Journal of Nanosciences: Pesquisa Atual

A silica/dextran/lidocaine nanocomposite (SiO/DEX/LID) was synthesized using acid-catalyzed sol-gel process. The resulting material was characterised using diffuse reflectance infrared Fourier transform spectroscopic analysis, diffusive reflectance spectroscopy in UV–Vis range, X-ray photoelectron spectroscopy and nitrogen adsorption method. LID was found to interact with the silica/dextran nanocomposite (SiO/DEX) via hydrogen bond formation between the carbonyl group of LID and SiO/DEX network. Analysis of nanocomposite with help of the series of complementary techniques ruled out the possibility of interaction between LID and the silica modified surface through the nitrogen atoms of the drug molecule. The findings reveal the potential of SiO/DEX/LID nanocomposite for being used in the preparation of medical patches for wounds and burns healing.

Colloidal metal nanoparticles are of great interest because of their use as catalysts, photocatalyst, adsorbent and sensors and because of their application in optical, electronic and magnetic devices. Capping agents are widely used in the synthesis of colloidal nanocrystals, and their roles are generally as stabilizers. A heat-treatment method for the preparation of well-stable Pt-Sn complex is demonstrated using different capping agents such as mercaptosuccinic acid (MSA), mono ethylene glycol, polyacrylic acid, and poly (vinyl pyrrolidone) etc. The stability and interaction of Pt- Sn complexes with different capping agents were characterized by UV–via absorption spectroscopy. Pt-Sn bimetallic nanoparticles have been prepared and characterized by UV–via spectroscopy.

We consider a pair of linearly coupled harmonic oscillators to explore the decoherence phenomenon induces by interaction of a quantum system with a classical environment using Feynman path’s integral method. We determine the DCHO propagator afterwards thermodynamics parameters associated to the system. We show numerically that one can reduce decoherence of a system by coupling this one to a driven harmonic oscillator or by carrying this system to the resonance.