Carbon-based films were synthesized by self-assembly of chitosan-encapsulated carbon microsphere （CMS@CS） composite. First, carbon microspheres （CMSs） prepared by chemical vapor deposition were modified by HNO3 an...Carbon-based films were synthesized by self-assembly of chitosan-encapsulated carbon microsphere （CMS@CS） composite. First, carbon microspheres （CMSs） prepared by chemical vapor deposition were modified by HNO3 and H2O2. Second, oxidized CMSs were modified by chitosan （CS）. Finally, CMS@CS was self-assembled by vertical deposition, in which suspension concentration and deposition temperature on the quality of self-assembling film were investigated. Field emission scanning electron microscopy, atomic force microscopy, X-ray diffraction, thermogravimetry, and Fourier transformation infrared spectrometry were employed to characterize the morphology and structure of the samples. The results show that CMSs modified by CS had uniform particle size and good dispersion, CMS@CS was self-assembled into a dense film, the film thickened with increasing suspension concentration at fixed temperature, and more ordered film was obtained at 1 wt% of suspension concentration and 50 ℃. The ultraviolet-visible absorption spectra show that the absorbance of CMS@CS film grew steadily with increasing suspension concentration and that the CMSs with oxygen-containing groups have a good assembling performance to form composite films with CS.展开更多
以粒径为340±10 nm的单分散聚苯乙烯微球为原料,采用垂直沉积法制备了蓝色聚苯乙烯胶体晶体膜。通过研究不同组装容积对聚苯乙烯胶体晶体膜的微观形貌和宏观呈色性能的影响规律,探索制备大面积蓝色聚苯乙烯胶体晶体膜的方法。结果...以粒径为340±10 nm的单分散聚苯乙烯微球为原料,采用垂直沉积法制备了蓝色聚苯乙烯胶体晶体膜。通过研究不同组装容积对聚苯乙烯胶体晶体膜的微观形貌和宏观呈色性能的影响规律,探索制备大面积蓝色聚苯乙烯胶体晶体膜的方法。结果表明,当聚苯乙烯乳液浓度为0.1wt%,干燥温度为40℃,自组装容积为50 m L时,所得聚苯乙烯胶体晶体膜呈现高质量的密排六方结构,宏观上呈现均匀明亮的蓝色,该蓝色具有一定的角度依赖性。研究发现,采用该方法制备聚苯乙烯胶体晶体膜时,在基片上和玻璃器皿壁上同时进行着垂直自组装。同时,在玻璃器皿底部也进行着蒸发自组装,形成了较大面积的蓝色聚苯乙烯胶体晶体膜,有望为制备大面积聚苯乙烯胶体晶体膜提供新的方法。展开更多
基金Funded by Program for Changjiang Scholar and Innovative Research Team in University (No.IRT0972)National Natural Science Foundation of China (Nos.20971094, 21176169, 51152001, and 51002102)+2 种基金 Natural Science Foundation of Shanxi Province (No.2009011012-4)PhD Programs Foundation of Ministry of Education of China (No.20101402110007)International S&T Co-operation Program of Shanxi Province(No.2010081017)
文摘Carbon-based films were synthesized by self-assembly of chitosan-encapsulated carbon microsphere （CMS@CS） composite. First, carbon microspheres （CMSs） prepared by chemical vapor deposition were modified by HNO3 and H2O2. Second, oxidized CMSs were modified by chitosan （CS）. Finally, CMS@CS was self-assembled by vertical deposition, in which suspension concentration and deposition temperature on the quality of self-assembling film were investigated. Field emission scanning electron microscopy, atomic force microscopy, X-ray diffraction, thermogravimetry, and Fourier transformation infrared spectrometry were employed to characterize the morphology and structure of the samples. The results show that CMSs modified by CS had uniform particle size and good dispersion, CMS@CS was self-assembled into a dense film, the film thickened with increasing suspension concentration at fixed temperature, and more ordered film was obtained at 1 wt% of suspension concentration and 50 ℃. The ultraviolet-visible absorption spectra show that the absorbance of CMS@CS film grew steadily with increasing suspension concentration and that the CMSs with oxygen-containing groups have a good assembling performance to form composite films with CS.
文摘以粒径为340±10 nm的单分散聚苯乙烯微球为原料,采用垂直沉积法制备了蓝色聚苯乙烯胶体晶体膜。通过研究不同组装容积对聚苯乙烯胶体晶体膜的微观形貌和宏观呈色性能的影响规律,探索制备大面积蓝色聚苯乙烯胶体晶体膜的方法。结果表明,当聚苯乙烯乳液浓度为0.1wt%,干燥温度为40℃,自组装容积为50 m L时,所得聚苯乙烯胶体晶体膜呈现高质量的密排六方结构,宏观上呈现均匀明亮的蓝色,该蓝色具有一定的角度依赖性。研究发现,采用该方法制备聚苯乙烯胶体晶体膜时,在基片上和玻璃器皿壁上同时进行着垂直自组装。同时,在玻璃器皿底部也进行着蒸发自组装,形成了较大面积的蓝色聚苯乙烯胶体晶体膜,有望为制备大面积聚苯乙烯胶体晶体膜提供新的方法。
