Results 91 to 100 of about 1,056,607 (320)

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

open access: yesAdvanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal   +10 more
wiley   +1 more source

Analytical Calculation of the Nucleation Rate for First Order Phase Transitions beyond the Thin Wall Approximation

open access: yes, 1999
First order phase transitions in general proceed via nucleation of bubbles. A theoretical basis for the calculation of the nucleation rate is given by the homogeneous nucleation theory of Langer and its field theoretical version of Callan and Coleman. We
Münster, Gernot, Rotsch, Sabine
core   +2 more sources

The effect of primordial temperature fluctuations on the QCD transition [PDF]

open access: yes, 2000
We analyze a new mechanism for the cosmological QCD first-order phase transition: inhomogeneous nucleation. The primordial temperature fluctuations are larger than the tiny temperature interval, in which bubbles would form in the standard picture of ...
Ignatius, J., Schwarz, Dominik J.
core   +3 more sources

Prior heterogeneous ice nucleation events shape homogeneous freezing during the evolution of synoptic cirrus [PDF]

open access: yesAtmospheric Chemistry and Physics
In situ observations are currently used to classify synoptic cirrus as formed by homogeneous or heterogeneous ice nucleation based on ice residual analysis.
K. Juurikkala   +8 more
doaj   +1 more source

Cu‐Based MOF/TiO2 Composite Nanomaterials for Photocatalytic Hydrogen Generation and the Role of Copper

open access: yesAdvanced Functional Materials, EarlyView.
HKUST‐1/TiO2 composite materials show a very high photocatalytic hydrogen evolution rate which increases as a function of the irradiation time until reaching a plateau and even surpasses the performance of the 1%Pt/TiO2 material after three photocatalytic cycles.
Alisha Khan   +9 more
wiley   +1 more source

Supercooling of rapidly expanding quark-gluon plasma [PDF]

open access: yes, 1998
We reexamine the scenario of homogeneous nucleation of the quark-gluon plasma produced in ultra-relativistic heavy ion collisions. A generalization of the standard nucleation theory to rapidly expanding system is proposed.
Bravina, L. V.   +4 more
core   +2 more sources

Volume nucleation rates for homogeneous freezing in supercooled water microdroplets: results from a combined experimental and modelling approach [PDF]

open access: yesAtmospheric Chemistry and Physics, 2010
Temperature-dependent volume nucleation rate coefficients for supercooled water droplets, <i>J<sub>V</sub>(T</i>), are derived from infrared extinction measurements in a cryogenic laminar aerosol flow tube using a microphysical ...
M. E. Earle   +3 more
doaj   +1 more source

Homogeneous ice nucleation evaluated for several water models. [PDF]

open access: yesJournal of Chemical Physics, 2014
In this work, we evaluate by means of computer simulations the rate for ice homogeneous nucleation for several water models such as TIP4P, TIP4P/2005,TIP4P/ICE, and mW (following the same procedure as in Sanz et al. [J. Am. Chem. Soc. 135, 15008 (2013)])
J. R. Espinosa   +3 more
semanticscholar   +1 more source

MOFs and COFs in Electronics: Bridging the Gap between Intrinsic Properties and Measured Performance

open access: yesAdvanced Functional Materials, EarlyView.
Metal‐organic frameworks (MOFs) and covalent organic frameworks (COFs) hold promise for advanced electronics. However, discrepancies in reported electrical conductivities highlight the importance of measurement methodologies. This review explores intrinsic charge transport mechanisms and extrinsic factors influencing performance, and critically ...
Jonas F. Pöhls, R. Thomas Weitz
wiley   +1 more source

Phase-field crystal modelling of crystal nucleation, heteroepitaxy and patterning

open access: yes, 2010
We apply a simple dynamical density functional theory, the phase-field-crystal (PFC) model, to describe homogeneous and heterogeneous crystal nucleation in 2d monodisperse colloidal systems and crystal nucleation in highly compressed Fe liquid.
Brazovskii SA   +16 more
core   +1 more source

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