Exploració per tema "Crystals"
Ara es mostren els items 1-20 de 32
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Acoustically penetrable sonic crystals based on fluid-like scatterers
(2015-01-21)
Article
Accés obertWe propose a periodic structure that behaves as a fluid-fluid composite for sound waves, where the building blocks are clusters of rigid scatterers. Such building-blocks are penetrable for acoustic waves, and their properties ... -
Ag2ZnSnS4 Nanocrystals Expand the Availability of RoHS Compliant Colloidal Quantum Dots
(ACS, 2020)
Article
Accés obertThe demonstration of the quantum confinement effect in colloidal quantum dots (QDs) has been extensively studied and exploited mainly in Pb and Cd chalcogenide systems. There has been an urgent need recently for the ... -
An integrated view of theiInfluence of temperature, pressure, and humidity on the stability of trimorphic cysteamine hydrochloride
(2015-07-01)
Article
Accés obertUnderstanding the phase behavior of pharmaceuticals is important for dosage form development and regulatory requirements, in particular after the incident with ritonavir. In the present paper, a comprehensive study of the ... -
C60 solvate with (1,1,2)-trichloroethane: dynamic statistical disorder and mixed conformation
(2016-05-27)
Article
Accés obertWe present a full characterization of the orientationally disordered cocrystal of C-60 with (1,1,2)-triChloroethane (C2H3Cl3), by means of X-ray diffraction, Raman spectroscopy, and broadband dielectric spectroscopy. Our ... -
Corrosion resistance of crystalline and amorphous CuZr alloys in NaCl aqueous environment and effect of corrosion inhibitors
(2021-10-25)
Article
Accés obertCuZr alloys are the basis of a family of metallic glasses with large glass forming ability and remarkable mechanical properties. The corrosion response of prepared crystalline and amorphous CuxZr100-x alloys (x = 40, 50, ... -
Crystal structure of polymorph II and the pressure-temperature phase diagram of the dimorphic anesthetic butamben
(American Chemical Society, 2021-11-18)
Article
Accés obertThe crystal structure of the low-temperature form II of butamben has been solved in a P21/c space group very similar to that of form I. Form II possesses virtually the same packing as that of the high-temperature form I, ... -
Crystal structures and phase relationships of 2 polymorphs of 1,4-Diazabicyclo[3.2.2]nonane-4-Carboxylic Acid 4-Bromophenyl Ester Fumarate, A selective a-7 nicotinic receptor partial agonist
(2016-01)
Article
Accés obertTwo polymorphs of the 1:1 fumarate salt of 1,4-diazabicyclo[3.2.2]nonane-4-carboxylic acid 4-bromophenyl ester, developed for the treatment of cognitive symptoms of schizophrenia and Alzheimer disease, have been characterized. ... -
Crystalline tetrazepam as a case study on the volume change on melting of molecular organic compounds
(2021-01-25)
Article
Accés obertThe volume change on melting is a rarely studied quantity and it is not well understood even if it must reflect the changes in interaction between the solid and the liquid state. It is part of the solid-state information ... -
Dynamical tuning of the thermal conductivity via magnetophononic effects
(American Physical Society (APS), 2022-03-01)
Article
Accés obertStrategies for tuning the thermal conductivity of crystals by means of external fields are rare. Here, we predict the existence of large magnetophononic effects in materials that undergo antiferromagnetic (AFM) ¿ ferromagnetic ... -
Electrically polarized hydroxyapatite: influence of the polarization process on the microstructure and properties
(2019-11-19)
Article
Accés obertSemipermanently polarized hydroxyapatite, named SP/HAp(w), is obtained by applying a constant dc electric field of 1–10 kV/cm at 300–850 °C to the samples previously sintered in water vapor, while permanently polarized ... -
Enantiomer resolution by pressure increase: inferences from experimental and topological results for the binary enantiomer system (R)- and (S)-mandelic acid
(2011-11-02)
Article
Accés restringit per política de l'editorialIn pharmacy, racemic compounds are often problematic, because generally only one of the enantiomers possesses therapeutic activity and it is often difficult to separate them. Even though this problem is likely as old ... -
Estudi micromecànic de recobriments metàl·lics prims sotmesos a variacions tèrmiques; simulacions per elements finits utilitzant un model de plasticitat cristal·lina
(Universitat Politècnica de Catalunya, 2008-02)
Projecte/Treball Final de Carrera
Accés obertEl present projecte mostra un estudi de tensions, corbatures i densitat de dislocacions en les deposicions de capes fines de coure monocristal·lí sobre silici. Aquestes alteracions es produeixen durant la seva fabricació ... -
Estudio de la viabilidad sobre el uso de los modelos de plasticidad cristalina en la modelización de la deformación plástica de cristales hexagonales.
(Universitat Politècnica de Catalunya, 2009-02)
Projecte/Treball Final de Carrera
Accés obertEste proyecto esta una primera enfoque de la viabilidad sobre el uso de los modelos de plasticidad cristalina en la modelizacion de la deformacion plástica de cristales hexagonales. El estudio pretende encontrar opciones ... -
Fingerprints of the crossing of the Frenkel and melting line on the properties of high-pressure supercritical water
(2022-08-25)
Article
Accés obertUsing molecular dynamics simulations in combination with the two-phase thermodynamic model, we reveal novel characteristic fingerprints of the crossing of the Frenkel and melting line on the properties of high-pressure ... -
Geometric confinement controls stiffness, strength, extensibility, and toughness in poly(urethane–urea) copolymers
(American Chemical Society (ACS), 2021-05-25)
Article
Accés obertAchieving a unique combination of stiffness, strength, extensibility, and toughness in sol-cast poly(urethane–urea) (PU) copolymer films is a challenge since these properties are—in general—mutually exclusive. Here we ... -
Geometrically necessary dislocations on plastic deformation of polycrystalline TRIP steel
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-01)
Article
Accés obertIn this study, the main deformation behavior in terms of geometrically necessary dislocations (GND) was investigated on a transformation induced plasticity (TRIP) stainless steel by using sharp indentation at nanometric ... -
Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid
(2017-11-21)
Article
Accés obertThe low-temperature thermal and transport properties of an unusual kind of crystal exhibiting minimal molecular positional and tilting disorder have been measured. The material, namely, low-dimensional, highly anisotropic ... -
Inter-enantiomer conversion dynamics and Johari–Goldstein relaxation of benzophenones
(Nature, 2021-10-12)
Article
Accés obertWe employ temperature- and pressure-dependent dielectric spectroscopy, as well as differential scanning calorimetry, to characterize benzophenone and the singly-substituted ortho-bromobenzophenone derivative in the liquid ... -
Low-Temperature Heat Capacity Anomalies in Ordered and Disordered Phases of Normal and Deuterated Thiophene
(2021-03-04)
Article
Accés obertWe measured the specific heat Cp of normal (C4H4S) and deuterated (C4D4S) thiophene in the temperature interval of 1 = T, K = 25. C4H4S exhibits a metastable phase II2 and a stable phase V, both with frozen orientational ... -
Nonspreading Light Pulses in Photonic Crystals
(2005-05)
Report de recerca
Accés obertWe investigate propagation of light pulses in photonic crystals in the vicinity of the zero-diffraction point. We show that Gaussian pulses due to nonzero width of their spectrum spread weakly in space and time during the ...