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Porous Ti-10Mo alloy fabricated by powder metallurgy for promoting bone regeneration

Science China Materials 2019年第7期62卷 1053-1064页

作者： Wei Xu Zhuo Liu Xin Lu Jingjing Tian Gang Chen Bowen Liu Zhou Li Xuanhui Qu Cuie Wen Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China School of Engineering RMIT University Melbourne 3001 Australia

Porous Ti-lOMo alloys were fabricated by powder metallurgy using a space-holder method. The pore characteristics, m icrostructure, mechanical properties, in vitro biocompatibility, and in vivo osseointegration of the fabricated alloys were systematically investigated. The results show that with different weight ratios of the space-holder (NH4- HC03) added, all of the porous Ti-10Mo alloys sintered at 1,300℃ exhibited a typical W idmanstatten microstructure. The porosity and average pore size of the porous structures can be controlled in the range of 50.8%-66.9% and 70.1 -381.4μm , respectively. The Ti-10Mo alloy with 63.4% porosity exhibited the most suitable mechanical properties for implant applications with an elastic modulus of 2.9 GPa and a compressive yield strength of 127.5 MPa. In vitro9 the alloyconditioned medium showed no deleterious effect on the cell proliferation. The cell viability in this medium was higher than that of the reference group, suggesting non-toxicity and good biological characteristics of the alloy specimens. In vivo, after eight weeks* implantation, new bone tissue formed surrounding the alloy implants, and no noticeable inflammation was observed at the implantation site. The bone bonding strength of the porous Ti-10Mo alloy increased over time from 46.6N at two weeks to 176.4 N at eight weeks. Suitable mechanical properties together with excellent biocompatibility in vitro and osteointegration in vivo make the porous Ti-10Mo fabricated by powder metallurgy an attractive orthopedic implant alloy.

关键词： porosity powder metallurgy structure characterization cell cytotoxicity osteointegration

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Low-Resistivity Amorphous Silicon for Contacts Using Low-Temperature Rapid Thermal Annealing

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MRS Online Proceedings Library 1992年第1期258卷 99-104页

作者： Lynnita Knoch Gordon Tam N. David Theodore Ron Pennell Advanced Custom Technology Center Motorola Inc. Mesa USA Sensor New Product Development Motorola Inc. Phoenix USA

Fabrication of SiGe heterojunction bipolar transistors (HBTs) requires a low thermal budget to avoid relaxation of the strained SiGe base layer. Ion implantation is one of the most widely used techniques to achieve contacts. However, due to thermal budget constraints, low temperature rapid thermal annealing (RTA) cycles to activate these implants are insufficient to anneal out all of the implant damage. Polysilicon contacts provide an alternative to ion implantation, but are typically annealed at high temperatures (>950°C) to achieve low sheet resistivity. In this study, amorphous silicon and polycrystalline silicon films were implanted with boron, arsenic, or phosphorus and RTA’ d at temperatures from 800°C to 950°C and compared to single crystal silicon with identical implants and RTA cycles. The films were characterized using four-point probe, Hall measurements, TEM (transmission electron microscopy), and SIMS (secondary-ion mass-spectrometry). TEM analysis shows that the amorphous deposition produces larger grains upon RTA due to more rapid grain growth than the polycrystalline deposition. The sheet resistance for the amorphous deposited films is much lower than that of the polycrystalline deposition for all implant conditions. Activations of the implants indicate that the arsenic and phosphorus segregate to the grain boundaries, while the boron does not. The segregation is more significant for the polycrystalline films than for the amorphous films and can be explained by the grain boundary area. For contacts to the SiGe HBT, which requires a low thermal budget, an amorphous deposited silicon film is advantageous over a polycrystalline film at low annealing temperatures because it has lower sheet resistance, less segregation to the grain boundaries, and produces larger grains.

