Magnetostrictive Microcantilever as Micro-Biosensor Platform

2004 ◽  
Vol 855 ◽  
Author(s):  
Suiqiong Li ◽  
Zhimin Li ◽  
Lisa Orona ◽  
Z.-Y. Cheng
Keyword(s):  
Theoretical Calculation ◽  
High Performance ◽  
The State ◽  
Yeast Cells ◽  
Q Value ◽  
Resonance Behavior ◽  
Merit Factor ◽  
Sensor Platform ◽  
State Of Art

ABSTRACTIn this paper, a novel micro-biosensor platform - magnetostrictive microcantilever (MSMC) - is reported. The resonance behavior and the sensitivity of MSMC as sensor platform were characterized and compared to the theoretical calculation. The detection of yeast cells using the biosensor made of MSMC was reported. The results demonstrate the feasibility of MSMC as a high performance biosensor platform. Compare to current microcantilevers, which is widely considered as the state-of-art sensor platform, the MSMCs have following advantages: 1) remote/wireless driving and sensing; 2) easy to fabricate. More importantly, it is experimentally found that the quality merit factor (Q value) of MSMC can reach more than 250, which is much higher than other cantilevers.

Electroactive Polymer Based Micro-ElectroMechanical System as Biosensor Platform

2004 ◽  
Vol 855 ◽  
Author(s):  
Zhimin Li ◽  
Suiqiong Li ◽  
Z.-Y. Cheng
Keyword(s):  
Liquid Medium ◽  
Electromechanical System ◽  
Electroactive Polymer ◽  
Q Value ◽  
Damping Effect ◽  
Merit Factor ◽  
Sensor Platform ◽  
Resonance Frequencies ◽  
Micro Sensor ◽  
Micro Electromechanical System

ABSTRACTA micro-electromechanical diaphragm (MEMD) as micro-sensor platform is introduced. The performance of a MEMD is compared with that of a microcantilever (MC). It is theoretically found that the sensitivity of a MEMD is about 50 times higher than that of a MC. The measured resonance frequencies in air proved the validity of the MEMD design. More importantly, the quality merit factor (Q value) of MEMD is higher than that of MC. The damping effect of liquid medium on a MEMD is much smaller than on a MC. It is experimentally demonstrated that the MEMD works well in both air and liquid.

Development of Novel Magnetostrictive Fe-Co-B Thin Films as a High Frequency Sensor Platform

2015 ◽  
Vol 1720 ◽  
Author(s):  
Zhizhi Sheng ◽  
Z.-Y. Cheng
Keyword(s):  
Thin Films ◽  
High Frequency ◽  
Deposition Time ◽  
Nanocrystalline Structure ◽  
Deposition Condition ◽  
Potential Candidate ◽  
Q Value ◽  
Resonance Behavior ◽  
Frequency Sensor ◽  
Sensor Platform

ABSTRACTFe-Co-B was identified as a potential candidate for the development of high-frequency sensors and high-frequency actuators. To fabricate high-frequency magnetostrictive resonators, Fe-Co-B magetostrictive thin films were prepared by combining electrochemical deposition and microfabrication processes. It is crucial to obtain thin films with proper microstructure and composition. Results showed that Fe-rich Fe-Co-B thin films exhibited better resonance behavior than those with Co-rich and equiatomic Fe and Co compositions. It is also found that the deposition condition plays an important role on the performance of the films. Fe55Co28B17 thin films were fabricated under the same current density for different times. The films exhibited nanocrystalline structure, circular nodules as surface morphology and good resonance behavior. Fe/Co ratio on surface and cross section slightly decreased with increasing the deposition time. The resonance frequency slightly increased and the Q value was found to decrease with increasing deposition time.

Applications of Smart Materials in the Developement of High Performance Biosensors

2005 ◽  
Vol 888 ◽  
Author(s):  
Z.-Y. Cheng
Keyword(s):  
Food Safety ◽  
Smart Materials ◽  
Medical Diagnosis ◽  
High Performance ◽  
High Sensitivity ◽  
Q Value ◽  
Remote Sensors ◽  
Nano Scale ◽  
Sensor Platform ◽  
Very High

ABSTRACTHigh performance biosensors are urgently needed from medical diagnosis, to food safety/security, to the war on bio-terrorist. The smart materials play an important role in the development of high performance sensor platform. Biosensors based on microcantilevers have very high sensitivity. The microcantilevers made of different materials, such silicon, piezoelectric and magnetostrictive materials, are discussed and compared in this paper. The magnetostrictive-based microcantilevers exhibit the best performance among all microcantilevers. A new sensor platform – magnetostrictive particles (MSPs) – is reported. The advantages of MSPs over microcantilevers are experimentally demonstrated. The MSPs are wireless/remote sensors, which makes it is possible to employ the MSP-based biosensors in different environments/media. The fabrication of MSPs in micro to nano-scale is reported. Compared with the microcantilevers, MSPs exhibit a better mass sensitivity and a higher Q value, which make the MSPs a much higher overall sensitivity.

