(Sand weight: 25 g; Water volume: 50 ml; Media weight: 113 g; Mill speed: 400rpm; milling period 6 hr)
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| Figure 1a: SEM images of effect of milling period (hr) on SiO2 NPs size (Sand weight: 25 g; Water volume: 50 ml; Media weight: 113 g; Mill speed: 400rpm; milling period 6 hr) |
