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Osteogenesis of MC3T3 Preosteoblasts on 3D Bioactive Peptide Modified Nano-Macroporous Bioactive Glass Scaffolds

Journal of Biomaterials and Nanobiotechnology 2015年第3期6卷 146-159页

作者： Colin Przybylowski Mohamed Ammar Courtney LeBlon Sabrina S. Jedlicka Integrated Degree in Engineering Arts & Sciences (IDEAS) Program Lehigh University Bethlehem PA USA Bioengineering Program Lehigh University Bethlehem PA USA Department of Materials Science & Engineering Lehigh University Bethlehem PA USA Department of Mechanical Engineering & Mechanics Lehigh University Bethlehem PA USA Center for Advanced Materials & Nanotechnology Lehigh University Bethlehem PA USA

Biointerface design that targets osteogenesis is a growing area of research with significant implications in biomedicine. materials known to either support or stimulate osteogenesis are composed of a biomimetic ceramic material, such as bioactive glass. Bioactive glass is osteoproductive, and the potential for osteoproductivity can be enhanced by the addition of proteins or other additives designed to alter functionality. In addition, soluble growth factors are often added to osteogenic culture on bioactive glasses, further intensifying the effects of the material. In this paper, synthetic peptide combinations, covalently bound to a three-dimensional bioactive glass network, are used to mimic the effects of the whole fibronectin and bone morphogenetic proteins (BMP) 2 and 9. Peptide-silanes possessing critical binding sequences from each of these proteins are synthesized and used to decorate the surface of three-dimensional (3D) nano-macroporous bioactive glass. MC3T3 preosteoblast cells are then assessed for differentiation on the materials in the absence of soluble differentiation cues. MC3T3 preosteoblasts undergo enhanced differentiation on the peptide-silane samples over the standard nano-macroporous bioactive glass, and the differentiation capacity of the cells exposes only to peptide-silane surfaces approaches that of cells grown in chemical differentiation induction media.

关键词： Bioactive Glass Bioactive Peptide MC3T3 Osteogenesis

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A microscopy study of Multiwall Carbon Nanotubes (MWCNTs)/BaTiO3

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Microscopy and Microanalysis 2015年第S6期21卷 90-91页

作者： Mahajan, A Costa, P M Kukovecz, Á Vilarinho, P M Department of Materials and Ceramic Engineering CICECO University of Aveiro 3810-193 Aveiro Portugal Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia Department of Applied and Environmental Chemistry Faculty of Sciences University of Szeged H-6720 Szeged Hungary

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Best-case performance of quantum annealers on native spin-glass benchmarks: How chaos can affect success probabilities

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Physical Review A 2016年第1期93卷 012317-012317页

作者： Zheng Zhu Andrew J. Ochoa Stefan Schnabel Firas Hamze Helmut G. Katzgraber Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA Institut für Theoretische Physik and Centre for Theoretical Sciences (NTZ) Universität Leipzig Postfach 100920 D-04009 Leipzig Germany D-Wave Systems Inc. 3033 Beta Avenue Burnaby British Columbia Canada V5G 4M9 Materials Science and Engineering Program Texas A&M University College Station Texas 77843 USA Santa Fe Institute 1399 Hyde Park Road Santa Fe New Mexico 87501 USA

Recent tests performed on the D-Wave Two quantum annealer have revealed no clear evidence of speedup over conventional silicon-based technologies. Here we present results from classical parallel-tempering Monte Carlo simulations combined with isoenergetic cluster moves of the archetypal benchmark problem—an Ising spin glass—on the native chip topology. Using realistic uncorrelated noise models for the D-Wave Two quantum annealer, we study the best-case resilience, i.e., the probability that the ground-state configuration is not affected by random fields and random-bond fluctuations found on the chip. We thus compute classical upper-bound success probabilities for different types of disorder used in the benchmarks and predict that an increase in the number of qubits will require either error correction schemes or a drastic reduction of the intrinsic noise found in these devices. We restrict this study to the exact ground state, however, the approach can be trivially extended to the inclusion of excited states if the success metric is relaxed. We outline strategies to develop robust, as well as hard benchmarks for quantum annealing devices, as well as any other (black box) computing paradigm affected by noise.

