Molecular Motion, Dielectric Response, and Phase Transition of Charge-Transfer Crystals: Acquired Dynamic and Dielectric Properties of Polar Molecules in Crystals

2015 ◽  
Vol 137 (13) ◽  
pp. 4477-4486 ◽  
Author(s):  
Jun Harada ◽  
Masaki Ohtani ◽  
Yukihiro Takahashi ◽  
Tamotsu Inabe
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Dielectric Properties ◽  
Dielectric Response ◽  
Molecular Motion ◽  
Polar Molecules

Influence of Iodine on Low Frequency Dielectric Properties of Anthrone

1995 ◽  
Vol 60 (11) ◽  
pp. 1809-1814
Author(s):  
Grzegorz W. Bak ◽  
Marian Kryszewski
Keyword(s):  
Charge Transfer ◽  
Dielectric Properties ◽  
Dielectric Response ◽  
Charge Transfer Complex ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Low Loss ◽  
Remarkable Change ◽  
Ct Complex

Low frequency dielectric properties of polycrystalline anthrone and anthrone/iodine charge-transfer complex are presented. Polycrystalline anthrone proves to be a typical low-loss material. Iodization of anthrone pellets leads to a remarkable change in dielectric properties. Dielectric response of anthrone/iodine CT complex shows comparatively strong low frequency dispersion. The change in dielectric properties proves to be reversible to great extend as removing of iodine by heating at 373 K for a few hours almost completely restores the dielectric values of a virgin anthrone sample.

Crystals of Charge-Transfer Complexes with Reorienting Polar Molecules: Dielectric Properties and Order–Disorder Phase Transitions

2018 ◽  
Vol 19 (1) ◽  
pp. 291-299 ◽  
Author(s):  
Jun Harada ◽  
Naho Yoneyama ◽  
Shota Sato ◽  
Yukihiro Takahashi ◽  
Tamotsu Inabe
Keyword(s):  
Phase Transitions ◽  
Charge Transfer ◽  
Dielectric Properties ◽  
Charge Transfer Complexes ◽  
Polar Molecules

scholarly journals The Primary Origin of Excellent Dielectric Properties of (Co, Nb) Co-Doped TiO2 Ceramics: Electron-Pinned Defect Dipoles vs. Internal Barrier Layer Capacitor Effect

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3230
Author(s):  
Theeranuch Nachaithong ◽  
Narong Chanlek ◽  
Pairot Moontragoon ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Loss Tangent ◽  
Barrier Layer ◽  
Dielectric Response ◽  
High Resistivity ◽  
Low Loss ◽  
Rutile Tio2 ◽  
Complex Defect ◽  
Very High ◽  
Co Doped

(Co, Nb) co-doped rutile TiO2 (CoNTO) nanoparticles with low dopant concentrations were prepared using a wet chemistry method. A pure rutile TiO2 phase with a dense microstructure and homogeneous dispersion of the dopants was obtained. By co-doping rutile TiO2 with 0.5 at.% (Co, Nb), a very high dielectric permittivity of ε′ » 36,105 and a low loss tangent of tanδ » 0.04 were achieved. The sample–electrode contact and resistive outer-surface layer (surface barrier layer capacitor) have a significant impact on the dielectric response in the CoNTO ceramics. The density functional theory calculation shows that the 2Co atoms are located near the oxygen vacancy, creating a triangle-shaped 2CoVoTi complex defect. On the other hand, the substitution of TiO2 with Nb atoms can form a diamond-shaped 2Nb2Ti complex defect. These two types of complex defects are far away from each other. Therefore, the electron-pinned defect dipoles cannot be considered the primary origins of the dielectric response in the CoNTO ceramics. Impedance spectroscopy shows that the CoNTO ceramics are electrically heterogeneous, comprised of insulating and semiconducting regions. Thus, the dielectric properties of the CoNTO ceramics are attributed to the interfacial polarization at the internal insulating layers with very high resistivity, giving rise to a low loss tangent.

scholarly journals Reconfigurable artificial microswimmers with internal feedback

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
L. Alvarez ◽  
M. A. Fernandez-Rodriguez ◽  
A. Alegria ◽  
S. Arrese-Igor ◽  
K. Zhao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Light Absorption ◽  
Local Heating ◽  
Volume Phase Transition ◽  
Active Materials ◽  
Colloidal Clusters ◽  
Robotic Devices ◽  
Dynamical Control ◽  
Synthetic Models

AbstractSelf-propelling microparticles are often proposed as synthetic models for biological microswimmers, yet they lack the internally regulated adaptation of their biological counterparts. Conversely, adaptation can be encoded in larger-scale soft-robotic devices but remains elusive to transfer to the colloidal scale. Here, we create responsive microswimmers, powered by electro-hydrodynamic flows, which can adapt their motility via internal reconfiguration. Using sequential capillary assembly, we fabricate deterministic colloidal clusters comprising soft thermo-responsive microgels and light-absorbing particles. Light absorption induces preferential local heating and triggers the volume phase transition of the microgels, leading to an adaptation of the clusters’ motility, which is orthogonal to their propulsion scheme. We rationalize this response via the coupling between self-propulsion and variations of particle shape and dielectric properties upon heating. Harnessing such coupling allows for strategies to achieve local dynamical control with simple illumination patterns, revealing exciting opportunities for developing tactic active materials.

Phase transition and dielectric properties of (Pb,La)(Zr,Sn,Ti)O3 ceramics at morphotropic phase boundary

2016 ◽  
Vol 673 ◽  
pp. 67-72 ◽  
Author(s):  
Xiucai Wang ◽  
Tongqing Yang ◽  
Jie Shen ◽  
Ying Dong ◽  
YaoZe Liu
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary

Possible low-temperature phase transition of Langmuir–Blodgett films of a charge–transfer complex detected by ESR

1998 ◽  
Vol 327-329 ◽  
pp. 391-394
Author(s):  
Keiichi Ikegami ◽  
Shin-ichi Kuroda ◽  
Tomoyuki Akutagawa ◽  
Taro Konuma ◽  
Takayoshi Nakamura ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Low Temperature ◽  
Charge Transfer Complex ◽  
Temperature Phase ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Temperature Phase Transition ◽  
A Charge ◽  
Low Temperature Phase

Phase transition and molecular motion of cyclohexane confined in metal-organic framework, IRMOF-1, as studied by 2H NMR

2007 ◽  
Vol 443 (4-6) ◽  
pp. 293-297 ◽  
Author(s):  
Takahiro Ueda ◽  
Kenji Kurokawa ◽  
Hiroaki Omichi ◽  
Keisuke Miyakubo ◽  
Taro Eguchi
Keyword(s):  
Phase Transition ◽  
Molecular Motion ◽  
Metal Organic Framework ◽  
2H Nmr ◽  
Metal Organic ◽  
Organic Framework
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