水晶振動子（QCM）を用いた表面力測定に関する基礎研究

（材料による共振周波数シフトの違い）

抄録

In this study, quartz crystal microbalance (QCM) was introduced into the highly-precise surface force apparatus, to simultaneously measure the surface force and resonant frequency shift during the contact. Two spherical probes of PDMS and BK7 were used as the counter materials. With the PDMS probe, the decrease of resonant frequency was observed in contact with the Au coated crystal. The resonant frequency shift showed a linear relationship with the surface force in the lifting up process, while it showed a linear relationship with the contact radius of JKR theory in the withdrawal process. On the contrary, with the BK7 probe, an increase of resonant frequency was observed. The resonant frequency shift showed a linear relationship with the contact area of Hertzian contact theory in the lifting up process, while it showed a linear relationship with the contact area of DMT theory in the withdrawal process.