SrTiO3 as a new solar reflective pigment on the cooling property of PMMA-ceramic composites

Mao, Zepeng; Yang, Zhangbin; Jun, Zhang

doi:10.1016/j.ceramint.2019.05.124

Cited by 35 publications

(9 citation statements)

References 45 publications

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“…The first weight loss from 60°C to 150°C is due to the vaporization of water absorbed physically on the surface of BT nanoparticles. [ 45,46 ] The second weight loss from 150°C to 440°C is attributed to the loss of surface organic molecules and hydroxyl dehydration, producing the gases like CO 2 and water vapor. [ 47,48 ] For BT‐Si747, the first weight loss from 60°C to 150°C is reduced compared with BT because the Si747 modification reduces the amount of adsorbed water.…”

Section: Resultsmentioning

confidence: 99%

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Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

et al. 2020

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In this paper, ternary silicone dielectric elastomer micro‐nanocomposites were prepared by mixing barium titanate (BT) nanoparticles or 3‐mercaptopropylethoxy‐bis(tridecyl‐pentaethoxy‐siloxane) (Si747)‐modified BT (BT‐Si747) with hexagonal boron nitride (BN) microplatelets into methyl vinyl silicone rubber (MVSR). BN platelets as physical barriers improve the dispersion of BT nanoparticles, so the MVSR/BT/BN composites achieve the higher electric breakdown field. The Si747 in MVSR/BT‐Si747/BN composites can be grafted on BT nanoparticles surface while the mercapto groups of Si747 can react with double bonds of MVSR, which increases interfacial interaction to improve the mechanical property. As a result, the tensile strength and elongation at break of MVSR/30 wt%BT‐Si747/30 wt%BN composite are 3.43 MPa and 2705%, which is 2.4 and 4.4 times as high as the MVSR/30 wt%BT/30 wt%BN composite, respectively. The MVSR/BT‐Si747/BN composites exhibit higher actuation performance under lower electric fields due to simultaneous increase in dielectric constant and decrease in elastic modulus. The MVSR/10 wt%BT‐Si747/10 wt%BN composite obtains an actuated strain of 8.81% at 47.48 kV/mm, which is twice as high as pure MVSR (4.4% at 60.21 kV/mm). The used method in this experiment is simple, effective, and low cost, and prepared ternary micro‐nanocomposites have potential applications in dielectric actuators.

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Section: Resultsmentioning

confidence: 99%

“…The second weight loss from 150°C to 440°C is ascribed to decomposition of Si747 and BT. [ 36,37,45 ] The mass residues of BT and BT‐Si747 nanoparticles are 98.1% and 93.7% at 800°C, respectively, indicating that the Si747 content of 4.4% on BT surface.…”

Section: Resultsmentioning

confidence: 99%

Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

et al. 2020

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“…This is because the reflectance of PVC/CaCO 3 composite films is increased and its transmittance changes slightly with the volume fraction of CaCO 3 increasing. [14] In the case of constant throughput, according to Kirchhoff's law, the higher the reflectivity, the lower the absorptivity, and therefore the lower the emissivity. [41,42] When the volume fraction of CaCO 3 increases, the thermal emissivity of PVC/CaCO 3 composite films decreases slightly in the atmospheric window (8-13 μm).…”

Section: Thermal Emissivitymentioning

confidence: 99%

“…[9,10] As a result, TiO 2 has become one of the most widely used fillers to improve solar reflection. [5,11,12] There are many other inorganic particles that can effectively improve the solar reflectivity of polymers, such as antimony trioxide (Sb 2 O 3 ), [7,13] strontium titanate (SrTiO 3 ), [14] barium titanate (BaTiO 3 ), [15] zinc sulfide (ZnS). [16] CaCO 3 is a common inorganic substance and is the most widely used filler for polymer materials such as plastics and rubber.…”

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confidence: 99%

CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites

Tao

Mao

Yang

et al. 2020

Vinyl Additive Technology

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Calcium carbonate (CaCO3) is the most commonly used inorganic filler in polymer materials to improve the mechanical properties and reduce the costs. However, there are few reports on the preparation of cooling materials using CaCO3. In this study, CaCO3 was introduced into the polymer matrix as a solar reflective filler to prepare passive cooling materials. Specifically, the influences of CaCO3 content on the structure and performances of polyvinyl chloride (PVC)/CaCO3 composite films were characterized by scanning electron microscope (SEM), contact angle test, surface roughness and glossiness, solar reflectivity, thermal emissivity, temperature test and mechanical property characterization. When the volume fraction of CaCO3 reaches 67%, the total solar reflectance of PVC/CaCO3 composite films is 80.8%, which is 351.4% higher than that of PVC films. CaCO3 powder has little influence on the thermal emissivity of the atmospheric window (3‐5 μm and 8‐13 μm) of the composite films, which remains at a high level about 0.86. In temperature test, the final temperature of sample 67 v% is only 26.8°C, which is only 2.8°C higher than the room temperature and 22.2°C lower than that of PVC films. For comparison, the cooling performance of PVC/titanium dioxide (TiO2) composite films with 10 v% TiO2 was also measured, and the final temperature is 29.1°C, even 2.3°C higher than that of PVC/CaCO3 composite films with 67 v% CaCO3. In this study, the cost‐effective and solar‐reflective PVC/CaCO3 composites have potential application in cooling material field.

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“…[13] In electronics, SrTiO 3 is also applicable as wide gap semiconductor with a bandgap of 3.2 eV. SrTiO 3 composites are widely investigated as cooling materials, [14] for dielectric capacitors and energy storage applications, [15] or for photocatalytic water splitting for hydrogen production. [16] The dielectric properties of SrTiO 3 in various polymer matrices have been mainly investigated at low frequency.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of polydimethylsiloxane composites filled with SrTiO₃ nanoparticles

et al. 2021

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This article deals with the dielectric properties of polydimethylsiloxane (PDMS) nanocomposites filled with SrTiO3 nanoparticles. The investigations were performed over a very broad range of frequencies (20 Hz to 3 THz). Almost no dielectric dispersion was observed in all the composites at room temperature over the entire range of measurement frequencies, and the dielectric losses were also very low under these conditions (<1.9). The dielectric dispersion was observed at lower temperatures (below 280 K), due to relaxation at the PDMS/SrTiO3 interface and in the bulk polymer. The relaxation time for both cases followed the Vogel–Vulcher law, while the freezing temperature was substantially lower for relaxation at the PDMS/SrTiO3 interface.

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SrTiO3 as a new solar reflective pigment on the cooling property of PMMA-ceramic composites

Cited by 35 publications

References 45 publications

Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites

Dielectric properties of polydimethylsiloxane composites filled with SrTiO₃ nanoparticles

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SrTiO3 as a new solar reflective pigment on the cooling property of PMMA-ceramic composites

Cited by 35 publications

References 45 publications

Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

Ternary silicone dielectric elastomer micro‐nanocomposites with enhanced mechanical and electromechanical properties

CaCO3 as a new member of high solar‐reflective filler on the cooling property in polymer composites

Dielectric properties of polydimethylsiloxane composites filled with SrTiO3 nanoparticles

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Product

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CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites

Dielectric properties of polydimethylsiloxane composites filled with SrTiO₃ nanoparticles