scholarly journals Macroscopic crystalline deformation in an organic dye during reversible phase transition caused by alkyl disorder

CrystEngComm ◽  
2018 ◽  
Vol 20 (19) ◽  
pp. 2644-2647 ◽  
Author(s):  
Takaya Minami ◽  
Hiroyasu Sato ◽  
Shinya Matsumoto
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Organic Dye ◽  
Thermally Induced ◽  
Reversible Phase Transition ◽  
Reversible Phase

Single crystals of a bisazomethine dye exhibit thermally induced reversible crystalline deformation due to alkyl disorder.

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.

Temperature-Dependent Solid-state Luminescence and Reversible Phase Transition of (n-Bu4N)[Au(SC6H3-3,5-Me2)2]

2003 ◽  
Vol 32 (11) ◽  
pp. 1002-1003 ◽  
Author(s):  
Seiji Watase ◽  
Takayuki Kitamura ◽  
Nobuko Kanehisa ◽  
Masami Nakamoto ◽  
Yasushi Kai ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Temperature Dependent ◽  
Reversible Phase Transition ◽  
Reversible Phase ◽  
State Luminescence

Photoinduced reversible phase transition of azobenzene-containing polydiacetylene crystals

2016 ◽  
Vol 52 (97) ◽  
pp. 14059-14062 ◽  
Author(s):  
Woohyun Baek ◽  
Jung-Moo Heo ◽  
Seungwhan Oh ◽  
Sang-hwa Lee ◽  
Jaeyong Kim ◽  
...  
Keyword(s):  
Phase Transition ◽  
Reversible Phase Transition ◽  
Reversible Phase

A photoinduced reversible phase transition with a simultaneous crystal tearing phenomenon was observed in an azobenzene-containing supramolecular polydiacetylene (PDA) crystal.

Preparation of PVA/PEG Phase Change Composite Nanofibers by Electrospinning

2011 ◽  
Vol 306-307 ◽  
pp. 37-40 ◽  
Author(s):  
Da Hui Sun ◽  
Tian Yu Xu ◽  
Yong Jia Liu ◽  
Mei Zhang
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Composite Nanofibers ◽  
Diameter Distribution ◽  
Weight Percentage ◽  
Weight Content ◽  
Reversible Phase Transition ◽  
Change Characteristics ◽  
Micro Morphology ◽  
Reversible Phase

Phase change PVA / PEG composite nanofibers were prepared by electrospinning, micro-morphology of PVA / PEG fibers with different weight content were analyzed, the phase change characteristics were also analyzed. The result showed that well distributed composite nanofibers which composed by PVA/PEG blend solution can be obtained by electrospinning.PVA fibreforming were influenced because of the existence of PEG, including bond, irregular block, small rough, uneven diameter distribution in fibers. PVA/PEG blend solution of 4:6 weight content was well fibreforming compared with other different weight content.The continuity of spinneret flow in electrospinning would directly affected by polymer solution consentrition and viscosity. Further research about which and the influence in fibers diameter and morphology will be explored. Composite nanofibers possessed reversible phase transition characteristics,Tm Essentially unchanged ,Tcwere related to the weight percentage of PEG/PVA, at the same time, the enthalpy will increase along with the gradually increase in weight percentage of PEG.

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