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argon plasma

Andrea Anderloni, Francesco Auriemma, Alessandro Fugazza, Roberta Maselli, Alessandro Repici
No abstract text is available yet for this article.
January 12, 2018: Endoscopy
Xun Xiao, Chunxiong Bao, Yanjun Fang, Jun Dai, Benjamin R Ecker, Congcong Wang, Yuze Lin, Shi Tang, Ye Liu, Yehao Deng, Xiaopeng Zheng, Yongli Gao, Xiao Cheng Zeng, Jinsong Huang
The surface composition of perovskite films is very sensitive to film processing and can deviate from the optimal, which generates unfavorable defects and results in efficiency loss in solar cells and slow response speed in photodetectors. An argon plasma treatment is introduced to modify the surface composition by tuning the ratio of organic and inorganic components as well as defect type before deposition of the passivating layer. It can efficiently enhance the charge collection across the perovskite-electrode interface by suppressing charge recombination...
January 10, 2018: Advanced Materials
Kwangwoo Nam, Tae Jun Song, Raymond E Kim, Dong Hui Cho, Min Keun Cho, Dongwook Oh, Do Hyun Park, Sang Soo Lee, Dong-Wan Seo, Sung Koo Lee, Myung-Hwan Kim, Seunghee Baek
BACKGROUND AND AIM: Endoscopic snare papillectomy (ESP) is an effective treatment for ampullary adenoma. Argon plasma coagulation (APC) is widely used as an additional method to control bleeding or ablate the residual tumor. However, the efficacy of this procedure has not yet been fully evaluated. This study aimed to evaluate the usefulness of APC as an additional method to ESP. METHODS: The patients who underwent ESP for ampullary adenoma between September 2005 and September 2015 were retrospectively reviewed...
December 29, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
Sander Bekeschus, Anke Schmidt, Felix Niessner, Torsten Gerling, Klaus-Dieter Weltmann, Kristian Wende
In plasma medicine, ionized gases with temperatures close to that of vertebrate systems are applied to cells and tissues. Cold plasmas generate reactive species known to redox regulate biological processes in health and disease. Pre-clinical and clinical evidence points to beneficial effects of plasma treatment in the healing of chronic ulcer of the skin. Other emerging topics, such as plasma cancer treatment, are receiving increasing attention. Plasma medical research requires interdisciplinary expertise in physics, chemistry, and biomedicine...
November 17, 2017: Journal of Visualized Experiments: JoVE
Ravindra Kotian, P Prasad Rao, Prashanthi Madhyastha
Objective: The aim is to study the effect of plasma working gas on composition, crystallinity, and microstructure of hydroxyapatite (HA) coated on Ti and Ti-6Al-4V metal substrates. Materials and Methods: Ti and Ti-6Al-4V metal substrates were coated with HA by plasma spray using four plasma gas atmospheres of argon, argon/hydrogen, nitrogen, and nitrogen/hydrogen. The degree of crystallinity, the phases present, and microstructure of HA coating were characterized using X-ray diffraction and scanning electron microscopy...
October 2017: European Journal of Dentistry
Victor Eduardo de Souza Batista, Aljomar José Vechiato-Filho, Paulo Francisco Cesar, Marcelo Coelho Goiato, Elidiane Cipriano Rangel, Eduardo Piza Pellizzer, Fellippo Ramos Verri, Valentim Adelino Ricardo Barão, Daniela Micheline Dos Santos
PURPOSE: To characterize the surface of glass fiber posts (GFP) after different surface treatments and evaluate which method incorporates higher amounts of silicon (Si) particles, as well as to evaluate the bond strength at the post/ composite-cement interface with four different surface treatments of glass fiber posts luted with composite cement. MATERIALS AND METHODS: Twelve glass fiber posts were obtained from the manufacturer. The posts were randomly distributed into four groups (n = 3): Co (control), no surface treatment; S, 70% alcohol and silane (60 s); HF + S, 10% hydrofluoric acid gel (60 s) and silane (60 s); NTP, nonthermal plasma of hexamethyldisiloxane (HMDSO) associated with argon (30 min)...
