The Interrelation of Synthesis Conditions and Wettability Properties of the Porous Anodic Alumina Membranes

Abstract

The results of studies on the wettability properties and preparation of porous anodic alumina (PAA) membranes with a 3.3 ± 0.2 μm thickness and a variety of pore sizes are presented in this article. The wettability feature results, as well as the fabrication processing characteristics and morphology, are presented. The microstructure effect of these surfaces on wettability properties is analyzed in comparison to outer PAA surfaces. The interfacial contact angle was measured for amorphous PAA membranes as-fabricated and after a modification technique (pore widening), with pore sizes ranging from 20 to 130 nm. Different surface morphologies of such alumina can be obtained by adjusting synthesis conditions, which allows the surface properties to change from hydrophilic (contact angle is approximately 13°) to hydrophobic (contact angle is 100°). This research could propose a new method for designing functional surfaces with tunable wettability. The potential applications of ordinary alumina as multifunctional films are demonstrated.

First principles calculation to investigate the effect of Mn substitution on Cu site in CeCu3−xMnxV4O12 (x = 0, 1, 2 and 3) system

“…The technique illustrated by Dudarev et al 73 deal with the electronic correlation effect on Ce-f, Mn, Cu and V-d orbital's. According to the literature, 26,74,75 the effective U value chosen to be 4 eV per Ce, 4 eV per Mn, 5 eV per Cu and 2 eV per V respectively and the exact exchange a for Ce is 0.35 eV is used throughout the calculation. The interstitial region is extended on a plane wave basis with K max = 6/R MT as the cut-off value, the wave function is ubiquitous in the spherical harmonics contained within the muffin-tin spheres, which together make up the unit cell of the FPLAPW technique.…”

“…The technique illustrated by Dudarev et al 73 deal with the electronic correlation effect on Ce-f, Mn, Cu and V-d orbital's. According to the literature, 26,74,75 the effective U value chosen to be 4 eV per Ce, 4 eV per Mn, 5 eV per Cu and 2 eV per V respectively and the exact exchange α for Ce is 0.35 eV is used throughout the calculation.…”

High-Resolution Scanning Electron Microscopy Imaging to Understand the Growth Kinetics of Nickel Nanorods

“…Nanowires and nanotubes are promising materials for futuristic devices due to their exceptional electronic, magnetic, optoelectronic, and mechanical properties . The nanowires impregnated inside porous templates have potential applications such as magnetic storage materials, charge storage nanocapacitors, optoelectronic devices, magnetic sensors, high-frequency switches, logic devices, microwave devices, spin waveguides, spin pumping aides, high hardness coating materials for tribological applications, and so forth. − Muthukumar et al observed friction and wear behavior of nanocomposite coatings where copper nanorods are impregnated in ordered nanoporous alumina (NPA). Improved wear resistance is observed for NPA with copper phase compared to NPA during dry reciprocating friction test.…”

High Crystallinity Vertical Few-Layer Graphene Grown Using Template Method Assisted ICPCVD Approach

“…Yue Qi et al use copper (Cu) foam as a template reducing ions etching and shielding the electrical field to synthesize flat graphene on a glass substrate by plasma-enhanced chemical vapor deposition [ 16 ]. D. I. Tishkevich et al demonstrated template-assisted method is an efficient way to improve the wettability property of aluminum and can protect deposited Ti/Al 2 O 3 /Ni composite material avoiding corrosion [ 17 , 18 ]. Controllable gas flow and etching are two efficient ways to realize high crystallinity VFLG synthesis.…”