1,721,055 research outputs found
Datasets for 'Generation of functional hepatocyte 3D discoids in an acoustofluidic bioreactor'
Full text linkThis dataset supports the publication: 'Generation of functional hepatocyte 3D discoids in an acoustofluidic bioreactor' By: Khedr, Mogib; Messaoudi, Walid, Mohamed; Jonnalagadda, Umesh; Abdelmotelb, Ahmed; Glynne-Jones, Peter; Hill, Martyn; Khakoo, Salim I; Abu Hilal, Mohammad. In: Biomicrofluidics</span
Vibration powered generators for self-powered microsystems
No full textMethods are examined for deriving energy from vibrations naturally present around sensor systems. Devices of this type are described in the literature as self-powered. This term is defined as describing systems that operate by harnessing ambient energy present within their environment. Traditionally, remote devices have used batteries to supply their energy, which offer only a limited life span to a system. The recent rapid advances in integrated circuit technology have not been matched by similar advances in battery technology, thus, power requirements place important limits on the capability of modern remote microsystems. Self-power offers a potential solution to power requirement, and when combined with some form of wireless communications, can produce truly wireless autonomous systems.A generator based on the thick-film piezoelectric material, PZT, is produced. The resulting device is tested, and methods are devised to measure the material properties of its constituent layers. Power output is low at only 3μW. Modelling shows that the low power output is due to the low electromagnetic coupling of thick-film PZT. The modelling includes the development of a new method of a resistively shunted piezoelectric element undergoing pure bending. Numerical optimisation is used to predict the power output from piezoelectric generators of arbitrary dimensions and excitation conditions.Experiments have been devised to assess the long-term stability of thick film PZT materials. A technique for measuring the ageing rate of the d31 and K33 coefficients of a PZT thick-film sample is presented. The d31 coefficient is found to age at -4.4% time decade, and K33, at -1.34% per time decade (PZT-5H).An electrical equivalent circuit model of a generator based on electromagnetic induction has been described, and verified by producing a prototype generator. The prototype could produce 4.9mW in a volume of 4cm3 at a resonant frequency of 99Hz. A typical configuration is modelled, and numerical methods used to find optimum generator dimensions, and predict power output for various excitations. The model is used to compare this type of generator to piezoelectric generators, and hence evaluate the two technologies. Graphs are produced to permit estimates of how much power could be produced by either generator type under arbitrary excitation conditions. It is concluded that neither generator type is superior under all excitation conditions, but that severe manufacturing difficulties with piezoelectric generators mean that they are unlikely to be commonly used in future applications.</p
Data set for "Acoustofluidic phase microscopy in a tilted segmentation-free configuration"
No full textData relating to paper:
"Acoustofluidic phase microscopy in a tilted segmentation-free configuration" in Biomicrofluidics.</span
Acoustofluidics 23: acoustic manipulation combined with other force fields
Full text linkIn this, the final paper of the Acoustofluidics series of tutorial articles, we discuss applications in which acoustic radiation forces are used in conjunction with competing or complementary force-fields. This may be in order to enable manipulation operations that would not be easily performed by either force-field alone, or may be used to effect separation based on the different physical principals underlying competing fields. Examples are given of a number of different applications in which acoustic forces are combined with gravitational fields, hydrodynamic forces, electric fields (including dielectrophoresis), magnetic forces and optical forces
High throughput imaging cytometer with acoustic focussing
Full text linkThis dataset contains data generated during research for the paper "High throughput imaging cytometer with acoustic focussing". DOI: 10.1039/C5RA19497K </span
Effects of surface profile on a boundary-driven acoustic streaming field
No full textAcoustic streaming fields in two-dimensional rectangular enclosures that have structured boundaries are simulated and the effects of surface profile amplitude on a boundary-driven acoustic streaming field are numerically investigated. The standing wave fields in the enclosures are generated by excitation of a boundary and a sine-wave shaped profile on a boundary parallel to the particle oscillations is considered. This surface profile is found to have a large influence on the magnitude of both outer and inner streaming velocities. In terms of streaming pattern, it is found that the number of inner streaming vortices is dependent on the wavelength of profile while this profile has a less significant effect on the outer vortex pattern
Numerical simulation of 3D acoustophoretic motion of microparticles in an acoustofluidic device
No full textAcoustic streaming is typically found in addition to acoustic radiation forces in acoustofluidic devices. Simulation of acoustic streaming is a crucial step for the understanding of its origins, which can provide efficient guidance on creating designs to limit or control this phenomenon. However, most existing methods can only simulate the streaming field in a local area, typically a cross-section of fluid channel. In this work, the three-dimensional (3D) Rayleigh streaming pattern in an acoustofluidic device is simulated and its effects on the movement of microparticles with various sizes are demonstrated. The viability of the simulation of 3D Rayleigh streaming presented here not only can provide better understanding and more comprehensive prediction of experiments in full acoustofluidic devices, but also can offer instructions on the simulation of unusual acoustic streaming patterns, e.g. transducer-plane streamin
Acoustic streaming in the transducer plane in ultrasonic particle manipulation devices
No full textIn acoustofluidic manipulation and sorting devices, Rayleigh streaming flows are typically found in addition to the acoustic radiation forces. However, experimental work from various groups has described acoustic streaming that occurs in planar devices in a plane parallel to the transducer face. This is typically a four-quadrant streaming pattern with the circulation parallel to the transducer. Understanding its origins is essential for creating designs that limit or control this phenomenon. The cause of this kind of streaming pattern has not been previously explained as it is different from the well-known classical streaming patterns such as Rayleigh streaming and Eckart streaming, whose circulation planes are generally perpendicular to the face of the acoustic transducer. In order to gain insight into these patterns we present a numerical method based on Nyborg's limiting velocity boundary condition that includes terms ignored in the Rayleigh analysis, and verify its predictions against experimental PIV results in a simple device. The results show that the modelled particle trajectories match those found experimentally. Analysis of the dominant terms in the driving equations shows that the origin of this kind of streaming pattern is related to the circulation of the acoustic intensity
Dataset for the paper titled "Insights into transducer-plane streaming patterns in thin-layered acoustofluidic devices"
No full textData collected for research presented in paper "Insights into transducer-plane streaming patterns in thin-layered acoustofluidic devices". Physical Review Applied 2017
Funded by EPSRC Doctoral Training Partnership (EP/N509747/1).</span
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