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Amorphous microwires with enhanced magnetic softness and GMI characteristics  [cached]
Zhukov A.,Ipatov M.,Zhukova V.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122900052
Abstract: In this paper we present results on correlation of GMI effect and soft magnetic behavior in Co-rich microwires with low magnetostriction constant. Correlation between magnetoelastic anisotropy and magnetic field dependences of diagonal and off-diagonal impedance components are observed. Low field GMI hysteresis, explained in terms of magnetoelastic anisotropy of microwires, has been suppressed by the bias current.
EFFECT OF CRYSTALLIZATION ON ACTIVATED DISSOLUTION BEHAVIOUR OF AMORPHOUS FeNiSiB ALLOYS
晶化程度对FeNiSiB非晶合金活性溶解行为的影响

LI Ying,SONG Guangling,CAO Chunan,LIN Haichao Corrosion Science Laboratory,
李瑛
,宋光铃,曹楚南,林海潮

金属学报 , 1993,
Abstract: The corrosion behaviour of FeNiSiB amorphous alloys under different heattreatments has been studied by potentiodynamic polarization method and impedencemeasurement system. The dissolution activity of FeNiSiB amorphous alloys with differentcrystallization states is dependent upon the difference in their phase contents.
Electrochemical Based Biosensors  [PDF]
Chung Chiun Liu
Biosensors , 2012, DOI: 10.3390/bios2030269
Abstract: This editorial summarizes the general approaches of the electrochemical based biosensors described in the manuscripts published in this Special Issue. Electrochemical based biosensors are scientifically and economically important for the detection and early diagnosis of many diseases, and they will be increasing used and developed in the coming years. The importance of the selection of recognition processes, fabrication techniques and biosensor materials will be introduced.
Biosensors based on gold nanostructures
Vidotti, Marcio;Carvalhal, Rafaela F.;Mendes, Renata K.;Ferreira, Danielle C. M.;Kubota, Lauro T.;
Journal of the Brazilian Chemical Society , 2011, DOI: 10.1590/S0103-50532011000100002
Abstract: the present review discusses the latest advances in biosensor technology achieved by the assembly of biomolecules associated with gold nanoparticles in analytical devices. this review is divided in sections according to the biomolecule employed in the biosensor development: (i) immunocompounds; (ii) dna/rna and functional dna/rna; and (iii) enzymes and heme proteins. in order to facilitate the comprehension each section was subdivided according to the transduction mode. gold nanoparticles based immunosensors have a wide range of applications in food, environmental, pharmaceutical, chemistry and clinical diagnostics. the nanoparticles were employed to improve whether the analytical signal or the immunocompounds immobilization. in another section, biosensors based on dna/rna biomolecules employing gold nanostructures as labels and label-free funtional dna/rna biosensors associated to gold nanostructures as tranducers were systematically reported for rapid identification of pathogens, species of environmental interest and clinical diagnostics, respectively. the inclusion of gold nanoparticles in modified electrodes itself enhances the electron transfer between the transducer and biomolecules leading to improved bioanalytical devices when redox enzymes and heme proteins are used. biosensors for the detection and quantification of glucose and hydrogen peroxide are discussed as well.
Low-cost Sensors Based on the GMI Effect in Recycled Transformer Cores  [PDF]
Pongsakorn Jantaratana,Chitnarong Sirisathitkul
Sensors , 2008, DOI: 10.3390/s8031575
Abstract: Sensors based on the giant magnetoimpedance (GMI) effect in silicon steelswere constructed. Strips of silicon steels (0.500 mm-thick, 35.0 mm-long) with widthsranging from 0.122 to 1.064 mm were cut from recycled transformer cores. Since amaximum GMI ratio of 300% and a maximum field sensitivity of 1.5%/Oe were observedin a 1.064 mm-wide sample at 200 kHz, the 1.064 mm-wide strips were chosen as sensingelements in a slot key switch, angular velocity sensor, current sensor and force sensor. Thesensing elements were integrated into electronic circuits and the changes in impedancewere monitored. Variations in voltage due to these changes were typically small and musttherefore be amplified by the electronic circuits. For the current sensor and force sensor,the variation in the voltage drop across the GMI sensing element had non-linear variationswith either current or force and a conversion formula from a computer program wastherefore needed. The performance of the systems was tested. These sensing systems werestable, highly sensitive, hysteresis-free and could be produced on a mass scale. Based ontheir GMI effect, the silicon steels are versatile alternative low-cost sensors.
Low-cost Sensors Based on the GMI Effect in Recycled Transformer Cores
ongsakorn Jantaratana,Chitnarong Sirisathitkul
Sensors , 2008,
Abstract: Sensors based on the giant magnetoimpedance (GMI) effect in silicon steelswere constructed. Strips of silicon steels (0.500 mm-thick, 35.0 mm-long) with widthsranging from 0.122 to 1.064 mm were cut from recycled transformer cores. Since amaximum GMI ratio of 300% and a maximum field sensitivity of 1.5%/Oe were observedin a 1.064 mm-wide sample at 200 kHz, the 1.064 mm-wide strips were chosen as sensingelements in a slot key switch, angular velocity sensor, current sensor and force sensor. Thesensing elements were integrated into electronic circuits and the changes in impedancewere monitored. Variations in voltage due to these changes were typically small and musttherefore be amplified by the electronic circuits. For the current sensor and force sensor,the variation in the voltage drop across the GMI sensing element had non-linear variationswith either current or force and a conversion formula from a computer program wastherefore needed. The performance of the systems was tested. These sensing systems werestable, highly sensitive, hysteresis-free and could be produced on a mass scale. Based ontheir GMI effect, the silicon steels are versatile alternative low-cost sensors.
Gold nanoparticle-based biosensors
Yuanyuang Li,Hermann J. Schluesener,Shunqing Xu
Gold Bulletin , 2010, DOI: 10.1007/BF03214964
Abstract: The unique properties of gold nanoparticles have stimulated the increasing interest in the application of GNPs in interfacing biological recognition events with signal transduction and in designing biosensing devices exhibiting novel functions. The optical properties of GNPs provide wide range opportunities for construction optical biosensors. The excellent biocompatibility, conductivity, catalytic properties and high surface-to-volume ratio and high density of GNPs facilitate extensive application of GNPs in construction of electrochemical and piezoelectric biosensors with enhanced analytical performance with respect to other biosensor designs. In this article, the recent advances in construction of GNP-based optical, electrochemical and piezoelectric biosensors are reviewed, and some illustrative examples given, with a focus on the roles GNPs play in the biosensing process and the mechanism of GNPs for improving the analytical performances. Finally, the review concludes with an outline of present and future research for the real-world applications.
Study of the influence mechanism of additional elements on the corrosion behavior of bulk Cu-based amorphous alloys
铜基大块非晶合金添加微量元素对腐蚀行为的影响机理研究

