共查询到20条相似文献，搜索用时 15 毫秒
1.
Ling LI 《等离子体科学和技术》2019,21(5):55504
The influence of low-vacuum helium cold plasma treatment on the rooting percentage, root growth and physiochemical properties of zoysiagrass stolon cuttings was studied. Zoysiagrass stolon cuttings were pre-treated with 0, 100, 200, 300 and 400 W of cold plasma for 15 s. The cold plasma positively stimulated rooting and improved the root growth of the zoysiagrass stolon cuttings, and the 300 W treatment produced the best effect. The rooting percentage and root growth parameters, including the root length, total root surface area, total root volume, average root diameter, and root dry weight, significantly improved in response to the cold plasma treatment. In addition, the water uptake and relative conductivity of the stolon cuttings increased significantly in response to the cold plasma treatment. The results revealed that cold plasma-stimulated rooting and root growth appear to be a consequence of the improvement in permeability and water absorbing capacity of zoysiagrass stolon cuttings. The results of the present study will provide inspiration and support for the application of cold plasma in the vegetative propagation of plants. 相似文献
2.
The effect of different cold plasma treatments on the germination and seedling growth of alfalfa(Medicago sativa L.) seeds under simulated drought stress conditions was investigated.Polyethyleneglycol-6000(PEG 6000)with the mass fraction of 0%(purified water), 5%, 10%,and 15% were applied to simulate the drought environment. The alfalfa seeds were treated with15 different power levels ranged between 0–280 W for 15 s. The germination potential,germination rate, germination index, seedling root length, seedling height, and vigor index were investigated. Results indicated significant differences between treated with proper power and untreated alfalfa seeds. With the increase of treatment power, these indexes mentioned above almost presented bimodal curves. Under the different mass fractions of PEG 6000, results showed that the lower power led to increased germination, and the seedlings presented good adaptability to different drought conditions. Meanwhile, higher power levels resulted in a decreased germination rate. Seeds treated with 40 W resulted in higher germination potential,germination rate, seedling height, root length, and vigor index. Vigor indexes of the treated seeds under different PEG 6000 stresses increased by 38.68%, 43.91%, 74.34%, and 39.20%respectively compared to CK_(0-0), CK_(5-0), CK_(10-0), and CK_(15-0)(the control sample under 0%, 5%,10%, and 15% PEG 6000). Therefore, 40 W was regarded as the best treatment in this research.Although the trend indexes of alfalfa seeds treated with the same power were statistically the same under different PEG 6000 stresses, the cold plasma treatment had a significant effect on the adaptability of alfalfa seeds in different drought environments. Thus, this kind of treatment is worth implementing to promote seed growth under drought situations. 相似文献
3.
Sahar A FADHLALMAWLA Abdel-Aleam H MOHAMED Jamal Q M ALMARASHI et al. 《等离子体科学和技术》2019,21(10):105503-72
The effects of cold atmospheric-pressure plasma jet(CAPPJ) were investigated on germination and early seedling growth of fenugreek(Trigonella foenum-graecum L) seeds.A two-electrode argon CAPPJ system with and without an additional grounded electrode [accelerating grounded(AG) electrode] was used at different exposure times.After 16 h of observation,the germination rates increased by 4 and 7 times,without and with using an AG electrode,respectively,for 1 min of plasma exposure.An increase in shoot fresh weight was observed,especially at 10 min exposure time.A high dry weight of root and shoot at 1 min-AG exposure time was observed.The root:shoot ratio was lower in plasma-treated seedlings,compared with the control plants.The study found that the O-radical emission line(777.4 nm) enhanced 5 times,due to the presence of an AG electrode,which increased the axial electric field and led to the formation of more streamers.The three stated effects(O-radicals,enhancement of the electric field and streamers) could be the cause for the stimulation of seed germination and seedling growth parameters when using the CAPPJ.The scanning electron microscope images showed the etching of the seed surface layers,which was more pronounced when an AG electrode was applied.The results of the current study indicate that the germination rates increased due to the increase of O-radical concentration and the etching of the seed surfaces. 相似文献
4.
