14 papers · ranked by Valyu relevance
Jian Zhou, Wei Fan, Yangdong Wang, Zaiku Xie
An important topic in zeolite catalyst design is how to improve utilization efficiency of active sites in micropores by upgrading the effective diffusivity of reactants/products in zeolite crystal particles . Nano- and hierarchical structures have drawn lots of attention in zeolitic catalysis fields in recent years…
Florian Wesenauer, Christian Jordan, Mudassar Azam, Michael Harasek + 2 more
'Franz Winter' 'Pasquale Fernando Fulvio'] A series of porous clay samples prepared at different pretreatment temperatures have been tested in a diffusion chamber. Diffusivity and permeability were examined in a temperature range from ambient to 900 °C. Gaseous mixtures of O2, CO2, and N2 have been applied, as these…
Anton Tamtögl, Marco Sacchi
The single-molecule dynamics of π-conjugated organic molecules on surfaces is fundamental for applications ranging from catalysis to molecular electronics. Adsorption and diffusion, in particular of organic aromatics, are typically driven by van der Waals forces, energy dissipation in terms of friction, and quantum…
Chu Li, Jizu Huang, Zhigang Li
In this work, we study the diffusion of nanodroplets on smooth surfaces through molecular dynamics (MD) simulations and theoretical analyses. Molecular dynamics simulations show that nanodroplet surface diffusion is different from that of single molecules and solid particles. The dependence of nanodroplet diffusion…
Katarzyna Bizon, Dominika Boroń, Bolesław Tabiś, Sébastien Déon + 1 more
'Kang Xiao'] The study addresses one of the fundamental issues in the mathematical modeling and quantitative process analysis of complex multicomponent diffusion in meso- and microporous materials. The model presented here incorporates combined molecular diffusion, Knudsen diffusion, viscous flow, and surface…
Jeremy Adler, Ida-Maria Sintorn, Robin Strand, Ingela Parmryd
Cells are neither flat nor smooth, which has serious implications for prevailing plasma membrane models and cellular processes like cell signalling, adhesion and molecular clustering. Using probability distributions from diffusion simulations, we demonstrate that 2D and 3D Euclidean distance measurements substantially…
Zhenbo Wang, Ke Lu, Horst Hahn
Gradient nanostructures (GNSs) have been optimized in recent years for desired performance. The diffusion behavior in GNS metals is crucial for understanding the diffusion mechanism and relative characteristics of different interfaces that provide fundamental understanding for advancing the traditional surface alloying…
Takuya Kuwahara, Hiroshi Ito, Kentaro Kawaguchi, Yuji Higuchi + 2 more
'Nobuki Ozawa' 'Momoji Kubo'] Thin-film Si grows layer by layer on Si(001)-(2 × 1):H in plasma-enhanced chemical vapor deposition. Here we investigate the reason why this occurs by using quantum chemical molecular dynamics and density functional theory calculations. We propose a dangling bond (DB) diffusion model as an…
Wenjun Gu, Peng Cheng, Mingjin Tang
Organic halogens are of great environmental and climatic concern. In this work, we have compiled their gas phase diffusivities (pressure-normalized diffusion coefficients) in a variety of bath gases experimentally measured by previous studies. It is found that diffusivities estimated using Fuller's semi-empirical…
Steven T. Nicholson, Kevin J. Roberts, Toshiko Izumi, Xiaojun Lai
of Mass Transfer within the Crystal-Solution Boundary Layer of l -Alanine {120} Faces Using Laser Interferometry during Growth and Dissolution Authors: ['Steven\nT. Nicholson' 'Kevin J. Roberts' 'Toshiko Izumi' 'Xiaojun Lai'] Crystallization and dissolution are important processes to consider in drug development as…
Zdenek Jakub, Matthias Meier, Florian Kraushofer, Jan Balajka + 5 more
'Jiri Pavelec' 'Michael Schmid' 'Cesare Franchini' 'Ulrike Diebold' 'Gareth S. Parkinson'] Oxygen exchange at oxide/liquid and oxide/gas interfaces is important in technology and environmental studies, as it is closely linked to both catalytic activity and material degradation. The atomic-scale details are mostly…
Paul E. Schavemaker, Arnold J. Boersma, Bert Poolman
That diffusion is important for the proper functioning of cells is without question. The extent to which the diffusion coefficient is important is explored here for prokaryotic cells. We discuss the principles of diffusion focusing on diffusion-limited reactions, summarize the known values for diffusion coefficients in…
Minkyung Kim, Jiwhan Noh
A hydrophilic line on a hydrophobic surface was fabricated by using plasma etching and laser ablation processing in this paper. We fabricated the nanospikes on a polyimide surface by using the plasma etching processing. CHF3 plasma treatment for hydrophobic coating was conducted on these nanospikes. We fabricated the…
Samih Haj Ibrahim, Tomasz Wejrzanowski, Bartłomiej Przybyszewski, Rafał Kozera + 3 more
'Rafał Kozera' 'Xabier García-Casas' 'Angel Barranco' 'Ana Paula Piedade'] Within these studies, the effect of surface topography for hydrophobic coatings was studied both numerically and experimentally. Chemically modified polyurethane coating was patterned by application of a laser beam. A set of patterns with…