Abstract Summary: Low temperature, high pressure, non‐equilibrium plasmas are now routinely used in several material processing applications, and some cases competing with low pressure areas where these have historically been dominant. Etching deposition examples of such applications. Amongst the novel applications plasmas, biomedical as electrosurgery, surface modification biocompatible materials, sterilization heat‐sensitive medical tools particularly interesting. In this paper, first a...

Atmospheric-pressure non-equilibrium plasma jets (APNP-Js), which generate in open space rather than a confined discharge gap, have recently been topic of great interest. In this paper, the development APNP-Js will be reviewed. Firstly, are grouped based on type gas used to ignite them and their characteristics discussed detail. Secondly, one most interesting phenomena APNP-Js, 'plasma bullet', is its behavior described. Thirdly, very recent developments when launched controlled environment...

Although the use of an electrical discharge to disinfect water was suggested and applied more than a hundred years ago, basic research on interaction plasmas with biological media extensively carried out only relatively recently. In this context, review various works germicidal effects atmospheric pressure, "cold" plasmas, is presented. The nonequilibrium devices discussed in review, which have been used applications by investigators, are corona discharge, diffuse dielectric-barrier...

As low-temperature nonequilibrium plasmas come to play an increasing role in biomedical applications, reliable and user-friendly sources need be developed. These plasma have meet stringent requirements such as low temperature (at or near room temperature), no risk of arcing, operation at atmospheric pressure, preferably hand-held operation, concentration ozone generation, etc. In this letter, we present a device that meets exactly requirements. This is capable generating cold plume several...

Can low-temperature plasma technology play a role in medicine? This is question that many investigators today are trying hard to give positive answer to. It did not quite start out this way. Almost two decades ago, few ldquocuriousrdquo electrical engineers and physicists with the help of ldquobraverdquo biologists/microbiologists asked themselves more basic questions: What happens biological cells if they were exposed plasma? Will die? survive? If survive, will come same or somehow...

Nonequilibrium plasmas driven by submicrosecond high voltage pulses have been proven to produce high-energy electrons, which in turn lead enhanced ionization and excitations. Here, we describe a device capable of launching cold plasma plume the surrounding air. This device, “the pencil,” is few hundred nanosecond wide at repetition rates kilohertz. Correlation between current-voltage characteristics fast photography shows that fact small bulletlike volume traveling unusually velocities. A...

The primary methods now used to sterilize contaminated media (infectious waste, tools, liquids, ...) are exposure UV radiation, incineration, or autoclaving. These have recently raised public controversies concerning their environmental effects and other health issues. In an attempt eliminate these drawbacks, new approaches based on different technologies being investigated. Irradiation by electron beam is example of such sterilization means. This paper describes a technique which has been...

The germicidal effects of a non-equilibrium atmospheric pressure plasma generated by novel resistive barrier discharge on representatives the two classes bacteria (Gram-negative and Gram-positive) are discussed. exposure, while being lethal to both bacterial classes, also produced gross structural damage in Gram-negative E. coli none was observed more structurally robust Gram-positive Bacillus subtilis. An electrophysical process involving role electrostatic tension charged body is invoked...

Recently several investigators reported on various means of generating cold plasma jets at atmospheric pressure. More interestingly, these turned out to be not continuous plasmas but trains small high velocity packets/bullets. However, until now little is known the nature 'bullets'. Here we present experimental insights into physical and chemical characteristics bullets. We show that their time initiation, distance they travel are directly dependent value applied voltage. also bullets can...

Low temperature plasmas have been used in various plasma processing applications for several decades. But it is only the last thirty years or so that sources generating such at atmospheric pressure reliable and stable ways become more prevalent. First, late 1980s, dielectric barrier discharge was to generate relatively large volume diffuse pressure. Then, early 2000s, jets can launch cold plumes ambient air were developed. Extensive experimental modeling work carried out on both methods much...

Low temperature plasmas that can be generated at atmospheric pressure and temperatures below 40 oC have in the past couple of decades opened up a new frontier plasma applications: biomedical applications. These sources produce agents, such as reactive species (radicals non-radicals), charged particles, photons, electric fields, which impactful biological effects. Investigators been busy elucidating physical biochemical mechanisms whereby low affects cells on macroscopic microscopic scales. A...

This mini review is to introduce the readers of Plasma field plasma medicine. a multidisciplinary research at intersection physics, engineering, biology and medicine only about two decades old, but community active in this emerging has grown tremendously last few years. Today, being conducted on number applications including wound healing cancer treatment. Although lot knowledge been created our understanding fundamental mechanisms that play important roles interaction between low...

Abstract Plasma medicine refers to the application of nonequilibrium plasmas at approximately body temperature, for therapeutic purposes. Nonequilibrium are weakly ionized gases which contain charged and neutral species electric fields, emit radiation, particularly in visible ultraviolet range. Medically-relevant cold atmospheric pressure plasma (CAP) sources devices usually dielectric barrier discharges jets. diagnostic methods modelling approaches used characterize densities fluxes active...

The reflection, absorption, and transmission of microwaves by a magnetized, steady-state, two-dimensional, nonuniform plasma slab is studied. A discussion on the effect various parameters reflected power, absorbed transmitted power presented. modeled series subslabs. Even though it assumed that number density constant in each subslab, overall profile across whole follows parabolic function. partial reflection coefficient at subslab boundary computed along with absorption subslab. total...

Nonthermal gaseous discharges have been found to be effective agents for biological decontamination/sterilization. The ability generate these at atmospheric pressure makes the decontamination process practical and inexpensive. In addition, fact that plasmas generated by such are cold their use suitable applications where medium preservation is desired. To fully understand biophysical biochemical processes induced interaction of living cells with discharges, a multidisciplinary approach...

Abstract Summary: A device capable of generating a relatively long cold plasma plume has recently been developed. The advantages this are: controllability and stability, room temperature atmospheric pressure operation, low power consumption. These features are what is required from source to be used reliably in material processing applications, including the biomedical applications. In communication we describe present evidence that it can successfully inactivate Escherechia coli targeted...

Nonequilibrium, atmospheric pressure discharges are rapidly becoming an important technological component in material processing applications. Amongst their attractive features is the ability to achieve enhanced gas phase chemistry without need for elevated temperatures. To further enhance plasma chemistry, pulsed operation with pulse widths nanoseconds range has been suggested. We report on a specially designed, dielectric barrier discharge based diffuse and its electrical characteristics....

A helium flow dynamics simulation is performed along the propagation region of plasma bullet to determine minimum mole fraction value necessary sustain its propagation. The launches from a jet device called 'plasma pencil' driven by unipolar square nanosecond high voltage pulses and propagates in surrounding air. During propagation, air molecules diffuse into path/helium channel bullet. It found that if ratio atoms exceeds certain limit, inhibited. In this study, limits are estimated for...

Non-thermal plasma jets in open air are composed of ionization waves commonly known as 'plasma bullets' propagating at high velocities. We present this paper an experimental study bullets produced a dielectric barrier discharge linear-field reactor fed with helium and driven by microsecond high-voltage pulses. Two discharges were between electrodes for every pulse (at the rising falling edge), but only one bullet was generated. Fast intensified charge coupled device camera imaging showed...