Wang Y., Chen C. «Traveling Surface Acoustic Wave Induced Removal of NSB Proteins from the Acoustic Biosensor» Acoustical Physics, 70, № 1, с. 90-104 (2024)

One challenge of current biosensors is to remove non-specifically bound (NSB). Surface acoustic wave (SAW) technology, because of its non-contact and non-marker characteristics, becomes one of the hot research fields and shows great prospects. In this paper, SAW is used to remove NSB. Firstly, the effect of the cut of the piezoelectric material on the removal force is determined based on the dispersion equation of the acoustic wave and the properties of the piezoelectric material. Secondly, the effects of channel height, excitation voltage and fluid medium temperature on the removal process are verified through theoretical calculations. The results show that the SAW force, lift force and drag force induce by the SAW can effectively remove the NSB, among which, SAW force mainly removes the nonspecifically bound from sensor surface, while the lift force and drag force mainly prevent the re-deposition of the removed NSB. Finally, the optimal region where NSB can be removed effectively by SAW is determined by comparing the SAW force and van der Waals force. When the sensing region is located in the optimal region, not only can the NSB be effectively removed, but also the performance of the sensor is guaranteed.

Raza M., Ahsan M., Wee M.F.M.R., Baqir M.A. «Investigation of Open Cloaking of Acoustic Fields via Transformation Optics» Acoustical Physics, 70, № 1, с. 76-81 (2024)

The conventional cloak has been studied in vast space while the open cloaking is explored in a few articles and there is a dire need for further investigations in this field. The open cloaks provide a way to exchange information data from the cloaked region to outside and vice versa. In this work, we have investigated the open cloaking phenomenon in acoustic fields at an audible frequency. This study will be helpful in developing a Multiphysics open cloaking platform and cloaked will enable to transfer or prohibition of the exchange of material from one region to another.

Nartov F.A., Williams R.P., Khokhlova V.A. «Electronic Focus Steering Capabilities of a Diagnostic-Type Linear Ultrasound Array Designed for High Power Therapy and Its Visualization» Acoustical Physics, 70, № 1, с. 165-174 (2024)

The focus steering capabilities of a 1 MHz linear phased array transducer (64 rectangular elements, 14.8×51.2 mm aperture) intended for drug delivery applications in abdominal organs were assessed and compared with its design-stage computer model. Acoustic fields generated by the transducer and predicted by the models of an ideal array with uniformly vibrating elements and either a plane or a cylindrically focused surface were simulated using the Rayleigh integral and angular spectrum methods. The boundary conditions for the transducer were reconstructed from acoustic holography measurements performed for selected focusing configurations of the array and also synthesized from holography data measured for each of its individual elements. It was shown that the transducer field with electronic focus steering can be accurately synthesized based on the holography data of its elements, which significantly simplified acoustic field characterization. Variability of the power and directivity patterns of the array elements were analyzed. A twofold smaller range of electronic steering in the transverse direction for the transducer compared to its computer model is discussed.