Identification and quantification of ionic silver from colloidal silver prepared by electric spark discharge system and its antimicrobial potency study

2009 ◽  
Vol 473 (1-2) ◽  
pp. 298-302 ◽  
Author(s):  
Der-Chi Tien ◽  
Kuo-Hsiung Tseng ◽  
Chih-Yu Liao ◽  
Tsing-Tshih Tsung
Keyword(s):  
Spark Discharge ◽  
Colloidal Silver ◽  
Discharge System ◽  
Ionic Silver ◽  
Antimicrobial Potency ◽  
Identification And Quantification

scholarly journals Physicochemical Characterization of Simulated Welding Fumes from a Spark Discharge System

2014 ◽  
Vol 48 (7) ◽  
pp. 768-776 ◽  
Author(s):  
Jae Hong Park ◽  
Imali A. Mudunkotuwa ◽  
Jong Sung Kim ◽  
Aditya Stanam ◽  
Peter S. Thorne ◽  
...  
Keyword(s):  
Physicochemical Characterization ◽  
Spark Discharge ◽  
Welding Fumes ◽  
Discharge System

Characterization and Control of Lean Blowout Using Periodically Generated Flame Balls

2006 ◽  
Author(s):  
Peter Albrecht ◽  
Frank Bauermeister ◽  
Mirko Bothien ◽  
Arnaud Lacarelle ◽  
Jonas Moeck ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Turbines ◽  
Fuel Injection ◽  
Air Flow ◽  
Spark Discharge ◽  
Discharge System ◽  
Thermoacoustic Instabilities ◽  
Lean Blowout ◽  
Pilot Fuel ◽  
Industrial Gas Turbines

Combustion near LBO involves the complex physical processes including turbulence, air/fuel mixing, and chemical kinetics. The goal of this paper was to identify the typical combustion behaviour near LBO of the burner and to develop an effective actuator that will have the necessary control authority without having adverse effects such as increased emissions. Early detection and effective extension of lean blowout (LBO) are the keys to ensure flight safety and low emissions for aero engines, and are of importance to industrial gas turbines for operation below regulated NOx limits. In addition, efficient actuation are crucial for effective active LBO control. An experimental investigation of LBO was carried out using a swirl-stabilized atmospheric combustor with separate pilot and premix gaseous fuel (natural gas) injection systems. Systematic tests were performed including measurements of pressure, OH chemiluminescence and emissions for different combustor lengths, fuel split ratios, preheat temperatures and air flow rates. Operation near LBO may involve excitation of undesired thermoacoustic instabilities that have to be mitigated. LBO was approached by reducing the fuel flow rate while keeping the air flow rate, the preheat temperature and the other parameters constant. Control of the LBO and thermoacoustic instabilities was achieved by generating periodic flame balls. The LBO could be extended by 13 % relative to the natural lean blowout limit at nearly 50% reduced NO emission in comparison to common pilot fuel modulation. A spark discharge system was installed at the pilot fuel injection location. The periodic spark discharge was synchronized with the pulsed fuel injection at a phase shift of 165° and an operating frequency of 22 Hz to produce flame balls that affected the main combustion region. The flame balls excitation provided an effective tool for controlling the premix combustion characteristics at the LBO.

scholarly journals Multi-spark discharge system for preparation of nutritious water

2018 ◽  
Author(s):  
Tetsushi Nakaso ◽  
Toru Harigai ◽  
Sholihatta Aziz Kusumawan ◽  
Tomoya Shimomura ◽  
Tsuyoshi Tanimoto ◽  
...  
Keyword(s):  
Spark Discharge ◽  
Discharge System

A Miniature, Low Energy Spark Discharge System for Emission Spectrochemical Analysis of Solutions

1975 ◽  
Vol 29 (3) ◽  
pp. 244-255 ◽  
Author(s):  
J. Zynger ◽  
S. R. Crouch
Keyword(s):  
Emission Spectroscopy ◽  
Detection System ◽  
Spectral Characteristics ◽  
Spark Discharge ◽  
Mechanistic Studies ◽  
Time Resolved ◽  
Discharge System ◽  
Enhanced Sensitivity ◽  
Synchronous Integrator ◽  
Photoelectric Time

A miniature spark discharge system is described for solution analysis by emission spectroscopy. Samples are introduced as dry particles formed by nebulization into a heated desolvation chamber. The spark is formed by the discharge of a coaxial capacitor through a stream of argon which transports the desolvated aerosol. A photoelectric, time-resolved detection system for mechanistic studies and analytical applications is described. The detection system consists of a synchronous integrator controlled by a digital timing and sequencing system. The time-resolved spectral characteristics of the source are discussed, and time resolution is shown to provide enhanced sensitivity. Analytical results are reported for a variety of elements.

