High-concentration aqueous dispersions of graphene produced by exfoliation of graphite using cellulose nanocrystals

Carrasco, Pedro M.; Montes, Sarah; García, Ignacio; Borghei, Maryam; Jiang, Hua; Odriozola, Ibon; Cabañero, Germán; Ruiz, Virginia

doi:10.1016/j.carbon.2013.12.086

Cited by 92 publications

(64 citation statements)

References 33 publications

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“…A C C E P T E D ACCEPTED MANUSCRIPT 3 As well as reinforcing nanomaterial, CNC have been recently reported to effectively stabilize graphene aqueous dispersions prepared by liquid phase exfoliation of graphite [7].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

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Synergistic reinforcement of poly(vinyl alcohol) nanocomposites with cellulose nanocrystal-stabilized graphene

Montes

Carrasco

Ruiz

et al. 2015

Composites Science and Technology

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Section: A N U S C R I P Tmentioning

confidence: 99%

“…CNC length and width were estimated by AFM, with 187±30 and 17±4 nm respectively. GR-CNC nanofillers were prepared by CNC-assisted liquid phase exfoliation (LPE) of graphite, following a recently reported protocol [7]. Briefly, graphite (4 mg mL -1 ) and CNC (16 mg …”

Section: Preparation Of Gr-cncmentioning

confidence: 99%

Synergistic reinforcement of poly(vinyl alcohol) nanocomposites with cellulose nanocrystal-stabilized graphene

Montes

Carrasco

Ruiz

et al. 2015

Composites Science and Technology

Self Cite

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“…Malho et al (2012) reported that NFC could be used in aerogels, composites, and other hybrid materials; they used NFC together with multi-layer graphene (1.25 wt%) to improve the mechanical properties of the nanocomposite, with the resulting material having a Young's modulus 16.9 GPa, ultimate strength of 351 MPa, and work of fracture of 22.3 MJm -3 . Carrasco et al (2014) demonstrated that cellulose nanocrystals can be used as a stabiliser in processing NG dispersions by using ultra-sonication combined with a cooling bath to prevent overheating. After several mechanical treatment and centrifugation steps, they noticed a very stable dispersion of NG-like material displaying minimal sedimentation over several months.…”

Section: Introductionmentioning

confidence: 99%

Nanofibrillated cellulose/nanographite composite films

et al. 2016

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Though research into nanofibrillated cellulose (NFC) has recently increased, few studies have considered co-utilising NFC and nanographite (NG) in composite films, and, it has, however been a challenge to use high-yield pulp fibres (mechanical pulps) to produce this nanofibrillar material. It is worth noting that there is a significant difference between chemical pulp fibres and high-yield pulp fibres, as the former is composed mainly of cellulose and has a yield of approximately 50 % while the latter is consist of cellulose, hemicellulose and lignin, and has a yield of approximately 90 %. NFC was produced by combining TEMPO (2,2,6,6-tetramethypiperidine-1-oxyl)-mediated oxidation with the mechanical shearing of chemi-thermomechanical pulp (CTMP) and sulphite pulp (SP); the NG was produced by mechanically exfoliating graphite. The different NaClO dosages in the TEMPO system differently oxidised the fibres, altering their fibrillation efficiency. NFC-NG films were produced by casting in a Petri dish. We examine the effect of NG on the sheet-resistance and mechanical properties of NFC films. Addition of 10 wt% NG to 90 wt% NFC of sample CC2 (5 mmol NaClO CTMP-NFC homogenised for 60 min) improved the sheet resistance, i.e. from that of an insulating pure NFC film to 180 X/sq. Further addition of 20 (CC3) and 25 wt% (CC4) of NG to 80 and 75 wt% respectively, lowered the sheet resistance to 17 and 9 X/sq, respectively. For the mechanical properties, we found that adding 10 wt% NG to 90 wt% NFC of sample HH2 (5 mmol NaClO SP-NFC homogenised for 60 min) improved the tensile index by 28 %, tensile stiffness index by 20 %, and peak load by 28 %. The film's surface morphology was visualised using scanning electron microscopy, revealing the fibrillated structure of NFC and NG. This methodology yields NFC-NG films that are mechanically stable, bendable, and flexible.

