scholarly journals Atmospheric plasma jet device for versatile electron microscope grid treatment

2021 ◽  
Author(s):  
Eungjin Ahn ◽  
Tianyu Tang ◽  
Byungchul Kim ◽  
Hae June Lee ◽  
Uhn-Soo Cho
Keyword(s):  
Surface Modification ◽  
Plasma Jet ◽  
Cost Effective ◽  
Atmospheric Plasma ◽  
Negative Stain ◽  
Surface Contaminants ◽  
Electron Microscope Grid ◽  
Potential Applications ◽  
Biomedical Treatment ◽  
Grid Surface

Atmospheric pressure plasmas have been widely applied in surface modification and biomedical treatment due to its ability to generate highly reactive radicals and charged particles. In cryogenic electron microscopy (cryo-EM), plasmas have been used in eliminating the surface contaminants as well as generating the hydrophilic surface to embed the specimen on grids. Particularly, plasma treatment is a prerequisite for negative stain and quantifoil grids,which are coated with hydrophobic carbon on the grid surface. Here we introduce a nonthermal atmospheric plasma jet system as an alternative new tool for surface treatment. Unlike the conventional glow discharger, we found that the plasma jet system successfully cleans the grid surface and introduces hydrophilicity on grids in the ambient environment without introducing a vacuum. Therefore, we anticipate the plasma jet system will be beneficial in many aspects, such as cost-effective, convenient, versatile, and potential applications in surface modification for both negative stain and cryo-EM grid treatment.

scholarly journals Surface modification of polymeric materials by cold atmospheric plasma jet

2014 ◽  
Vol 314 ◽  
pp. 367-375 ◽  
Author(s):  
K.G. Kostov ◽  
T.M.C. Nishime ◽  
A.H.R. Castro ◽  
A. Toth ◽  
L.R.O. Hein
Keyword(s):  
Surface Modification ◽  
Polymeric Materials ◽  
Plasma Jet ◽  
Atmospheric Plasma ◽  
Cold Atmospheric Plasma

scholarly journals USE OF ATMOSPHERIC PLASMA IN GERMINATION OF Hybanthus calceolaria (L.) Schulze-Menz SEEDS

2018 ◽  
Vol 31 (3) ◽  
pp. 632-639 ◽  
Author(s):  
DINNARA LAYZA SOUZA DA SILVA ◽  
MIKELLY DE LIMA FARIAS ◽  
JUSSIER DE OLIVEIRA VITORIANO ◽  
CLODOMIRO ALVES JÚNIOR ◽  
SALVADOR BARROS TORRES
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Plasma Jet ◽  
Cost Effective ◽  
Atmospheric Plasma ◽  
Helium Plasma ◽  
Application Time ◽  
Plasma Technology ◽  
Dielectric Barrier ◽  
Weight Variation

ABSTRACT Plasma technology is a fast, cost-effective, and pollution-free method that can be used in place of conventional methods to overcome seed dormancy. The goal of the present study was to determine the effect of different application times of atmospheric plasma on soaking and germination of Hybanthus calceolaria seeds in order to accelerate these processes. Helium plasma jet produced by dielectric barrier discharge was used to treat H. calceolaria seeds with applications of 1, 5, and 10 minutes. The treated seeds were characterized considering their weight variation during soaking, changes in electrical conductivity, and pH. It was found that germination depended on the plasma application time. The treatment of H. calceolaria seeds with atmospheric plasma for 1 minute provided 3.5 times greater germination in comparison to untreated seeds. Atmospheric plasma technology obtained by dielectric barrier discharge had potential of being used as a germination accelerant in H. calceolaria seeds. The treatment of H. calceolaria seeds using atmospheric plasma for 1 minute favored germination.

scholarly journals Killing of adherent oral microbes by a non-thermal atmospheric plasma jet

