Micellization
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Insights on Structuration of Peroxotungstic Acid in Aqueous Media
Recent studies on tungsten oxide preparation are mainly motivated by its applications in smart windows, energy harvesting and, recently, in cancer therapy. Peroxotungstic acid (PTA) is an important precursor to obtain tungsten oxide in an environmentally-friendly way, through the colloidal synthesis in aqueous media. Despite giving chemically pure products,
J. Braz. Chem. Soc.. Publicado em: 2019-04
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2. Effect of Acetonitrile and N,N-Dimethylformamide on the Formation of Poly(ethylene oxide)-Sodium Alkyl Sulfate Aggregates
The effects of low contents of acetonitrile (AN) or N,N-dimethylformamide (DMF) on the aggregation of sodium alkyl sulfate surfactants, in the absence and presence of poly(ethylene oxide) (PEO), were investigated using conductivity and isothermal titration calorimetry. The cosolvents slightly changed the critical micellar concentrations and did not alter the
J. Braz. Chem. Soc.. Publicado em: 2018-01
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3. INIBIÇÃO À CORROSÃO DE AÇO-CARBONO EM MEIO SALINO PELO HETEROCICLO ISATINA VEICULADO EM MICROEMULSÕES
Polar microemulsion systems (SME) based on saponified coconut oil (OCS) as surfactant were prepared in order to increase the solubility of the heterocycle isatin (IST) aiming at its application as corrosion inhibitor against AISI 1020 mild steel, in saline medium. The adsorptions phenomena of the tested SME systems (SME-OCS1-IST and SME-OCS2-IST) in the liqu
Quím. Nova. Publicado em: 2017-08
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4. Novos surfactantes alquil poliglicosídicos à base de amilose extraída da batata inglesa (Solanum tuberosum L.)
Alkyl polyglycosides (APGs) are new biodegradable surfactants, non-toxic, synthesized from abundant renewable sources, potentially more appropriate than anionic surfactants. A range of glycosides denoted APG-Cy was synthesized by the Köenig-Knorr reaction using C10, C16 and C18 alcohols and derived from the degradation of amylose from English potato. The mo
Quím. Nova. Publicado em: 2017-04
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5. MOLECULAR THERMODYNAMICS OF MICELLIZATION: MICELLE SIZE DISTRIBUTIONS AND GEOMETRY TRANSITIONS
Abstract Surfactants are amphiphilic molecules that can spontaneously self-assemble in solution, forming structures known as micelles. Variations in temperature, pH, and electrolyte concentration imply changes in the interactions between surfactants and micelle stability conditions, including micelle size distribution and micelle shape. Here, molecular therm
Braz. J. Chem. Eng.. Publicado em: 2016-09
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6. SÍNTESE E CARACTERIZAÇÃO DE SURFACTANTES ALQUILFENIL POLIGLICOSÍDICOS A PARTIR DA AMILOSE E ALQUIL FENÓIS EXTRAÍDOS DO LCC NATURAL
The surfactants were synthesized by condensing the obtained oligosaccharides of amylose and alkyl phenols extracted from the natural cashew nut shell liquid (nCNSL). The Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR) data showed aromatic ring bands, glycosidic rings, olefins and paraffins. The Nuclear Overhauser Effect Sp
Quím. Nova. Publicado em: 2016-08
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7. Estudo termodinâmico de associação de surfatantes zwitteriônicos e sua interação com polímeros através de titulação calorimétrica / Thermodynamic study of zwitterionic surfactants self-assembly and its interaction with polymers by calorimetry titration
As sulfobetaínas (SB) são uma classe de surfatantes zwitteriônicos. A presença de grupos carregados tanto positiva quanto negativamente na mesma molécula concede à sua cabeça polar uma hidrofilicidade intermediária entre surfatantes iônicos e não-iônicos. O estudo termodinâmico de associação da série homóloga de sulfobetaínas, bem como sua i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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8. Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium
Mixed micellization and surface properties of cationic and nonionic surfactants dimethyl decyl-, tetradecyl- and hexadecyl phosphineoxide mixtures are studied using conductivity and surface tension measurements. The models of Rubingh, Rosen, and Clint, are used to obtain the interaction parameter, minimum area per molecule, mixed micelle composition, free en
Química Nova. Publicado em: 2011
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9. Thermodynamics of micellization of alkylglucosides in H2O and D2O / Termodinamica de micelização de alquilglicosideos em H2O e em D2O
Alquilglicosídeos (AG) são surfatantes não-iônicos totalmente provenientes de fontes naturais e renováveis, além de serem totalmente biodegradáveis e atóxicos. Neste trabalho estudou-se a termodinâmica de micelização desta classe de surfatantes através das técnicas de calorimetria diferencial de varredura (DSC) e titulação calorimétrica isot�
Publicado em: 2007
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10. Síntese e propriedades de soluções de tensoativos catiônicos derivados de (3-dimetilaminopropil)amidas de ácidos carboxílicos / Synthesis and solution properties of cationic surfactants derivated from fat acids of (3-dimethylaminopropyl)amides.
The following surfactants have been synthesized: benzyl-(3-acyl-aminopropyl)dimethylammonium chloride, RCONH(CH ind.2 ) ind.3 N pot.+ (CH ind.3 ) ind.2 CH ind.2 C ind.6 H ind.5 Cl pot.- and (3-acylaminopropyl) trimethylammonium chloride, RCONH(CH ind.2 ) ind.3 N pot.+ (CH ind.3 ) ind.3 Cl ind.- , where RCO = C ind.10 to C ind.16 . The two series have been sy
Publicado em: 2002
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11. Influence of lipid chain unsaturation on melittin-induced micellization.
It is well known that melittin, an amphipathic helical peptide, causes the micellization of phosphatidylcholine vesicles. In the present work, we conclude that the extent of micellization is dependent on the level of unsaturation of the lipid acyl chains. We report the results obtained on two systems: dipalmitoylphosphatidylcholine (DPPC), containing 10(mol)
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12. Membrane solubilization by a hydrophobic polyelectrolyte: surface activity and membrane binding.
We have previously observed that the hydrophobic polyelectrolyte poly(2-ethylacrylic acid) solubilizes lipid membranes in a pH-dependent manner, and we have exploited this phenomenon to prepare lipid vesicles that release their contents in response to pH, light, or glucose (Thomas, J. L., and D. A. Tirrell. Acc. Chem. Res. 25:336-342, 1992). The physical bas