Jeong Hun Choi, Nitee Kumari, Anubhab Acharya, Amit Kumar, Sanghwang Park, Dongyeon Ro, Jongcheol Seo, Eunhye Lee, Jee Hwan Bae, Dong Won Chun, Kyungtaek Oh, Sunmin Ryu and In Su Lee
{"title":"Solid-state self carbo-passivation for refurbishing colloidal dispersity of catalytic silica nanoreactors†","authors":"Jeong Hun Choi, Nitee Kumari, Anubhab Acharya, Amit Kumar, Sanghwang Park, Dongyeon Ro, Jongcheol Seo, Eunhye Lee, Jee Hwan Bae, Dong Won Chun, Kyungtaek Oh, Sunmin Ryu and In Su Lee","doi":"10.1039/D4MH01623H","DOIUrl":null,"url":null,"abstract":"<p >Silica-based nanostructures are among the most utilized materials. However, a persistent challenge is their irreversible agglomeration upon drying and heat treatments, restricting their homogeneous colloidal re-dispersion – a mandatory requirement for diverse bio-applications. We address this bottleneck by developing a self carbo-passivation (SCP) strategy: silica nanoparticles (NPs), pre-included with the catalytic metal precursors and organosilanes undergo <em>in vacuo</em> thermochemical conversion with highly controlled interior-to-surface segregation of nanometer-scale “carbonaceous skin patches”. This self-generated inert passivate shielding phenomenon at the individual NP level completely inhibits interparticle cross-linking, stopping chemical agglomeration and enhancing colloidal stability. By SCP, we synthesized silica-based magnetic–catalytic nanoreactors for magnetic field-induced catalysis inside living cells, by benefitting from the convenient high colloidal stability in bio-media, easy endocytosis and protective accessibility to the catalytic site in the complex bio-environment. The present work demonstrates deep mechanistic insight into unexplored solid-state nanoscopic chemical passivation phenomena, dramatically influencing NP surface characteristics, playing a critical role in solution-based applications.</p>","PeriodicalId":87,"journal":{"name":"Materials Horizons","volume":" 5","pages":" 1581-1588"},"PeriodicalIF":12.2000,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Horizons","FirstCategoryId":"88","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/mh/d4mh01623h","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Silica-based nanostructures are among the most utilized materials. However, a persistent challenge is their irreversible agglomeration upon drying and heat treatments, restricting their homogeneous colloidal re-dispersion – a mandatory requirement for diverse bio-applications. We address this bottleneck by developing a self carbo-passivation (SCP) strategy: silica nanoparticles (NPs), pre-included with the catalytic metal precursors and organosilanes undergo in vacuo thermochemical conversion with highly controlled interior-to-surface segregation of nanometer-scale “carbonaceous skin patches”. This self-generated inert passivate shielding phenomenon at the individual NP level completely inhibits interparticle cross-linking, stopping chemical agglomeration and enhancing colloidal stability. By SCP, we synthesized silica-based magnetic–catalytic nanoreactors for magnetic field-induced catalysis inside living cells, by benefitting from the convenient high colloidal stability in bio-media, easy endocytosis and protective accessibility to the catalytic site in the complex bio-environment. The present work demonstrates deep mechanistic insight into unexplored solid-state nanoscopic chemical passivation phenomena, dramatically influencing NP surface characteristics, playing a critical role in solution-based applications.