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https://www.readbyqxmd.com/read/28221749/high-interlaminar-shear-strength-enhancement-of-carbon-fiber-epoxy-composite-through-fiber-and-matrix-anchored-carbon-nanotube-networks
#1
Yilei Wang, Suresh Kumar Raman Pillai, Jianfei Che, Mary B Chan-Park
To improve the interlaminar shear strength (ILSS) of carbon fiber reinforced epoxy composite, networks of multi-walled carbon nanotubes (MWNTs) were grown on micron-sized carbon fibers and single-walled carbon nanotubes (SWNTs) were dispersed into the epoxy matrix so that these two types of carbon nanotubes entangle at the carbon fiber (CF)/epoxy matrix interface. The MWNTs on the CF fiber (CF-MWNTs) were grown by chemical vapor deposition (CVD) while the single-walled carbon nanotubes (SWNTs) were finely dispersed in the epoxy matrix precursor with the aid of a dispersing agent -- polyimide-graft-bisphenol A diglyceryl acrylate (PI-BDA) copolymer...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28218545/optical-generation-and-detection-of-local-non-equilibrium-phonons-in-suspended-graphene
#2
Sean Sullivan, Ajit Kumar Vallabhaneni, Iskandar Kholmanov, Xiulin Ruan, Jayathi Murthy, Li Shi
The measured frequencies and intensities of different first- and second- order Raman peaks of suspended graphene are used to show that optical phonons and different acoustic phonon polarizations are driven out of local equilibrium inside a sub-micron laser spot. The experimental results are correlated with a first principles-based multiple temperature model to suggest a considerably lower equivalent local temperature of the flexural phonons than those of other phonon polarizations. The finding reveals weak coupling between the flexural modes with hot electrons and optical phonons...
February 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28217788/transfer-printing-gold-nanoparticle-arrays-by-tuning-the-surface-hydrophilicity-of-thermo-responsive-poly-n-isopropylacrylamide-pnipaam
#3
S Khabbaz Abkenar, A Tufani, G Ozaydin Ince, H Kurt, A Turak, C W Ow-Yang
For the transfer of 2-D gold nanoparticle arrays between different substrates, we have developed a new method using thermo-responsive poly-N-isopropylacrylamide (pNIPAAm). By tuning the degree of surface hydrophilicity of pNIPAAm between 5 °C and 50 °C, we demonstrate the transfer of arrays extending over micron-scale areas with preservation of array properties.
February 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28215341/dissection-and-characterization-of-microtubule-bundles-in-the-mitotic-spindle-using-femtosecond-laser-ablation
#4
R Buđa, K Vukušić, I M Tolić
The mitotic spindle is a highly organized and dynamic structure required for segregation of the genetic material into two daughter cells. Although most of the individual players involved in building the spindle have been characterized in vitro, a general understanding of how all of the spindle players act together in vivo is still missing. Hence, in recent years, experiments have focused on introducing mechanical perturbations of the spindle on a micron scale, thereby providing insight into its function and organization, as well as into forces acting in the spindle...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28214438/stepwise-dynamics-of-an-anionic-micellar-film-formation-of-crown-lenses
#5
Jongju Lee, Alex Nikolov, Darsh Wasan
We studied the stepwise thinning of a microscopic circular foam film formed from an anionic micellar solution of sodium dodecyl sulfate (SDS). The foam film formed from the SDS micellar solution thins in a stepwise manner by the formation and expansion of a dark spot(s) of one layer less than the film thickness. During the last stages of film thinning (e.g., a film with one micellar layer), the dark spot expansion occurs via two steps. Initially, a small dark circular spot inside a film of several microns in size is formed, which expands at a constant rate...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213151/automatic-method-for-estimation-of-in-situ-effective-contact-angle-from-x-ray-micro-tomography-images-of-two-phase-flow-in-porous-media
#6
Alessio Scanziani, Kamaljit Singh, Martin J Blunt, Alberto Guadagnini
Multiphase flow in porous media is strongly influenced by the wettability of the system, which affects the arrangement of the interfaces of different phases residing in the pores. We present a method for estimating the effective contact angle, which quantifies the wettability and controls the local capillary pressure within the complex pore space of natural rock samples, based on the physical constraint of constant curvature of the interface between two fluids. This algorithm is able to extract a large number of measurements from a single rock core, resulting in a characteristic distribution of effective in situ contact angle for the system, that is modelled as a truncated Gaussian probability density distribution...
