scholarly journals Reprocessable Photodeformable Azobenzene Polymers

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4455
Author(s):  
Huiqi Zhang
Keyword(s):  
Recent Progress ◽  
Polymer Networks ◽  
Great Promise ◽  
Smart Polymers ◽  
Parameter Change ◽  
Azo Polymers ◽  
Crosslinked Polymer ◽  
Configuration Change ◽  
Stable Chemical ◽  
Macroscopic Deformation

Photodeformable azobenzene (azo) polymers are a class of smart polymers that can efficiently convert light energy into mechanical power, holding great promise in various photoactuating applications. They are typically of crosslinked polymer networks with highly oriented azo mesogens embedded inside. Upon exposure to the light of appropriate wavelength, they experience dramatic order parameter change following the configuration change of the azo units. This could result in the generation and accumulation of the gradient microscopic photomechanical force in the crosslinked polymer networks, thus leading to their macroscopic deformation. So far, a great number of photodeformable azo polymers have been developed, including some unoriented ones showing photodeformation based on different mechanisms. Among them, photodeformable azo polymers with dynamic crosslinking networks (and some uncrosslinked ones) have aroused particular interest recently because of their obvious advantages over those with stable chemical crosslinking structures such as high recyclability and reprocessability. In this paper, I provide a detailed overview of the recent progress in such reprocessable photodeformable polymers. In addition, some challenges and perspectives are also presented.

Shape-changing polymers for biomedical applications

2019 ◽  
Vol 7 (10) ◽  
pp. 1597-1624 ◽  
Author(s):  
Alina Kirillova ◽  
Leonid Ionov
Keyword(s):  
Biomedical Applications ◽  
Recent Progress ◽  
Smart Polymers ◽  
Shape Morphing ◽  
Shape Transformations ◽  
Biomedical Field ◽  
External Stimuli ◽  
Significant Attention

Smart polymers that are capable of controlled shape transformations under external stimuli have attracted significant attention in the recent years due to the resemblance of this behavior to the biological intelligence observed in nature. In this review, we focus on the recent progress in the field of shape-morphing polymers, highlighting their most promising applications in the biomedical field.

Modelling interwall interactions in carbon nanotubes: fundamentals and device applications

2007 ◽  
Vol 365 (1861) ◽  
pp. 2893-2906 ◽  
Author(s):  
Elena Bichoutskaia
Keyword(s):  
Carbon Nanotubes ◽  
Relative Motion ◽  
Recent Progress ◽  
Self Regulation ◽  
Building Blocks ◽  
Great Promise ◽  
Low Friction ◽  
Fundamental Understanding ◽  
Device Applications ◽  
Physical Manipulation

Carbon nanotubes are the most commonly used ‘building blocks’ of modern nanotechnology. Their unique mechanical and electronic properties, stability and functionality show great promise in creating functional devices on the nanometre scale. One of the great challenges in using this scale is the ability of physical manipulation of the components, such as their positioning and assembling. Strong correlation between the structure and mechanical interactions of the walls of carbon nanotubes provides self-regulation of their relative motion. This can be further exploited in low-friction and high-stiffness devices. In this paper, we present a condensed overview of the recent progress in fundamental understanding of nanomechanical and nanoelectromechanical behaviour of carbon nanotubes and their applications in nanodevices.

Unusual Mechanical Performance of Amphiphilic Crosslinked Polymer Networks

2007 ◽  
Vol 129 (3) ◽  
pp. 506-507 ◽  
Author(s):  
Jinqi Xu ◽  
David A. Bohnsack ◽  
Michael E. Mackay ◽  
Karen L. Wooley
Keyword(s):  
Mechanical Performance ◽  
Polymer Networks ◽  
Crosslinked Polymer

scholarly journals Recent Progress on the Electrochemical Biosensing of Escherichia coli O157:H7: Material and Methods Overview

Biosensors ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 54 ◽  
Author(s):  
Nasrin Razmi ◽  
Mohammad Hasanzadeh ◽  
Magnus Willander ◽  
Omer Nur
Keyword(s):  
Escherichia Coli ◽  
Pathogen Detection ◽  
Recent Progress ◽  
Electrochemical Sensors ◽  
Solid Phase ◽  
Great Promise ◽  
Escherichia Coli O157 ◽  
E Coli ◽  
Electrochemical Biosensing ◽  
Sensitivity And Selectivity

Escherichia coli O157:H7 (E. coli O157:H7) is a pathogenic strain of Escherichia coli which has issued as a public health threat because of fatal contamination of food and water. Therefore, accurate detection of pathogenic E. coli is important in environmental and food quality monitoring. In spite of their advantages and high acceptance, culture-based methods, enzyme-linked immunosorbent assays (ELISAs), polymerase chain reaction (PCR), flow cytometry, ATP bioluminescence, and solid-phase cytometry have various drawbacks, including being time-consuming, requiring trained technicians and/or specific equipment, and producing biological waste. Therefore, there is necessity for affordable, rapid, and simple approaches. Electrochemical biosensors have shown great promise for rapid food- and water-borne pathogen detection. Over the last decade, various attempts have been made to develop techniques for the rapid quantification of E. coli O157:H7. This review covers the importance of E. coli O157:H7 and recent progress (from 2015 to 2020) in the development of the sensitivity and selectivity of electrochemical sensors developed for E. coli O157:H7 using different nanomaterials, labels, and electrochemical transducers.

Engineering of Complex Order and the Macroscopic Deformation of Liquid Crystal Polymer Networks

2012 ◽  
Vol 124 (50) ◽  
pp. 12637-12640 ◽  
Author(s):  
Laurens T. de Haan ◽  
Carlos Sánchez-Somolinos ◽  
Cees M. W. Bastiaansen ◽  
Albertus P. H. J. Schenning ◽  
Dirk J. Broer
Keyword(s):  
Liquid Crystal ◽  
Polymer Networks ◽  
Liquid Crystal Polymer ◽  
Complex Order ◽  
Crystal Polymer ◽  
Macroscopic Deformation

Mixing the immiscible: blends of dynamic polymer networks

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17514-17518 ◽  
Author(s):  
Roberto Martin ◽  
Alaitz Rekondo ◽  
Alaitz Ruiz de Luzuriaga ◽  
Antxon Santamaria ◽  
Ibon Odriozola
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Immiscible Blends ◽  
Crosslinked Polymer ◽  
Immiscible Polymer ◽  
Superior Mechanical Properties

Is it possible to blend two immiscible polymer networks starting from their cured state? A simple thermomechanical approach permits blending two dynamically crosslinked polymer networks, to give blends with superior mechanical properties.

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