▁thick ness ▁of ▁fib reg lass ▁l amin ate ▁sections , ▁further ▁address ing ▁the ▁problems ▁associated ▁with ▁res in ▁wet ting ▁of ▁thick ▁lay - up ▁sections . ▁Wind ▁tur b ines ▁may ▁also ▁benefit ▁from ▁the ▁general ▁tr end ▁of ▁increasing ▁use ▁and ▁decre asing ▁cost ▁of ▁carbon ▁fib re ▁materials . ▁ ▁Although ▁glass ▁and ▁carbon ▁fib res ▁have ▁many ▁optimal ▁qual ities ▁for ▁tur bine ▁bla de ▁performance , ▁there ▁are ▁several ▁down s ides ▁to ▁these ▁current ▁fill ers , ▁including ▁the ▁fact ▁that ▁high ▁fill er ▁fraction ▁( 1 0 - 7 0 ▁w t %) ▁causes ▁increased ▁density ▁as ▁well ▁as ▁micro scop ic ▁defect s ▁and ▁void s ▁that ▁often ▁lead ▁to ▁prem ature ▁failure . ▁▁ ▁Rec ent ▁develop ments ▁include ▁interest ▁in ▁using ▁carbon ▁nan ot ub es ▁( CN T s ) ▁to ▁rein force ▁polym er - based ▁n ano compos ites . ▁C NT s ▁can ▁be ▁grown ▁or ▁depos ited ▁on ▁the ▁fib res ▁or ▁added ▁into ▁polym er ▁res ins ▁as ▁a ▁matrix ▁for ▁FR P ▁structures . ▁Using ▁nan osc ale ▁C NT s ▁as ▁fill er ▁instead ▁of ▁traditional ▁micro scale ▁fill er ▁( such ▁as ▁glass ▁or ▁carbon ▁fib res ) ▁results ▁in ▁C NT / pol ym er ▁n ano compos ites , ▁for ▁which ▁the ▁properties ▁can ▁be ▁changed ▁significantly ▁at ▁very ▁low ▁fill er ▁contents ▁( typ ically ▁< ▁ 5 ▁w t %). ▁They ▁have ▁very ▁low ▁density ▁and ▁improve ▁the