Heat and Light at the Nanoscale: Fundamentals and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 5661

Special Issue Editor


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Guest Editor
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
Interests: nanoscale photonics; thermal radiation; energy conversion; nano devices

Special Issue Information

Dear Colleagues,

In recent years, there have been great advances in controlling heat and light using micro- and nanostructures both related to fundamentals and in applications. The strong light–matter interaction at the nanoscale provides versatile ways for tailoring heat and light, with applications ranging from energy conversion, thermal management, communication, and to sensing. Novel control of thermal radiation has been achieved using innovative materials and mechanisms, such as meta-surfaces, 2D materials, quantum materials, epsilon-near-zero (ENZ) materials, phase-change materials, and topological effects as well as machine learning. Numerous breakthroughs have also occurred in the field of near-field radiative heat transfer. There is significant interest in exploring the cold outer space as a thermodynamic resource through radiative cooling. The marriage of optoelectronic devices and nanophotonics points to emerging thermodynamic machines such as thermophotovoltaics and photonic refrigeration. Developing nonreciprocal emitters points to a fundamental pathway for improving energy conversion processes. Accordingly, this Special Issue seeks to showcase research papers, communications, and review articles that focus on (1) novel materials, structures, mechanisms for emitting, guiding, focusing, absorbing, and detecting heat and light; and (2) new developments of applying thermal radiation and radiative heat transfer in energy conversion, thermal management, communication, and sensing.

I look forward to receiving your submissions!

Dr. Linxiao Zhu
Guest Editor

Manuscript Submission Information

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Keywords

  • emitters and absorbers with quantum materials, 2D materials, meta-surfaces, ENZ materials, phase-change materials, topological effects etc.
  • near-field radiative heat transfer
  • nonreciprocal emitters and absorbers: magnetization, time-modulation, nonlinearity
  • radiative cooling
  • cooling textiles
  • thermophotovoltaics
  • electroluminescent cooling
  • thermophotonics
  • solar absorbers
  • thermal diode
  • thermal switch
  • thermal transistor
  • machine learning for thermal emitter and radiative heat transfer

Published Papers (2 papers)

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Research

15 pages, 3248 KiB  
Article
Boosting Evaporative Cooling Performance with Microporous Aerogel
by Huajie Tang, Chenyue Guo, Qihao Xu and Dongliang Zhao
Micromachines 2023, 14(1), 219; https://doi.org/10.3390/mi14010219 - 15 Jan 2023
Cited by 6 | Viewed by 2726
Abstract
Hydrogel-based evaporative cooling with a low carbon footprint is regarded as a promising technology for thermal regulation. Yet, the efficiency of hydrogel regeneration at night generally mismatches with vapor evaporation during the day, resulting in a limited cooling time span, especially in arid [...] Read more.
Hydrogel-based evaporative cooling with a low carbon footprint is regarded as a promising technology for thermal regulation. Yet, the efficiency of hydrogel regeneration at night generally mismatches with vapor evaporation during the day, resulting in a limited cooling time span, especially in arid regions. In this work, we propose an efficient approach to improve hydrogel cooling performance, especially the cooling time span, with a bilayer structure, which comprises a bottom hydrogel layer and an upper aerogel layer. The microporous aerogel layer can reduce the saturation vapor density at the hydrogel surface by employing daytime radiative cooling, together with increased convective heat transfer resistance by thermal insulation, thus boosting the duration of evaporative cooling. Specifically, the microstructure of porous aerogel for efficient radiative cooling and vapor transfer is synergistically optimized with a cooling performance model. Results reveal that the proposed structure with a 2-mm-thick SiO2 aerogel can reduce the temperature by 1.4 °C, meanwhile extending the evaporative cooling time span by 11 times compared to a single hydrogel layer. Full article
(This article belongs to the Special Issue Heat and Light at the Nanoscale: Fundamentals and Applications)
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12 pages, 1061 KiB  
Article
Structure Design of Polymer-Based Films for Passive Daytime Radiative Cooling
by Mu Du, Maoquan Huang, Xiyu Yu, Xingjie Ren and Qie Sun
Micromachines 2022, 13(12), 2137; https://doi.org/10.3390/mi13122137 - 02 Dec 2022
Cited by 5 | Viewed by 2229
Abstract
Passive daytime radiative cooling (PDRC), a cooling method that needs no additional energy, has become increasingly popular in recent years. The combination of disordered media and polymeric photonics will hopefully lead to the large-scale fabrication of high-performance PDRC devices. This work aims to [...] Read more.
Passive daytime radiative cooling (PDRC), a cooling method that needs no additional energy, has become increasingly popular in recent years. The combination of disordered media and polymeric photonics will hopefully lead to the large-scale fabrication of high-performance PDRC devices. This work aims to study two typical PDRC structures, the randomly distributed silica particle (RDSP) structure and the porous structure, and systematically investigates the effects of structural parameters (diameter D, volume fraction fv, and thickness t) on the radiative properties of the common plastic materials. Through the assistance of the metal-reflective layer, the daytime cooling power Pnet of the RDSP structures is slightly higher than that of the porous structures. Without the metal-reflective layer, the porous PC films can still achieve good PDRC performance with Pnet of 86 W/m2. Furthermore, the effective thermal conductivity of different structures was evaluated. The single-layer porous structure with optimally designed architecture can achieve both good optical and insulating performance, and it is the structure with the most potential in PDRC applications. The results can provide guidelines for designing high-performance radiative cooling films. Full article
(This article belongs to the Special Issue Heat and Light at the Nanoscale: Fundamentals and Applications)
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