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Multifunctional HDPE/CNTs/PW composite phase change materials with excellent thermal and electrical conductivities

Journal of Materials Science & Technology 2021年第27期86卷 171-179页

作者： Xiaolong Li Xinxin Sheng Yongqiang Guo Xiang Lu Hao Wu Ying Chen Li Zhang Junwei Gu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science&TechnologyWuhan430074China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science&TechnologyWuhan430074China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China

The risk of leakage and low thermal conductivity severely hinder the wide application of phase change materials(PCMs).In this work,the high-density polyethylene/carbon nanotubes(HDPE/CNTs)porous scaffolds were successfully fabricated via a sacrificial template method followed by the general melt blending and water solvent ***,a series of paraffin wax HDPE/CNTs/PW composite PCMs were obtained combined with the simple vacuum impregnation *** obtained HDPE/CNTs porous scaffolds can effectively avoid the leakage of PW,meanwhile,the thermal conductivity and electrical conductivity of HDPE/CNTs/PW-3:7 are increased by 2.94 times and 13 orders of magnitude compared with the HDPE/PW-3:7 respectively,also,it exhibits high phase change enthalpy(153.95 J/g for melting enthalpy and 152.82 J/g for crystallization enthalpy).From the above perspectives,the HDPE/CNTs/PW-3:7 has promising potential value in the application of light-to-thermal conversion,electro-to-thermal conversion and thermal energy storage.

关键词： paraffin wax HDPE/CNTs porous scaffolds Phase change materials Thermal energy storage

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Optimization of moderator assembly for neutron flux measurement:experimental and theoretical approaches

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Nuclear Science and Techniques 2017年第5期28卷 7-12页

作者： Abdul Waheed Nawab Ali Muzahir A.Baloch Aziz A.Qureshi Eid A.Munem Muhammad Usman Rajput Tauseef Jamal Wazir Muhammad Radiation Physics Laboratory Physics DepartmentCOMSATS Institute of Information Technology(CIIT)

A moderator of paraffin wax assembly has been demonstrated where its thickness can be optimized to thermalize fast neutrons. The assembly is used for measuring fast neutron flux of a neutron probe at different neutron energies, using BF03(U10and 200) and3He(U0.500)neutron detectors. The paraffin wax thickness was optimized at 6 cm for the neutron probe which contains an Am–Be neutron source. The experimental data are compared with Monte Carlo simulation results using MCNP5 version 1.4. Neutron flux comparison and neutron activation techniques are used for measuring neutron flux of the neutron probe to validate the optimum paraffin moderator thickness in the assembly. The neutron fluxes are measured at(1.17 ± 0.09) 9 105 and(1.19 ± 0.1) 9 105n/s, being in agreement with the simulated values. The moderator assembly can easily be utilized for essential requirements of neutron flux measurements.

关键词： Am–Be and 252Cf neutron sources BF3&3He detectors paraffin wax Neutron flux Monte Carlo simulation

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Water Repellency of Cellulosic Fibrous Mats Impregnated with Organic Solutions Based on Recycled Polystyrene

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Journal of Renewable Materials 2021年第1期9卷 85-96页

作者： Dafni Foti Costas Passialis Elias Voulgaridis Stergios Adamopoulos Department of Forestry and Natural Environment Laboratory of Forest UtilizationAristotle University of ThessalonikiThessalonikiGreece Department of Forestry and Wood Technology Linnaeus UniversityVäxjoSweden

Recycled polystyrene in combination with paraffin wax,alkyd resin,and gum rosin were used as components in formulations to investigate their water repellency when applied to cellulosic filter paper *** was used in concentration of 5,10,15 and 20%,alkyd resin and gum rosin of 5%each and paraffin wax of 0.5%.Totally,twenty four water repellent solutions were *** repellency was evaluated in terms of water absorption of the cellulosic fibrous *** relations between retention of solid substances of the formulations and grammage and water absorption of filter paper samples were also *** results showed that all the water repellent formulations exhibited a degree of water *** absorption decreased by increasing the polystyrene concentration in the solution and polystyrene retention by the impregnated filter paper *** incorporation of 0.5%paraffin wax improved the hydrophobicity of treated *** best of the three water repellent formulations including paraffin wax was found to be the“polystyrene+gum rosin+paraffin wax”solution followed by the“polystyrene+alkyd resin+paraffin wax”and“polystyrene+paraffin wax”*** inclusion of 5%gum rosin in polystyrene solutions compared to that of 0.5%paraffin wax was found more effective in almost all cases.

关键词： Water repellents polystyrene gum rosin alkyd resin paraffin wax water absorption

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