scholarly journals Driving Force of Phase Transition in Indium Nanowires on Si(111)

2013 ◽  
Vol 110 (11) ◽  
Author(s):  
Hyun-Jung Kim ◽  
Jun-Hyung Cho
Keyword(s):  
Phase Transition ◽  
Driving Force

Role of the Kinetic Relation in a Phase Transition-Based Model for Mechanical Unfolding in Macromolecules

2010 ◽  
Author(s):  
Ritwik Raj ◽  
Prashant K. Purohit
Keyword(s):  
Phase Transition ◽  
Driving Force ◽  
Metastable States ◽  
Force Extension ◽  
Kinetic Relation ◽  
One Dimensional ◽  
Applied Tension ◽  
Thermodynamic Driving Force ◽  
Macro Molecule

We present applications of a model developed to describe unfolding in macromolecules under an axial force. We show how different experimentally observed force-extension behaviors can be reproduced within a common theoretical framework. We propose that the unfolding occurs via the motion of a folded/unfolded interface along the length of the molecule. The molecules are modeled as one-dimensional continua capable of existing in two metastable states under an applied tension. The interface separates these two metastable states and represents a jump in stretch, which is related to applied force by the worm-like-chain relation. The mechanics of the interface are governed by the Abeyaratne-Knowles theory of phase transitions. The thermodynamic driving force controls the motion of the interface via an equation called the kinetic relation. By choosing an appropriate kinetic relation for the unfolding conditions and the macro-molecule under consideration, we have been able to generate a variety of unfolding processes in macromolecules.

scholarly journals Phase Transition Behavior of HPMC-AA and Preparation of HPMC-PAA Nanogels

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Risheng Yao ◽  
Jiajia Xu ◽  
Xihua Lu ◽  
Shengsong Deng
Keyword(s):  
Phase Transition ◽  
Driving Force ◽  
Hydroxypropyl Methylcellulose ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Phase Transition Behavior ◽  
Critical Solution Temperature ◽  
Transmission Electron ◽  
Temperature Phase Transition ◽  
Redox Initiator

The lower critical solution temperature (LCST) of hydroxypropyl methylcellulose (HPMC) under mixing with acrylic acid (AA) monomer has been studied by turbidity measurements. It has been found that the LCST of the HPMC was drastically reduced from 60°C to 38°C with the increase of the concentration of AA, while the HPMC is kept at 0.5 wt%. The driving force shifting the LCST is attributed to the hydrogen bonding and hydrophobic interaction of the molecules. Then surfactant-free HPMC-PAA nanogels have been synthesized via the polymerization of AA monomer with the collapsed HPMC as a template or core at their LCST, using KPS and TEMED as redox initiator in the presence of BIS as cross-linking agent. HPMC-PAA nanogels have 50~150  nm diameters characterized by transmission electron microscope and dynamic light scattering. The HPMC-PAA nanogels exhibit the temperature phase transition behaviors, and these nanogels' volume phase transition temperature is close to the LCST of HPMC/AA system.

scholarly journals "Material" mechanics of materials

2002 ◽  
pp. 1-12 ◽  
Author(s):  
Gérard Maugin
Keyword(s):  
Phase Transition ◽  
Singular Point ◽  
Continuum Mechanics ◽  
Driving Force ◽  
Inhomogeneous Materials ◽  
Mechanics Of Materials ◽  
Recent Developments ◽  
Physical Effects ◽  
Transition Fronts ◽  
The Continuum

The paper outlines recent developments and prospects in the application of the continuum mechanics expressed intrinsically on the material manifold itself. This includes applications to materially inhomogeneous materials physical effects which, in this vision, manifest themselves as quasi-in homogeneities, and the notion of thermo dynamical driving force of the dissipative progress of singular point sets on the material manifold with special emphasis on fracture, shock waves and phase-transition fronts. .

Chemical Driving Force for Phase-Transition in the Ca2–xRExCdSb2 (RE = Yb, Eu; 0.11(1) ≤ x ≤ 1.36(2)) System

2019 ◽  
Vol 20 (2) ◽  
pp. 746-754 ◽  
Author(s):  
Kiwon Kim ◽  
Junsu Lee ◽  
Seungeun Shin ◽  
Hongil Jo ◽  
Dohyun Moon ◽  
...  
Keyword(s):  
Phase Transition ◽  
Driving Force

Regulating the phase transition of monoclinic Bi4O5Br2 through the synergistic effect of “drag force” and facet recognition by branched polyethyleneimine

CrystEngComm ◽  
2020 ◽  
Vol 22 (35) ◽  
pp. 5871-5881
Author(s):  
Zhaohui Wu ◽  
Min Wu ◽  
Zhongfu Li ◽  
Yue Pan ◽  
Junhao Qiu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Synergistic Effect ◽  
Drag Force ◽  
Driving Force

The synergistic effect of the “drag force” and facet recognition by BPEI was the driving force for the phase transition of BiOBr to Bi4O5Br2.

scholarly journals Reversible structure manipulation by tuning carrier concentration in metastable Cu2S

2017 ◽  
Vol 114 (37) ◽  
pp. 9832-9837 ◽  
Author(s):  
Jing Tao ◽  
Jingyi Chen ◽  
Jun Li ◽  
Leanne Mathurin ◽  
Jin-Cheng Zheng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Electronic Structure ◽  
Material Properties ◽  
Driving Force ◽  
The Other ◽  
Charge Generation ◽  
Control Material ◽  
Two Phases ◽  
Induced Changes

The optimal functionalities of materials often appear at phase transitions involving simultaneous changes in the electronic structure and the symmetry of the underlying lattice. It is experimentally challenging to disentangle which of the two effects––electronic or structural––is the driving force for the phase transition and to use the mechanism to control material properties. Here we report the concurrent pumping and probing of Cu2S nanoplates using an electron beam to directly manipulate the transition between two phases with distinctly different crystal symmetries and charge-carrier concentrations, and show that the transition is the result of charge generation for one phase and charge depletion for the other. We demonstrate that this manipulation is fully reversible and nonthermal in nature. Our observations reveal a phase-transition pathway in materials, where electron-induced changes in the electronic structure can lead to a macroscopic reconstruction of the crystal structure.

Sign in / Sign up

Export Citation Format

Share Document