Unusual High-Temperature Reversible Phase-Transition Behavior, Structures, and Dielectric–Ferroelectric Properties of Two New Crown Ether Clathrates

2015 ◽  
Vol 137 (41) ◽  
pp. 13345-13351 ◽  
Author(s):  
Yun-Zhi Tang ◽  
Yin-Mei Yu ◽  
Jian-Bo Xiong ◽  
Yu-Hui Tan ◽  
He-Rui Wen
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Crown Ether ◽  
Ferroelectric Properties ◽  
Phase Transition Behavior ◽  
Transition Behavior ◽  
Reversible Phase Transition ◽  
Reversible Phase

Unusual high-temperature reversible phase transition containing dielectric and nonlinear optical switches in host–guest supramolecular crown ether clathrates

2018 ◽  
Vol 54 (58) ◽  
pp. 8076-8079 ◽  
Author(s):  
Yan-Li Wei ◽  
Jing Jing ◽  
Chao Shi ◽  
Heng-Yun Ye ◽  
Zhong-Xia Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Crown Ether ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Optical Switches ◽  
Reversible Phase Transition ◽  
Switching Material ◽  
Reversible Phase

[(C6H5NF2)(18-crown-6)][HClO4] is a novel high-temperature dielectric and nonlinear optical switching material based on crown ether clathrates.

scholarly journals Stimuli-Responsive Nanodiamond–Polyelectrolyte Composite Films

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 507 ◽  
Author(s):  
Tony Tiainen ◽  
Marina Lobanova ◽  
Erno Karjalainen ◽  
Heikki Tenhu ◽  
Sami Hietala
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Composite Films ◽  
Complexing Agent ◽  
Mechanical And Thermal Properties ◽  
Stimuli Responsive ◽  
Phase Transition Behavior ◽  
Thermally Induced ◽  
Reversible Phase Transition ◽  
Reversible Phase

Nanodiamonds (NDs) can considerably improve the mechanical and thermal properties of polymeric composites. However, the tendency of NDs to aggregate limits the potential of these non-toxic, mechanically- and chemically-robust nanofillers. In this work, tough, flexible, and stimuli-responsive polyelectrolyte films composed of cross-linked poly(butyl acrylate-co-dimethylaminoethyl methacrylate) (P(BA-co-DMAEMA)) were prepared by photopolymerization. The effects of the added carboxylate-functionalized NDs on their mechanical and stimuli-responsive properties were studied. When the negatively charged NDs were added to the polymerization media directly, the mechanical properties of the films changed only slightly, because of the uneven distribution of the aggregated NDs in the films. In order to disperse and distribute the NDs more evenly, a prepolymerized polycation block copolymer complexing agent was used during the photopolymerization process. This approach improved the mechanical properties of the films and enhanced their thermally-induced, reversible phase-transition behavior.

Analysis of phase transition behavior of BaCeO3 with thermal analyses and high temperature X-ray diffraction

2009 ◽  
Vol 180 (17-19) ◽  
pp. 1034-1039 ◽  
Author(s):  
Takeshi Ohzeki ◽  
Shinya Hasegawa ◽  
Misa Shimizu ◽  
Takuya Hashimoto
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Thermal Analyses ◽  
X Ray Diffraction ◽  
Phase Transition Behavior ◽  
X Ray ◽  
Transition Behavior

scholarly journals Above Room Temperature Reversible Phase Transition Induces Distinct Dielectric and Nonlinear Optical Switching Response Behavior in Crown-Ether-Based Supramolecular Clathrate

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 184 ◽  
Author(s):  
Jing Jing ◽  
Fan Jiang ◽  
Yan-Li Wei ◽  
Chao Shi ◽  
Heng-Yun Ye ◽  
...  
Keyword(s):  
Phase Transition ◽  
Crown Ether ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Thermal Hysteresis ◽  
Switching Behavior ◽  
Stimuli Responsive ◽  
Scanning Calorimetry ◽  
Reversible Phase Transition ◽  
Reversible Phase

Stimuli-responsive materials with coexisting nonlinear optical (NLO) and dielectric properties are technologically important, which enable simultaneous conversion of optoelectronic properties between different states under external stimuli. By rationally screening guest cations (C6H5NF2)+ in the crown-ether inclusion system, we synthesized a crown-ether supramolecular compound [(C6H5NF2)(18-crown-6)][PF6] (1). Differential scanning calorimetry (DSC) showed that 1 undergoes a reversible phase transition above room temperatures (305 K/292 K), with a thermal hysteresis of 13 K. Temperature-dependent dielectric and NLO measurements show that the compound exhibits two distinct switching response behaviors. Structural analysis indicates that the order–disorder change of the host molecule 18-crown-6 and the guest organic cation during the phase transition induces the dielectric and NLO switching behavior of the compound.

Two In-Based Organic−Inorganic Hybrid Compounds with Reversible Phase Transition Derived from Order-Disorder Changes of Cations or Anions

2021 ◽  
Author(s):  
Yin-Qiang Zhang ◽  
Guan-Cheng Xu ◽  
Min Li
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Physical Properties ◽  
Ferroelectric Properties ◽  
Inorganic Hybrid ◽  
Hybrid Compounds ◽  
Reversible Phase Transition ◽  
Reversible Phase

Solid-state phase transition materials have been received extraordinary interest due to their rich physical properties, such as the thermal, dielectric, and ferroelectric properties. Here, two In-based organic-inorganic hybrid compounds, (C6H5CH2CH2NH3)3[InBr5(H2O)]...

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