Microstructural characterization of nanocellulose foams prepared in the presence of cationic surfactants

Autor(es)

Mariano, Marcos ^{[1, 2]} ; Hantao, Leandro Wang ^[1] ; Bernardes, Juliana da Silva ^[2] ; Strauss, Mathias ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, UNICAMP, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 195, p. 153-162, SEP 1 2018.
• Citações Web of Science: 5

Resumo

In this work, we explore the architecture of highly porous foams based on cellulose nanofibers (CNFs) prepared by using cationic surfactants (e.g., C(12)TAB, C(14)TAB, and C(16)TAB) as modifying agents. The addition of surfactants to CNF suspensions led the nanoparticles surface to be covered by these molecules, reducing the zeta-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 m(2) g(-1), obtained by n-decane adsorption, are reported. (AU)

• Processo FAPESP: 15/05059-9 - Desenvolvimento e avaliação de moduladores microfluídicos planares e livre de consumíveis para cromatografia gasosa bidimensional abrangente
• Beneficiário: Leandro Wang Hantao
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/04514-7 - Estudo do uso de nanopartículas de celulose no controle reológico de fluidos complexos
• Beneficiário: Juliana da Silva Bernardes
• Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Regular