2010 ◽  
Vol 59 (2) ◽  
pp. 206-212 ◽  
Author(s):  
Stefan Rupf ◽  
Antje Lehmann ◽  
Matthias Hannig ◽  
Barbara Schäfer ◽  
Andreas Schubert ◽  
...  
Keyword(s):  
Plasma Jet ◽  
Plasma Jets ◽  
Atmospheric Plasma ◽  
Killing Effect ◽  
E Coli ◽  
Potential Applications ◽  
Oral Microbes ◽  
Micro Organisms

Atmospheric plasma jets are being intensively studied with respect to potential applications in medicine. The aim of this in vitro study was to test a microwave-powered non-thermal atmospheric plasma jet for its antimicrobial efficacy against adherent oral micro-organisms. Agar plates and dentin slices were inoculated with 6 log10 c.f.u. cm−2 of Lactobacillus casei, Streptococcus mutans and Candida albicans, with Escherichia coli as a control. Areas of 1 cm2 on the agar plates or the complete dentin slices were irradiated with a helium plasma jet for 0.3, 0.6 or 0.9 s mm−2, respectively. The agar plates were incubated at 37 °C, and dentin slices were vortexed in liquid media and suspensions were placed on agar plates. The killing efficacy of the plasma jet was assessed by counting the number of c.f.u. on the irradiated areas of the agar plates, as well as by determination of the number of c.f.u. recovered from dentin slices. A microbe-killing effect was found on the irradiated parts of the agar plates for L. casei, S. mutans, C. albicans and E. coli. The plasma-jet treatment reduced the c.f.u. by 3–4 log10 intervals on the dentin slices in comparison to recovery rates from untreated controls. The microbe-killing effect was correlated with increasing irradiation times. Thus, non-thermal atmospheric plasma jets could be used for the disinfection of dental surfaces.

Study on Surface Modification of Polymer Films by Using Atmospheric Plasma Jet Source

2008 ◽  
Vol 47 (7) ◽  
pp. 5644-5647 ◽  
Author(s):  
Yuichiro Takemura ◽  
Naohiro Yamaguchi ◽  
Tamio Hara
Keyword(s):  
Surface Modification ◽  
Polymer Films ◽  
Plasma Jet ◽  
Atmospheric Plasma

Properties and Applications of Modified Bacterial Cellulose-Based Materials

2020 ◽  
Vol 16 ◽  
Author(s):  
Munair Badshah ◽  
Hanif Ullah ◽  
Fazli Wahid ◽  
Taous Khan
Keyword(s):  
Surface Modification ◽  
Bacterial Cellulose ◽  
Degree Of Polymerization ◽  
Biomedical Science ◽  
Hydroxyl Groups ◽  
Market Demand ◽  
Ideal Candidate ◽  
Fibrous Network ◽  
Potential Applications ◽  
Surface Modification Techniques

Background: Bacterial cellulose (BC) is purest form of cellulose as it is free from pactin, lignin, hemicellulose and other active constituents associated with cellulose derived from plant sources. High biocompatibility and easy molding into desired shape make BC an ideal candidate for applications in biomedical field such as tissue engineering, wound healing and bone regeneration. In addition to this, BC has been widely studied for applications in the delivery of proteins and drugs in various forms via different routes. However, BC lacks therapeutic properties and resistance to free movement of small molecules i.e., gases and solvents. Therefore, modification of BC is required to meet the research ad market demand. Methods: We have searched the updated data relevant to as-synthesized and modified BC, properties and applications in various fields using Web of science, Science direct, Google and PubMed. Results: As-synthesized BC possesses properties such as high crystallinity, well organized fibrous network, higher degree of polymerization, and ability of being produced in swollen form. The large surface area with abundance of free accessible hydroxyl groups makes BC an ideal candidate for carrying out surface functionalization to enhance its features. The various reported surface modification techniques including, but not limited to, are amination, methylation and acetylation. Conclusion: In this review, we have highlighted various approaches made for BC surface modification. We have also reported enhancement in the properties of modified BC and potential applications in different fields ranging from biomedical science to drug delivery and paper-making to various electronic devices.

