TY - GEN
T1 - Nanotip-induced ultrahigh pressure-sensitive cement-based composite and its pressure-sensitive characteristic model
AU - Han, Bao Guo
AU - Sun, Sheng Wei
AU - Ou, Jin Ping
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Cement-based composite
KW - Field emission effect
KW - Pressure-sensitive characteristic model
KW - Pressure-sensitivity
KW - Spiky spherical nickel powder
KW - Tunneling effect
UR - https://www.scopus.com/pages/publications/84891937690
U2 - 10.4028/www.scientific.net/AMR.873.325
DO - 10.4028/www.scientific.net/AMR.873.325
M3 - 会议稿件
AN - SCOPUS:84891937690
SN - 9783037859698
T3 - Advanced Materials Research
SP - 325
EP - 332
BT - 8th China National Conference on Functional Materials and Applications
T2 - 8th China National Conference on Functional Materials and Applications, NCFMA 2013
Y2 - 23 August 2013 through 26 August 2013
ER -