Solid and colloidal particles via sonochemistry

通过声化学分析固体和胶体颗粒

• 批准号: RGPIN-2017-05628
• 负责人: Boffito, DariaCamilla
• 金额: $ 1.75万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=710672
• 关键词: Solid; colloidal; particles; via; sonochemistry

Time-efficient and inexpensive synthetic routes to manufacture engineered solids and colloidal particles are required by the ever-changing market and applications. The long term objective is to develop ultrasound (ULS)-based techniques to manufacture far-ranging materials, including inorganic, organic, composite and hybrid matrices. I anticipate that modulating the local temperature and pressure, and micro-turbulence enacted by ultrasonic acoustic cavitation will fine-tune the structural-morphological properties of solid and colloidal particles, being these inorganic, organic or hybrid. The sub-objectives include: i) Sonochemical synthesis of catalysts for liquid-solid and gas-solid systems, ii) Sonochemical sol-gel and hydrothermal synthesis of hybrid inorganic-organic frameworks, iii) Sonochemical stabilization of colloidal particles for edible films. i) Synthesizing systems with a network of interconnected micro- and mesopores, combining high specific surface area and improved mass transfer is the major challenge in catalysis. The sol-gel technique, whereby a template directs the polymerization of the catalyst precursor in a 3D structure is the main method to synthesize these systems. I anticipate that ULS will improve the intercalation of the structure-directing agent and increase the gelation rate. The interpretation of the results will provide an understanding of the action of ULS on these mechanisms, which misses in the current state of the art. ii) Periodic mesoporous organosilicas (PMOs) and metal organic frameworks (MOFs) are hybrid inorganic-organic materials with inherent multidisciplinarity bridging fields of application including catalysis, fuel cells, gas storage, absorbents, enzyme immobilization, drug delivery, and imaging. Developing time-efficient syntheses is crucial for their application at the commercial scale (not yet attained). I will adopt ULS to shorten the gelation time to manufacture both PMOs and MOFs, thus replacing slow diffusion syntheses, such as the hydrothermal method, which can take up to several days. iii) Combining polysaccharides and proteins with hydrophobic materials or polymers at low concentration produces emulsion-based edible multilayer films with combined O2, CO2, and improved H2O barrier properties. Achieving a stable dispersion is the current challenge to manufacture targeted structures and warrant at the same time the mechanical strength of the film. I anticipate that the ultrasonically generated shock waves will improve the dispersion of the polar and non-polar molecules in water creating a very fine emulsion. We will quantify the effect of ULS on the properties of the emulsions of the hydrophilic polymer with the hydrophobic component and propose successful synthesis strategies.

不断变化的市场和应用需要高效率和廉价的合成路线来制造工程固体和胶体颗粒。长期目标是开发基于超声（ULS）的技术来制造广泛的材料，包括无机，有机，复合和混合矩阵。我预计，通过调节局部温度和压力，以及超声波声空化产生的微湍流，将微调固体和胶体颗粒的结构形态特性，无论是无机的、有机的还是混合的。子目标包括：i)液体-固体和气体-固体体系催化剂的声化学合成，ii)无机-有机杂化框架的声化学溶胶-凝胶和水热合成，iii)可食用薄膜胶体颗粒的声化学稳定。