February 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213120/a-cross-validated-cytoarchitectonic-atlas-of-the-human-ventral-visual-stream
#7
M Rosenke, K S Weiner, M A Barnett, K Zilles, K Amunts, R Goebel, K Grill-Spector
The human ventral visual stream consists of several areas considered processing stages essential for perception and recognition. A fundamental microanatomical feature differentiating areas is cytoarchitecture, which refers to the distribution, size, and density of cells across cortical layers. Because cytoarchitectonic structure is measured in 20-micron-thick histological slices of postmortem tissue, it is difficult to assess (a) how anatomically consistent these areas are across brains and (b) how they relate to brain parcellations obtained with prevalent neuroimaging methods, acquired at the millimeter and centimeter scale...
February 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28211882/aflibercept-as-a-second-line-therapy-for-neovascular-age-related-macular-degeneration-in-israel-asli-study
#8
L Tiosano, O Segal, N Mathalone, A Pollack, R Ehrlich, I Klemperer, Y Barak, I Moroz, I Chowers, M Goldstein
PurposeThe purpose of this study is to evaluate an early switch to aflibecept in eyes with neovascular age-related macular degeneration (nvAMD) showing partial or lack of response for initial therapy with bevacizumab.MethodsThe Aflibercept as a Second Line Therapy for Neovascular Age Related Macular Degeneration in Israel (ASLI) was a prospective, multicenter, single-arm clinical trial. Eyes with nvAMD having incomplete response to 3-9 prior bevacizumab injections were recruited. Three monthly intravitreal aflibercept (2 mg) injections were administered, followed by two bi-monthly injections and a final examination at week 28...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28211296/recommendations-for-the-medical-management-of-chronic-venous-disease-the-role-of-micronized-purified-flavanoid-fraction-mpff
#9
Ronald Bush, Anthony Comerota, Mark Meissner, Joseph D Raffetto, Steven R Hahn, Katherine Freeman
Scope A systematic review of the clinical literature concerning medical management of chronic venous disease with the venoactive therapy Micronized Purified Flavonoid Fraction was conducted in addition to an investigation of the hemodynamics and mechanism of chronic venous disease. Methods The systematic review of the literature focused on the use of Micronized Purified Flavonoid Fraction (diosmin) which has recently become available in the US, in the management of chronic venous disease. The primary goal was to assess the level of evidence of the role of Micronized Purified Flavonoid Fraction in the healing of ulcers, and secondarily on the improvement of the symptoms of chronic venous disease such as edema...
April 2017: Phlebology
https://www.readbyqxmd.com/read/28208585/geometric-shape-induced-small-change-of-seebeck-coefficient-in-bulky-metallic-wires
#10
Gang Li, Xiaohui Su, Fan Yang, Xiaoye Huo, Gengmin Zhang, Shengyong Xu
In this paper, we report the results of slight changes in the thermopower of long W, Mo, Zn, Cu, brass, and Ti wires, that resulted from changes in the wire's diameter or cross-sectional area. The samples used in the tests had a round shape with a diameter that ranged from tens of micron to 2 mm, which was much larger than the corresponding mean free paths of these materials. Nevertheless, a small change in thermopower, at the order of 1-10 nV/K, was repeatedly observed when the wire diameter was changed, or when the cross-sectional area of the wire was altered by mechanical methods, such as grinding or splitting...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28208112/systematic-mechanical-evaluation-of-electrospun-gelatin-meshes
#11
Annabel L Butcher, Ching Theng Koh, Michelle L Oyen
Electrospinning is a simple and efficient process for producing sub-micron fibres. However, the process has many variables, and their effects on the non-woven mesh of fibres is complex. In particular, the effects on the mechanical properties of the fibre meshes are poorly understood. This paper conducts a parametric study, where the concentration and bloom strength of the gelatin solutions are varied, while all electrospinning process parameters are held constant. The effects on the fibrous meshes are monitored using scanning electron microscopy and mechanical testing under uniaxial tension...
