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.

在该提案中，纤维素纳米晶体（CNC）被提议用作包括二氧化硅、铁和锆在内的各种悬浮液的稳定剂。初步实验和观察表明，这些在稳定胶体悬浮液方面非常有效。这将取决于待稳定的悬浮液/分散体的类型、其浓度、颗粒尺寸和分布以及表面特性。该项目中使用的纤维素纳米晶体（CNC）可以通过强酸水解从纤维素纤维中提取。水解条件影响纤维素纳米晶体的尺寸和表面性质。使用硫酸进行水解会产生表面带有阴离子硫基团的 CNC 颗粒，从而形成静电稳定的 CNC 水悬浮液。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很好地理解，并且它们已成功地与流变特性以及 pH 值、表面电荷和离子强度相关联。将详细研究它们与金属和非金属悬浮液/分散体的相互作用，即（i）悬浮液的稳定性和（ii）稳定机制（下划线物理）。