Polarization Effects in Graded AlGaN Nanolayers Revealed by Current-Sensing and Kelvin Probe Microscopy

2018 ◽  
Vol 10 (7) ◽  
pp. 6755-6763 ◽  
Author(s):  
Petro M. Lytvyn ◽  
Andrian V. Kuchuk ◽  
Yuriy I. Mazur ◽  
Chen Li ◽  
Morgan E. Ware ◽  
...  
2015 ◽  
Vol 1754 ◽  
pp. 69-74
Author(s):  
Ravi Gaikwad ◽  
Tinu Abraham ◽  
Aharnish Hande ◽  
Fatemeh Bakhtiari ◽  
Siddhartha Das ◽  
...  

ABSTRACTAtomic force microscopy is employed to study the structural changes in the morphology and physical characteristics of asphaltene aggregates as a function of temperature. The exotic fractal structure obtained by evaporation-driven asphaltene aggregates shows an interesting dynamics for a large range of temperatures from 25°C to 80°C. The changes in the topography, surface potential and adhesion are unnoticeable until 70°C. However, a significant change in the dynamics and material properties is displayed in the range of 70°C - 80°C, during which the aspahltene aggregates acquire ‘liquid-like’ mobility and fuse together. This behaviour is attributed to the transition from the pure amorphous phase to a crystalline liquid phase which occurs at approximately 70°C as shown by using Differential Scanning Calorimetry (DSC). Additionally, the charged nature of asphaltenes and bitumen is also explored using kelvin probe microscopy. Such observations can lead to the development of a rational approach to the fundamental understanding of asphaltene aggregation dynamics and may help in devising novel techniques for the handling and separation of asphaltene aggregates using dielectrophoretic methods.


2016 ◽  
Vol 28 (2) ◽  
pp. 025703 ◽  
Author(s):  
M F Orihuela ◽  
A M Somoza ◽  
J Colchero ◽  
M Ortuño ◽  
E Palacios-Lidón

2021 ◽  
pp. 113399
Author(s):  
Junqi Lai ◽  
Cheng Wang ◽  
Zhiwei Xing ◽  
Shulong Lu ◽  
Qi Chen ◽  
...  

2004 ◽  
Vol 10 (S02) ◽  
pp. 1090-1091
Author(s):  
Marion A. Stevens-Kalceff

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.


2020 ◽  
pp. 100-108
Author(s):  
Fangyuan Jiang ◽  
Justin Pothoof ◽  
Franziska Muckel ◽  
Rajiv Giridharagopal ◽  
Jian Wang ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document