December 19, 2017: Journal of Adhesive Dentistry
Leonid Mochalov, Dominik Dorosz, Mikhail Kudryashov, Aleksey Nezhdanov, Dmitry Usanov, Daniela Gogova, Sergey Zelentsov, Aleksey Boryakov, Alexandr Mashin
AsS chalcogenide films, where As content is 60-40at.%, have been prepared via a RF non-equilibrium low-temperature argon plasma discharge, using volatile As and S as the precursors. Optical properties of the films were studied in UV-visible-NIR region in the range from 0.2 to 2.5μm. Infrared and Raman spectroscopy have been employed for the elucidation of the molecular structure of the newly developed material. It was established that PECVD films possess a higher degree of transparency (up to 80%) and a wider transparency window (>20μm) in comparison with the "usual" AsS thin films, prepared by different thermal methods, which is highly advantageous for certain applications...
December 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Oliver Pech
No abstract text is available yet for this article.
October 2017: Gastroenterology & Hepatology
Chao Liu, Jia-Jia Wang, Ye-Han Zhu, Cheng Chen
We present a rare case of giant endobronchial hamartoma coexisting with lung atelectasis for more than 3 years. The small specimen initially biopsied via bronchoscope did not reveal tissue features, but some features were suspicious for squamous cell carcinoma. The lesion was removed completely using snare electrocautery combined with argon plasma coagulation via flexible fiberoptic bronchoscopy. The patient made a satisfactory recovery, and a pathological diagnosis was made. This could be a useful option in selected endobronchial tumors...
December 2017: Therapeutic Advances in Respiratory Disease
Li Zheng, Ming-Sheng Chen, Lu Wang
PURPOSE:To observe the effects of a non-thermal atmospheric pressure argon plasma jet on the healing time, and the levels of superoxide dismutase(SOD)and malondialdehyde(MDA)in oral mucosal ulcer of golden hamsters.METHODS: 56 golden hamsters were randomly assigned to 8 groups, one normal control group, one ulcer group, one natural healing group without any therapy, one iodine glycerin group, two argon groups (30 s, 120 s)and two plasma groups (30 s, 120 s).24 hours after the last treatment, 4 hamsters from each group were sacrificed to detect SOD and MDA levels in the oral mucosal ulcer by spectrophotometry...
August 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Jun Li, Ye Tao, Shufen Chen, Huiying Li, Ping Chen, Meng-Zhu Wei, Hu Wang, Kun Li, Marco Mazzeo, Yu Duan
Silver nanowires (AgNWs) are a promising candidate to replace indium tin oxide (ITO) as transparent electrode material. However, the loose contact at the junction of the AgNWs and residual surfactant polyvinylpyrrolidone (PVP) increase the sheet resistance of the AgNWs. In this paper, an argon (Ar) plasma treatment method is applied to pristine AgNWs to remove the PVP layer and enhance the contact between AgNWs. By adjusting the processing time, we obtained AgNWs with a sheet resistance of 7.2Ω/□ and a transmittance of 78% at 550 nm...
November 28, 2017: Scientific Reports
Helga C A W Alhinho, Flávio C Ferreira, Rodrigo C L Medeiros, Álvaro A B Ferraz, Josemberg M Campos
BACKGROUND: Gastric leak is a severe complication of gastric bypass that is associated with significant morbidity and mortality. Anastomosis dehiscence usually occurs at gastrojejunal anastomosis and can appear simultaneously with gastric leak, for which treatment can be a challenge. Fistula may have several clinical impacts, depending on patient-related factors, fistula characteristics, onset time, and therapy proposal. Abdominal toilet, drainage, gastrostomy, and revisional surgery constitute the traditional approaches to dehiscence and fistula closure, with variable results...
November 27, 2017: Obesity Surgery
Tianshuang Liu, Linfeng Wu, Jegdish P Babu, Timothy L Hottel, Franklin Garcia-Godoy, Liang Hong
PURPOSE: To evaluate the bactericidal effects of atmospheric non-thermal argon/oxygen plasma on in vitro oral biofilms constructed from S. mutans and/or S. sanguinis, and the influence of the plasma on the virulence properties of A. oris. METHODS: In vitro oral biofilms were constructed in the wells of 48-well plates from S. mutans and/or S. sanguinis. The wells containing constructed biofilms and various amounts of phosphate-buffered saline (PBS) were treated with non-thermal argon/oxygen plasma brush for 2 minutes...
