نتایج جستجو برای ' Polyacrylamide '

Polymer flooding has proved economically and technically successful in numerous enhanced oil recovery projects, which can improve oil recovery of mature reservoirs. Although, polymer solutions are used as mobility control agents in different chemical enhanced oil recovery methods, they are influenced by several degradation factors. Therefore, the improvement of the polymer solution properties is significant for polymer-based enhanced oil recovery methods. In addition, modification of the rheolog...

 Adsorption of Cr (VI) from aqueous solution was studied using a continuous fixed bed column which is packed with a new micro-porous composite particle developed in this study. This composite particle is composed of silica porous particle in which acrylamide is polymerized within the pore regions of the silica particles. The composite particle was supposed to maintain the mechanical properties of polyacrylamide as efficient absorbent to serve appropriately in the continuous processes. In or...

 l-Asparaginase has potential as an anti-cancer drug and for prevention of acrylamide formation in fried and baked foods. Production of the enzyme by Bacillus licheniformis(RAM-8) was optimized by process engineering using a statistical modeling approach and a maximum yield of 32.26 IU/ml was achieved. The l-asparaginase exhibited glutaminase activity of only 0.8 IU/ml and would therefore be less prone to cause the side effects associated with asparaginase therapy compar...

 We report here the synthesis of TbMnO3 nanoparticles via an acrylamide gel route. XRD, TG analysis, DSC analysis, and FTIR spectroscopy are combinatively used to investigate the thermal decomposition process of precursor xerogels and the formation of TbMnO3 phase. It is demonstrated that high-phase-purity TbMnO3 nanoparticles can be prepared by using different chelating agents at a sintering temperature of 800 °C. SEM observation and XRD analysis reveal that the par...

 This study investigates polyacrylamide (PA) gel as a calibration material to measure the nanomechanical compressive modulus of cartilage using nanoindentation. Both nanoindentation and unconfined compression testing were performed on PA gel and porcine rib cartilage. The equilibrium moduli measured by the two methods were discernable. Nanoindentation has the advantage of distinguishing between spatially dependent constituent properties that affect tissue mechanical function in heterogeneou...

 We describe the preparation and characteristics of cationic polyacrylamide/silica (CPAAm/ASNP) nanocomposites for papermaking. The nanocomposites were successfully prepared by in situ inverse emulsion copolymerizations of acrylamide and [2-(acryloyloxy)ethyl]-trimethylammonium chloride (AOTAC) in the presence of acryl-grafted silica nanoparticles (ASNPs). The ASNPs were synthesized through the reaction of fumed silica and (3-acryloxypropyl) trimethoxysilane (APTMS) in toluene, wh...

  This study investigates the effect of two alkali metal cations (Li+, K+) on the adsorption of high-molecularweight, nonionic polyacrylamide on glass surfaces using a colloidal force probe. The effect of two different anions (Cl−, NO3 −) on polymer adsorption is also presented. There is a general consensus that hydrogen bonding is the main mechanism by which nonionic polyacrylamides adsorb to silica and glass surfaces. In the current study, the adsorption of the polym...

 Nanoparticle with higher aspect ratio and greater surface area renders higher micro-bridging ability in flocculating paper furnishes adsorbed with cationic polymers. Sodium titanate nanobelt is a typical one-dimensional nano-material with extremely high aspect ratios. In this paper, the nanobelt was synthesized hydrothermally and successfully peeled with tetramethylammonium hydroxide (TMAOH). The peeled nanobelt was characterized by XRD, TEM, BET surface area and surface charge measurement...

 This study examines and quantifies the effect of cationic polyacrylamide (CPAM) dissolution kinetics and charge density on the adsorption and aggregation state of gold nanoparticles (AuNPs) on paper and the resulting Surface Enhanced Raman Scattering (SERS) performance. Dissolution kinetics of CPAM of different charge density was studied by monitoring their viscosity and hydrodynamic diameter over regular intervals of time. It was found that the degree of dissolution of CPAM greatly affect...