Novel light–driven CF/PEG/SiO2 composite phase change materials with high thermal conductivity

Liu, Zilu; Wei, Huipeng; Tang, Bingtao; Xu, Shimei; Zhang, Shufen

doi:10.1016/j.solmat.2017.09.045

Cited by 130 publications

(38 citation statements)

References 32 publications

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“…In principle, however, the mechanical strength and thermal stability of the polymers can be improved by adding an appropriate filler. Considerable literature has been published on PCM applications that used PEG as the polymer matrix along with different fillers, that is, PEG‐based graphene aerogel (GA), diatomite/carbon nanotubes (CNTs)/PEG composites, and PEG/tetraethyl orthosilicate (TEOS)‐derived‐SiO 2 composites …”

Section: Introductionmentioning

confidence: 99%

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Fauziyah

Hilmi

Zainuri

et al. 2019

J of Applied Polymer Sci

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Polyethylene glycol (PEG)/quartz (denoted as BP/Q) composites have been investigated as candidates of phase change materials (PCMs) due to their thermomechanical properties around the glass transition temperature as well as thermal properties between 30 and 600 C. Quartz (q-SiO 2 ) powders were extracted from local sand in Tanah Laut, Pelaihari, South Kalimantan, Indonesia. The composites were prepared by dispersing q-SiO 2 powders in the PEG matrix followed by the wet mixing process. The thermal properties of the composites were characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), while the thermomechanical properties were examined using a dynamic mechanical analyzer (DMA) in a three-point bending mode around the PEG glass transition temperature range (−100-50 C). The morphology and interface bonding were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From the DSC measurement, the endothermic peak of the composites showed a shift of approximately 7-12 C toward higher temperatures than that of the pure polymer. The melting enthalpy values (ΔH m ) of the BP/Q composites covered the required PCM application range, that is, between 139 and 182 J/g. The TGA of the composites showed that thermal degradation occurs in the range of 250-450 C. We found that solid-solid PCMs (ssPCMs) were successfully fabricated with the addition of 10 and 20 wt% q-SiO 2 . From DMA characterization, the BP/Q 20 wt% composite exhibited the maximum E' and the minimum energy dissipation (E"). Its E' value was approximately 250 MPa more than that of the pure PEG. The glass transition (T g ) temperatures of PEG and BP/Q composites (5, 10, and 20 wt%) were around −24.5, −19.1, −17.1, and − 5.3 C, respectively. In addition, the E" and tan δ values decreased with q-SiO 2 filler content. Furthermore, the Cole-Cole plots of the BP/Q composites revealed a better interfacial bonding between the q-SiO 2 and the PEG matrix in the composites with higher silica content. A compact morphology was shown by the BP/Q 20 wt% composite due to high silica concentration.

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Section: Introductionmentioning

confidence: 99%

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Fauziyah

Hilmi

Zainuri

et al. 2019

J of Applied Polymer Sci

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“…The results depicted that the phase change enthalpy of HPCM reach 124 J/g and thermal conductivity was improved by 12.8% for 3.3 wt.% of Al 2 O 3 as compared to PEC/SiO 2 . Another researcher Liu et al [92] enhanced the thermal conductivity of PEG/SiO 2 composite by introducing carbon fiber (CF) having 1 wt.% to 5 wt.% concentration in it. Figure 8 shows the digital pictures of the CPCM at different temperature.…”

Section: Thermal Energy Storagementioning

confidence: 99%

“…The only sustainable and carbon free energy which is enough to replace fossil fuel is the solar energy. Solar energy is being used wisely due to the immense increase in the fuel prices and shortage of commonly used energy resources [93][94][95][96]. However, the output of this energy is not constant and to make the output definite there is a need to create such materials that can convert light energy into heat energy that can be stored for later use.…”

