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硅酸钠和PAM对纳米SiO_2分散性能的影响 认领 引用 被引量:1
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作者 王毅 牛永效 +1 位作者 王恩德 付建飞 《东北大学学报(自然科学版)》 EI CAS 北大核心 2007年第5期680-682,695,共3页
选择九水合硅酸钠和聚丙烯酰胺(PAM)作为分散剂,通过激光粒度分析仪对纳米颗粒的分散稳定性进行评价,红外光谱仪对分散剂在颗粒表面的吸附状态进行识别.发现九水合硅酸钠和聚丙烯酰胺结合起来使用可以发挥协同效应,从而显著改善纳米SiO... 选择九水合硅酸钠和聚丙烯酰胺(PAM)作为分散剂,通过激光粒度分析仪对纳米颗粒的分散稳定性进行评价,红外光谱仪对分散剂在颗粒表面的吸附状态进行识别.发现九水合硅酸钠和聚丙烯酰胺结合起来使用可以发挥协同效应,从而显著改善纳米SiO2颗粒在水溶液中的分散稳定性,而且当九水合硅酸钠和聚丙烯酰胺这两种分散剂的添加量相同时,先添加九水合硅酸钠后添加聚丙烯酰胺,与先添加聚丙烯酰胺后添加九水合硅酸钠相比,纳米颗粒的分散稳定性有所提高. 展开更多
关键词 纳米SiO2 分散性 稳定性 九水合硅酸钠 聚丙烯酰胺
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Preparation of polyacrylamide/silica composite capsules by inverse Pickering emulsion polymerization 认领 引用 被引量:6
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作者 Kui Zhang Qian Wang +3 位作者 Hong Meng Mian Wang Wei Wu Jianfeng Chen 《Particuology》 SCIE EI CAS CSCD 2014年第3期12-18,共7页
Polyacrylamide/silica (PAM/SiO2) composite capsules were synthesized by inverse Pickering emulsion polymerization. Silica nanoparticles modified with methacryloxypropyltrimethoxysilane (MPS) were used as a stabili... Polyacrylamide/silica (PAM/SiO2) composite capsules were synthesized by inverse Pickering emulsion polymerization. Silica nanoparticles modified with methacryloxypropyltrimethoxysilane (MPS) were used as a stabilizer. Transmission electron microscopy (TEM), scanning electron microscopy (SEM). Fourier transform infrared (FTIR) spectroscopy, and thermal gravimetric analysis (TGA) were used to characterize the morphology and composition of the composite capsules. SEM and TEM images showed that capsules consisted of a particle shell and a polymer inner layer. The capsule size depends on the nanoparticle concentration in the continuous phase. The composite rigidity largely depends on the acrylamide concentration. FTIR and TGA results indicated the existence of polyacrylamide and SiO2 in the composite particles. Aqueous Hg(ll) removal testing by the PAM/SiO2 composite capsules indicated promising potential for removing heavy metal ions from wastewater. 展开更多
关键词 PAM/SiO2 composite capsule Inverse Picketing emulsion polymerization Mercury ion Adsorption
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