With the aim of evaluating the possible impacts of cold plasma on the structure and growth pattern of Capsicum annuum,the current study was carried out.The seeds were exposed to an argon-derived plasma (0.84 W cm-2 surface power densities) for 0,1 or 2 minutes.Plasma treated seeds were grown in the Murashige and Skoog (MS) medium or MS medium supplemented with BA and IAA.The presence of purple stems was recorded in plasma-treated plants grown in the medium supplemented with hormones.The recorded morphological differences were dependent on the exposure time of plasma treatments and/or the presence of hormones in the culture media.Plasma treatment of 1 minute had an improving effect on the shoot and root lengths as well as total leaf area,whereas plasma treatment of 2 minutes had an adverse effect.In contrast to the 1 minute treatment,plasma treatment of 2 minutes significantly impaired growth and hence reduced the total biomass.Alterations in stem diameter and differences in tissue patterns (especially in the vascular system) occurred,and were mainly dependent on the plasma exposure time and/or the presence of hormones.This is a first report on the effects of cold plasma on plant growth in in vitro conditions. 相似文献
5.
This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current (DC) power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications. 相似文献
6.
This study investigated the effect of cold helium plasma treatment on seed germina- tion, growth and yield of wheat. The effects of different power of cold plasma on the germination of treated wheat seeds were studied. We found that the treatment of 80 W could significantly improve seed germination potential （6.0%） and germination rate （6.7%） compared to the control group. Field experiments were carried out for wheat seeds treated with 80 W cold plasma. Com- pared with the control, plant height （20.3%）, root length （9.0%） and fresh weight （21.8%） were improved significantly at seedling stage. At booting stage, plant height, root length, fresh weight, stem diameter, leaf area and leaf thickness of the treated plant were respectively increased by 21.8%, 11.0%, 7.0%, 9.0%, 13.0% and 25.5%. At the same time, the chlorophyll content （9.8%）, nitrogen （10.0%） and moisture content （10.0%） were higher than those of the control, indicating that cold plasma treatment could promote the growth of wheat. The yield of treated wheat was 7.55 t-ha-1, 5.89% more than that of the control. Therefore, our results show that cold plasma has important application prospects for increasing wheat yield. 相似文献
7.
Dongjie CUI Yue YIN Huandong LI Xiaoxia HU Jie ZHUANG Ruonan MA Zhen JIAO 《等离子体科学和技术》2021,23(8):85502-117
8.
The development of surface modification technology for temperature sensitive fibers has been a huge challenge. In this work, a novel technique based on cold plasma treatment was developed for the preparation of anti-bacterial polypropylene (PP) fibers. The results showed that plasma treatment introduced a rough surface and polar groups, which acted as the anchor point and initiators for diallyldimethyl ammonium chloride (DADMAC) graft-polymerization. The fabricated PP membranes presented a high bacterial sterilization rate, as well as excellent adhesion force and washing durability. After ultrasonic treatment for 30 min, the physical coating sample had lost anti-bacterial effect, while the plasma grafted sample still showed a sterilization rate of 91.67%. This work provided a clean and novel DADMAC grafting method and it is also applicable for anti-bacterial material fabrication. 相似文献
9.
When an electromagnetic （EM） wave propagates in an atmospheric pressure plasma （APP） layer, its attenuation depends on the APP parameters such as the layer width, the electron density and its profile and collision frequency between electrons and neutrals. This paper proposes that a combined parameter -the product of the line average electron density n and width d of the APP layer （i.e., the total number of electrons in a unit volume along the wave propagation path） can play a more explicit and decisive role in the wave attenuation than any of the above individual parameters does. The attenuation of the EM wave via the product of n and d with various collision frequencies between electrons and neutrals is presented. 相似文献
10.
