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Lucas S. Martin,Annie Ceron,Pedro C. Oliveira,Gisella M. Zanin,Heizir F. de Castro 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Silica hybrid materials, functionalized via incorporation of three organic components: β-cyclodextrin (βCD), carboxymethyl-cellulose (CMC) and hydroxyethyl-cellulose (HEC) were synthesized by the sol–gel technique and results were compared to a well-defined matrix (silica–polyvinyl alcohol–SiO2–PVA) with respect to immobilizing Burkholderia cepacia lipase. The main objective was set to select organic components that can replace the PVA to obtain a hybrid composite with greater hydrophobic character, without compromising the remarkable features of SiO2–PVA. All the three selected compounds allowed obtaining matrices that presented similar textural and morphological properties and gave high activity (1451–1661 U g−1) and thermal stability (t1/2 > 70 h) upon immobilization. Regarding glycerol affinity, all matrices had lower ability than SiO2–PVA to adsorb glycerol, with the SiO2–βCD matrix showing the lowest affinity due to the cyclic structure of the βCD. Transesterification reactions of palm kernel oil with ethanol mediated by B. cepacia immobilized on SiO2–βCD performed in a packed bed reactor under continuous flow confirmed the efficiency of the SiO2–βCD matrix in increasing the operational stability of system, revealing a half-life (t1/2 = 1040 h), 2.5 times greater than that achieved in the same system using lipase immobilized on SiO2–PVA (t1/2 = 430 h).
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de Oliveira Letícia da S.,Fonseca Lucas P.,de Souza Renato D.,Bueno Cristina de F.,Martins Lucas M.,Scalvi Luis V.A. 한국물리학회 2022 Current Applied Physics Vol.41 No.-
Reduced graphene oxide (rGO) is deposited on glass substrate by dripping and sol-gel-coating methods giving rise to nanostructures. When in combination with thin films of SnO2, they form a heterostructure SnO2:2 at% Eu/ rGO, which alters the surface electrical conductivity. SnO2 and rGO were also combined as a composite, with conductivity strongly affected by ultraviolet excitation, and shows persistent photoconductivity (PPC) phenomenon even very close to room temperature. Both sort o hybrid structures can be applied in electronic devices. The SnO2 films are deposited via chemical route by sol-gel or by a mixed technique that combines powders generated by drying the sol-gel solution with resistive evaporation of this powder. Resistivity measured as a function of temperature show that the SnO2:2 at%Eu sample behaves very similarly to the SnO2:2 at%Eu/rGO heterostructure sample, with the same energy level for the dominant defect, 172 meV, coincident with ionization of oxygen vacancies. Despite not changing the position of this level, the presence of rGO on the surface of the SnO2 film induces a decrease in conductivity in vacuum, demonstrating the surface interaction.
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