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Advances in Phase Change Materials: Characterization, Design and Applications
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Advances in Phase Change Materials: Characterization, Design and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: 10 June 2024 | Viewed by 1092

Special Issue Editor

Dr. Yunzheng Wang

E-Mail Website
Guest Editor
Center for Optics Research and Engineering (CORE), Shandong University, Qingdao 266237, China
Interests: ultrafast lasers; optical nonlinearity; nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Phase change phenomena exist in many natural materials, such as metals, polymers and oxides, etc. Phase change materials have been widely researched in terms of energy storage, thermal management, smart building, and information storage. Especially in the intelligent photonics fields, various new types of photonic devices have materialized by taking advantage of phase change materials in rapid reversible switching, large variation range of optical dielectric function, and nonvolatile and long-term retention. These devices usually possess reprogrammable, reconfigurable, rewriteable, tunable, and switchable properties.

This volume aims to collect the latest developments for scientific and technological advances of the PCMs so as to provide an exhaustive overview of the state of the art and future trends. Topics will include but not be limited to:

  • Synthesis and doping engineering;
  • Calculation and modeling of transition dynamics;
  • New structures, e.g., super-lattice and heterostructure;
  • Fundamental and device physics;
  • Micro- and nanoscale phase-change devices;
  • Metal-insulator transition in VO2;
  • Phase-change memory;
  • Neuromorphic computing and AI;
  • Thermal management;
  • Photonics application.

Dr. Yunzheng Wang
Guest Editor

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 submissions that pass pre-check are 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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

  • phase change materials
  • synthesis and doping engineering
  • calculation and modeling
  • micro- and nanoscale phase-change devices

Published Papers (2 papers)

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Research

12 pages, 6917 KiB  
Article
Optimization of a Ge2Sb2Te5-Based Electrically Tunable Phase-Change Thermal Emitter for Dynamic Thermal Camouflage
by Yufeng Xiong, Guoxu Zhang, Yaolan Tian, Jun-Lei Wang, Yunzheng Wang, Zhuang Zhuo and Xian Zhao
Materials 2024, 17(7), 1641; https://doi.org/10.3390/ma17071641 - 03 Apr 2024
Viewed by 437
Abstract
Controlling infrared thermal radiations can significantly improve the environmental adaptability of targets and has attracted increasing attention in the field of thermal camouflage. Thermal emitters based on Ge2Sb2Te5 (GST) can flexibly change their radiation energy by controlling the [...] Read more.
Controlling infrared thermal radiations can significantly improve the environmental adaptability of targets and has attracted increasing attention in the field of thermal camouflage. Thermal emitters based on Ge2Sb2Te5 (GST) can flexibly change their radiation energy by controlling the reversible phase transition of GST, which possesses fast switching speed and low power consumption. However, the feasibility of the dynamic regulation of GST emitters lacks experimental and simulation verification. In this paper, we propose an electrically tunable thermal emitter consisting of a metal–insulator–metal plasmonic metasurface based on GST. Both optical and thermal simulations are conducted to optimize the structural parameters of the GST emitter. The results indicate that this emitter possesses large emissivity tunability, wide incident angle, polarization insensitivity, phase-transition feasibility, and dynamic thermal camouflage capability. Therefore, this work proposes a reliable optimization method to design viable GST-based thermal emitters. Moreover, it provides theoretical support for the practical application of phase-change materials in dynamic infrared thermal camouflage technology. Full article
(This article belongs to the Special Issue Advances in Phase Change Materials: Characterization, Design and Applications)
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21 pages, 18109 KiB  
Article
Preparation and Performance Study of n-Undecane Phase Change Cold Storage Material
by Luchao Yan, Yang Wang, Shijian Lu, Zhipeng Zhu and Lingling Xu
Materials 2024, 17(7), 1570; https://doi.org/10.3390/ma17071570 - 29 Mar 2024
Viewed by 418
Abstract
With the fast development of the cold chain transportation industry, the traditional refrigeration method results in significant energy consumption. To address the national call for energy saving and emission reduction, the search for a new type of energy storage material has already become [...] Read more.
With the fast development of the cold chain transportation industry, the traditional refrigeration method results in significant energy consumption. To address the national call for energy saving and emission reduction, the search for a new type of energy storage material has already become a future development trend. According to the national standard GB/T28577 for the classification and basic requirements of cold chain logistics, the temperature in frozen logistics is typically below −18 °C. In this study, n-undecane with a phase change temperature of −26 °C is chosen as the core material of microcapsules. Poly(methyl methacrylate) is applied as the shell material, with n-undecane microcapsules being prepared through suspension polymerization for phase change cold storage materials (MEPCM). Using characterization techniques including SEM, DSC, FTIR, and laser particle size analysis, the effects of three types of emulsifiers (SMA, Tween-80, Tween-80/span-80 (70/30)), SMA emulsifier dosage, core–shell ratio, and emulsification rate on the thermal performance and micro-surface morphology of n-undecane/PMMA microcapsules were studied. The results indicate that when comparing SMA, Tween-80, and Tween-80/span-80 (70/30) as emulsifiers, the dodecane/PMMA microcapsules prepared with SMA emulsifier exhibit superior thermal performance and micro-surface morphology, possessing a complete core–shell structure. The optimal microstructure and the highest enthalpy of phase change, measuring 120.3 kJ/kg, are achieved when SMA is used as the emulsifier with a quantity of 7%, a core-to-wall ratio of 2.5:1, and an emulsification speed of 2000 rpm. After 200 hot and cold cycles, the enthalpy of phase change decreased by only 18.6 kJ/kg, indicating the MEPCM thermal performance and cycle life. In addition, these optimized microcapsules exhibit favorable microstructure, uniform particle size, and efficient energy storage, making them an excellent choice for the refrigeration and freezing sectors. Full article
(This article belongs to the Special Issue Advances in Phase Change Materials: Characterization, Design and Applications)
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