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https://www.readbyqxmd.com/read/29349743/chemically-and-size-resolved-particulate-matter-dry-deposition-on-stone-and-surrogate-surfaces-inside-and-outside-the-low-emission-zone-of-milan-application-of-a-newly-developed-deposition-box
#1
Luca Ferrero, Marco Casati, Lara Nobili, Luca D'Angelo, Grazia Rovelli, Giorgia Sangiorgi, Cristiana Rizzi, Maria Grazia Perrone, Antonio Sansonetti, Claudia Conti, Ezio Bolzacchini, Elena Bernardi, Ivano Vassura
The collection of atmospheric particles on not-filtering substrates via dry deposition, and the subsequent study of the particle-induced material decay, is trivial due to the high number of variables simultaneously acting on the investigated surface. This work reports seasonally resolved data of chemical composition and size distribution of particulate matter deposed on stone and surrogate surfaces obtained using a new method, especially developed at this purpose. A "Deposition Box" was designed allowing the particulate matter dry deposition to occur selectively removing, at the same time, variables that can mask the effect of airborne particles on material decay...
January 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29346721/emulsion-electrospinning-of-polytetrafluoroethylene-ptfe-nanofibrous-membranes-for-high-performance-triboelectric-nanogenerators
#2
Pengfei Zhao, Navneet Soin, K Prashanthi, Jinkai Chen, Shurong Dong, Erping Zhou, Zhigang Zhu, Anand Arcot Narasimulu, Carlo D Montemagno, Liyang Yu, Jikui Luo
Electrospinning is a simple, versatile technique for fabricating fibrous nanomaterials with the desirable features of extremely high porosities and large surface areas. Using emulsion electrospinning, polytetrafluoroethylene/polyethene oxide (PTFE/PEO) membranes were fabricated followed by a sintering process to obtain pure PTFE fibrous membranes, which were further utilised against a polyamide 6 (PA6) membrane for vertical contact-mode triboelectric nanogenerators (TENGs). Electrostatic force microscopy (EFM) measurements of the sintered electrospun PTFE membranes revealed the presence of both positive and negative surface charges owing to the transfer of positive charge from PEO which further corroborated by FTIR measurements...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29333666/stable-high-index-faceted-pt-skin-on-zigzag-like-ptfe-nanowires-enhances-oxygen-reduction-catalysis
#3
Mingchuan Luo, Yingjun Sun, Xu Zhang, Yingnan Qin, Mingqiang Li, Yingjie Li, Chunji Li, Yong Yang, Lei Wang, Peng Gao, Gang Lu, Shaojun Guo
Selectively exposing active surfaces and judiciously tuning the near-surface composition of electrode materials represent two prominent means of promoting electrocatalytic performance. Here, a new class of Pt3 Fe zigzag-like nanowires (Pt-skin Pt3 Fe z-NWs) with stable high-index facets (HIFs) and nanosegregated Pt-skin structure is reported, which are capable of substantially boosting electrocatalysis in fuel cells. These unique structural features endow the Pt-skin Pt3 Fe z-NWs with a mass activity of 2.11 A mg-1 and a specifc activity of 4...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29332215/heparin-coated-grafts-reduce-mortality-in-pediatric-patients-receiving-systemic-to-pulmonary-shunts
#4
Adeel Ashfaq, Mohammad S Soroya, Amit Iyengar, Myke Federman, Brian L Reemtsen
We aimed to evaluate the outcomes of systemic-to-pulmonary (SP) shunt procedures utilizing heparin-coated (HC) polytetrafluoroethylene (PTFE) vascular grafts compared to uncoated (non-HC) grafts, in order to observe any benefits in pediatric patients. Our institution switched from using non-HC grafts to HC grafts in March 2011. We conducted a retrospective review of consecutive pediatric patients receiving SP shunts from May 2008 to December 2015. Perioperative variables including baseline characteristics, morbidity, mortality, and blood product utilization were evaluated between the HC and non-HC groups...
