Interlayer
Mostrando 1-12 de 64 artigos, teses e dissertações.
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1. Structural Characteristics of Lignite Char from Different Pyrolysis Reactors and the Influence on Their Gasification Reactivity
The gasification reactivity of coal char is affected by numerous experimental variables, and char structure is one of the dominant factors. In this work, Raman spectroscopy, powder X-ray diffraction (XRD), and N2 adsorption were used to investigate the physical and chemical structure of char prepared under different pyrolysis conditions. Three kinds of pyrol
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Factorial design applied to sodium activation of a Brazilian bentonite
Resumo Bentonitas sódicas são muito utilizadas na indústria por possuírem propriedades específicas desejáveis para diferentes finalidades, como inchamento, tixotropia, e capacidade de troca catiônica elevados. Por outro lado, bentonitas cálcicas e policatiônicas, predominantes no Brasil, necessitam de beneficiamento químico através da ativação s
Cerâmica. Publicado em: 06/06/2019
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3. Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?
ABSTRACT Ferralsols ( Latossolos ) should contain few or no 2:1 clay minerals and have low potassium (K) contents, and consequently low levels of non-exchangeable K forms are expected. The aim of this study was to evaluate how the clay mineralogy of a Ferralsol affects the soil K dynamics in response to K fertilization during cropping and whether the clay mi
Rev. Bras. Ciênc. Solo. Publicado em: 15/04/2019
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4. Effects of the Structure and Composition of Montmorillonite on the Dimerization of Unsaturated Fatty Acids
The effects of structure and composition of different montmorillonites on their catalytic performance in the dimerization of unsaturated fatty acids were investigated. The dimerization reaction was performed at 240 ºC for 3 h, with montmorillonite as catalyst, and LiCl as the co-catalyst. The results showed that the specific surface areas of the different m
J. Braz. Chem. Soc.. Publicado em: 2018-07
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5. ORGANOFILIZAÇÃO E SILANIZAÇÃO DE ARGILA BENTONITA
Clays have been used in several technological areas. One of the most usual applications is their incorporation into organic materials. Nonetheless, natural clays are hydrophobic being incompatible with organic medium. Clay organophilization can be reached by several methods such as by exchange of the interlayer sodium cations by organic cations, and by silan
Quím. Nova. Publicado em: 2018-02
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6. Improved Method for Preparation of Methoxy-Modified Kaolinite
A hydrated kaolinite-methanol intercalation compound (Kaol-MeOH (hydrated)) was synthesized by utilizing kaolinite/dimethyl sulfoxide intercalation compound (Kaol-DMSO) as an intermediary, and further displacement intercalation with butyl trimethylammonium chloride (BTAC) was also carried out. The obtained samples were characterized by X-ray diffraction (XRD
J. Braz. Chem. Soc.. Publicado em: 2018-01
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7. Influence of Si Coating on Interfacial Microstructure of Laser Joining of Titanium and Aluminium Alloys
A common phenomenon in the dissimilar joints is the presence of brittle compounds in the joining interface region. The brittle phases can decrease by introduction of interlayers in the joining interface, such as silicon, that inhibits the formation of Al3Ti and AlTi3 phases in joining process between titanium and aluminium alloys. In the present work, the jo
Mat. Res.. Publicado em: 09/11/2017
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8. Preparation of Zinc Oxide-Nanoclay Hybrids by Alkaline Ion Exchange Method
Abstract ZnO/nanoclay hybrids are synthesized by a single-step solid-state reaction using ZnCl2 as a reagent. These hybrids were prepared by a simple alkaline ion exchange method, without using any surfactant or chelating agents. By adjusting the reagent’s immersion time in molten salt, production of pure ZnO/nanoclay hybrids was achieved. Synthesized hybr
Braz. J. Chem. Eng.. Publicado em: 2017-10
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9. PHB/Bentonite Compounds. Effect of Clay Modification and Thermal Aging on Properties
Poly(3-hydroxybutyrate) (PHB) was compounded with three different Bentonite clays: natural, purified by ultrasound/sonicated and organically modified with hexadecyltrimethylammonium bromide. PHB/Bentonite masterbatches with 30% clay were prepared in a laboratory internal mixer and letdown with pure matrix to 1% and 3% w/w clay. Test samples were injection mo
Mat. Res.. Publicado em: 21/08/2017
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10. Synthesis of Vanadium Interface for HFCVD Diamond Deposition on Steel Surface
Laser cladding of vanadium carbide powder developed an interlayer on AISI D6 steel as a diffusional barrier and to relief thermal residual stress. Laser cladding experiments varied resolution (DPI) and scanning speed (mm/s). CVD diamond deposition on this interface went on by HFCVD technique. The coatings were characterized by X-ray diffraction analysis (XRD
Mat. Res.. Publicado em: 06/07/2017
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11. Diamond Films on Stainless Steel Substrates with an Interlayer Applied by Laser Cladding
The objective of this work is the Hot Filament Chemical Vapor Deposition (HFCVD) of diamond films on stainless steel substrates using a new technique for intermediate barrier forming, made by laser cladding process. In this technique, a powder layer is irradiated by a laser beam to melt the powder layer and the substrate surface layer to create the interlaye
Mat. Res.. Publicado em: 06/03/2017
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12. Confinement of a Nonionic Surfactant Membrane Within a Montmorillonite as a New Way to Prepare Organoclay Materials
The aim of this study was to prepare and characterize a hybrid layered material (organoclay) with a Na-montmorillonite and the triethylene glycol mono-n-decyl ether (C10E3) nonionic surfactant which forms a lamellar phase at room temperature. The synthesized organoclay was characterized by complementary techniques (Fourier transform infrared spectroscopy and
Mat. Res.. Publicado em: 29/09/2016