1. Holey Silicon fabrication The HS ribbons used for transport measurements are patterned by optical lithography and then released from SOI substrate (Soitec Inc.) by hydrofluoric acid vapor etching. The SOI wafer consists 100 nm device layer (<100>, 14-22 Ω·cm, phosphorus doped) with 200 nm buried oxide layer. Holey structure is fabricated by DRIE through thin chromium mask (~5 nm) converted f...

Zinc coating is formed by the heterogeneous assembly of the Γ, Γ1, δ, ζ and η phases whose mechanical properties greatly differ from each other. Thermal strains resulting from large differences between thermal expansion coefficients are partially relaxed by the formation of a crack network. In order to model this phenomenon, initial hardness, thermal expansion coefficient αi and toughness (KIC)...

The manufacture of medical and aerospace components made of titanium alloys and other difficult-to-cut materials requires the parallel development of high performance cutting tools coated with materials capable of enhanced tribological and resistance properties. In this matter, a thin nanocomposite film made out of AlCrN (aluminum-chromium-nitride) was studied in this research, showing experime...

Functionally graded NiCoCrAlY/yttria-stabilized zirconia coatings were fabricated by plasma spraying using mechanically alloyed, plasma-spheroidized NiCoCrAlY/yttria-stabilized zirconia (YSZ) composite powders. Scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS) analysis revealed that oxidation of aluminum, chromium and yttrium in the NiCoCrAlY alloy occurred in th...

Fatigue-crack-growth (FCG) rate tests were conducted on compact specimens made of an Inconel-718 alloy to study the behavior over a wide range in load ratios (0.1 6 R 6 0.95) and a constant Kmax test condition. Previous research had indicated that high R (>0.7) and constant Kmax test conditions near threshold conditions were suspected to be crack-closure-free and that any differences were attri...

The chromium (III) metformin hydrochloride complex as a diabetic drug model was synthesised by the chemical reaction between chromium (III) chloride hexahydrateand metforminHCl (Mfn.HCl) in methanol solvent. The [Cr(Mfn-HCl)2(Cl)2].Cl.6H2O complex was characterized using microanalytical measurements, molar conductance, spectroscopic (infrared, and UV-vis.), effective magnetic moment, and therma...

Phase separated films with controlled porosity were made from ethyl cellulose (EC) and 30% w/w hydroxypropyl cellulose (HPC). The molecular weight of EC can be used to modify the mass transfer rate through coatings by effects on microstructure of the film. Processing conditions are, however, affected by the solution rheology, which could influence the film quality when using different molecular...