Improvement of the thermostability of silicone oil/polystyrene microcapsules by embedding TiO2/Si3N4 nanocomposites as outer shell

Sun, Na; Xiao, Zhenggang

doi:10.1007/s10853-017-1272-6

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…Then, the mixture was dramatically stirred by a shear-force instrument operating at 12 800 rpm for 3 min. During the agitation, modified nano-BN and nano-TiO 2 particles with moderate wettability tend to irreversibly adsorb to the oil–water interfaces due to their high free energy of adsorption . Consequently, a steady oil-in-water (o/w) Pickering emulsion was obtained by using modified nano-BN and nano-TiO 2 particles as Pickering stabilizers.…”

Section: Resultsmentioning

confidence: 99%

“…During the agitation, modified nano-BN and nano-TiO 2 particles with moderate wettability tend to irreversibly adsorb to the oil−water interfaces due to their high free energy of adsorption. 34 Consequently, a steady oil-in-water (o/w) Pickering emulsion was obtained by using modified nano-BN and nano-TiO 2 particles as Pickering stabilizers. Thereafter, the mixture was heated to 80 °C, and the polymerization was initiated inside oil droplet.…”

Section: Synthetic Strategy and Formation Mechanismmentioning

confidence: 99%

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Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Sun

Xiao

2017

Energy Fuels

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Paraffin was encapsulated in a poly(methyl methacrylate) (PMMA)/BN/TiO2 hybrid shell to obtain a novel phase change material (PCM) microcapsule for latent-heat storage. Scanning electron microscope micrographs showed that the resultant composite PCMs exhibited a nearly spherical morphology with a size of 10–20 μm and BN/TiO2 nanoparticles were tightly embedded on the microcapsule surface. The results of thermogravimetric analysis and thermal conductivity test demonstrated that the PMMA/BN/TiO2 composite shell gave the microencapsulated paraffin an excellent thermal performance. Compared to pure paraffin, the thermal conductivity of microcapsules could significantly be enhanced by 117.0%, and the maximum decomposing temperature has an increase of 25.4 °C. The analysis of differential scanning calorimetry and thermal reliability test indicated that the composite PCMs also presented good heat storage capacity and high thermal reliability for latent-heat storage and release. After a heating–cooling cycle test was repeated 100 times, the composite microcapsule still showed a similar phase change performance as before, which can be attributed to the protective effect of PMMA/BN/TiO2 hybrid shell. With increased demands for economical and high-performance renewed energy storage materials, the prepared composite PCMs show great potential applications in thermal energy storage.

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Section: Resultsmentioning

confidence: 99%

Section: Synthetic Strategy and Formation Mechanismmentioning

confidence: 99%

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Sun

Xiao

2017

Energy Fuels

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 From Figure 8, it is clearly observed that abundant powders are well-located on the erosion tube surface. The corresponding EDX spectra shows a series of intensive peaks for Ti (4.51 and 4.93 keV), N (0.34 keV) and Co (0.79 and 6.91 keV) elements which derive from TiO 2 , BN and Co 3 O 4 (produced by the burning of ZIF-67) [25]. Besides, the observed peaks for Fe (0.74, 6.41 and 7.10 keV), Si (1.74 keV), and Ca (3.68 keV) elements are corresponded to the chemical composition of erosion tube and combustion products from propellant matrix.…”

Section: Erosion Properties Of the Modified High Energy Propellantsmentioning

confidence: 99%

Effects of an Organic‐inorganic Nanocomposite Additive on the Combustion and Erosion Performance of High Energy Propellants Containing RDX

Sun

Xiao

2017

Propellants Explo Pyrotec

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A nanocomposite microsphere consisting of solid paraffin, nano-TiO 2 , nano-BN, zeolitic imidazolate framework-67 particles and polymethyl methacrylate was prepared and applied as a functional additive for high energy propellants (with about 23 wt % RDX) to reduce the barrel erosion and improve its combustion performance as well. High energy propellants modified with the nanocomposite were manufactured by a solvent extrusion technique. According to the scanning electron microscope and differential scanning calorimetry results, there exists a good compatibility between the nanocomposite and propellant matrix. The energy and combustion performance as well as erosion of the modified propellants were studied by a closed bomb test and an erosion tube device, respectively.Results showed that compared with the unmodified propellant, both the erosion and energy performance of modified high energy propellant gradually decreased with the increase of nanocomposites contents. When the content of nanocomposites was 5.1 %, the erosion mass of the modified propellant reduced to 37.0 % while the propellant force only decreased 5.7 %, indicating that the nanocomposite has enormous ability to improve gun erosion resistance while barely affect energy performance of propellant. Furthermore, the closed bomb burning curves of the samples showed that addition of nanocomposites to propellant matrix could prolong the combustion time, efficiently inhibit the initial generation rate of combustion gas, and further achieve the progressive burning of the propellants.

