Graphite Polyurethane
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Graphite-Polyurethane Composite Electrode Modified with Molecularly Imprinted Polymer for Determination of Diclofenac
A molecularly imprinted polymer (MIP) was prepared using the anti-inflammatory diclofenac (DCF) as a template. A non-imprinted polymer (NIP) was also prepared as a control. These MIP and NIP were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET), revealing a higher porosity in the fir
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Evaluation of a Graphite-Polyurethane Composite Electrode Modified with Copper Nanoparticles as an Amperometric Flow Detector in a Wall-Jet System for the Determination of Cysteine
A graphite-polyurethane composite electrode (GPUE) was modified by electrodeposition of copper nanoparticles (CuNP) followed by electrochemical treatment in NaOH (GPUE-CuNP), in order to prepare an amperometric sensor for the determination of cysteine (Cys). Cyclic votammograms of Cys solutions at GPUE-CuNP allowed the description of a sequence of electroche
J. Braz. Chem. Soc.. Publicado em: 2020-02
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3. A New Electrochemical Platform Based on a Polyurethane Composite Electrode Modified with Magnetic Nanoparticles Coated with Molecularly Imprinted Polymer for the Determination of Estradiol Valerate in Different Matrices
A polyurethane composite electrode modified with magnetic nanoparticles (mag; Fe3O4) coated with molecularly imprinted polymers (MIPs) was developed for the electrochemical determination of estradiol valerate. Chemical and morphological analyses of the mag-MIP were performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (E
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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4. Electrochemical and Quantum Chemical Investigations of the Insecticide Fipronil
This work describes an electrochemical and quantum chemical investigation of the fipronil insecticide. Cyclic voltammetry (CV) and square wave voltammetry (SWV) experiments were performed over a graphite-polyurethane (GPU) composite electrode. The fipronil molecule presents an one-electron irreversible oxidation reaction. Profiting the SWV signal a square wa
J. Braz. Chem. Soc.. Publicado em: 2016-05
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5. Using of a graphite-polyurethane composite electrode modified with a Schiff base as a bio-inspired sensor in the dopamine determination
Um eletrodo compósito sólido à base de grafite e resina poliuretana modificado com um complexo de base de Schiff do tipo tetradentada simétrica, N, N'-bis(salicilideno)etilenodiamino de cobre(II) ([Cu(II)Salen)]), foi avaliado como sensor bio-inspirado, usando dopamina (DA) como sonda eletroquímica. O comportamento voltamétrico do modificador [Cu(II)Sa
J. Braz. Chem. Soc.. Publicado em: 2014-06
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6. Simultaneous voltammetric determination of acetaminophen and caffeine at a graphite and polyurethane screen-printed composite electrode
Um seletivo método eletroquímico foi desenvolvido para determinação individual ou simultânea de paracetamol e cafeína em tampão fosfato pH 6,0, utilizando um eletrodo compósito impresso descartável à base de grafite e poliuretana (EIGPU), em Voltametria de Pulso Diferencial (DPV). Os picos de oxidação do paracetamol e cafeína aparecem em 0,3 V e
J. Braz. Chem. Soc.. Publicado em: 2013-09
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7. Determination of tetracycline in environmental water samples at a graphite-polyurethane composite electrode
O eletrodo compósito grafite-poliuretana foi avaliado na determinação de tetraciclina (TC) em amostras de água natural. Utilizando voltametria de pulso diferencial (DPV), uma resposta linear foi observada no intervalo de 4,00-40,0 µmol L-1 com limite de detecção de 2,80 µmol L-1, sem necessidade de renovação da superfície entre medidas sucessivas.
Journal of the Brazilian Chemical Society. Publicado em: 2012-05
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8. Improvement of Soft Tooling Process Through Particle Reinforcement with Polyurethane Mould
Use of conventional flexible polymeric mould materials yields to longer solidification time of (wax/plastic) patterns in soft tooling process, thereby reducing the rapidity of the process to a great extent, which is not desirable in present competitive market. In this work, approach of particle-reinforcement with mould materials is introduced to reduce the c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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9. Voltammetric investigation and development of electroanalytical procedure for the determination of fipronil using the graphite-polyurethane composite electrode / Estudo voltamétrico e desenvolvimento de metodologia eletroanalítica para determinação do inseticida fipronil utilizando o eletrodo compósito de grafite-poliuretana
The electrochemical behavior of the insecticide fipronil, 5-amine-[(2,6-dichloro)-4-trifluoromethyl-phenyl]-4-trifluoromethyl-sulfynil-1H pyrazole-3-carbonitrile, was investigated by cyclic voltammetry, square wave voltammetry, controlled potential electrolysis and square wave stripping voltammetry using the graphite-polyurethane composite electrode. The ele
Publicado em: 2009
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10. Avaliação da potencialidade de eletrodos compósitos à base de grafite/poliuretana modificados com hexacianoferratos de Cu(II), Co(II) e Fe(III) para fins analíticos / Evaluation of the analytical potentialities fo composites electrodes based on graphite/polyurethane modified with hexacyanoferrates of Cu(II), Co(II) and Fe(III)
Eletrodos compósitos à base de grafite/poliuretana foram preparados contendo diferentes quantidades de hexacianoferratos de cobre(II), cobalto(II) e ferro(III). Os complexos foram preparados de acordo como procedimentos descritos na literatura e caracterizados por análise elementar, análise térmica e espectrometria na região do infra-vermelho. A análi
Publicado em: 2009
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11. Funcionalization of mesoporous silica with 2-bezothiazolethiol and 3-mercaptopropyltrimetoxysilane for electronalytical application / Funcionalização de sílicas mesoporosas com benzotiazol-2-tiol e 3-mercaptopropiltrimetoxisilano para aplicações em eletroanalítica
Mesoporous silicas were functionalised by immobilisation of organic substances covalently bonded to the silanol groups on the silica surface. SBA-15 nanostructured silica was functionalised by post-synthesis with 2-benzothiazolethiol and silica films modified with 3-mercaptopropyltrimethoxysilane were obtained by direct functionalisation. The characterizatio
Publicado em: 2009
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12. Determination of paracetamol at a graphite-polyurethane composite electrode as an amperometric flow detector
Um eletrodo compósito de grafite-poliuretana sem modificação foi avaliado como um detector amperométrico para análise em fluxo, na determinação de paracetamol (APAP) em formulações farmacêuticas. Uma curva analítica foi obtida com região linear entre 5,00 x 10-5 e 5,00 x 10-3 mol L-1, com um limite de detecção de 18,9 µmol L-1 e 180 determina�
Journal of the Brazilian Chemical Society. Publicado em: 2008