scholarly journals Dynamic assembly of liquid crystalline graphene oxide gel fibers for ion transport

2018 ◽  
Vol 4 (11) ◽  
pp. eaau2104 ◽  
Author(s):  
H. Park ◽  
K. H. Lee ◽  
Y. B. Kim ◽  
S. B. Ambade ◽  
S. H. Noh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystalline ◽  
Colloidal Dispersions ◽  
Charge Carriers ◽  
Wet Spinning ◽  
Great Promise ◽  
Orientation Factor ◽  
Liquid Crystallinity ◽  
Spinning Process ◽  
Dynamic Assembly

Colloidal dispersions with liquid crystallinity hold great promise for fabricating their superstructures. As an example, when graphene oxide (GO) sheets are assembled in the liquid crystalline state, they can turn into ordered macroscopic forms of GO such as fibers via the wet spinning process. Here, we report that by reinforcing intersheet interactions, GO liquid crystals (LCs) turn into mechanically robust hydrogels that can be readily drawn into highly aligned fibrillar structures. GO hydrogel fibers with highly aligned sheets (orientation factor, f = 0.71) exhibit more than twice the ionic conductivity compared to those with partially aligned structures (f = 0.01). The hierarchically interconnected two-dimensional nanochannels within these neatly aligned GOLC hydrogel fibers may facilitate controlled transport of charge carriers and could be potentially explored as cables for interconnecting biosystems and/or human-made devices.

scholarly journals Graphene Oxide: Scalable One-Step Wet-Spinning of Graphene Fibers and Yarns from Liquid Crystalline Dispersions of Graphene Oxide: Towards Multifunctional Textiles (Adv. Funct. Mater. 43/2013)

2013 ◽  
Vol 23 (43) ◽  
pp. 5344-5344 ◽  
Author(s):  
Rouhollah Jalili ◽  
Seyed Hamed Aboutalebi ◽  
Dorna Esrafilzadeh ◽  
Roderick L. Shepherd ◽  
Jun Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystalline ◽  
Wet Spinning ◽  
One Step ◽  
Graphene Fibers

scholarly journals Scalable One-Step Wet-Spinning of Graphene Fibers and Yarns from Liquid Crystalline Dispersions of Graphene Oxide: Towards Multifunctional Textiles

2013 ◽  
Vol 23 (43) ◽  
pp. 5345-5354 ◽  
Author(s):  
Rouhollah Jalili ◽  
Seyed Hamed Aboutalebi ◽  
Dorna Esrafilzadeh ◽  
Roderick L. Shepherd ◽  
Jun Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystalline ◽  
Wet Spinning ◽  
One Step ◽  
Graphene Fibers

scholarly journals The effect of liquid crystalline graphene oxide compared with non-liquid crystalline graphene oxide on the rheological properties of polyacrylonitrile solution

2021 ◽  
Vol 40 (1) ◽  
pp. 428-438
Author(s):  
Baihua Liu ◽  
Cong Wang ◽  
Yu Muhuo
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystal ◽  
Rheological Properties ◽  
Liquid Crystalline ◽  
Viscosity Index ◽  
Low Frequency ◽  
Liquid Crystallinity ◽  
Liquid Crystal System ◽  
Liquid Crystal Property ◽  
Polyacrylonitrile Solution

Abstract In this article, polyacrylonitrile (PAN) and two kinds of graphene oxide (GO) with different structural properties are blended in dimethyl sulfoxide (DMSO) according to a certain ratio to prepare stable-spinning solution. One kind of GO is purchased, and we call it GO1. The other is a kind of self-made GO with liquid crystal property in solution, which is called GO2. The effects of two kinds of GO on the rheological properties of PAN/GO spinning solution (15 wt%) were studied. The results show that the viscous activation energy of the liquid crystal GO2/PAN blend solution is significantly higher than that of the nonliquid crystal GO1/PAN blend solution. Moreover, the liquid crystal system is more obviously affected by temperature. The structural viscosity index of the liquid crystalline GO2/PAN solution is obviously lower than that of the GO1/PAN solution. It indicates that the existence of liquid crystallinity is beneficial to the spinning of the solution. In the low-frequency region, the addition of GO1 makes the solution more elastic, and the addition of GO2 makes the solution more viscous.

Theoretical and experimental investigation of the wet-spinning process for mechanically strong carbon nanotube fibers

2021 ◽  
Vol 412 ◽  
pp. 128650
Author(s):  
Hyeon Dam Jeong ◽  
Seo Gyun Kim ◽  
Gyeong Min Choi ◽  
Minji Park ◽  
Bon-Cheol Ku ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Carbon Nanotube ◽  
Wet Spinning ◽  
Spinning Process ◽  
Carbon Nanotube Fibers

scholarly journals Hierarchical spidroin micellar nanoparticles as the fundamental precursors of spider silks

2018 ◽  
Vol 115 (45) ◽  
pp. 11507-11512 ◽  
Author(s):  
Lucas R. Parent ◽  
David Onofrei ◽  
Dian Xu ◽  
Dillan Stengel ◽  
John D. Roehling ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Spider Silk ◽  
Fiber Spinning ◽  
Fiber Formation ◽  
Natural Material ◽  
Physical Form ◽  
Spinning Process ◽  
Black Widow Spiders ◽  
Spider Silks

Many natural silks produced by spiders and insects are unique materials in their exceptional toughness and tensile strength, while being lightweight and biodegradable–properties that are currently unparalleled in synthetic materials. Myriad approaches have been attempted to prepare artificial silks from recombinant spider silk spidroins but have each failed to achieve the advantageous properties of the natural material. This is because of an incomplete understanding of the in vivo spidroin-to-fiber spinning process and, particularly, because of a lack of knowledge of the true morphological nature of spidroin nanostructures in the precursor dope solution and the mechanisms by which these nanostructures transform into micrometer-scale silk fibers. Herein we determine the physical form of the natural spidroin precursor nanostructures stored within spider glands that seed the formation of their silks and reveal the fundamental structural transformations that occur during the initial stages of extrusion en route to fiber formation. Using a combination of solution phase diffusion NMR and cryogenic transmission electron microscopy (cryo-TEM), we reveal direct evidence that the concentrated spidroin proteins are stored in the silk glands of black widow spiders as complex, hierarchical nanoassemblies (∼300 nm diameter) that are composed of micellar subdomains, substructures that themselves are engaged in the initial nanoscale transformations that occur in response to shear. We find that the established micelle theory of silk fiber precursor storage is incomplete and that the first steps toward liquid crystalline organization during silk spinning involve the fibrillization of nanoscale hierarchical micelle subdomains.

Reduction of graphene oxide alters its cyto-compatibility towards primary and immortalized macrophages

Nanoscale ◽  
2018 ◽  
Vol 10 (30) ◽  
pp. 14637-14650 ◽  
Author(s):  
Yakun Wu ◽  
Fanfan Wang ◽  
Shunhao Wang ◽  
Juan Ma ◽  
Ming Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Great Promise ◽  
Reduced Graphene

Graphene oxide (GO) and its derivatives (e.g., reduced graphene oxide, RGO) have shown great promise in biomedicine.

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