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Previous issue date: 2014-09-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Os complexos polieletrol?ticos nanoparticulados foram obtidos usando quitosana e poli(metacrilato de s?dio). A forma??o dos complexos foi avaliada por turbidimetria, condutometria, viscosimetria e espalhamento din?mico da luz. A presen?a de excesso de cargas positivas pode ser evidenciada atrav?s da an?lise do potencial zeta. O di?metro das part?culas foi caracterizado pela t?cnica de espalhamento din?mico da luz e a morfologia por microscopia de for?a at?mica. Em todos os experimentos uma mudan?a abrupta de comportamento foi evidenciada no intervalo de raz?o molar (grupos carboxilato/amino) entre 0,7-0,8. Essas mudan?as de comportamento puderam ser relacionadas com uma proposta de mecanismo de forma??o dos complexos polieletrol?ticos, baseada na redu??o das dimens?es macromoleculares dos aglomerados de complexos polieletrol?ticos sol?veis seguidos de segrega??o de fase. / Polyelectrolyte complexes (PECs) nanoparticles were prepared using chitosan and sodium
polymethacrylate. The complex formation was investigated using turbidimetry,
conductometry, viscometry, and dynamic light scattering. The presence of excess positive
charges was evidenced by zeta potential measurements. The particle diameter was
characterized by dynamic light scattering and the morphology by atomic force microscopy.
In all experiments an abrupt change in behavior was observed at a carboxyl:amino molar
ratio around 0.7?0.8. Those changes in behavior were related to a proposed mechanism of
complex formation based on the decrease of macromolecular dimensions of soluble
polyelectrolyte complex clusters, followed by phase segregation
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19423 |
| Date | 05 September 2014 |
| Creators | Stopilha, Roberta Talita |
| Contributors | 90623207753, http://lattes.cnpq.br/8143800826985556, Wanderley Neto, Alcides de Oliveira, 00738841463, http://lattes.cnpq.br/4789528535524269, Nunes, Juliana de Souza, 05245655462, http://lattes.cnpq.br/6612004116272109, Fonseca, Jos? Luis Cardozo |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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