A systematic study of the formation of mesostructured silica using surfactant ruthenium complexes in high- and low-concentration regimes

Long-range ordered lyotropic liquid crystals in intermediate-range ordered protic ionic liquid used as templates for hierarchically porous silica

“…The introduction of methanol to the starting reaction mixture promoted the homogenous mixing of TMOS and the template, which has also been used in aqueous liquid templating processes in the literature. 49 Due to the different properties of the starting materials, segregation was likely to occur in the initial mixture. EAN possesses both non-polar and polar domains.…”

“…A similar procedure was also used to prepare liquid crystal templated silica in an aqueous system to remove the by-product (methanol). 49 The mixture was placed in a climatic oven with a preset temperature of 45 C and relative humidity of 20% for the completion of hydrolysis and condensation reactions. After it was aged at this temperature for seven days, the PIL and organic components were extracted by ethanol and then water in a sealed environment overnight.…”

Surface-Induced Crystallization of Sodium Dodecyl Sulfate (SDS) Micellar Solutions in Confinement

“…Inevitable variations in temperature, and particularly cooling, can reduce the solubility of surfactants, leading to formation of crystals, hence compromising the long-term stability and overall performance of such micellar suspensions. − Cooling crystallization is of special concern particularly for systems whose minimum solubility temperature is near room temperature (∼20 °C) for typical concentrations used in formulated products (5–30 wt%) . Well-known surfactants in this category include cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS), which are widely used in detergent formulations, pharmaceutical products, − and bio- − and nanotechnology − processes.…”

Estudos espectroscópicos de sistemas luminescentes hóspede/hospedeiro

“…De maneira geral, uma matriz hospedeira apropriada deve prover uma estrutura sólida capaz de encapsular o emissor, prevenindo agregação molecular e evitando processos de migração de espécies responsáveis pela sua degradação ou desativação dos seus estados excitados. 1,14,[40][41][42][43] Este problema tem sido abordado através da dispersão destes emissores em matrizes poliméricas, 39,44,45 em argilas multicamadas, 46,47 ou por sol-gel, em processos de auto montagem de micro-e nano-partículas, 27,43,48,49 por dissolução no sol e posterior condensação do material híbrido, 1,43,50 por impregnação úmida em matrizes mesoporosas, [51][52][53][54] ou por processos de funcionalização da matriz e posterior ligação covalente do centro luminescente. 27,33,52,55 Alternativamente, pesquisadores têm se dedicado a modificar os grupos formadores dos corantes ou dos grupos substituintes dos ligantes dos complexos que atuam como espaçadores moleculares, 8,35,56,57 como agentes polimerizantes, 14,58 e/ou como grupos transportadores de carga.…”