{"title":"Enhanced rheological performance of shear thickening fluids: effects of graphene oxide nanoplatelets and clay nanoparticles","authors":"Sajjad Astaraki, Hanieh Easavinejad, Hosein Hasannezhad, Seyed Reza Payami, Yaser Bagheri, Sayed Hassan Nourbakhsh, Ata Khabaz-Aghdam","doi":"10.1007/s00396-025-05392-w","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigates the effects of graphene oxide nanoplatelets (GNPs) and bentonite clay nanoparticles on the rheological behavior of shear thickening fluids (STFs). STFs, which exhibit rapid viscosity increases under shear stress, were formulated using a base suspension of 35% silica nanoparticles in polyethylene glycol (PEG) and reinforced with either 2.5% or 5% GNPs or 2.5% clay. Rheological tests, including shear rate, frequency, and temperature sweeps, were conducted to analyze peak viscosity, critical viscosity, and the crossover points of storage modulus (G') and loss modulus (G''). Results reveal that GNPs significantly enhance the STF’s viscosity and shear sensitivity, with the 5% GNP-reinforced STF demonstrating the highest peak viscosity and lowest shear rates required for thickening, along with superior rigidity. Temperature-dependent testing highlights a marked decrease in viscosity with rising temperatures, attributable to increased molecular mobility. Frequency and strain-dependent analyses show that GNP-reinforced STFs offer greater structural integrity under dynamic loads, with the 5% GNP STF showing a quick transition to fluid-like behavior at higher moduli. This study underscores the value of GNPs, especially at higher concentrations, in tailoring STF properties for applications in impact resistance and adaptive damping.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":520,"journal":{"name":"Colloid and Polymer Science","volume":"303 5","pages":"907 - 921"},"PeriodicalIF":2.3000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloid and Polymer Science","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s00396-025-05392-w","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigates the effects of graphene oxide nanoplatelets (GNPs) and bentonite clay nanoparticles on the rheological behavior of shear thickening fluids (STFs). STFs, which exhibit rapid viscosity increases under shear stress, were formulated using a base suspension of 35% silica nanoparticles in polyethylene glycol (PEG) and reinforced with either 2.5% or 5% GNPs or 2.5% clay. Rheological tests, including shear rate, frequency, and temperature sweeps, were conducted to analyze peak viscosity, critical viscosity, and the crossover points of storage modulus (G') and loss modulus (G''). Results reveal that GNPs significantly enhance the STF’s viscosity and shear sensitivity, with the 5% GNP-reinforced STF demonstrating the highest peak viscosity and lowest shear rates required for thickening, along with superior rigidity. Temperature-dependent testing highlights a marked decrease in viscosity with rising temperatures, attributable to increased molecular mobility. Frequency and strain-dependent analyses show that GNP-reinforced STFs offer greater structural integrity under dynamic loads, with the 5% GNP STF showing a quick transition to fluid-like behavior at higher moduli. This study underscores the value of GNPs, especially at higher concentrations, in tailoring STF properties for applications in impact resistance and adaptive damping.
期刊介绍:
Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.