{"title":"纳米粒子聚集对微凝胶复合材料流变性能的可逆控制。","authors":"Yul Hui Shim, Tae Yeon Kong, So Youn Kim","doi":"10.1021/acsami.5c06287","DOIUrl":null,"url":null,"abstract":"<p><p>Microgels are soft materials with tunable rheological properties, making them useful for applications such as 3D printing, drug delivery, and coatings. However, balancing printability and structural stability remains a key challenge. In this study, to overcome this issue, we investigate nanoparticle aggregation as a reversible physical cross-linking mechanism in silica-Carbopol microgel composites. The surface charge of silica nanoparticles is pH-sensitive, resulting in aggregation at low pH and dispersion at high pH. This aggregation enhances rheological properties by increasing elasticity and yield stress, while dispersion reduces the rheological properties by allowing for easy flow. Using SAXS, NMR, and recovery rheology, we characterize these structural transitions and demonstrate that aggregation kinetics can be accelerated by tuning the nanoparticle size, temperature, and concentrations. This tunable cross-linking mechanism allows precise control over microgel behavior, enabling their use as recyclable direct-ink-writing printing inks. By using pH and temperature control, our approach provides a pathway to create microgel composites with reversible mechanical properties, opening new possibilities for advanced ink formulations and sustainable material applications.</p>","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":" ","pages":""},"PeriodicalIF":8.3000,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Reversible Control of Rheological Properties in Microgel Composites via Nanoparticle Aggregation.\",\"authors\":\"Yul Hui Shim, Tae Yeon Kong, So Youn Kim\",\"doi\":\"10.1021/acsami.5c06287\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Microgels are soft materials with tunable rheological properties, making them useful for applications such as 3D printing, drug delivery, and coatings. However, balancing printability and structural stability remains a key challenge. In this study, to overcome this issue, we investigate nanoparticle aggregation as a reversible physical cross-linking mechanism in silica-Carbopol microgel composites. The surface charge of silica nanoparticles is pH-sensitive, resulting in aggregation at low pH and dispersion at high pH. This aggregation enhances rheological properties by increasing elasticity and yield stress, while dispersion reduces the rheological properties by allowing for easy flow. Using SAXS, NMR, and recovery rheology, we characterize these structural transitions and demonstrate that aggregation kinetics can be accelerated by tuning the nanoparticle size, temperature, and concentrations. This tunable cross-linking mechanism allows precise control over microgel behavior, enabling their use as recyclable direct-ink-writing printing inks. By using pH and temperature control, our approach provides a pathway to create microgel composites with reversible mechanical properties, opening new possibilities for advanced ink formulations and sustainable material applications.</p>\",\"PeriodicalId\":5,\"journal\":{\"name\":\"ACS Applied Materials & Interfaces\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":8.3000,\"publicationDate\":\"2025-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Materials & Interfaces\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1021/acsami.5c06287\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsami.5c06287","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Reversible Control of Rheological Properties in Microgel Composites via Nanoparticle Aggregation.
Microgels are soft materials with tunable rheological properties, making them useful for applications such as 3D printing, drug delivery, and coatings. However, balancing printability and structural stability remains a key challenge. In this study, to overcome this issue, we investigate nanoparticle aggregation as a reversible physical cross-linking mechanism in silica-Carbopol microgel composites. The surface charge of silica nanoparticles is pH-sensitive, resulting in aggregation at low pH and dispersion at high pH. This aggregation enhances rheological properties by increasing elasticity and yield stress, while dispersion reduces the rheological properties by allowing for easy flow. Using SAXS, NMR, and recovery rheology, we characterize these structural transitions and demonstrate that aggregation kinetics can be accelerated by tuning the nanoparticle size, temperature, and concentrations. This tunable cross-linking mechanism allows precise control over microgel behavior, enabling their use as recyclable direct-ink-writing printing inks. By using pH and temperature control, our approach provides a pathway to create microgel composites with reversible mechanical properties, opening new possibilities for advanced ink formulations and sustainable material applications.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.