Organic Solvent-Based Graphene Oxide Liquid Crystals: A Facile Route toward the Next Generation of Self-Assembled Layer-by-Layer Multifunctional 3D Architectures

Jalili, Rouhollah; Aboutalebi, Seyed Hamed; Esrafilzadeh, Dorna; Konstantinov, Konstantin; Moulton, Simon E.; Razal, Joselito M.; Wallace, Gordon G.

doi:10.1021/nn305906z

Cited by 228 publications

(264 citation statements)

References 69 publications

(167 reference statements)

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“…25 Both concentrated NFC and GO suspensions can self-assemble into ordered LC arrangements; this methodology has been demonstrated to create strong and well-aligned fibers. 13,26,27 Here, we prepared a LC spinning solution consisting of GO and NFC (weight ratio of 1:1) at a concentration of 1.1 wt% (Figure 2c). When GO and NFC were uniformly mixed together, the solution yielded a uniform parallelbanded texture that was distinct from pure GO as the width of the aligned bands was thinner than the GO LC ( Figure 2c and Supplementary Figure S1a).…”

Section: Resultsmentioning

confidence: 99%

Hybridizing wood cellulose and graphene oxide toward high-performance fibers

Zhu

et al. 2015

NPG Asia Mater

101

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High-performance microfibers such as carbon fibers are widely used in aircraft and wind turbine blades. Well-aligned, strong microfibers prepared by hybridizing two-dimensional (2D) graphene oxide (GO) nanosheets and one-dimensional (1D) nanofibrillated cellulose (NFC) fibers are designed here for the first time and have the potential to supersede carbon fibers due to their low cost. These well-aligned hybrid microfibers are much stronger than microfibers composed of 1D NFC or 2D GO alone. Both the experimental results and molecular dynamics simulations reveal the synergistic effect between GO and NFC: the bonding between neighboring GO nanosheets is enhanced by NFC because the introduction of NFC provides the extra bonding options available between the nanosheets. In addition, 1D NFC fibers can act as 'lines' to 'weave and wrap' 2D nanosheets together. A 2D GO nanosheet can also bridge several 1D NFC fibers together, providing extra bonding sites between 1D NFC fibers over a long distance. The design rule investigated in this study can be universally applied to other structure designs where a synergistic effect is preferred. NPG Asia Materials (2015) 7, e150; doi:10.1038/am.2014.111; published online 9 January 2015 INTRODUCTIONStrong synthetic fibers such as carbon fibers have an important role in a range of applications from aircraft to wind turbine blades. However, these fibers are expensive and demonstrate limited performance. Nanofibrillated cellulose (NFC), derived mainly from wood, is an inexhaustible one-dimensional (1D) material with a diameter in nanoscale and a length in microscale. 1 This material has been explored as a possible building block for high-strength composites due to its impressive mechanical properties with an elastic modulus of~140 GPa. 2 Moreover, NFC possesses a high specific area and strong interacting surface hydroxyls, and can therefore act as an excellent reinforcement/binder. 3,4 In addition, chemically exfoliated twodimensional (2D) graphene oxide (GO) nanosheets exhibit excellent mechanical properties, a high aspect ratio and good processibility, making the nanosheets another attractive building block to produce strong microfibers. 5 Numerous hydroxyl, epoxide functional groups and carboxyl groups are present on the GO nanosheet basal planes and edges, providing strong bonding sites and allowing the GO nanosheets to be well-dispersed in water. 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

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Section: Resultsmentioning

confidence: 99%

Hybridizing wood cellulose and graphene oxide toward high-performance fibers

Zhu

et al. 2015

NPG Asia Mater

101

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“…13,[26][27][28][29] Then, obtained aqueous GO dispersion was dispersed in highly polar organic solvents, dimethylformamide (DMF) by using solvent exchange procedure. 30 Further, the PVDF-HFP pellets were individually dissolved into DMF solvent. GO can uniformly dispersed into PVDF-HFP matrix because of the strong specific interaction between carbonyl groups of GO and fluorine group of PVDF-HFP matrix.…”

Section: Experimental Detailmentioning

confidence: 99%

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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Here, we study the self-aligned asymmetric electrically conductive composite thin film prepared via casting of graphene oxide (GO)/poly (vinylidene-hexafluoropropylene) (PVDF-HFP) dispersion, followed by low temperature hydriodic acid reduction. The results showed that composite thin film revealed the high orientation of graphene sheets along the direction of film surface. However, graphene sheets are asymmetrically distributed along the film thickness direction in the composite film. Both sides of as prepared composite film showed different surface characteristics. The asymmetric surface properties of composite film induced distinction of surface resistivity response; top surface resistivity (21 Ohm) is ∼ 4 times higher than bottom surface resistivity (5 Ohm). This asymmetric highly electrically conducting composite film revealed efficient electromagnetic interference (EMI) shielding effectiveness of ∼ 30 dB. This study could be crucial for achieving aligned asymmetric composite thin film for high-performance EMI shielding radiation.

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“…9,50 The extent of oxidation and choice of exfoliation procedures used are critical for controlling the efficiency of exfoliation, lateral sheet size as well as the number of GO layers (Table 2). 47,48,[51][52][53][54][55] As the oxygen content increases in the starting graphite oxide, the efficiency of exfoliation also increases. 47 For example, in their study of the capillary zone electrophoresis of GO, Mueller et al 53 exfoliated graphite oxide using high dilution at different intervals of ultrasonication over 15 h. As observed in the atomic force microscopy images of the resulting GO, the lateral size reduced over that time from the initial 10 μm to 100 nm.…”

Section: Exfoliation Of Graphite Oxidementioning

confidence: 99%

Chemically converted graphene: scalable chemistries to enable processing and fabrication

et al. 2015

Self Cite

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Graphene, a nanocarbon with exceptional physical and electronic properties, has the potential to be utilized in a myriad of applications and devices. However, this will only be achieved if scalable, processable forms of graphene are developed along with ways to fabricate these forms into material structures and devices. In this review, we provide a comprehensive overview of the chemistries suitable for the development of aqueous and organic solvent graphene dispersions and their use for the preparation of a variety of polymer composites, materials useful for the fabrication of graphene-containing structures and devices. Fabrication of the processable graphene dispersions or composites by printing (inkjet and extrusion) or spinning methods (wet) is reviewed. The preparation and fabrication of liquid crystalline graphene oxide dispersions whose unique rheologies allow the creation of graphene-containing structures by a wide range of industrially scalable fabrication techniques such as spinning (wet and dry), printing (ink-jet and extrusion) and coating (spray and electrospray) is also reviewed.

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Organic Solvent-Based Graphene Oxide Liquid Crystals: A Facile Route toward the Next Generation of Self-Assembled Layer-by-Layer Multifunctional 3D Architectures

Cited by 228 publications

References 69 publications

Hybridizing wood cellulose and graphene oxide toward high-performance fibers

Hybridizing wood cellulose and graphene oxide toward high-performance fibers

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Chemically converted graphene: scalable chemistries to enable processing and fabrication

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