scholarly journals Energy Dependent XPS Measurements on Thin Films of a Poly(vinyl methyl ether)/Polystyrene Blend in Dependence on Film Thickness – Concentration Profile on a Nanometer Resolution to Understand the Behavior of Nanofilms

Soft Matter ◽  
2021 ◽  
Author(s):  
Marcel Gawek ◽  
Sherif Madkour ◽  
Paulina Szymoniak ◽  
Jörg Radnik ◽  
Andreas Schoenhals
Keyword(s):  
Thin Films ◽  
Surface Layer ◽  
Film Thickness ◽  
Polymer Blends ◽  
Concentration Profile ◽  
Vinyl Methyl ◽  
Vinyl Methyl Ether ◽  
Miscible Polymer Blends ◽  
Air Interface ◽  
Energy Dependent

The composition of the surface layer in dependence from the distance of the polymer/air interface in thin films with thicknesses below 100 nm of miscible polymer blends on a spatial...

Accelerated Reaction Kinetics in Microdroplets: Overview and Recent Developments

2020 ◽  
Vol 71 (1) ◽  
pp. 31-51 ◽  
Author(s):  
Zhenwei Wei ◽  
Yangjie Li ◽  
R. Graham Cooks ◽  
Xin Yan
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Bond Formation ◽  
Critical Energy ◽  
Reaction Rates ◽  
Small Scale ◽  
Air Interface ◽  
Key Factor ◽  
Synthetic Reactions ◽  
Recent Developments

Various organic reactions, including important synthetic reactions involving C–C, C–N, and C–O bond formation as well as reactions of biomolecules, are accelerated when the reagents are present in sprayed or levitated microdroplets or in thin films. The reaction rates increase by orders of magnitude with decreasing droplet size or film thickness. The effect is associated with reactions at the solution–air interface. A key factor is partial solvation of the reagents at the interface, which reduces the critical energy for reaction. This phenomenon is of intrinsic interest and potentially of practical value as a simple, rapid method of performing small-scale synthesis.

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