Colloidal Chemistry
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. SÍNTESE E CARACTERIZAÇÃO DE PONTOS QUÂNTICOS AMBIENTALMENTE AMIGÁVEIS, UM MEIO SIMPLES DE EXEMPLIFICAR E EXPLORAR ASPECTOS DA NANOCIÊNCIA E NANOTECNOLOGIA EM CURSOS DE GRADUAÇÃO
Nanotechnologies and nanomaterials are very current and interesting topics and can be used as interdisciplinary tools in education. They can be used to work in a practical and interesting way with lots of subjects. In chemistry teaching it can be particularly important to consolidate the nanomaterials, nanotechnology and characterization teaching. Among the
Quím. Nova. Publicado em: 2020-06
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2. Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review.
Abstract: Since its inception in 2007, the Colloidal Materials Group, one of the research groups in nanotechnology of the Institute of Chemistry of São Carlos (IQSC) at University of São Paulo (USP) carries out studies related to the development of syntheses methods of nanoparticles and multifunctional nanostructured systems. Our works search new synthesis
An. Acad. Bras. Ciênc.. Publicado em: 28/11/2019
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3. METODOLOGIAS DE SÍNTESE EM FASE LÍQUIDA PARA A OBTENÇÃO DE NANOMATERIAIS INORGÂNICOS À BASE DE TERRAS RARAS
Liquid phase synthesis techniques are commonly preferred for the preparation of nanosized inorganic solids due to several advantages over other methodologies, such as low energy consumption, safety, possibility of reactant recovery and, mainly, the homogeneity of the precursors and control of particle sizes and morphologies through bottom-up approaches. I
Quím. Nova. Publicado em: 2015-06
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4. Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol)
The main goal of this work was to synthesize CdSe/CdS (core-shell) nanoparticles stabilized by polymer ligand using entirely aqueous colloidal chemistry at room temperature. First, the CdSe core was prepared using precursors and acid-functionalized poly(vinyl alcohol) as the capping ligand. Next, a CdS shell was grown onto the CdSe core via the layer-by-laye
Mat. Res.. Publicado em: 09/05/2014
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5. Wet end chemistry in papermaking - interactions in solid-liquid interfaces. / Química da parte úmida em processo de fabricação de papel - interações em interfaces sólido-líquido.
Um polieletrólito catiônico (poliamina), com baixo peso molecular e elevada densidade de carga, normalmente aplicado como agente coagulante do lixo aniônico, foi usado para estudos de retenção e drenagem na fabricação de papel. O uso do carboximentil celulose de sódio para simulação do teor de lixo aniônico e seu efeito na retenção de cargas min
Publicado em: 2010
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6. Processamento Coloidal de Cromito de Lantânio / LANTHANUM CHROMITE COLLOIDAL PROCESSING
Lanthanum chromite (LaCrO3) is currently the most studied material for applications such as solid oxide fuel cell interconnector (HTSOFC). The complexity of microstructures and geometries of HTSOFC devices, require a precise control of processing parameters to get the desired combination of properties and this, the use of techniques involving concentrated ce
Publicado em: 2009
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7. Singularities related to the electrosteric stabilization mechanism and their effects over the rheological behaviour of concentrated suspensions. / Singularidades associadas ao mecanismo de estabilização eletroestérico e seus efeitos sobre o comportamento reológico de suspensões concentradas.
O presente projeto de trabalho buscou avaliar e estabelecer relações de causa e efeito que justificassem a ocorrência de singularidades no comportamento reológico de formulações complexas contendo elevada carga de sólidos em suspensão incorporada. O mecanismo de estabilização coloidal empregado para preparação das formulações e posterior análi
Publicado em: 2008
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8. Estudo das propriedades estruturais locais de fluidos magnéticos : da nanopartícula à dispersão
Local structural properties of magnetic fluids based on nanosized particles of zinc, copper or nickel ferrite are investigated. Nanograins prepared by a soft chemistry method are dispersed in acidic medium thanks to a core-shell strategy that prevents the particles from dissolution. Their chemical composition is no longer homogeneous and they can be describe
Publicado em: 2007
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9. Desenvolvimento de processo e produtos para controle de substâncias em estado coloidal (stickies) na produção de papel reciclado / Development of processes and products for controlling the colloidal substances (stickies) in production of the recycled paper
Nos últimos anos, as fábricas de papel estão utilizando, cada vez mais, fibras secundárias na produção de papel. Em conseqüência deste fator, associado ao fechamento de circuito de água, é provocado um acúmulo de substâncias dissolvidas e coloidais (SDC) na água branca, que podem aglomerar-se, formando depósitos ou contaminantes denominados sti
Publicado em: 2007
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10. The Casimir effect: some aspects
We start this paper with a historical survey of the Casimir effect, showing that its origin is related to experiments on colloidal chemistry. We present two methods of computing Casimir forces, namely: the global method introduced by Casimir, based on the idea of zero-point energy of the quantum electromagnetic field, and a local one, which requires the comp
Brazilian Journal of Physics. Publicado em: 2006-12
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11. O pKa de indicadores ácido-base e os efeitos coloidais
An experiment is proposed that can be included in undergraduate courses of chemistry. The subject is the acidity of organic compounds, which are employed as pH indicators, particularly in acid-base titrations. The indicators used are methyl orange, bromophenol blue and bromocresol green in aqueous medium. The influence of colloidal systems on the equilibrium
Química Nova. Publicado em: 2006-06
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12. SÃntese e caracterizaÃÃo de nanocristais luminescentes baseados em semicondutores II-VI para fins de aplicaÃÃo como biomarcadores
In this work we present synthetic procedures in aqueous medium for the obtention of luminescent II-VI (CdS/Cd(OH)2 and CdTe/CdS) semiconductor nanocrystals. These methodologies, based on colloidal chemistry, resulted in particles with a size average of 8,5 nm for the CdS/Cd(OH)2 system and 3,8 nm for the CdTe/CdS system. The optical properties of these mater
Publicado em: 2006