Experimental investigation on heat transfer behavior of the novel ternary eutectic PCM embedded with MWCNT for thermal energy storage systems

Journal of Thermal Analysis and Calorimetry - In this paper, the variation of thermophysical properties such as the thermal conductivity, thermal energy storage capacity, viscosity, and phase...     

Effects of <Emphasis Type="Italic">A.marina</Emphasis>-Derived Isoquercitrin on TNF-Related Apoptosis-Inducing Ligand Receptor (TRAIL-R) Expression and Apoptosis Induction in Cervical Cancer Cells

TNF-related apoptosis-inducing ligand (TRAIL) is an anticancer agent, which has greater apoptosis inducing capacity, but most of the cancer cells become resistant to TRAIL-induced apoptosis. The combined treatment of TRAIL with natural products could restore the cancer cell sensitivity to recombinant human TRAIL (rhTRAIL) protein and might enhance the TNF-related apoptosis-inducing ligand receptor (TRAIL-R) expression. This investigation was aimed to isolate flavonoids from leaves of Avicennia marina and evaluate their potential for sensitization of rhTRAIL in human cervical cancer cells (SiHa). The methanolic extract of A.marina leaves were purified and structure was elucidated as isoquercitrin by NMR and LC-MS analysis. Isolated isoquercitrin showed cytotoxicity against SiHa cell line at IC₅₀ of 980 μM. Messenger RNA (mRNA) expression of TRAIL-Rs was quantified by qRT-PCR, combination of isoquercitrin, and/or rhTRAIL increased TRAIL-R1 and TRAIL-R2 gene expression by 7 folds and 4 folds, respectively. Also, FACS assay revealed that combined treatment has increased the early apoptosis up to 7.24%. In the present study, we found that isoquercitrin enhances the mRNA expression of TRAIL-Rs, but the percentage of apoptosis was meager, possibly due to the influence of other anti-apoptotic proteins.     

Experimental study on the heat transfer and flow properties of Ag–ethylene glycol nanofluid as a coolant

The heat transfer and flow characteristics of silver (Ag) Ethylene glycol (EG) nanofluids, flowing through a tubular heat exchanger were experimentally investigated. The spherically shaped Ag nanoparticles of an average size of 10–65 nm were dispersed in EG in a 0.1–2.0 vol%. The test results reveal that the convective heat transfer coefficient and pressure drop of the Ag–EG nanofluids increased from 39.5 to 49 and 1.42 to 23.7 % respectively, with increased nanoparticles concentration.     

Nanoencapsulation of oleic acid phase change material with Ag2O nanoparticles-based urea formaldehyde shell for building thermal energy storage

Journal of Thermal Analysis and Calorimetry - Nanoencapsulated phase change material (NEPCM) was prepared with oleic acid as phase change material by its encapsulation into Ag2O nanoparticles...     

Thermal energy storage behavior of composite using hybrid nanomaterials as PCM for solar heating systems

In this study, thermal and heat transfer characteristics of the newly prepared composite as phase change material (PCM) comprising paraffin and hybrid nanomaterials (50 % CuO–50 % TiO₂) have been investigated for solar heating systems. Composite PCMs with 0.25, 0.5, 0.75, and 1.0 mass% of hybrid nanomaterials were prepared individually for assessing their better performances than paraffin alone. Sodium dodecylbenzene sulfonate (SDBS) was preferred as the surfactant to ensure the dispersion stability of the nanomaterials in the paraffin and mass fraction of SDBS was 1.2 times of the mass fraction of hybrid nanomaterials in the paraffin. The thermal properties of the composite PCMs were determined by differential scanning calorimetry in terms of mass fractions of hybrid nanomaterials and number of thermal cycles. The thermal stabilities of the paraffin and composite PCMs were tested by thermogravimetric analyzer. The thermal conductivity and viscosity of the paraffin due to the addition of various mass fractions of CuO, TiO₂, and hybrid nanomaterials were determined by LFA 447 NanoFlash analyzer and Brookfield DV-III Ultra programmable rheometer, respectively. The experimental results proved that the heating and cooling rates of composite PCMs were faster due to the dispersion of hybrid nanomaterials. For composite PCM with 1.0 mass% of hybrid nanomaterials, the melting and freezing times were reduced by 29.8 and 27.7 %, respectively, as compared with the paraffin.     

Study on thermal properties of organic ester phase-change material embedded with silver nanoparticles

This study investigates the thermal properties of new silver nano-based organic ester (SNOE) phase-change material (PCM) in terms of latent heat capacity, thermal conductivity and heat storage and release capabilities experimentally. Spherical-shaped surface-functionalized crystalline silver nanoparticles (AgNP) prepared were embedded in mass proportions of 0.1 through 5.0 wt% into the pure (base) PCM. Experimental results reveal that dispersion of AgNP into PCM was effective, only physical and no chemical interaction between AgNP and PCM has been exhibited; thereby phase-change temperature of SNOE PCMs were acceptable. These are essential characteristics for SNOE PCMs which signified their thermal and chemical stability on long term. Test results suggest that while compared to pure PCM, degree of supercooling was reduced by 11.7–6.8 % for aforesaid mass proportions of AgNP, whereas latent heat capacities decreased by 7.88 % in freezing and 8.91 % in melting. The interdependencies between thermophysical properties in improving nucleation and growth rate of stable SNOE PCM crystals were signified and discussed. Thermal conductivity of SNOE PCMs were enhanced from 0.284 to 0.765 W m^?1 K^?1 which was expected to be a 10–67 % increase for the above mass loading of AgNP. Furthermore, for SNOE PCMs enhancement span in freezing and melting cycles was improved by 41 and 45.6 %, respectively. Similarly, cooling and melting times were reduced by 30.8 and 11.3 %, respectively. Embedded AgNP helps to achieve improved thermophysical and heat storage characteristics for SNOE PCMs, which in turn can be considered as a potential candidate for cool thermal energy storage applications.     

Experimental investigation on the heat transfer performance of MHTHS using ethylene glycol-based nanofluids

Journal of Thermal Analysis and Calorimetry - Energy storage plays an important role in improving the applicability of a wide range of energy systems. Buildings could be considered as a desirable...