Collaborative Research: Electrospray Deposition of 'Melting Gels' for Multifunctional Coatings

合作研究：多功能涂层“熔融凝胶”的电喷雾沉积

• 批准号: 1911509
• 负责人: Andrei Jitianu
• 金额: $ 25.42万
• 依托单位: Research Foundation Of The City University Of New York (Lehman)
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1911509&HistoricalAwards=false
• 关键词: Collaborative; Research; Electrospray; Deposition; Melting

Silica glass has been valued more than 2000 years for its optical properties and chemical and thermal stability, making it a natural candidate for surface coatings. Current methods, such as chemical vapor deposition or conventional sol-gel processing, often require energy-costly high vacuum or high temperature methods. This collaborative project seeks to couple innovations in a new class of sol gel materials, 'melting gels', with electrospray deposition to create materials-efficient, durable hybrid glass coatings. Melting gels transform into these hybrid glasses at low temperatures enabling the use of substrates that would not normally be considered, such as polymer webs that are key for continuous manufacturing. The combination with electrospray, a type of industrially-accepted electrostatic manufacturing technology, enables thin (microscale) coatings on complex three-dimensional surfaces with facile incorporation of additives in ambient processing conditions. This award contributes fundamental understanding of the key process settings and the resulting coating properties (e.g. mechanical, electrical, chemical, and/or biological) that are desirable for a wide variety of coating applications. Results from this research benefits industrial applications in aerospace, nautical, automotive, and medical implant sectors, which would benefit U.S. economy. This project provides opportunities for students from a smaller Hispanic-serving institution and a major research institution to collaborate and engage in multidisciplinary research. Melting gels are oligomeric silsesquioxane materials made by a sol-gel process that possess consolidation temperatures in the range of 120 to 170 degree C, where the melting gels decompose and crosslink into an irreversible hybrid organically-modified silica network. Melting gels and their hybrid glass partners are synthesized using a soft-chemistry approach that allows for direct covalent bonding of organic moieties to the inorganic network. Electrospray deposition, a means of delivering uniform charged microdroplets in a high electric field, provides the necessary dynamic control of the micro- to nano-scale structure of melting gels to achieve superior coating properties. However, the effects of the charge injection and polarity of the spray on the sol-gel are currently unknown. This research varies these parameters along with the melting gel consolidation temperature and intrinsic charge to identify changes in the consolidation mechanism through primarily mechanical and spectroscopic analysis. These effects are then be connected to the final performance of the coatings. The team for this grant consists of two partners, combining sol-gel chemistry and electrospray deposition expertise to create a holistic approach for synthesis, processing, and property characterization.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

2000多年来，二氧化硅玻璃因其光学性能、化学和热稳定性而受到重视，使其成为表面涂层的天然候选材料。目前的方法，如化学气相沉积或传统的溶胶-凝胶处理，通常需要能源昂贵的高真空或高温方法。该合作项目旨在将新型溶胶凝胶材料“熔融凝胶”的创新与电喷涂沉积相结合，以创造材料高效，耐用的混合玻璃涂层。熔融凝胶在低温下转化为这些混合玻璃，从而可以使用通常不被考虑的基板，例如连续制造的关键聚合物网。与电喷涂（一种工业上公认的静电制造技术）相结合，可以在复杂的三维表面上实现薄（微尺度）涂层，并在环境加工条件下轻松加入添加剂。该奖项有助于对各种涂层应用所需的关键工艺设置和涂层性能（例如机械，电气，化学和/或生物）的基本理解。这项研究的结果有利于航空航天、航海、汽车和医疗植入领域的工业应用，这将有利于美国经济。该项目为来自较小的西班牙裔服务机构和主要研究机构的学生提供了合作和从事多学科研究的机会。熔融凝胶是由溶胶-凝胶工艺制成的低聚硅氧烷材料，其固结温度在120至170摄氏度之间，熔融凝胶分解并交联成不可逆的杂化有机改性二氧化硅网络。熔融凝胶及其杂化玻璃伙伴使用软化学方法合成，允许有机部分与无机网络直接共价键。电喷雾沉积是一种在高电场中输送均匀带电微滴的方法，它为熔融凝胶的微到纳米级结构提供了必要的动态控制，以实现卓越的涂层性能。然而，电荷注入和喷雾极性对溶胶-凝胶的影响目前尚不清楚。本研究将这些参数随熔融凝胶固结温度和本征电荷的变化而变化，主要通过力学和光谱分析来确定固结机制的变化。然后将这些影响与涂层的最终性能联系起来。该团队由两个合作伙伴组成，结合溶胶-凝胶化学和电喷涂沉积专业知识，为合成、加工和性能表征创造了一种整体方法。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Effect of tetraethoxysilane (TEOS) on melting gel behavior

• DOI: 10.1111/jace.17106
• 发表时间: 2020-04
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: L. Klein;Kutaiba Al-Marzoki;A. Jitianu;G. Rodríguez

Parametric Control of Melting Gel Morphology and Chemistry via Electrospray Deposition

通过电喷雾沉积对熔融凝胶形态和化学进行参数控制

• DOI: 10.1115/msec2021-63347
• 发表时间: 2021
• 期刊: ASME 2021 16th International Manufacturing Science and Engineering Conference
• 作者: 1. Grzenda, M.;Gamboa, A. R.;Mercado, J.;Lei, L.;Guzman, J.;Klein, L. C.;Jitianu, A.;Singer, J. P
• 通讯作者: Singer, J. P

Microscale Templating of Materials across Electrospray Deposition Regimes

• DOI: 10.3390/coatings13030599
• 发表时间: 2023-03-01
• 期刊: COATINGS
• 影响因子: 3.4
• 作者: Grzenda, Michael J.;Atzampou, Maria;Singer, Jonathan P.
• 通讯作者: Singer, Jonathan P.