【作者】 朱丽；

【导师】 侯丽雅； 章维一；

【作者基本信息】 南京理工大学 ， 精密仪器及机械， 2009， 博士

【摘要】 微流体系统是微系统中一个重要的研究领域,微流体的喷射和混合是微流体系统中重要的研究方向。目前实现微喷射及微混合的方法很多,但大多对流体的性质有较高要求,且微器件的加工工艺较复杂、成本相对较高,限制了微喷射及混合的实际应用。为此研究新型的微流体驱动方式,对工作流体无特殊要求,具有广泛适用性的微喷射和微混合技术是值得研究的重要课题;同时需要很好的解决核心微器件的设计与制作、微喷射及混合的应用等问题。微流体数字化技术在基本概念和理论上有原创性,该技术为建立与信息化、能量传输及固体运动数字化有同等意义的物质传输数字化开辟了道路。本论文以微流体数字化技术为起点,从微流体理论和实验研究、基础微器件的设计与制造等方面,研究了微流边界层流固摩擦耦合作用驱动理论、数字化微喷射技术、数字化微喷射混合理论、数字化微喷射混合器的设计、制作及应用,取得以下成果:给出了微流边界层流固摩擦耦合作用驱动圆柱形微管内流体的理论分析结论,对圆柱形微管道内流体的运动进行了理论分析、数值模拟及驱动实验;在此基础上设计了新型微喷管结构,对微喷射原理及过程进行了分析,并对影响微喷射的主要因素进行了讨论。进行了数字化微喷射的实验研究。对影响微喷射过程的相关因素及喷射过程中相关参数测量进行了研究,表明数字化微喷射具有稳定性强、均匀性好、分辨率高、过程实时可控、广泛的适用性及良好的抗气泡阻断性等特征。基于数字化微喷射技术设计了两种类型的微喷射混合器——Y型微混合器和同轴型微混合器。提出了一种新的微流体器件的制作方法:用水平式玻璃微器件制备仪拉制出微管道,将一维微管道直接粘接组合成微管道网络,不需要键合及钻孔工艺,制得具有微特性而非微外形的微器件,该方法制作简单,成本低。进行了微喷射混合原理实验,实现了不同种类组分间的混合反应,对于混合反应的流体没有特殊要求,具有混合尺度可控、混合比例可调以及混合均匀性好等特征。进行了数字化微混合器在微制造中的应用实验研究,利用同轴型与Y-同轴结合型微混合器进行了微胶囊的制备,无需加热加压,可以制备不同种类芯材的微胶囊,制备的微胶囊大小均匀,形状规则,尺寸和形态可控。采用Y型数字化微混合器结合常温下化学沉积金属银的方法,制造出了组织致密、边缘光滑、线宽均匀的金属银线;通过重复沉积,获得了所需厚度的金属银微结构。更多还原

【Abstract】 Micro fluidic system is an important branch of micro systems. And micro jetting and micro mixing technology are the important research contents of the micro fluidic system. There are a lot of realization methods for micro jetting and micro mixing, but most of them have bottlenecks such as special properties request for fluid, difficulty of fabrication of the micro components and so on. Therefore problems in method for driving microfluid, micro jetting and mixing technology without special fluid properties request, designing and fabrication of the micro components and application researchs of micro jetting and mixing technology should be well solved.There are some creative theories in the digitalization of micro fluidic technology, which exploits the field of the digital matter transportation, equaled with the informationization, digital energy transmission and solid movement. Considering the aspects of theory and experiment research on micro fluidic and designing and fabrication of the basic micro components, the research achievements on the theory of micro fluidic driving, digital micro jetting technology, designing and fabrication of the micro jet-mixer and confirmed and applied experiments of digital micro jet-mixer are presented as follow base on the digitalization of micro fluidic technology.A novel micro fluidic driving technique is proposed on the friction coupling effect between the micro fluidic boundary layer and solid wall of the microchannel. Dynamic aspects of the micro flow in cylindrical microchannels are analysed. The validity of the presented principle is verified by experiments. A new structure of microchannel is designed and the principle and impact factors of micro jetting are analyzed.Digital micro jetting has been realized by micro jetting experiment. The impact factors of micro jetting were summarized, and the correlative parameters of micro jetting were measured. The digital micro jetting has the characteristic of high stability, uniformity, resolution and real time control. The kinds of the fluid materials that can be injected include conventional liquids as well as solid powders, pastes, and other substances of similar characteristics.Two types of micromixer are designed by micro jetting technology. One is Y-type and other is co- axial. The micro jet-mixer is fabricated by fitting glass microchannels together without micro moving parts. These glass microchannels are produced by microchannel puller dispense with complicated microfabrication technology, hence greatly simplifying the structure and reducing the cost. The performance of the mixer is verified by the different experiments. Digital micro mixing- reaction has been realized. The kinds of the fluid materials that can be mixed include conventional liquids as well as solid powders, pastes, and so on. By changing the driving parameters, the mixing effect can be improved effectively.The application of digital micro jet-mixer in micro manufacturing is researched. A new method of microcapsule molding by digital micro jet-mixer is proposed. The microcapsule with different kinds of core materials can be modeled by co-axial type and Y- combined co-axial micro jet-mixer at normal temperature and pressure. The microcapsule has regular appearance and even size. The size and conformation of microcapsules can be controlled through changing driving parameters. By Y- type micro jet-mixer and technology of chemical deposition of silver, micron scale silver lines were obtained with fine structure, smoothness of edge and width. Micro component of silver in three dimensions was manufactured by superposition of the composite coat.更多还原