In addition to meeting the requirements of ultra high purity bulk gas distribution systems, the distribution of specialty and corrosive gases necessitates that the gas distribution system is corrosion resistant and does not exhibit any catalytic behavior. Vereecke1 and coworkers reported that reaction between reactive gases and materials of construction employed in gas delivery systems can resu...

The density functional theory (DFT) model ONIOM(M06L/6-311++G(2df,2p):UFF was employed to reveal the catalytic activity of Cu(II) in the paddle-wheel unit of the metal-organic framework (MOF)-505 material in the Mukaiyama aldol reaction compared with the activity of Cu-ZSM-5 zeolites. The aldol reaction between a silyl enol ether and formaldehyde catalyzed by the Lewis acidic site of both mater...

Nitric oxide (NO) oxidation occurs spontaneously in aerobic environments and potentiates the detrimental effects of NO production in the body. This autoxidation reaction can form reactive nitrogen oxygen species, capable of oxidizing and nitrosating proteins, lipids, and DNA, potentially leading to tissue damage, disease, and cancer. Autoxidation of NO in the gas phase is well-characterized, an...

X-ray photoelectron spectroscopy ~XPS! and Auger electron spectroscopy ~AES! were used to identify gas reaction layers and tribochemical films formed during reciprocating sliding tests in an ultrahigh vacuum ~UHV! tribometer. Tests were performed on UHV cleaned SiC pins and Mo flats during or after exposure to SO2 , O2 , or H2S gas at pressures around 40 Pa. XPS identified the gas reaction laye...

in this research, the effect of catalyst type on the cnts synthesis was investigated. the carbonnanotubes (cnts) were produced on stainless steel substrates and two of catalyst with differentcharacteristics by using thermal chemical vapor deposition (tcvd) method. the catalysts have theimportant role for the growth carbon nanotubes (cnts). acetylene gas (c2h2) diluted by nh3 wasused as the reac...

carbon nanotubes (cnts), nowadays, are one of the important nanomaterials that can be produce with different methods such as chemical vapor deposition (cvd). growing of cnts via cvd method can be influenced by several operating parameters that can affect their quality and quantity. in this article, the effects of inlet gas mixture temperature on cnt’s local growth rate, total production, and le...

Desorption of a component from a gas mixture being injected through a submerged nozzle, during the bubble formation stage, is tlieoretically studied. The solute is assumed to suffer an instantaneous reaction on the liquid side, the reaction plane being on the liquid/gas interface. The volume elements on the gas bubble are assumed to result from a forced surface renewal coupled with a natural su...

Deposition rates, wet etch rates, and thickness uniformity experiments were performed using O3/TEOS thermal chemical-vapor deposition. Our results for oxide deposition show optimum process window around 200 Torr for producing films of good quality ~uniformity and material properties!. This is in excellent agreement with the modeling predictions over a broad range of pressure ~100–600 Torr! and ...

The CAMP reaction is a synergistic lysis of erythrocytes by the interaction of an extracellular protein (CAMP factor) produced by some streptococcal species with the Staphylococcus aureus sphingomyelinase C (beta-toxin). Group A streptococci (GAS [Streptococcus pyogenes]) have been long considered CAMP negative, and this reaction commonly has been used to distinguish GAS from Streptococcus agal...

A rise in CO2 and other greenhouse gases’ concentration from gas refinery flares and furnaces in the atmosphere causes environmental problems. In this work, a new process was designed to use waste gas (flue gas and flare gas) of a domestic gas refinery to produce pure hydrogen in a membrane reactor. In particular, the process foresees that the energy and CO2 content of flue gas can provide the ...