January 13, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29328622/laser-induced-conversion-of-teflon-into-fluorinated-nanodiamonds-or-fluorinated-graphene
#5
Ruquan Ye, Xiao Han, Dmitry V Kosynkin, Yilun Li, Chenhao Zhang, Bo Jiang, Angel A Marti, James M Tour
Laser-assisted materials fabrication is an advance that has propelled recent carbon synthesis approaches. Direct laser writing on polyimide or lignocellulose materials by a CO2 laser has successfully transformed the substrates into hierarchical graphene. However, formation of other carbon allotropes such as diamond and fullerene remains challenging. Here we report the direct synthesis of fluorinated nanodiamonds or fluorinated graphene by treating polytetrafluoroethylene (Teflon, or PTFE) with a 9.3 μm pulsed CO2 laser under argon; no exogenous fluorine source is needed...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29316231/osteogenic-cellular-activity-around-onlaid-octacalcium-phosphate-gelatin-composite-onto-rat-calvaria
#6
Ryosuke Iwama, Takahisa Anada, Yukari Shiwaku, Kaori Tsuchiya, Tetsu Takahashi, Osamu Suzuki
The activity and the distribution of osteogenic cells around octacalcium phosphate (OCP) granules combined with gelatin matrix (OCP/Gel) onlaid on rat calvaria were analyzed histomorphometrically and immunohistochemically during vertical bone augmentation under mechanical or non-mechanical environment until 8 weeks. OCP/Gel disk was placed in subperiosteal pocket on the calvaria with or without polytetrafluoroethylene (PTFE) support. The latter is a non-mechanical stress model to alleviate the mechanical stress from the subcutaneous tissues...
January 9, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29315304/transjugular-intrahepatic-portosystemic-shunts-tips-for-the-prevention-of-variceal-re-bleeding-a-two-decades-experience
#7
Theresa Bucsics, Maria Schoder, Magdalena Diermayr, Maria Feldner-Busztin, Nicolas Goeschl, David Bauer, Philipp Schwabl, Mattias Mandorfer, Bernhard Angermayr, Manfred Cejna, Arnulf Ferlitsch, Wolfgang Sieghart, Michael Trauner, Markus Peck-Radosavljevic, Josef Karner, Franz Karnel, Thomas Reiberger
BACKGROUND AND AIMS: Transjugular intrahepatic portosystemic shunts (TIPS) are used in patients with cirrhosis for the prevention of variceal rebleeding. METHODS: We retrospectively evaluated re-bleeding rate, patency, mortality, and transplant-free survival (TFS) in cirrhotic patients receiving TIPS implantation for variceal bleeding between 1994-2014. RESULTS: 286 patients received TIPS (n = 119 bare metal stents, n = 167 polytetrafluorethylene (PTFE)-covered stents) for prevention of variceal re-bleeding...
2018: PloS One
https://www.readbyqxmd.com/read/29303754/surface-treatment-of-implant-materials-with-antimicrobial-nanoparticulates
#8
Nathalia Ferraz Oliscovicz, Denise Tornavoi de Castro, Mariana Lima da Costa Valente, Evandro Watanabe, César Penazzo Lepri, Andréa Cândido Dos Reis
This study analyzed nanostructured silver vanadate (AgVO3) films on certain substrate surfaces found in dental implant devices in order to see if these films promote antimicrobial activity. Enamel and glaze vehicles were used to apply the nanomaterial (0.0% [control], 2.5%, 5.0%, and 10.0% concentrations) on 3 substrates (280 specimens per substrate): polytetrafluoroethylene (PTFE), polyacetal, and acrylic resin. An agar diffusion method was performed in triplicate to determine the antimicrobial activity against 8 microorganisms...
January 2018: General Dentistry
https://www.readbyqxmd.com/read/29285337/management-of-the-exposure-of-a-dense-ptfe-d-ptfe-membrane-in-guided-bone-regeneration-gbr-a-case-report
#9
P Ghensi, W Stablum, E Bettio, M C Soldini, T R Tripi, C Soldini
Guided bone regeneration (GBR) is a well-established and generally predictable method for repairing alveolar ridge defects and preparing edentulous sites for implant placement. Standard GBR involves filling the space underneath a membrane with autogenous bone or a mixture composed of autogenous bone particles and allogeneic bone tissue or heterologous biomaterials. The use of a barrier membrane for GBR has sometimes been associated with complications, however - reportedly involving exposure, infection, and collapse - and the non-resorbable types of membrane seem to be involved more often than the resorbable solutions...
