Interaction of anionic block copolymers with cationic surfactants and inorganic nanoparticles: structural and thermodynamic characterization

• Processo: 10/52411-6
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Data de Início da vigência: 01 de janeiro de 2011
• Data de Término da vigência: 31 de dezembro de 2012
• Área do conhecimento: Ciências Exatas e da Terra - Química - Físico-química
• Acordo de Cooperação: CNRS
• Pesquisador responsável: Watson Loh
• Beneficiário: Watson Loh
• Pesquisador Responsável no exterior: Jean-François Berret
• Instituição Parceira no exterior: Université Paris Diderot - Paris 7 , França
• Instituição Sede: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brasil
• Município da Instituição Sede: Campinas
• Vinculado ao auxílio: 09/14746-9 - Estudo do equilíbrio de fases e caracterização estrutural de sistemas formados pela associação de sais complexos de surfatantes catiônicos e polímeros aniônicos, AP.R
• Assunto(s): Fluidos complexos Tensoativos Nanopartículas Espalhamento de raios X a baixos ângulos
• Palavra(s)-Chave do Pesquisador: Core Shell Agregates | Dynamic Light Scattering | Salt Complexes | Small Angle X Ray Scattering

Resumo

This research project aims to study the electrostatic complexation in systems formed by cationic surfactants and anionic block polyelectrolytes using a recently proposed methodology by Svensson et al. (Svensson, A.; Pìculell, L.; Cabane, B.; Ilekti, P.; J. Phys, Chem. B 2002, 106, 1013) to prepare complex salts. These complex salts are formed by poly(acrylic acid)-block-poly(acrylamide) containing both symmetric and asymmetric neutral and anionic blocks and the cationic surfactants C16TAB (CTAB) e C12TAB (DTAB). The thermodynamics of the complex formation will be studied by Isothermal Titration Calorimetry (ITC) and the complex structure will be elucidated by means of Small Angle X-ray Scattering (SAXS) and Dynamic Light Scattering (DLS) measurements. The effect of added alcohols will be also investigated. Moreover, the thermodynamics involved in the complexation process between these polyelectrolytes and inorganic nanoparticles, including sub-10 nm cerium oxide nanoparticles will be studied as well as their structural characterization. In general, by comparing these results with previous investigations on similar systems performed by Berret and coworkers we aim at elucidating kinetic versus equilibrium states of these complex mixtures. In this context, this collaboration will allow the merging of current and complimentary expertise of the two proponent's research groups with potential results in expanding their capabilities in the fundamental theme of complexation and self-assembling of complex fluids. (AU)

Publicações científicas

(Referências obtidas automaticamente do Web of Science e do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores)

VITORAZI, LETICIA; BERRET, JEAN-FRANCOIS; LOH, WATSON. Self-Assembly of Complex Salts of Cationic Surfactants and Anionic-Neutral Block Copolymers. Dispersions with Liquid-Crystalline Internal Structure. Langmuir, v. 29, n. 46, p. 14024-14033, NOV 19 2013. (10/52411-6)

VITORAZI, L.; OULD-MOUSSA, N.; SEKAR, S.; FRESNAIS, J.; LOH, W.; CHAPEL, J. -P.; BERRET, J. -F.. Evidence of a two-step process and pathway dependency in the thermodynamics of poly(diallyldimethylammonium chloride)/poly(sodium acrylate) complexation. SOFT MATTER, v. 10, n. 47, p. 9496-9505, 2014. (10/52411-6)