关键词： Quantum algorithms Quantum chaos Quantum simulation

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Anomalous bulk modulus in vanadate spinels

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Physical Review B 2016年第16期94卷 165159-165159页

作者： Z.-Y. Li X. Li J.-G. Cheng L. G. Marshall X.-Y. Li A. M. dos Santos W.-G. Yang J. J. Wu J.-F. Lin G. Henkelman T. Okada Y. Uwatoko H. B. Cao H. D. Zhou J. B. Goodenough J.-S. Zhou Materials Science and Engineering Program University of Texas at Austin Austin Texas 78712 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Institute for Solid State Physics University of Tokyo 5-1-5 Kashiwanoha Chiba 277-8581 Japan Quantum Condensed Matter Division Oak Ridge National Laboratory Tennessee 37831 USA High Pressure Synergetic Consortium (HPSynC) and High Pressure Collaborative Access Team (HPCAT) Geophysical Laboratory Carnegie Institute of Washington Argonne Illinois 60439 USA Center for High Pressure Science and Technology Advanced Research (HPSTAR) Shanghai 201900 China Department of Geological Sciences Jackson School of Geosciences University of Texas at Austin Austin Texas 78712 USA Department of Chemistry University of Texas at Austin Austin Texas 78712 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37966 USA

All single-valent oxide spinels are insulators. The relatively small activation energy in the temperature dependence of resistivity in vanadate spinels led to the speculation that the spinels are near the crossover from localized to itinerant electronic behavior, and the crossover could be achieved under pressure. We have performed a number of experiments and calculations aimed at obtaining information regarding structural changes under high pressure for the whole series of vanadate spinels, as well as transport and magnetic properties under pressure for MgV2O4. We have also studied the crystal structure under pressure of wide-gap insulators ACr2O4 (A=Mg, Mn, Fe, Zn) for comparison. Moreover, the relationship between the bulk modulus and the cell volume of AV2O4 (A=Mg, Mn, Fe, Co, Zn) has been simulated by a density functional theory calculation. The proximity of AV2O4 spinels to the electronic state crossover under high pressure has been tested by three criteria: (1) a predicted critical V-V bond length, (2) the observation of a sign change in the pressure dependence of Néel temperature, and (3) measurement of a reduced bulk modulus. The obtained results indicate that, although the crossover from localized to itinerant π bonding V-3d electrons in the AV2O4 spinels is approached by reducing under pressure the V-V separation R, the critical separation Rc is not reached by 20 GPa in CoV2O4, which has the smallest V-V separation in the AV2O4 (A=Mg, Mn, Fe, Co, Zn) spinels.

关键词： Antiferromagnetism Insulators Magnetic phase transitions Metals

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Dielectric Metasurface Analogue of Electromagnetically Induced Transparency

Dielectric Metasurface Analogue of Electromagnetically Induc...

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Conference on Lasers and Electro-Optics

作者： Yuanmu Yang Ivan. I. Kravchenko Daryl. P. Briggs Jason Valentine Interdisciplinary Materials Science Program Vanderbilt University Nashville Tennessee USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee USA Department of Mechanical Engineering Vanderbilt University Nashville Tennessee USA

We present an experimental demonstration of a metasurface analogue of electromagnetically induced transparency based on silicon instead of lossy plasmonic metal, therefore achieved a record-high quality factor of 483 ... 详细信息

关键词： Plasmons Q-factor Optical sensors Optical ring resonators Silicon Optical losses

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Inside Cover: Nonplanar Butterfly-Shaped π-Expanded Pyrrolopyrroles (Chem. Eur. J. 46/2016)

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Chemistry – A European Journal 2016年第46期22卷 16326-16326页

作者： Maciej Krzeszewski Takuya Kodama Eli M. Espinoza Prof. Dr. Valentine I. Vullev Prof. Dr. Takashi Kubo Prof. Dr. Daniel T. Gryko Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44–52 01-224 Warsaw Poland Department of Bioengineering Department of Biochemistry Department of Chemistry and Materials Science and Engineering Program University of California Riverside California 92521 USA Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan

