A novel red to transmissive electrochromic polymer based on phenanthrocarbazole

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25620-25623 ◽  
Author(s):  
G. Atakan ◽  
G. Gunbas
Keyword(s):  
Optical Contrast ◽  
Fast Switching ◽  
Switching Times ◽  
Electrochromic Polymer

This work describes the synthesis of a novel red to transmissive electrochromic polymer with high optical contrast and fast switching times.

scholarly journals Side-chain engineering of green color electrochromic polymer materials: toward adaptive camouflage application

2016 ◽  
Vol 4 (12) ◽  
pp. 2269-2273 ◽  
Author(s):  
Hongtao Yu ◽  
Shan Shao ◽  
Lijia Yan ◽  
Hong Meng ◽  
Yaowu He ◽  
...  
Keyword(s):  
High Stability ◽  
Strong Absorption ◽  
Polymer Materials ◽  
Side Chain ◽  
Green Color ◽  
Fast Switching ◽  
Switching Times ◽  
Electrochromic Polymers ◽  
Electrochromic Polymer ◽  
Brown Color

The synthesised electrochromic polymers can exhibit a vegetable-green color at lower applied voltages and a soil-brown color in the oxidized-state, excellent solubility, superhydrophobicity, strong absorption, very fast switching times, and high stability.

Design Method for Fast Switching Seat Valves for Digital Displacement® Machines

2014 ◽  
Author(s):  
Daniel B. Roemer ◽  
Per Johansen ◽  
Henrik C. Pedersen ◽  
Torben O. Andersen
Keyword(s):  
Pressure Loss ◽  
Design Method ◽  
Thermal Dissipation ◽  
Valve Design ◽  
Stroke Length ◽  
Efficient Operation ◽  
Fast Switching ◽  
Switching Times ◽  
High Bandwidth ◽  
Electro Magnetic

Digital Displacement® (DD) machines are upcoming technology where the displacement of each pressure chamber is controlled electronically by use of two fast switching seat valves. The effective displacement and operation type (pumping/motoring) may be controlled by manipulating the seat valves corresponding to the piston movement, which has been shown to facilitate superior part load efficiency combined with high bandwidth compared to traditional displacement machines. However, DD machines need fast switching on-off valves with low pressure loss for efficient operation, especially in fast rotating operation, where switching times must be performed within a few milliseconds. These valve requirements make a simulation based design approach essential, where mechanical strength, thermal dissipation, fluid dynamics and electro-magnetic dynamics must be taken into account. In this paper a complete design method for DD seat valves are presented, taking into account the significant aspects related to obtaining efficient DD valves with basis in a given DD machine specifications. The seat area is minimized and the stroke length is minimized to obtain fast switching times while considering the pressure loss of the valves. A coupled optimization is finally conducted to optimize the electro-magnetic actuator, leading to a valve design based on the chosen valve topology. The design method is applied to an example DD machine and the resulting valve design fulfilling the requirements is presented.

Ferroelektrische Flüssigkristall - Mischungen mit Kohlenhydrat - Derivaten als Dotierstoffe / Ferroelectric Liquid Crystal Mixtures with Carbohydrate Derivates as Dopants

1989 ◽  
Vol 44 (7) ◽  
pp. 675-679 ◽  
Author(s):  
V. Vill ◽  
F. Fischer ◽  
J. Thiem
Keyword(s):  
Liquid Crystal ◽  
Chiral Center ◽  
Ferroelectric Liquid Crystal ◽  
Fast Switching ◽  
Switching Times ◽  
Smectic Phases ◽  
First Time ◽  
Helical Twisting Power

Abstract For the first time carbohydrate derivatives were studied as dopants for calamitic smectic phases. Fast switching ferroelectric cells could be realized, and electroclinic effects were observed. By inversion of configuration at a chiral center of these compounds switching times, solubility, and helical twisting power vary by orders of magnitude. The studied derivatives showed modest solubility properties.

