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https://www.readbyqxmd.com/read/28445861/the-application-of-silicon-sol-gel-technology-to-forensic-blood-substitute-development-investigation-of-the-spreading-dynamics-onto-a-paper-surface
#1
Theresa Stotesbury, Mike Illes, Paul Wilson, Andrew J Vreugdenhil
This work investigates the spreading dynamics of three candidate sol-gel solutions, of ranging viscosities, surface tensions and densities, and compares them with water and two commercial blood substitute products. Droplets were created with different sizes (10 to75μL) and impact velocities (1.4 to 6.0m/s) to strike 176gsm cardstock. Over 2200 droplets were created using the six different fluids and their final dried stain diameter was measured. Droplet spread was plotted using the Scheller and Bousfield correlation and uses effective viscosity as a parameter for non-Newtonian fluids...
April 1, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28445768/polymer-free-electrospun-nanofibers-from-sulfobutyl-ether7-beta-cyclodextrin-sbe7-%C3%AE-cd-inclusion-complex-with-sulfisoxazole-fast-dissolving-and-enhanced-water-solubility-of-sulfisoxazole
#2
Zehra Irem Yildiz, Asli Celebioglu, Tamer Uyar
In this study, our aim was to develop solid drug-cyclodextrin inclusion complex system having nanofibrous morphology in order to have fast-dissolving property and enhanced water-solubility of poorly water-soluble drug. Here, we prepared a highly concentrated aqueous solution of inclusion complex between sulfisoxazole and sulfobutyl ether7-beta-cyclodextrin (SBE7-β-CD, Captisol(®)), and then, without using any polymeric matrix, the electrospinning of sulfisoxazole/SBE7-β-CD-IC nanofibers was performed in order to obtain free-standing and handy nanofibrous web...
April 23, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28445635/synthesis-and-enhanced-corrosion-protection-performance-of-reduced-graphene-oxide-nanosheet-znal-layered-double-hydroxides-composite-film-by-hydrothermal-continuous-flow-method
#3
Xiaohu Luo, Song Yuan, Xinyu Pan, Caixia Zhang, Shuo Du, Yali Liu
Effective prevention of the water, oxygen, and chloride ions held in the hydrotalcite interlayer from diffusing through the layered double hydroxides ( LDH ) layer is crucial importance for its further practical application in the corrosion protection. In this study, a hybrid reduced graphene oxide ( RGO ) nanosheet /Zn2+/Al3+ layered double hydroxides ( RGO/ZnAl-LDH ) composite film with an excellent corrosion protection property on the 6N01 aluminum alloy surface was synthesized by a newly and facile hydrothermal continuous flow method,which can enable direct growth on the substrate...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28445491/how-people-used-ochre-at-rose-cottage-cave-south-africa-sixty-thousand-years-of-evidence-from-the-middle-stone-age
#4
Tammy Hodgskiss, Lyn Wadley
We describe colour, hardness, grain size, geological type and surface modifications of ochre pieces excavated, first by Malan and later by Harper, from the Middle Stone Age (MSA) of Rose Cottage Cave, 96, 000 to 30, 000 years ago. Soft, bright-red shales are abundant, and most ochre has clayey or silty grain sizes. The post-Howiesons Poort layers contain the most ochre pieces, but the Howiesons Poort layers have the highest frequency of ochre per sediment volume. The pre-Howiesons Poort layers have the highest utilization rate...
