Attapulgite
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. CARACTERIZAÇÃO E VIABILIDADE DO USO DE HIDROGÉIS COMPÓSITOS POLI (ÁLCOOLVINÍLICO)/ATAPULGITA EM SISTEMAS DE LIBERAÇÃO DE FÁRMACO. / CHARACTERIZATION AND VIABILITY OF POLY (VINYL ALCOHOL)/ ATTAPULGITE COMPOSITES HYDROGELS IN DRUG DELIVERY SYSTEM.
Composites hydrogels were developed in film shape based on poly vinyl alcohol (PVA) using acidified attapulgite as crosslinking agent. The hydrogel composites were obtained in solution with amounts of attapulgite ranging from 0.05 to 2% in the polymer matrix in order to study its influence on the crystallinity, in the swelling properties and in the release o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2012
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2. Caracterização de atapulgita visando aplicação para reforço de materiais poloméricos
A atapulgita é um argilomineral do grupo das hormitas, que tem suas estruturas formadas por microcanais, que lhe conferem propriedades tecnológicas superiores a argilas classificadas industriais, esse grupo de argilas tem um leque de aplicações muito versátil, que vai de fluido de perfuração para poços de petróleo até aplicações na indústria far
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2011
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3. Morphology and thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/attapulgite nanocomposites
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - PHBV is a biodegradable polyester which has been studied as an option for the production of disposable goods. Attapulgite is a fibrous clay mineral. The aim of this work was to produce and characterize renewable resource derived-nanocomposites based on PHBV and organophilic attapulgite (MAT). The nanocomposites
Materials Research. Publicado em: 05/08/2011
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4. Utilização de argilas para purificação de biodiesel
This work describes the results of the purification of methyl biodiesel, obtained by oxidized soybean oil, using different methods. After the ester separation from the glycerin by decanting, the ester was purified each time with distillation, washing with water and adsorption with bauxite, bentonite and attapulgite. The removal of total contamination, unsapo
Química Nova. Publicado em: 2011
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5. OBTENÇÃO E CARACTERIZAÇÃO DE NANOCOMPÓSITOS À BASE DE POLIHIDROXIALCANOATO/ATAPULGITA / EXTRACTION AND CHARACTERIZATION OF NANOCOMPOSITES BASED ON POLYHYDROXYALKANOATE / ATTAPULGITE
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) PHBV is a biodegradable polyester produced by various microorganisms, which has been studied as an option for the production of disposable items in place of polymers derived from petroleum, thus contributing to the preservation of the environment. However, this thermoplastic has some disadvantages that limit its u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2010
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6. EXTRACTION AND CHARACTERIZATION OF NANOCOMPOSITES BASED ON POLYHYDROXYALKANOATE / ATTAPULGITE / OBTENÇÃO E CARACTERIZAÇÃO DE NANOCOMPÓSITOS À BASE DE POLIHIDROXIALCANOATO/ATAPULGITA
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) PHBV is a biodegradable polyester produced by various microorganisms, which has been studied as an option for the production of disposable items in place of polymers derived from petroleum, thus contributing to the preservation of the environment. However, this thermoplastic has some disadvantages that limit its u
Publicado em: 2010
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7. Argilas especiais: o que são, caracterização e propriedades
Special clays are a group of clays different from the large volume of clay mineral products named "Industrial Clays": kaolins, ball clays, refractory clays, bentonites, fuller's earths, common clays. Two groups of special clays exist: rare, as in the case of hectorite and sepiolite and restricted areas, as in the case of white bentonite, halloysite and palyg
Química Nova. Publicado em: 2007-02
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8. Experimental studies with palygorskite dusts.
As the preliminary results of experimental studies on dust from the palygorskite group have led to some confusion a detailed description of the completed investigation is given for clarification. As in other experiments the biological effects have been shown to be associated with the physical characteristics of the fibres in these specimens. Samples of sepio
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9. Sister chromatid exchanges in rat pleural mesothelial cells treated with crocidolite, attapulgite, or benzo 3-4 pyrene.
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10. Adhesion of the clay minerals montmorillonite, kaolinite, and attapulgite reduces respiration of Histoplasma capsulatum.
The respiration of three phenotypes of Histoplasma capsulatum, the causal agent of histoplasmosis in humans, was markedly reduced by low concentrations of montmorillonite but was reduced less by even higher concentrations of kaolinite or attapulgite (palygorskite). The reduction in respiration followed a pattern that suggested saturation-type kinetics: an in
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11. Interactions between clay minerals and siderophores affect the respiration of Histoplasma capsulatum.
The reduction in the respiration of Histoplasma capsulatum in broth culture caused by montmorillonite appeared to be the result, in part, of the interference by the clay with the iron nutrition of the fungus. This interference was apparently the result of the adsorption by the clay of the iron-transporting siderophore (deferricoprogen B) produced by the fung
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12. Potential health risks from the use of fibrous mineral absorption granulates.
Attapulgite (palygorskite) and sepiolite are fibrous clay minerals used commercially as components in a wide variety of products including oil and grease adsorbents, carriers for pharmaceuticals, cosmetics, and pesticides. They are also components of drilling muds and animal litter and they are used as paint thickeners. The current annual worldwide productio