Molecular Relaxation
Mostrando 13-24 de 211 artigos, teses e dissertações.
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13. Structure and dynamics of poly(9,9-dioctylfluoren-2,7-co-benzothiadiazole) (F8BT) and correlations with its electrical properties / Estrutura e dinâmica molecular do poly (9,9-dioctylfluoren-2,7-diyl-co-benzothiadiazole) (F8BT) e correlações com suas propriedades elétricas.
The PHD project has two main goals. The first one is specifically related to investigations on molecular dynamics, structural conformations and packing of polyfluorene-based polymers. For this purpose, Wide Angle X-Ray Diffraction (WAXD), Solid-State Nuclear Magnetic Resonance (NMR) and Dynamical-Mechanical Thermal Analysis (DMTA) are being used as the main
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/09/2011
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14. Spectroscopic study of molecular dynamics and packing in organic semiconductors / Estudo espectroscópico da dinâmica molecular e empacotamento em semicondutores orgânicos
In this dissertation we present a study of the molecular dynamics and packing in organics semiconductor with different conjugated chains lengths using a of multi-techniques approach, in particular, Nuclear Magnetic Resonance (NMR), Wide Angle X-ray Scattering (WAXS), Differential Scanning Calorimetry (DSC), Raman spectroscopy, UV-Vis absorption and fluoresce
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/07/2011
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15. Caracterização da relaxação por compressão de borracha acrílica irradiada. / Compression relaxation characterization of irradiated acrylic rubber.
Este trabalho tem como objetivo investigar a redução da relaxação por compressão de borracha acrílica modificada (ACM) irradiada por feixe de elétrons, através da caracterização de seu comportamento mecânico e de sua estrutura molecular. O material, nas condições original e irradiado, foi inicialmente submetido a ensaios uniaxiais de tração e
Publicado em: 2011
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16. Determinação de espectros de relaxação e distribuição de massa molar de polímeros lineares por reometria
A distribuição de massa molar (DMM) e seus parâmetros são de fundamental importância na caracterização dos polímeros. Por este motivo, o desenvolvimento de técnicas que permitam a determinação da DMM de forma mais rápida e a menor custo é de grande importância prática. Os principais objetivos deste trabalho foram a implementação de alguns do
Publicado em: 2010
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17. Caracterização molecular das fases de separação, relaxamento e remodelação da sínfise púbica do camundongo, durante a prenhez, parto e pós-parto / Molecular characterization of separation, relaxation and remodeling of the mouse pubic symphysis during pregnancy, partum and postpartum
A remodelação que a sínfise púbica (SP) sofre durante a prenhez, parto e pós-parto é um dos eventos importantes para o parto normal, e ocorre no trato reprodutor feminino como útero, cérvice uterina e sínfise púbica em alguns mamíferos. Durante a prenhez de alguns roedores ocorre um acentuado processo de remodelação da sínfise púbica (SP). No
Publicado em: 2010
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18. Molecular dynamics of articaine in POPC membranes / Dinamica molecular de articaina em membranas POPC
We studied the interactions of articaine - a local anesthetic widely used for me- dical and odontological applications - with model membranes of POPC (palmitoyl-oleyl-phosphatidylcholine) at biological relevant conditions. We have employed molecular dynamics technique, which allowed us to investigate the system at molecular level. Firstly, we applied quantum
Publicado em: 2009
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19. Molecular fluorescence in silica nanoparticles doped with quercetin and rhodamine B / Fluorescência molecular em nanopartículas de sílica marcadas com quercetina e rodamina B
Silica nanospheres doped with quercetin-Al+3 and rhodamine B were synthesized with high size control and morphology, using acid and basic catalysis of tetraethylorthosilicate (TEOS). The nanoparticle diameter obtained was about 200- 300 nm, with higher regularity when synthesized in alkaline media. The Stöbers and core-shell methods were used as preparation
Publicado em: 2009
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20. Estudo da tenacificação do poliestireno com elastômeros butadiênicos / Polystyrene toughening by butadiene elastomers
This Dissertation describes a study about the toughening of polystyrene with different types of polybutadiene (high-cis, low-cis and styrene - butadiene diblock or triblock copolymers). These materials (High Impact of PolyStyrene HIPS) were performed by melt blending. The mechanical properties (hardness, tensile strength and impact strength); morphology and
Publicado em: 2009
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21. Evaluation of PHB/Clay nanocomposite by spin-lattice relaxation time
Poly(3-hydroxybutyrate) (PHB) based on nanocomposites containing different amounts of a commercial organically modified clay (viscogel B7) were prepared employing solution intercalation method. Three solvents, such as: CHCl3, dimethylchloride (DMC) and tetrahydrofuran (THF) were used. The relationship among the processing conditions; molecular structure and
Materials Research. Publicado em: 2008-12
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22. Simulação computacional de espectros Raman de líquidos iônicos / Molecular dynamics simulation of Raman spectra of ionic liquids
In this work, theory, experiment and simulation are conjugated to investigate ionic liquids. The observed components in the low frequency part of the spectra (the region between 0 e 200 cm-1) results from the roto-translational dynamics and from inter molecular interactions. In this sense, the vibrational spectroscopies are inserted in the context of techniq
Publicado em: 2008
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23. Magnetically driven maser effect in the resonant dynamics of V15 molecular nanomagnets
Resonant dynamics of magnetic molecules with spin 1/2 ground state, such as V15, is theoretically studied. In our model calculation, crystals of this molecular nanomagnet are probed by time-dependent magnetic fields, which continuously invert populations of spin states. If the sample is placed in a resonant cavity, relaxation of excited states, via spin-phot
Brazilian Journal of Physics. Publicado em: 2007-09
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24. Estudo da morfologia e dinâmica molecular de filmes de MEH-PPV via espalhamento de raios-x de alto ângulo e ressonância magnética nuclear do estado sólido / Morphology and molecular dynamics of MEH-PPV films using wide-angle x-ray scattering and solid-state nuclear magnetic resonance
The morphology and dynamic of MEH-PPV films prepared by casting from toluene and chloroform were studied using Wide-Angle X-ray Scattering (WAXS) and Solid-State Nuclear Magnetic Resonance (NMR) techniques, respectively. Evidences of the increase in the aggregation were obtained by WAXS, which revealed a tendency of increasing in the molecular ordering upon
Publicado em: 2007