Synthesis of sodium silicate-based silica aerogels with graphene oxide by ambient pressure drying

被引:11
作者
Cakmak, Oznur Kaya [1 ]
Hassan, Khalil T. [1 ]
Wang, Jiabin [1 ]
Han, Xiao [1 ]
Siller, Lidija [1 ]
机构
[1] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
关键词
Composite aerogels; GO; Mechanical properties; Physical properties; Waterglass; MECHANICAL-PROPERTIES; THERMAL INSULATION; METHYLTRIETHOXYSILANE; REDUCTION; PROPERTY;
D O I
10.1007/s10934-021-01103-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Here we study how graphene oxide affects silica aerogels and their physical and mechanical properties by examining volume shrinkage, pore volume, surface area and compressive strength of these composite aerogels. Composite aerogels were made through adding different amount of graphene oxide (GO) to sodium silicate precursor by using ambient pressure drying method. Additionally, the chemical composition of the composite aerogels was determined using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. A rougher structure was observed when the GO loading increased and the characteristic peak of GO in XRD disappeared due to the random distribution of GO within the silica matrix. FTIR spectrum of composite aerogels shows that the relative intensity of silanol groups on the silica matrix have downward tendency with the addition of GO. The specific surface area had maxima with the addition of 0.01 wt% GO surface area to 578 m(2) /g. The mechanical strength of aerogels was increased, with the loading of GO from 0.0 wt% to 0.2 wt%, and the compressive modulus increased from 0.02 MPa to 0.22 MPa.
引用
收藏
页码:1545 / 1552
页数:8
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