Amino acid-driven hydrophobization of alumina and production of particle stabilised foams in a broader pH range

Autor(es)

dos Santos Junior, T. ^[1] ; Pereira, I, C. ; Goncalves, R. ^[2] ; Fernandes, C. H. M. ^[3] ; Salvini, V. R. ^[4] ; Pandolfelli, V. C. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Mat Engn Dept, FIRE Associate Lab, Grad Program Mat Sci & Engn PPGCEM, Mat Microstruc, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Mat Engn Dept, Smart Mat Res Team SMaRT, Grad Program Mat Sci & Engn PPGCEM, Rodovia Washington Luis, Km 235, BR-13566905 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Chem Dept, Lab Res Eletrochem LaPE, Rodovia Washington Luis, Km 235, BR-13566905 Sao Carlos, SP - Brazil

^[4] Coll Technol FATEC Sertaozinho, Jordao Borghetti St 480, BR-14160050 Sertaozinho, SP - Brazil

^[5] Pereira, C., I, Univ Fed Sao Carlos, Mat Engn Dept, FIRE Associate Lab, Grad Program Mat Sci & Engn PPGCEM, Mat Microstruc, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 40, n. 12, p. 4243-4252, SEP 2020.
• Citações Web of Science: 0

Resumo

The interaction of amino acids (glycine, L-valine, L-isoleucine and L-leucine) with alumina surface was studied to induce partial hydrophobization and production of ultrastable particle-stabilised foams. The evaluation of these amino acids was carried out by mechano-quantum simulations followed by experimental tests (foamability, zeta potential, contact angle and foam lifetime measurements). The experimental results agreed with the trends pointed out by the simulations. The selected amino acids interact with alumina particles in aqueous media and in a broader pH range, leading to hydrophobization of surfaces, which was more intense for amino acids with higher molecular mass (isoleucine and leucine). As a consequence, ultrastable foams with a longer lifetime ( > 100 h) were produced and the foam microstructure was preserved from ageing phenomena. Moreover, the attained foams were stable at different pH, opening up new possibilities to develop macroporous multiphasic ceramics, which can result in novel materials for thermal insulation at high temperatures. (AU)

• Processo FAPESP: 18/09761-8 - Estudo e desenvolvimento de compósitos de metal/polímero iônico para aplicação em atuadores e sensores visando baixo custo e alta performance
• Beneficiário: Roger Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado