Surfactant Phase Diagram
Mostrando 1-11 de 11 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. Reciclagem de material asfáltico fresado utilizando solventes e microemulsões
With the increase of asphalt milling services was also a significant increase in recycling services pavements. The techniques used today are basically physical processes in which the milled material is incorporated into new asphalt mixtures or executed on site, with the addition of virgin asphalt and rejuvenating agent. In this paper seeks to analyze the eff
Publicado em: 2010
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3. Desenvolvimento, caracterizaÃÃo e estudo de permeaÃÃo cutÃnea de diclofenaco de dietilamÃnio em sistemas tÃpicos nanoemulsionados
The nanoemulsions (NE) are transparent, isotropic and thermodynamically stable systems, formed spontaneously under a specific set of experimental conditions from mixtures of water and oil phases stabilized by a surfactant or a mixture of surfactant and cosufactant. Because of their properties, especially the ability to carry lipophilic and hydrophilic drugs
Publicado em: 2008
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4. Changes in aggregate form, size and flexibility along phase sequences in lyotropic liquid crystals
A comparison is made between existing theories for self-assembling systems and experimental phase diagrams of complex systems made up of amphiphile/water/additives, with emphasis on phase transitions by changes in concentration. Evidence for different types of hexagonal (H) phases, in systems with detergent and lipid amphiphiles, are reviewed. It is shown th
Brazilian Journal of Physics. Publicado em: 2002-06
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5. DNA-lipid systems: A physical chemistry study
It is well known that the interaction of polyelectrolytes with oppositely charged surfactants leads to an associative phase separation; however, the phase behavior of DNA and oppositely charged surfactants is more strongly associative than observed in other systems. A precipitate is formed with very low amounts of surfactant and DNA. DNA compaction is a gene
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-05
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6. Diagrama de fases do sistema brometo de cetiltrimetilamonio - silicato de tetrametilamonio - agua
The molecular sieves of the M41S family have been studied since their discovery in 1992, however, the mechanism of their formation is not yet very clear. In this work, a phase diagram for the system cetyltrimethylammonium bromide (CTAB)/tetramethylammonium silicate/water has been constructed, in order to obtain basic information on the interactions that exis
Publicado em: 2002
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7. Microemulsões a base de óleos vegetais: formação, propriedades e emprego na descontaminação EX-SITU de Solo / Vegetable oil-based microemulsions: formation, properties and application for "exsitu" soil decontamination
In the present project, we were interested in assessing the use of Brazilian vegetable oils in the "ex-situ" decontamination of soils from polycyclic aromatic hydrocarbons (PAHs). In this process, contaminated soil is treated with a microemulsion (µE) composed of water (W) /commercial non-ionic surfactant (S) C9/11EO4 /oil (O). The latter term refers to the
Publicado em: 2000
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8. SELF-ASSEMBLY AND COMPLEX PHASE BEHAVIOUR IN THE AMMONIUM PENTADECAFLUOROOCTANOATE / WATER / AMMONIUM CHLORIDE SYSTEM.
The ammonium pentadecafluorooctanoate in heavy water system (APFO/\ pot.2\ H\ ind.2\ O) exhibits exceptional phase behaviour stemming from strong tendency of the surfactant to form disc-like micelles which are stable over a wide concentration and temperature intervals. An understanding of this phase behaviour requires exposing the factors which govern the st
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 199609
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9. Characterization of microemulsion structures in the pseudoternary phase diagram of isopropyl palmitate/water/Brij 97:1-butanol
This research was aimed to characterize microemulsion systems of isopropyl palmitate (IPP), water, and 2∶1 Brij 97 and 1-butanol by different experimental techniques. A pseudoternary phase diagram was constructed using water titration method. At 45% wt/wt surfactant system, microemulsions containing various ratios of water and IPP were prepared and identif
Springer-Verlag.
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10. Formulation development and optimization using nanoemulsion technique: A technical note
Ramipril nanoemulsion formulations were successfully prepared by the spontaneous emulsification method (titration method). Sefsol 218 was selected as the oil phase for the development of the formulation on the basis of the solubility studies. The differences in the droplet size between the formulations selected from the phase diagram was not statistically si
Springer-Verlag.
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11. Partition coefficient of a surfactant between aggregates and solution: application to the micelle-vesicle transition of egg phosphatidylcholine and octyl beta-D-glucopyranoside.
The mechanism of the solubilization of egg phosphatidylcholine containing 10% (M/M) of egg phosphatidic acid unilamellar vesicles by the nonionic detergent, octyl beta-D-glucopyranoside, has been investigated at both molecular and supramolecular levels by using fluorescence and turbidity measurements. In the lamellar region of the transition, the solubilizat