Results 221 to 230 of about 227,845 (263)
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Electrophoresis and Gel Strength
Nature, 1954A CURIOUS phenomenon has been noted in recent work on the electrophoresis of sodium carrageenate. This polysaccharide occurs in the red seaweed, Chondrus crispus, and is composed mainly of d-galactose sulphate units linked in the 1–3 positions. Cations associated with the sulphate can become ionized to make the molecule a polyelectrolyte.
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Proceedings of SPE Oilfield and Geothermal Chemistry Symposium, 1985
ABSTRACT A simple screen extrusion rheometer (Gel Strength Tester) was designed to quantitatively compare strong bulk gels of the compositions used for conformance improvement in near-wellbore treatments. In addition, this tester should be able to measure other strong gels, such as thick drilling muds.
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ABSTRACT A simple screen extrusion rheometer (Gel Strength Tester) was designed to quantitatively compare strong bulk gels of the compositions used for conformance improvement in near-wellbore treatments. In addition, this tester should be able to measure other strong gels, such as thick drilling muds.
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Development of high-strength gel dosimeter made by 3D gel printer
Nano-, Bio-, Info-Tech Sensors, and 3D Systems II, 2017In the radiation therapy, ionization chambers and/or film dosimeters are usually used to measure dose distribution, and three-dimensional absorbed dose distribution of the human body is calculated by computer simulation. However, at the treatment site, measurements of actual three-dimensional absorbed dose distribution become more important, because ...
Shota INOUE +4 more
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Agarose gel structure using atomic force microscopy: Gel concentration and ionic strength effects
ELECTROPHORESIS, 1998AbstractAgarose gels have been studied by atomic force microscopy (AFM). The experiments were especially designed to work in aqueous conditions, allowing direct observation of the “unperturbed” gel without invasive treatment. AFM images clearly show strong dependence of pore diameter and its distribution on ionic strength of the solvent.
M, Maaloum, N, Pernodet, B, Tinland
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Elasticity, tear strength, and strength of adhesion of soft PVC gels
Journal of Applied Polymer Science, 1986AbstractAn experimental study is described of the tensile modulus E of elasticity, tear strength Gc, and strength Ga of adhesion to a Mylar substrate, for PVC gels prepared with a wide range of PVC concentrations and with four different plasticizers. The modulus E, measured under quasiequilibrium conditions, was found to be approximately proportional ...
A. N. Gent, N. Shimizu
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Polyampholytes superabsorbent nanocomposites with excellent gel strength
Composites Science and Technology, 2007A series of novel polyampholyte superabsorbent nanocomposites with excellent gel strength were synthesized by in situ solution polymerization in aqueous solution. Acrylic acid and acryloyloxyethyl trimethyl ammonium chloride (DAC) were employed as ionic monomers and montmorillonite (MMT) was used as inorganic component.
Kun Xu +7 more
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Parametric study of strength of silica gels
Journal of Non-Crystalline Solids, 1994Abstract Cylindrical gel bodies were produced by using Si(OC2H5)4, C2H5OH and H2O with various catalysts. A systematic parametric study of gel strength and microstructure as a function of C2H5OH/H2O molar ratio and catalyst concentration in sol, catalyst type as well as aging time, was conducted.
Fikret Kirkbir +4 more
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Gel strength and rate of gelation of soft polymers
Dental Materials, 1991A rheometer was used to characterize the gelation rate of six commercial short- to medium-term (chairside intra-oral gelation) denture soft-lining materials. Shear puncture force was measured from one to 60 days for six short- to medium-term materials as well as for three heat-cured (polymerizable) materials.
D W, Jones, E J, Sutow, B S, Graham
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Dynamic viscoelasticity of fibrin gels: Dependence on ionic strength
Thrombosis Research, 1976Abstract The dynamic rigidity and loss moduli of fibrinogen solutions with various ionic strengths are determined during clotting. The kinetic analysis of the clotting curves indicates that the fibrin gels formed at high and low ionic strengths consist of non-flexible thick fibrous bundles, while those formed at moderate ionic strengths consist of ...
M, Kaibara, E, Fukada
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Characterization of Crosslinked Gel Kinetics and Gel Strength by Use of NMR
SPE Reservoir Evaluation & Engineering, 2008Summary Highly crosslinked gels are used in high-permeability reservoirs to achieve appropriate fluid-loss control during well completion and workover operations. Crosslinked gels are also used to shut off unwanted gas and/or water influx into production wells and to improve the conformance of the near-wellbore injection profile in ...
L. Romero-Zerón, F. Manalo, A. Kantzas
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