Microstructural characterization of nanocellulose foams prepared in the presence of cationic surfactants
Marcos Mariano, Leandro Wang Hantao, Juliana da Silva Bernardes, Mathias Strauss
ARTIGO
Inglês
Agradecimentos: The authors would like to acknowledge the Brazilian National Council for Scientific and Technological Development (CNPq) for the financial support (M.M. Fellowship), as well as the São Paulo Research Foundation (FAPESP Grants No. 2015/05059-9 and 2016/04514-7). We would like to thank...
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Agradecimentos: The authors would like to acknowledge the Brazilian National Council for Scientific and Technological Development (CNPq) for the financial support (M.M. Fellowship), as well as the São Paulo Research Foundation (FAPESP Grants No. 2015/05059-9 and 2016/04514-7). We would like to thank the National Center for Research in Energy and Materials (CNPEM) and the Brazilian Nanotechnology National Laboratory (LNNano). Also, we thank Dr. Rubia Figueredo Gouveia for the microCT measurements, together with Dr. Sivoney Ferreira de Souza and Dr. Cony Gauche, for the valuable contributions and endless discussions
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In this work, we explore the architecture of highly porous foams based on cellulose nanofibers (CNFs) prepared by using cationic surfactants (e.g., C12TAB, C14TAB, and C16TAB) as modifying agents. The addition of surfactants to CNF suspensions led the nanoparticles surface to be covered by these...
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In this work, we explore the architecture of highly porous foams based on cellulose nanofibers (CNFs) prepared by using cationic surfactants (e.g., C12TAB, C14TAB, and C16TAB) as modifying agents. The addition of surfactants to CNF suspensions led the nanoparticles surface to be covered by these molecules, reducing the ζ-potential from −35 to −8 mV, which, together with hydrophobic interactions of adsorbed surfactants, causes CNF flocculation. After freeze-casting and lyophilization, mechanical properties and pores structure of the low-density foams obtained (15.6–30.9 mg cm−3) proved to be strongly dependent on nanofibers agglomeration degree. The primary causes of such dependence could not be observable by scanning electron microscopy but were found to be very significant on X-ray microtomography analysis. Total porosity, pore-size, and wall thickness of the foams were calculated and related to the surfactant chain size. Surface areas from 4.7 to 48.6 m2 g−1, obtained by n-decane adsorption, are reported
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2015/05059-9; 2016/04514-7
Fechado
Microstructural characterization of nanocellulose foams prepared in the presence of cationic surfactants
Marcos Mariano, Leandro Wang Hantao, Juliana da Silva Bernardes, Mathias Strauss
Microstructural characterization of nanocellulose foams prepared in the presence of cationic surfactants
Marcos Mariano, Leandro Wang Hantao, Juliana da Silva Bernardes, Mathias Strauss
Fontes
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Carbohydrate polymers: a journal devoted to scientific and technological aspects of industrially relevant polysaccharides Vol. 195 (Sept., 2018), p. 153-162 |