** Shares of Australia's Nanoveu Ltd NVU.AX rise as much as 16.7% to A$0.035, posting their biggest intraday pct gain since Dec. 12
** Nanotechnology co says South Korea's Rahum Nano Tech places substantial purchase order for co's EyeFly3D smartphone covers
** Says order valued at $850,000
** Stock had risen 30.4% this year, as of last close
(Reporting by Roshan Thomas in Bengaluru)
((Roshan.Thomas@thomsonreuters.com))