Organic Contaminant Sorption and Diffusion in Engineered Clays with Organoclay Additives-Understanding Barrier Performance at the Molecular Level

2014 ◽  
Author(s):  
Qian Zhao ◽  
Susan E. Burns ◽  
Thomas D. Rockaway
Keyword(s):  
Molecular Level ◽  
Organic Contaminant ◽  
Barrier Performance ◽  
And Diffusion

Computer Simulation of Xe adsorption in Zeolite Y

1996 ◽  
Vol 431 ◽  
Author(s):  
Vishwas Gupta ◽  
H. Ted Davis ◽  
Alon V. McCormick
Keyword(s):  
Crystal Structure ◽  
Computer Simulation ◽  
Computer Modeling ◽  
Potential Field ◽  
Molecular Level ◽  
Zeolite Y ◽  
Strong Link ◽  
Adsorption Sites ◽  
Commercially Important ◽  
And Diffusion

AbstractComputer modeling of fluids in zeolites can provide a detailed molecular level understanding of the process of adsorption and diffusion under the influence of the 3-D potential field and the confinement offered by the crystal structure. We have shown that there is a strong link between the location, geometry and energetics of sites and the observed thermodynamics and spectroscopy of the adsorbates. Here we report on the modeling of Xe in zeolite Y, which is of interest both because it is commercially important and because it offers two distinct adsorption sites.

Effect of Si in reactively sputtered Ti-Si-N films on structure and diffusion barrier performance

1997 ◽  
Vol 65 (1) ◽  
pp. 43-45 ◽  
Author(s):  
X. Sun ◽  
E. Kolawa ◽  
S. Im ◽  
C. Garland ◽  
M.-A. Nicolet
Keyword(s):  
Diffusion Barrier ◽  
Barrier Performance ◽  
And Diffusion

scholarly journals Mechanical Properties and Diffusion Barrier Performance of CrWN Coatings Fabricated through Hybrid HiPIMS/RFMS

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 690
Author(s):  
Li-Chun Chang ◽  
Cheng-En Wu ◽  
Tzu-Yu Ou
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Diffusion Barrier ◽  
Scratch Resistance ◽  
Face Centered Cubic ◽  
Cu Metallization ◽  
Barrier Performance ◽  
Face Centered ◽  
And Diffusion ◽  
Hardness Values

CrWN coatings were fabricated through a hybrid high-power impulse magnetron sputtering/radio-frequency magnetron sputtering technique. The phase structures, mechanical properties, and tribological characteristics of CrWN coatings prepared with various nitrogen flow ratios (fN2s) were investigated. The results indicated that the CrWN coatings prepared at fN2 levels of 0.1 and 0.2 exhibited a Cr2N phase, whereas the coatings prepared at fN2 levels of 0.3 and 0.4 exhibited a CrN phase. These CrWN coatings exhibited hardness values of 16.7–20.2 GPa and Young’s modulus levels of 268–296 GPa, which indicated higher mechanical properties than those of coatings with similar residual stresses prepared through conventional direct current magnetron sputtering. Face-centered cubic (fcc) Cr51W2N47 coatings with a residual stress of −0.53 GPa exhibited the highest wear and scratch resistance. Furthermore, the diffusion barrier performance of fcc CrWN films on Cu metallization was explored, and they exhibited excellent barrier characteristics up to 650 °C.

Direct micro-scale monitoring of molecular aggregation, its growth and diffusion via aggregation-induced emission

Soft Matter ◽  
2020 ◽  
Vol 16 (11) ◽  
pp. 2664-2668
Author(s):  
Mane Jyothi ◽  
Mari Annadhasan ◽  
Vuppu Vinay Pradeep ◽  
Rajadurai Chandrasekar
Keyword(s):  
Model Compound ◽  
Molecular Level ◽  
Time Dependent ◽  
Molecular Aggregation ◽  
Aggregation Induced Emission ◽  
Micro Scale ◽  
Diffusion Dynamics ◽  
And Diffusion

Time-dependent monitoring of aggregation-induced fluorescence of a model compound unearth hitherto unknown molecular level events such as the onset of molecular aggregation, their growth, size, and diffusion dynamics.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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