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Nanotechnology Solutions for Global Water Challenges

Nanotechnology Solutions for Global Water Challenges

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作者： McGuinness, Niall B. Garvey, Mary Whelan, Aine John, Honey Zhao, Chun Zhang, Geshan Dionysiou, Dionysios D. Byrne, J. Anthony Pillai, Suresh C. Nanotechnology Research Group Department of Environmental Sciences Institute of Technology Sligo Sligo Ireland Centre for Precision Engineering Materials and Manufacturing Research Institute of Technology Sligo Sligo Ireland School of Chemical and Pharmaceutical Sciences Dublin Institute of Technology Kevin St. Dublin 8 Ireland Department of Chemistry Indian Institute of Space Science and Technology Thiruvananthapuram Kerala695547 India Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment Ministry of Education Chongqing University Chongqing400045 China Environmental Engineering and Science Program University of Cincinnati CincinnatiOH45221-0012 United States Nanotechnology and Integrated BioEngineering Centre School of Engineering University of Ulster Newtownabbey Northern IrelandBT37 0QB United Kingdom

ISBN: (纸本)9780841231061

The lack of clean and safe drinking water is responsible for more deaths than war, terrorism and weapons of mass destruction combined. This suggests contaminated water poses a significant threat to human health and welfare. In addition, standard water disinfection approaches such as sedimentation, filtration, and chemical or biological degradation are not fully capable of destroying emerging contaminants (e.g. pesticides, pharmaceutical waste products) or certain types of bacteria (e.g. Cryptosporidium parvum). Nanomaterials and nanotechnology based devices can potentially be employed to solve the challenges posed by various contaminants and microorganisms. Nanomaterials of different shapes, namely nanoparticles, nanotubes, nanowires and fibers have the ability to function as adsorbents and catalysts. These possess an expansive array of physicochemical characteristics deeming them highly attractive for the production of reactive media for water membrane filtration, a vital step in the production of potable water. As a result of their exceptional adsorptive capacity for water contaminants, graphene based nanomaterials have emerged as an area of significant importance in the area of membrane filtration and water treatment. In addition, Advanced Oxidation Processes (AOPs) together with or without sources of light irradiation or ultrasound, have been found to be promising alternatives for water treatment at near ambient temperature and pressure. Furthermore, the uses of visible light active titanium dioxide photocatalysts and photo-Fenton processes have shown significant potential for water purification. A wide variety of nanomaterial based sensors, for the monitoring of water quality, have also been reviewed in detail. In conclusion, the rapid and continued growth in the area of nanomaterial based devices offers significant hope for addressing future water quality challenges. © 2015 American Chemical Society.

关键词： Nanostructured materials

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Needle-implantable, wireless biosensor for continuous glucose monitoring 12

Needle-implantable, wireless biosensor for continuous glucos...

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12th IEEE International Conference on Wearable and Implantable Body Sensor Networks, BSN 2015

作者： Vaddiraju, Santhisagar Kastellorizios, Michail Legassey, Allen Burgess, Diane Jain, Faquir Papadimitrakopoulos, Fotios Biorasis Inc. Technology Incubation Program University of Connecticut StorrsCT06268 United States Nanomaterials Optoelectronics Laboratory Institute of Materials Science University of Connecticut StorrsCT06269 United States Electrical and Computer Engineering University of Connecticut StorrsCT06269 United States Department of Pharmaceutical Sciences University of Connecticut StorrsCT06269 United States Department of Chemistry University of Connecticut StorrsCT06269 United States

ISBN: (纸本)9781467372015

Unlike non-invasive and minimally invasive continuous monitoring of glucose (CGM) devices, invasive devices require less rigorous calibration and exhibit smaller subject-to-subject variability. Biorasis, Inc. and the University of Connecticut are developing a totally implantable CGM device. Glucowizzard™ is engineered at the smallest possible footprint (0.5 × 0.5 × 5 mm). This miniaturization is made possible by utilizing light both for powering and wireless communication. In addition, Glucowizzard™ utilizes 'smart' hydrogel coatings intended for localized release of various tissue response modifiers for effective control of negative tissue responses. The use of light-based powering and communication together with advanced microelectronic design rules has allowed the fabrication of truly miniaturized CGM device. The drug delivery coating has enabled substantial reduction of negative tissue responses for up to 1 month in small as well as large animals (rats and minipigs). The functionality of Glucowizzard™ has been demonstrated in vivo in both rats and minipigs. © 2015 IEEE.

