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Mostrando ítems 131-140 de 605
Efeito dos íons Ni2+ nas propriedades estruturais, ópticas e morfológicas do tungstato de prata
(Universidade Federal de São Carlos, 2015-07-17)
The tungstates are important compounds and known for their optical properties. In this work, solid solutions with nickel silver tungstate, 𝐴𝑔2−2𝑥𝑁𝑖𝑥𝑊𝑂4, ...
Estudo da estrutura de complexos de polieletrólitos sobre as propriedades de transporte de água e sais
(Universidade Federal de São Carlos, 2015-03-25)
Polyelectrolytes complexes (PECs) are defined as materials formed by combining oppositely charged polyelectrolytes together via ionic interaction. PECs have some unique physical properties such as non-solubility in common ...
Determinação de Cd, Co, Cr, Cu, Ni e Pb em cosméticos infantis empregando técnicas espectroanalíticas
(Universidade Federal de São Carlos, 2014-07-18)
In this study were developed two methods for sample preparation: one for children s eye shadow and another for chidren s lipstick. In the optimizing process, variables such as nitric acid concentration (2 or 7 mol L-1), ...
Estudo do efeito do envelhecimento eletroquímico em filmes de poli(3-hexiltiofeno)
(Universidade Federal de São Carlos, 2014-10-24)
The study of the electrochemical aging of conductive polymers, including of polythiophenes, has been described in the literature. However, this paper proposed study, in addition to electrochemical aging of polyethylene ...
Atividades experimentais investigativas como contribuição ao desenvolvimento de modelos mentais de conceitos químicos
(Universidade Federal de São Carlos, 2013-02-22)
In this study, during the school year, the evolution of mental models from first grade high school students about different chemical concepts was investigated by the use of experimental inquiry activities. The research was ...
Estudo empírico-teórico de compósitos baseados em polímeros condutores para conversão e armazenamento de energia
(Universidade Federal de São Carlos, 2018-10-26)
The fast obsolescence of still functional devices causes an extensive e-waste generation and an exacerbated natural resources consumption for the manufacture of new products. In this sense, the development of abundant ...
Investigação da corrosão do aço carbono AISI 1020 em soluções de NaCl utilizando microscopia óptica in situ
(Universidade Federal de São Carlos, 2016-09-23)
According to recent information from the World Corrosion Organization, annually, approximately 2.2 trillion of global GDP is spent on corrosion-related damage. These expenses are almost the GDP of the seventh world economy ...
Síntese e caracterização de nanotubos de TiO2 preparados eletroquimicamente
(Universidade Federal de São Carlos, 2016-04-20)
In the field of nanotechnology, the titanium dioxide (TiO2) has been widely studied for its optical and electrical properties. This oxide is an n-Type semiconductor and is found naturally in
different crystalline phases. ...
Estudo da variação de pH interfacial durante a reação de desprendimento de hidrogênio por simulação de elementos finitos
(Universidade Federal de São Carlos, 2012-02-27)
Different papers propose a interfacial pH variation during an electrochemical reaction. Among them, as example, can be cited the electrodeposition of Zn and Co as well as the steel corrosion in aqueous sulphide solutions. ...
Desenvolvimento de métodos analíticos utilizando laser-induced breakdown spectroscopy (LIBS) para determinação de contaminantes, macro e micronutrientes em fertilizantes
(Universidade Federal de São Carlos, 2017-02-22)
In this study analytical procedures were developed using laser-induced breakdown spectroscopy (LIBS) for determination of B, Ca, Cd, Cr, Cu, K, Mg, Mn, Na, Pb, and Zn in solid fertilizers and suspensions. Factorial designs ...