This paper presents plasma-induced blood coagulation and its pilot application in rat hepatectomy by using a home-made pulsed cold plasma jet. Experiments were conducted on blood coagulation in vitro, the influence of plasma on tissue in vivo, and the pilot application of rat hepatectomy. Experimental results show that the cold plasma can lead to rapid blood coagulation. Compared with the control sample, the plasma-induced agglomerated layer of blood is thicker and denser, and is mostly composed of broken platelets. When the surface of the liver was treated by plasma, the influence of the plasma can penetrate into the liver to a depth of about 500 μm. During the rat hepatectomy, cold plasma was proved to be effective for stanching bleeding on incision. No obvious bleeding was found in the abdominal cavities of all six rats 48 h after the hepatectomy. This implies that cold plasma can be an effective modality to control bleeding during surgical operation. 相似文献
11.
An argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro.Experimental results showed that,compared with the control cells,the treatment of fibroblasts with 15 s of plasma led to a significant increase of cell viability and collagen synthesis,while the treatment of 25 s plasma resulted in a remarkable decrease.Exploration of related mechanisms suggested that cold plasma could up-regulate Cyclin D1 gene expression and down-regulate p27 gene expression at a low dose,while it could down-regulate Cyclin D1 expression and up-regulate p27 expression at a higher dose,thus altering the cell cycle progression,and then affecting cell viability and collagen synthesis of fibroblasts. 相似文献
12.
The effects of low-vacuum helium cold plasma treatment on the seed germination,plant growth and yield of oilseed rape(Brassica napus L.cv.Zhongshuang 9) were investigated.Seeds were exposed to low-vacuum helium cold plasma ranging from 0–120 W for 15 s.Cold plasma increased the germination,plant growth and yield of oilseed rape,and the treatment of 100 W provided the best result.The germination rate,germination and vigor indices,and uniformity of emergence were improved by cold plasma treatment.Cold plasma raised the relative conductivity and water uptake,and reduced the apparent contact angle.The characteristics of plant growth,including plant height,stem diameter,dry weights of shoot and root at the seedling,bolting and flowering stages were increased by the cold plasma treatment.Yield components,including pod numbers per plant and 1000 seed weights were increased by the cold plasma treatment.Furthermore,the yield per plant increased by 28.20%.These results suggest that cold plasma treatment has the potential to improve the yield of oilseed rape through the enhancement of permeability,wettability and capacity of water uptake of the seeds,seed germination and plant growth. 相似文献
13.
Air cold plasma has been used as a novel method for enhancing microbial fermentation.The aim of this work was to explore the effect of plasma on membrane permeability and the formation of ATP and NADH in Saccharomyces cerevisiae,so as to provide valuable information for largescale application of plasma in the fermentation industry.Suspensions of S.cerevisiae cells were exposed to air cold plasma for 0,1,2,3,4 and 5 min,and then subjected to various analyses prior to fermentation(0h) and at the 9 and 21 h stages of fermentation.Compared with nonexposed cells,cells exposed to plasma for 1 min exhibited a marked increase in cytoplasmic free Ca~(2+) concentration as a result of the significant increase in membrane potential prior to fermentation.At the same time,the ATP level in the cell suspension decreased by about 40%,resulting in a reduction of about 60%in NADH prior to culturing.However,the levels of ATP and NADH in the culture at the 9 and 21 h fermentation stages were different from the level at0 h.Taken together,the results indicated that exposure of S.cerevisiae to air cold plasma could increase its cytoplasmic free Ca~(2+) concentration by improving the cell membrane potential,consequently leading to changes in ATP and NADH levels. 相似文献
14.
