ABSTRACT The phenomenon of desertification has a negative impact on the national economy any country and may usually be obtained for many reasons such as removal agricultural land, depletion soil, overgrazing, methods poor irrigation, high temperature, lack rainfall. following paper tackles solving problem rainfall through use chemical preparing sodium polyacrylate improving its properties by m...

During the past decade submicron and nanoparticles have aroused a wide interest and gained new applications due to their high surface area and strength. Grinding with a wet stirred media mill is usually the last process step before the submicron or nanoparticles are added to an application, and the step where the final particle size distribution is achieved. Since stirred media milling is an en...

Physical entrapment was used as an approach to achieve thermal stabilization of enzymes. The t 1/2 values for the thermoinactivation of glucose oxidase and glucoamylase were increased several-fold by their entrapment in polyacrylamide gels. In polyacrylate gels the individual enzymes behaved differently, probably owing to microenvironmental effects arising by the polyelectrolyte nature of the c...

The incoherent quasi elastic cold neutron scattering data of the side chain dynamics of the backbone deuterated linear polymer polyacrylate of Benguigui et al. (J. Phys. II France 1 (1991) 451), have been successfully interpreted in the isotropic, smectic A and re-entrant nernatic

Reduction of Cu(II) cations immobilized as cross-linkers in polyacrylate network colloids produce relatively small (~3 nm) Cu metal particles which are further tuned to smaller size (~1.5 nm) by partially substituting Ca(+2) for Cu(+2) in the polymer network colloid.

The rheological properties of a zinc phosphate and a zinc polyacrylate cement were investigated using a rotational viscometer. The effects of time, temperature, shear rate, and spindle geometry on the measured viscosities were evaluated. Results indicated that both cements exhibited Newtonian behavior.