Applied Science Private University

About: Applied Science Private University is a education organization based out in Amman, Jordan. It is known for research contribution in the topics: Population & Catalysis. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

A Smart Nanofiber Web That Captures and Releases Cells

Abstract: Caught in a web: Photo-cross-linkable temperature-responsive polymer-based nanofiber webs have been synthesized that have the ability to capture, encapsulate, and release cells by dynamically transforming the fibrous structure into hydrogel-like structures by wrapping, swelling, and deswelling processes in response to external temperature changes (see picture).

The importance of transient states at higher coverages in catalytic reactions

Abstract: DFT-GGA periodic slab calculations were used to examine the adsorption and hydrogenation of ethylene to a surface ethyl intermediate on the Pd(111) surface. The reaction was examined for two different surface coverages, corresponding to (2×3) [low coverage] and (√3×√3)R 30° [high coverage] unit cells. For the low coverage, the di-σ adsorption of ethylene (−62 kJ/mol) is 32 kJ/mol stronger than the π-adsorption mode. The intrinsic activation barrier for hydrogenation of di-σ bonded ethylene to ethyl, for a (2×3) unit cell, was found to be +88 kJ/mol with a reaction energy of +25 kJ/mol. There appeared to be no direct pathway for hydrogenation of π-bonded ethylene to ethyl, for low surface coverages. At higher coverages, however, lateral repulsive interactions between adsorbates destabilize the di-σ adsorption of ethylene to a binding energy of −23 kJ/mol. A favorable surface geometry for the (√3×√3)R 30° coverage is achieved when ethylene is π-bound and hydrogen is bound to a neighboring bridge site. At hi...