Physical Properties of Water Near a Gold Surface: A Nanorheological Analysis

Autor(es)

Soares, David Mendez ^[1] ; Tenan, Mario Alberto ^[1] ; Gomide, Andreza Barbosa ^[1] ; Gomes, Wyllerson Evaristo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Phys, Lab Nanostruct & Interfaces, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ChemPhysChem; v. 11, n. 4, p. 905-911, MAR 5 2010.
• Citações Web of Science: 7

Resumo

Water at room temperature is not simply a medium for which uniform properties can always be assumed. Water close to solid hydrophobic or hydrophilic surfaces has elasticity, which is measured by monitoring the quartz crystal microbalance (QCM) resonant frequency and resistance. Small additions of salt are shown to modify this elasticity. Furthermore, near the hydrophobic QCM gold electrode, undersaturated aqueous NaCl solutions present a high concentration of ion pairs, which is confirmed by atomic force microscopy through force versus distance measurements. (AU)

• Processo FAPESP: 03/12529-4 - Nanotecnologia: fabricação de nanoestruturas e estruturas supramoleculares em meio líquido: observação das estruturas formadas e investigação dos processos de formação de nanoestruturas
• Beneficiário: Omar Teschke
• Modalidade de apoio: Auxílio à Pesquisa - Temático