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Immobilization of Gold and Silver on a Biocompatible Porous Silicone Matrix to Obtain Hybrid Nanostructures

Journal of Biomaterials and Nanobiotechnology 2018年第1期9卷 41-50页

作者： Solano-Umana Victor corrales urena yendry regina Vega-Baudrit Jose Roberto Hologic Surgical Products Costa Rica AlajuelaCosta Rica National Laboratory of Nanotehcnology(LANOTEC-CeNAT-CONARE) San JoseCosta Rica

During the last decade an enormous research effort has been deployed with respect to porous materials. Design, pore size, shape, morphology and density are crucial features for increasing the surface area of silicone materials, aiming for a better biological response so cells can adhere and grow. Many medical applications utilize polydimethylsiloxane (PDMS) in medical implants, despite its hydrophobic surface that does not stimulate cellular adhesion. Porosity and morphology are important factors in the wettability of PDMS, but modifying the hydrophobic surface functionalization is required. To achieve this goal, the use of coatings with gold and silver nanoparticles or nanofilms can be used as a strategy to improve biocompatibility. This is due to the effect on mammalian cell adhesion and proliferation related to gold nanoparticles, as well as the prevention of infections related to silver nanoparticles. In this study, the pores in the silicone matrix were formed using sugar crystals as a template agent, and later passed through a lixiviation process to form a porous silicon matrix. Next, the matrix was placed inside a colloidal suspension;a process that allowed the immobilization of these particles on the surface matrix. A hybrid stable material was synthetized through this process. The water absorption level of the porous silicone matrix with and without the nanoparticles was determined. The water uptake of the matrix was higher when the nanoparticles were immobilized on the surface. Van der Waals and hydrogen bonding interactions account for this, promoting the retention of a higher concentration of water molecules. Higher water uptake has been identified as being a key factor for improving biological response, cellular adhesion and growth, which accelerates implant integration in the body.

关键词： Silicone Porous Gold Silver Water Absorption

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Instantly Investigating the Adsorption of Polymeric Corrosion Inhibitors on Magnesium Alloys by Surface Analysis under Ambient Conditions

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Journal of Surface Engineered Materials and Advanced Technology 2014年第5期4卷 282-294页

作者： Livia M.Garcia Goncalves Larissa C.Sanchez Stephani Stamboroski yendry R.corrales urena Welchy Leite Cavalcanti Jorg Ihde Michael Noeske Marko Soltau Kai Brune Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM BremenGermany CAPES Foundation Ministry of Education of BrazilBrasiliaBrazil Department of Materials Engineering UFSCarFederal University of Sao CarlosSao CarlosBrazil Department of Chemistry UFSCFederal University of Santa CatarinaFlorianopolisBrazil UNESP Sao Paulo State University Sao PauloBrazil Straetmans High TAC GmbH HamburgGermany

Surface engineering of magnesium alloys requires adequate strategies, processes and materials permitting corrosion protection. Liquid formulations containing corrosion inhibitors often are to be optimized according to the demands of the respective substrate and following the service conditions during its application. As an interdisciplinary approach, a combination of several techniques for instantly monitoring or elaborately analyzing the surface state of magnesium was accomplished in order to characterize the performance of new adsorbing sustainable amphiphilic polymers which recently were developed to facilitate a multi-metal corrosion protection approach. The application of established techniques like Contact Angle measurements and X-ray Photoelectron Spectroscopy investigations was supplemented by introducing related and yet faster online-capable and larger-scale techniques like Aerosol Wetting Test and Optically Stimulated Electron Emission. Moreover, an inexpensive setup was configured for scaling the inset and the extent of degradation processes which occur at local electrochemical circuits and lead to hydrogen bubble formation. Using these analytical tools, changes of the surface state of emeried AM50 samples were investigated. Even in contact with water, being a moderate corrosive medium, the online techniques facilitated detecting surface degradation of the unprotected magnesium alloy within some seconds. In contrast, following contact with a 1 weight% formulation of a polymeric corrosion inhibitor, surface monitoring indicated a delay of the onset of degradation processes by approximately two orders of magnitude in time. Mainly based on the spectroscopic investigations, the corrosion inhibiting effects of the investigated polymer are attributed to the adsorption of a primary polymer layer with a thickness of a few nanometers which occurs within some seconds. Immersion of magnesium for several hours brings up a protective film with around ten nanometers th

关键词： Online Surface Monitoring Magnesium Alloys Polymeric Corrosion Inhibitors Fast Screening of Effective Formulations Optimization of Application Process

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