Electrostatic Potential
Mostrando 13-24 de 250 artigos, teses e dissertações.
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13. Selective Adsorption of AuIII from Aqueous Solution Using 2,5-Dimercapto-1,3,4-thiadiazole Modified Persimmon Tannin
A one-pot synthesized persimmon tannin (PT)-based novel biosorbent modified with 2,5-dimercapto-1,3,4-thiadiazole (DMTD) was prepared for the selective adsorption of AuIII from aqueous mixtures. The synthesized biosorbent was designated as DMTD-PT and characterized using elemental analysis, zeta potential, Fourier transform infrared (FTIR) spectroscopy and X
J. Braz. Chem. Soc.. Publicado em: 2018-07
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14. Evaluation of the influence of fluoroquinolone chemical structure on stability: forced degradation and in silico studies
ABSTRACT Fluoroquinolones are a known antibacterial class commonly used around the world. These compounds present relative stability and they may show some adverse effects according their distinct chemical structures. The chemical hydrolysis of five fluoroquinolones was studied using alkaline and photolytic degradation aiming to observe the differences in mo
Braz. J. Pharm. Sci.. Publicado em: 14/05/2018
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15. Characterization of the interactions between chitosan/whey protein at different conditions
Abstract This research investigated the interaction between chitosan and whey protein molecules in terms of pH and heating. The FTIR, rheological analysis, turbidity, and zeta potential measurements were used to assess this interaction. At pH 4.0, addition of low amount chitosan with chitosan/whey protein isolate (C/WPI) ratio of 1:5 effectively prevented t
Food Sci. Technol. Publicado em: 16/04/2018
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16. Humic Acid as Dispersant of an Alumina Suspension and its Rheological Behaviour
Humic acid was extracted and employed as a dispersant in an alumina suspension. The higher zeta potential for HA (-42 mV) was measured at pH 11 showing that an electrostatic repulsion might occur in the alumina/HA suspension. As a consequence of the long chain molecules of HA it was also expected a steric effect on deflocculation. The best dispersion conditi
Mat. Res.. Publicado em: 15/01/2018
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17. ESTUDIO COMPUTACIONAL DE LA INTERACCIÓN N∙∙∙C EN SISTEMAS MOLECULARES (R)NN-CO2 (N=1,2,3)
The structures and molecular interactions of (R)nN-CO2 complexes of amines and CO2 in the gas phase were computationally studied by using ab-initio methods and quantum theory of atoms in molecules (QTAIM). The analysis of the electrostatic potential showed that the interaction N∙∙∙C present in this type of aggregates is favored by the potential differe
Quím. Nova. Publicado em: 2017-09
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18. Diferenciando grados de sofisticación epistémica durante la resolución de un problema de electrostática
Abstract: The present paper presents a case study in which an analysis is carried out on the production of three introductory physics students while solving an electrostatic problem at college level. The objects under study are students' personal epistemologies, which enable them, and everyone, to deal with their own knowledge in different ways when confront
Ciênc. educ. (Bauru). Publicado em: 2017-03
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19. Green Synthesis of Gold Nanoparticles Using Sumac Aqueous Extract and Their Antioxidant Activity
Green synthesis of nanoparticles which have eco-friendly favourable solvent systems and environmentally reducing agents is of excessive importance. In this paper, we aimed to develop environmentally friendly, rapid and simple producer for the synthesis gold nanoparticles (Au-NPs) using aqueous extract of sumac as reducing agents for gold ions as well capping
Mat. Res.. Publicado em: 22/12/2016
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20. Multifunctional Imidazole-Derived Polymeric Catalyst for Dephosphorylation Reactions Potentiated by Cationic and Anionic Micelles
Results confirm the catalytic potential of imidazole groups anchored on the polymeric backbone of polyvinylimidazole (PVI) in dephosphorylation reactions with di- and tri-phosphoesters, promoting impressive enhancements up to 107-fold. We propose the imidazole groups on PVI react by nucleophilic catalysis (neutral specie) with a phosphate triester and bifunc
J. Braz. Chem. Soc.. Publicado em: 2016-02
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21. O ESTADO DA ARTE DA LIGAÇÃO DE HIDROGÊNIO
Along the historical background of science, the hydrogen bond became widely known as the universal interaction, thus playing a key role in many molecular processes. Through the available theoretical approaches, many of these processes can be unveiled on the basis of the molecular parameters of the subject intermolecular system, such as the variation of bond
Quím. Nova. Publicado em: 2015-12
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22. ASSOCIATION OF BRANCHED POLYETHYLENE IMINE WITH SURFACTANTS IN AQUEOUS SOLUTION
Three polymer-surfactant systems comprised of branched polyethylene imine (PEI) with an anionic surfactant (sodium dodecylsulfate; SDS), a cationic surfactant (tetradecyltrimethylammonium bromide; TTAB), and a zwitterionic surfactant (
N -tetradecyl-N ,N -dimethyl-3-ammonio-1-propanesulfonate; SB3-14) were stQuím. Nova. Publicado em: 2015-07
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23. Effect of solution concentrations on the morphology of nylon6/66 nanofibrous yarns by blown bubble-spinning
In this paper, a novel method called blown bubble-spinning was employed to produce nanofibers. Compared with the traditional technologies, such as melt blowing and electrospinning, hot airflow is used in blown bubble-electrospinning to overcome the surface tension of the polymer bubbles and to pull multiple jets from the broken bubble into nano scale ones wh
Matéria (Rio J.). Publicado em: 2014-12
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24. An accurate novel coupled field Timoshenko piezoelectric beam finite element with induced potential effects
An accurate coupled field piezoelectric beam finite element formulation is presented. The formulation is based on First-order Shear Deformation Theory (FSDT) with layerwise electric potential. An appropriate through-thickness electric potential distribution is derived using electrostatic equilibrium equations, unlike conventional FSDT based formulations whic
Lat. Am. j. solids struct.. Publicado em: 2014