July 2017: Oral & Implantology
https://www.readbyqxmd.com/read/29280700/open-and-endovascular-treatment-by-covered-and-multilayer-stents-in-the-therapy-of-renal-artery-aneurysms-mid-and-long-term-outcomes-in-a-single-center-experience
#10
L Irace, J Ben Hamida, O Martinelli, R Stumpo, F G Irace, S Venosi, R Gattuso, P B Berloco, B Gossetti
AIM: The purpose of this paper is to evaluate the mid and long terms outcomes of open and endovascular surgical treatment, as well as multilayer stent, in patients affected by Renal Artery Aneurysm (RAA). PATIENTS AND METHODS: Twenty five patients with RAA (24 monolateral and 1 bilateral aneurysm, 26 aneurysms) were observed between 2000 and 2015: 4 were not treated due to the small size of the aneurysm (< 2.5 cm); out of the remaining, 16 underwent endovascular treatment, 2 were treated by open surgery consisting in aneurysmectomy and graft reconstruction and 5 (in 1 patient bilateral) were treated by ex vivo repair and autotransplantation...
September 2017: Il Giornale di Chirurgia
https://www.readbyqxmd.com/read/29259867/ptfe-based-microreactor-system-for-the-continuous-synthesis-of-full-visible-spectrum-emitting-cesium-lead-halide-perovskite-nanocrystals
#11
Chengxi Zhang, Weiling Luan, Yuhang Yin, Fuqian Yang
Colloidal perovskite nanocrystals comprised of all inorganic cesium lead halide (CsPbX3, X = Cl, Br, I or a mixture thereof) have potential as optical gain materials due to their high luminescence efficiency. In this work, cesium lead halide nanocrystals are continuously synthesized via a microreactor system consisting of poly(tetrafluoroethylene) (PTFE) capillaries. The synthesized nanocrystals possess excellent optical properties, including a full width at half maximum of 19-35 nm, high fluorescence quantum yield of 47...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29259580/rapid-in-vitro-quantification-of-s-aureus-biofilms-on-vascular-graft-surfaces
#12
Monika Herten, Theodosios Bisdas, Dennis Knaack, Karsten Becker, Nani Osada, Giovanni B Torsello, Evgeny A Idelevich
Objectives: Increasing resistance of microorganisms and particularly tolerance of bacterial biofilms against antibiotics require the need for alternative antimicrobial substances. S. aureus is the most frequent pathogen causing vascular graft infections. In order to evaluate the antimicrobial efficacy, quantification of the bacterial biofilms is necessary. Aim of the present study was the validation of an in vitro model for quantification of bacterial biofilm on vascular graft surfaces using three different assays...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29251305/dissolution-of-oligo-tetrafluoroethylene-and-preparation-of-poly-tetrafluoroethylene-based-composites-by-using-fluorinated-ionic-liquids
#13
Akiko Tsurumaki, Hiroyuki Ohno
Fluorophilic ionic liquids (ILs) showing enhanced compatibility with poly(tetrafluoroethylene) (PTFE) have been newly synthesised. The as-designed ILs contributed both to the dissolution of PTFE oligomers and to the preparation of composites with PTFE with no fear of bleed-out of the ILs.
December 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29248804/comparison-of-colloidal-silica-involved-fouling-behavior-in-three-membrane-distillation-configurations-using-ptfe-membrane
#14
Wenli Qin, Zongli Xie, Derrick Ng, Ying Ye, Xiaosheng Ji, Stephen Gray, Jianhua Zhang
Colloidal silica involved fouling behaviors in direct contact membrane distillation (DCMD), vacuum membrane distillation (VMD) and sweeping gas membrane distillation (SGMD) were studied. Three foulants were used in the experiments, including colloidal silica as representative of particulate foulants, calcium bicarbonate as dissolved inorganic foulant, and NOM (humic acid + alginate + BSA) as the dissolved organic foulant. The three types of fouants were combined to produce four different feed waters: silica alone; silica + calcium bicarbonate; silica + NOM; and silica + calcium bicarbonate + NOM...
December 5, 2017: Water Research
https://www.readbyqxmd.com/read/29242066/external-polytetrafluoroethylene-reinforcement-of-varicose-autologous-vein-grafts-in-peripheral-bypass-surgery-produces-durable-bypass-function
#15
Achim Neufang, Christine Espinola-Klein, Savvas Savvidis, Walther Schmiedt, Alicia Poplawski, Christian Friedrich Vahl, Bernhard Dorweiler
OBJECTIVE: Use of autologous veins as peripheral bypass graft may become critical in the presence of significant varicose degeneration of the harvested vein. External support of such dilated veins with standard polytetrafluoroethylene (PTFE) prostheses was recommended as an option to use these veins for peripheral bypass. A single-center experience with this technique regarding long-term graft function, secondary reinterventions, and potential graft degeneration is presented. METHODS: Between January 1995 and January 2006, there were 54 patients with varicose veins who underwent 57 consecutive infrainguinal vein bypass operations with PTFE reinforcement in 57 limbs...
