BR – Page 5 – TechConnect Briefs

Acid-basic site detection and mapping on solid surfaces at the nanoscale, by Kelvin force microscopy (KFM)

Gouveia R.F., Bernardes J.S., Ducati T.R.D., Galembeck F., University of Campinas, BR

The present work shows, for the first time, that the electric potential pattern of acid and basic solid surfaces is modified under variable relative humidity, as determined by using Kelvin force microscopy (KFM). This allows [...]

Application of Salts Free of Chlorine as Inhibitors of Clays in Aqueous Drilling Fluids

Lucena D.V., Borges P.R., Amorim L.V., Lira H.L., UniversidadeFederal de Campina Grande, BR

At present, concern with the environment damage and the costs involved in the disposing of contaminated cuttings have led to find drilling fluids water based, but during the well drilling it is common the presence [...]

Optimizing Quantum Well Solar Cell Efficiency through Genetic Algorithms

Pacheco M.A., Pontifical Catholic University, Rio de Janeiro, BR

In this work, a study of quantum well solar cells (QWSCs) is carried through. The use of quantum wells was pointed as a tool to increase the efficiency of photovoltaic. The objective is to describe [...]

Application of Salts Free of Chlorine as Inhibitors of Clays in Aqueous Drilling Fluids

Lucena D.V., Borges P.R., Amorim L.V., Lira H.L., UniversidadeFederal de Campina Grande, BR

At present, concern with the environment damage and the costs involved in the disposing of contaminated cuttings have led to find drilling fluids water based, but during the well drilling it is common the presence [...]

Optimizing Quantum Well Solar Cell Efficiency through Genetic Algorithms

Pacheco M.A., Pontifical Catholic University, Rio de Janeiro, BR

In this work, a study of quantum well solar cells (QWSCs) is carried through. The use of quantum wells was pointed as a tool to increase the efficiency of photovoltaic. The objective is to describe [...]

Fungicidal nanoparticles of low toxicity from cationic lipid and polyelectrolytes

Melo L.D., Carmona-Ribeiro A.M., Universidade de Sao Paulo, BR

The assembly of the cationic lipid dioctadecyldimethylammonium bromide (DODAB) and polyelectrolytes such as carboxymethylcellulose (CMC) and polydiallyldimethylammonium chloride (PDDA) produced bactericidal nanoparticles in complete absence of antibiotics. In this work, these nanoparticles are evaluated regarding [...]

Supramolecular assemblies of cisplatin and polyelectrolytes: preparation, characterization and activity against cancer cells

Vieira D.B., Kim V., Petri D.F.S., Menck C.F.M., Carmona-Ribeiro A.M., Universidade de Sao Paulo, BR

Nanoformulation of cisplatin (Cis) is important to circumvent its high toxicity against normal cells. In this work, Cis cationic nanoparticles were prepared by the self-assembly of drug and oppositely charged polyelectrolytes (carboxymethylcellulose, CMC; chitosan, CH; [...]

Boron Nitride Nanotubes functionalized with glucosamine as a potential novel carrier system for radioisotope and drug delivery

Ferreira Soares D.C., Ferreira T.H., Ferreira Soares D.C., Ferreira T.H., Costa-Moreira L.M., Martins Barros de Sousa E., Centro de Desenvolvimento da Tecnologia Nuclear, BR

In the present work, Boron nitride nanotubes (BNNTs) were synthesized and submitted to a functionalization process (coating) with glucosamine. The nanostructures were physicochemical and morphologically characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Raman [...]

Bionanobots for drug delivery

Aurelio C. Pacheco M., PUC/RIO, BR

This paper describes simulations of dendrimers of generation 4, for the transport of drugs to combat tuberculosis. One of the main causes of death in patients who have HIV. We used molecular modeling of large [...]

Comparison and Critical Analysis of Experimental Results and Correlations for Thermal Conductivity of Nanofluids

Bandarra Filho E.P., Oliveira G.A., Wen D., Federal University of Uberlandia, BR

Suspensions of nanoparticles in liquids, known recently as “nanofluids,” have generated considerable interest for their potential to enhance the heat transfer in thermal systems, and reduce the possibility of erosion, sedimentation and clogging that plagued [...]