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“Multi-level tower” ZnO with bulk quantity has been grown by a simple aqueous solution technique. Detailed structural characterization revealed that, the “multi-level tower” ZnO showed perfect hexagonal sectional morphology, with the length and diameter being 1–2μm and 200–300nm, respectively. When “multi-level tower” ZnO was used as the solid base catalyst to synthesize biodiesel, a biodiesel yield...
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