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https://www.readbyqxmd.com/read/27918290/nacre-mimetic-bulk-lamellar-composites-reinforced-with-high-aspect-ratio-glass-flakes
#1
Selen N Gurbuz Guner, Arcan F Dericioglu
Nacre-mimetic epoxy matrix composites reinforced with readily available micron-sized high aspect ratio C-glass flakes were fabricated by a relatively simple, single-step, scalable, time, cost and man-power effective processing strategy: hot-press assisted slip casting (HASC). HASC enables the fabrication of preferentially oriented two-dimensional inorganic reinforcement-polymer matrix bulk lamellar composites with a micro-scale structure resembling the brick-and-mortar architecture of nacre. By applying the micro-scale design guideline found in nacre and optimizing the relative volume fractions of the reinforcement and the matrix as well as by anchoring the brick-and-mortar architecture, and tailoring the interface between reinforcements and the matrix via silane coupling agents, strong, stiff and tough bio-inspired nacre-mimetic bulk composites were fabricated...
December 5, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27917703/principles-of-the-kenzan-method-for-robotic-cell-spheroid-based-3d-bioprinting
#2
Nicanor I Moldovan, Narutoshi Hibino, Koichi Nakayama
Bioprinting is a technology with the prospect to change the way many diseases are treated, by replacing the damaged tissues with live, de novo created bio-similar constructs. However, after more than a decade of incubation and many proofs-of-concept, the field is still in its infancy. The current stagnation is the consequence of its early success: the first bioprinters, and most of those which followed, were modified versions of the 3D printers used in additive manufacturing, redesigned for layer-by-layer dispersion of biomaterials...
December 4, 2016: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27914339/burstable-nanostructured-micro-raspberries-towards-redispersible-nanoparticles-from-dry-powders
#3
Claudia Stauch, Thomas Ballweg, Werner Stracke, Robert Luxenhofer, Karl Mandel
Despite immense progress in nanoscience and technology, one of the yet unsolved challenges is the redispersion of nanoparticles from dry powders back to the individual, primary particles. Herein, an easy to handle powder consisting of nanostructured micron sized raspberry-like particles is presented. These nanostructured micro-raspberries are composed of individual nanoparticles which are equipped with molecules that introduce a separating effect or "spring" functionality. Thereby, a powder system is obtained that allows for an easy and complete redispersibility of the agglomerates down to the level of individual nanoparticles in solvents and polymers...
November 17, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27913902/a-new-multiscale-micromechanical-model-of-vertebral-trabecular-bones
#4
Rami Haj-Ali, Eyass Massarwa, Jacob Aboudi, Fabio Galbusera, Uwe Wolfram, Hans-Joachim Wilke
A new three-dimensional (3D) multiscale micromechanical model has been suggested as adept at predicting the overall linear anisotropic mechanical properties of a vertebral trabecular bone (VTB) highly porous microstructure. A nested 3D modeling analysis framework spanning the multiscale nature of the VTB is presented herein. This hierarchical analysis framework employs the following micromechanical methods: the 3D parametric high-fidelity generalized method of cells (HFGMC) as well as the 3D sublaminate model...
December 2, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27912913/intravitreal-therapies-for-non-neovascular-age-related-macular-degeneration-with-intraretinal-or-subretinal-fluid
#5
M Cuesta-Lasso, A Vieira-Barros, R Dolz-Marco, M J Roig-Revert, J Badal, L Amselem, M Díaz-Llopis, R Gallego-Pinazo
OBJECTIVE: To evaluate the efficacy of intravitreal therapies in cases of atrophic age-related macular degeneration (AMD) with subretinal or intraretinal fluid. METHODS: A retrospective review was made of the clinical charts of patients diagnosed with atrophic AMD with subretinal or intraretinal fluid. Fundus photographs and spectral-domain optical coherence tomography images were examined, and an analysis was made on the presence of fluid and its density. Neovascularisation was ruled out by fluorescein and/or indocyanine green angiography...
November 29, 2016: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/27910853/holographic-free-electron-light-source
#6
Guanhai Li, Brendan P Clarke, Jin-Kyu So, Kevin F MacDonald, Nikolay I Zheludev
Recent advances in the physics and technology of light generation via free-electron proximity and impact interactions with nanostructures (gratings, photonic crystals, nano-undulators, metamaterials and antenna arrays) have enabled the development of nanoscale-resolution techniques for such applications as mapping plasmons, studying nanoparticle structural transformations and characterizing luminescent materials (including time-resolved measurements). Here, we introduce a universal approach allowing generation of light with prescribed wavelength, direction, divergence and topological charge via point-excitation of holographic plasmonic metasurfaces...
December 2, 2016: Nature Communications
https://www.readbyqxmd.com/read/27910631/a-simple-approach-to-spectrally-resolved-fluorescence-and-bright-field-microscopy-over-select-regions-of-interest
#7
Peter D Dahlberg, Christopher T Boughter, Nabil F Faruk, Lu Hong, Young Hoon Koh, Matthew A Reyer, Alon Shaiber, Aiman Sherani, Jiacheng Zhang, Justin E Jureller, Adam T Hammond
A standard wide field inverted microscope was converted to a spatially selective spectrally resolved microscope through the addition of a polarizing beam splitter, a pair of polarizers, an amplitude-mode liquid crystal-spatial light modulator, and a USB spectrometer. The instrument is capable of simultaneously imaging and acquiring spectra over user defined regions of interest. The microscope can also be operated in a bright-field mode to acquire absorption spectra of micron scale objects. The utility of the instrument is demonstrated on three different samples...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910495/cross-calibration-of-fuji-tr-image-plate-and-rar-2492-x-ray-film-to-determine-the-response-of-a-ditabis-super-micron-image-plate-scanner
#8
G Dunham, E C Harding, G P Loisel, P W Lake, L B Nielsen-Weber
Fuji TR image plate is frequently used as a replacement detector medium for x-ray imaging and spectroscopy diagnostics at NIF, Omega, and Z facilities. However, the familiar Fuji BAS line of image plate scanners is no longer supported by the industry, and so a replacement scanning system is needed. While the General Electric Typhoon line of scanners could replace the Fuji systems, the shift away from photo stimulated luminescence units to 16-bit grayscale Tag Image File Format (TIFF) leaves a discontinuity when comparing data collected from both systems...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910435/design-of-an-extreme-ultraviolet-spectrometer-suite-to-characterize-rapidly-heated-solid-matter
#9
S T Ivancic, C R Stillman, D Nelson, I A Begishev, C Mileham, P M Nilson, D H Froula
An ultrafast streaked extreme-ultraviolet (XUV) spectrometer (5-20 nm) was developed to measure the temperature dynamics in rapidly heated samples. Rapid heating makes it possible to create exotic states of matter that can be probed during their inertial confinement time-tens of picoseconds in the case of micron-sized targets. In contrast to other forms of pyrometry, where the temperature is inferred from bulk x-ray emission, XUV emission is restricted to the sample surface, allowing for a temperature measurement at the material-vacuum interface...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910321/development-of-a-cryogenic-hydrogen-microjet-for-high-intensity-high-repetition-rate-experiments
#10
J B Kim, S Göde, S H Glenzer
The advent of high-intensity, high-repetition-rate lasers has led to the need for replenishing targets of interest for high energy density sciences. We describe the design and characterization of a cryogenic microjet source, which can deliver a continuous stream of liquid hydrogen with a diameter of a few microns. The jet has been imaged at 1 μm resolution by shadowgraphy with a short pulse laser. The pointing stability has been measured at well below a mrad, for a stable free-standing filament of solid-density hydrogen...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909129/metallosis-following-implantation-of-magnetically-controlled-growing-rods-in-the-treatment-of-scoliosis-a-case-series
#11
K H Teoh, C von Ruhland, S L Evans, S H James, A Jones, J Howes, P R Davies, S Ahuja
AIMS: We present a case series of five patients who had revision surgery following magnetic controlled growing rods (MGCR) for early onset scoliosis. Metallosis was found during revision in four out of five patients and we postulated a mechanism for rod failure based on retrieval analysis. PATIENTS AND METHODS: Retrieval analysis was performed on the seven explanted rods. The mean duration of MCGR from implantation to revision was 35 months (17 to 46). The mean age at revision was 12 years (7 to 15; four boys, one girl)...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27906376/spin-hall-effect-of-transmitted-light-in-a-three-layer-waveguide-with-lossy-epsilon-near-zero-metamaterial
#12
Tingting Tang, Jie Li, Yanfen Zhang, Chaoyang Li, Li Luo
We study spin Hall effect (SHE) of transmitted light in a three-layer waveguide with epsilon-near-zero (ENZ) metamaterial. As the increased loss of anisotropic ENZ metamaterial brings decreased propagation loss for oblique incidence, the transmission of incident light is enhanced which induces a different distribution of transverse shift peaks. Based on simulation results, the influences of ENZ permittivity components and thickness as well as gold layer thickness on transverse shift of left-circularly polarized light in ENZ/Au/ENZ waveguide are analyzed...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906282/post-print-uv-curing-method-for-improving-the-mechanical-properties-of-prototypes-derived-from-two-photon-lithography
#13
James S Oakdale, Jianchao Ye, William L Smith, Juergen Biener
Two photon polymerization (TPP) is a precise, reliable, and increasingly popular technique for rapid prototyping of micro-scale parts with sub-micron resolution. The materials of choice underlying this process are predominately acrylic resins cross-linked via free-radical polymerization. Due to the nature of the printing process, the derived parts are only partially cured and the corresponding mechanical properties, i.e. modulus and ultimate strength, are lower than if the material were cross-linked to the maximum extent...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906227/high-performance-humidity-sensor-based-on-a-polyvinyl-alcohol-coated-photonic-crystal-cavity
#14
Chenyang Zhao, Qingchen Yuan, Liang Fang, Xuetao Gan, Jianlin Zhao
We demonstrate a high-performance relative humidity (RH) sensor by coating a photonic crystal (PC) cavity with polyvinyl alcohol (PVA). Because a PC cavity's evanescent field strongly interacts with the coated moisture-sensitive PVA film, the resonant wavelength is modified remarkably under varying RH levels ranging from 30% to 90%. In a PC cavity coated with a 720 nm thick PVA, the sensor exhibits a linear spectrum sensitivity exceeding 129 pm/%RH over 40-90%RH, and the power interrogation presents a high sensitivity as 0...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27900987/effect-of-half-dose-and-standard-dose-conjugated-equine-estrogens-combined-with-natural-progesterone-or-dydrogesterone-on-components-of-metabolic-syndrome-in-healthy-postmenopausal-women-a-randomized-controlled-trial
#15
Wei Xue, Yan Deng, Yan-Fang Wang, Ai-Jun Sun
BACKGROUND: Menopausal hormone therapy (MHT) has been proven to have beneficial effects on several components of metabolic syndrome. However, the effects vary according to different regimens, dosages, and duration of MHT. The aim of the study was to evaluate the effect of standard-dose 0.625 mg conjugated equine estrogen (CEE) and half-dose 0.3 mg CEE daily with different progestogens in a continuous sequential regimen on postmenopausal metabolic parameters in generally healthy postmenopausal women...
2016: Chinese Medical Journal
https://www.readbyqxmd.com/read/27900377/microfluidic-technologies-in-cell-isolation-and-analysis-for-biomedical-applications
#16
Jing Wu, Qiushui Chen, Jin-Ming Lin
Efficient platforms for cell isolation and analysis play an important role in applied and fundamental biomedical studies. As cells commonly have a size of around 10 microns, conventional handling approaches at a large scale are still challenged in precise control and efficient recognition of cells for further performance of isolation and analysis. Microfluidic technologies have become more prominent in highly efficient cell isolation for circulating tumor cells (CTCs) detection, single-cell analysis and stem cell separation, since microfabricated devices allow for the spatial and temporal control of complex biochemistries and geometries by matching cell morphology and hydrodynamic traps in a fluidic network, as well as enabling specific recognition with functional biomolecules in the microchannels...
November 30, 2016: Analyst
https://www.readbyqxmd.com/read/27898104/towards-high-capacity-li-ion-batteries-based-on-silicon-graphene-composite-anodes-and-sub-micron-v-doped-lifepo4-cathodes
#17
M J Loveridge, M J Lain, I D Johnson, A Roberts, S D Beattie, R Dashwood, J A Darr, R Bhagat
Lithium iron phosphate, LiFePO4 (LFP) has demonstrated promising performance as a cathode material in lithium ion batteries (LIBs), by overcoming the rate performance issues from limited electronic conductivity. Nano-sized vanadium-doped LFP (V-LFP) was synthesized using a continuous hydrothermal process using supercritical water as a reagent. The atomic % of dopant determined the particle shape. 5 at. % gave mixed plate and rod-like morphology, showing optimal electrochemical performance and good rate properties vs...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27898089/polarisation-independent-silicon-on-insulator-slot-waveguides
#18
Valerian Hongjie Chen, Jun Rong Ong, Ching Eng Png
The minimisation of birefringence, or polarisation mode dispersion, is vital for simplifying and miniaturising photonic components. In this work, we present a systematic study of the slot waveguide geometries required for having zero birefringence (ZB). We show that the rail widths required for ZB are more strongly dependent on the height of the waveguide than on the slot separation. After which, we demonstrate that the ZB geometry is significantly affected by the slanting of the waveguide walls. This paper proceeds to show that within the range studied, one can fix the height, slot, slant angle, and bend radius, and still achieve ZB by varying the widths of both of the rails...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896590/improvement-in-thermal-stability-of-sucralose-by-%C3%AE-cyclodextrin-metal-organic-frameworks
#19
Nana Lv, Tao Guo, Botao Liu, Caifen Wang, Vikaramjeet Singh, Xiaonan Xu, Xue Li, Dawei Chen, Ruxandra Gref, Jiwen Zhang
PURPOSE: To explain thermal stability enhancement of an organic compound, sucralose, with cyclodextrin based metal organic frameworks. METHODS: Micron and nanometer sized basic CD-MOFs were successfully synthesized by a modified vapor diffusion method and further neutralized with glacial acetic acid. Sucralose was loaded into CD-MOFs by incubating CD-MOFs with sucralose ethanol solutions. Thermal stabilities of sucralose-loaded basic CD-MOFs and neutralized CD-MOFs were investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and high performance liquid chromatography with evaporative light-scattering detection (HPLC-ELSD)...
November 28, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27896356/vapochromic-features-of-new-luminogens-based-on-julolidine-containing-styrene-copolymers
#20
Giuseppe Iasilli, Fabio Martini, Pierpaolo Minei, Giacomo Ruggeri, Andrea Pucci
We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized with cyanovinyl-julolidine moieties of different compositions were prepared, (P(STY-co-JCAEM)(m) with m = 0.06-0.61). The sensing performance of the spin-coated copolymer films demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and a favourable interaction with the polymer matrix, such as Et2O and CH2Cl2...
November 29, 2016: Faraday Discussions
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