February 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28207564/reply-to-mechanical-micronization-of-lipoaspirates-squeeze-and-emulsification-techniques
#12
Joris A van Dongen, Hieronymus P Stevens, Martin C Harmsen, Berend van der Lei
No abstract text is available yet for this article.
February 14, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28206732/clinical-efficacy-and-safety-of-a-new-once-daily-1000-mg-suspension-versus-twice-daily-500-mg-tablets-of-micronized-purified-flavonoid-fraction-in-patients-with-symptomatic-chronic-venous-disorders-a-randomized-controlled-trial
#13
Patrick Carpentier, Debora Karetova, Harunarashid Hanafiah, Elisabeth Enriquez-Vega, Andrej Dzupina, Miso Sabovic, Lourdes Reina Gutierrez, Somboom Subwongcharoen, Hasan Tüzün, Arnaud Maggioli
BACKGROUND: Chronic venous disorders (CVD) is estimated to affect 30% to 50% of women and 10% to 30% of men. The most widely prescribed treatment for CVD worldwide is micronized purified flavonoid fraction 500 mg (MPFF). The aim of this clinical trial was to develop a new once daily 1000 mg oral suspension of MPFF. METHODS: In an international, randomized, double-blind, parallel-group study, symptomatic individuals classified CEAP C0s to C4s were randomized in either treatment arm and treated for 8 weeks...
February 15, 2017: International Angiology: a Journal of the International Union of Angiology
https://www.readbyqxmd.com/read/28205348/photochemical-eradication-of-methicillin-resistant-staphylococcus-aureus-by-blue-light-activation-of-riboflavin
#14
Karim Makdoumi, Ray Goodrich, Anders Bäckman
PURPOSE: To compare elimination of methicillin-resistant Staphylococcus aureus (MRSA) by exposure of blue light alone and with riboflavin. METHODS: A reference strain of MRSA was cultured and diluted in PBS with and without riboflavin (0.01%). Fifteen microlitre was added on a microscope slide, creating a fluid layer with a thickness of around 400 microns. Both of the bacterial suspensions were exposed to blue light, and the effect between exposure with and without riboflavin was compared...
February 15, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28203186/real-life-iluvien-fluocinolone-acetonide-case-study-rapid-drying-of-the-macula-and-improved-vision-within-2-years-after-therapy-initiation
#15
Hibba Quhill, Fahd Quhill
IMPORTANCE: A case showing sustained structural and functional responses 2 years after a single treatment with ILUVIEN (0.2 µg/day fluocinolone acetonide, FAc) despite suboptimal responses to ranibizumab. OBSERVATIONS: A 68-year-old female patient with diabetic macular oedema (DME) from type 2 diabetes mellitus was first diagnosed in October 2010 and had a baseline visual acuity (VA) of 46 Early Treatment Diabetic Retinopathy Study (ETDRS) letters in the left eye...
September 2016: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28199222/liquid-crystals-in-micron-scale-droplets-shells-and-fibers
#16
Martin Urbanski, Catherine G Reyes, JungHyun Noh, Anshul Sharma, Yong Geng, Venkata Subba Rao Jampani, Jan P F Lagerwall
The extraordinary responsiveness and large diversity of self-assembled structures of liquid crystals are well documented and they have been extensively used in devices like displays. For long, this application route strongly influenced academic research, which frequently focused on the performance of liquid crystals in display-like geometries, typically between flat, rigid substrates of glass or similar solids. Today a new trend is clearly visible, where liquid crystals confined within curved, often soft and flexible, interfaces are in focus...