2017: PloS One
https://www.readbyqxmd.com/read/28445394/spectroscopic-detection-of-glyphosate-in-water-assisted-by-laser-ablated-silver-nanoparticles
#5
Rafael Eleodoro De Góes, Marcia Muller, José Luís Fabris
Glyphosate is one of the most widely used herbicides in the world. Its safety for both human health and aquatic biomes is a subject of wide debate. There are limits to glyphosate's presence in bodies of water, and it is usually detected through complex analytical procedures. In this work, the presence of glyphosate is detected directly through optical interrogation of aqueous solution. For this purpose, silver nanoparticles were produced by pulsed laser ablation in liquids. Limits of detection of 0.9 mg/L and 3...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28445067/photoelectrochemical-degradation-of-organic-compounds-coupled-with-molecular-hydrogen-generation-using-electrochromic-tio2-nanotube-arrays
#6
Min Seok Koo, Kangwoo Cho, Jeyong Yoon, Wonyong Choi
Vertically aligned TiO2 nanotube arrays (TNTs) were prepared by electrochemical anodization, and then cathodically polarized with dark blue coloration for the dual-functional photoelectrochemical water treatment of organic substrates degradation and accompanying H2 generation. The resulting Blue-TNTs (inner diameter: ~40 nm; length: ~9 μm) showed negligible shift in X-ray diffraction pattern compared with the intact TNTs, but the X-ray photoelectron spectra indicated a partial reduction of Ti(4+) to Ti(3+) on the surface...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28445057/experimental-and-numerical-study-of-the-evaporation-of-water-at-low-pressures
#7
Mohammad Amin Kazemi, David S Nobes, Janet A W Elliott
Although evaporation is considered to be a surface phenomenon, the rate of molecular transport across a liquid-vapor boundary is strongly dependent on the coupled fluid dynamics and heat transfer in the bulk fluids. Recent experimental thermocouple measurements of the temperature field near the interface of evaporating water into its vapor have begun to show the role of heat transfer in evaporation. However, the role of fluid dynamics has not been explored sufficiently. Here, we have developed a mathematical model to describe the coupling of the heat, mass, and momentum transfer in the fluids with the transport phenomena at the interface...
April 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28445042/structural-transformation-of-mno2-during-the-oxidation-of-bisphenol-a
#8
Sarah Balgooyen, Peter J Alaimo, Christina K Remucal, Matthew Ginder-Vogel
Bisphenol A (BPA) is an endocrine-disrupting compound widely used in the plastic industry and found in natural waters at concentrations considered harmful for aquatic life. BPA is susceptible to oxidation by Mn(III/IV) oxides, which are commonly found in near-surface environments. Here, we quantify BPA oxidation rates and the formation of its predominant product, 4-hydroxycumyl alcohol (HCA), in tandem with transformation of a synthetic, Mn(III)-rich δ-MnO2. To investigate the effect of Mn oxide structural changes on BPA oxidation rate, twelve sequential additions of 80 μM BPA are performed at pH 7...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28445028/enhanced-electrocatalytic-activity-of-ethanol-oxidation-reaction-on-palladium-silver-nanoparticles-via-removable-surface-ligands
#9
Hucheng Zhang, Yingying Shang, Jing Zhao, Jianji Wang
This work developed a facile colloidal route to synthesize BH4--capped PdxAgy nanoparticles (NPs) in water using the reducing ionic liquids of [Cnmim]BH4, and the resulting NPs were prone to form the nanocomposites with [amim]+-modified reduced graphene (RG). The removal of the metal-free inorganic ions of BH4- can create the profoundly exposed interfaces on the PdxAgy NPs during the electrooxidation, and favor the ethanol oxidation reaction (EOR) in lowering energy barrier. The counterions of [Cnmim]+ can gather ethanol, OH- ions, and the reaction intermediates on catalysts, and synergistically interact with RG to facilitate the charge transfer in nanocomposites...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28445026/chromium-poisoning-effects-on-surface-exchange-kinetics-of-la0-6sr0-4co0-2fe0-8o3-%C3%AE
#10
Yi-Lin Huang, A Mohammed Hussain, Christopher Pellegrinelli, Chunyan Xiong, Eric D Wachsman
The presence of Cr has already been reported in literature to cause severe degradation to La0.6Sr0.4Co0.2Fe0.8O3- δ (LSCF). However, fundamental understanding of Cr effects on the surface exchange kinetics is still lacking. For the first time in-situ gas phase isotopic oxygen exchange was utilized to quantitatively determine Cr effect on oxygen exchange kinetics of LSCF powder as a function of temperature and water vapor. Our investigations revealed that the formation of secondary phases, such as SrCrO¬4, Cr2O3, Cr-Co-Fe-O, and La-Co-Fe-O, can affect both the oxygen dissociation step and overall surface exchange...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28444989/water-soluble-naked-gold-nanoclusters-are-not-luminescent
