Title:	Controlled biocide release from hierarchically-structured biogenic silica: surface chemistry to tune release rate and responsiveness.
Authors:	MATTOS, B. D. TARDY, B. L. PEZHMAN, M. KÄMÄRÄINEN, T. LINDER, M. SCHREINER, W. H. MAGALHAES, W. L. E. ROJAS, O. J.
Affiliation:	Bruno D. Mattos, Doutorando da UFPR / Aalto University; Blaise L. Tardy, Aalto University; Mohammadi Pezhman, Aalto University; Tero Kämäräinen, Aalto University; Markus Linder, Aalto University; Wido H. Schreiner, UFPR; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Orlando J. Rojas, Aalto University.
Date Issued:	2018
Citation:	Scientific Reports, v. 8, Article 5555, Apr. 2018. 11 p.
Description:	Biocides are essential for crop protection, packaging and several other biosystem applications. Therein, properties such as tailored and controlled release are paramount in the development of sustainable biocide delivery systems. We explore the self-similar nano-organized architecture of biogenic silica particles to achieve high biocide payload. The high surface area accessibility of the carrier allowed us to develop an efcient, low energy loading strategy, reaching signifcant dynamic loadings of up to 100mg·g?1. The release rate and responsiveness were tuned by manipulating the interfaces, using either the native hydroxyl surfaces of the carrier or systems modifed with amines or carboxylic acids in high density. We thoroughly evaluated the impact of the carrier-biocide interactions on the release rate as a function of pH, ionic strength and temperature. The amine and carboxyl functionalization strategy led to three-fold decrease in the release rate, while higher responsiveness against important agro-industrial variables. Key to our discoveries, nanostructuring thymol in the biogenic silica endowed systems with controlled, responsive release promoting remarkable, high and localized biocidal activity. The interfacial factors afecting related delivery were elucidated for an increased and localized biocidal activity, bringing a new light for the development of controlled release systems from porous materials.
NAL Thesaurus:	Biocides Nanotechnology Thymol
Keywords:	Biogenic silica Biocide delivery system Slow release Nanoporous material Chemical surface modification Natural biocide Nanobiocides Fractal supra structure Biological activity Mesoporous silica Functionalization of nanoparticles Sistema de liberação de biocida Nanotecnologia Sílica biogênica Liberação lenta Material nanoporoso Biocida natural Timol Modificação química de superfície Nanobiocida Supraestrutura fractal Atividade biológica Sílica mesoporosa Funcionalização de nanopartículas
DOI:	10.1038/s41598-018-23921-2
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPF)