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argon plasma

Yi-Wen Hung, Hui-Ling Chen, Li-Tsu Lee, Kwong-Chung Tung, Da-Tain Bau, Yong-Kie Wong
BACKGROUND: In this study, we investigated the effects of treating dental implants made from titanium with argon based non-thermal plasma, immediately before insertion on implant stability and bone formation. Biodegradable sandblasting and acid etching had been previously used to modify the surface of the implants. METHODS: To obtain data for 4-time points in triplicate with references, a total of 36 dental implants were divided into 2 groups; 18 implants served as the experimental group and received a spray containing non-thermal plasma, while the other 18 implants served as controls...
May 16, 2018: Journal of the Chinese Medical Association: JCMA
S Lu, W Hu, Z Zhang, Z Ji, T Zhang
PURPOSE: This study evaluated the manufacturing method and anti-adhesion properties of a new composite mesh in the rat model, which was made from sirolimus (SRL) grafts on a poly(L-lactic acid) (PLLA)-modified polypropylene (PP) hernia mesh. METHODS: PLLA was first grafted onto argon-plasma-treated native PP mesh through catalysis of stannous chloride. SRL was grafted onto the surface of PP-PLLA meshes using catalysis of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 4-dimethylaminopyridine (DMAP) in a CH2 Cl2 solvent...
May 18, 2018: Hernia: the Journal of Hernias and Abdominal Wall Surgery
Benjamin Tadsen, Franko Greiner, Alexander Piel
A cloud of nanodust particles is created in a reactive argon-acetylene plasma. It is then transformed into a dusty magnetized argon plasma. Plasma parameters are obtained with the dust-density wave diagnostic introduced by Tadsen et al. [Phys. Plasmas 22, 113701 (2015)10.1063/1.4934927]. A change from an open to a cylindrically enclosed nanodust cloud, which was observed earlier, can now be explained by a stronger electric confinement if a vertical magnetic field is present. Using two-dimensional extinction measurements and the inverse Abel transform to determine the dust density, a redistribution of the dust with increasing magnetic induction is found...
March 2018: Physical Review. E
Soros Anuchapreeda, Patduangpuk Phengsuthi, Prapimphan Aumpansub, Naruemon Wisedopas, Thawee Ratanachuek
A 15-year-old adolescent boy presented with chronic constipation, difficulty in defecation, and episodic bloody stools. A rectal mass lesion was digitally palpated. Colonoscopy showed a large circumferential polypoid lesion of the mid-rectum. Snare polypectomy was performed, and histopathology confirmed a diagnosis of benign inflammatory cap polyposis. At 3-month follow-up, sigmoidoscopy showed multiple recurrences of polyps at the site of the previous rectal polypectomy, which were removed by combined hot snare polypectomy and argon plasma coagulation...
2018: ACG Case Reports Journal
Boram Cha, Jin-Seok Park, Seok Jeong, Don Haeng Lee, Joon Mee Kim
No abstract text is available yet for this article.
May 16, 2018: Korean Journal of Internal Medicine
Selina Winter, Mirja Christine Nolff, Sven Reese, Andrea Meyer-Lindenberg
ZIEL: der Studie war, die Keimbelastung sowie die klinische Effizienz von Polyhexanid, Argon-Kaltplasma und Kochsalzlösung zur Reduktion der Bioburden bei Hundebissverletzungen zu überprüfen. MATERIAL UND METHODEN: In die Studie eingeschlossen wurden Hunde mit Bissverletzungen, die durch ein chirurgisches Debridement mit anschließender Wundbehandlung durch Lavage mit Polyhexanid-Biguanid (A), Therapie mit kaltem Argonplasma (B) oder Lavage mit physiologischer Kochsalzlösung (C) versorgt wurden...
April 2018: Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere
Maximilien Barret, Frédéric Prat
Endoscopy allows for the screening, early diagnosis, treatment and follow up of superficial esophageal cancer. Endoscopic submucosal dissection has become the gold standard for the resection of superficial squamous cell neoplasia. Combinations of endoscopic mucosal resection and radiofrequency ablation are the mainstay of the management of Barrett's associated neoplasia. However, protruded, non-lifting or large lesions may be better managed by endoscopic submucosal dissection. Novel ablation tools, such as argon plasma coagulation with submucosal lifting and cryoablation balloons, are being developed for the treatment of residual Barrett's esophagus, since iatrogenic strictures still hamper the development of extensive circumferential resections in the esophagus...