Zhang Hui,Wu Di,Zhang Guo-Ying,Xiao Ming-Zhu,
张辉
,吴迪,张国英,肖明珠

物理学报 , 2010,
Abstract: The liquid state Cu-Al alloy system was simulated by using the molecular dynamics method, then Cu-Al amorphous alloy is obtained by cooling process simulation. This article firstly sets up crystalline Cu-Al alloy liquid by using the molecular dynamics. The models of Cu-Al-M bulk amorphous alloys, their clean surfaces and their surfaces with O adsorption are set up by computer programming. The influence mechanism of additional elements Zr, Nb, Ta, V, Y and Sc on the corrosion behavior of bulk Cu-based amorphous alloys are investigated by using real-place recursive method. Results show that the alloying elements do not aggregate on the clean surface of bulk Cu-based amorphous alloys, but tend to aggregate on the surface with O adsorption with the exception of Y, which indicates that the segregation of the bulk Cu-based amorphous alloy surface with O adsorption is reversed. Calculations of the total bond order integral show that additional element can interact with oxygen easily to form oxide film on the surface of Cu-based amorphous alloys, which can improve the corrosion resistance of bulk Cu-based amorphous alloys. The improvement in corrosion resistance of Cu-based metallic glass with Y addition may be due to the aggregation of Y to the interface between alloy and oxide film, which improves the adhesion.
Tiny Medicine: Nanomaterial-Based Biosensors  [PDF]
Yeo-Heung Yun,Edward Eteshola,Amit Bhattacharya,Zhongyun Dong,Joon-Sub Shim,Laura Conforti,Dogyoon Kim,Mark J. Schulz,Chong H. Ahn,Nelson Watts
Sensors , 2009, DOI: 10.3390/s91109275
Abstract: Tiny medicine refers to the development of small easy to use devices that can help in the early diagnosis and treatment of disease. Early diagnosis is the key to successfully treating many diseases. Nanomaterial-based biosensors utilize the unique properties of biological and physical nanomaterials to recognize a target molecule and effect transduction of an electronic signal. In general, the advantages of nanomaterial-based biosensors are fast response, small size, high sensitivity, and portability compared to existing large electrodes and sensors. Systems integration is the core technology that enables tiny medicine. Integration of nanomaterials, microfluidics, automatic samplers, and transduction devices on a single chip provides many advantages for point of care devices such as biosensors. Biosensors are also being used as new analytical tools to study medicine. Thus this paper reviews how nanomaterials can be used to build biosensors and how these biosensors can help now and in the future to detect disease and monitor therapies.
Cholinesterase based amperometric biosensors for assay of anticholinergic compounds
Miroslav Pohanka
Interdisciplinary Toxicology , 2009, DOI: 10.2478/v10102-009-0011-5
Abstract: Biosensors are analytical devices being approachable for multiple analytes assay. Here, biosensors with intercepted acetylcholinesterase (AChE) or butyrylcholinesterase (BChE) are presented as tool for assay of anticholinergic compounds such as pesticides, nerve agents and some natural toxins. Principle of assay is based on evaluation of cholinesterase activity and its pertinent decrease in presence of analyte. Nerve agents, pesticides, anticholinergic drugs useable for treatment of Alzheimer's disease as well as myasthenia gravis and aflatoxins are enlisted as compounds simply analyzable by cholinesterase biosensors.
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