Stabilization of metalic and non-metallic suspensions using Nanocrystalline Cellulose (CNC)

使用纳米晶纤维素 (CNC) 稳定金属和非金属悬浮液

• 批准号: 522393-2017
• 负责人: Hatzikiriakos, Savvas
• 金额: $ 1.98万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682004
• 关键词: Stabilization; metalic; non; metallic; suspensions

In this proposal, Cellulose Nanocrystals (CNCs) are proposed to be used as stabilizing agents for various suspensions including silica, iron and zirconium. Preliminary experiments and observations have shown that these could be extremely effective in stabilizing colloidal suspensions. This will depend on the type of suspension/dispersion to be stabilised, its concentration, particle size and distribution as well surface characteristics. Cellulose nanocrystals (CNC) which will be used in this project can be extracted from cellulose fibers using strong acid hydrolysis. The hydrolysis conditions affect the size and surface properties of cellulose nanocrystals. Using sulfuric acid for the hydrolysis results in CNC particles with anionic sulfur groups on the surface, leading to electrostatically stabilized CNC aqueous suspensions. The stability of these suspensions also depends on the ionic strength, pH, size and concentration. The morphological changes of these suspensions are well understood and they have been correlated successfully with rheological properties as well as pH, surface charge and ionic strength. Their interactions with metallic and non-metallic suspensions/dispersions will be studied in detail i.e. (i)stabilization of the suspensions and (ii) mechanisms (underlined physics) for stabilization.

在此提案中，提出纤维素纳米晶体（CNC）用作硅，铁和锆在内的各种悬浮液的稳定剂。初步实验和观察结果表明，这些实验可能在稳定胶体悬浮液方面非常有效。这将取决于要稳定的悬浮液/色散的类型，其浓度，粒径和分布以及表面特征。可以使用强酸水解从纤维素纤维中提取该项目中使用的纤维素纳米晶体（CNC）。水解条件会影响纤维素纳米晶体的大小和表面特性。使用硫酸进行水解，导致CNC颗粒在表面上具有阴离子硫基团，从而导致静电稳定的CNC水性悬浮液。这些悬浮液的稳定性还取决于离子强度，pH，大小和浓度。这些悬浮液的形态变化已被充分理解，它们与流变学特性以及pH，表面电荷和离子强度成功相关。它们与金属和非金属悬浮液/分散体的相互作用将进行详细研究，即（i）悬浮液的稳定和（ii）稳定的机制（带下划线的物理学）。