On the reversed crystal growth of BaZrO3 decaoctahedron: shape evolution and mechanism

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Radio luminescence properties of decaoctahedral BaZrO3

Radioluminescence (RL) emissions were obtained for the BaZrO3 self-assembled nanocrystals under decaoctahedral shape, if produced via microwave-assisted hydrothermal method. Trapped F centers created within the band gap are the result of order-disorder effects, which act as key factors supporting significant RL emission through a detrapping process. The influences of size and morphology on RL properties are take into account. No radiation damage or loss of emission intensity was observed. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Supramolecular assemblies of cis-palladium complexes dominated by C-H center dot center dot center dot Cl interactions

Two cis-related palladium(II) complexes [PdCl(2)(PPh(3))(tu)] (1) and [PdCl(2)(tmen)] (2) {PPh(3) = triphenylphosphine, tu = thiourea, tmen = N,N,N,N-tetramethylethylenediamine} have been synthesized and characterized by elemental analysis, IR and NMR spectroscopies, and single crystal X-ray diffraction. In 1, N-H center dot center dot center dot Cl hydrogen bonds are responsible for the formation of a dimer which connects to an adjacent one through weak C-H center dot center dot center dot Cl interactions, yielding 1D tapes. The crystal packing of compound 2 consists of zigzag ribbons of [PdCl(2)(tmen)] self-assembled by C-H center dot center dot center dot Cl hydrogen bonds which also holds the chains together, giving rise to a 2D layered structure. (C) 2006 Elsevier B.V. All rights reserved.

Studies on the interaction between humic substances and conducting polymers for sensor application

The interaction between humic substances and poly(o-ethoxyaniline) (POEA), a conducting polymer, was investigated for both solution and self-assembled films. The results have shown that the humic substances induce a doping of POEA by protonation, as indicated by UV-Vis and Raman spectroscopies. The atomic force microscopy (AFM) studies on the self-assembled films have shown that the average roughness of the polymer film has increased after exposing it to humic substances (fulvic and humic acids), consistent with the interaction between POEA and humic substances. However, this change in morphology is reversible by washing the films with water in agreement with the electrical data allowing using this system in sensor applications. Here, the sensor formed by an array of different sensing units was able to detect and distinguish humic substances in aqueous solution, as shown by multivariate analysis (principal component analysis). The motivation to detect humic substance comes due to its importance in terms of quality control of water or soil. ©2005 Sociedade Brasileira de Química.

Electrogravimetric Analysis by Quartz-Crystal Microbalance on the Consumption of the Neurotransmitter Acetylcholine by Acetylcholinesterase

Electrogravimetric analysis was performed on the consumption of the neurotransmitter Acetylcholine (ACh) by Acetylcholinesterase (AChE) in situ and in real time. Michaelis-Menten assumption was achieved by using an enzyme micro-reactor in which the total enzyme was anchored in a quartz crystal microbalance chip (QCM-chip) with a strategically engineered self-assembled monolayer (SAM) of alkanethiols, which can prevent diffusion-controlled or spatially restricted kinetics. The real-time frequency changes indicated the rate of the products formation from enzymatic reaction. The QCM-chip was tested showing that it could demonstrate AChE inhibition by physostigmine. © 2013 Copyright Taylor and Francis Group, LLC.

Interação do peptídeo MP-I com micela de SDS em solução aquosa: um estudo por dinâmica molecular

Pós-graduação em Biofísica Molecular - IBILCE

Fabricação de microcanais para integração de uma língua eletrônica em um sistema lab-on-a-chip

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Obtenção e caracterização de filmes nanoestruturados de polianilina/látex de borracha natural

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo da afinidade das proteínas rTgMIC1 e rTgMIC4 da Toxoplasma gondii com fetuína e asialofetuína utilizando técnica piezelétrica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Crescimento de fibras de zircônia preparadas pela rota sol-gel a partir de moldes de cristal líquido

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Construção de genossensor amperométrico para diagnóstico da hepatite C baseado em monocamadas auto montadas e detecção não marcada

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Síntese e estudo estrutural de polioxometalatos: propriedades e aplicações

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo de processos redox enzimáticos confinados em eletrodos pelo concomitante monitoramento da variação de massa e da corrente: o caso da penicilinase como modelo

Pós-graduação em Biotecnologia - IQ

Espécies metalo-supramoleculares discretas polinucleares: sínteses e caracterização

Pós-graduação em Química - IQ

Penicillinase-based amperometric biosensor for penicillin G

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)