Langmuir and Langmuir-Blodgett films of di-ureasil hybrid compounds containing phosphotungstic acid

Author(s)

Teles Rossini, Cabo Vinicius ; Molina, Celso ; Caseli, Luciano

• Document type: Journal article
• Source: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 524, p. 35-42, JUL 5 2017.
• Web of Science Citations: 7

Abstract

The search for new molecular architectures to improve the efficiency of sensors and optoelectronic devices is fundamental to enhance the effectiveness of nanostructured materials. In this present work, a di-ureasil hybrid compound (DUPTS) was spread at the air-water interface in order to form Langmuir monolayers. Phosphotungstic acid, H3PW12O40, PWA inserted in the aqueous subphase stabilized the formation of DUPTS as a stable Langmuir film, as showed with surface pressure and surface potential-area isotherms, rheological measurements, polarization modulation reflection-absorption spectroscopy, and Brewster angle microscopy. The monolayers were transferred to solid supports as Langmuir-Blodgett films and presented different patterns of heterogeneity as observed with atomic force microscopy, with the morphology dependent on the presence of PWA and on the kind of solid support surface. (AU)

• FAPESP's process: 15/23446-0 - Smart surfaces: nanostructured and bioinspired systems for the investigation of molecular interactions in membrane models and for the production of devices for biosensors and environmental analysis
• Grantee: Luciano Caseli
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/12557-2 - Multi-user equipment approved in grant 2013/14262-7: interfacial reometer
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Multi-user Equipment Program