摘要随着社会的不断发展和科技的不断进步，人们对新材料合成的重视不断加强。组成单一、形貌对称的传统材料已经满足不了人类的需要，因此富集多种功能性和具有特殊结构的各向异性材料成了人们关注的焦点。其中Janus材料是一类组成和结构不对称的新型材料，在很多领域应用广泛，受到了研究人员极大的关注。当前研究的热点是探索简单高效低成本的方法制备Janus粒子。

    近年来，随着液滴微流控芯片技术的不断成熟，其在材料合成领域的应用已经越来越引起研究人员的关注。目前液滴微流控芯片技术已经用来合成单分散微球、Janus微球、中空或多核小球以及形貌可控的微球等，其制备的微球单分散性较好，具有传统的乳液法不可比拟的优势。本研究尝试利用液滴微流控法制备形态可控性高，而且单体的选择性大的Janus微液滴，并通过ITO电极加热单相液滴的方法考察液滴构型的变化过程及可逆性。本论文包括以下主要内容：68847

1) 宏观条件下，考察离子液体与水的可溶性，离子液体与水发生相分离所需的温度及相分离的效率；

2) 以离子液体与水的混合物为分散相，矿物油为连续相，形成单相液滴；

3) 在芯片通道内加工ITO电极，考察电流与芯片通道内温度升高的关系，筛选合适的工作电流；

4) 通过ITO电极加热形成的单相液滴，考察液滴构型的变化过程及可逆性。

毕业论文关键词：微流控芯片  Janus微液滴  离子液体  可逆相变

Temperature Regulated Reversible  Emulsion Configuration

Abstract    With the continuous development of society and technology, the synthesis of new materials gets more and more people's attention. The traditional materials with symmetrical shape and single composition has failed to meet human needs, and  anisotropic materials with special structure and variety of functions has become the focus of people's attention. Janus is one of new materials which have symmetrical structure and composition, it has been widely used in many areas and has became a great concern among researchers. Therefore, it is important to develop simple, efficient and low-cost method for producing Janus particles.

    In recent years, droplet microfluidics becomes a new technique in material synthesis. Monodisperse microspheres, Janus particles, and core-shell microparticles with controllable morphologies are achieved by droplet microfluidics. Compared with conventional emulsion, droplet microfluidics has excellent advantages on improving the monodispersity of particles. This study attempts to use droplet microfluidics technology to prepare Janus microspheres with controlled morphology and large monomer selectivity. The configuration of droplets can be changed reversibly by the heating of ITO electrode. This paper includes the following parts:

1) Under macroscopic conditions, the investigation of inter-solubility between ionic liquid and water, and the determination of phase separation temperature;

2) Single phase droplets formation by using a mixture of an ionic liquid and water as dispersed phase and mineral oil as continuous phase;

3) ITO electrodes fabrication and the evaluation of heating performance;

4) The reversible variation of droplets` configuration by the heating of ITO electrode.

Key Words: Microfluidics  Janus droplet  Ionic liquid  Reversible phase separation

目录

摘要 I

Abstract II

目录 III

图清单 V

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