采用碳酸钙作为硬模板制备出孔直径为0. 5~5 nm的多孔石墨烯,并以聚二甲基硅氧烷( PDMS)气相沉积改性提高多孔石墨烯的亲油性,接触角为152. 3′. 经熔融浸渍法制备PDMS改性多孔石墨烯/棕榈酸复合相变材料,棕榈酸的吸附量达80. 2%,将石墨烯的多孔结构完全填充均匀. X射线衍射测试相变材料的结晶性质没有变化;差示热扫描热量分析表明,经PDMS改性后的多孔石墨烯复合相变材料在熔融和结晶过程中,相变焓分别为170. 1 kJ·kg-1和167. 8 kJ·kg-1 ,可望应用于余热回收和太阳能贮存等领域.
A porous graphene ( PG) was synthesized using calcium carbonate micro-spheres as a hard template, graphene oxide prepared by the Hummers′method as graphene precursor, hydrazine hydrate as a reduction agent and N,N-dimethylformamide as a dispersion agent. The as-prepared PG was modified by chemical vapor deposition of polydimethylsiloxane ( PDMS) to obtain a su-per hydrophobic porous material (PG-PDMS) with a water contact angle of 152. 3′, which was used as a porous host for palmitic acid. It was found that the pores of the PG-PDMS were completely filled with palmitic acid. The hydrophobic modification signifi-cantly increased the palmitic acid content from 62. 3 to 80. 2%. The incorporation of palmitic acid did not change the crystal struc-ture of the PG and PG-PDMS. The latent heats of melting and crystallization for the palmitic acid-filled PG-PDMS are 167. 8 and 170. 1 kJ·kg1 , respectively. This phase change material has great potential for energy saving applications and solar energy storage.
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