改进Hummers法制备氧化石墨烯及其表征

通过增加高锰酸钾的用量,并将体系改为浓H2SO4与H3PO4的体积比为9:1,对传统Hummers法进行改进,将利用改进后的Hummers法所制得的I-GO与以传统Hummers法所制得的H-GO进行对比,结果表明,改进Hummers法不但工艺简单易操作,而且所制备的氧化石墨烯不仅具备更多数量的羟基和羧基,且含有一定数量的环氧基团,同时层间距较大,更方便之后的超声剥离,制备层数较少的氧化石墨烯.

Synthesis and Characterization of Graphene Oxide with Improved Hummers Method

Semi-infinite beam is extended from free end to infinitely long beam. Based on solutions for infinitely long beam on Winkler foundation, the shear force and bending moment at the free end of semi-infinite beam under the concentrated couples are derived. The external load applied at the free end is obtained by using the condition of the free end to meet zero moment and zero shear. The deflections at the action points are calculated separately under external loads and concentrated couples and the deflection at the action points are calculated under superposition of concentrated couples and external loads, and the calculation formula for cantilever influence coefficient with the action of concentrated couple is presented. According to the conditions of static equilibrium and deformation compatibility, general formulas for distribute load on joints of cantilever crossed foundation beams under vertical load and moments are given.