179 citations · 790 across the 27 of their papers we have counts for
18 papers · 1 filter
One micron length scale controls kinetic stability of low energy glasses
Kenneth L. Kearns, M. D. Ediger, Heiko Huth +1
AC nanocalorimetry was used to measure the reversing heat capacity Cp of low energy indomethacin glasses as they isothermally transform into the supercooled liquid. As the film thi…
Comparison of mechanical and molecular measures of mobility during constant strain rate deformation of a PMMA glass
Benjamin Bending, M. D. Ediger
We performed constant strain rate deformation and stress relaxation on a poly(methyl methacrylate) glass at Tg - 19 K, utilizing three strain rates and initiating the stress relaxa…
Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal
Ankit Gujral, Jaritza Gomez, Jing Jiang +6
Glasses of a model smectic liquid crystal-forming molecule, itraconazole, were prepared by vapor deposition onto substrates with temperatures ranging from Tsubstrate = 0.78 Tg to 1…
Reversing strain deformations probe mechanisms for enhanced segmental mobility of polymer glasses
Kelly Hebert, M. D. Ediger
Optical probe reorientation measurements were performed to monitor changes in segmental dynamics resulting from the nonlinear deformation of a polymer glass. Segmental dynamics wer…
Over what length scale does an inorganic substrate perturb the structure of a glassy organic semiconductor?
Kushal Bagchi, Chuting Deng, Camille Bishop +6
While the bulk structure of vapor-deposited glasses has been extensively studied, structure at buried interfaces has received little attention, despite being important for organic…
Accurate Evaluation of Nanoscale Spatiotemporal Dynamics with Electron Correlation Microscopy
Po-Cheng Kung, Ajay Annamareddy, Mark D. Ediger +2
Electron correlation microscopy (ECM) can measure materials dynamics with nanoscale spatial resolution from intensity correlation functions. However, adopting X-ray photon correlat…
Stable Glasses of Organic Semiconductor Resist Crystallization
Kushal Bagchi, Marie E. Fiori, Camille Bishop +2
The instability of glassy solids poses a key limitation to their use in several technological applications. Well-packed organic glasses, prepared by physical vapor deposition (PVD)…
Using Deposition Rate and Substrate Temperature to Manipulate Liquid Crystal-like Order in a Vapor-deposited Hexagonal Columnar Glass
Camille Bishop, Zhenxuan Chen, Michael F. Toney +3
We investigate vapor-deposited glasses of a phenanthroperylene-ester, known to form an equilibrium hexagonal columnar phase, and show that liquid crystal-like order can be manipula…
Multi-step deformation experiment and development of a model for the mechanical behavior of polymeric glasses
Grigori A Medvedev, Enran Xing, Mark D Ediger +1
Traditional models for stress-strain behavior of glassy polymers are based on the assumption that the critical features of the stress-strain response can be explained by changes in…
Segmental Dynamics in the Strain-hardening Regime for Poly(methyl methacrylate) Glasses with and without Melt-stretching
Enran Xing, Trevor Bennin, Masoud Razavi +1
Strain-hardening is a feature of polymer glasses during large deformation, which helps to stabilize the glasses against breakage. Experimentally, little is known about the segmenta…
Surface Equilibration Mechanism Controls the Stability of a Model Co-deposited Glass Mixture of Organic Semiconductors
Shinian Cheng, Yejung Lee, Junguang Yu +2
While previous work has identified the conditions for preparing ultrastable single-component organic glasses by physical vapor deposition (PVD), little is known about the stability…
Overaging with stress in polymer glasses? Faster segmental dynamics despite larger yield stress!
Masoud Razavi, Enran Xing, M. D. Ediger
It is well known that physical aging of polymer glasses increases their yield stress and affects their failure behavior. Studies indicate that application of moderate levels of str…
The structural relaxation time of a polymer glass during deformation
Pradip K. Bera, Grigori A. Medvedev, James M. Caruthers +1
In order to determine the structural relaxation time of a polymer glass during deformation, a strain rate switching experiment is performed in the steady-state plastic flow regime.…
Generic behavior of ultrastability and anisotropic molecular packing in co-deposited organic semiconductor glass mixtures
Shinian Cheng, Yejung Lee, Junguang Yu +2
Vapor-deposited glass mixtures of organic semiconductors commonly serve as active layers in organic electronic devices, whose lifetime and performance are strongly influenced by th…
High density two-component glasses of organic semiconductors prepared by physical vapor deposition
Yejung Lee, Shinian Cheng, M. D. Ediger
Physical Vapor Deposition (PVD) is widely utilized for the production of organic semiconductor devices due to its ability to form thin layers with exceptional properties. Although…
Thermal stability of vapor-deposited stable glasses of an organic semiconductor
Diane M. Walters, Ranko Richert, M. D. Ediger
Vapor-deposited organic glasses can show enhanced kinetic stability relative to liquid-cooled glasses. When such stable glasses of model glassformers are annealed above the glass t…
Vapor-to-glass preparation of biaxially aligned organic semiconductors
Jianzhu Ju, Debaditya Chatterjee, Paul M. Voyles +2
Physical vapor deposition (PVD) provides a route to prepare highly stable and anisotropic organic glasses that are utilized in multi-layer structures such as organic light-emitting…
Controlled component segregation in vapor-deposited organic semiconductor glass mixtures
Shinian Cheng, Yejung Lee, Lian Yu +3
Multicomponent vapor-deposited organic glasses are essential in organic electronic applications, but achieving controlled component segregation at the nano- and mesoscale remains a…