Synthesis of Titania Nanoparticles via Spark Discharge Method Using Air as a Carrier

2007 ◽  
Vol 544-545 ◽  
pp. 143-146 ◽  
Author(s):  
Hyun Cheol Oh ◽  
Jun Ho Ji ◽  
Jae Hee Jung ◽  
Sang Soo Kim
Keyword(s):  
Primary Particle ◽  
Spark Discharge ◽  
Titania Nanoparticles ◽  
Particle Sizes ◽  
Discharge System ◽  
Carrier Gas ◽  
Air Atmosphere ◽  
Aerosol Generator ◽  
Discharge Method ◽  
Pulsed Spark Discharge

A pulsed spark-discharge aerosol generator using air as a carrier gas was successfully applied to the titania nanoparticle production. The titanium vapor evaporated by spark discharge was subsequently supersaturated and condensed to titania nanoparticles by nucleation and condensation. The size and concentration of the particles can be controlled easily using air as a carrier gas by altering the repetition frequency, capacitance, gap distance, and flow rate of the spark-discharge system. TEM observation shows that the generated particles were aggregates, which primary particle sizes are a few nanometers. The element composition of the nanoparticles was titanium and the crystal phase was amorphous. XPS analysis shows that oxidation state of generated particles corresponded to TiO2. These XPS data indicates that some fraction of the evaporated titanium vapor could be oxidized in an air atmosphere by the oxidation with oxygen. However, enough time for crystallization was lacked because of raid cooling.

scholarly journals A COMPARATIVE STUDY OF IONIC SILVER BASED DRESSINGS VERSUS CONVENTIONAL DRESSINGS IN MANAGEMENT OF DIABETIC FOOT ULCERS.

2020 ◽  
pp. 77-79
Author(s):  
Ravishankar. N ◽  
Shivakumar. S ◽  
Abirami. K
Keyword(s):  
Wound Healing ◽  
Comparative Study ◽  
Diabetic Foot ◽  
T Test ◽  
Foot Ulcers ◽  
Colloidal Silver ◽  
Diabetic Foot Ulcers ◽  
Ulcer Area ◽  
Ionic Silver ◽  
End Point

AIMS: To compare the efficacy of ionic silver-based dressings with conventional saline dressings in the management of diabetic foot ulcers. OBJECTIVES: To study the efficacy of ionic silver based amorphous hydrogel dressing containing colloidal silver in management of diabetic foot ulcer healing and to compare the time taken for wound healing, number of days taken to reach the end point and cost-effectiveness, with that of conventional saline dressings. METHODS: This was a case control, prospective, comparative study conducted in Department of Surgery, JSS Hospital, Mysuru. Totally 100 patients with diabetic foot ulcers were included, equally divided into -cases (received colloidal silver dressings) and controls (received saline dressings), Simple randomization was done. Study Duration- 18 Months. Data collected regarding changes in wound size, presence of granulation tissue, slough, presence or absence of discharge, was analysed - by Chi square test, Independent T test and Paired T test. RESULTS: There was significant percentage reduction in ulcer area, 66.76±16.8 % in colloidal silver group, compared to only 2.71±4.53% in conventional saline group. The number of days to end point was significantly lesser in colloidal silver group, compared to conventional group (23.16±8.16 days vs 48.34±18.06 days), reduction of ulcer area (from 100%) was more at day 14 (48% in silver group, 89.69% in conventional group). CONCLUSION: The faster rate of wound healing in lesser number of days with significantly more reduction in ulcer area over a period of time, shows that ionic silver based amorphous hydrogel wound dressings with colloidal silver is more efficient than conventional saline dressings in diabetic foot ulcers management. As the number of dressings and number of days to end point is significantly lesser, ionic silver-based dressings are a comparatively more cost-effective treatment option as per our study.

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