RADIATION PHYSICS AND CHEMISTRY
·
2018
·
IF 1.435
Pei Dai,Anren Cheng,Xuena Zhao,Yang Jiao,Yongjun Lu,Liancai Wang,Xinmiao Zeng
This article focused on the effect of radiation vulcanization on the mechanical properties and the aging resistance performance in hot oil of the hydrogenated nitrile butadiene rubber (HNBR). The effect of absorbed dose on micromorphology, mechanical properties and thermal stability of radiation vulcanized HNBR (RV-HNBR) was investigated. The fractured surface of the HNBR systems was inspected in scanning electron microscope (SEM). SEM investigation showed that the cross-linked structure was more complete by the γ-ray radiation than heat vulcanization. A study of the compression permanent set property and tensile property of γ-ray radiation vulcanized HNBR was presented. Compared with heat vulcanized HNBR (HV-HNBR), RV-HNBR exhibited outstanding compression recovery performance after immersed in IRM 903 oil at 150 °C for 24 h. The compression-resilience property and the dimensional stability were improved with the absorbed dose increasing. When the absorbed dose was 250 kGy, the compression permanent was 40.1%. The good resistance to hot oil bring radiation vulcanized HNBR to meet many of the most stringent sealing application requirements.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
Yuan-Xian Zeng,Xiu-Wen Zhong,Zhao-Qing Liu,Shuang Chen,Nan Li
The lipophilic MoS2 nanoparticles are synthesized by surface modification with stearic acid (SA). The heat transfer oil-based nanofluids, with the mass fraction of lipophilic nanoparticles varying from 0.25% up to 1.0%, are prepared and their thermal conductivity is determined at temperatures ranging from 40 to 200°C using an apparatus based on the laser flash method. It has been found that the nanofluids have higher thermal conductivity and the thermal conductivity enhancement increased not only with increasing mass fraction of nanoparticles, but also with increasing temperature in the range 40–180°C The results show a 38.7% enhancement of the thermal conductivity of MoS2 nanofluid with only 1.0% mass fraction at 180°C.
研究领域:
材料科学
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热力学
·
化学工程
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 12
·2000550
·
IF 3.404
Jun Li,Longjian Li,Huichang Wang,Xiaoyun Zhu,Ying Chen,Lisi Jia
Herein, a water-limited sol–gel method is applied to fabricate microencapsulated phase change materials (MEPCMs) which have a sodium nitrate (NaNO 3 ) core and a titanium dioxide (TiO 2 ) shell. The MEPCM has a high melting temperature of 306.5 °C and a solidification temperature of 296.7 °C, which shows a potential usage as a high-temperature compatible thermal storage medium for industrial waste heat recovery and concentrated solar power (CSP). The MEPCM is demonstrated to be thermally stable for 200 thermal cycles with a high latent heat of 135.3 J g −1 . The high-temperature latent functional thermal fluid (HT-LFTF) is prepared by dispersing the NaNO 3 @TiO 2 MEPCMs into thermal oil. The test results show that MEPCMs provide an 18.4% effective thermal conductivity enhancement and 131.7% effective specific heat enhancement compared with base thermal oil. The rheological test indicates that the MEPCMs added in the thermal oil enhance the viscosity of the suspension and it increases with the MEPCM concentration. This work provides a new type of thermal oil–based functional thermal fluid containing high-temperature MEPCM and paves the way for the application of LFTF in high-temperature heat storage and transfer.
研究领域:
材料科学
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热能工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Jingyi Zhang,Lei Shu,Chao Chang,Xiaoxiang Li,Ruiming Lin,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Direct absorption of sunlight with carbon nanofluids is a facile way to efficiently harvest solar-thermal energy, but poor dispersion stability of nanofluids under elevated temperatures severely limits their applications. Herein, we report a general strategy to prepare stably-dispersed medium-temperature solar-thermal nanofluids by employing crumpled particles of ethanol-wetted graphene oxide sheets as the self-dispersible photothermal converters. The crumpled particles simultaneously possess intensively-deformed surface structure, a low density and a small particle size. Such features weaken the inter-particle van der Waals attraction and gravitational sedimentation of the crumpled particles, thereby enabling their long-term stable dispersion within commercial thermal storage oils. Uniform dispersion of nanofluids was maintained after continuous heating for 2 weeks under a heating temperature up to 200 °C. The homogenously dispersed nanofluids also achieved high solar absorptance with low particle loadings, and retained the large heat capacity and suitable viscosity. These combined advantageous thermophysical properties enabled consistent high-performance medium-temperature direct absorption-based nanofluidic solar-thermal energy harvesting under large-flux solar illumination.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Haoyuan Tian,Jingpeng Lin,Jiurong Liu,Lei Li,Bin Li,Sinan Zheng,Wei Liu,Chang Liu,Zhihui Zeng,Na Wu
The high-efficiency utilization of two-dimensional (2D) graphene layers for developing durable multifunctional electromagnetic wave (EMW) absorbing aerogels is highly demanded yet remains challenging. Here, renewable, low-density, high-strength, and large-aspect-ratio ceramic silicon dioxide (SiO2) nanofibers were efficiently prepared to assist in the preparation of ultralight yet robust, highly elastic, and hydrophobic graphene aerogels using facile, scalable freeze-drying followed by a carbonization approach. The ceramic nanofibers efficiently prevent the agglomeration of graphene and enhance interfacial interactions, significantly promoting mechanical strength. In addition to the high conduction loss capability derived from the interconnected graphene network, high interfacial polarization derived by abundant heterogeneous interfaces is accomplished for the three-dimensional (3D) hybrid aerogels. The hybrid aerogels thus showcase excellent EMW absorption performance, involving a minimum reflection loss of −74.5 dB at 1.8 mm and an effective absorption bandwidth of 5.7 GHz, comparable to those of the best EMW absorbers. Furthermore, the integration of one-dimensional SiO2 and 2D graphene into 3D hybrid aerogels enables remarkable photothermal antibacterial, photothermal oil absorption, and thermal insulation performances. This work thus provides a type of ultralight ceramic/graphene aerogel with a high-efficiency utilization of graphene for accomplishing high-performance multifunctional applications.
研究领域:
材料科学
·
纳米技术
·
电磁工程
·
复合材料
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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