properties (Cui et al., 2022). Moreover, The storage modulus of P26G4 was increased by 205% from 1 × 3 kGy to 5 × 3 kGy. Open in a separate window.
Read MoreThe results of temperature–time dependence studies of rigidity moduli (G 1) and loss moduli (G 2) of 0.1 (g/cm 3) wheat starch gels are presented in Fig. 3, Fig. 4, respectively.Wheat gel samples exhibited an initial rapid rise both of rigidity moduli (G 1) and loss moduli (G 2) followed by a phase of much slower increase at longer times.
Read MoreAdditionally, the gel performances, such as the T gel, the gel modulus, and the gel maintenance in vivo and in vitro could be conveniently tailored by just regulating the blending ratio. Similarly, blending PCLA-PEG-PCLA triblock copolymers and their fully hexanoyl-capped derivatives with rational ratios formed temperature-responsive gelling
Read MoreIt can be seen that the storage modulus (G′) decreases with increasing temperature, suggesting that the oleogels exhibit a decrease in gel strength as temperature increases. The storage modulus represents the "solid like" component of the viscoelastic properties of gels, and therefore can be correlated to the hardness of the gel
Read MoreStorage modulus (G '') and loss modulus (G ") of HC-MCC obtained from multiwave test over a temperature ranged from 5 to 35 °C with heating rate of 1 °C/min
Read MoreRevealing a temperature-weakening effect on the modulus of a MRE, Masoud et al found that both the storage and the loss modulus of a MRE decrease with
Read MoreStorage modulus G′ and loss modulus G″ are closely related to the elasticity and viscosity of surimi gel, respectively. The dynamic modulus (G′ and G″) of surimi show the great dependence on temperature, as shown in Fig. 4 C and D.
Read MoreIn all cases, 1 mL of collagen solution is neutralized and then applied to the measuring stage at 4°C. The solvent trap is added, and the measurement begins when the tool reaches the desired temperature. Storage modulus, G′ (Pa), and loss modulus, G″ (Pa), are monitored as the gel forms until plateaus are reached. Moduli are determined
Read MoreEffect of the cross-linker content on the storage modulus (G′) (a), loss modulus (G″) (b), and loss factor (tanδ) (c) of the as-prepared PAAm hydrogels prepared at an AAm concentration of 2.5
Read MoreThe temperature sensitive behavior of the hydrogels is demonstrated by a temperature sweep that showed all hydrogels exhibiting increasing complex viscosity
Read MoreThe storage modulus G′ characterizes the elastic and the loss modulus G″ the viscous part of the viscoelastic behavior. of the hydrogel. The higher the G′ value the stronger the gel. (G″) are plotted versus shear strain. The oscillating frequency was 0.1 Hz at room temperature [25 °C; monomer concentration = 2 mol/L; MBAA = 2
Read MoreSome of the temperature scans of the Na-alginate gels are given in Fig. 6. The temperature coefficient of the storage modulus (dG''/dT) was calculated using linear regression. The data have been fitted to a simple first-order propor- tionality. The temperature coefficient of the Na- alginate gels versus their storage modulus is given
Read MoreAfter it had reached the gel point, which was defined by the crossover of the storage and loss modulus during an isothermal cure (ASTM D4473 or criterion 1 as described in Section 3.1), the temperature of each BA-a/Ph-a resin mixture was immediately lowered and equilibrated at 120 °C to suppress further cross-linking reaction while still
Read MoreThe tensile storage modulus reaches 590 MPa at 25 °C and drops only slightly to 290 MPa when heated to 150 °C. The loss modulus is lower than the storage
Read MoreThe functionality f is the number of strands linked to a cross-linker. The density î e is related to the density of effective junctions n e (in mol m-3) using the following equality:21 From eqs 2 and 3, the elastic modulus is expected to be proportional to n e at constant temperature, but as well as proportional to T at constant n e.
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