#11
Julia Perez-Prieto, Pablo Londoño-Larrea, Julie P Vanegas, Daniel Cuaran, Elena Zaballos-García
We report here the synthesis of water-dispersible naked gold nanoclusters (AuNCnaked) by a simple reduction of HAuCl4 with NaOH at room temperature and show that they are non-luminescent. They were then easily passivated with different thiols and adenosine monophosphate to lead to luminescent NCs. This is an important finding as the photoluminescence of the passivated NCs can now be clearly attributed to the ligand-AuNC surface interaction. These results are also highly relevant from the point of view of the preparation of luminescent NCs from the same NC batch...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444701/is-electrolyte-transfer-across-the-urothelium-important-ici-rs-2015
#12
REVIEW
Karen D McCloskey, Bahareh Vahabi, Christopher H Fry
AIMS: This article summarizes discussion at the International Consultation on Incontinence Research Society (ICI-RS) 2015 meeting of urine modification in the urinary tract by the urothelium. It considers the literature and proposes pertinent questions that need to be addressed to understand this phenomenon within a physiological context. METHODS: Following the ICI-RS meeting, publications in PubMed relating to urine modification in the renal pelvis, ureter, and bladder were reviewed...
April 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28443916/a-kinetic-model-of-water-adsorption-clustering-and-dissociation-on-the-fe3s4-001-surface
#13
Alberto Roldan, Nora H de Leeuw
The interaction of water with catalyst surfaces is a common process which requires investigation. Here, we have employed density functional theory calculations to investigate the adsorption of up to ten water molecules on the {001} surface of greigite (Fe3S4), which owing to its redox properties, is of increasing interest as a catalyst, e.g. in electro-catalysis. We have systematically analyzed and characterized the modes of water adsorption on the surface, where we have considered both molecular and dissociative adsorption processes...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28443913/the-effect-of-surface-roughness-and-viscoelasticity-on-rubber-adhesion
#14
A Tiwari, L Dorogin, A I Bennett, K D Schulze, W G Sawyer, M Tahir, G Heinrich, B N J Persson
Adhesion between silica glass or acrylic balls and silicone elastomers and various industrial rubbers is investigated. The work of adhesion during pull-off is found to strongly vary depending on the system, which we attribute to the two opposite effects: (1) viscoelastic energy dissipation close to an opening crack tip and (2) surface roughness. Introducing surface roughness on the glass ball is found to increase the work of adhesion for soft elastomers, while for the stiffer elastomers it results in a strong reduction in the work of adhesion...
April 26, 2017: Soft Matter
https://www.readbyqxmd.com/read/28443866/in-situ-investigation-of-degradation-at-organometal-halide-perovskite-surfaces-by-x-ray-photoelectron-spectroscopy-at-realistic-water-vapour-pressure
#15
Jack Chun-Ren Ke, Alex S Walton, David J Lewis, Aleksander Tedstone, Paul O'Brien, Andrew G Thomas, Wendy R Flavell
Near-ambient-pressure X-ray photoelectron spectroscopy enables the study of the reaction of in situ-prepared methylammonium lead iodide (MAPI) perovskite at realistic water vapour pressures for the first time. We show that MAPI decomposes directly to PbI2, HI and NH3 without formation of methylammonium iodide, allowing us to distinguish between alternative mechanisms for the atmospheric degradation reaction.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443722/reflections-on-o2-as-a-biosignature-in-exoplanetary-atmospheres
#16
Victoria S Meadows
Oxygenic photosynthesis is Earth's dominant metabolism, having evolved to harvest the largest expected energy source at the surface of most terrestrial habitable zone planets. Using CO2 and H2O-molecules that are expected to be abundant and widespread on habitable terrestrial planets-oxygenic photosynthesis is plausible as a significant planetary process with a global impact. Photosynthetic O2 has long been considered particularly robust as a sign of life on a habitable exoplanet, due to the lack of known "false positives"-geological or photochemical processes that could also produce large quantities of stable O2...
