Special Issue "Recent Progress in Photoresponsive Azopolymers"

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (1 October 2019).

Special Issue Editors

Dr. Jesús Del Barrio
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Guest Editor
Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Zaragoza, Spain
Interests: photoresponsive materials; supramolecular chemistry; polymer fluids
Dr. Carlos Sánchez-Somolinos
Website
Guest Editor
Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada, Universidad de Zaragoza-CSIC
Interests: responsive materials; advanced manufacturing; laser; inkjet printing; 3D printing; 4D printing; actuators; soft robotics

Special Issue Information

Dear Colleagues,

Azopolymers combine the physico-chemical properties of macromolecular compounds with the light responsivity of azobenzenes. The photoinduced transformations and motions of the photoresponsive groups of azopolymers result in significant alterations of specific material properties. Such changes comprise, but are not limited to, the photoinduction of macroscopic optical anisotropy, variation in optical transmittance, and nanostructuring, and are the basis of a large number of applications in a wide variety of areas including photonics, optical displays, data storage, nanofabrication, soft actuators, and biomaterials. Azopolymers encompass a fascinating area of both fundamental and applied-oriented research, which is unceasingly nurtured with exciting developments and innovative concepts from physicists, chemists, materials scientists, and (bio)engineers.

Authors are invited to submit contributions focused on the synthesis and structure, function, and applications of azopolymers. Suggested themes for this Special Issue include, but are not limited to, the following:

  • Advances in the synthesis of azopolymers (main chain and side chain polymers, dendrimers, block copolymers, as well as polymeric networks)
  • Red-shifted azobenzene derivatives and polymers
  • Photoinduced phase transitions of liquid crystal and amorphous azopolymers
  • Recent trends in photonic applications of azopolymers and their photoalignment
  • Mechanically responsive, azobenzene-containing soft polymeric systems
  • The micellization of azopolymers for encapsulation and controlled release applications

Dr. Jesús Del Barrio
Dr. Carlos Sánchez-Somolinos
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • azopolymer
  • liquid crystal
  • surface patterning
  • optical anisotropy
  • microstructure alignment
  • phase transition
  • soft actuator
  • photoresponsive micelle

Published Papers (2 papers)

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Review

Open AccessReview
Photochemical On–Off Switching of One-Dimensional Photonic Crystals Consisting of Azo-Functionalized Liquid Crystal Polymer and Polyvinyl Alcohol
Crystals 2019, 9(12), 610; https://doi.org/10.3390/cryst9120610 - 21 Nov 2019
Cited by 2
Abstract
One-dimensional (1D) photonic crystals (PCs) are prepared from multi-bilayered films stacked with alternating azo-functionalized liquid crystal polymer (PAz) films and polyvinyl alcohol (PVA) films. Reflection with a wavelength that depends on the thickness of the films is observed, and the reflection can be [...] Read more.
One-dimensional (1D) photonic crystals (PCs) are prepared from multi-bilayered films stacked with alternating azo-functionalized liquid crystal polymer (PAz) films and polyvinyl alcohol (PVA) films. Reflection with a wavelength that depends on the thickness of the films is observed, and the reflection can be turned on and off by switching between the two states, based on whether there is a difference in the refractive index between the two films. The refractive index change of PAz can be photochemically caused by a phase transition, based on the alignment states of the liquid crystal (LC). In this review, we focused on an effective photo-induced on–off switching approach in 1D PCs using LC properties and described the basic optical and chemical principles, the experimental results, and further optimizations. Full article
(This article belongs to the Special Issue Recent Progress in Photoresponsive Azopolymers)
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Open AccessReview
Photomechanical Azobenzene Crystals
Crystals 2019, 9(9), 437; https://doi.org/10.3390/cryst9090437 - 22 Aug 2019
Cited by 12
Abstract
Photomechanically responsive materials are promising candidates for future smart actuator applications. The photo-responsive behaviors originate from the photoisomerization of photochromic molecules. A typical photochromic compound, azobenzene, has been studied extensively in the solution state and has played a crucial role in the photomechanical [...] Read more.
Photomechanically responsive materials are promising candidates for future smart actuator applications. The photo-responsive behaviors originate from the photoisomerization of photochromic molecules. A typical photochromic compound, azobenzene, has been studied extensively in the solution state and has played a crucial role in the photomechanical behaviors of materials such as polymers and gels, via chemical bridging with their matrix. In contrast to polymers and gels, the photomechanical attributes of molecular crystals have not progressed to the same degree, due to their rigidity and fragility. However, the past decade has witnessed an increasing number of reports of the photomechanical motion of molecular crystals, including azobenzene crystals. This paper reviews the current state-of-the-art of mechanically responsive azobenzene crystals, including the history, crystal design strategy, and future promising applications. Full article
(This article belongs to the Special Issue Recent Progress in Photoresponsive Azopolymers)
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