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https://www.readbyqxmd.com/read/29786729/application-of-a-constant-hole-volume-sanchez-lacombe-equation-of-state-to-mixtures-relevant-to-polymeric-foaming
#1
Kier von Konigslow, Chul B Park, Russell B Thompson
A variant of the Sanchez-Lacombe equation of state is applied to several polymers, blowing agents, and saturated mixtures of interest to the polymer foaming industry. These are low-density polyethylene-carbon dioxide and polylactide-carbon dioxide saturated mixtures as well as polystyrene-carbon dioxide-dimethyl ether and polystyrene-carbon dioxide-nitrogen ternary saturated mixtures. Good agreement is achieved between theoretically predicted and experimentally determined solubilities, both for binary and ternary mixtures...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29786722/an-urchin-like-mgco-2-o-4-ppy-core-shell-composite-grown-on-ni-foam-for-a-high-performance-all-solid-state-asymmetric-supercapacitor
#2
Haiwen Gao, Xiaohong Wang, Ganghu Wang, Chen Hao, Saisai Zhou, Chengxiang Huang
In recent years, the electrochemical properties of supercapacitors have been greatly improved due to continuous improvement in their composite materials. In this study, an urchin-like MgCo2O4@PPy/NF (MgCo2O4@polypyrrole/Ni foam) core-shell structure composite material was successfully developed as an electrode for supercapacitors. The MCP-2 composite material, obtained by a hydrothermal method and in situ chemical oxidative polymerization, shows a high specific capacitance of 1079.6 F g-1 at a current density of 1 A g-1, which is much higher than that of MC (783...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786164/air-activated-self-decontaminating-polydicyclopentadiene-polyhipe-foams-for-rapid-decontamination-of-chemical-warfare-agents
#3
Christopher L McGann, Grant C Daniels, Spencer L Giles, Robert B Balow, Jorge L Miranda-Zayas, Jeffrey G Lundin, James H Wynne
The threat of chemical warfare agents (CWA) compels research into novel self-decontaminating materials (SDM) for the continued safety of first-responders, civilians, and active service personnel. The capacity to actively detoxify, as opposed to merely sequester, offending agents under typical environmental conditions defines the added value of SDMs in comparison to traditional adsorptive materials. Porous polymers, synthesized via the high internal phase emulsion (HIPE) templating, provide a facile fabrication method for materials with permeable open cellular structures that may serve in air filtration applications...
May 22, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29785976/the-study-of-attenuation-levels-and-the-comfort-of-earplugs
#4
Alessandra G Samelli, Raquel F Gomes, Tiago V Chammas, Bárbara G Silva, Renata R Moreira, Ana C Fiorini
Introduction: This study aimed to analyze and compare four different types of earplugs, divided into premolded plugs and foam plug models, in relation to the level of attenuation, comfort, and the size of the external acoustic meatus (EAM) in an attempt to identify how these variables influence the choice of specific hearing protection devices (HPDs). Materials and Methods: A cross-sectional observational study was performed in a sample of 49 participants, oriented toward the ideal placement of four HPDs, two premolded and two foam plugs (3M™)...
May 2018: Noise & Health
https://www.readbyqxmd.com/read/29785839/optimization-of-a-secondary-voi-protocol-for-lung-imaging-in-a-clinical-ct-scanner
#5
Thomas C Larsen, Vissagan Gopalakrishnan, Jianhua Yao, Catherine P Nguyen, Marcus Y Chen, Joel Moss, Han Wen
We present a solution to meet an unmet clinical need of an in-situ "close look" at a pulmonary nodule or at the margins of a pulmonary cyst revealed by a primary (screening) chest CT while the patient is still in the scanner. We first evaluated options available on current whole-body CT scanners for high resolution screening scans, including ROI reconstruction of the primary scan data and HRCT, but found them to have insufficient SNR in lung tissue or discontinuous slice coverage. Within the capabilities of current clinical CT systems, we opted for the solution of a secondary, volume-of-interest (VOI) protocol where the radiation dose is focused into a short-beam axial scan at the z position of interest, combined with a small-FOV reconstruction at the xy position of interest...
