Formation of Nb2O5 Hollow Architectures by Selective Etching Process

2012 ◽  
Vol 2 (4) ◽  
pp. 410-414
Author(s):  
Fei Liu ◽  
Xin Zhang ◽  
Dongfeng Xue
Keyword(s):  
Selective Etching ◽  
Etching Process

scholarly journals Selective etching of 10 MHz repetition rate fs-laser inscribed tracks in YAG

2021 ◽  
Vol 255 ◽  
pp. 10003
Author(s):  
Kore Hasse ◽  
Detlef Kip ◽  
Christian Kränkel
Keyword(s):  
Aspect Ratio ◽  
Repetition Rate ◽  
Laser System ◽  
Selective Etching ◽  
Etching Process ◽  
Acid Mixture ◽  
Laser Structuring ◽  
Order Of Magnitude ◽  
Fs Laser

We investigated fs-laser structuring of YAG crystals at high writing velocities up to 100 mm/s using a commercial 10 MHz fs-laser system supplied by Coherent Inc. and selective etching of these structures for fabrication of ultrahigh aspect ratio microchannels. Usage of a diluted acid mixture of 22% H3PO4 and 24% H2SO4 accelerated the etching process significantly to an etching parameter D of 11.2 μm2/s, which is three times higher than previously reported. Additionally, the selectivity of the etching process was increased by an order of magnitude.

Selective Etching of Pressure-Crystallized Bisphenol-A Polycarbonate by Dimethylacetamide at Room Temperature

2012 ◽  
Vol 430-432 ◽  
pp. 66-69 ◽  
Author(s):  
Jun Lu ◽  
Rui Huang
Keyword(s):  
Bisphenol A ◽  
Room Temperature ◽  
Hierarchical Structures ◽  
Hydrophobic Surface ◽  
Dioctyl Phthalate ◽  
Selective Etching ◽  
Etching Process ◽  
Bisphenol A Polycarbonate ◽  
Etching Technique ◽  
Fracture Surfaces

The high-pressure crystallized bisphenol-A polycarbonate (BAPC) and BAPC / dioctyl phthalate (DOP) blend samples were prepared in a piston-cylinder apparatus, and the recovered specimens were investigated using scanning electron microscopy (SEM). As for the fracture surfaces without etching technique applied, the detailed information of the crystal morphologies of BAPC was not shown, though the outlines of such aggregations as spherulites and cylindrulite were still exposed due to the high-temperature degradation during the long time crystallization. However, the delicate internal structures of these aggregates were revealed clearly by the introduction of a facile etching method. The used etchant, dimethylacetamide, was capable of dissolving only amorphous, but not crystalline BAPC at room temperature. With the employed selective etching technique, BAPC spherulites with fine structures and different characteristics were observed. Spatial dendrites of the polymer were also disclosed in BAPC samples plasticized with DOP after a deep etching process. Furthermore, by controlling the etching process, unique hierarchical structures, composed of nano-structured micrometer-sized crystalline entities of BAPC, was created on the fracture surfaces. The study presented here suggested that selective etching is a more effective route to reveal the inner structures of polymer crystals, as well as to fabricate new surface active materials, such as a super-hydrophobic surface with self-cleaning effect.

Facile large-scale synthesis of brain-like mesoporous silica nanocomposites via a selective etching process

Nanoscale ◽  
2015 ◽  
Vol 7 (39) ◽  
pp. 16442-16450 ◽  
Author(s):  
Yu Chen ◽  
Qihua Wang ◽  
Tingmei Wang
Keyword(s):  
Mesoporous Silica ◽  
Large Scale ◽  
Selective Etching ◽  
Etching Process ◽  
Robust Method ◽  
Silica Nanocomposites ◽  
Large Scale Synthesis

A facile and robust method for large-scale synthesis of brain-like structured Au@SiO2 nanocomposites.

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