Effect of PVA saponification degree on internal structural changes in silica slurry during drying

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2026-03-01 Epub Date: 2026-02-26 DOI:10.1016/j.apt.2026.105189

Hiromasa Kuroda , Junichi Tatami , Motoyuki Iijima , Takuma Takahashi

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引用次数: 0

Abstract

This study examined the effect of adding polyvinyl alcohol (PVA) with varying degrees of saponification to an aqueous silica slurry on internal structural changes during drying using optical coherence tomography. During the initial stage of drying, the slurries began to agglomerate from the surface. Particle concentration in the agglomerated regions increased with higher saponification degrees of the added PVA. Considering the solubility of PVA and the hydrophilicity of the adsorption layer on the particles, the effect of saponification degree on the particle concentration in the agglomerated regions is attributed to variations in the electrophoretic mobility distribution and the thickness of the PVA adsorption layer on the particles. In the middle stage of drying, the magnitude of deformation in the agglomerated regions varied depending on the particle concentration and the thickness of the PVA adsorption layer. The dominant factors controlling the green density of the dried slurry were both the particle concentration in the agglomerated regions during the initial stage and the magnitude of deformation in these regions during the middle stage.

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PVA皂化程度对干燥过程中硅浆内部结构变化的影响

本研究利用光学相干断层成像技术研究了在硅水浆中加入不同皂化程度的聚乙烯醇（PVA）对干燥过程中硅水浆内部结构变化的影响。在干燥的初始阶段，浆料开始从表面聚集。聚乙烯醇的皂化程度越高，团聚区的颗粒浓度越高。考虑到PVA的溶解度和吸附层对颗粒的亲水性，皂化程度对凝聚区颗粒浓度的影响归因于粒子的电泳迁移率分布和PVA吸附层厚度的变化。在干燥中期，颗粒浓度和PVA吸附层的厚度不同，团聚区的变形大小也不同。控制干燥浆体绿密度的主导因素是初始阶段凝聚区的颗粒浓度和中期这些区域的变形幅度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)