One-Step Hydrophobic Silica Nanoparticle Synthesis at the Air/Water Interface
One-Step Hydrophobic Silica Nanoparticle Synthesis at the Air/Water Interface
复制标题
在空气/水界面一步合成疏水性二氧化硅纳米粒子
DOI：
10.1021/acssuschemeng.8b06359
复制
发表时间：
2019
影响因子：
8.4
通讯作者：
Britt, David W.
中科院分区：
文献类型：
--
作者：
Giasuddin, Abul Bashar;Cartwright, Anthony;Jackson, Kyle;Britt, David W.
提出了一种无模板、单一前驱体的方法，用于在朗缪尔槽中制备疏水性二氧化硅纳米颗粒(NPs)，该纳米颗粒由弱酸性亚相连接成两个孤立的界面。在一个界面上具有正丙基侧基(NPM)的水不溶的三甲氧基硅烷在水解时被溶解，并通过亚相扩散到清洁的空气/水界面，在那里用金属丝探头张力计测量界面的溶胶-凝胶反应。水解NPM在空气/水界面的吸附和组装反映在表面压力的稳定增加和平台上。通过傅立叶变换红外光谱、X射线衍射仪、扫描电子显微镜、原子力显微镜和水接触角对转移膜进行表征，证实了水解物在空气/水界面上自组装成∼1 nm薄膜，再经缩聚形成亚10 nm的“种子”粒子，再组装成无定形的∼150 nm疏水纳米粒子。通过Langmuir-Schaefer方法转移的薄膜产生适度疏水的表面(水接触角为115°)，而作为多层涂层沉积的吸气薄膜得到接触角大于165°的超疏水表面。BET比表面积分析表明无孔颗粒。较长的烷基链有机硅烷(直到C8)也通过这种方法形成NPs，但疏水性并不比C3NPM硅烷大。这种方法提供了一种在纯水条件下使用单一短链烷基硅烷前驱体制备疏水有机硅烷粒子的简便方法。
A template-free, single-precursor method is presented for constructing hydrophobic silica nanoparticles (NPs) without organic solvent in a Langmuir trough divided into two isolated interfaces connected by a mildly acidic subphase. A water-insoluble trimethoxysilane with an n-propyl side group (nPM) spread at one interface is solubilized upon hydrolysis and diffuses through the subphase to the clean air/water interface where a wire probe tensiometer measures the interfacial sol–gel reaction. Adsorption and assembly of hydrolyzed nPM at the air/water interface is reflected by a steady increase in surface pressure followed by a plateau. Transferred films characterized with FTIR, XRD, SEM, AFM, and water contact angle confirm self-assembly of hydrolyzed nPM into an ∼1 nm thin film at the air/water interface that undergoes polycondensation into sub-10 nm “seed” particles, which further assemble into amorphous, ∼150 nm hydrophobic NPs. Films transferred through the Langmuir–Schaefer method yield modestly hydrophobic surfaces (water contact angles of 115°), whereas aspirated films deposited as a multilayer coating yield superhydrophobic surfaces with contact angles greater than 165°. BET surface area analysis indicates nonporous particles. Longer alkyl-chain organo-silanes (up to C8) also form NPs through this method but with no greater hydrophobicity than the C3 nPM silane. This method provides a facile approach to prepare hydrophobic organo-silane particles using a single short-chain alkyl-silane precursor under purely aqueous conditions.
纤维素离子液体膜中植物过氧化物酶的固定化
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
S. V. Muginova;D. Myasnikova;Aleksei E. Polyakov;T. Shekhovtsova
通讯作者：
T. Shekhovtsova
磷脂朗缪尔膜作为空气/水界面处原位二氧化硅纳米颗粒形成的模板
DOI：
10.1021/la903525u
发表时间：
2009
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Pfefferkorn;Binder;Kressler
通讯作者：
Kressler
溶胶-凝胶动力学 II：化学形态模型。
DOI：
--
发表时间：
1988
期刊：
影响因子：
--
作者：
B. D. Kay;R. Assink
通讯作者：
R. Assink