The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e ...The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e were identified.The hydroxyl ligand number and aging time are determinate fac tors for the forming of Al 13 .The nice tetrahedral sulfate was characterized by XRD and SEM,and the mol ecular formula was inferred to be[NaAlO 4 Al 12 (OH) 24 (H 2 O) 12 ](SO 4 ) 4 .This crystal was used as standard matter for preparation of polynuclear Al species(Al 13 ).The purity,stability and storage condition of the polynuclear Al 13 solution were explored.展开更多
以N aC l晶体为致孔剂,合成了具有pH及温度双重敏感特性的海藻酸钠接枝甲基丙烯酸梳状多孔水凝胶。利用扫描电镜观察到该水凝胶具有特殊的孔洞结构,孔径大小为100μm左右。不同pH值及温度下的溶胀和溶胀-收缩动力学研究表明,该水凝胶具...以N aC l晶体为致孔剂,合成了具有pH及温度双重敏感特性的海藻酸钠接枝甲基丙烯酸梳状多孔水凝胶。利用扫描电镜观察到该水凝胶具有特殊的孔洞结构,孔径大小为100μm左右。不同pH值及温度下的溶胀和溶胀-收缩动力学研究表明,该水凝胶具有较快的响应速率,在5 m in内可以达到溶胀平衡,而且溶胀收缩行为有较好的重复性。该水凝胶的最低临界溶液温度(LCST)为30℃左右。比较含孔不同的凝胶膜的响应曲线,发现含孔越多,溶胀率和凝胶体积变化量越大,溶胀收缩响应速率越快。展开更多
A Poly(alginate-acrylamide)superabsorbent was preparation from copolymer of alginate with acrylamide in inverse-suspension by microwaves.The effects of amount of alginate,initiator,cross-linker and oil/water ratio on ...A Poly(alginate-acrylamide)superabsorbent was preparation from copolymer of alginate with acrylamide in inverse-suspension by microwaves.The effects of amount of alginate,initiator,cross-linker and oil/water ratio on swelling values were investigated.The results indicate that the optimal swelling rate to distilled water and 0.9% NaCl soulution is 800g/g and 100g/g,respectively.展开更多
文摘The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e were identified.The hydroxyl ligand number and aging time are determinate fac tors for the forming of Al 13 .The nice tetrahedral sulfate was characterized by XRD and SEM,and the mol ecular formula was inferred to be[NaAlO 4 Al 12 (OH) 24 (H 2 O) 12 ](SO 4 ) 4 .This crystal was used as standard matter for preparation of polynuclear Al species(Al 13 ).The purity,stability and storage condition of the polynuclear Al 13 solution were explored.
文摘以N aC l晶体为致孔剂,合成了具有pH及温度双重敏感特性的海藻酸钠接枝甲基丙烯酸梳状多孔水凝胶。利用扫描电镜观察到该水凝胶具有特殊的孔洞结构,孔径大小为100μm左右。不同pH值及温度下的溶胀和溶胀-收缩动力学研究表明,该水凝胶具有较快的响应速率,在5 m in内可以达到溶胀平衡,而且溶胀收缩行为有较好的重复性。该水凝胶的最低临界溶液温度(LCST)为30℃左右。比较含孔不同的凝胶膜的响应曲线,发现含孔越多,溶胀率和凝胶体积变化量越大,溶胀收缩响应速率越快。
文摘A Poly(alginate-acrylamide)superabsorbent was preparation from copolymer of alginate with acrylamide in inverse-suspension by microwaves.The effects of amount of alginate,initiator,cross-linker and oil/water ratio on swelling values were investigated.The results indicate that the optimal swelling rate to distilled water and 0.9% NaCl soulution is 800g/g and 100g/g,respectively.