Cold atmospheric plasma (CAP) jet has wide applications in various fields including advanced materials synthesis and modifications, biomedicine, environmental protection and energy saving, etc. Appropriate control on the volume, temperature and chemically reactive species concentrations of the CAP jet is of great importance in actual applications. In this paper, an radio-frequency atmospheric-pressure glow discharge (RF-APGD) plasma generator with a hybrid cross-linear-field electrode configuration is proposed. The experimental results show that, with the aid of the copper mesh located at the downstream of the traditional co-axial-type plasma generator with a cross-field electrode configuration, a linear field between the inner powered electrode of the traditional plasma generator and the copper mesh can be established. This liner- field can, to some extent, enhance the discharges at the upstream of the copper mesh, resulting in small increments (all less than 12.5%) of the species emission intensities, electron excitation temperatures and gas temperatures by keeping other parameters being unchanged. And due to the intrinsic transparent and conducting features of the grounded copper mesh to the gas flowing, electric current and heat flux of the plasma plumes, a plasma region with higher concentrations of chemically reactive species and larger plasma plume diameters is obtained at the downstream of the grounded copper mesh on the same level of the gas temperature and electron excitation temperature compared to those of the plasma free jet. In addition, the charged particle number densities at the same downstream axial location of the grounded copper mesh decrease significantly compared to those of the plasma free jet. This means that the copper mesh is also, to some extent, helpful for separating the chemically reactive neutral species from the charged particles inside a plasma environment. The preceding results indicate that the cross-linear-field electrode configuration of the plasma generator is an effective approach for tuning the characteristics of the RF-APGD plasma jet in order to obtain an appropriate combination of the plasma jet properties with higher chemically reactive species concentrations, especially relative higher number densities of neutral species, larger plasma volumes and lower gas temperatures. 相似文献
15.
In this work, N-doped graphite oxide (GO-P) was prepared by cold plasma treatment of GO using a mixture of NH3 and Ar as the working gas. When the ratios of NH3: Ar were 1:2, 1:3, and 1:4, the specific capacitances of the GO-P(NH3: Ar = 1:2), GO-P(NH3: Ar = 1:3), and GO-P(NH3: Ar = 1:4) were 124.5, 187.7, and 134.6 F·g-1, respectively, which were 4.7, 7.1, and 5.1 times that of GO at the current density of 1 A·g-1. The capacitance retention of the GO-P(NH3: Ar = 1:3) was 80% when it was cycled 1000 times. The characterization results showed that the NH3 cold plasma could effectively produce N-doped GO and generate more active defects. The N/C ratio and the contents of pyridinic nitrogen and graphitic nitrogen of the GO-P(NH3: Ar = 1:3) were the highest. These were conducive to providing pseudocapacitance and reducing the internal resistance of the electrode. In addition, the I D/I G of the GO-P(NH3: Ar = 1:3) (1.088) was also the highest, indicating the highest number of defects. The results of discharge parameters measurement and in situ optical emission spectroscopy diagnosis of NH3 plasma showed that the discharge is the strongest when the ratio of NH3: Ar was 1:3, thereby the generated nitrogen active species can effectively promote N-doping. The N-doping and abundant defects were the keys to the excellent electrochemical performance of the GO-P(NH3: Ar = 1:3). NH3 cold plasma is a simple and rapid method to prepare N-doped GO and regulate the N-doping to prepare high-performance supercapacitors. 相似文献
16.
LI Ling 《等离子体科学和技术》2016,18(10):1027-1033
This study explored the effects of cold plasma treatment on seed germination, plant growth, and peanut yield. Cold plasma treatment improved germination and seedling growth,and the 120 W treatment produced the best effect. Germination potential and germination rate were markedly raised by 150% and 21%, respectively. Germination was accelerated and the uniformity of emergence improved. The apparent contact angle was decreased by 53%. Seedling shoot and root dry weights increased by 11% and 9%. Leaf area, leaf thickness, leaf nitrogen concentration, chlorophyll contents, and dry weight at the fruiting stage, together with plant height, stem diameter, and root dry weight at the mature stage were all markedly raised by the cold plasma treatment. The cold plasma treatment enhanced yield components, such as branch numbers per plant, pod numbers per plant, and 100 pod weights by 8%, 13%, and 9%, respectively,compared to the control. Furthermore, the yield improved by 10%. These results suggested that cold plasma treatment improved germination, plant growth, and yield, which might be due to the cold plasma increasing the leaf area, nitrogen concentrations, and chlorophyll contents. 相似文献
17.
