Colloidal Dispersion
Mostrando 1-12 de 46 artigos, teses e dissertações.
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1. EVALUATION OF SILICA NANOPARTICLE COLLOIDAL STABILITY WITH A FIBER OPTIC QUASI-ELASTIC LIGHT SCATTERING SENSOR
Abstract Colloidal silica is an important biocompatible, inert and non-toxic material for imaging, therapy, and drug delivery biomedical applications. In this context, the evaluation of colloidal suspensions and their stabilities by a Fiber Optic Quasi-Elastic Light Scattering sensor is proposed. Two different silica nanoparticles were prepared and character
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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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. Influência da concentração dos monômeros de acrilato e metacrilato de hidroxipropila na copolimerização em emulsão do estireno com acrilato de n-butila e acrilonitrila para produção de adesivos.
RESUMO Monômeros acrílicos contendo grupos hidroxila são frequentemente empregados na produção de polímeros, especialmente para aplicações em diferentes substratos ou mesmo em reações posteriores de modificação química com grupos isocianato ou carboxila. Este trabalho tem como objetivo estudar o efeito da concentração dos monômeros de acrilat
Matéria (Rio J.). Publicado em: 16/09/2019
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4. Analysis of Styrene Polymerization Without Surfactant and N2 Gas in Cylindrical Flask.
The conditions of chemical synthesis can be crucial for polymerization of styrene in such a way that it can be produced latex beads at nanometric range (ϕ < 400nm). In this work, it will be analyzed how the absence of N2 and surfactant will result in colloidal particles with high affinity to agglomerate forming two kinds of nanostructured assemblies: colloi
Mat. Res.. Publicado em: 22/01/2018
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5. Humic Acid as Dispersant of an Alumina Suspension and its Rheological Behaviour
Humic acid was extracted and employed as a dispersant in an alumina suspension. The higher zeta potential for HA (-42 mV) was measured at pH 11 showing that an electrostatic repulsion might occur in the alumina/HA suspension. As a consequence of the long chain molecules of HA it was also expected a steric effect on deflocculation. The best dispersion conditi
Mat. Res.. Publicado em: 15/01/2018
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6. Studies of the Colloidal Properties of Superparamagnetic Iron Oxide Nanoparticles Functionalized with Platinum Complexes in Aqueous and PBS Buffer Media
This work has focused on the synthesis of three nanosystems composed of superparamagnetic iron oxide nanoparticles (SPIONs) coated either with a carboxylate platinum(IV) complex (PD = cis,cis,trans-[Pt(NH3)2Cl2(HOOCCH2CH2COO)(OH)]) or with platinum(II) complex functionalized dextrans (DexPt1 = [Pt(Dex-NH2)Cl3] and DexPt2 = [Pt(Dex-NH2)(NH3)2(H2O)]). All nano
J. Braz. Chem. Soc.. Publicado em: 2017-05
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7. COMPETITION BETWEEN THE REACTION MEDIUM AND NANOSTRUCTURED ZnO IN THE PHOTOCATALYTIC DEGRADATION OF ANTHRACENE. TOWARD AN OPTIMAL PROCESS FOR POLYCYCLIC AROMATIC HYDROCARBONS REMEDIATION
Contamination with polycyclic aromatic hydrocarbons (PAHs) is considered an important health issue due to the toxicity of these compounds. Photocatalytic degradation of anthracene, a representative molecule of PAHs, using the high quantum yield semiconductor ZnO, has been reported. The solubility of anthracene in water makes necessary to use mixtures with or
Quím. Nova. Publicado em: 2017-01
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8. Chemo-Rheological Behavior of Aqueous Titanium Carbide Suspension and Evaluation of the Gelcasted Green Body Properties
Gel-casting is an advanced colloidal processing method for fabricating ceramic green parts. In this project acrylamide-based monomers were used as a gelcasting system. The effects of tetramethylammonium hydroxide and polyethylenimine dispersants on the premix solution containing titanium carbide powder have been studied via observation of the zeta potential
Mat. Res.. Publicado em: 12/12/2016
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9. Otimização reológica de suspensões aquosas de óxido de ferro (III)
In this work the dispersion of iron oxide III particles in aqueous media was studied. To achieve the maximum solid content zeta potential measurements were carried as a function of pH. The influences of two different types of polyacrylates as dispersants were investigated. Suspensions were produced by varying solids concentration up to 30 vol.%. The results
Matéria (Rio J.). Publicado em: 2015-03
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10. Colloidal Dispersion Stability: Kinetic Modeling of Agglomeration and Aggregation
In this work we present a simple model for the kinetics of agglomeration and aggregation of colloidal particles. We consider that particles agglomerate rapidly and endothermically forming oligomers. These oligomers can, in turn, aggregate irreversibly, in a process that leads to the destabilization of the colloidal system. As these two processes have very di
J. Braz. Chem. Soc.. Publicado em: 2015-02
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11. DEVELOPMENT OF INSULATING MAGNETIC OIL FOR TRANSFORMERS
The Centrais Elétricas do Norte do Brasil AS – Eletronorte, as well as other companies in the world energy sector, have problems of loss of the performance by excessive heat and even accidents with their transformers. The maintenance and accidents impact of energy supply, generating profit and more expensive insurance premiums. The transformers are essent
Publicado em: 20/07/2014
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12. INSERÇÃO DE NANOPARTÍCULAS METÁLICAS EM RESINA EPÓXI: estudos espectroscópicos. / INSERTION OF METAL NANOPARTICLES IN EPOXY RESIN: spectroscopic studies.
This work describes the production and characterization of colloidal solution of silver nanoparticles (AgNPs) and insertion of this colloidal solution in a polymeric ma-trix of epoxy resin. The first stage of this work was the preparation of AgNPs in colloi-dal solution, using AgNO3 as the precursor, ethylene glycol as a medium and dispersant sodium citrate
Publicado em: 2011