Preparation and characterization of the properties of polyethylene glycol @ Si 3 N 4 nanowires as phase-change materials

Zhang, Xiaoguang; Liu, Haitao; Yin, Zhaoyu; Wen, Ruilong; Min, Xin; Huang, Yao‐Ting; Fang, Minghao; Wu, Xiaowen

doi:10.1016/j.cej.2016.05.024

Cited by 81 publications

(31 citation statements)

References 42 publications

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“…1 Owing to its excellent physical and chemical properties, silicon carbide (SiC), a typical wide band gap semiconductor, is a very attractive material for the applications in harsh environment, such as high temperature, high power, and high frequency. 2 In particular, SiC has many polymorphs, such as 3C (2.39 eV), 6H (3.02 eV), 4H (3.26 eV), and 2H (3.33 eV).…”

Section: Introductionmentioning

confidence: 99%

Ferrocene‐Catalyzed Growth of Single‐Crystalline 6H‐SiC Nanoribbons

Chu

et al. 2014

J. Am. Ceram. Soc.

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Single crystal 6H-SiC nanoribbons were in situ synthesized in large scale on the as-prepared SiC-Si ceramic substrates via a facile heat-treatment approach using ferrocene as catalyst. The as-synthesized nanoribbons were up to several millimeters long, with widths of 200-300 nm and thicknesses of 20-80 nm. A novel combination growth mechanism of vapor-liquid-solidbased and vapor-solid-tip was proposed for the growth mode of the as-synthesized nanoribbons. This study provided not only a new method for synthesizing SiC nanoribbons but also a new insight into the growth mode for SiC nanoribbons.

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Section: Introductionmentioning

confidence: 99%

Ferrocene‐Catalyzed Growth of Single‐Crystalline 6H‐SiC Nanoribbons

Chu

et al. 2014

J. Am. Ceram. Soc.

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“…8 Polyethylene glycol (PEG), as a sort of organic PCMs, has attracted great interests because of its excellent physical and chemical properties, including appropriate phase transition temperature, large phase transition enthalpy, favorable chemical and thermal stability with no super cooling, or volume change in the phase-change process. [10][11][12] There were a number of materials that were applied to fix organic PCMs, including olive pomace powder, titanium dioxide, and silica molecular sieves. To overcome this defect, shapestabilization supports were introduced to synthesize shape-stabilized PCMs (ss-PCMs) to avoid the leakage of organic PCMs.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this defect, shapestabilization supports were introduced to synthesize shape-stabilized PCMs (ss-PCMs) to avoid the leakage of organic PCMs. [10][11][12] There were a number of materials that were applied to fix organic PCMs, including olive pomace powder, titanium dioxide, and silica molecular sieves. 13 Wang et al utilized expanded graphite as the matrix of caprylic-nonanoic acid to prepare ss-PCM of CA-NA/ EG, which had perfect thermal stability and acceptable latent heat.…”

Section: Introductionmentioning

confidence: 99%

Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

et al. 2019

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Summary Dopamine‐functionalized mesoporous silica (DPMS), which was prepared by using a facile, easy to operate, and environmentally friendly biomimetic method, was synthesized as a new supporter of polyethylene glycol (PEG) to prepare shape‐stabilized phase‐change material (ss‐PCM) of PEG/DPMS with improved enthalpy. The thermal properties of PEG/DPMS were investigated, and the study results demonstrated that dopamine functionalization could regulate the crystallization property of PEG molecules immobilized in PEG/DPMS, and then the enthalpy of PEG/DPMS could be improved effectively. Compared with the ss‐PCM of PEG/SBA‐15 that was synthesized by using unfunctionalized silica molecular sieve (SBA‐15) as the matrix, after dopamine modification, the fusion and solidification enthalpies of 70‐wt% PEG/DPMS increased from 47.25 and 34.96 J/g to 69.77 and 67.54 J/g, respectively. The interaction mechanism study results suggested that the amino groups in the molecule of poly‐dopamines on the surface of DPMS could interact with the oxygen atoms in the molecules of PEG to form hydrogen bonds. Additionally, the PEG/DPMS had favorable thermal reliability and prominent thermal stability. Hence, the DPMS could be applied as a promising supporter for the fabrication of ss‐PCM.

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“…3. A broad band was observed in the range of 800–1100 cm −1 , with two strong absorption peaks at approximately 844 and 883 cm −1 that can be attributed to the Si-N stretching vibration mode of α-Si 3 N 4 based on previous literature3031. In addition, the absorption peaks at 1081 cm −1 and 988 cm −1 showed a blueshift compared with the peaks of bulk α-Si 3 N 4 , which was likely due to size- and/or surface-induced quantum effects632.…”

Section: Resultsmentioning

confidence: 65%

Facile synthesis of silicon nitride nanowires with flexible mechanical properties and with diameters controlled by flow rate

Dong

Zhang

et al. 2017

Sci Rep

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Ultralong Si3N4 nanowires (NWs) were successfully synthesized with size controlled in N2 gas by using an efficient method. The diameters of the Si3N4 NWs increased when the flow rate of N2 gas increased, with average diameters of 290 nm from flow rates of 100 ml/min, 343 nm from flow rates of 200 ml/min and 425 nm from flow rates of 400 ml/min. Young’s modulus was found to rely strongly on the diameters of the Si3N4 NWs, decreasing from approximately 526.0 GPa to 321.9 GPa; as the diameters increased from 360 nm to 960 nm. These findings provide a promising method for tailoring these mechanical properties of the NWs in a controlled manner over a wide range of Young’s modulus values. Vapour-liquid-solid (VLS) mechanisms were used to model the growth of Si3N4 NWs on the inner wall of an alumina crucible and on the surface of the powder mixture. Alumina may be an effective mediator of NW growth that plays an important role in controlling the concentrations of Si-containing reactants to support the growth of NWs on the inner wall of the alumina crucible. This approach offers a valuable means for preparing ultralong Si3N4 NWs doped with Al with unique properties.

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Preparation and characterization of the properties of polyethylene glycol @ Si 3 N 4 nanowires as phase-change materials

Cited by 81 publications

References 42 publications

Ferrocene‐Catalyzed Growth of Single‐Crystalline 6H‐SiC Nanoribbons

Ferrocene‐Catalyzed Growth of Single‐Crystalline 6H‐SiC Nanoribbons

Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

Facile synthesis of silicon nitride nanowires with flexible mechanical properties and with diameters controlled by flow rate

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