scholarly journals In Situ Investigation of the Formation Kinematics of Plasma-Generated Silver Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 555 ◽  
Author(s):  
Daniel Tasche ◽  
Mirco Weber ◽  
Julia Mrotzek ◽  
Christoph Gerhard ◽  
Stephan Wieneke ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Atmospheric Pressure ◽  
Nanoparticle Synthesis ◽  
Atmospheric Pressure Plasma ◽  
Spherical Particles ◽  
Synthesis Process ◽  
Plasma Exposure ◽  
Pressure Plasma ◽  
In Situ Investigation

In this publication, it is shown how to synthesize silver nanoparticles from silver cations out of aqueous solutions by the use of an atmospheric pressure plasma source. The use of an atmospheric pressure plasma leads to a very fast reduction of silver ions in extensive solvent volumes. In order to investigate the nanoparticle synthesis process, ultraviolet/visible (UV/VIS) absorption spectra were recorded in situ. By using transmission electron microscopy and by the analysis of UV/VIS spectra, the kinetics of silver nanoparticle formation by plasma influence can be seen in more detail. For example, there are two different sections visible in the synthesis during the plasma exposure process. The first section of the synthesis is characterized by a linear formation of small spherical particles of nearly constant size. The second section is predominated by saturation effects. Here, particle faults are increasingly formed, induced by changes in the particle shape and the fusion of those particles. The plasma exposure time, therefore, determines the shape and size distribution of the nanoparticles.

scholarly journals Modulation of Metamorphic and Regenerative Events by Cold Atmospheric Pressure Plasma Exposure in Tadpoles, Xenopus laevis

2019 ◽  
Vol 9 (14) ◽  
pp. 2860 ◽  
Author(s):  
Ma Veronica Holganza ◽  
Adonis Rivie ◽  
Kevin Martus ◽  
Jaishri Menon
Keyword(s):  
Atmospheric Pressure ◽  
Developmental Plasticity ◽  
Morphological Changes ◽  
Atmospheric Pressure Plasma ◽  
Ultrastructural Changes ◽  
Plasma Exposure ◽  
Tail Regeneration ◽  
Developmental Processes ◽  
Pressure Plasma ◽  
Metamorphic Development

Atmospheric pressure plasma has found wide clinical applications including wound healing, tissue regeneration, sterilization, and cancer treatment. Here, we have investigated its effect on developmental processes like metamorphosis and tail regeneration in tadpoles. Plasma exposure hastens the process of tail regeneration but delays metamorphic development. The observed differences in these two developmental processes following plasma exposure are indicative of physiological costs associated with developmental plasticity for their survival. Ultrastructural changes in epidermis and mitochondria in response to the stress of tail amputation and plasma exposure show characteristics of cellular hypoxia and oxidative stress. Mitochondria show morphological changes such as swelling with wide and fewer cristae and seem to undergo processes such as fission and fusion. Complex interactions between calcium, peroxisomes, mitochondria and their pore transition pathways are responsible for changes in mitochondrial structure and function, suggesting the subcellular site of action of plasma in this system.

scholarly journals In Situ Surface Modification of Paper-Based Relics with Atmospheric Pressure Plasma Treatment for Preservation Purposes

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 786
Author(s):  
Xu Yan ◽  
Guo-Sai Liu ◽  
Jing Yang ◽  
Yi Pu ◽  
Shuo Chen ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Good Method ◽  
Contact Angles ◽  
Water Penetration ◽  
Water Contact ◽  
Pressure Plasma ◽  
Static Water

Paper-based relics, which are an important part of cultural heritage worldwide, are at risk of imminent damage from various environmental sources. To protect them, the atmospheric pressure plasma polymerization of hexamethyldisiloxane (HMDSO) precursor has been explored on paper-based relics in situ. The macro and micro images taken during this process suggest that the in situ plasma treatment does not change the macro morphology and the micro structure of the treated paper-based relic samples. On the other hand, plasma treatment causes the polymerization of the HMDSO which then produces nanoparticles deposited onto the paper-based relics. These nanoparticles provide good waterproof properties with large static water contact angles and smaller rolling angles, which protect the paper-based relics from water penetration. Moreover, since the nanoparticles are deposited onto the fibers, waterproof fastness is ensured. Also, the examined mechanical properties of the treated and untreated paper-based relics indicate that the atmospheric pressure plasma treatment does not affect the strength of the paper very much. The results in this study show that atmospheric pressure plasma treatment with the use of HMDSO precursor is a good method to preserve paper-based relics.

scholarly journals Oxidative modification and electrochemical inactivation of Escherichia coli upon cold atmospheric pressure plasma exposure

PLoS ONE ◽  
2017 ◽  
Vol 12 (3) ◽  
pp. e0173618 ◽  
Author(s):  
Marlène Dezest ◽  
Anne-Laure Bulteau ◽  
Damien Quinton ◽  
Laurent Chavatte ◽  
Mickael Le Bechec ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Oxidative Modification ◽  
Plasma Exposure ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma

In situ B-doped Si epitaxial growth at low temperatures by atmospheric-pressure plasma CVD

2008 ◽  
Vol 40 (6-7) ◽  
pp. 984-987 ◽  
Author(s):  
Y. Kirihata ◽  
T. Nomura ◽  
H. Ohmi ◽  
H. Kakiuchi ◽  
K. Yasutake
Keyword(s):  
Epitaxial Growth ◽  
Atmospheric Pressure ◽  
Low Temperatures ◽  
Atmospheric Pressure Plasma ◽  
Plasma Cvd ◽  
Pressure Plasma
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