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

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

scholarly journals Triazine-based molecular glasses frustrate the crystallization of barbiturates

CrystEngComm ◽  
2019 ◽  
Vol 21 (11) ◽  
pp. 1734-1741 ◽  
Author(s):  
Audrey Laventure ◽  
Dominic Lauzon ◽  
Christian Pellerin ◽  
Olivier Lebel
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Engineering ◽  
Crystal Packing ◽  
Molecular Glasses

Hydrogen bonding is a key element in crystal engineering to direct crystal packing. Here, hydrogen bonding with molecular glasses is rather exploited to thwart crystallization.

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.

Unraveling the interplay between hydrogen bonding and rotational energy barrier to fine-tune the properties of triazine molecular glasses

2016 ◽  
Vol 18 (3) ◽  
pp. 1681-1692 ◽  
Author(s):  
Audrey Laventure ◽  
Guillaume De Grandpré ◽  
Armand Soldera ◽  
Olivier Lebel ◽  
Christian Pellerin
Keyword(s):  
Hydrogen Bonding ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Energy Barrier ◽  
Glass Forming Ability ◽  
Rotational Energy ◽  
Molecular Glasses ◽  
Glass Forming ◽  
Fine Tune

Mexylaminotriazine derivatives form molecular glasses with outstanding glass-forming ability (GFA), glass kinetic stability (GS), and tunable glass transition temperature. This work establishes key molecular parameters for efficient glass engineering.

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.

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