功能化氧化石墨烯的制备及其在硅酸盐水泥中的应用  

Preparation of functionalized graphene oxide and its application in portland cement

作　　者：李波 廖碧海[2] LI Bo;LIAO Bihai(Guangxi Modern Logistics Group Co.,Ltd.,Nanning 530299,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]广西现代物流集团有限公司,广西南宁530299 [2]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《无机盐工业》2023年第6期57-62,共6页Inorganic Chemicals Industry

基　　金：国家自然科学基金(51078164);湖北省自然科学基金(2011CDB291);江西省交通运输厅重点科技项目(2011C0053)。

摘　　要：纳米材料与水泥之间的黏结强度较差,有可能导致增强效果不理想。氧化石墨烯(GO)虽然含有很多氧基官能团,但是在强碱性环境中极度不稳定。用新的功能化方法制备了一种功能化氧化石墨烯(FGO),并将GO和FGO分别掺入水泥净浆制备了水泥复合硬化浆体。采用傅里叶变换红外光谱仪(FT-IR)、X射线光电子能谱仪(XPS)、扫描电镜(SEM)和透射电镜(TEM)分析了纳米材料的黏结性和模拟孔隙溶液稳定性。结果表明,FGO的功能层由(3-氨丙基)三乙氧基硅烷(APTES)和无定形SiO2组成,在强碱性环境中保护GO基面不被还原,并参与水泥水化过程,形成牢固可靠的黏结体。与普通水泥相比,质量分数为0.1%的FGO可使水泥硬化浆体的28d抗折和抗压强度分别提高24.73%和55.28%。FGO在水泥浆料中具有良好的分散性,细化了水泥孔隙结构,最终提高了水泥复合材料的力学性能。Poor bonding strength between nanomaterials and cement composites inevitably lead to the failure of reinforcement.Graphene oxide(GO)possesses large amounts of oxygen functional groups,but shows highly unstable in the strongly alkaline environment.In this study,a novel functionalization method for the fabrication of functionalized GO(FGO)was explored and GO and FGO cement based composites were prepared.Fourier transforminfrared spectroscopy(FT-IR),X-ray photoelectron spectrometer(XPS),scanning electron microscope(SEM)and transmission electron microscope(TEM)were used to analyze the bonding properties and the stability of nanomaterials in simulated pore solution.The results showed that the functionalized layer of FGO were composed of(3-aminopropyl)triethoxysilane(APTES)and amorphous SiO2,which could protect the GO basal plane from reduction in the strongly alkaline environment and participate in the cement hydration process to form strong and reliable bonding.Compared with plain cement,0.1%FGO could increase the 28 d flexural and compressive strength of hardened cement paste by 24.73%and 55.28%,respectively.FGO exhibited a greater dispersibility,refined pore structure in cement paste,and finally improved the mechanical properties of cement composites.

关 键 词：功能化氧化石墨烯 水泥 碱性环境 模拟孔隙溶液 分散 

分 类 号：TQ127.1[化学工程—无机化工]