February 2017: American Journal of Dentistry
Eisner Salamanca, Yu-Hwa Pan, Aileen I Tsai, Pei-Ying Lin, Ching-Kai Lin, Haw-Ming Huang, Nai-Chia Teng, Peter D Wang, Wei-Jen Chang
Glow discharge plasma (GDP) treatments of biomaterials, such as hydroxyapatite/β-tricalcium phosphate (HA/β-TCP) composites, produce surfaces with fewer contaminants and may facilitate cell attachment and enhance bone regeneration. Thus, in this study we used argon glow discharge plasma (Ar-GDP) treatments to modify HA/β-TCP particle surfaces and investigated the physical and chemical properties of the resulting particles (HA/β-TCP + Ar-GDP). The HA/β-TCP particles were treated with GDP for 15 min in argon gas at room temperature under the following conditions: power: 80 W; frequency: 13...
November 23, 2017: Materials
Matthew W Stier, Christopher G Chapman, Allie Kreitman, John A Hart, Shu-Yuan Xiao, Uzma D Siddiqui, Irving Waxman
BACKGROUND AND AIMS: Due to previous manipulation or submucosal invasion, GI lesions referred for endoscopic mucosal resection (EMR) frequently have flat areas of visible tissue that cannot be snared. Current methods for treating residual tissue may lead to incomplete eradication or not allow complete tissue sampling for histologic evaluation. Our aim is to describe dissection-enabled scaffold-assisted resection (DeSCAR), a new technique combining circumferential ESD with EMR for removal of superficial non-lifting or residual "islands" with suspected submucosal involvement/fibrosis...
November 17, 2017: Gastrointestinal Endoscopy
Kazuki Hayasaka, Satoshi Shiono, Naoki Yanagawa
A 65-year-old man presented with obstructive pneumonia due to squamous cell carcinoma of the lung, which invaded the right main bronchus. Argon plasma coagulation was performed, which reduced his symptoms. Right pneumonectomy was performed after preoperative chemotherapy; the pathological diagnosis was T3N1M0 Stage IIIA. Fifteen months after surgery, he presented with bloody sputum. Bronchoscopy showed multiple endotracheal tumors, and a pathological examination revealed squamous cell carcinoma; the same histology as the primary lung cancer...
November 20, 2017: Internal Medicine
Luigi Canullo, Tullio Genova, Hom-Lay Wang, Stefano Carossa, Federico Mussano
PURPOSE: This in vitro study tested the effects of argon atmospheric pressure dielectric barrier discharge (APDBD) on different implant surfaces with regard to physical changes, bacterial decontamination, and osteoblast adhesion. MATERIALS AND METHODS: Seven hundred twenty disks with three different surface topographies-machined (MAC), titanium plasma-sprayed (TPS), and zirconia-blasted and acid-etched (ZRT)-were tested in this experiment. Bacterial adhesion tests were performed repeatedly on a simplified biofilm of Streptococcus mitis...
November 2017: International Journal of Oral & Maxillofacial Implants
Uma Ramabadran, Gillian Ryan, Xuan Zhou, Susan Farhat, Felicia Manciu, Yigang Tong, Ryan Ayler, Graham Garner
The focus of this paper is the investigation of reduced graphene oxide (GO)/nickel foam (RGON) samples for use as supercapacitor electrodes. Nickel foam samples were soaked in a GO suspension and dried before being subjected to two different methods to remove oxygen. Atmospheric pressure annealed (APA) samples were treated with a varying number (10-18) of nitrogen plasma jet scans, where sample temperatures did not exceed 280 °C. Furnace annealed (FA) samples were processed in an atmosphere of hydrogen and argon, at temperatures ranging from 600 °C to 900 °C...
November 11, 2017: Materials
H H Yen
No abstract text is available yet for this article.
December 2017: Journal of Gastroenterology and Hepatology
Omar Nasher, David Devadason, Richard J Stewart
The aim of this study was to review the aetiology, presentation and management of these patients with upper gastrointestinal bleeding (UGIB) at a tertiary children's unit in the United Kingdom. This was a retrospective single-institution study on children (<16 years) who presented with acute UGIB over a period of 5 years using known International Classification of Diseases (ICD) codes. A total of 32 children (17 males, 15 females) were identified with a total median age at presentation of 5.5 years. The majority (24/32) of patients presented as an emergency...
November 3, 2017: Children
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