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Preparation of Hollow Silica Microspheres via Poly(N-isopropylacrylamide)
Mo-zhen Wang*,Yu-chen Chen,Xue-ping Ge,Xue-wu Ge
Author NameAffiliationE-mail
Mo-zhen Wang* CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China pstwmz@ustc.edu.cn 
Yu-chen Chen CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Xue-ping Ge Institute of Nuclear Technology and Application, School of Science, East China University of Science and Technology, Shanghai 200237, China  
Xue-wu Ge CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Abstract:
Core-shell structured SiO2/poly(N-isopropylacrylamide) (SiO2/PNIPAM) microspheres were successfully fabricated through hydrolysis and condensation reaction of tertraethyl or-thosilicate (TEOS) on the surface of PNIPAM template at 50 oC. The PNIPAM template can be easily removed by water at room temperature so that SiO2 hollow microspheres were finally obtained. The transmission electron microscope and scanning electron microscope observations indicated that SiO2 hollow microspheres with an average diameter of 150 nm can be formed only if there are enough concentration of PNIPAM and TEOS, and the hy-drolysis time of TEOS. FTIR analysis showed that part of PNIPAM remained on the wall of SiO2 because of the strong interaction between PNIPAM and silica. This work provides a clean and efficient way to prepare hollow microspheres.
Key words:  SiO2 hollow microsphere, Poly(N-isopropylacrylamide), Tertraethyl orthosili-cate, Soft template
FundProject:
聚(N-异丙基丙烯酰胺)模板法制备二氧化硅中空微球
汪谟贞*,陈宇晨,葛学平,葛学武
摘要:
以在50 oC水溶液中析出的聚(N-异丙基丙烯酰胺) (PNI-PAM)聚集体作为软模板,使正硅酸乙酯吸附在PNIPAM聚集体表面进行水解缩合,原位生成二氧化硅包裹PNIPAM的核壳结构微球;进一步冷却至室温使PNIPAM溶解在水中除去内核,从而成功合成出SiO2中空微球.实验表明,只有在足够的PNIPAM和正硅酸乙酯含量以及正硅酸乙酯水解时间下,才能形成稳定的SiO2中空微球.用TEM、SEM和FTIR对合成的SiO2中空微球进行了表征,结果表明,微球尺寸为150 nm左右,并且由于PNIPAM上酰胺基团和正硅酸乙酯水解出来的硅醇间具有静电相互作用,使得SiO2壳层上依然有PNIPAM残留.
关键词:  SiO2中空微球,聚(N-异丙基丙烯酰胺),正硅酸乙酯,软模板
DOI:10.1088/1674-0068/25/01/120-124
分类号: