从蛋黄-蛋壳到Janus介孔有机硅纳米结构的转变
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- 英文论文题名：Mesoporous Organosilica Nanostructures Transformation from Yolk-shell to Janus
- 论文作者：王雪 ; 何亚鹏 ; 马亚丽 ; 刘云凌 ; 霍启升 ; 乔振安
- 英文论文作者：Xue Wang ; Yapeng He ; Yali Ma ; Yunling Liu ; Qisheng Huo ; Zhenan Qiao ; State Key Laboratory of Inorganic Synthesis and Preparative Chemistry ; College of Chemistry ; Jilin University
- 年：2016
- 作者机构：吉林大学化学学院无机合成与制备化学国家重点实验室;
- 论文关键词：介孔有机硅纳米结构 ; 蛋黄-蛋壳 ; Janus ; 转变
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十六分会：纳米材料合成与组装
- 语种：中文
- 分类号：TB383.1;O627.41
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十六分会 ; 纳米材料合成与组装
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：247k
- 原文格式：D
- 会议级别：全国
摘要
介孔有机硅纳米材料由于其高稳定性、独特的有机无机复合的组成均匀地分布在整个骨架以及易于修饰的内外表面,逐渐受到了人们的广泛关注~[1]。然而在传统的介孔有机硅纳米材料的合成方法中,研究者们通常得到的是具有单一形貌、孔结构的介孔有机硅纳米粒子~[1-4]。制备具有不同形貌的介孔有机硅纳米粒子逐渐成为了研究的热点。本文利用对称/非对称包覆的方法成功制备了各向异性的介孔有机硅纳米粒子。通过简单的改变反应体系中氨水的浓度,实现了介孔有机硅纳米粒子从蛋黄-蛋壳到Janus结构的转变。在整个反应过程中,氨水首先作为碱性催化剂促进有机硅前驱体的水解和聚合;其次氨水作为刻蚀剂,将实心的二氧化硅球逐渐地刻蚀,使得在原来二氧化硅球的位置上形成了空腔。
We describe a facile and controllable asymmetrical/symmetrical coating strategy for the preparation of various novel periodic mesoporous organosilicas(PMO) nanostructures, including Au&PMO Janus and Au@PMO yolk-shell nanoparticles, by using Au@SiO_2 nanoparticles as seeds. By simply tuning the concentration of ammonia(NH_3H_2O) in reaction system, we successfully achieve the PMO nanostructure transformation from core-shell to Janus. During the process, the ammonia first plays as a basic catalyst facilitating the hydrolyzation and condensation of organosilica precursor, and additionally as an etching agent selectively in-situ dissolving SiO_2 shells of Au@SiO_2 nanoparticles to form these unique nanostructures.
We describe a facile and controllable asymmetrical/symmetrical coating strategy for the preparation of various novel periodic mesoporous organosilicas(PMO) nanostructures, including Au&PMO Janus and Au@PMO yolk-shell nanoparticles, by using Au@SiO_2 nanoparticles as seeds. By simply tuning the concentration of ammonia(NH_3H_2O) in reaction system, we successfully achieve the PMO nanostructure transformation from core-shell to Janus. During the process, the ammonia first plays as a basic catalyst facilitating the hydrolyzation and condensation of organosilica precursor, and additionally as an etching agent selectively in-situ dissolving SiO_2 shells of Au@SiO_2 nanoparticles to form these unique nanostructures.
引文
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[2]Chen,D.Li,L.L.Tang,F.Q.Qi,S.O.Adv.Mater.2009,21:3804.
[3]Yang,Y.Liu,J.Li,X.Liu,X.Yang,Q.Chem.Mater.2011,23:3676.
[4]Zou,H.Wang,R.Li,X.Wang,X.Zeng,S.Ding,S.Li,L.Zhang,Z.Qiu,S.J.Mater.Chem.A 2014,2:12403.