{"title":"Effect of poly(vinyl alcohol) on the rheological and drying properties of aqueous ceria-based suspensions under various pH conditions","authors":"Seong Hwan Kim , Donguk Kim , Hyun Wook Jung","doi":"10.1016/j.powtec.2025.120612","DOIUrl":null,"url":null,"abstract":"<div><div>Poly(vinyl alcohol) (PVA), as a polymeric binder, was incorporated into ceria-based suspensions to achieve better coating-relevant properties. The pH-dependent feature of PVA on the particle surface altered the interactions between the PVA-adsorbed ceria particles, significantly affecting the rheological and drying properties of the ceria–PVA suspensions. PVA adsorption on the ceria particles was determined by the PVA conformation, which resulted from the pH-dependent degree of ionization of its non-hydrolyzed acetate groups. This adsorption modified the primary interaction between PVA-adsorbed particles in suspensions, leading to either flocculation or stabilization, as confirmed with hydrodynamic diameter and zeta potential measurements. Suspensions with well-dispersed PVA-adsorbed ceria particles exhibited shear-thinning to Newtonian behavior, with weak thixotropic characteristics, whereas suspensions with flocculated particles displayed shear-thinning and strong thixotropic features. The mobility of the PVA-adsorbed ceria particles in sessile suspension droplets during drying, analyzed using multi-speckle diffusing wave spectroscopy, critically affected the final droplet patterns after drying.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120612"},"PeriodicalIF":4.5000,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591025000075","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Poly(vinyl alcohol) (PVA), as a polymeric binder, was incorporated into ceria-based suspensions to achieve better coating-relevant properties. The pH-dependent feature of PVA on the particle surface altered the interactions between the PVA-adsorbed ceria particles, significantly affecting the rheological and drying properties of the ceria–PVA suspensions. PVA adsorption on the ceria particles was determined by the PVA conformation, which resulted from the pH-dependent degree of ionization of its non-hydrolyzed acetate groups. This adsorption modified the primary interaction between PVA-adsorbed particles in suspensions, leading to either flocculation or stabilization, as confirmed with hydrodynamic diameter and zeta potential measurements. Suspensions with well-dispersed PVA-adsorbed ceria particles exhibited shear-thinning to Newtonian behavior, with weak thixotropic characteristics, whereas suspensions with flocculated particles displayed shear-thinning and strong thixotropic features. The mobility of the PVA-adsorbed ceria particles in sessile suspension droplets during drying, analyzed using multi-speckle diffusing wave spectroscopy, critically affected the final droplet patterns after drying.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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