关键词： Rats

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Direct observation of symmetry-specific precession in a ferrimagnet

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Physical Review B 2015年第10期92卷 104402-104402页

作者： P. Warnicke E. Stavitski J.-S. Lee A. Yang Z. Chen X. Zuo S. Zohar W. E. Bailey V. G. Harris D. A. Arena Photon Sciences Directorate Brookhaven National Laboratory Upton New York 11973 USA Department of Electrical and Computer Engineering Northeastern University Boston Massachusetts 02115 USA Materials Science Program Department of Applied Physics Columbia University New York New York 10027 USA

Here we demonstrate an experimental observation of GHz-scale spin dynamics resolved to sublattice octahedral (Oh) tetrahedral (Td) sites in a spinel ferrimagnet, in this case a Mn-ferrite thin film. X-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) are used, in combination with multiplet calculations, to uniquely identify the spectral signature from Mn2+ and Fe2+,3+ on Oh and Td lattice sites. With the sample under rf excitation, the spin alignment of the sublattices is tracked with time-resolved XMCD (TR-XMCD). The spin alignment of the sublattices is mostly antiferromagnetic. The phase difference between the Oh Fe2+ [Oh Fe3+] and Td Mn2+ sites is 181.2±3.8∘ [183.3∘±3.7∘] at 150 K and 186.6±2.2∘ [182.0∘±2.2∘] at 300 K. Such direct measurement of the dynamic coupling, exchange stiffness, and damping enabled by TR-XMCD across sublattices will be essential for optimizing the development of future-generation microwave devices.

关键词： OCTAHEDRAL molecules TETRAHEDRAL molecules FERRIMAGNETIC materials X-ray absorption SPECTRUM analysis MAGNETIC circular dichroism LATTICE dynamics MICROWAVE devices

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Electrical properties of lanthanum silicate apatite electrolytes prepared by an innovative chemical route

Electrical properties of lanthanum silicate apatite electrol...

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Symposium on Nanotechnology General Session - 225th ECS Meeting

作者： Macedo, G.L.S. Macedo, D.A. Rajesh, S. Martinelli, A.E. Figueiredo, F.M.L. Marques, F.M.B. Nascimento, R.M. Department of Chemical Engineering UFRN Natal59078-970 Brazil Department of Materials Engineering UFPB João Pessoa58051-900 Brazil Dept. of Materials and Ceramic Eng. CICECO University of Aveiro 3810-193 Portugal Materials Science and Engineering Postgraduate Program UFRN 59078-970 Brazil

ISBN: (纸本)9781607685869

This work reports the synthesis of apatite-type lanthanum silicate powders with nominal composition La10Si6O27 by an innovative chemical route which combines co-precipitation and sol-gel approaches. The herein proposed synthetic procedure is advantageous in reducing energy consumption and processing time, key elements to decrease the total manufacturing cost. The asprepared powder was calcined between 500 and 900 °C. Structure of the calcined powders, characterized by X-ray diffraction (XRD) and Rietveld refinement, indicated the formation of apatite crystalline lanthanum silicate with minor amount of L2O3 at 900 °C. The apatite powder was further analyzed by scanning electron microscopy (SEM). The effect of sintering temperature, ranging from 1400 to 1450 °C, on the electrical properties was investigated by impedance spectroscopy. Electrical measurements were recorded in the 400-800 °C temperature range. The lanthanum silicate electrolyte sintered at 1450 °C exhibited total electrical conductivity (σ700 °C = 2.12 × 10-3 ***-1) comparable with samples from literature prepared by sol-gel and freeze drying methods and sintered at 1500 °C. The results in the present study demonstrate that the co-precipitation method combined with a solgel approach is a promising alternative route to synthesize lanthanum silicate powders. © The Electrochemical Society.

关键词： Powders

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