Cosurfactant
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Physicochemical Characterizations and Antioxidant Property of Copaiba Oil Loaded into SNEDDS Systems
Self-nanoemulsion drug delivery systems (SNEDDS) represent a potential carrier to improve solubility and bioavailability of health care products. In this sense, copaiba oil (CO) loaded on cosurfactant-free SNEDDS formulations (CO-SNEDDS) were obtained by using phase diagram performed on different concentrations of constituents (oil, surfactant and water). Th
J. Braz. Chem. Soc.. Publicado em: 2019-02
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2. SBA-15 as a Support for Nickel-Based Catalysts for Polymerization Reactions
Two mesoporous SBA-15 materials with different morphologies (spherical and fiber-shaped) were synthesized and evaluated as supports for nickel-based catalysts for polymerization reactions. The supports were pretreated with trimethylaluminum (TMA), and the catalyst dibromo-bis(4-amino-2,3,5,6-tetramethylimino)acenaphthene nickel(II) was attached to the suppor
J. Braz. Chem. Soc.. Publicado em: 2018-02
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3. CHROMIUM EXTRACTION BY MICROEMULSIONS IN TWO- AND THREE-PHASE SYSTEMS
Abstract Microemulsion systems were used to remove chromium from an aqueous solution obtained from acid digestion of tannery sludge. The systems were composed by: coconut oil soap as surfactant, 1-butanol as cosurfactant, kerosene as the oil phase, and chromium solution as the aqueous phase. Two- and three-phase microemulsion extraction methods were investig
Braz. J. Chem. Eng.. Publicado em: 2015-12
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4. MICROEMULSÕES: COMPONENTES, CARACTERÍSTICAS, POTENCIALIDADES EM QUÍMICA DE ALIMENTOS E OUTRAS APLICAÇÕES
Microemulsions (MEs) are thermodynamically stable systems consisting of nanosized droplets dispersed in a solvent continuous medium (known as pseudo-phase), which is immiscible with the dispersed phase. These systems consist of water, a hydrophobic solvent called "oil," an amphiphile and often, a co-surfactant that is normally a medium chain alcohol. A large
Quím. Nova. Publicado em: 2015-11
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5. SYNTHESIS AND CHARACTERIZATION O F SODIUM METHYL ESTER SULFONATE FOR CHEMICALLY-ENHANCED OIL RECOVERY
Abstract Attention has been given to reduce the cost of surfactant by using castor oil as an alternative natural source of feedstock. A new surfactant, sodium methyl ester sulfonate (SMES) was synthesised using ricinoleic acid methyl ester, which is obtained from castor oil, for enhanced oil recovery in petroleum industries. The performance of SMES was studi
Braz. J. Chem. Eng.. Publicado em: 2015-09
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6. Thermal stability and microstructure characterization of MgAl2O4 nanoparticles synthesized by reverse microemulsion method
Magnesium aluminate (MgAl2O4) spinel nanoparticles were synthesized by reverse microemulsion process in cyclohexane by using two kinds of surfactants, n-amyl alcohol as cosurfactant and mixture of aluminic/magnesic salt aqueous solution as basic reagents. The effects of surfactant types and titration methods on the morphologies and sizes of the MgAl2O4 nanop
Mat. Res.. Publicado em: 07/05/2013
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7. Desenvolvimento e caracterização de microemulsão à base de óleo de sucupira (P. emarginatus Vog. Fabaceae) e avaliação da atividade antiinflamatória tópica / Development and characterization of oil sucupira microemulsion (P. emarginatus Vog. Fabaceae) and evaluation of topical anti-inflammatory activity
Pterodon emarginatus, popularly known as Sucupira Branca is a native species found in the Brazilian Savannahs in states of Goiás, Minas Gerais, São Paulo, Mato Grosso do Sul. Several studies have confirmed their therapeutic activities as antiinflammatory, antinociceptive, analgesic, antimicrobial, among others. The aim of this study was to develop a microe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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8. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados
The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants. Carnauba wax is the unique among the natural waxes to have a combination of properties of great importance. In previous studies it was verified the presence of metals in wax composition
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011
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9. Materials hierarchically structuralized with mesoporosa cubical phase: synthesis, characterization and use as support in the immobilization of enzyme HRP / Materiais hierarquicamente estruturados com fase cúbica mesoporosa: síntese, caracterização e uso como suporte na imobilização da enzima HRP
Hierarchical silica porous materials have been successfully synthesized using polystyrene nanospheres as macropore template, triblock copolymer Pluronic F127 as mesopore template, tetramethyl orthosilicate as silica source and ethanol as cosurfactant. The obtained materials were characterized by XRD, TG-DTA, N2 adsorption, Hg porosimetry, SEM, HRSEM, TEM and
Publicado em: 2009
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10. Estudo etnofarmacológico e fitoquímico das espécies medicinais Cleome spinosa Jacq, Pavonia varians Moric e Croton cajucara Benth
In this present work an ethnographic research was performed with 84 native medicinal specimens from the Litoral Norte Riograndense, from which two plants Cleome spinosa Jacq e Pavonia varians Moric were submitted to ethnobotanic, phytochemistry and pharmacologic investigations. Additionally, a phytopharmacological research of the medicinal specimen Croton ca
Publicado em: 2009
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11. Sistemas microemulsionados aplicados à remoção da cor de efluente têxtil
A cor do efluente resultante dos processos de tingimento tem sido um dos principais problemas ambientais enfrentados pela indústria têxtil. De modo especial, efluentes contendo corantes reativos são altamente resistentes aos processos de tratamento convencionais. Novas tecnologias têm sido buscadas, algumas já em escala industrial, porém nem sempre é
Publicado em: 2006
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12. Estudo da influência de tensoativos em sistemas microemulsionados na extração de gálio e alumínio
Gallium is an important material used in the electronic industry whose demand in the world market is increasing in view of its potential applications. A selective technique is required to allow for the production of the metal, separated from aluminium. Due to the fact that microemulsions constitute an attractive alternative to metal extraction procedures, mi
Publicado em: 2005