scholarly journals Photochromic Dyes for Smart Textiles

2021 ◽  
Author(s):  
Virendra Kumar Gupta
Keyword(s):  
Molecular Species ◽  
Heat Effect ◽  
Color Change ◽  
Optical Switch ◽  
Optical Data ◽  
Commercial Application ◽  
Smart Textiles ◽  
Photochromic Molecules ◽  
Protective Fabrics ◽  
Photochromic Materials

Photochromism is a light induced reversible color change phenomenon in photochromic molecule due to light and heat effect and molecular species exist in two forms which have different absorption spectra. The fascinating color change by photochromic molecules in response to specific wavelength of light produces number of applications such as U.V. protective fabrics, ophthalmic photochromic lenses, optical data storing, optical switch, sensors and display. This chapter provides a brief and conclusive review of photochromism their mechanism and application in Textiles. Although photochromic materials are in use since 1960 in lenses and sunglasses, but the development is slow due to technical difficulties and poor commercial application. Now there is renewed interest in photochromic materials which are used in nanofibers in smart textiles and in allied items.

Solid-state Reversible Optical Switch Based on Two Dendritic Molecules with dual sensitivity of mechanochromism and photochromism

2021 ◽  
Author(s):  
Yuhui Yang ◽  
Zhe He ◽  
Junzhao He ◽  
Yuqing Li ◽  
Yilong Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Optical Switch ◽  
New Method ◽  
Photochromic Molecules ◽  
Conformational Freedom

Efficient isomerization of photochromic molecules requires conformational freedom and is often limited to the solution or polymer matrix. Thus, developing a new method to improve photochromism in the solid state...

Rewritable Spiropyran/Polyacrylonitrile Hybrid Nanofiber Membrane Prepared by Electrospinning

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050013 ◽  
Author(s):  
Bingwei Bao ◽  
Ji Fan ◽  
Rui Xu ◽  
Wei Wang ◽  
Dan Yu
Keyword(s):  
Color Change ◽  
Uv Light ◽  
Dimethyl Fumarate ◽  
Gravimetric Analysis ◽  
Nanofiber Membrane ◽  
Good Thermal Stability ◽  
Fast Switching ◽  
Hybrid Nanofiber ◽  
Nanofiber Film ◽  
Photochromic Materials

Photochromic materials aroused enormous interest due to their potential application for rewritable paper, smart labeling and sensor devices. In this paper, we proposed to dissolve spiropyran (SP, photochromic material) and polyacrylonitrile (PAN, polymer matrix) in dimethyl fumarate (DMF) to prepare photochromic nanofibers by electrospinning. The target SP compounds were featured by FTIR, ultraviolet (UV) and 1HNMR, and the nanofibers were characterized by FTIR, UV-vis spectra, scanning electron microscope (SEM), thermal gravimetric analysis (TGA) and contact angle (CA). The test results demonstrated that photochromic SP was synthesized successfully, and the nanofiber membrane possesses extraordinary color-converting properties including obvious color change from white to purple, reversible fast switching between two colors when exposed to UV light and achieve maximum color change in 1[Formula: see text]min, and switchable hydrophilic and hydrophobic properties as well as excellent photo-fatigue resistance over 20 cycles. In addition, it has good thermal stability allowing it to be used under harsh conditions. In view of the above characteristics, we believe that the as-prepared nanofiber film will be a promising reusable writing substrate.

A2BA2-Type Amphiphilic Liquid Crystalline Block Copolymers by ATRP: Synthesis and Characterization

2010 ◽  
Vol 428-429 ◽  
pp. 154-157 ◽  
Author(s):  
Xin De Tang ◽  
Nian Feng Han ◽  
Jing Xu
Keyword(s):  
Block Copolymers ◽  
Data Storage ◽  
Liquid Crystalline ◽  
Optical Switch ◽  
Gel Permeation Chromatography ◽  
Optical Data Storage ◽  
Optical Data ◽  
Esterification Reaction ◽  
Scanning Calorimetry ◽  
Hexyl Methacrylate

A2BA2-type amphiphilic liquid crystalline block copolymers containing azobenzene were synthesized by atom transfer radical polymerization (ATRP). The macroinitiator prepared by the esterification reaction between poly(ethylene glycol) (PEG) and 2,2-dichloroacetyl chloride was used to initiate the ATRP of 6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate (M6C). The resulting macroinitiator and block copolymers were characterized by 1H NMR, gel permeation chromatography (GPC). Polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) preliminarily revealed the liquid crystalline property of these block copolymers. These novel amphiphilic liquid crystalline block copolymers are promising in some areas, such as optical data storage, optical switch, and molecular devices.

Optical data center switches design and analysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Anjaney Nigam ◽  
Bharat Mishra ◽  
Prabhat Patel
Keyword(s):  
Optical Communication ◽  
Packet Loss ◽  
Data Center ◽  
High Speed ◽  
Data Centers ◽  
Optical Switch ◽  
Loss Probability ◽  
Optical Data ◽  
High Speed Data ◽  
Switch Design

Abstract Data centers are facing huge bottlenecks due to the emergence of high-speed data applications. To meet speed requirements, it is proposed to shift the current technologies toward optical communication-enabled data center (DC) devices. This paper discusses the recently proposed optical switch designs and proposes a novel switch design for optical DCs. The architectures proposed in the literature are compared in terms of notable parameters. Finally, proposed switch performance is measured in the network using Monte Carlo simulation and results are obtained in terms of packet loss probability, under a random traffic model while considering both nonperiodized and prioritized packets.

scholarly journals Smart nanoporous metal–organic frameworks by embedding photochromic molecules – state of the art and future perspectives

2018 ◽  
Vol 17 (7) ◽  
pp. 864-873 ◽  
Author(s):  
H. A. Schwartz ◽  
U. Ruschewitz ◽  
L. Heinke
Keyword(s):  
Thin Films ◽  
State Of The Art ◽  
Metal Organic Frameworks ◽  
Stimuli Responsive ◽  
Future Perspectives ◽  
Nanoporous Metal ◽  
Photochromic Molecules ◽  
Metal Organic ◽  
Photochromic Materials

The opportunities, properties and perspectives of smart photochromic materials, which are obtained by embedment of stimuli-responsive molecules in nanoporous MOFs (metal–organic frameworks), both in bulk and in thin films, are reviewed.

TERAHERTZ OPTICAL ASYMMETRIC DEMULTIPLEXER BASED ALL OPTICAL DATA COMPARATOR

2010 ◽  
Vol 19 (03) ◽  
pp. 671-682 ◽  
Author(s):  
DILIP KUMAR GAYEN ◽  
CHINMOY TARAPHDAR ◽  
JITENDRA NATH ROY ◽  
RAJAT KUMAR PAL
Keyword(s):  
Binary Data ◽  
Optical Switch ◽  
Full Adder ◽  
Optical Data ◽  
Binary Number ◽  
Central Processor ◽  
Central Processor Unit ◽  
All Optical ◽  
Processor Unit ◽  
Terahertz Optical Asymmetric Demultiplexer

An all-optical data comparator with the help of Terahertz Optical Asymmetric Demultiplexer (TOAD) is proposed. The paper describes the all-optical data comparator by using a set of all-optical full-adder and optical switch. Comparison between two binary data is required in many data processing systems. It is sometimes necessary to know whether a binary number is greater than, equal to, or less than another number. The all-optical data comparator can be used to perform a fast central processor unit using optical hardware components. In this present communication, we have tried to exploit the advantages of TOAD-based switch to design an integrated all-optical circuit which can perform data comparison operations.

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