Breaking piezoelectric limits of molecules for biodegradable implants

In the quest for optimizing biodegradable implants,the exploration of piezoelectric materials stands at the forefront of biomedical engineering research.Traditional piezoelectric materials often suffer from limitations in biocompatibility and biodegradability,significantly impeding their in vivo study and further biomedical application.By leveraging molecular engineering and structural design,a recent innovative approach transcends the conventional piezoelectric limits of the molecules designed for biodegradable implants.The biodegradable molecular piezoelectric implants may open new avenues for their applications in bioenergy harvesting/sensing,implanted electronics,transient medical devices and tissue regeneration.

Electrochemically modified piezoelectric crystal biosensor for detection of Staphylococcus aureus

Electropolymerized o-phenylenediamine firm is used as a functional coating for the immobilization of anti-S. aureus antibody on the surface of a gold-plated piezoelectric crystal, and this piezoelectric immunosensor is applied to detect S. aureus. The frequency shift (Delta F = F-20s - F-380s, Hz) between the frequency at the 20th second (after the addition of sample, F-20s) and that at 380 seconds later (F-380s) was introduced to construct a calibration graph, and shortening of assay time was achieved. The S. aureus concentrations in the range of 10(5)-10(9) cells/mL can be detected by this system.

SH Waves in(1-x)Pb(Mg_(1/3)Nb_(2/3))O_(3-x)PbTiO_3 Piezoelectric Layered Structures Loaded with Viscous Liquid

The velocity dispersion and attenuation of shear horizontal（SH） waves in a layered piezoelectric structure loaded with viscous liquid is studied,where the（1- x）Pb（Mg（1/3）Nb（2/3））O（3-x）PbTiO3[PMN-xPT]single crystal is chosen as the piezoelectric layer.The PMN-xPT is being polarized along[011]c and[001]c so that the macroscopic symmetries are mm 2 and 4 mm,respectively.For the nonconductive liquid,the electrically open and shorted conditions at the interface between the liquid and the piezoelectric layer are considered.The phase velocity equations are derived analytically.The effects of the electrically boundary condition,the viscous coefficient and mass density of liquid as well as the thickness of the PMN-xPT layer on the phase velocity and attenuation are graphically illustrated.The results show that the phase velocity for the[011]c polarized PMN-0.29 PT is much smaller than that for the[001]c polarized PMN-0.33 PT,and the effects of viscous coefficient and piezoelectric layer thickness on the phase velocity for the[011]c case are stronger than that for the[001]c case.In addition,the electrical boundary conditions have an obvious influence on the propagation behaviors.These results can be useful for the designs and applications of acoustic wave devices and liquid biosensors.