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Characterization of Arsenic-Implanted Amorphous Silicon

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MRS Online Proceedings Library 1992年第1期258卷 81-86页

作者： Lynnita Knoch N. David Theodore Gordon Tam Ron Pennell Advanced Custom Technology Center Motorola Inc. Mesa USA Sensor New Product Development Motorola Inc. Phoenix USA

In this study, amorphous silicon and polycrystalline silicon films were implanted with arsenic and subjected to varied low temperature (<900°C) anneal conditions and characterized using TEM. The microstructure is of interest for later correlation with electrical measurements. The amorphous deposition produces larger, more irregular grains with more strain than does the polysilicon deposition for a single-step rapid thermal anneal (RTA) cycle. This can be explained by the number of critical nucleii and the rate of grain growth. The sheet resistivity, as measured by four-point probe, correlates to the deposition conditions. A two-stage anneal makes the grains less irregular by reducing the roughness of the grains and decreasing the strain in the grains. For a given deposition condition, the final microstructure is most strongly influenced by the first anneal. The second anneal produces no clear change in grain size. 800°C anneals result in larger grains than 900°C anneals. This is explained by the presence of less critical nucleii for 800°C anneals. In comparing short and long durations of RTA, the short duration produced slightly larger grains than the long duration RTA due to greater nucleation in the longer RTA wafers. In the case of RTA versus furnace anneals, RTA produces larger, more irregular grains, with more strain in the grains. A model in terms of the size of critical nucleii is used to explain the difference.

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Detection of trace glucose on the surface of a semipermeable membrane using a fluorescently labeled glucose-binding protein: a promising approach to noninvasive glucose monitoring

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Journal of diabetes science and technology 2013年第1期7卷 4-12页

作者： Xudong Ge Govind Rao Yordan Kostov Sunsanee Kanjananimmanont Rose M Viscardi Hyung Woo Leah Tolosa Center for Advanced Sensor Technology Department of Chemical Biochemical and Environmental Engineering University of Maryland Baltimore County Baltimore Maryland 21250 USA.

BACKGROUND:Our motivation for this study was to develop a noninvasive glucose sensor for low birth weight neonates. We hypothesized that the underdeveloped skin of neonates will allow for the diffusion of glucose to the surface where it can be sampled noninvasively. On further study, we found that measurable amounts of glucose can also be collected on the skin of adults. METHOD:Cellulose acetate dialysis membrane was used as surrogate for preterm neonatal skin. Glucose on the surface was collected by saline-moistened swabs and analyzed with glucose-binding protein (GBP). The saline-moistened swab was also tested in the neonatal intensive care unit. Saline was directly applied on adult skin and collected for analysis with two methods: GBP and high-performance anion-exchange chromatography (HPAEC). RESULTS:The amount of glucose on the membrane surface was found (1) to accumulate with time but gradually level off, (2) to be proportional to the swab dwell time, and (3) the concentration of the glucose solution on the opposite side of the membrane. The swab, however, failed to absorb glucose on neonatal skin. On direct application of saline onto adult skin, we were able to measure by HPAEC and GBP the amount of glucose collected on the surface. Blood glucose appears to track transdermal glucose levels. CONCLUSIONS:We were able to measure trace amounts of glucose on the skin surface that appear to follow blood glucose levels. The present results show modest correlation with blood glucose. Nonetheless, this method may present a noninvasive alternative to tracking glucose trends.

关键词： blood glucose fluorescence glucose-binding protein neonate noninvasive

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Effect of self-assembled iron-tannic nanoparticles on the fastness and antibacterial properties of natural indigo dyed polyester cotton blended fabrics from Strobilanthes cusia (Nees) Kuntze 17

Effect of self-assembled iron-tannic nanoparticles on the fa...

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17th Siam Physics Congress: Carbon Neutrality, SPC 2022

作者： Keereeta, Y. Srithong, S. Pranamornkith, P. Tharawatchruk, W. Boonsom, K. Klinbumrung, A. Kaowphong, S. Faculty of Science and Agricultural Technology Rajamangala University of Technology Lanna Lampang52000 Thailand Unit of Excellence on Advanced Materials for Sensor Technology School of Science University of Phayao Phayao56000 Thailand Department of Chemistry Center of Excellence in Materials Science and Technology Faculty of Science Chiang Mai University Chiang Mai50200 Thailand

