Fabio José Esper
University of São Paulo
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Featured researches published by Fabio José Esper.
Materials Science Forum | 2010
Guillermo R. Martín Cortés; Adriana A. Silva; Kleberson R. O. Pereira; Fabio José Esper; Lisiane Navarro de Lima Santana; Wildor Theodoro Hennies; Francisco Rolando Valenzuela-Díaz
The organo-clays have important industrial uses between others are: rheological additives for drilling fluids in oil bases, inks, glues, lubricants and cosmetics. At the moment and in a growing way, these materials are considered as important reinforcement fillers in the structuring of nano-composites clays/polymers. They are obtained by the smectite clay reaction with quaternary ammonium salts. In this work an organophillic clay sample prepared by a dry process at the PMT – EPUSP – Metallurgic and Materials Engineering Department of the Polytechnic School at the University of São Paulo, had been characterized basically by techniques of XRD, IR, Thermal Analysis, and by swell capacity of the clays in some oils and organic solvents.
Materials Science Forum | 2010
Guillermo R. Martín Cortés; Ticiane Sanches Valera; Fabio José Esper; Wildor Theodoro Hennies; Francisco Rolando Valenzuela-Díaz
Smectites are clay mineral with a layered structure and nanometric thickness, high specific area and a huge variety of uses. Consisting on stacked layers of about 1nm thickness, including two silica tetrahedral and one octahedral sheet. Properties of natural Smectites can be enhanced by organic modification, due to the substitution of the exchangeable cations in the interlayer area. In fact, the properties of the modified smectite (organophilic clay) are related to its modified chemical composition and structural parameters. The interaction of smectite clays with surfactants has an important interest in the fields of drilling fluids, paints, cosmetic, ceramic industries and others. Recent applications are: remediation of contaminated areas and polymer/clay nanocomposites. The aim of this paper is to obtain organophilic clays using a bentonite from the Chiqui Gómez deposit in Central Cuba. The raw and organophilic clays were analyzed by DRX, SEM, swelling capacity in organic solvents and others.
Characterization of Minerals, Metals, and Materials | 2015
Guillermo Ruperto Martín-Cortés; Fabio José Esper; Antonio J. Santana de Araujo; Wildor Theodoro Hennies; Maria das Graças da Silva Valenzuela; Francisco Rolando Valenzuela-Díaz
Seeking to replace carbon-black as filler of rubber in the production of vulcanized goods, researchers from University of Sao Paulo have studied different materials types as minerals, vegetal or wastes agricultural and industry. Results of rubber composites filled with MA1 a waste of mineral treatment provided by Esper Industries are presented. MA1 was characterized through X-ray diffraction; Thermal analysis; Scanning Electronic Microscopy; and others laboratory methods. The composite and shaped masses were evaluated by these methods plus their mechanical properties such as tensile strength, elongation at break and hardness. Exceptional results were obtained in the mechanical properties evaluated, better than those obtained with the traditional carbon-black. Seeing the kind of material used as filler, it can conclude that the environmental benefit is present, as well as economic development, giving credibility to the use of these alternative material in replacement carbonblack.
Characterization of Minerals, Metals, and Materials | 2015
M. Gonzales-Fernandes; Fabio José Esper; M. G. Silva-Valenzuela; G. R. Martín-Cortés; Francisco Rolando Valenzuela-Díaz; Hélio Wiebeck
Natural rubber/organophilic clay nanocomposites were prepared and characterized. A brown bentonite from Paraiba’s State, Brazil was modified with a sodium salt and treated with quaternary ammonium salt hexadecyltrimethyl ammonium chloride. The clay in its natural state, after cation exchange with sodium and after organophilization was characterized by XRD, IR, SEM, thermal analysis. Nanocomposite samples were prepared containing 10 resin percent of organophilic clay. The vulcanized samples were analyzed by XRD, SEM. The nanocomposites obtained showed improvement in their mechanical properties in comparison with samples without clay.
Materials Science Forum | 2012
Guillermo Ruperto Martín-Cortés; Fabio José Esper; Wildor Theodoro Hennies; Giorgio de Tomi; Francisco Rolando Valenzuela-Díaz
The use of vulcanized rubber products is widely spread in the industry and in the society. Tires, shoes, tennis and other are examples of it. Most of the raw materials used in the formulations of vulcanized rubber products come from the synthesis of natural raw materials consuming time and energy and also generating CO2 emissions during the respective transforming processes. The main reinforcing material used in rubber formulations is the carbon-black which is a petroleum derivative obtained by the incomplete burning of the fossil fuel. This paper show some results obtained after replacing all or part of the carbon-black by carbonaceous nanoparticle minerals in rubber formulations.
Materials Science Forum | 2012
Hélio Wiebeck; Francisco Rolando Valenzuela-Díaz; Fabio José Esper; Guillermo Ruperto Martín-Cortés; Wildor Theodoro Hennies; Marcus V.V. Costa
The advantage of the incorporation of tire rubber powder and rice husk ash in the polymer compound is mainly due to the reduction of the products cost, as well as improving the essential properties for a great processing of the material, for example, its flow into a hole of a thin wall mold. The rice husk ash can replaces the carbon black in the new products, contributing with the improvement of the environment and the economy of the society. Main objectives of this work are: enhance the applications of the ashes from the rice husk and the waste from the tire rubber, as well as, study new methods of recycling of polymeric wastes, to incorporate an aggregated value to the recycled materials as well as obtaining compounds or nanocompounds materials.
Macromolecular Symposia | 2016
Daniel Kersting; Hélio Wiebeck; Fabio José Esper
Revista Iberoamericana de Polímeros | 2015
Daniel Kersting; Hélio Wiebeck; Fabio José Esper
Supplemental Proceedings: Materials Processing and Interfaces, Volume 1 | 2012
Fabio José Esper; Guillermo Ruperto Martín-Cortés; Luiz Sãlvio Galvão Dantas; Adriana Cutrim; Wildor Theodoro Hennies; Francisco Rolando Valenzuela-Díaz
Supplemental Proceedings: Materials Processing and Interfaces, Volume 1 | 2012
Guillermo Ruperto Martín-Cortés; Fabio José Esper; Luiz Sãlvio Galvão Dantas; Wildor Theodoro Hennies; Francisco Rolando Valenzuela-Díaz