大气压氩气等离子体射流在不同作用状态下的光电特性

Optical and Electrical Characteristics of Atmospheric Pressure Argon Plasma Jet Under Different Interaction States

为研究皮肤创伤愈合应用中作用对象对大气压等离子体射流(APPJ)特性的影响,研究了Ar APPJ分别在自由状态、处理培养液和处理皮肤组织3种不同作用状态下的基本光电特性、产生发展过程和发射光谱特性。实验发现相同实验参数的Ar APPJ在与培养液和皮肤组织作用时,管外射流的长度和直径均比自由状态下增加;Ar APPJ在轴向不同位置处的激发态粒子、活性基团种类与自由状态下是基本相同的,仅在谱线的相对强度上有所差别;管外距管口15 mm处的射流等离子体中OH自由基、第二正带系N2、激发态Ar和激发态O原子相对强度均比自由状态下升高。静电场与流场数值仿真结果表明,与自由状态相比,管口外设置不同介电常数和形态的作用对象,不仅会提高射流管外的外施电场强度,也会改变管外工作气体的摩尔浓度分布,进而引起Ar APPJ光电特性的变化。

In order to investigate the effect of treated objects on atmospheric pressure plasma jet characteristics during its application for skin wound healing,we investigated the basic optical-electrical characteristics,the processes of generation and evolution,and the emission characters of spectrum of the argon APPJ under the conditions of free standing jet state and of interacting with culture medium and skin tissue.The experimental results show that,compared with those in the free standing jet state,the length and diameter of APPJ outside nozzle are increased when Ar APPJ interacts with the culture medium and skin tissue.Besides,the excited particles and reactive species at different positions in the axial direction are basically the same as those in the free standing jet state,only the relative intensity of spectral lines is different.Moreover,the relative intensities of OH radical,the second positive band system of the nitrogen molecule,and the excited state Ar and O atom in the place 15 mm away from nozzle will increase compared with those in the free standing jet state.The numerical simulation results of electric and flow field distribution indicate that,compared with in the free standing jet state,the treated objects with different permittivity and state set outside the quartz tube not only make the applied electric field intensity to be strengthened,but also change the molar concentration distribution of working gas outside the tube.These factors may further change the optical and electrical characteristics of Ar APPJ eventually.