Domain relaxation dynamics in epitaxial BiFeO3 films: Role of surface charges

2012 ◽  
Vol 112 (5) ◽  
pp. 052017 ◽  
Keyword(s):  
Relaxation Dynamics ◽  
Surface Charges

Formation of hybrid colloids by suspension polycondensation in the presence of hydrophilic block copolymers

2002 ◽  
Vol 726 ◽  
Author(s):  
Corine Gerardin ◽  
Valérie Buissette ◽  
François Gaudemet ◽  
Olivier Anthony ◽  
Nicolas Sanson ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Colloidal Suspensions ◽  
Surface Charges ◽  
Inorganic Particles ◽  
Hydrous Oxides ◽  
Stabilization Phase ◽  
Metal Ratio ◽  
Forced Hydrolysis ◽  
Hydrolysis Of

AbstractDouble hydrophilic block copolymers were used to control the growth of inorganic particles and directly prepare hybrid colloidal suspensions. Colloids of metal hydrous oxides were obtained by forced hydrolysis of metal ions in presence of the copolymers. The block copolymers contain a metal-complexing polyelectrolyte block and a stabilizing neutral block. The role of the first block is to ensure a controlled growth of the inorganic phase, while simultaneously, the second block ensures the colloidal stabilization. Phase diagrams presenting the conditions under which precipitation is inhibited are established. The nanoparticles are then characterized in terms of sizes, morphologies and surface charges. The main parameters controlling the size were identified: the copolymer-to-metal ratio and the metal prehydrolysis ratio. The synthesis steps were characterized. First, a key step of induced micellization of the hydrophilic copolymers leads to hybrid core-shell assemblies. The second step consists in mineralization of the micellar core. The suspension polycondensation leads to hairy particles whose morphologies depend on the nature of the metal and on synthesis parameters.

scholarly journals Ionic conductivity of deep eutectic solvents: the role of orientational dynamics and glassy freezing

2019 ◽  
Vol 21 (13) ◽  
pp. 6801-6809 ◽  
Author(s):  
Daniel Reuter ◽  
Catharina Binder ◽  
Peter Lunkenheimer ◽  
Alois Loidl
Keyword(s):  
Ionic Conductivity ◽  
Dielectric Spectroscopy ◽  
Deep Eutectic Solvents ◽  
Relaxation Dynamics ◽  
Dipolar Relaxation ◽  
Orientational Dynamics

Dielectric spectroscopy reveals that the ionic conductivity of deep eutectic solvents is closely coupled to their reorientational dipolar relaxation dynamics.

The Role of Deep Defect Relaxation Dynamics in Optical Processes in Hydrogenated Amorphous Silicon

1995 ◽  
Vol 377 ◽  
Author(s):  
Fan Zhong ◽  
J. David Cohen
Keyword(s):  
Relaxation Dynamics ◽  
Energy Position ◽  
Defect Band ◽  
Transient Photoconductivity ◽  
Photoconductivity Decay ◽  
Long Time ◽  
Intimate Relation ◽  
Hydrogenated Amorphous ◽  
Defect Relaxation

ABSTRACTWe report results of a transient modulated photocurrent technique which allows us to observe the time evolution of the D0 sub-band under the application of optical bias light and after turning off this bias light Our measurements show that the D0 band shifts monotonically to shallower thermal energies after the bias light is applied, with roughly 10 seconds to saturation at 300K and to deeper thermal energies after removing the bias light, with a decay time of over 1000 seconds. We have also found there exists an intimate relation between the motion of the D0 band and that of the quasi Fermi level as deduced from the transient photoconductivity and therefore, in particular, to the long time photoconductivity decay. This relation is exactly reproduced by the assumption of a D0 band whose energy position evolves in time, together with a recombination process dominated by changes in the charge state of a deeper defect band under light bias.

The role of amplified spontaneous emission in the ultrafast relaxation dynamics of polymer films

1998 ◽  
Vol 289 (1-2) ◽  
pp. 205-210 ◽  
Author(s):  
S. Stagira ◽  
M. Nisoli ◽  
G. Cerullo ◽  
M. Zavelani–Rossi ◽  
S. De Silvestri ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Polymer Films ◽  
Amplified Spontaneous Emission ◽  
Relaxation Dynamics ◽  
Ultrafast Relaxation

The role of CN and CO ligands in the vibrational relaxation dynamics of model compounds of the [FeFe]-hydrogenase enzyme

2011 ◽  
Vol 13 (21) ◽  
pp. 10295 ◽  
Author(s):  
Spyridon Kaziannis ◽  
Joseph A. Wright ◽  
Marco Candelaresi ◽  
Rafal Kania ◽  
Gregory M. Greetham ◽  
...  
Keyword(s):  
Vibrational Relaxation ◽  
Relaxation Dynamics ◽  
Model Compounds ◽  
Hydrogenase Enzyme

scholarly journals Cytotoxicity of surface-functionalized silicon and germanium nanoparticles: the dominant role of surface charges

Nanoscale ◽  
2013 ◽  
Vol 5 (11) ◽  
pp. 4870 ◽  
Author(s):  
Sourav Bhattacharjee ◽  
Ivonne M. C. M. Rietjens ◽  
Mani P. Singh ◽  
Tonya M. Atkins ◽  
Tapas K. Purkait ◽  
...  
Keyword(s):  
Dominant Role ◽  
Surface Charges ◽  
Silicon And Germanium ◽  
Germanium Nanoparticles

Relaxation dynamics of simple glass-formers: The role of timescale separation and activated dynamics at the metabasin level

2005 ◽  
Vol 2 (10) ◽  
pp. 3532-3535 ◽  
Author(s):  
G. A. Appignanesi ◽  
J. A. Rodriguez Fris ◽  
L. M. Alarcón ◽  
M. A. Frechero ◽  
R. A. Montani
Keyword(s):  
Relaxation Dynamics
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