scholarly journals The Role of Oxygen and Surface Reactions in the Deposition of Silicon Oxide like Films from HMDSO at Atmospheric Pressure

2012 ◽  
Vol 9 (11-12) ◽  
pp. 1116-1124 ◽  
Author(s):  
Rüdiger Reuter ◽  
Katja Rügner ◽  
Dirk Ellerweg ◽  
Teresa de los Arcos ◽  
Achim von Keudell ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Silicon Oxide ◽  
Surface Reactions

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

The role of silicon oxide in the stabilization and magnetoresistance switching of Fe3O4/SiO2/Si heterostructures

2021 ◽  
Vol 271 ◽  
pp. 115248
Author(s):  
Icíar Arnay ◽  
Jesús López-Sánchez ◽  
Eduardo Salas-Colera ◽  
Federico Mompeán ◽  
Adolfo del Campo ◽  
...  
Keyword(s):  
Silicon Oxide

scholarly journals Decoupling of ground level pressures observed in Italian volcanoes: are they driven by space weather geo-effectiveness?

2014 ◽  
Vol 57 (3) ◽  
Author(s):  
Paolo Madonia ◽  
Paolo Romano ◽  
Salvatore Inguaggiato
Keyword(s):  
Space Weather ◽  
Atmospheric Pressure ◽  
Pressure Field ◽  
Ground Level ◽  
Total Solar Irradiance ◽  
Weather Parameters ◽  
Sun Activity ◽  
Fft Analysis ◽  
Sunspot Groups

<p>Investigations on correlation drops between near-ground atmospheric pressures measured at sea level and at higher altitudes on Italian volcanoes have been carried out. We looked for perturbations of the atmospheric pressure field driven by volcanic activity, but not excluding possible external triggers for the observed anomalies. Decorrelations between atmospheric pressures measured at Stromboli Island in stations located at different altitudes (years 2002-10) have been analysed and compared with data from other volcanic (Vesuvius) and non volcanic (Mt. Soro) orographic structures. We investigated as their possible triggers volcanic, meteorological and space weather parameters, with particular attention to Total Solar Irradiance (TSI), Kp index and Forbush decreases. Pressure decorrelations seems to be driven by astronomic cycles, with maxima in summer and minima in winter. A further contribution was found, seemingly assignable to TSI anomalies, with correlation minima occurring 12 hours after these but only during phases of high Sun activity. Moreover, during the same phases a main periodicity of about 27 days in pressure decorrelations was revealed by FFT analysis. This period is the same of the Sun Carrington rotation, expressing the periodic reappearance of sunspot groups on Sun’s surface. The strong similarity between recurrences of sunspot number and atmospheric pressure anomalies further supports the role of the former as a possible trigger for the latter.</p>

scholarly journals The influence of argon gas flow in the killing of staphylococcus epidermidis bacteria

2018 ◽  
Vol 16 (36) ◽  
pp. 134-139
Author(s):  
Ahmed Mahmoud Shihab
Keyword(s):  
Staphylococcus Epidermidis ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Biotechnological Applications ◽  
Plasma System ◽  
Argon Gas ◽  
Killing Rate ◽  
Normal Atmospheric Pressure ◽  
Non Thermal Plasma

In this research, non-thermal plasma system of argon gas is designed to work at normal atmospheric pressure and suitable for work in medical and biotechnological applications. This technique is applied in the treatment of the Staphylococcus epidermidis bacteria and show the role of the flow rate of Argon gas on the killing rate of bacteria, and it obtained a 100 % killing rate during the time of 5 minutes at the flow Argon gas of 5 liters/ min.

Application of atmospheric pressure plasma polymerization for soil guard finishing of textiles

2017 ◽  
Vol 88 (11) ◽  
pp. 1278-1289 ◽  
Author(s):  
Keiko Gotoh ◽  
Eriko Shohbuke ◽  
Gyohni Ryu
Keyword(s):  
Atmospheric Pressure ◽  
Ethylene Terephthalate ◽  
Silicon Oxide ◽  
Atmospheric Pressure Plasma ◽  
Fiber Surface ◽  
Water Repellency ◽  
Red Clay ◽  
Pressure Plasma ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Surface coating by atmospheric pressure plasma jet (APPJ) polymerization was employed to achieve soil guard protection of textiles. Hexamethyldisiloxane was chosen as a precursor for depositing silicon oxide layers on the fiber surface. Plain-woven polyester and rayon filament fabrics and a geometrically simple poly (ethylene terephthalate) film were used as substrates, which were treated by the APPJ polymerization and by the commonly used two fluorochemical resins for comparison. The samples subjected to the APPJ polymerization showed superior water repellency as compared to the resin-treated samples. Interestingly, the APPJ polymerization provided oleophobicity to diiodomethane and oleophilicity to hexadecane. The deposition of model particulate soils, carbon black and red clay, on the fabrics and the film was evaluated by the surface reflectance method and by microscope image analysis, respectively. It was found that the APPJ polymerization remarkably prevented soil deposition as compared to the treatment with two fluorochemical resins. Contrary to our expectations, the APPJ polymerization did not significantly affect the removal of the particulate soils from the substrates by aqueous cleaning.

scholarly journals The Role of H2:N2 Ratio on the NH3 Synthesis Rate and on Process Economics over the Co3Mo3N Catalyst

2020 ◽  
Author(s):  
Mustafa Yasin Aslan ◽  
Justin Hargreaves ◽  
Deniz Uner
Keyword(s):  
Atmospheric Pressure ◽  
Ammonia Synthesis ◽  
Synthesis Rate ◽  
Process Economics

In this study, the process economics of ammonia synthesis over Co3Mo3N was investigated by searching an optimum feed stoichiometry. By ammonia synthesis rate measurements at atmospheric pressure and 400 oC...

The role of silane and N2O in the CO2 laser-CVD of silicon oxide films

1993 ◽  
Vol 69 (1-4) ◽  
pp. 281-284
Author(s):  
D. Fernández ◽  
P. González ◽  
J. Pou ◽  
E. García ◽  
J. Serra ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Silicon Oxide ◽  
Oxide Films ◽  
Laser Cvd
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