Acoustic properties of alumina colloidal/polymer nano-composite film on silicon.
Alumina colloidal/polymer composite films on silicon substrates have been successfully fabricated using the sol-gel method, in which the crystallite sizes of alumina are between 20 and 50 nm. The density and ultrasonic phase velocities in these films with different alumina ratios from 14% to 32% were measured at the desired operating frequency. We have proved that the density, acoustic phase velocities, and hence the acoustic impedance of the nano-composite films increase with the alumina content, which gives us another option of tailoring the acoustic impedance of the nano-composite film for making the matching layer of high-frequency medical ultrasonic transducers.
Zhang
Rui
R
Cao
Wenwu
W
Zhou
Qifa
Q
Cha
Jung Hyui
JH
Shung
K Kirk
KK
Huang
Yuhong
Y
D000162:Acoustics; D000537:Aluminum Oxide / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry; D003198:Computer Simulation; D008567:Membranes, Artificial; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011829:Radiation Dosage; D011874:Radiometry; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*
D003102:Colloids; D008567:Membranes, Artificial; D011108:Polymers; D000537:Aluminum Oxide; D012825:Silicon