In this study, self-assembled iron (III)-tannic nanoparticles (Fe-TA NPs) were synthesized at room temperature using a simple, low-cost, and reproducible method. The interaction between Fe3+ and TA, and the particle size of Fe-TA NPs with different mole ratios of ferric chloride and tannic acid were characterized by UV-vis spectroscopy and dynamic light scattering (DLS). The modified fabrics were fabricated by one-step depositing Fe-TA NPs onto the surface of natural indigo dyed polyester cotton blended fabrics using the exhaustion dyeing process. SEM, FTIR, Raman spectroscopy, and TGA were used to investigate the surface morphology, chemical structure, and thermal stability of the modified fabrics. According to the results, indigo-dyed fabrics treated with Fe-TA NPs showed an excellent antibacterial activity against both gram-negative (E. coli) and gram-positive (S. aureus) bacteria, improving of thermal stability, light fastness acceptance, washing fastness, and color fastness to heat. © Published under licence by IOP Publishing Ltd.

关键词： Thermodynamic stability

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A planar, integrated total internal reflection sensor for biofouling detection

A planar, integrated total internal reflection sensor for bi...

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2010 Solid-State sensors, Actuators, and Microsystems Workshop

作者： Nam, K.H. Choi, W. Yeo, J. Ko, S.H. Lin, Liwei Berkeley Sensor and Actuator Center University of California BerkeleyCA United States Research Center of MEMS Space Telescope Ewha Womans University Korea Republic of LG Innotek Inc Korea Republic of Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)0964002485

A planar, integrated total internal reflection (TIR) sensor for the characterizations of biofouling has been demonstrated based on angular interrogation of Fraunhofer diffraction. This sensor is made of a two-mask process to have optical prism and built-in waveguides of 4×0.25μm2 in cross section area. The core and cladding layer of the waveguide are made of silicon nitride and silicon dioxide, respectively and a 780nm in wavelength light source is used in the experiments. Water, ethanol, acetone and glycerol, have all been tested to illustrate the basic refractive index sensing principle of the prototype sensor. Biofouling measurements show that after been immersed into milk as the testing liquid, the surface refractive index of a prototype TIR sensor shifted continuously to as much as 0.0089 for a 9-hour test. As such, this technique could be useful to various biofouling control and monitoring applications, including water desalination, medical, marine and electronic device industries. © 2010TRF.

关键词： Refractive index

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Bacteria Classification Using Electronic Nose for Diabetic Wound Monitoring

Bacteria Classification Using Electronic Nose for Diabetic W...

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2013 Asian Pacific Conference on Mechatronics and Control Engineering(APCMCE 2013)

作者： Azian Azamimi Abdullah Nurlisa Yusuf Ammar Zakaria Mohammad Iqbal Omar Ali Yeon Md Shakaff Abdul Hamid Adom Latifah Munirah Kamarudin Yeap Ewe Juan Amizah Othman Mohd Sadek Yassin Center of Excellent for Advanced Sensor Technology(CEASTech)Universiti Malaysia Perlis (UniMAP) Hospital Tuanku Fauziah (HTF)

Array based gas sensor technology namely Electronic Nose(E-nose) now offers the potential of a rapid and robust analytical approach to odor measurement for medical use. Wounds become infected when a microorganism which is bacteria from the environment or patient's body enters the open wound and multiply. The conventional method consumes more time to detect the bacteria growth. However,by using this E-Nose,the bacteria can be detected and classified according to their volatile organic compound(VOC) in shorter time. Readings were taken from headspace of samples by manually introducing the portable e-nose system into a special container that containing a volume of bacteria in suspension. The data will be processed by using statistical analysis which is Principle Component Analysis(PCA) and Linear Discriminant Analysis(LDA) methods. The most common bacteria in diabetic foot are Staphylococcus aureus,Escherchia coli,Pseudomonas aeruginosa,and many more.

