Now showing items 1-10 of 15
Monitoring of engine oil aging by diffusion and low-field nuclear magnetic resonance relaxation
Time domain, also named lowfield nuclear magnetic resonance is used to monitor oil degradation by measuring relaxation and diffusion. As quality control of oils is indispensable to optimize oil change intervals while ...
Internal Magnetic Field Gradients in Paramagnetic Shale Pores
(Springer Wien, 2017-10)
The present work involves a comprehensive study to provide a theoretical model of the internal magnetic field gradients, present in paramagnetic shale pores, to explain the main relaxation features observed by nuclear ...
Probing Surface Effects on α-NaYF4 Nanoparticles by Nuclear Magnetic Resonance
(American Chemical Society, 2020-04)
The structural properties of insulating α-NaYF4 (cubic) nanoparticles with size ranging within 4-25 nm were investigated by high-resolution 23Na and 19F solid-state nuclear magnetic resonance (NMR) spectroscopy under magic ...
Nuclear magnetic resonance of protons on DMSO-02-NaX Zeoli te-system
(Facultad Experimental de Ciencias de la Universidad del Zulia, 2010)
Transiently trapped entanglements in model polymer networks
(American Chemical Society, 2009-06)
The relaxational dynamics of trapped entanglements in model silicone polymer networks is studied through the residual dipolar couplings (RDC) obtained by double quantum nuclear magnetic resonance (DQ NMR). These experiments ...
Magnetic resonance imaging of 1H long lived states derived from parahydrogen induced polarization in a clinical system
(Academic Press Inc Elsevier Science, 2016-01)
Hyperpolarization is a powerful tool to overcome the low sensitivity of nuclear magnetic resonance (NMR). However, applications are limited due to the short lifetime of this non equilibrium spin state caused by relaxation ...
Hyperpolarized 1H long lived states originating from parahydrogen accessed by rf irradiation
(Royal Society of Chemistry, 2013-09)
Hyperpolarization has found many applications in Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI). However, its usage is still limited to the observation of relatively fast processes because of its ...
Dynamics of binary mixtures of an ionic liquid and ethanol by NMR
(John Wiley & Sons Ltd, 2017-07-10)
A study of molecular dynamics of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoro-methylsulphonyl)imide ([Emim][Tf2N]) in solution with deuterated ethanol at different molar concentration and temperatures is ...
Elasticidade dos polímeros e compósitos forças de Van Der WallElasticity of the polymers and composite forces of Van Der Wall
(Brazilian Journals Publicações de Periódicos e Editora, 2019-06)
O objetivo do trabalho é estabelecer o vínculo entre as pesquisas teóricas e experimentais para melhor compreensão das diversas características da Engenharia e Ciência dos Materiais utilizando os seguintes polímeros e seus ...
Physico-Chemical and Mechanical Properties of Apple Disks Subjected to Osmotic Dehydration and Different Drying Methods
The effect of sucrose infusion (SI) pretreatment and dehydration methods (freeze and air drying) on physical and textural properties of apple disks were analyzed. Dried samples were humidified between 11% and 43% relative ...