May 2018: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
A D Patel, M Sharma, N Ramasubramanian, R Ganesh, P K Chattopadhyay
A new multi-line cusp magnetic field plasma device consisting of electromagnets with core material has been constructed with a capability to experimentally control the relative volume fractions of magnetized to unmagnetized plasma volume as well as accurate control on the gradient length scales of mean density and temperature profiles. Argon plasma has been produced using a hot tungsten cathode over a wide range of pressures 5 × 10-5 -1 × 10-3 mbar, achieving plasma densities ranging from 109 to 1011 cm-3 and the electron temperature in the range 1-8 eV...
April 2018: Review of Scientific Instruments
Hiroyuki Futani, Shunsuke Kumanishi, G O Minakawa, Shinichi Yoshiya
BACKGROUND: Osteoscopy is a minimally-invasive endoscopic technique for inspecting lesions inside bone marrow cavities. We describe the feasibility of osteoscopic surgery of giant cell tumor of bone (GCTB) in order to preserve the proximal fibula, and thereby achieve immediate recovery and avoid complications. PATIENTS AND METHODS: Five patients with GCTB in the proximal fibula were treated using osteoscopic curettage with adjuvants (argon plasma coagulation and cementation)...
May 2018: Anticancer Research
Pengfei Wei, Meiyan Qin, Xiaolong Yuan, Candong Liu, Ruxin Li, Zhinan Zeng, Peixiang Lu, Konstantin Dorfman, Weiguo Ye, Bo Yao, Qi Jie Wang, Hao Li, Jiayun Liu, Ying Zhang, Seok Yong Jeong, Gunsu S Yun, Dong Eon Kim
Plasma is a complex system involving diverse collisional processes and interactions, such as electron-impact excitation, ionization, recombination, etc. One of the most important methods for studying the properties and dynamics of plasma is to analyze the radiations from plasma. Here, we demonstrate the high-order harmonic (HH) spectroscopy for probing the complex electron-atom collision (EAC) dynamics in a laser-induced gas plasma. These measurements were carried out by using an elliptically polarized pump and a time-delayed linearly polarized probe...
May 1, 2018: Optics Letters
Álvaro Martín Ortega, Ana Lacoste, Tiberiu Minea
X-ray gas attenuators act as stress-free high-pass filters for synchrotron and free-electron laser beamlines to reduce the heat load in downstream optical elements without affecting other properties of the X-ray beam. The absorption of the X-ray beam triggers a cascade of processes that ionize and heat up the gas locally, changing its density and therefore the X-ray absorption. Aiming to understand and predict the behaviour of the gas attenuator in terms of efficiency versus gas pressure, a hybrid model has been developed, combining three approaches: an analytical description of the X-ray absorption; Monte Carlo for the electron thermalization; and a fluid treatment for the electron diffusion, recombination and excited-states relaxation...
May 1, 2018: Journal of Synchrotron Radiation
Du Changming, Shang Chao, Xiangjie Gong, Wang Ting, Wei Xiange
Metal-containing waste, a kind of new wastes, has a great potential for recycling and is also difficult to deal with. Many countries pay more and more attention to develop the metal recovery process and equipment of this kind of waste as raw material, so as to solve the environmental pollution and comprehensively utilize the discarded metal resources. Plasma processing is an efficient and environmentally friendly way for metal-containing waste. This review mainly discuss various metal-containing waste types, such as printed circuit boards (PCBs), red mud, galvanic sludge, Zircon, aluminium dross and incinerated ash, and the corresponding plasma methods, which include DC extended transferred arc plasma reactor, DC non-transferred arc plasma torch, RF thermal plasma reactor and argon and argon-hydrogen plasma jets...
April 27, 2018: Waste Management
Luigi Canullo, Tullio Genova, Nadja Naenni, Yasushi Nakajima, Katsuhiko Masuda, Federico Mussano
OBJECTIVE: plasma of argon treatment was demonstrated to increase material surface energy leading to stronger and faster interaction with cells. The aim of the present in vitro study was to test the effect of plasma treatment on different graft materials. MATERIALS AND METHODS: synthetic hydroxyapatite (Mg-HA), biphasic calcium phosphate (BCP), cancellous and cortical xenogeneic bone matrices (CaBM, CoBM) were used representing commonly used classes of bone substitute materials...
April 25, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
D Komar, L Kazak, M Almassarani, K-H Meiwes-Broer, J Tiggesbäumker
Ion emission from a nanoplasma produced in the interaction of intense optical laser pulses with argon clusters is studied resolving simultaneously charge states and recoil energies. By applying appropriate static electric fields we observe that a significant fraction of the ions Ar^{q+} (q=1-7) has electrons with binding energies lower than 150 meV; i.e., n_{Ryd}≥15 levels are populated. Charge state changes observed on a μs time scale can be attributed to electron emission due to autoionizing Rydberg states, indicating that high-ℓ Rydberg levels are populated as well...