关键词： Electronic Nose Bacteria Infection Diabetic Foot Principle Component Analysis(PCA) Linear Discriminant Analysis(LDA)

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Linear and nonlinear optical analysis on semiorganic-proline cadmium chloride single crystal

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Chinese Physics B 2018年第4期27卷 476-482页

作者： Mohd Anis M I Baig S S Hussaini M D Shirsat Mohd Shkir H A Ghramh Department of Physics Sant Gadge Baba Amravati University Amravati-444602 Maharashtra India Ram Meghe College of Engineering and Management Amravati-444701 Maharashtra India Crystal Growth Laboratory Department of Physics Milliya Arts Science and Management Science College Beed431122 Maharashtra India RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb-Ambedkar-Marathwada University A urangabad-431005 Maharashtra India Research Center for Advanced Materials Science (RCAMS) King Khalid University P. O. Box 9004 Abha-61413 Saudi Arabia Advanced Functional Materials & Optoelectronic Laboratory (AFMOL) Department of Physics College of Science King Khalid University P. O. Box 9004 Ahha-61413 Saudi Arabia

In the current investigation,L-proline cadmium chloride monohydrate（LPCC） single crystal is grown by a slow solvent evaporation technique to identify its credibility for nonlinear optical device *** constituent elements of LPCC crystal are determined by the energy dispersive spectroscopic（EDS） *** single crystal x-ray diffraction technique is used to determine the structural dimensions of LPCC *** UV-visible studies are carried out within a wavelength range of 200 nm–1100 nm to determine the optical transmittance of LPCC *** linear optical parameters of LPCC crystal are evaluated using the transmittance data to discuss its importance for distinct optical *** Nd：YAG laser assisted Kurtz–Perry test is carried out to determine the enhancement in second harmonic generation efficiency of LPCC crystal with reference to KDP *** Z-scan technique is employed to assess the third order nonlinear optical（TONLO） properties of LPCC crystal at 632.8 *** Z-scan data are utilized to evaluate the TONLO refraction,absorption and susceptibility of LPCC *** color oriented luminescence behavior of LPCC crystal is investigated within a spectral range of 350 nm–700 *** dependence of dielectric constant and dielectric loss on temperature and frequency is evaluated through the dielectric measurement studies.

关键词： crystal growth dielectric studies nonlinear optical materials optical studies

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Small size 433 MHz On-off keying transceiver IC for sensor application

Small size 433 MHz On-off keying transceiver IC for sensor a...

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International SoC Design Conference, ISOCC

作者： Jeong-Ho Park Han-Won Cho Ji-Hoon Suh Hyung-Joun Yoo The Department of Electrical Engineering and the Mobile Sensor and IT Convergence Center Korea Advanced Institute of Science and Technology Daejeon Republic of Korea

ISBN: (纸本)9781479951284

In order to make wireless sensor nodes, low power consumption and low cost RF transceiver are required. In this work, a 433 MHz On-Off keying transceiver is designed and simulated with Dong-bu 0.11 μm CMOS process. For high data rate and power efficiency, digital pulse shaping is adopted. For small size and low power, the receiver is designed using the digital pulse-shaped signal for demodulation. The chip size is 180 × 180 μm 2 without pads.

关键词： CMOS integrated circuits Capacitors Radio frequency Logic gates Semiconductor device modeling

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A low-power polar demodulator for impedance spectroscopy based on a novel sampling scheme

A low-power polar demodulator for impedance spectroscopy bas...

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International SoC Design Conference, ISOCC

作者： Soon-Jae Kweon Jeong-Ho Park Seong-Heon Shin Hyung-Joun Yoo The Department of Electrical Engineering and the Mobile Sensor and IT Convergence Center Korea Advanced Institute of Science and Technology Daejeon Republic of Korea

This paper proposes a low-power polar demodulator for electrical impedance spectroscopy. The magnitude and phase of impedance are measured by a novel sampling scheme and an XOR-based scheme, respectively. The novel sampling scheme only requires switched capacitor circuits and clock signals that are already used in the analog-to-digital conversion and the phase measurement. Since the proposed demodulator does not require any additional circuits for the magnitude measurement, low power consumption and small die areas can be achieved. The proposed demodulator designed using a 0.18-μm CMOS process consumes about 10-mW average power with 0.23-mm 2 active area.

关键词： Demodulation Impedance Biomedical measurement Spectroscopy Phase measurement Power demand Simulation

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