石墨烯在水泥净浆中的分散特性

Dispersion characteristics of graphene in cement paste

  • 摘要: 为研究水泥净浆中石墨烯的分散方式和分散程度的评价方法,采用不同阴离子表面活性剂作分散助剂分散石墨烯材料,通过高速物理搅拌与超声分散方法制备石墨烯分散液。采用紫外-可见分光光度法、静置沉降法、电阻率、SEM及能谱测试观测石墨烯在碱性溶液、水泥净浆及其水泥净浆水化硬化产物中的分布方式,分析它们的分散均匀性。结果表明:在水泥基材料碱性环境中,具有耐碱性高亲油基团的分散剂,引入一定程度气泡微珠有助于提高石墨烯的分散均匀性和经时稳定性及削弱石墨烯在水泥净浆中的上浮效应,同时,其断面石墨烯分散均匀性能够提高30%。采用分光光度计法、静置法和电阻法评价石墨烯在碱性溶液中的分散效果,简单有效。

     

    Abstract: In order to evaluate the dispersion method and dispersion degree of graphene in pure cement mud, different anionic surfactants were used as dispersion graphene materials, and graphene dispersion was prepared by high-speed physical mixing and ultrasonic dispersion methods.Their dispersion uniformity was analyzed by UV-visible spectrophotometry, static settlement, resistivity, SEM and energy spectroscopy test to observe the distribution of graphene in alkaline solutions, pure cement mud, and its pure cement mud hydrochemical hardening products.The results show that in the pure cement mud alkaline environment, the introduction of bubble microbeads helps to improve the dispersion uniformity of graphene and the stability for time and weaken the floating effect of graphene in pure cement mud. At the same time, the cross-section graphene dispersion uniformity can be improved by 30%. The dispersion effect of graphene in alkaline solution was evaluated by visible spectrophotometry, static settlement and resistivity, which is simple and effective.

     

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