Development of the in-situ measurement compound equipment of the power between the surfaces, and surface detailed structure

面间功率及面详细结构原位测量复合装置的研制

• 批准号: 13450317
• 负责人: HIGASHTIANI Ko
• 金额: $ 9.92万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450317/
• 关键词: Atomic force microscope; Adsorbed layer; Polymer; Surface force; Adhesion force; Flocculants; 吸着; 表面; 水溶液

In situ observation for the investigation of the structure of adsorbed layer on mica plate in cationic polymer-electrolyte aqueous solution was carried out by using an atomic force microscope. Interaction forces between surfaces were also measured in the same way. Comparing with both results each other, following conclusions were obtained.(1) It takes over 10 days until the enough relaxation of the cationic polymer-electrolyte molecules. We succeeded in-situ observation of single molecule whose molecular weight is 10 million in water, after keeping its dilute solution for 20 days.(2) The shape of the adsorbed structure is like the island structure and its size increases with its molecular weight.(3) Addition of inorganic electrolytes makes the adsorbed structure small because of the decrease of the electrostatic repulsive force and the suppression of polymer relaxation.(4) Block-like adsorbed structure invites larger and longer-range attractive force and has higher flocculate effect th … More an the chain like. This suggests that the powder-style polymer flocculants should be employed to the flocculation process at the time before its sufficient relaxation occurs.Similar investigations for amphoteric polymer electrolytes were carried out and following conclusions were obtained.(1) At the neutral pH, in which the amphoteric polymer molecules become neutral, their adsorbed structure is block like. In the lower pH range, polymer molecules adsorb like chains, because their positive charges become predominant.(2) The thickness of the adsorbed layer of the polymer molecules increases with pH. According to adhesion results, the solution pH does not influence to the flocculation.The effect of poly-aluminum chloride which is often used for real processes was investigated and the following were concluded.(3) Very small block-like polymer adsorbs with high density on the surface modified by poly-aluminum chloride.(4) Strong attractive force will act between these surfaces. This is expressed as the electrostatic force, which is attributed that multi-valence cations localized on the negative charge surface and big electrostatic attractive force appears. Less

用原子力显微镜对阳离子聚合物-电解质水溶液中云母片表面的吸附层结构进行了原位观察。表面之间的相互作用力也是以同样的方式测量的。结果表明：(1)阳离子聚合物-电解质分子需要10天以上的时间才能达到足够的松弛。在稀溶液中放置20天后，我们成功地在水中原位观察到了分子量为1,000万的单分子。(2)吸附结构呈岛状结构，其大小随着分子量的增加而增大。(3)无机电解质的加入使吸附结构变小，这是由于静电斥力的减小和聚合物松弛的抑制。(4)块状吸附结构比…具有更大的、更远范围的吸引力和更高的絮凝效果更像是一条链子。对两性聚合物电解质进行了类似的研究，得到了如下结论：(1)在中性pH条件下，两性聚合物分子变为中性时，其吸附结构呈块状。在较低的pH范围内，由于聚合物分子的正电荷占优势，聚合物分子会以链状吸附。(2)聚合物分子的吸附层厚度随pH的升高而增加。根据粘接结果，溶液的pH值对絮凝效果没有影响。研究了实际加工中常用的聚合氯化铝的吸附效果，得出以下结论：(3)聚氯化铝表面吸附密度很高的极小的块状聚合物。(4)这些表面之间会产生很强的吸引力。这被表示为静电力，这归因于多价阳离子定域在负电荷表面，出现了较大的静电引力。较少

项目成果

Ko Higashitani: "Dynamic features of short-range interaction force and adhesion in solutions"J. Colloid Interface Sci.. 242(1). 110-120 (2001)

Ko Higashitani：“溶液中短程相互作用力和粘附力的动态特征”J。

Ko Higashitani: "Dynamic features of short-range interaction force and adhesion in solutions"J. Colloid Interface Sci. 242. 110-120 (2001)

Ko Higashitani：“溶液中短程相互作用力和粘附力的动态特征”J。

Ko Higashitani: "Suspension rheology -fundamentals and application to industrial processes"Chem. Eng. Sci.. 56(9). 2899 (2001)

Ko Higashitani：“悬浮液流变学 - 基础知识及其在工业过程中的应用”Chem。

東谷 公分担: "微粒子工学体系1"フジテクノシステム. 1196 (2001)

东谷公开分享：《粒子工程系统1》Fuji Techno System 1196 (2001)。

Ko Higashitani: "Optical observation of gas bridging between hydrophobic surfaces in water"Journal of Colloid and Interface Science. 253. 112-116 (2002)

Ko Higashitani：“水中疏水表面之间气体桥接的光学观察”胶体与界面科学杂志。