Results 261 to 270 of about 6,700,477 (288)
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Scattering Properties of Dipolar Gels
Macromolecules, 2008We study the effects of dipolar interactions of polymer chains where the dipolar moments are aligned along the polymer segments on the scattering properties of dipolar gels made by randomly cross-linking dipolar chains in polar solvent. Using the field-theoretical approach, the dipolar interactions of polar solvent and dipolar polymer segments are ...
Tong, C., Vilgis, T.
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Rheological properties of casein gels
Journal of Dairy Research, 1989SummaryThe rheological properties of rennet-induced skim milk gels at 30 °C are compared with casein gels formed by acidification to pH 4·6 at 2 °C and subsequent heating to 30 °C. Both types of gels are viscoelastic. However, the gels formed by rennet action are relatively more viscous over time scales longer than 1 s. This implies that on average the
van Vliet, T. +3 more
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Rheological properties of topical fluoride gels
Dental Materials, 1989The rheological properties of several commercial topical fluoride gels were studied. For that purpose, we investigated hysteresis loops under standard conditions, equilibrium values, apparent viscosities as a function of shear rate, rate of thixotropic recovery, and the influence of temperature.
Vercammen, Jacqueline +3 more
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The rheological properties of carbopol gels II. Oscillatory properties of carbopol gels
International Journal of Pharmaceutics, 1979Abstract Viscoelastic properties of aqueous Carbopol gels were examined at frequencies of 7.91 × 10 −3 to 25 Hz using a Weissenberg rheogoniometer. Neutralized gels changed little from 10 to 50dgC and were similar to unneutralized gels. Data confirmed the dominant elastic nature of Carbopol gels (phase lags of 2–14°) and the relative small change of
B.W. Barry, M.C. Meyer
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Fracture properties of starch gels
1992Abstract Fracture properties of starch gels are, in contrast with their small deformation properties, clearly time dependent. Fracture stress and deformation at fracture increased with increasing rate of deformation. A possible explanation for this is friction between the granules during large deformations.
Luyten, H., Ramaker, M.G., van Vliet, T.
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Intelligent gel– surface properties and functions of gels–
Macromolecular Symposia, 2000The sliding friction of various kinds of hydrogels has been studied and it was found that the frictional behaviors of the hydrogels do not conform to Amonton's law F = μW, which well describes the friction of solids. The frictional force and its dependencies of on the load are quite different depending on the chemical structures of the gels, surface ...
Jian Ping Gong +2 more
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Anomalous properties of water in macromolecular gels
Biochimica et Biophysica Acta (BBA) - General Subjects, 1991Low molecular weight solutes often exhibit elution characteristics on gel filtration columns which deviate from ideal behaviour. In many previous studies this anomalous behaviour was attributed to the existence of extremely narrow pores in the gel, inaccessible even to very small solute molecules, to explain Kd values lower than unity.
J, van Steveninck +3 more
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Lignin gel with unique swelling property
Bioresource Technology, 2003Lignin gels were prepared from acetic acid lignin by use of polyethylene glycol diglycidyl ether as cross-linker. The gels were found to swell in aqueous ethanol solution, in particular 50% (v/v) solution. In addition, they also swelled in alkaline solution and shrank upon heating.
Mitsukuni, Nishida +2 more
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Measurement of the Elasto-Plastic Properties of Gels
Nature, 1949Cheftel and Mocquard1 used the deflexion of a vane embedded in a gel to record the relation between the deformation of the gel and the applied force.
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Journal of Non-Crystalline Solids, 1987
After defining the basic concepts of fractal geometry, the different methods of resolution analysis used in practice to determine fractal parameters : X-ray scattering, adsorption and electronic energy transfers are briefly presented. The results obtained for silica gels are reviewed and the difficulties of interpretation discussed.
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After defining the basic concepts of fractal geometry, the different methods of resolution analysis used in practice to determine fractal parameters : X-ray scattering, adsorption and electronic energy transfers are briefly presented. The results obtained for silica gels are reviewed and the difficulties of interpretation discussed.
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