Nanotip-induced Ultrahigh Pressure-sensitive Cement-based Composite and Its Pressure-sensitive Characteristic Model
(0) A smart composite is fabricated from cement-matrix and spiky spherical nickel powders.The electrical resistivity of such composite decreases 69.00% under uniaxial compression.The gage factor of this composite is higher than 895.45 within the elastic regime.This ultrahigh pressure-sensitivity is attributed to the unique needle-like surface morphology of nickel powers.Comparing to the normal smooth spherical nickel particles, the needle-like features of spiky spherical nickel particles can induce field emission and tunneling effects, which leads to highly sensitive responses to strain.A constitutive model relating the change in electrical resistivity to strain of the composite is built within the elastic regime.This model incorporates the field emission effect and the inter-particle separation change of nickel powders in composite.The model is used to predict the pressure-sensitive characteristic behavior of the composite.The predicted result is compared with the experimental data obtained on the composite, and good agreement is obtained.
Cement-based composite Spiky spherical nickel powder Pressure-sensitivity Field emission effect Tunneling effect Pressure-sensitive characteristic model
Bao-guo Han Sheng-wei Sun Jin-ping Ou
School of Civil Engineering, Dalian University of Technology, Dalian, 116024 China School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090 China School of Civil Engineering, Dalian University of Technology, Dalian, 116024 China; School of Civil
国际会议
The Eighth China National Conference on Functional Materials and Applications(第八届中国功能材料及其应用学术会议)
哈尔滨
英文
325-332
2013-08-23（万方平台首次上网日期，不代表论文的发表时间）