Three-Dimensional Printed Insulation For Dynamic Thermoelectric Harvesters With Encapsulated Phase Change Materials

2017 ◽  
Vol 1 (4) ◽  
pp. 1-4 ◽  
Author(s):  
Michail E. Kiziroglou ◽  
Thomas Becker ◽  
Steven W. Wright ◽  
Eric M. Yeatman ◽  
James W. Evans ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Three Dimensional

High-performance composite phase change materials for energy conversion based on macroscopically three-dimensional structural materials

2019 ◽  
Vol 6 (2) ◽  
pp. 250-273 ◽  
Author(s):  
Jie Yang ◽  
Li-Sheng Tang ◽  
Lu Bai ◽  
Rui-Ying Bao ◽  
Zheng-Ying Liu ◽  
...  
Keyword(s):  
Phase Change ◽  
Energy Conversion ◽  
High Performance ◽  
Phase Change Materials ◽  
Three Dimensional ◽  
Structural Materials ◽  
Shape Stability ◽  
Efficient Energy ◽  
Composite Phase Change Materials ◽  
High Performance Composite

Macroscopically three-dimensional structural materials endow composite phase change materials with enhanced comprehensive performance, including excellent shape stability, high thermal conductivity and efficient energy conversion.

scholarly journals Tunable Duplex Metalens Based on Phase-Change Materials in Communication Range

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 993 ◽  
Author(s):  
Wei Bai ◽  
Ping Yang ◽  
Shuai Wang ◽  
Jie Huang ◽  
Dingbo Chen ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Three Dimensional ◽  
Special Unit ◽  
Compact Size ◽  
Unit Cells ◽  
First Time ◽  
Change Material ◽  
Different Sources

Metalenses recently have attracted attention because of their more compact size in comparison with conventional lenses; they can also achieve better optical performance with higher resolution. Duplexer is an interesting function of a metalens that can distinguish different sources and divide them into two parts for specific purposes. In this article, we design tunable duplex metalenses with phase-change material Ge2Sb2Te5 for the first time. Two types of special unit cells are designed to modulate the incident lights, and four metalenses are designed based on the two types of unit cells. Specific phase profiles are calculated for different sections of metalens in which the corresponding unit cells are settled; accordingly, the metalenses can focus the incident lights at any positions according to our design. Moreover, the metalenses become selectable via tuning the state of phase-change material, which means that the output light field can be actively controlled. The proposal of our tunable duplex metalenses will offer new opportunities for active three-dimensional imaging or optical coding.

scholarly journals Design of hybrid narrow-band plasmonic absorber based on chalcogenide phase change material in the infrared spectrum

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Israel Alves Oliveira ◽  
Igor Leonardo Gomes de Souza ◽  
Vitaly Felix Rodriguez-Esquerre
Keyword(s):  
Phase Change ◽  
Electromagnetic Waves ◽  
Phase Change Materials ◽  
Empirical Relation ◽  
Three Dimensional ◽  
Normal Incidence ◽  
Resonant Absorption ◽  
Nanophotonic Devices ◽  
Intermediate Phases ◽  
Infrared Spectral

AbstractStructures absorbing electromagnetic waves in the infrared spectral region are important optical components in key areas such as biosensors, infrared images, thermal emitters, and special attention is required for reconfigurable devices. We propose a three-dimensional metal-dielectric plasmonic absorber with a layer of PCM’s (Phase Change Materials). The phase shift effects of PCMs are numerically analyzed, and it is possible to obtain a shifting control of the resonant absorption peaks between the amorphous and crystalline states using the Lorentz–Lorenz relation. By using this empirical relation, we analyzed the peak absorption shift at intermediate phases between the amorphous and the crystalline. The geometric parameters of the structure with the PCM layer in the semi-crystalline state were adjusted to exhibit strong absorption for normal incidence. The effects of the oblique incidence on the absorption for the TM and TE polarization modes were also analyzed. Our results demonstrate that PCMs have great potential for reconfigurable nanophotonic devices.

Study on the Preparation and Properties of PEG Phase Change Materials Fixed by Semi-IPN

2011 ◽  
Vol 299-300 ◽  
pp. 654-658
Author(s):  
Hong Zhang ◽  
Xiao Lei Wang ◽  
Qian Qian Wang
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Three Dimensional ◽  
Molar Ratio ◽  
Good Thermal Stability ◽  
Dimensional Network ◽  
Mass Fractions ◽  
Optimum Formula ◽  
Change Material

Semi-IPN phase change material (PCM) which is suitable for the temperature adjustment textile field is prepared by solution copolymerization. The structure of framework material is a three-dimensional network prepared by N-hydroxymethyl acrylamide, and the phase change material is prepared by polyethylene glycol with molecular weigh 2000. The orthogonal experimental method is used for determining the optimum formula and investigating the various factors on the phase change material properties. Structure and properties of the composite properties are synthesized by SEM, DSC, TGA. The result shows: the advanced process of making composite phase change material is that PEG owns 70% of the overall mass fractions, initiator owns 2.5% of monomer mass fractions, the molar ratio of cross-linker monomer is 1:8, the reaction time is 3 hours, and mass ratio of monomer to water is 1:6. The prepared composite material is distributed uniformly of framework holes, and it has a well fixed effect to the phase change material, which the phase transition temperature is 32.92 °C, the enthalpy is up to 108.41 J / g. It also has a good thermal stability, and applies to the spinning environment which the temperature is not higher than 300 °C.

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