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Preparation of Hollow Silica Microspheres via Poly(N-isopropylacrylamide) 认领 引用 被引量：2
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作者 汪谟贞 陈宇晨 +1 位作者 葛学平 葛学武 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2012年第1期120-124,I0004,共5页
Core-shell structured SiO2/poly（N-isopropylacrylamide） （SiO2/PNIPAM） microspheres were successfully fabricated through hydrolysis and condensation reaction of tertraethyl orthosilicate （TEOS） on the surface of P... Core-shell structured SiO2/poly（N-isopropylacrylamide） （SiO2/PNIPAM） microspheres were successfully fabricated through hydrolysis and condensation reaction of tertraethyl orthosilicate （TEOS） on the surface of PNIPAM template at 50 ~C. 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. 展开更多
关键词 SiO2 hollow microsphere Poly（N-isopropylacrylamide） Tertraethyl orthosilicate Soft template
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Controlling coffee ring structure on hydrophobic polymer surface by manipulating wettability with O2 plasma 认领 引用
2
作者 Li-Ying Cui Yu Yan +3 位作者 Xin-Yu Zhao Cun-Long Yu Ying Ma Bai Yang 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第1期1-5,共5页
A simple and novel method is firstly reported for controlling coffee ring structure on polystyrene（PS）film surface by O2 plasma. O2 plasma treatment leads to the wettability change of PS surface from hydrophobic to ... A simple and novel method is firstly reported for controlling coffee ring structure on polystyrene（PS）film surface by O2 plasma. O2 plasma treatment leads to the wettability change of PS surface from hydrophobic to hydrophilic. For hydrophilic PS surface the coffee ring structure is avoided relying on the motion of contact line（CL） while SiO2 microspheres are left. The motion of the CL is produced based on the viscosity and Marangoni effect with the addition of polymer additives. For hydrophobic PS surface coffee ring structure still persists even with polymer additives because SiO2 microspheres transfer with the motion of the CL at the beginning of droplet evaporation and accumulate at the droplet edge at late stage with the pinning of the CL. As a result, uniform and macroscale SiO2 microspheres deposition without coffee ring structure and SiO2 microspheres deposition with coffee ring structure are controlled by O2 plasma. This method provides a new way to tune coffee ring structure with smart surface and may be potentially useful for a range of application at material deposition and diagnosing diseases. 展开更多
关键词 Coffee ring SiO2 microspheres deposition Drop evaporation O2 plasma PS surface
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Preparation of SiO2microspheres with sodium ions and self-assembly of photonic crystals 认领 引用 被引量：2
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作者 LIU LiYing WANG XiuFeng +1 位作者 ZHANG ChunXiang CHENG Bing 《Chinese Science Bulletin》 2010年第8期766-770,共5页
SiO2 microspheres were prepared via a novel co-precipitation process.The Na+ions were introduced by adding sodium chloride and metal sodium in solution systems for improving surface charge of the SiO2 microspheres.And... SiO2 microspheres were prepared via a novel co-precipitation process.The Na+ions were introduced by adding sodium chloride and metal sodium in solution systems for improving surface charge of the SiO2 microspheres.And then SiO2 photonic crystals were fabricated by the vertical deposition method.The electrical properties,micromorphology and optical properties were characterized by zeta potential instrument,scanning electron microscope(SEM)with energy dispersive X-ray spectroscopy and Uv-Vis-Nir spectrophotometer.Zeta potential of the SiO2 microspheres modified by sodium chloride and metal sodium were averagely heightened 11.39 mV and 13.52 mV respectively in ethanol solution.EDS spectra showed that there was Na element in the SiO2 microspheres.SEM images showed that the average size of the SiO2 microspheres modified by sodium chloride and metal sodium were 380 nm and 354 nm respectively,larger than that of the unmodified ones,and their distribution standard deviation was less than 5%,and the sample of SiO2 photonic crystals was face-centered cubic structure with their(111)planes parallel to the substrate.In addition,absorption spectra showed that photonic band gap of the SiO2 photonic crystals was modified by sodium chloride and metal sodium located in 856 nm and 798 nm respectively.Meanwhile,their absorption peaks became narrower and higher and exhibited a red-shift phenomenon. 展开更多
关键词 photonic crystals SiO2 microspheres self-assembly modification
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