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In this letter, the uniform 4H silicon carbide (SiC) mesopores was fabricated by pulsed electrochemical etching method. The length of the mesopores is about 19 μm with a diameter of about 19 nm. The introduction of pause time (Toff) is crucial to form the uniform 4H-SiC mesopores. The pore diameter will not change if etching goes with Toff. The hole concentration decreasing at the pore tips during...
A novel unsymmetrical and kink noncoplanar heterocyclic bisphenol-like monomer, 4-(4-hydroxynaphthalenyl)phthalazin-1-one (2), was synthesized in a two-step reaction starting from 1-naphthol and phthalic anhydride via Friedel-Crafts acylation reaction and cyclization with hydrazine hydrate. Two heterocyclic poly(arylene ether)s were prepared conveniently from monomer 2 and two activated dihalide monomers...
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