Data/hora: 16/06/2024 11:16:40

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	22/12/1999	
Data da última atualização: 	22/12/1999	
Autoria: 	MELLO, S. V.; RIUL JUNIOR, A.; MATTOSO, L. H. C.; FARIA, R. M.; OLIVEIRA JUNIOR, O. N.	
Afiliação: 	USP-IQSC; USP-IFSC; EMBRAPA-CNPDIA.	
Título: 	Protonation effects in polyaniline Langmuir films investigated by surface potential measurements.	
Ano de publicação: 	1996	
Fonte/Imprenta: 	In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS, July-Aug. 1996, Snowbird, UT, Estados Unidos. Abstracts... Snowbird: Utah University, 1996.	
Páginas: 	p.204.	
Idioma: 	Inglês	
Notas: 	Ref.P2.164.	
Conteúdo: 	Doping parent polyaniline (PAni) and its derivatives has been proven essential by obtaining stable Langmuir monolayers that are amenable to transfer onto solid substrates by the Langmuir-Blodgett (LB) technique. The doping process is generally carried out on the Langmuir trough, by spreading the polymer on an acidic subphase. The degree of doping affects the monolayer surface potential as the positive contribution from the double-layer increases with increasing protonation of the polymer molecules. One could then expect that the surface potential should increase with the acid concentration in the subphase, but instead the potential diminishes for increasing concentration in the range 10E-4 - 10E-1 M. This occurs because the polymer is already probably fully protonated on the 10E-4 M subphase and the double-layer contribution then decreases with the ionic strength. Interestingly, the results have been discussed in terms of the simple Gouy-Chapman theory, despite the complexity of the macromolecules involved.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (5627-1) - UPC - PL - -- - PROCI -  - 1996. - DIS