Tensão superficial dinâmica de soluções aquosas do surfactante catiônico Cloreto de Cetilpiridínio pelo método da massa da gota

• Ano de defesa: 2001
• Autor(a) principal: Borges, Maria das Graças Garcia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Química
• Palavras-chave em Português: Tensão superficial; Massa da gota; Cloreto de Cetilpiridínio; Cetylpyridinium Chloride; Surface tension; Drop Mass; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/26764; http://dx.doi.org/10.14393/ufu.di.2001.11

The dynamic mass drop method (TSDMG) was used for obtaining data of the dynamic surface tension (yt) for the water and aqueous Solutions of the surface active cetylpyridinium chloride (CPC). Data from the dynamic surface tension were used to calculate the criticai micelle concentration (CMC) and the equilibrium surface tension (ye). The results are in good agreement with the relative literature. The influence of the concentration of CPC in the mass of the pendent drop and the process of detachment of the drop was discussed. Digitalized photograph of the detachment of the drop with different radius tips were obtained through video images. Studies of the dynamic adsorption of CPC in cationic and no-ionic resins were accomplished. It was verified that CPC is almost totally adsorbed in the cationic and no-ionic resins, and it is not adsorbed in the anionic resin. The anionic resin elute had its yt reduced indicating a potentialization of the effect of the surface active in a basic means. A study of the effect of the pH (pH=l to pH = 11) in the data of dynamic surface tension was made and it was verified that in the extremities of the pH range (1, 3 e 11) the values of yt are drastically reduced. Besides the measures of yt , the spectra of the Solutions in the range of pH studied were obtained and it was observed that there was modification in the structure of CPC in those pHs where reductions of the dynamic surface tensions had occured