May 21, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29782146/multiscale-interfacial-strategy-to-engineer-mixed-metal-oxide-anodes-towards-an-enhanced-cycling-efficiency
#6
Yue Ma, Cheuk-Wai Tai, Shaowen Li, Kristina Edstrom, Bingqing Wei
Interconnected macro/mesoporous structures of mixed metal oxide (MMO) are developed on nickel foam as free-standing anodes for Li-ion batteries. The sustainable production is realized via a wet chemical etching process with bio-friendly chemicals. By means of the divalent iron doping during an in-situ re-crystallization process, the as-developed MMO anodes exhibit the enhanced levels of cycling efficiency. Furthermore, this atomic-scale modification coherently synergies with the encapsulation layer across a micrometer scale...
May 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29780177/the-challenges-of-pfas-remediation
#7
Ramona Darlington, Edwin Barth, John McKernan
Many military bases and their surrounding communities are impacted by contamination with per- and polyfluoroalkyl substances (PFAS) from Aqueous Film-Forming Foams (AFFFs). Soil sorption technologies provide a promising solution to immobilize PFAS in the soil and prevent groundwater and drinking water contamination. This article is the result of a collaborative effort between Battelle and the U.S. EPA's review of the most promising technologies.
January 1, 2018: The Military engineer
https://www.readbyqxmd.com/read/29779365/hierarchical-metal-organic-framework-assembled-membrane-filter-for-efficient-removal-of-particulate-matter
#8
Won-Tae Koo, Ji-Soo Jang, Shaopeng Qiao, Wontae Hwang, Gaurav Jha, Reginald M Penner, Il-Doo Kim
Here, we propose heterogeneous nucleation assisted hierarchical growth of metal-organic framework (MOF) for efficient particulate matter (PM) removal. The assembly of 2-dimensional (2D) Zn based zeolite imidazole framework (2D-ZIF-L) in deionized water over a period time produced hierarchical ZIF-L (H-ZIF-L) on hydrophilic substrates. During the assembly, the 2nd nucleation and growth of ZIF-L occurred on the surface of 1st ZIF-L, leading to the formation of flower-like H-ZIF-L on the substrate. The flower-like H-ZIF-L was easily synthesized on various substrates, including glass, polyurethane 3D foam, nylon microfibers, and non-woven fabrics...
May 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29778681/portable-x-ray-fluorescence-for-the-detection-of-pop-bfrs-in-waste-plastics
#9
Martin Sharkey, Mohamed Abou-Elwafa Abdallah, Daniel S Drage, Stuart Harrad, Harald Berresheim
The purpose of this study was to establish the efficacy of portable X-ray fluorescence (XRF) instrumentation as a screening tool for a variety of end of life plastics which may contain excess amounts of brominated flame retardants (BFRs), in compliance with European Union (EU) and United Nations Environment Programme (UNEP) legislative limits (low POP concentration limits - LPCLs). 555 samples of waste plastics were collected from eight waste and recycling sites in Ireland, including waste electrical and electronic equipment (WEEE), textiles, polyurethane foams (PUFs), and expanded polystyrene foams...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778144/effects-of-tourmaline-on-nitrogen-removal-performance-and-biofilm-structures-in-the-sequencing-batch-biofilm-reactor
#10
Chong Tan, Haoran Xu, Di Cui, Jinlong Zuo, Junsheng Li, Yubin Ji, Shan Qiu, Lin Yao, Ying Chen, Yingjie Liu