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“…Microencapsulated phase change material (MEPCM) using a hard shell encapsulating the PCMs core is endowed with many fascinating virtues, like increasing the heat transfer surface area, protecting the PCMs from environmental reactions, and controlling the volume change during phase transitions. , Various encapsulation methods, including physical, physical–chemical, and chemical processes, have been developed for preparing the MEPCM with different shell materials . However, most of the methods are designed for the organic PCMs as a core, like paraffin wax and n -octadecane. ,, An important drawback is that the working temperature of the reported microencapsulated organic PCMs are universally below 500 °C. ,, …”

Section: Introductionmentioning

confidence: 99%

“…31,35,36 An important drawback is that the working temperature of the reported microencapsulated organic PCMs are universally below 500 °C. 16,33,37 Aluminum and its alloy are kinds of excellent heat storage materials due to their large heat of fusion, high thermal conductivity, and low vapor pressure. 38−41 The melting points of Al alloys (550−1200 °C) are also very suitable for the CPS system.…”

Section: ■ Introductionmentioning

confidence: 99%

Facile Synthesis of Al@Al₂O₃ Microcapsule for High-Temperature Thermal Energy Storage

Zhu

et al. 2018

ACS Sustainable Chem. Eng.

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Preparation of high-temperature encapsulated phase change materials (PCMs) is very challengeable due to the high chemical corrosion of liquid metal and the high thermal stress caused by volume expansion. We herein report a novel strategy for preparing high-temperature Al@Al2O3 PCM. In this method, nano Ni species are loaded on the surface of Al spheres, which could accelerate the oxidation of the surface Al layer during calcination in air. By monitoring the oxygen consumption and the exothermic changes during the oxidation process, it is found that the oxidation of Al follows a stepwise process which results in the formation of a layered Al2O3 shell. The high oxygen consumption and relatively low activation energy (149–156 kJ/mol) suggests that the surface nickel species significantly accelerate the low-temperature (<650 °C) oxidation of aluminum. The Al@Al2O3 composites show a well-formed core–shell structure with 60–68 wt % of core fraction, high latent heat (289–312 J/g), and mitigated supercooling performance. The layered structure of the shell and the presence of voids in the core together strongly improve the elasticity of the core–shell structure by tuning the thermal stress resulting from the volumetric expansion of the Al core during melting, obtaining a very high stability in long-term melting–freezing cycles.

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Improvement of the thermostability of silicone oil/polystyrene microcapsules by embedding TiO2/Si3N4 nanocomposites as outer shell

Cited by 11 publications

References 37 publications

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Effects of an Organic‐inorganic Nanocomposite Additive on the Combustion and Erosion Performance of High Energy Propellants Containing RDX

Facile Synthesis of Al@Al₂O₃ Microcapsule for High-Temperature Thermal Energy Storage

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Improvement of the thermostability of silicone oil/polystyrene microcapsules by embedding TiO2/Si3N4 nanocomposites as outer shell

Cited by 11 publications

References 37 publications

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO2 Hybrid Shell for Thermal Energy Storage

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO2 Hybrid Shell for Thermal Energy Storage

Effects of an Organic‐inorganic Nanocomposite Additive on the Combustion and Erosion Performance of High Energy Propellants Containing RDX

Facile Synthesis of Al@Al2O3 Microcapsule for High-Temperature Thermal Energy Storage

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Product

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Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Synthesis and Performances of Phase Change Materials Microcapsules with a Polymer/BN/TiO₂ Hybrid Shell for Thermal Energy Storage

Facile Synthesis of Al@Al₂O₃ Microcapsule for High-Temperature Thermal Energy Storage