December 11, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29216106/full-four-dimensional-and-reciprocal-mueller-matrix-bidirectional-reflectance-distribution-function-of-sintered-polytetrafluoroethylene
#16
Thomas A Germer
We measured the Mueller matrix bidirectional reflectance distribution function (BRDF) of a sintered polytetrafluoroethylene (PTFE) sample over the scattering hemisphere for six incident angles (0°-75° in 15° steps) and for four wavelengths (351 nm, 532 nm, 633 nm, and 1064 nm). The data for each wavelength were fit to a phenomenological description for the Mueller matrix BRDF, which is an extension of the bidirectional surface scattering modes developed by Koenderink and van Doorn [J. Opt. Soc. Am. A.15, 2903 (1998)JOAOD60740-323210...
November 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29215047/harvesting-energy-from-low-frequency-excitations-through-alternate-contacts-between-water-and-two-dielectric-materials
#17
Jian Yu, Enze Ma, Tianwei Ma
Recent studies have demonstrated the benefits of water-dielectric interfaces in electrostatic energy harvesting. Most efforts have been focused on extracting the kinetic energy from the motions of water drops on hydrophobic surfaces, and thus, the resulting schemes inherently prefer cases where the water drops move at a high speed, or vibrate at a high frequency. Here we report a method for directly harvesting ambient mechanical energy as electric potential energy through water droplets by making alternate contacts with CYTOP and PTFE thin films...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29210771/effect-of-inhaled-nitric-oxide-on-hemodynamics-in-lambs-with-1%C3%A2-ventricle-circulation
#18
Hitoshi Kanamitsu, Yasuhiro Fujii, Luca Centola, Katsushi Kinouchi, Liqun Zhu, Robert K Riemer, Olaf Reinhartz
Inhaled nitric oxide (NO) is widely used to treat postoperative pulmonary hypertension in congenital heart disease. It is believed that NO increases cardiac output (CO) by decreasing pulmonary vascular resistance (PVR), leading to increased left ventricular preload. However, the effect of NO on CO in patients with 1½ ventricle circulation remains unclear. To evaluate this, a superior cavopulmonary (SCP) shunt was constructed in 10 juvenile sheep. A PTFE graft was inserted between the superior vena cava (SVC) and the main pulmonary artery (PA)...
November 27, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29203046/-post-traumatic-carotido-jugular-fistula-case-report-and-review-of-the-literature
#19
A Dammak, H Ben Jmaà, S Hadhri, H Cheikhrouhou, F Dhouib, S Haddar, L Kammoun, T Ben Jmaà, B Hammami, S Masmoudi, N Elleuch, M Ben Jmaà, I Frikha
The neck, being not protected by skeleton, is vulnerable to external trauma and injury which can involve blood vessels, muscles, nerves, and trachea. Carotid injuries can be potentially life-threatening by hemorrhage and stroke. We present a case of a 26-year-old manual worker who presented a neck injury caused by a metallic projectile. The injury involved the right common carotid artery with an internal jugular vein fistula, and tracheal damage. The patient was managed with surgical repair of the tracheal lesion, reconstruction of the carotid section using a PTFE graft bypass, and ligation of the internal jugular vein...
December 2017: Journal de Médecine Vasculaire
https://www.readbyqxmd.com/read/29203042/-treatment-of-radiation-induced-iliofemoral-arterial-complications-with-groin-radionecrosis
#20
J-M Fichelle
Long-term iliofemoral complications induced by radiation include vascular (arterial and venous) lesions, nervous lesions and soft tissue loss that can be cutaneous and subcutaneous and potentially lead to radionecrosis with vessel exposure. We present five cases of groin radionecrosis. There were three men and two women (age 30-73 years). Radiotherapy had been delivered 15 years earlier in three cases, and 2 years earlier in two cases. Symptoms were intermittent claudication (n=1), critical ischemia (n=1), and septic hemorrhage (n=1)...
December 2017: Journal de Médecine Vasculaire
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