Interface Characterization of Metals and Metal-nitrides to Phase Change Materials

2011 ◽  
Vol 1337 ◽  
Author(s):  
Deepu Roy ◽  
Dirk J. Gravesteijn ◽  
Rob A. M. Wolters
Keyword(s):  
Contact Resistance ◽  
Phase Change ◽  
Phase Change Materials ◽  
Electrode Materials ◽  
Interfacial Contact ◽  
Interfacial Contact Resistance ◽  
Change Material ◽  
Change Memory ◽  
Selection Of

ABSTRACTWe have investigated the interfacial contact properties of the CMOS compatible electrode materials W, TiW, Ta, TaN and TiN to doped-Sb2Te phase change material (PCM). This interface is characterized both in the amorphous and in the crystalline state of the doped-Sb2Te. The electrical nature of the interface is characterized by contact resistance measurements and is expressed in terms of specific interfacial contact resistance (ρC). These measurements are performed on four-terminal Kelvin Resistor test structures. Knowledge of the ρC is useful for selection of the electrode in the integration and optimization of the phase change memory cells.

scholarly journals Experimental Characterization of Phase Change Materials for Refrigeration Processes

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3033
Author(s):  
Anastasia Stamatiou ◽  
Lukas Müller ◽  
Roger Zimmermann ◽  
Jamie Hillis ◽  
David Oliver ◽  
...  
Keyword(s):  
Energy Density ◽  
Phase Change ◽  
Thermophysical Properties ◽  
Phase Change Materials ◽  
Cost Effective ◽  
Latent Heat Storage ◽  
Lower Energy Density ◽  
Change Material ◽  
Storage Units

Latent heat storage units for refrigeration processes are promising as alternatives to water/glycol-based storage due to their significantly higher energy densities, which would lead to more compact and potentially more cost-effective storages. In this study, important thermophysical properties of five phase change material (PCM) candidates are determined in the temperature range between −22 and −35 °C and their compatibility with relevant metals and polymers is investigated. The goal is to complement existing scattered information in literature and to apply a consistent testing methodology to all PCMs, to enable a more reliable comparison between them. More specifically, the enthalpy of fusion, melting point, density, compatibility with aluminum, copper, polyethylene (PE), polypropylene (PP), neoprene and butyl rubber, are experimentally determined for 1-heptanol, n-decane, propionic acid, NaCl/water mixtures, and Al(NO3)3/water mixtures. The results of the investigations reveal individual strengths and weaknesses of the five candidates. Further, 23.3 wt.% NaCl in water stands out for its very high volumetric energy density and n-decane follows with a lower energy density but better compatibility with surrounding materials and supercooling performance. The importance of using consistent methodologies to determine thermophysical properties when the goal is to compare PCM performance is highlighted.

scholarly journals Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 15625-15631 ◽  
Author(s):  
Yan Chen ◽  
Xiongjie Zhang ◽  
Beifu Wang ◽  
Mengjiao Lv ◽  
Yingying Zhu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Stearic Acid ◽  
Phase Change ◽  
Silica Nanoparticles ◽  
Tannic Acid ◽  
Phase Change Materials ◽  
Mesoporous Silica Nanoparticles ◽  
Composite Phase Change Materials ◽  
Change Material

A novel shape-stabilized phase change material, prepared by immobilizing stearic acid onto tannic-acid-templated mesoporous silica nanoparticles.

A Study on the Development of Phase Change Material Wall

2011 ◽  
Vol 347-353 ◽  
pp. 2773-2776
Author(s):  
Quan Ying Yan ◽  
Li Li Jin ◽  
Lin Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Materials Used ◽  
Change Material ◽  
Selection Of

In this paper, the types, properties and selection of phase-change materials used in the wall were evaluated. The feasibility and methods to add phase change materials into the wall were discussed. The application and development situation of the phase change material wall in the practice were elaborated. Some problems to be solved are pointed out.

Thermoelectric Characterization of Ge2Sb2Te5 Films for Phase-Change Memory

2012 ◽  
Author(s):  
Jaeho Lee ◽  
Takashi Kodama ◽  
Yoonjin Won ◽  
Mehdi Asheghi ◽  
Kenneth E. Goodson
Keyword(s):  
Seebeck Coefficient ◽  
Phase Change ◽  
Thermoelectric Properties ◽  
Phase Change Materials ◽  
Phase Change Memory ◽  
Film Structure ◽  
Thermoelectric Effects ◽  
Crystallization Effect ◽  
Change Memory

While thermoelectric effects can strongly influence the performance of phase-change memory (PCM), the thermoelectric properties of phase-change materials for thin film structure have received little attention. This work reports the temperature and phase dependent Seebeck coefficient of 25 nm and 125 nm thick Ge2Sb2Te5 (GST) films. The Seebeck coefficient of crystalline GST films varies strongly with film thickness, due to changes in crystallization effect and grain boundary scattering. Electrothermal simulations demonstrate that the measured thermoelectric properties can strongly influence the temperature distribution and figures of merit for PCM devices. These data will facilitate cell optimization of novel phase-change memories.