Activation of deionized water by atmospheric plasma jet in helium gas flow

2021 ◽  
Author(s):  
P. Y. Tan ◽  
O. H. Chin ◽  
R. Anpalagan ◽  
Y. T. Lau ◽  
H. C. Lee
Keyword(s):  
Gas Flow ◽  
Plasma Jet ◽  
Deionized Water ◽  
Atmospheric Plasma ◽  
Helium Gas

scholarly journals Tiny Cold Atmospheric Plasma Jet for Biomedical Applications

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 249
Author(s):  
Zhitong Chen ◽  
Richard Obenchain ◽  
Richard E. Wirz
Keyword(s):  
Biomedical Applications ◽  
Plasma Jet ◽  
Discharge Voltage ◽  
Plasma Jets ◽  
Atmospheric Plasma ◽  
Physical Parameters ◽  
Cold Atmospheric Plasma ◽  
Water Metal ◽  
Plasma Probe ◽  
Jet Nozzle

Conventional plasma jets for biomedical applications tend to have several drawbacks, such as high voltages, high gas delivery, large plasma probe volume, and the formation of discharge within the organ. Therefore, it is challenging to employ these jets inside a living organism’s body. Thus, we developed a single-electrode tiny plasma jet and evaluated its use for clinical biomedical applications. We investigated the effect of voltage input and flow rate on the jet length and studied the physical parameters of the plasma jet, including discharge voltage, average gas and subject temperature, and optical emissions via spectroscopy (OES). The interactions between the tiny plasma jet and five subjects (de-ionized (DI) water, metal, cardboard, pork belly, and pork muscle) were studied at distances of 10 mm and 15 mm from the jet nozzle. The results showed that the tiny plasma jet caused no damage or burning of tissues, and the ROS/RNS (reactive oxygen/nitrogen species) intensity increased when the distance was lowered from 15 mm to 10 mm. These initial observations establish the tiny plasma jet device as a potentially useful tool in clinical biomedical applications.

Sterilization of bacillus subtilis spores using an atmospheric plasma jet

2012 ◽  
Author(s):  
Jie Shen ◽  
Cheng Cheng ◽  
Shidong Fang ◽  
Hongbing Xie ◽  
Longwei Cheng ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Plasma Jet ◽  
Atmospheric Plasma

scholarly journals Black Phosphorus-Molybdenum Disulfide Hetero-Junctions Formed with Ink-Jet Printing for Potential Solar Cell Applications with Indium-Tin-Oxide

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 560
Author(s):  
Ravindra Ketan Mehta ◽  
Anupama Bhat Kaul
Keyword(s):  
Electrical Properties ◽  
Molybdenum Disulfide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Cost Effective ◽  
Contact Materials ◽  
Ito Glass ◽  
The Future ◽  
Potential Applications ◽  
Jet Printing

In this work, we implemented liquid exfoliation to inkjet-print two-dimensional (2D) black phosphorous (BP) and molybdenum disulfide (MoS2) p–n heterojunctions on a standard indium tin oxide (ITO) glass substrate in a vertical architecture. We also compared the optical and electrical properties of the inkjet-printed BP layer with that of the MoS2 and the electrical properties of the mechanically exfoliated MoS2 with that of the inkjet-printed MoS2. We found significant differences in the optical characteristics of the inkjet-printed BP and MoS2 layers attributed to the differences in their underlying crystal structure. The newly demonstrated liquid exfoliated and inkjet-printed BP–MoS2 2D p–n junction was also compared with previous reports where mechanically exfoliated BP–MoS2 2D p–n junction were used. The electronic transport properties of mechanically exfoliated MoS2 membranes are typically better compared to inkjet-printed structures but inkjet printing offers a cost-effective and quicker way to fabricate heterostructures easily. In the future, the performance of inkjet-printed structures can be further improved by employing suitable contact materials, amongst other factors such as modifying the solvent chemistries. The architecture reported in this work has potential applications towards building solar cells with solution processed 2D materials in the future.

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