April 26, 2017: Astrobiology
https://www.readbyqxmd.com/read/28443655/new-insights-on-electro-optical-response-of-pedot-pss-film-to-humidity
#17
Eric S Muckley, Christopher B Jacobs, Keith Vidal, Jyoti P Mahalik, Rajeev Kumar, Bobby G Sumpter, Ilia Ivanov
Understanding the relative humidity (RH) response of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is critical for improving the stability of organic electronic devices and developing selective sensors. In this work combined gravimetric sensing, nanoscale surface probing, and mesoscale optoelectronic characterization are used to directly compare the RH dependence of electrical and optical conductivities and unfold connections between the rate of water adsorption and changes in functional properties of PEDOT:PSS film...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28443626/nanodiamond-enhanced-mri-via-in-situ-hyperpolarization
#18
David E J Waddington, Mathieu Sarracanie, Huiliang Zhang, Najat Salameh, David R Glenn, Ewa Rej, Torsten Gaebel, Thomas Boele, Ronald L Walsworth, David J Reilly, Matthew S Rosen
Nanodiamonds are of interest as nontoxic substrates for targeted drug delivery and as highly biostable fluorescent markers for cellular tracking. Beyond optical techniques, however, options for noninvasive imaging of nanodiamonds in vivo are severely limited. Here, we demonstrate that the Overhauser effect, a proton-electron polarization transfer technique, can enable high-contrast magnetic resonance imaging (MRI) of nanodiamonds in water at room temperature and ultra-low magnetic field. The technique transfers spin polarization from paramagnetic impurities at nanodiamond surfaces to (1)H spins in the surrounding water solution, creating MRI contrast on-demand...
April 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28443331/coupling-between-the-dynamics-of-water-and-surfactants-in-lyotropic-liquid-crystals
#19
Jesse Gatten McDaniel, Arun Yethiraj
Bilayers composed of lipid or surfactant molecules are central to biological membranes and lamellar lyotropic liquid crystalline (LLC) phases. Common to these systems are phases that exhibit either ordered or disordered packing of the hydrophobic tails. In this work, we study the impact of surfactant ordering, i.e., disordered Lα and ordered Lβ LLC phases, on the dynamics of water in the lamellar phases of dicarboxylate gemini surfactants. We study the different phases at identical hydration levels by changing the length of the hydrophobic tails; surfactants with shorter tails form Lα phases and those with longer tails form Lβ phases...
April 26, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28443116/comparative-analysis-of-phosphoproteome-remodeling-after-short-term-water-stress-and-aba-treatments-versus-longer-term-water-stress-acclimation
#20
Govinal B Bhaskara, Thao T Nguyen, Tsu-Hao Yang, Paul E Verslues
Several studies have used short term dehydration, osmotic stress or Abscisic Acid (ABA) treatments to identify the initial protein phosphorylation-dephosphorylation responses to drought and low water potential or ABA treatments. However, longer term drought acclimation leads to altered expression of many kinases and phosphatases suggesting that it may also produce unique changes in phosphoproteome composition. To get a better overview of the state of drought-related phosphoproteomics and investigate this question of short versus longer term phosphoproteome regulation, we compared three Arabidopsis thaliana studies analyzing short term phosphoproteome changes to recent data from our laboratory analyzing phosphoproteome changes after a longer drought acclimation treatment...
2017: Frontiers in Plant Science
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