February 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28199055/photo-induced-click-chemistry-for-dna-surface-structuring-via-direct-laser-writing
#17
Ljiljana Fruk, Antonina Kerbs, Patrick Mueller, Michael Kaupp, Ishtiaq Ahmed, Alexander S Quick, Doris Abt, Martin Wegener, Christof M Niemeyer, Christopher Barner-Kowollik
Oligonucleotides containing photo-caged dienes were prepared and shown to react quantitatively in a light-induced Diels-Alder cycloaddition with functional maleimides in aqueous solution within minutes. Due to its high yield and fast rate, the reaction was exploited for DNA surface patterning with sub-micrometer resolution employing direct laser writing (DLW). Functional DNA arrays were written via direct laser writing (DLW) in variable patterns, which were further encoded with fluorophores and proteins through DNA directed immobilisation...
February 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28198362/covalent-assembly-of-nanoparticles-as-a-peptidase-degradable-platform-for-molecular-mri
#18
Francisco Perez-Balderas, Sander I van Kasteren, Alaa A A Aljabali, Kim Wals, Sébastien Serres, Andrew Jefferson, Manuel Sarmiento Soto, Alexandre A Khrapitchev, James R Larkin, Claire Bristow, Seung Seo Lee, Guillaume Bort, Filippo De Simone, Sandra J Campbell, Robin P Choudhury, Daniel C Anthony, Nicola R Sibson, Benjamin G Davis
Ligand-conjugated microparticles of iron oxide (MPIO) have the potential to provide high sensitivity contrast for molecular magnetic resonance imaging (MRI). However, the accumulation and persistence of non-biodegradable micron-sized particles in liver and spleen precludes their clinical use and limits the translational potential of MPIO-based contrast agents. Here we show that ligand-targeted MPIO derived from multiple iron oxide nanoparticles may be coupled covalently through peptide linkers that are designed to be cleaved by intracellular macrophage proteases...
February 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28197601/active-droplet-sorting-in-microfluidics-a-review
#19
REVIEW
Heng-Dong Xi, Hao Zheng, Wei Guo, Alfonso M Gañán-Calvo, Ye Ai, Chia-Wen Tsao, Jun Zhou, Weihua Li, Yanyi Huang, Nam-Trung Nguyen, Say Hwa Tan
The ability to manipulate and sort droplets is a fundamental issue in droplet-based microfluidics. Various lab-on-a-chip applications can only be realized if droplets are systematically categorized and sorted. These micron-sized droplets act as ideal reactors which compartmentalize different biological and chemical reagents. Array processing of these droplets hinges on the competence of the sorting and integration into the fluidic system. Recent technological advances only allow droplets to be actively sorted at the rate of kilohertz or less...
February 15, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28196769/nanoparticles-of-wc-co-wc-co-and-cu-of-relevance-for-traffic-wear-particles-particle-stability-and-reactivity-in-synthetic-surface-water-and-influence-of-humic-matter
#20
Yolanda S Hedberg, Jonas F Hedberg, Sara Isaksson, Nanxuan Mei, Eva Blomberg, Susanna Wold, Inger Odnevall Wallinder
Studded tyres made of tungsten carbide cobalt (WC-Co) are in the Northern countries commonly used during the winter time. Tungsten (W)-containing nano- and micron-sized particles have been detected close to busy roads in several European countries. Other typical traffic wear particles consist of copper (Cu). The aims of this study were to investigate particle stability and transformation/dissolution properties of nanoparticles (NPs) of WC-Co compared with NPs of tungsten carbide (WC), cobalt (Co), and Cu. Their physicochemical characteristics (primarily surface oxide and charge) are compared with their extent of sedimentation and metal release in synthetic surface water (SW) with and without two different model organic molecules, 2,3- and 3,4-dihydroxybenzoic acid (DHBA) mimicking certain sorption sites of humic substances, for time periods up to 22 days...
February 11, 2017: Environmental Pollution
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