Hydrophobic Adsorption
Mostrando 25-36 de 110 artigos, teses e dissertações.
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25. Synthesis of sol-gel aluminas : correlation of the textural, structural, morphological and chemical properties of aluminas with reactivity in the catalytic epoxidation of olefins / Sintese de aluminas sol-gel : correlação das propriedades texturais, estruturais, morfologicas e quimicas da alumina com a reatividade na epoxidação catalitica de olefinas
Epoxidation is a pivotal transformation for organic synthesis of fine and bulk chemicals. The aim of this research is the replacement of stoichiometric oxidative processes or non-environmental friendly catalytic processes by economically sustainable catalytic reactions of oxygen transfer using non-toxic catalysts and oxidants. The alumina/aqueous 70 wt. % H2
Publicado em: 2006
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26. Concentration of alpha-lactalbumin from cow milk whey through expanded bed adsorption using a hydrophobic resin
The design of novel applications for the use of new high-density adsorbents in the direct recovery of proteins requires analysis of the fluid dynamics and mass transfer characteristics of the column used with the solid-liquid system. In this article we describe the operating parameters related to the use of a high-density, hydrophobic resin (Streamline® Phe
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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27. Use of thin films obtained by plasma polymerization for grain protection and germination enhancement
In this work, preliminary results of the use of hydrophobic thin films obtained by plasma deposition to protect grains and seeds are presented: grains coated by the films did not present biological degradation when stored in a saturated water vapor environment, but had their germination accelerated in the presence of water. A model that explains the differen
Química Nova. Publicado em: 2005-12
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28. ADSORÇÃO DE UM ÁCIDO GRAXO UTILIZADO EM FLOTAÇÃO POR VERMICULITA HIDROFÓBICA
In this work are presented studies to evaluate the adsorption capacity of the expanded vermiculite mineral and of the vermiculite hydrophobized mineral originating from the states of Piauí and Goiás with different size. Tests of adsorption were accomplished in direct contact systems with oil, contact with solution oil-water that simulates oil spilling in t
Publicado em: 2005
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29. Separação e purificação do ácido clavulânico através de extração líquido-líquido seguida de adsorção em coluna de leito fixo.
A study was made of the extraction of clavulanic acid (CA) from a fermented medium and its concentration and purification, based on a comparison of two liquid-liquid extraction methods, followed by adsorption in a fixed bed column containing resins (hydrophobic polymeric resin and ion exchange resin). The extraction and adsorption steps proposed here were ev
Publicado em: 2005
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30. Interaction between biomolecules and solid surfaces / Interação entre a enzima enolase e superfícies sólidas
This work aimed to compare the adsorption behavior of enolase (2-phospho-D- glycerate hydrolase) onto hydrophilic (silicon wafers and amino-terminated surfaces (APS)) and hydrophobic planar substrates (polystyrene (PS) film, TMCS). The effect of the substrate shape (planar x spherical) was also studied. The spherical substrates were glass beads, native and m
Publicado em: 2004
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31. Adsorption of human immunoglobulin G onto ethacrylate and histidine-linked methacrylate
The adsorption of human IgG onto GMA (a semirigid methacrylate-based chromatography matrix) and His-GMA adsorbents was studied by chromatography and batch equilibrium binding analysis. IgG molecules adsorbed onto GMA gel by nonspecific hydrophobic interactions and the specificities were similar for both adsorbents. Adsorption data were analyzed using three i
Brazilian Journal of Chemical Engineering. Publicado em: 2003-09
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32. Scanning electron microscopy study of protein immobilized on SIO2 Sol-gel surfaces
Uniform attachment of enzymes to solid surfaces is essential in the development of bio and optical sensor devices. Immobilization by adsorption according to hydrophilic or hydrophobic nature is dependent on the charges and defects of the support surfaces. Sol-gel SiO2 densified glass surfaces, frequently used as supports for protein immobilization, are evalu
Brazilian Journal of Chemical Engineering. Publicado em: 2003-09
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33. Interações entre bicamadas lipídicas e interfaces hidrofóbicas / Interactions between lipid bilayers and hydrophobic interfaces
Determinations of surface tension (γ) at the air--water interface, contact angles (Θ), and in and ex-situ ellipsometric mean thickness (d) were used to study the interaction between dioctadecyldimethylammonium bromide (DODAB) small vesicles and spin-coated polystyrene sulfate (PSS) films on silicon wafers. Upon the adition of NaCl (50 mM final conc
Publicado em: 2003
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34. Cationic bilayers over silica: adsorption and colloidal stability at low ionic strength / Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica
The study of adsorption of model-membranes on the surface of solid partic1es is an important line of research in rapidly developing research areas such as biosensors design, building up of immunological kits or design ofbiocompatible materiais. In this work, interactions between hidrophilic silica particles and cationic liposomes made up of dioctadecyldimeth
Publicado em: 2003
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35. Separação de ampicilina produzida enzimaticamente por reação entre éster metílico de fenilglicina e ácido 6-aminopenicilânico.
The separation/concentration process of the products obtained from the enzymatic synthesis of ampicillin (AMP) catalyzed by immobilized penicillin G acylase was the focus of this Thesis. Hydrophobic resin adsorption and isoelectric precipitation were the processes herein evaluated. The antibiotic was produced in the solid phase, from 6-aminopenicillanic acid
Publicado em: 2003
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36. Sorção, imobilização e extração de polissiloxanos em silicas porosas para uso em cromatografia liquida de alta eficiencia
This work investigated the phenomena responsible for the adsorption and immobilization that occurs between the silica pores and poly(metiloctilsiloxano) (PMOS), used as stationary phase in High Performance Liquid Chromatography (HPLC) in the reversed phase. Through kinetic, spectroscopic and chromatographic studies, was verified that, after preparation of th
Publicado em: 2002