Fast Surface Crystallization of Molecular Glasses: Creation of Depletion Zones by Surface Diffusion and Crystallization Flux

2015 ◽  
Vol 119 (7) ◽  
pp. 3304-3311 ◽  
Author(s):  
Mariko Hasebe ◽  
Daniele Musumeci ◽  
Lian Yu
Keyword(s):  
Surface Diffusion ◽  
Surface Crystallization ◽  
Molecular Glasses

scholarly journals Influence of Hydrogen Bonding on the Surface Diffusion of Molecular Glasses: Comparison of Three Triazines

2017 ◽  
Vol 121 (29) ◽  
pp. 7221-7227 ◽  
Author(s):  
Yinshan Chen ◽  
Men Zhu ◽  
Audrey Laventure ◽  
Olivier Lebel ◽  
M. D. Ediger ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Surface Diffusion ◽  
Molecular Glasses

scholarly journals Why is surface diffusion the same in ultrastable, ordinary, aged, and ultrathin molecular glasses?

2017 ◽  
Vol 19 (44) ◽  
pp. 29905-29912 ◽  
Author(s):  
K. L. Ngai ◽  
Marian Paluch ◽  
Cristian Rodríguez-Tinoco
Keyword(s):  
Thin Film ◽  
Diffusion Coefficient ◽  
Surface Diffusion ◽  
Molecular Glasses ◽  
Surface Diffusion Coefficient

The primitive/JG relaxation explains the same surface diffusion coefficient in ordinary, ultrastable and thin film glasses of OTP and TPD.

Hydrogen Bonding Slows Down Surface Diffusion of Molecular Glasses

2016 ◽  
Vol 120 (32) ◽  
pp. 8007-8015 ◽  
Author(s):  
Yinshan Chen ◽  
Wei Zhang ◽  
Lian Yu
Keyword(s):  
Hydrogen Bonding ◽  
Surface Diffusion ◽  
Molecular Glasses

Using tobacco mosaic virus to probe enhanced surface diffusion of molecular glasses

Soft Matter ◽  
2016 ◽  
Vol 12 (44) ◽  
pp. 9115-9120 ◽  
Author(s):  
Yue Zhang ◽  
Richard Potter ◽  
William Zhang ◽  
Zahra Fakhraai
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Surface Diffusion ◽  
Molecular Glasses ◽  
Enhanced Surface

scholarly journals Decoupling of surface diffusion and relaxation dynamics of molecular glasses

2017 ◽  
Vol 114 (19) ◽  
pp. 4915-4919 ◽  
Author(s):  
Yue Zhang ◽  
Zahra Fakhraai
Keyword(s):  
Activation Energy ◽  
Film Thickness ◽  
Temperature Dependence ◽  
Surface Diffusion ◽  
Ultrathin Films ◽  
Effective Activation Energy ◽  
Relaxation Times ◽  
Relaxation Dynamics ◽  
Molecular Glasses ◽  
20 Nm

Tobacco mosaic virus is used as a probe to measure surface diffusion of ultrathin films of N,N′-Bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) (12 nm <h< 53 nm, where h is the film thickness) at various temperatures below the glass transition temperature, 𝐓𝐠, of all films. As the film thickness is decreased, 𝐓𝐠 decreases rapidly and the average film dynamics are enhanced by 6–14 orders of magnitude. We show that the surface diffusion is invariant of the film thickness decrease and the resulting enhanced overall mobility. The values of the surface diffusion coefficient and its temperature dependence are invariant of film thickness and are the same as the corresponding bulk values (h=400 nm). For the thinnest films (h<20 nm), the effective activation energy for rearrangement (temperature dependence of relaxation times) becomes smaller than the activation energy for surface diffusion. These results suggest that the fast surface diffusion is decoupled from film relaxation dynamics and is a solely free surface property.

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

Blue Sapphire with Partial Red Surface Diffusion

2020 ◽  
Vol 37 (1) ◽  
pp. 23-24
Author(s):  
Bear Williams ◽  
Cara Williams ◽  
Charles I. Carmona
Keyword(s):  
Surface Diffusion
Sign in / Sign up

Export Citation Format

Share Document