Experimental investigations of the morphology and the morphology formation of levitated single-particles as a model system for reactive and non-reactive spray processes

作为反应性和非反应性喷雾过程模型系统的悬浮单粒子的形态和形态形成的实验研究

• 批准号: 122598328
• 负责人: Professor Dr. Hans-Ulrich Moritz
• 金额: --
• 依托单位: Institut für Technische und Makromolekulare Chemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/122598328?language=en
• 关键词: Experimental; investigations; morphology; formation; levitated

Spray polymerization is a comparatively new method for the production of polymer powders. In this process, polymerization, particle shaping, morphology formation and drying is carried out in one single process stage. Since the control of these processes is limited, the acoustic levitation, which enables the contactless positioning of droplets, is applied as a model system for spray processes. In this set-up, comparable conditions of reaction and drying are realized, especially by considering the relative velocity between droplet and gas phase. During the first funding period, the acoustic levitation was proven to be an adequate model system for spray processes. The morphology formation, as well as the drying- and reaction kinetics of different reaction systems were investigated under stationary and non-stationary conditions. The aim of this subsequent application is, basing on the up to now obtained results, observing the morphology formation of the particles in several reactive and non-reactive systems depending on different operating parameters. Afterwards, appropriate phase diagrams of the morphology are supposed to be developed. In the end, a basis is supposed to be built up in order to control the morphology selectively and verified exemplarily. In this context, the regulation of morphology is considered as well in cooperation with Prof. NIEKEN (modeling of morphology formation) and Prof. SIMON (fast online- image analysis). For that purpose, the ability of observing the particle morphology during the second drying phase is supposed to be improved by combining the video image analysis with the optical weighing of levitated droplets. In this way, monitoring the porosity, for instance, can be enabled. Different investigations on the second drying phase are planned as well, since it was observed that the polymer phase composition do have a particular influence on the morphology formation during the second drying phase. This influence is planned to be quantified and included in the modeling I cooperation with the research group of Prof. NIEKEN. Subsequently, emulsion polymerization as a heterogenic system is supposed to be investigated as well. Besides the parameters such as temperature or monomer composition, there are factors like the emulsifier concentration which influence the reaction- and drying kinetics as well as the morphology. For the production of tailored polymer powders, the knowledge about these factors is needed. In order to confirm the robustness of the acoustic levitator as a model system, drying processes and polymerizations are supposed to be carried out in a spraying tower under equal conditions.

喷雾聚合是一种较新的制备聚合物粉末的方法。在该工艺中，聚合、颗粒成型、形态形成和干燥在一个工艺阶段进行。由于对这些过程的控制是有限的，因此能够对液滴进行非接触式定位的声悬浮被用作喷雾过程的模型系统。在该装置中，特别是考虑了液滴和气相之间的相对速度，实现了反应和干燥的可比条件。在第一个供资期间，声学悬浮被证明是喷雾过程的适当模型系统。研究了不同反应体系在稳态和非稳态条件下的形态形成、干燥动力学和反应动力学。这一后续应用的目的是在目前所获得的结果的基础上，观察几种活性和非活性体系中颗粒的形态形成依赖于不同的操作参数。在此基础上，绘制了合适的相图。最后，为有选择地进行形貌控制奠定了基础，并进行了示范验证。在此背景下，还与Nieken教授(形态形成的模型)和Simon教授(快速在线图像分析)一起考虑了形态的调节。为此，应将视频图像分析与悬浮液滴的光学称重相结合，以提高观察第二干燥阶段颗粒形态的能力。通过这种方式，例如可以实现对孔隙率的监控。还计划对第二干燥阶段进行不同的研究，因为观察到聚合物相组成在第二干燥阶段对形态形成有特殊影响。这种影响计划被量化，并包括在与Nieken教授的研究小组合作的建模I中。随后，将乳液聚合作为一种非均相体系进行了研究。除了温度或单体组成等参数外，乳化剂浓度等因素也会影响反应和干燥动力学以及形态。对于定制聚合物粉末的生产，需要了解这些因素。为了验证声学悬浮器作为模型系统的稳健性，假设干燥过程和聚合反应在相同条件下在喷雾塔中进行。

项目成果

Characterization of the spray drying behaviour of emulsions containing oil droplets with a structured interface

• DOI: 10.3109/02652048.2012.726282
• 发表时间: 2013-05
• 期刊: Journal of Microencapsulation
• 影响因子: 3.9
• 作者: Yvonne Serfert;J. Schröder;A. Mescher;J. Laackmann;M. Q. Shaikh;K. Rätzke;V. Gaukel;H. Schuchmann;P. Walzel;H. Moritz;S. Drusch;Karin Schwarz

One-dimensional Raman spectroscopy and shadowgraphy for the analysis of the evaporation behavior of acetone/water drops

用于分析丙酮/水滴蒸发行为的一维拉曼光谱和阴影成像

• DOI: 10.1016/j.ijheatmasstransfer.2015.05.053
• 发表时间: 2015
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: J. Quiño;T. Hellwig;M. Griesing;W. Pauer;H.-U. Moritz;S. Will;A. Braeuer
• 通讯作者: A. Braeuer