用离子添加剂冲洗球形α-Al2O3颗粒的产应应力和泽塔电位-pH行为:粒子力和ChemBio 3D模拟
Wei Zhang1, Linbo Zhang2, Jialu Gao1
1Institute of Circular Economy, College of Materials Science and Technology, Beijing University of Technology, Beijing, 100124, China.
Heliyon
|October 10, 2024
概括
阳离子添加剂改变异电点 (IEP) 和悬浮的产应应力. 虽然酸减少了产量压力,但由于特定的吸引力,其他添加剂增加了产量压力.
科学领域:
- 材料科学 材料科学 材料科学
- 合体和表面化学
背景情况:
- 了解α- (α-Al2O3) 悬浮物的行为对于各种工业应用至关重要.
- 阳离子添加剂对悬浮特性 (如产量应力和泽塔潜力) 的影响是复杂的,需要进行详细的研究.
研究的目的:
- 描述带有和没有离子添加剂的α-Al2O3悬浮物的产量应力和zeta电位-pH行为.
- 为了研究不同离子添加剂对α-Al2O3悬浮物的稳定性和质性质的影响.
主要方法:
- 作为α-Al2O3悬浮的pH值函数的产量应力和泽塔电位的表征.
- 添加了三种典型的阴离子添加剂:酸,二氧化丁-基无水化盐和聚乙烯硫酸盐.
- 使用MM2模型进行模拟,以了解分子相互作用.
主要成果:
- 发现α-Al2O3颗粒的同电点 (IEP) 约为pH9.5.
- 增加阳离子添加剂的剂量使IEP转移到较低的pH值.
- 酸 (0.2 dwb%) 将50重%α-Al2O3悬浮液的最大产量应力降低了约36% (从78.3 Pa降至50 Pa),这是由于通过O-H···O键的固体排斥.
- 迪亚苏布烯 - 烯无水化盐和聚乙烯硫酸盐增加了由于特定吸引力,疏水吸引力和电荷吸引力而导致的最大产量应力.
结论:
- 阳离子添加剂显著改变α-Al2O3悬浮物的表面电荷和质性质.
- 阳离子添加剂对产量压力的作用取决于它们的化学结构和相互作用机制,导致产量压力减少 (固态排斥) 或增加 (各种吸引力).
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