Resonance behavior of metallic glass resonators and their application as sensor platform

2011 ◽  
Vol 1300 ◽  
Author(s):  
K.W. Zhang ◽  
L.L. Fu ◽  
S.Q. Li ◽  
Z.-Y. Cheng
Keyword(s):  
Metallic Glass ◽  
High Sensitivity ◽  
Vibration Modes ◽  
Sensor Surface ◽  
Target Species ◽  
Mechanical Resonators ◽  
Magnetic Bias ◽  
Resonance Behavior ◽  
Merit Factor ◽  
Sensor Platform

Utilizing magnetostrictive effect, the metallic glass is used to form mechanical resonators with different configurations. The resonance behaviors of these resonators are studied under different conditions, including different dc magnetic bias fields and different ac magnetic driving field. It is found that the resonators made of metallic glass exhibit a higher quality merit factor. Based on the results, it is also found that the acoustic wave velocity of the metallic glass decreases with increasing frequency. The application of these resonators as sensor platform is investigated. It is found that both odd and even vibration modes can be detected. Therefore, it provides a unique device that is capable to detect the target species on the sensor surface without “blind point(s)”, which is a challenge for all sensors based on other types of resonators. For the biosensors based on these resonators, a high sensitivity was observed. The advantages of these sensors over the current devices are demonstrated by the detection of Salmonella typhimurium (S. typhimurium) in water.

Electrosynthesis of Magnetostrictive Nanosensor Array

2005 ◽  
Vol 900 ◽  
Author(s):  
Suiqiong Li ◽  
Lisa Orona ◽  
Liling Fu ◽  
Z.-Y. Cheng
Keyword(s):  
Thin Films ◽  
Hysteresis Loop ◽  
Electrochemical Deposition ◽  
Coercive Field ◽  
High Performance ◽  
Fabrication Process ◽  
Resonance Behavior ◽  
Sensor Platform ◽  
Magnetization Hysteresis Loop ◽  
Length Direction

ABSTRACTMagnetostrictive nanobars as sensor platform were induced. Based on the resonance behavior of strips made from thin films, it is identified that the amorphous Fe-B alloy is a good candidate for fabricating high performance sensor platform. The fabrication process of amorphous Fe-B nanobars using electrochemical deposition is reported. The magnetization hysteresis loop of Fe-B nanobars with the diameters of 50, 100 and 200 nm, respectively, was characterized. It is found that, for all nanobars, the coercive field measured along length direction is smaller than the coercive field measured perpendicular to length direction. The physics behind the phenomena is discussed.

Opponent Center-Surround Contrast: Colour to Grey Conversion

2020 ◽  
Vol 2020 (1) ◽  
pp. 105-108
Author(s):  
Ali Alsam
Keyword(s):  
Evolutionary Algorithms ◽  
Three Dimensional ◽  
The State ◽  
Colour Space ◽  
Vision Science ◽  
State Of Art ◽  
Over Time

Vision is the science that informs us about the biological and evolutionary algorithms that our eyes, opticnerves and brains have chosen over time to see. This article is an attempt to solve the problem of colour to grey conversion, by borrowing ideas from vision science. We introduce an algorithm that measures contrast along the opponent colour directions and use the results to combine a three dimensional colour space into a grey. The results indicate that the proposed algorithm competes with the state of art algorithms.

Kidney transplantation in identical twins: the state of art and a case report

2019 ◽  
Vol 21 (4) ◽  
pp. 458-465
Author(s):  
A.I. Sushkov ◽  
◽  
T.A. Astrelina ◽  
E.V. Shestero ◽  
V.A. Nikitina ◽  
...  
Keyword(s):  
Kidney Transplantation ◽  
Case Report ◽  
The State ◽  
Identical Twins ◽  
State Of Art

About Measures of the State Support for Technical Equipment of Agricultural Producers

2020 ◽  
pp. 20-27
Author(s):  
A.Ya. Kibirov ◽  
Keyword(s):  
Statistical Analysis ◽  
Energy Saving ◽  
High Performance ◽  
The State ◽  
Agricultural Products ◽  
Technical Equipment ◽  
Agricultural Machinery ◽  
State Support ◽  
Agricultural Producers ◽  
Technical Base

The article uses methods of statistical analysis, deduction and analogy to consider programs at the Federal, regional and economic levels, which provide for measures aimed at improving the technical equipment of agricultural producers. Particular attention is paid to the acquisition of energy-saving, high-performance agricultural machinery and equipment used in the production and processing of agricultural products. An assessment of the effectiveness of state support for updating the material and technical base of agriculture is given. Based on the results of the study, conclusions and recommendations were formulated.

scholarly journals A Review of Size Engineering-Enabled Electrocatalysts for Li–S Chemistry

2021 ◽  
Author(s):  
Xi Zhang ◽  
Yaping Zhang ◽  
xijun wei ◽  
Chaohui Wei ◽  
Yingze Song
Keyword(s):  
Energy Density ◽  
High Energy ◽  
The State ◽  
High Energy Density ◽  
State Of Art

Li–S batteries (LBSs) have received extensive attention owing to their remarkable theoretical capacity (1672 mA h g–1) and high energy density (2600 Wh kg–1), far beyond the state of art...

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