Nanostructured metallo-supramolecular polymer-based gel-type electrochromic devices with ultrafast switching time and high colouration efficiency

2019 ◽  
Vol 7 (10) ◽  
pp. 2871-2879 ◽  
Author(s):  
Susmita Roy ◽  
Chanchal Chakraborty
Keyword(s):  
Switching Time ◽  
Supramolecular Polymer ◽  
Electrochromic Devices ◽  
Switching Times ◽  
Polymer Nanostructures ◽  
Ultrafast Switching ◽  
Electrochromic Polymer

Herein, we fabricated the ordered polymer nanostructures by compositing the electrochromic polymer polyFe to significantly improve the colouration efficiency and switching times.

Study on Electrochromic Performance of the Copolymer Based on 4-(1H-Pyrrol-1-Yl) Phenyl 4-(1H-Pyrrol-1-Yl) Butanoate with 3,4-Ethylenedioxythiophene

2011 ◽  
Vol 335-336 ◽  
pp. 929-933
Author(s):  
Mi Ou Yang ◽  
Xiao Jing Lv ◽  
Bin Hu ◽  
Cheng Zhang
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Method ◽  
Switching Time ◽  
13C Nmr Spectroscopy ◽  
Copolymer Film ◽  
Cyclic Voltammogram ◽  
Optical Contrast ◽  
1H And 13C Nmr ◽  
Fast Switching ◽  
Reversible Redox

A new polypyrrole derivative 4-(1H-pyrrol-1-yl) phenyl 4-(1H-pyrrol-1-yl) butanoate (NPB) was synthesized by chemical method and characterized by 1H and 13C NMR spectroscopy. A new copolymer based on NPB and 3,4-ethylenedioxythiophene(EDOT) was electrochemically synthesized. Cyclic voltammogram and spectroelectrochemical characterization showed that the copolymer film had a well-defined reversible redox process as well as electrochromic behavior. Moreover, the copolymer film exhibited a multicolor electrochromism at different potentials, fast switching time of 0.8 s at 365 nm and an optical contrast of 17% at 1100nm.

High-performance electrochromic films with fast switching times using transparent/conductive nanoparticle-modulated charge transfer

Nanoscale ◽  
2019 ◽  
Vol 11 (38) ◽  
pp. 17815-17830 ◽  
Author(s):  
Junsang Yun ◽  
Yongkwon Song ◽  
Ikjun Cho ◽  
Yongmin Ko ◽  
Cheong Hoon Kwon ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
High Performance ◽  
Transition Metal Oxide ◽  
Fast Switching ◽  
Switching Times

Facile charge transfer-induced structural/interfacial designs for high-performance transition metal oxide-based electrochromic films.

Thiadiazolo[3,4-c]pyridine as an Acceptor toward Fast-Switching Green Donor–Acceptor-Type Electrochromic Polymer with Low Bandgap

2015 ◽  
Vol 7 (21) ◽  
pp. 11089-11098 ◽  
Author(s):  
Shouli Ming ◽  
Shijie Zhen ◽  
Kaiwen Lin ◽  
Li Zhao ◽  
Jingkun Xu ◽  
...  
Keyword(s):  
Low Bandgap ◽  
Fast Switching ◽  
Donor Acceptor ◽  
Electrochromic Polymer

Cyclopentadithiophene and Diketo-pyrrolo-pyrrole fused rigid copolymer for high optical contrast electrochromic polymer

2019 ◽  
Vol 27 (1) ◽  
Author(s):  
Kanpitcha Jiramitmongkon ◽  
Chuleekorn Chotsuwan ◽  
Udom Asawapirom ◽  
Pussana Hirunsit
Keyword(s):  
Optical Contrast ◽  
Electrochromic Polymer

Liquid-crystal varactors with fast switching times for microwave applications

2008 ◽  
Vol 44 (7) ◽  
pp. 480 ◽  
Author(s):  
F. Goelden ◽  
A. Gaebler ◽  
S. Mueller ◽  
A. Lapanik ◽  
W. Haase ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fast Switching ◽  
Switching Times ◽  
Microwave Applications

Fast switching times of KD2PO4-KH2AsO4ferroelectric domains monitored by ESR

1983 ◽  
Vol 28 (9) ◽  
pp. 5268-5272 ◽  
Author(s):  
Roger D. Truesdale ◽  
Horacio A. Farach ◽  
Charles P. Poole
Keyword(s):  
Fast Switching ◽  
Switching Times
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