Wohl Christopher J, Kiefer Jacob M, Petrosky Brian J, Tiemsin Pacita I, Lowe K Todd, Maisto Pietro M F, Danehy Paul M
NASA Langley Research Center , Hampton, Virginia 23681, United States.
NASA Langley Research Summer Scholars (LARSS), NASA Langley Research Center , Hampton, Virginia 23681, United States.
ACS Appl Mater Interfaces. 2015 Sep 23;7(37):20714-25. doi: 10.1021/acsami.5b05584. Epub 2015 Sep 14.
Kiton red 620 (KR620) doped polystyrene latex microspheres (PSLs) were synthesized via soap-free emulsion polymerization to be utilized as a relatively nontoxic, fluorescent seed material for airflow characterization experiments. Poly(styrene-co-styrenesulfonate) was used as the PSL matrix to promote KR620 incorporation. Additionally, a bicarbonate buffer and poly(diallyldimethylammonium chloride), polyD, cationic polymer were added to the reaction solution to stabilize the pH and potentially influence the electrostatic interactions between the PSLs and dye molecules. A design of experiments (DOE) approach was used to efficiently investigate the variation of these materials. Using a 4-factor, 2-level response surface design with a center point, a series of experiments were performed to determine the dependence of these factors on particle diameter, diameter size distribution, fluorescent emission intensity, and KR620 retention. Using statistical analysis, the factors and factor interactions that most significantly affect the outputs were identified. These particles enabled velocity measurements to be made much closer to walls and surfaces than previously. Based on these results, KR620-doped PSLs may be utilized to simultaneously measure the velocity and mixing concentration, among other airflow parameters, in complex flows.
通过无皂乳液聚合合成了基通红620（KR620）掺杂的聚苯乙烯胶乳微球（PSL），用作气流表征实验中相对无毒的荧光种子材料。聚（苯乙烯 - 共 - 苯乙烯磺酸盐）用作PSL基质以促进KR620的掺入。此外，向反应溶液中加入碳酸氢盐缓冲液和聚（二烯丙基二甲基氯化铵）（聚D，阳离子聚合物）以稳定pH值并潜在地影响PSL与染料分子之间的静电相互作用。采用实验设计（DOE）方法有效研究这些材料的变化。使用具有中心点的4因素、2水平响应面设计，进行了一系列实验，以确定这些因素对粒径、粒径分布、荧光发射强度和KR620保留率的依赖性。通过统计分析，确定了对输出影响最显著的因素和因素相互作用。与以前相比，这些颗粒能够在更靠近壁和表面的位置进行速度测量。基于这些结果，KR620掺杂的PSL可用于同时测量复杂流动中的速度和混合浓度以及其他气流参数。
