Large-Area Nanoparticle Films by Continuous Automated Langmuir-Blodgett Assembly and Deposition
Large-Area Nanoparticle Films by Continuous Automated Langmuir-Blodgett Assembly and Deposition
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DOI：
10.1021/acs.langmuir.5b03760
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发表时间：
2016-02-09
期刊：
影响因子：
3.9
通讯作者：
Gilchrist, James F.
中科院分区：
文献类型：
--
作者：
Li, Xue;Gilchrist, James F.
研究了从水悬浮液中自动化Langmuir-Blodgett沉积单尺寸微米级二氧化硅胶体的操作参数和所得的足够的形态。该设备允许颗粒连续地卷对卷沉积成良好有序的阵列。在低于10 mm/s的网速度下以低至中等沉积速率进行颗粒单层的可再现沉积是可能的，并且通过从溶液沉积的颗粒的简单质量平衡来准确表征。在更快的沉积速率下，朗道-列维奇流增加膜厚度，使得流动不稳定性阻碍均匀的颗粒沉积。一个简单的相图概述了从分散到多层涂层和从均匀到不规则的沉积模式的过渡。虽然最大沉积速率的阈值对于这些条件是明确定义的，但是改变操作参数、颗粒尺寸以及流体粘度和蒸发速率，最大速度可以显著增加。
The operating parameters and resulting suffice morphology of automated Langmuir Blodgett deposition of monosized micrometer-scale silica colloids from an aqueous suspension are investigated. This apparatus allows continuous roll-to-roll deposition of particles into well-ordered arrays. The reproducible deposition of particle monolayers at low to moderate deposition rates at web speeds of less than 10 mm/s is possible and accurately characterized by a simple mass balance of particles deposited from solution. At faster deposition rates, Landau-Levich flow increases the film thickness such that flow instabilities hinder uniform particle deposition. A simple phase diagram outlines transitions from dispersed to multilayer coatings and from uniform to erratic deposition patterns. While the threshold of maximum deposition rate is well-defined for these conditions, changing operating parameters, particle size, and fluid viscosity and evaporation rate, the maximum speed can be increased significantly.