Hydrides
Mostrando 1-12 de 20 artigos, teses e dissertações.
-
1. Experimental Investigation of Isobaric specific heat capacity (Cp) of 9-ethylcarbazole in liquid and solid state
ABSTRACT Liquid organic hydrides, e.g. 9-ethylcarbazole, are potentially interesting hydrogen storage materials because of their reversible hydrogen sorption properties. In this study, the isobaric specific heat capacity of 9-ethylcarbazole in solid and liquid phases was investigated using adiabatic calorimeter. The experimental setup consisting of two basic
Matéria (Rio J.). Publicado em: 10/06/2019
-
2. Stress effects on the kinetics of hydride formation and growth in metals
Abstract Although metal hydrides are considered promising candidates for solid-state hydrogen storage, their use for practical applications remains a challenge due to the limitation imposed by the slow kinetics of hydrogen uptake and release, which has driven the interest in using metal nanoparticles as advanced materials of new hydrogen-storage systems sinc
Lat. Am. j. solids struct.. Publicado em: 22/10/2018
-
3. Effect of blisters and rims on radial hydride precipitation in fuel elements under dry storage conditions
ABSTRACT Hydrogen enters in Zry clads during fuel element life in service; when hydrogen exceeds the terminal solid solubility, circumferential hydrides are precipitated. In the presence of thermal gradients, produced for instance by oxide spallation, localized concentration of hydrides - known as blisters - can be formed. Due to the fact that zirconium hydr
Matéria (Rio J.). Publicado em: 19/07/2018
-
4. Síntesis y propiedades de electrodos de níquel/grafeno para generación de hidrógeno
ABSTRACT The use of nanomaterials, such graphene oxide (GO), as blocks for the synthesis of hybrid materials has been extensively studied in recent years. In this paper a simple and reproducible method for the synthesis of hybrid nickel/graphene electrodes is presented. This method involves the modification of a conventional electroplating nickel bath by inc
Matéria (Rio J.). Publicado em: 19/07/2018
-
5. Obtención de compuesto de titanio con gradiente de porosidad mediante técnica pulvimetalúrgica
ABSTRACT Within the study of biomaterials for implantological use titanium is among the most widely employed metals due to its excellent corrosion and mechanical resistance. In spite of the advances made, there are some issues remaining with the value of the elastic moduli of the titanium (110GPa) in comparison with the elastic moduli of the cortical bone (2
Matéria (Rio J.). Publicado em: 19/07/2018
-
6. Synthesis of Organotin Substituted Tricyclic Macrodiolides
The radical addition of triorganotin hydrides, R3SnH (R =n-butyl, phenyl, neophyltin), to four unsaturated diesters of (11R,12R)-9,10-dihydro-9,10-ethaneanthracene-11,12-dimethanol leads to products of cyclohydrostannation with an average yield of around 80%. Whereas the addition of these hydrides to diacrylate and dimethacrylate leads to the expected mixtur
J. Braz. Chem. Soc.. Publicado em: 2016-03
-
7. Development of mg alloys in bulk forms for hydrogen storage / Desenvolvimento de ligas de Mg em formas maciças para armazenagem de hidrogênio
In the present work, bulk magnesium metallic hydrides (MgH2 and Mg2FeH6) were produced. Commercially pure Mg and mixtures of 2Mg-Fe were processed by severe plastic deformation (SPD) by using High Pressure Torsion (HPT) method, and also by hot extrusion. Studies were accomplished with relationship to the possibility of bulk hydrides production from those mat
Publicado em: 2010
-
8. A topologia molecular QTAIM e a descrição mecânico-quântica de ligações de hidrogênio e ligações de di-hidrogênio
Hydrogen bonds formed through the interaction between a high electronic density center (lone electron pairs, π or pseudo-π bonds) and proton donors cause important electronic and vibrational phenomena in many systems. However, it was demonstrated that proton donors interact with hydrides, such as alkali and alkaline earth metals (BeH2, MgH2, LiH and NaH),
Química Nova. Publicado em: 2010
-
9. Diastereosseletividade na redução de enonas bicíclicas com hidretos volumosos
Reduction of five substituted octalones employing lithium tri-sec-butylborohydride (L-selectride®) in THF and ethyl ether led to allylic alcohols with moderate diastereoselectivity. The stereoselectivity of addition of bulky hydrides showed to be different from most examples in the literature and was strongly influenced by substitution on the octalone ring.
Química Nova. Publicado em: 2008
-
10. Sistemas Nanoestruturados: Heteroestruturas Quasi-Periódicas de Nitretos e Cálculos Ab initio em Polimorfos CaCO3 / Sistemas Nanoestruturados: Heteroestruturas Quasi-Periódicas de Nitretos e Cálculos Ab initio em Polimorfos CaCO3
As propriedades físicas e o espectro de excitações em materiais óxidos e semicondutores são apresentados neste trabalho, composto primeiramente por um estudo sobre o confinamento de fonons ópticos em sistemas artificiais baseados em nitretos III-V, crescidos periodicamente e quasi-periodicamente. A segunda parte deste trabalho descreve cálculos de pri
Publicado em: 2007
-
11. Uso de modificadores permanentes em filamento de tungstênio para aprisionamento de hidretos de arsênio, selênio, antimônio e vapor de mercúrio e determinação por espectrometria de absorção atômica. / Use of permanent modifiers on tungsten coil for in situ trapping of hydrides of arsenic, selenium, antimony and mercury vapor and determination by atomic absorption.
No presente trabalho, realizou-se um estudo sistemático do uso de modificadores químicos permanentes sobre atomizador de filamento de tungstênio para o aprisionamento de hidreto de selênio (H2Se), arsina (AsH3), estibina (SbH3) e vapor elementar de mercúrio. O aprisionamento deu-se sobre o filamento de tungstênio revestido com ródio ou irídio ou rut�
Publicado em: 2005
-
12. Geração eletroquímica do hidreto de selênio em sistema de injeção em fluxo com detecção por espectrometria de absorção atômica com chama Ar-Glp
This paper presents a system for electrochemical hydride generation using flow-injection and atomic absorption spectrometry to determine selenium in biological materials. The electrolytic cell was constructed by assembling two reservoirs, one for the sample and the other for the electrolytic solution separated by a Nafion membrane. Each compartment had a Pt
Química Nova. Publicado em: 2000-02