Characterization Phase Change Materials (PCM) Using T-History Method

2016 ◽  
Author(s):  
Navin Kumar ◽  
Debjyoti Banerjee
Keyword(s):  
Phase Change ◽  
Experimental Validation ◽  
Phase Change Materials ◽  
Reference Sample ◽  
Cost Effective ◽  
Experimental Protocol ◽  
Scanning Calorimetry ◽  
Numerical Predictions ◽  
Change Material

“T-history method” is widely used for characterization of thermal properties of Phase Change Material (PCM). In this study improvements are proposed to the experimental protocol used in the conventional T-History method. Experimental validation of numerical predictions for various samples of PCM were performed using the proposed measurement technique. This enabled the evaluation of the improvements in the proposed approach as well as for analyzing the experimental results. This involved measurement of temperature at the surface and in the center of the PCM samples (as well as that of the reference sample materials). The proposed modifications enable enhanced accuracy for estimation of the material properties (when compared to the conventional approaches). The estimates from the proposed approach were observed to be within 10% of the measured values obtained using Differential Scanning Calorimetry (DSC). The proposed approach is amenable to testing large sample sizes, is simpler to implement, provides more rapid data collection and is more cost-effective than that obtained using standard DSC protocols.

Phase Change Materials: A Prospective Solution for Surface Layers of Building Envelopes

2015 ◽  
Vol 749 ◽  
pp. 415-419
Author(s):  
Zbyšek Pavlík ◽  
Anton Trník ◽  
Milena Pavlíková ◽  
Jan Fořt ◽  
Robert Černý
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Phase Changes ◽  
Surface Layers ◽  
Scanning Calorimetry ◽  
Powder Density ◽  
The Difference ◽  
And Storage ◽  
Change Material

A Phase Change Material (PCM) based on paraffinic wax encapsulated in polymer shell is used for improvement of the heat storage capacity of commercially produced dry plaster, originally developed for both exterior and interior hand application. The composition of PCM modified plasters is designed with respect to the workability of fresh mixtures. Characterization of applied PCM is done using the measurement of particle size distribution, powder density, and matrix density. For the newly developed composite plasters, basic physical properties, mechanical properties, and thermal properties are accessed, whereas a specific attention is paid to the Difference Scanning Calorimetry (DSC) analysis. Using DSC measurement, temperatures of phase change transitions and phase changes enthalpies are identified. The obtained results show that the temperature induced phase change can be used for the release and storage of thermal energy in buildings, which can be beneficially utilized for saving the energy spent for the achievement of the indoor thermal comfort.

A New Solar Receiver Thermal Store for Space-Based Activities Using Multiple Composite Phase-Change Materials

1995 ◽  
Vol 117 (3) ◽  
pp. 215-220 ◽  
Author(s):  
Zhen-Xiang Gong ◽  
A. S. Mujumdar
Keyword(s):  
Phase Change ◽  
Single Phase ◽  
Phase Change Materials ◽  
Element Model ◽  
Outlet Temperature ◽  
Composite Phase Change Materials ◽  
Composite Configuration ◽  
Solar Receiver ◽  
Change Material ◽  
Selection Of

A new solar receiver latent thermal energy storage module for space-based activities is proposed. It is different from a conventional module (which uses a single phase-change material (PCM)); this module uses a composite configuration of multiple PCMs. A finite element model is presented which simulates the transient cyclic thermal process involved. Computations have been carried out to investigate the potential advantages of a composite multi-PCM store over a single PCM store. Numerical results indicate that variation of the fluid outlet temperature can be significantly reduced by appropriate selection of multiple composite PCMs.

scholarly journals Selection of the Appropriate Phase Change Material for Two Innovative Compact Energy Storage Systems in Residential Buildings

2020 ◽  
Vol 10 (6) ◽  
pp. 2116 ◽  
Author(s):  
Gabriel Zsembinszki ◽  
Angel G. Fernández ◽  
Luisa F. Cabeza
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Storage Systems ◽  
Residential Buildings ◽  
Hot Water ◽  
Energy Storage Systems ◽  
Change Material ◽  
Selection Of

The implementation of thermal energy storage systems using phase change materials to support the integration of renewable energies is a key element that allows reducing the energy consumption in buildings by increasing self-consumption and system efficiency. The selection of the most suitable phase change material is an important part of the successful implementation of the thermal energy storage system. The aim of this paper is to present the methodology used to assess the suitability of potential phase change materials to be used in two innovative energy storage systems, one of them being mainly intended to provide cooling, while the other provides heating and domestic hot water to residential buildings. The selection methodology relies on a qualitative decision matrix, which uses some common features of phase change materials to assign an overall score to each material that should allow comparing the different options. Experimental characterization of the best candidates was also performed to help in making a final decision. The results indicate some of the most suitable candidates for both systems, with RT4 being the most promising commercial phase change material for the system designed to provide cooling, while for the system designed to provide heating and domestic hot water, the most promising candidate is RT64HC, another commercial product.

Characterization of In20Ge15Sb10Te55Phase Change Material for Phase Change Memory with Low Power Operation and Good Data Retention

2012 ◽  
Vol 51 (3R) ◽  
pp. 031201
Author(s):  
Takahiro Morikawa ◽  
Kenzo Kurotsuchi ◽  
Yoshihisa Fujisaki ◽  
Yuichi Matsui ◽  
Norikatsu Takaura
Keyword(s):  
Low Power ◽  
Phase Change ◽  
Phase Change Memory ◽  
Data Retention ◽  
Good Data ◽  
Power Operation ◽  
Change Material ◽  
Change Memory
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