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“…CNWs, [33] extracted from natural fibers, are abundant biomass materials. The 3D porous PU foam is used as the template because it has mechanical and environmental stability.…”

Section: Introductionmentioning

confidence: 99%

Superamphiphilic Polyurethane Foams Synergized from Cellulose Nanowhiskers and Graphene Nanoplatelets

Zhang

Liu

Sui

2017

Adv Materials Inter

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oil are lower than 10°). In 1997, Fujishima and co-workers [14] first reported the photogeneration of a superamphiphilic titanium dioxide surface, producing the microstructure composed of both hydrophilic and oleophilic phases by ultraviolet irradiation. Up to date, two approaches are used to construct superhydrophilic surfaces: one is that some special materials are induced to produce superhydrophilic properties under UV illumination conditions, i.e., photoinduced superhydropholic materials, such as TiO 2 , ZnO, and SnO 2 , [15,16] in which the slightly hydrophilic surface turned to highly hydrophilic surface; the other approach is to increase the surface roughness the hydrophilic material or to create a rough surface by assembling hydrophilic coatings, which is similar to the method of preparing superoleophilic surfaces. [17] Surface roughness, defined as the ratio of the actual surface area to the geometric surface area, has a critical effect on the wettability. It can adjust the wetting characteristics of materials, [18] based on the classical Wenzel [19] and Cassie and Baxter [20] models.Graphene, [21] a one-atom-thick planar sheet in a 3D honeycomb network arranged by carbon atoms, has drawn increasing attention due to high surface area, excellent thermal and chemical stability, and outstanding electrical conductivity since the famous 2004 "scotch tape" experiment by Novoselov et al. [22] 3D graphene-based materials [23][24][25] were extensively studied because of their superhydrophobicity, superior liquid absorption capacity, and excellent stability under harsh chemical and physical conditions. Most 3D graphene assemblies are acquired by reducing graphene oxide (GO), which features hydrophobic and hydrophilic domains, synthesized from graphite powder based on the well-known Hummers' method. [26] Singh et al. [27] demonstrated that superhydrophobic graphene foams (water contact angle (WCA) approach 163°) were synthesized by using template-directed chemical vapor deposition, which contained pores with the size of several hundreds of micrometers, while the walls of the foam was comprised of few-layer graphene sheets coated with Teflon. Ren et al. [28] reported a robust graphene aerogel (water contact angle close to 150.5°) prepared by resorcinol-formaldehyde (RF) sol-gel chemistry for absorbing oils and organic solvents, and the absorption capacity of various oils and organic solvents was up to 19-26 times of its own weight. Oribayo et al. [29] employed polydopamine-reduced graphene oxide and octadecylamine to modify the surface of Superamphiphilic materials are attracting significant attention because of their unique affinity to both water and oil. It is generally accepted that graphene-based assemblies are hydrophobic. Here, novel superamphiphilic polyurethane (PU) foams by the synergetic effect of cellulose nanowhiskers (CNWs) and graphene nanosheets (GNs) are reported. This process involves the creation of CNWs' base coating on the surface of PU network prior to GN coatings to obtain superamphiphilic surf...

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High-concentration aqueous dispersions of graphene produced by exfoliation of graphite using cellulose nanocrystals

Cited by 92 publications

References 33 publications

Synergistic reinforcement of poly(vinyl alcohol) nanocomposites with cellulose nanocrystal-stabilized graphene

Synergistic reinforcement of poly(vinyl alcohol) nanocomposites with cellulose nanocrystal-stabilized graphene

Nanofibrillated cellulose/nanographite composite films

Superamphiphilic Polyurethane Foams Synergized from Cellulose Nanowhiskers and Graphene Nanoplatelets

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