Browsing Teses e dissertações by Title
Now showing items 748-767 of 1065
-
Modificação superficial de óxidos : proposta de um modelo simples e sua aplicação em sistema aluminazircônia
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 18/07/2008)In this study a model that makes possible to foresee the limit of modifier oxide of surface that results in the complete support coating with a unit cells monolayer was proposed. From such limit, the lattice of the modifying ... -
Modulation of semiconductors with transition metals: morphological, optical, and electronic properties.
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 25/07/2024)Research on semiconductors has been of great interest due to their numerous applications. These materials are versatile, and doping, which introduces impurities into the crystal structure, is a common strategy that can ... -
Monitoramento de um processo de lixiviação de cobre em placas de circuito impresso por meio da análise direta de sólidos e uso de Laser-Induced Breakdown Spectroscopy (LIBS)
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 03/12/2021)This PhD thesis was developed at CTI Renato Archer, Campinas-SP and was based on a hydrometallurgical process, on an industrial scale, applied to the recovery of metals in discarded printed circuit boards (PCBs). The ... -
Morfologia e propriedades estruturais de óxidos metálicos complexos: um enfoque teórico e experimental
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 18/07/2018)Design, control and direct characterization of the properties of the surfaces are prerequisites for all practical applications of (nano) materials. Within this context, the present doctoral thesis is an experimental and ... -
Multicomponent approach to silica-grafted peptide catalysts : A 3 D continuous-flow organocatalytic system with on-line monitoring of conversion and stereo-selectivity
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 28/11/2014)The derivatization of organocatalysts with functional appendages suitable to anchor onto solid supports is usually achieved by stepwise syntheses. As an alternative to such a strategy, this work describes a one-pot approach ... -
Multicomponent combinatorial synthesis of proplyl peptide-lipopeptoid hybrid catalyst: application in the asymmetric Michael addition under aqueous environment
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 29/11/2018)This study describes the synthesis of a new library of prolyl peptides-lipopeptoid hybrids catalysts through a multicomponent combinatorial approach. For the design of this catalyst library, we took into consideration the ... -
Multicomponent reactions in the discovery of organocatalysts and the diversification of organocatalytic approaches
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 19/06/2015)This thesis reports the development of multicomponent approaches directed to specific objectives: a) the discovery of new and efficient peptide-based catalyst for asymmetric transformations and b) the synthesis of ... -
O museu de ciências como promotor da motivação: lembranças do público do setor de química do CDCC/USP
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 30/05/2014)This work refers to a study of the motivational aspects found in the mini courses offered by the Chemistry Sector of the Center for Cultural and Scientific Dissemination (Centro de Divulgação Científica e Cultural CDCC). ... -
Nano-microencapsulados de extrato de Azadirachta indica usando ligninas do bagaço de cana-de-açúcar: estabilidade e eficácia contra insetos pragas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 25/07/2014)The present work aimed the development of a model bioinsecticide for pest insect control using microencapsulated botanical extracts of Azadirachta indica (neem), and natural polymer of lignins, witch were extracted from ... -
Nanocarreadores biopoliméricos de isoflavonas de soja e óleos essenciais: potencial dermocosmético, fotoprotetivo e antimicrobiano
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 08/12/2023)With the emergence of healthier and more conscious lifestyles, the cosmetics market has undergone a significant shift in chemical reformulation and technological planning. Plant extracts and essential oils stand out, as ... -
Nanocompósito de PP/PP-g-AM/argila organofílica: processamento, propriedades mecânicas, termo-mecânicas e de permeação de gás
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 28/08/2009)The aim of present work was developing nanocomposites of polypropylene (PP) with organoclay (MMT) in the presence of a compatibilization agent (PP-g-MA) in the melt state. The masterbatch of PP-g-MA and organoclay was ... -
Nanocompósitos de polietileno linear de baixa densidade (LLDPE)/argila montmorilonita: processamento, morfologia e propriedades
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 25/06/2013)Polymer nanocomposites filled with lamellar silicates are considered hybrid materials (organic-inorganic) of great interest both in industry and the universities, since their properties are superior to neat polymer. In ... -
Nanocompósitos magnéticos à base de zeólita obtida a partir da casca de arroz para adsorção de polifenóis da indústria do vinho
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 22/12/2023)In recent years, the wine sector has presented considerable growth, resulting in increased production and, consequently, an increase in the effluents generated during winemaking. Polyphenols stand out among the components ... -
Nanocompósitos na forma de fibras poliméricas à base de policaprolactona com hidrotalcita imobilizada para a adsorção de ácido clorogênico
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 25/08/2023)Water, vital for humanity, is widely used in coffee processing, resulting in effluents with a high organic load, including polyphenols that can be harmful to the environment. Adsorption is a simple and effective strategy ... -
Nanocompósitos para a liberação controlada de compostos triazínicos aplicados como defensivos agrícolas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 02/08/2013)This research proposed a preparation method for a nanocomposite, able to control the delivery of high quantities of an active compound, inserted on its matrix, in order to prospect an application for the controlled delivery ... -
Nanocristais de TiO2 : relação entre parâmetros morfológicos, estruturais e fotocatálise
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 26/02/2010)In this work, morphologically different TiO2 nanocrystals were synthesized through the OPM method with the objective of performing a comparative study related to photoactivity. Morphological characterization was performed ... -
Nanoemulsões de óleos essenciais: mecanismos de estabilidade e interação com pectina em bionanocompósitos para aplicação em embalagens ativas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 22/03/2019)Microbial growth is among the challenges impairing food preservation and shelf-life. Essential oils (EO) featuring antimicrobial and antioxidant activities denote an alternative for lessening the contents of synthetic ... -
Nanoestructured catalysts for organic reactions: design, synthesis and applications
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 29/07/2016)The development of more efficient and selective catalysts actively contributes for the design of safer, cleaner and less energy-demanding processes, and, therefore, catalysis is one of the cornerstones of green chemistry. ... -
Nanoestruturas de óxido de cobre obtidas por novo método hidrotermal de microondas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, Câmpus São Carlos, 08/12/2006)Synthesis and characterization of Copper Oxide nanostructured by means of hydrothermal assisted by microwaves were studied in this work. The thermal treatment device was set up by using a domestic microwave oven and ... -
Nanomateriais organofuncionalizados e suas aplicações em catálise: associando as vantagens da catálise homogênea com as da heterogênea
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Química - PPGQ, , 14/06/2013)We have immobilized proline, like prolinamide, by using flash chromatography with commercial grade silica and magnetite nanoparticles that were synthesized in our lab. The degree of functionalization has been determined ...