The effects of tourmaline on nitrogen removal performance and biofilm structures were comparatively investigated in two identical laboratory-scale sequencing batch biofilm reactors (SBBRs) (denoted SBBR1 and SBBR2) at different nitrogen loading rates (NLRs) varying from (0.24±0.01) to (1.26±0.02) g N/(L·day). SBBR1 was operated in parallel with SBBR2, but SBBR1 was filled with polyurethane foam loaded tourmaline (TPU) carriers and another (SBBR2) filled with polyurethane foam (PU) carriers. Results obtained from this study showed that the excellent and stable performance of SBBR1 was obtained...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29777873/cinnamaldehyde-protects-vsmcs-against-ox-ldl-induced-proliferation-and-migration-through-s-arrest-and-inhibition-of-p38-jnk-mapks-and-nf-%C3%AE%C2%BAb
#11
Weifeng Li, Wenbing Zhi, Jinmeng Zhao, Qing Yao, Fang Liu, Xiaofeng Niu
Cinnamaldehyde (Cin), as a traditional flavor constituent isolated from the bark of Cinnamonum cassia Presl, has been commonly used for - digestive, cardiovascular and immune system diseases. The pathology of vascular smooth muscle cells (VSMCs) accelerated the progression of atherosclerosis. In our study, we found that cinnamaldehyde significantly suppressed ox-LDL-induced VSMCs proliferation, migration and inflammatory cytokine overproduction, as well as foam cell formation in VSMCs and macrophages. Moreover, cinnamaldehyde inhibited the phosphorylation of p38, JNK and p65 NF-κB and increased heme oxygenase-1 (HO-1) activity...
May 16, 2018: Vascular Pharmacology
https://www.readbyqxmd.com/read/29777840/negative-pressure-wound-therapy-to-promote-fixation-and-remodeling-of-omental-flap-in-patients-with-revascularized-limbs-a-case-series
#12
Nicla Settembre, Mario D'oria, Charbel Saba, Zakariyae Bouziane, Sergueï Malikov
We present our experience with five patients with CLTI treated with distal revascularization and omental flap coverage. We decided to investigate the efficacy and safety of NPWT (negative-pressure wound therapy) in promoting the fixation and remodeling of the omental flap as there is some evidence in the literature about the optimization of results for skin graft and dermal substitutes. Surgical revascularization was always the first procedure attempted; wound coverage was realized 3-5 days after the primary procedure (omental free-flap in three patients and omental flow-through flap in two patients)...
May 16, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29776826/recognition-of-sympathetic-crashing-acute-pulmonary-edema-scape-and-use-of-high-dose-nitroglycerin-infusion
#13
Samantha Paone, Leigha Clarkson, Billy Sin, Sheena Punnapuzha
Sympathetic Crashing Acute Pulmonary Edema (SCAPE), or flash pulmonary edema, is the extreme end of the acute pulmonary edema spectrum. A sympathetic surge occurs as a result of decreased systemic perfusion resulting in further increases in afterload, causing the patient to decompensate. Patients can decompensate quickly, therefore patients require rapid interventions. The use of high-dose nitroglycerin (HDN) has been a topic of interest as it is believed to achieve preload and afterload reduction. However, its use continues to be controversial due to concerns of drug induced hypotension, syncope or paresthesia...
May 10, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29776740/development-of-a-deformable-phantom-for-experimental-verification-of-4d-monte-carlo-simulations-in-a-deforming-anatomy
#14
Sara Gholampourkashi, Joanna E Cygler, Bernie Lavigne, Emily Heath
PURPOSE: To verify the accuracy of 4D Monte Carlo (MC) simulations, using the 4DdefDOSXYZnrc user code, in a deforming anatomy. We developed a tissue-equivalent and reproducible deformable lung phantom and evaluated 4D simulations of delivered dose to the phantom by comparing calculations against measurements. METHODS: A novel deformable phantom consisting of flexible foam, emulating lung tissue, inside a Lucite external body was constructed. A removable plug, containing an elastic tumor that can hold film and other dosimeters, was inserted in the phantom...
