氧化石墨烯的还原程度对水泥砂浆复合材料性能的影响

Effect of reduction degree of graphene oxide on properties of cement mortar composites

该研究制备不同还原程度的还原氧化石墨烯(rGO),研究还原参数对水泥砂浆复合材料的抗折和抗压强度的影响。采用接触角测量仪(CA)、射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、扫描电子显微镜(SEM)和透射电镜(TEM)对材料结构进行测试和表征。结果表明,rGO的最佳还原参数为0.2 wt%水合肼和15 min还原时间;在此条件下,掺杂0.1 wt%的rGO使试样28 d的抗折和抗压强度分别达到5.80 MPa和55.10 MPa,与普通水泥砂浆相比,分别提高45.00%和83.67%。适当还原参数下制备的rGO易在水泥内部形成成核位点,并有序控制水化物晶体的生长方向,最终可改善水泥砂浆的力学性能。

In this study, different reduction degree of reduced graphene oxide(rGO) was prepared and effects of reduction parameters on the cement mortar composites were investigated. Tensiometer and contact angle meter(CA), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM) and transmission electron microscopy(TEM) were used to characterize the material structure. The results show that optimal reduction parameters of rGO were 0.2 wt% hydrazine hydrate and15 min reduction time. Under these conditions, the 28 d flexural strength and compressive strength of the cement doped with 0.1wt% rGO were 5.80 MPa and 55.10 MPa, increasing by 45.00% and 83.67% compared with ordinary cement mortar, respectively. The rGO prepared under appropriate reduction parameters was easy to form nucleation sites in the cement, and control the growth direction of hydrate crystals, which ultimately improved the mechanical properties of the cement mortar.