Large Flake Graphene Oxide Fibers with Unconventional 100% Knot Efficiency and Highly Aligned Small Flake Graphene Oxide Fibers

Abstract

Two types of graphene oxide fibers are spun from high concentration aqueous dopes. Fibers extruded from large flake graphene oxide dope without drawing show unconventional 100% knot efficiency. Fibers spun from small sized graphene oxide dope with stable and continuous drawing yield in good intrinsic alignment with a record high tensile modulus of 47 GPa.

Hybridizing wood cellulose and graphene oxide toward high-performance fibers

“…In terms of the elastic modulus, our infiltrated GO-NFC hybrid microfibers surpass pure NFC microfibers fabricated with longer lengths and higher aspect ratios (22.5 GPa 28 and 23.6 GPa 34 ), LC GO microfibers (~7.7 GPa), 7 stretched Ca 2+ infiltrated GO microfibers (6.3 GPa, after chemical reduction: 11.2 GPa), 13 GO microfibers coagulated from chitosan (22.6 GPa) 10 and biomimetic GO fiber (20.9 GPa), 12 but are inferior to the GO microfibers formed using large GO sheets (47 GPa). 11 However, our infiltrated GO-NFC hybrid microfibers possess a high toughness of 4.9 MJ m − 3 (note that the fiber in reference 11 possesses a UTS of 214 MPa and a strain of 0.6%, which results in a lower toughness). The tensile strength of the infiltrated GO-NFC hybrid microfibers in this work is higher than that of wet-spun NFC microfibers (275 MPa, 28 402 MPa 34 ), LC GO microfibers (~102 MPa), 7 stretched Ca 2+ infiltrated GO microfibers (364 MPa), 13 hydrothermally reduced GO microfibers (180 MPa, after annealing at 800°C: 420 MPa), 35 microfibers prepared from GO nanoribbons (39.3 MPa, after 1050°C treatment: 383 MPa), 8 GO microfibers formed using large GO sheets (214 MPa) 11 and is even compatible to that of chemically cross-linked GO fibers (440 ± 60 MPa).…”

“…11 However, our infiltrated GO-NFC hybrid microfibers possess a high toughness of 4.9 MJ m − 3 (note that the fiber in reference 11 possesses a UTS of 214 MPa and a strain of 0.6%, which results in a lower toughness). The tensile strength of the infiltrated GO-NFC hybrid microfibers in this work is higher than that of wet-spun NFC microfibers (275 MPa, 28 402 MPa 34 ), LC GO microfibers (~102 MPa), 7 stretched Ca 2+ infiltrated GO microfibers (364 MPa), 13 hydrothermally reduced GO microfibers (180 MPa, after annealing at 800°C: 420 MPa), 35 microfibers prepared from GO nanoribbons (39.3 MPa, after 1050°C treatment: 383 MPa), 8 GO microfibers formed using large GO sheets (214 MPa) 11 and is even compatible to that of chemically cross-linked GO fibers (440 ± 60 MPa). 16 A comparable tensile strength to our infiltrated hybrid microfiber is also exhibited by the GO microfibers prepared from very large GO sheets coagulated from chitosan (442 MPa); the average diameter of the GO sheet is 37 μm.…”

“…[13][14][15][16] GO microfibers exhibiting a tensile strength of 442 MPa and an elastic modulus of 47 GPa have been reported. 10,11 The performance, especially the mechanical strength, must be further improved for practical use. 17 In this study, we design and investigate micro-sized fibers by hybridizing 2D GO and 1D NFC.…”

“…6 Transforming 2D GO nanosheets into strong and highly ordered microfibers is a promising feat. [7][8][9][10][11][12] Efforts have been made to improve the mechanical properties of GO-based microfibers by chemical cross-linking and polymer coatings as well as through giant GO nanosheets. [13][14][15][16] GO microfibers exhibiting a tensile strength of 442 MPa and an elastic modulus of 47 GPa have been reported.…”

Advances in liquid crystalline nano-carbon materials: preparation of nano-carbon based lyotropic liquid crystal and their fabrication of nano-carbon fibers with liquid crystalline spinning

“…Although there is an ordered structure tical textures of the liquid crystalline phases of the GO (nematic, lamellar, chiral) and their corresponding structural models were investigated. Furthermore, a lot of methods for fabricating graphene-based composites by liquid crystalline spinning have been reported, including fiber [83][84][85][86][87], aerogel [88], film [89], and network [90] processes.…”