May 15, 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29776050/filamentary-structures-that-self-organize-due-to-adhesion
#15
A Sengab, R C Picu
We study the self-organization of random collections of elastic filaments that interact adhesively. The evolution from an initial fully random quasi-two-dimensional state is controlled by filament elasticity, adhesion and interfilament friction, and excluded volume. Three outcomes are possible: the system may remain locked in the initial state, may organize into isolated fiber bundles, or may form a stable, connected network of bundles. The range of system parameters leading to each of these states is identified...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776005/flexible-and-hierarchical-metal-organic-framework-composites-for-high-performance-catalysis
#16
Ning Huang, Hannah Drake, Jialuo Li, Jiangdong Pang, Ying Wang, Shuai Yuan, Qi Wang, Peiyu Cai, Junsheng Qin, Hong-Cai Zhou
The development of new types of porous composite materials is of great significance owing to their potentially improved performance over those of individual components and extensive applications in separation, energy storage, and heterogeneous catalysis. In this work, we integrated mesoporous metal-organic frameworks (MOFs) with macroporous melamine foam (MF) using a one-pot process, generating a series of MOF/MF composite materials with preserved crystallinity, hierarchical porosity, and increased stability over that of melamine foam...
May 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29775938/treatment-of-perfluoroalkyl-acids-by-heat-activated-persulfate-under-conditions-representative-of-in-situ-chemical-oxidation
#17
Thomas A Bruton, David L Sedlak
Perfluoroalkyl acids (PFAAs) are a class of organic contaminants notable for their extreme persistence. The unique chemical properties of these compounds make them difficult to remove from water using most standard water treatment techniques. To gain insight into the possibility of remediating contaminated groundwater by in situ chemical oxidation with heat-activated persulfate, PFAA removal and the generation of transformation products were evaluated under laboratory conditions. Solution pH had a strong influence on the removal of perfluorooctanoic acid (PFOA), resulting in its transformation into shorter-chain perfluorocarboxylic acids (PFCAs) at pH values below 3...
April 21, 2018: Chemosphere
https://www.readbyqxmd.com/read/29775882/rapid-highly-efficient-and-stable-catalytic-hydrodechlorination-of-chlorophenols-over-novel-pd-cnts-ni-foam-composite-catalyst-in-continuous-flow
#18
Jun Xiong, Ying Ma, Wei Yang, Linshan Zhong
A novel Pd/CNTs-Ni foam composite catalyst was developed for catalytic hydrodechlorination of chlorophenols by using CNTs-Ni foam as support. Characterizations including FESEM, TEM/HRTEM, HAADF-STEM and element mapping revel that the composite catalyst with 2 wt.% Pd loading possesses high porous micro-network structure and high dispersed active Pd nanoparticles (5.81 nm) on CNTs surface. The HDC of chlorophenols over Pd/CNTs-Ni foam composite catalyst has been studied in continuous-flow packed bed reactor...
May 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775205/modified-device-for-fluid-percussion-injury-in-rodents
#19
Wei Ouyang, Wenhui Wu, Zhiheng Fan, Jihui Wang, Huiju Pan, Weibin Yang
Fluid percussion (FP) injury model is a popular animal model of traumatic brain injury (TBI), but still there are some issues need to be addressed. To increase the validity and reliability of this technique, we adapted the FP device using electromagnetic protractor, stainless-steel cylinder, changing pressure transducer position, and foam pads to adjust the parameters of FP pulse. Besides, the adjusted FP device is more automatic. The FP pulse is promptly measured and displayed in a graphic user interface software...
May 18, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29774553/alkyl-glucosides-newly-identified-allergens-in-foam-wound-dressings
#20
Stefan Kerre, Tine Strobbe, Tania Naessens, Mart Theunis, Kenn Foubert, Olivier Aerts
No abstract text is available yet for this article.
May 17, 2018: Contact Dermatitis
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