18.
为研究氦等离子体在钨表面造成的表面纳米结构,利用荷兰基础能源研究所Pilot-PSI直线等离子体发生装置在673 K温度下,对钨材料进行了低能（40 eV）高束流强度（4×1023 m-2•s-1）氦等离子体辐照。实验结果表明,辐照后钨材料表面出现了多种不同形态的纳米结构,表面纳米结构和晶粒的表面法向之间存在明显关联。在表面法向为［111］的晶粒表面出现三角形的纳米结构,在［110］取向的晶粒表面出现条带状的纳米结构,而在［001］取向的晶粒表面没有明显的结构出现。晶粒表面的纳米结构尺寸在50 nm左右,高度起伏在5 nm以下。另外,氦等离子体辐照会造成晶界处的高度差,在25 nm左右。分析推测氦等离子体辐照造成的晶粒表面和晶界的形貌可能是由近表面的气泡所导致的。 相似文献
19.
The laser speckle interferometry approach provides the possibility of an in situ optical noncontacted measurement for the surface morphology of plasma facing components(PFCs), and the reconstruction image of the PFC surface morphology is computed by a numerical model based on a phase unwrapping algorithm. A remote speckle interferometry measurement at a distance of three meters for real divertor tiles retired from EAST was carried out in the laboratory to simulate a real detection condition on EAST. The preliminary surface morphology of the divertor tiles was well reproduced by the reconstructed geometric image. The feasibility and reliability of this approach for the real-time measurement of PFCs have been demonstrated. 相似文献
20.
K NAVANEETHA PANDIYARAJ D VASU P V A PADMANABHAN M PICHUMANI R R DESHMUKH V KANDAVELU 《等离子体科学和技术》2020,22(5):55504-055504
The intention of this work is to remove Reactive Blue 198(RB-198) dye components from simulated water solution using cold atmospheric pressure argon plasma jet. Aqueous solutions of RB-198 dye were treated as a function of various operating parameters such as applied potential,reaction time and distance between the plasma jet and surface of the liquid. The efficiency of the degradation of RB-198 molecules was explored by means of UV-Vis spectroscopy. The reactive species involved during the treatment process were examined by optical emission spectra(OES).The present hydroxyl radicals(OH·radical) and hydrogen peroxide(H_2O_2) in the plasma-treated aqueous dye solutions were investigated using various spectroscopic techniques. The other parameters such as total organic carbon(TOC), conductivity and p H were also reviewed. The toxicity of plasma-treated RB-198 solution was finally studied by diffusion bacterial analysis and by tracking seed germination processes. The results show that a higher degradation percentage of99.27% was acquired for the RB-198 treated at higher reaction time and applied potential, and shorter distance between the plasma jet and water surface. This may be due to the formation of various reactive oxygen(OH·radical, atomic oxygen(O) and H_2O_2) and nitrogen species(nitric oxide(NO) radicals and N_2 second positive system(N_2 SPS)) during the processes as confirmed by OES analysis and other spectroscopy analysis. TOC(17.7%-81.8%) and pH(7.5-3.4)values of the plasma-treated RB-198 decreased significantly with respect to various operation parameters, which indicates the decomposition of RB-198 molecules in the aqueous solution.Moreover, the conductivity of plasma-treated RB-198 aqueous solutions was found to have increased linearly during the plasma treatment due to the formation of various ionic species in aqueous solution. The toxicity analysis clearly exhibits the non-toxic behavior of plasma-treated RB-198 aqueous solution towards the bacterial growth and germination of seeds. 相似文献