March 30, 2018: Physical Review Letters
Xu Wang, Joseph Schwan, Noah Hood, Hsiang-Wen Hsu, Eberhard Grün, Mihály Horányi
Electrostatic dust transport has been hypothesized to explain a number of observations of unusual planetary phenomena. Here, it is demonstrated using three recently developed experiments in which dust particles are exposed to thermal plasma with beam electrons, beam electrons only, or ultraviolet (UV) radiation only. The UV light source has a narrow bandwidth in wavelength centered at 172 nm. The beam electrons with the energy of 120 eV are created with a negatively biased hot filament. When the vacuum chamber is filled with the argon gas, a thermal plasma is created in addition to the electron beam...
April 3, 2018: Journal of Visualized Experiments: JoVE
Yanan Peng, Haizhou Wang, Juerong Feng, Shilin Fang, Meng Zhang, Fan Wang, Ying Chang, Xianyan Shi, Qiu Zhao, Jing Liu
Hemorrhagic chronic radiation proctopathy (CRP) is a common complication after pelvic radiotherapy in patients with prostate or gynecological cancers. This systematic review was conducted to evaluate the efficacy and safety of argon plasma coagulation (APC) in treating hemorrhagic CRP. The databases of PubMed, Embase, and Cochrane Library were searched for related studies from inception to July 2017. Finally, 33 studies were identified with a total of 821 hemorrhagic CRP patients. After APC treatment, hemoglobin levels increased from 7...
2018: Gastroenterology Research and Practice
Davide Farronato, Davide Fumagalli, Farah Asa'ad, Giulio Rasperini
The aim of this study was to evaluate different cleaning procedures for customized laser-microtextured titanium abutments. A total of 20 customized laser-microtextured abutments were randomized into four groups: no cleaning (control group), ultrasonic treatments + autoclave cycle (group 1), ultrasonic treatments + argon plasma (group 2), and only argon plasma (group 3). Surface contaminants were assessed through scanning electron microscopy and energy-dispersive x-ray spectroscopy microanalysis. In the control group, 99...
April 20, 2018: International Journal of Periodontics & Restorative Dentistry
Paul Andrew Christensen, Zeinab T A W Mashhadani, Abd Halim Bin Md Ali, Michael A Carroll, Philip A Martin
This paper reports in-situ Fourier Transform Infra Red (FTIR) spectroscopic studies on the non-thermal plasma reaction of isopropyl alcohol in dinitrogen at Macor (a ceramic containing oxides of Al, Mg and Si) and the analogous thermally-driven process. Whilst isopropyl alcohol did not react at the Macor at temperatures up to 600°C, the study of the non-thermal plasma-driven process at the ceramic led to unexpected chemistry hitherto not observed, primarily the reaction of IPA in dinitrogen at short timescales to produce methane, HCN, acetone and "cold" CO at ca...
April 17, 2018: Journal of Physical Chemistry. A
Rena C Moon, Andre F Teixeira, Manoel Galvao Neto, Natan Zundel, Bruno Queiroz Sander, Flavio Mitidieri Ramos, Felipe Matz, Giorgio A Baretta, Luiz Gustavo de Quadros, Eduardo Grecco, Thiago Souza, Sergio A Barrichello, Admar Concon Filho, Eduardo Nobuyuki Usuy, Artagnan Menezes Barbosa de Amorim, Muhammad A Jawad
BACKGROUND: Endoscopic approaches exist for targeting weight regain after Roux-en-Y gastric bypass (RYGB), including endoscopic suturing, clipping, and sclerotherapy. Argon plasma coagulation (APC) is a noncontact electrocoagulation method, and when used in RYGB patients, it has shown reduction in the diameter of the gastrojejunal anastomosis. OBJECTIVES: To study the effectiveness of APC for weight regain in terms of weight loss for RYGB patients, from eight bariatric centers...
April 8, 2018: Obesity Surgery
Timothy R Elliott, Zacharias P Tsiamoulos, Siwan Thomas-Gibson, Noriko Suzuki, Leonidas A Bourikas, Ailsa Hart, Paul Bassett, Brian P Saunders
BACKGROUND:  Delayed bleeding is the most common significant complication after piecemeal endoscopic mucosal resection (p-EMR) of large nonpedunculated colorectal polyps (NPCPs). Risk factors for delayed bleeding are incompletely defined. We aimed to determine risk factors for delayed bleeding following p-EMR. METHODS:  Data were analyzed from a prospective tertiary center audit of patients with NPCPs ≥ 20 mm who underwent p-EMR between 2010 and 2012...
April 6, 2018: Endoscopy
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