Engraving

About: Engraving is a research topic. Over the lifetime, 3711 publications have been published within this topic receiving 16758 citations. The topic is also known as: engraving technique & engraving (activity).

Anisotropic Etching of Silicon

Abstract: A ternary liquid etchant solution for silicon, consisting of hydrazine, iso‐2‐propyl alcohol (IPA), and water has been studied in some detail. In common with other anisotropic etchants reported in the literature, marked dependence of dissolution rate on the crystal orientation of the etched surface has been observed with a low rate of attack on (111) planes. In contrast to other formulations, this etch attacks neither silicon dioxide nor aluminium vacuum‐deposited films, either of which may be used as a very convenient in‐contact masking medium for the engraving of intricate shapes on an appropriately oriented silicon substrate. The experimental study indicates that the etch velocity is a maximum for (211) planes, which accounts for the rounding of convex corners frequently observed when engraving regular shapes in silicon with anisotropic etches. The optimum etch solution is an equimolar mixture of NH2 and H2O.

Controllable Surface Reorganization Engineering on Cobalt Phosphide Nanowire Arrays for Efficient Alkaline Hydrogen Evolution Reaction.

Abstract: Developing highly efficient hydrogen evolution reaction (HER) catalysts in alkaline media is considered significant and valuable for water splitting. Herein, it is demonstrated that surface reorganization engineering by oxygen plasma engraving on electocatalysts successfully realizes a dramatically enhanced alkaline HER activity. Taking CoP nanowire arrays grown on carbon cloth (denoted as CoP NWs/CC) as an example, the oxygen plasma engraving can trigger moderate CoOx species formation on the surface of the CoP NWs/CC, which is visually verified by the X-ray absorption fine structure, high-resolution transmission electron microscopy, and energy-dispersive spectrometer (EDS) mapping. Benefiting from the moderate CoOx species formed on the surface, which can promote the water dissociation in alkaline HER, the surface reorganization of the CoP NWs/CC realizes almost fourfold enhanced alkaline HER activity and a 180 mV decreased overpotential at 100 mA cm-2 , compared with the pristine ones. More interestingly, this surface reorganization strategy by oxygen plasma engraving can also be effective to other electrocatalysts such as free-standing CoP, Co4 N, O-CoSe2 , and C-CoSe2 nanowires, which verifies the universality of the strategy. This work thus opens up new avenues for designing alkaline HER electrocatalysts based on oxygen plasma engraving.

Digital facial engraving

Abstract: This contribution introduces the basic techniques for digital facial engraving, which imitates traditional copperplate engraving Inspired by traditional techniques, we first establish a set of basic rules thanks to which separate engraving layers are built on the top of the original photo Separate layers are merged according to simple merging rules and according to range shift/scale masks specially introduced for this purpose We illustrate the introduced technique by a set of black/white and color engravings, showing different features such as engraving-specific image enhancements, mixing different regular engraving lines with mezzotint, irregular perturbations of engraving lines etc We introduce the notion of engraving style which comprises a set of separate engraving layers together with a set of associated range shift/scale masks The engraving style helps to port the look and feel of one engraving to another Once different libraries of pre-defined mappable engraving styles and an appropriate user interface are added to the basic system, producing a decent gravure starting from a simple digital photo will be a matter of seconds The engraving technique described in this contribution opens new perspectives for digital art, adding unprecedented power and precision to the engraver's work