Gypsum Composite Boards Incorporating Phase Change Materials: A Review

2021 ◽  
Vol 21 (4) ◽  
pp. 2269-2277
Author(s):  
Lucian-Cristian Pop ◽  
Mihaela Baibarac ◽  
Ion Anghel ◽  
Lucian Baia
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
Thermal Characteristics ◽  
Carbonaceous Material ◽  
Fatty Acid Esters ◽  
Graphite Nanosheets ◽  
Wide Range ◽  
Acid Esters

The purpose of this review is to provide an overview of the available gypsum based composite including various phase change materials employed to increase the thermal energy storage capacity of building materials. A wide range of materials such as n-alkane, saturated fatty acid, fatty acid esters etc are used as phase change materials. Adding carbonaceous material (carbon nanofibers, activated nanocarbon, graphite nanosheets etc.) to augment some properties is also a common practice. In addition, there are presented the methods of obtaining the nano/macro-composites together with some thermal characteristics of the newly prepared materials.

A series of electrospun fatty acid ester/polyacrylonitrile phase change composite nanofibers as novel form-stable phase change materials for storage and retrieval of thermal energy

2016 ◽  
Vol 87 (19) ◽  
pp. 2314-2322 ◽  
Author(s):  
Huizhen Ke ◽  
Yonggui Li
Keyword(s):  
Fatty Acid ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Fatty Acid Ester ◽  
Composite Nanofibers ◽  
Phase Change Materials ◽  
Fatty Acid Esters ◽  
Storage And Retrieval ◽  
Acid Esters

In this paper, a series of fatty acid esters, including ethyl laurate (EL), butyl stearate (BS), ethyl palmitate (EP), ethyl stearate (ES) and methyl palmitate (MP), were selected as the solid–liquid phase change materials (PCMs), and then embedded inside the porous network structure of polyacrylonitrile (PAN) nanofibers supporting the skeleton by electrospinning technology, respectively. Morphological structures, chemical structures and thermal energy storage properties of electrospun fatty acid ester/PAN composite nanofibers were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy and differential scanning calorimetry (DSC), respectively. Observations by FE-SEM images showed that the PAN nanofibers acting as the supporting polymer matrices can perfectly maintain the fiber shape and effectively prevent the leakage of the molten fatty acid esters. Maximum loaded weight percentages of the EL, BS, EP, ES and MP in the composite solutions could reach up to about 70, 45, 55, 65 and 60 wt.%, respectively. DSC results indicated that the prepared EL/PAN, BS/PAN, EP/PAN, ES/PAN and MP/PAN composite nanofibers had appropriate melting peak temperatures (about 1.26℃, 21.20℃, 29.37℃, 29.66℃ and 31.93℃, respectively) based upon climatic requirement, and the corresponding melting enthalpies were about 84.11, 55.10, 95.37, 93.35 and 110.4 kJ/kg, respectively. It can be considered that electrospun EL/PAN, BS/PAN, EP/PAN, ES/PAN and MP/PAN composite nanofibers would be promising form-stable PCMs for the applications related to the storage and retrieval of thermal energy, such as solar energy storage, building energy conservation, indoor temperature controlling and smart textiles and fibers.

scholarly journals Evolution of the Study of Phase Diagram of Binary and Ternary Mixtures Involving Fatty Acid Esters

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 369
Author(s):  
Gabriel Rubio-Pérez ◽  
Natalia Muñoz-Rujas ◽  
Fernando Aguilar ◽  
Rebecca Ravotti ◽  
Lukas Müller ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Phase Diagrams ◽  
Phase Change Materials ◽  
Ternary Mixtures ◽  
Fatty Acid Esters ◽  
Precise Knowledge ◽  
Pure Compounds ◽  
Available Information ◽  
Acid Esters

Interest in phase change materials keeps on rising as thermal energy storage grows in popularity in the scientific community as a promising complement for renewable energies in the future. Extending the possibilities beyond pure compounds, the use of mixtures (especially eutectics) widens the range of suitable phase change materials (PCM) available in the market. However, a precise knowledge of the mixtures’ phase behavior is required, making phase diagrams the most appropriate tools to follow. The aim of this work is to collect and analyze published literature concerning the phase diagrams of fatty acid esters mixtures, which constitute promising candidates as PCM due to their attractive properties, such as high latent heat, chemical stability and the possibility of extracting them from vegetable and animal oils. The topic appears as a still open scientific field, where further studies need to be performed to complete, complement and perfect the currently available information.

scholarly journals Sequestration of 9-Hydroxystearic Acid in FAHFA (Fatty Acid Esters of Hydroxy Fatty Acids) as a Protective Mechanism for Colon Carcinoma Cells to Avoid Apoptotic Cell Death

Cancers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 524 ◽  
Author(s):  
Juan P. Rodríguez ◽  
Carlos Guijas ◽  
Alma M. Astudillo ◽  
Julio M. Rubio ◽  
María A. Balboa ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Cell Lines ◽  
Hydroxy Fatty Acids ◽  
Fatty Acid Esters ◽  
Protective Mechanism ◽  
Hydroxystearic Acid ◽  
Colorectal Tumors ◽  
Wide Range ◽  
Acid Esters

Hydroxy fatty acids are known to cause cell cycle arrest and apoptosis. The best studied of them, 9-hydroxystearic acid (9-HSA), induces apoptosis in cell lines by acting through mechanisms involving different targets. Using mass spectrometry-based lipidomic approaches, we show in this study that 9-HSA levels in human colorectal tumors are diminished when compared with normal adjacent tissue. Since this decrease could be compatible with an escape mechanism of tumors from 9-HSA-induced apoptosis, we investigated different features of the utilization of this hydroxyfatty acid in colon. We show that in colorectal tumors and related cell lines such as HT-29 and HCT-116, 9-HSA is the only hydroxyfatty acid constituent of branched fatty acid esters of hydroxyfatty acids (FAHFA), a novel family of lipids with anti-inflammatory properties. Importantly, FAHFA levels in tumors are elevated compared with normal tissue and, unlike 9-HSA, they do not induce apoptosis of colorectal cell lines over a wide range of concentrations. Further, the addition of 9-HSA to colon cancer cell lines augments the synthesis of different FAHFA before the cells commit to apoptosis, suggesting that FAHFA formation may function as a buffer system that sequesters the hydroxyacid into an inactive form, thereby restricting apoptosis.

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