Hydroxyl groups on cellulose nanocrystal surfaces form nucleation points for silver nanoparticles of varying shapes and sizes

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:584

Article

Musino, Dafne¹  Rivard, Camille^2,3  Landrot, Gautier²  Novales, Bruno¹  Rabilloud, Thierry⁴  Capron, Isabelle¹ 

[1] INRAE, BIA, Rue Geraudiere, F-44316 Nantes, France

[2] SOLEIL Synchrotron, F-91192 St Aubin, France

[3] INRAE, TRANSFORM, F-44316 Nantes, France

[4] Univ Grenoble Alpes, CNRS, CEA, IRIG,SYMMES,Lab Chim & Biol Met, F-38000 Grenoble, France

关键词: Bacterial cellulose nanocrystal (BCN);    Hydroxyl groups;    Surface modification;    Silver nanoparticles (AgNPs);    AgNP size-shape variation;    Hydrophobic BCN;    Hybrid nanomaterial;   

DOI  :  10.1016/j.jcis.2020.09.082

来源: Elsevier

【 摘 要 】

In this study, we investigate the interactions between the cellulose surface and Ag nanoparticles (AgNPs) for the purpose of manufacturing hybrid nanomaterials using bacterial cellulose nanocrystals (BCNs) as a model substrate. We focus on the role of the BCN surface chemistry on the AgNP nucleation obtained by chemical reduction of Ag+ ions. Homogeneous hybrid suspensions of BCN/AgNP are produced, regardless of whether the BCNs are quasi-neutral, negatively (TBCNs) or positively charged (ABCNs). The characterization of BCN/AgNP hybrids identifies the -OH surface groups as nucleation points for AgNPs, of about 20 nm revealing that surface charges only improve the accessibility to OH groups. X-ray Absorption technics (XANES and EXAFS) revealed a high metallic Ag-0 content ranging from 88% to 97%. Moreover, the grafting of hydrophobic molecules on a BCN surface (HBCNs) does not prevent AgNP nucleation, illustrating the versatility of our method and the possibility to obtain bifunctional NPs. A H2O2 redox posttreatment on the hybrid induces an increase in AgNPs size, up to 90 nm as well as a shape variation (i.e., triangular). In contrast, H2O2 induces no size/shape variation for aggregated hybrids, emphasizing that the accessibility to -OH groups ensures the nucleation of bigger Ag nano-objects (C) 2020 The Authors. Published by Elsevier Inc.

【 授权许可】

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