Section: Solar Energy Storagementioning

confidence: 99%

Thermal applications of hybrid phase change materials: A critical review

2020

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Phase change materials (PCM) with their high latent heat capacity have a great ability to store energy during their phase change process. The PCM are renowned for their applications in solar and thermal energy storage systems for the purpose of heating and cooling. However, one of the major drawbacks of PCM is their low thermal conductivity due to which their charging and discharging time reduces along with the reduction in energy storage capacity. This reduction in the energy storage capacity of PCM can be improved by producing organic-inorganic hybrid form-stable PCM, with the combination of two or more PCM together to increase their energy storage capacity. Nanoparticles that possess high thermal conductivity are also doped with these hybrid PCM (HPCM)to improve the effectiveness of thermal conductivity. This paper presents a short review on the applications of HPCM in energy storage and building application. Apart from this a short section of applications of composite PCM (CPCM) is also reviewed with discussions made at the end of each section. Results from the past literature depicted that the application of these HPCM and CPCM enhanced the energy storage capacity and thermal conductivity of the base PCM and selection of a proper hybrid material plays an essential role in their stability. It is presumed that this study will provide a sagacity, to the readers, to investigate their thermophysical properties and other essential applications.

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“…Thus, an optimal concentration of 0.75 wt.% was found for both friction and wear. Optimal concentrations were also found for other nanolubricants [24,[46][47][48][49][50][51][52][53][54], including those containing h-BN nanoparticles [16,17]. At lower concentrations, the base oil governs the behavior because the quantity of nanoparticles is not sufficient to prevent wear whereas when the concentration is too high, the agglomeration allows the creation of new asperities.…”

Section: Tribological Characterizationmentioning

confidence: 99%

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

et al. 2019

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Dispersions based on hexagonal boron nitride, h-BN, nanoparticles, at 0.50, 0.75 and 1.0 wt.% mass concentrations, in an ester base oil composed mainly of trimethylolpropane trioleate, were investigated as potential nanolubricants. The stability of the dispersions was assessed to determine the reliability of the tribological, thermophysical and rheological measurements. Density and viscosity were measured from 278.15 to 373.15 K, while rheological behavior was analyzed at shear rates from 1 to 1000 s −1 at 283.15 K. Newtonian behavior was exhibited by all nanolubricants at the explored conditions, with the exception of the highest concentration at the lowest shear rates, where possible non-Newtonian behavior was observed. Tribological tests were performed under a normal load of 2.5 N. Wear was evaluated by means of a 3D profiler, scanning electron microscopy and confocal Raman microscopy. The best tribological performance was achieved by the 0.75 wt.% nanolubricant, with reductions of 25% in the friction coefficient, 9% in the scar width, 14% in the scar depth, and 22% of the transversal area, all with respect to the neat oil. It was observed that physical protective tribofilms are created between rubbing surfaces.Coatings 2019, 9, 509 2 of 17 relatively weak van der Waals interactions between loosely stacked h-BN sheets that provide excellent lubrication characteristics [9]. h-BN, the softest and most lubricious polymorph of BN, has both high thermal stability and thermal conductivity as well as numerous industrial applications, especially in metalworking processes where cleanliness of the working environment is required [10][11][12]. Additionally, h-BN is an environmentally-friendly material [13], which is being studied as a nanoadditive for liquid lubricants [14-22] because, compared with solid lubricants, liquid lubricant additives present advantages such as faster entrance and replenishment of the sliding interface, and easier removal of wear debris from the contact zone [23].With respect to the tribological behavior of nanolubricants containing h-BN nanoparticles, Mosleh et al. [14] found that when nanoparticles of h-BN, with irregular flake-like shapes and an average size of 70 nm, were dispersed in commercial sheet metal forming fluids, the friction coefficient for titanium-steel pairs showed little or no improvement; nevertheless, the wear reduction using the 1 wt.% h-BN nanodispersion was 55%. Çelik et al. [15] found that an engine oil (Society of Automotive Engineers (SAE) 10 W) containing h-BN nanoparticles of disk-like shape with an average diameter of 114 nm and thickness of 30-70 nm, led to a 14.4% improvement in the friction coefficient and a 65% decrease in the wear rate with respect to the neat oil for an AISI 4140 steel material. Wan et al. [16] studied nanolubricants composed of a formulated oil 15W-40, a dispersant, and h-BN nanoparticles (disks with average diameter of 120 nm and a single layer thickness of around 30 nm), finding that the nanolubricants with low nanoparticle concentrations s...

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Novel light–driven CF/PEG/SiO2 composite phase change materials with high thermal conductivity

Cited by 130 publications

References 32 publications

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Thermal applications of hybrid phase change materials: A critical review

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

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