Size sorting of chemically modified graphene nanoplatelets

Han, Joong Tark; Jang, Jeong In; Kim, Sung Hun; Jeong, Se Young; Jeong, Hee Jin; Lee, Geon-Woong

doi:10.5714/cl.2013.14.2.089

Cited by 10 publications

(7 citation statements)

References 22 publications

(22 reference statements)

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“…The morphology of chitosan/starch-based nanocomposites containing graphene oxide (GO) is shown in Figure 5 and Figure 6 . The TEM and SEM images show well-distinguished GO plate particles in the polysaccharide composite, which means that the graphene oxide has been successfully assembled into polymers [ 39 , 40 ]. The presence of regularly spaced black sheets indicates that GO has been uniformly dispersed throughout the nanocomposite film and that GO does not aggregate in the polysaccharide matrix.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical, Bacteriostatic, and Biological Properties of Starch/Chitosan Polymer Composites Modified by Graphene Oxide, Designed as New Bionanomaterials

et al. 2021

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The application of natural polymer matrices as medical device components or food packaging materials has gained a considerable popularity in recent years, this has occurred in response to the increasing plastic pollution hazard. Currently, constant progress is being made in designing two-component or three-component systems that combine natural materials which help to achieve a quality comparable to the purely synthetic counterparts. This study describes a green synthesis preparation of new bionanocomposites consisting of starch/chitosan/graphene oxide (GO), that possess improved biological activities; namely, good tolerability by human cells with concomitant antimicrobial activity. The structural and morphological properties of bionanocomposites were analyzed using the following techniques: dynamic light scattering, scanning and transmission electron microscopy, wettability and free surface energy determination, and Fourier transform infrared spectroscopy. The study confirmed the homogenous distribution of GO layers within the starch/chitosan matrix and their large particle size. The interactions among the components were stronger in thin films. Additionally, differential scanning calorimetry analysis, UV–vis spectroscopy, surface colour measurements, transparency, water content, solubility, and swelling degree of composites were also performed. The mechanical parameters, such as tensile strength and elongation at break (EAB) were measured in order to characterise the functional properties of obtained nanocomposites. The GO additive altered the thermal features of the composites and decreased their brightness. The EAB of composite was improved by the introduction of GO. Importantly, cell-based analyses revealed no toxic effect of the composites on HaCat keratinocytes and HepG2 hepatoma cells, although a pronounced bacteriostatic effect against various strains of pathogenic bacteria was observed. In conclusion, the starch/chitosan/GO nanocomposites reveal numerous useful physicochemical and biological features, which make them a promising alternative for purely synthetic materials.

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Section: Resultsmentioning

confidence: 99%

Physicochemical, Bacteriostatic, and Biological Properties of Starch/Chitosan Polymer Composites Modified by Graphene Oxide, Designed as New Bionanomaterials

et al. 2021

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“…The result implies that some marginal increase in the interfacial strength between the carbon fiber and the phenolic matrix may be attainable. It is suggested that incorporating chemically functionalized graphite or graphene nanoplatelets [21] into the carbon fiber surfaces may be beneficial for forming additional interfacial bonding between the fibers and the matrix in the composite, and also for improving the mechanical properties of the resulting carbon fiber/phenolic matrix composite.…”

Section: Characterizationmentioning

confidence: 99%

Flexural properties, interlaminar shear strength and morphology of phenolic matrix composites reinforced with xGnP-coated carbon fibers

Park¹,

Lee²,

Drzal³

et al. 2016

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In the present study, exfoliated graphite nanoplatelets (xGnP) with different particle sizes were coated onto polyacrylonitrile-based carbon fibers by a direct coating method. The flexural properties, interlaminar shear strength, and the morphology of the xGnP-coated carbon fiber/phenolic matrix composites were investigated in terms of their longitudinal flexural strength and modulus, interlaminar shear strength, and by optical and scanning electron microscopic observations. The results were compared with a phenolic matrix composite counterpart prepared without xGnP. The flexural properties and interlaminar shear strength of the xGnP-coated carbon fiber/phenolic matrix composites were found to be higher than those of the uncoated composite. The flexural and interlaminar shear strengths were affected by the particle size of the xGnP, while the particle size had no significant effect on the flexural modulus. It seems that the interfacial contacts between the xGnP-coated carbon fibers and the phenolic matrix play a role in enhancing the flexural strength as well as the interlaminar shear strength of the composites.

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“…For example, Hersam et al [22][23][24][25] have reported that isopycnic density gradient ultracentrifugation (iDGU) method can precisely control the thickness (layer number) of 2D materials, while their lateral sizes are still broad. On the other hand, Coleman et al reported the sedimentation rate based DGU (sDGU) [2,26] and liquid cascade centrifugation (LCC) [15,[27][28][29] method for lateral size sorting of 2D materials. For the sDGU and LCC sorted 2D materials, their lateral size and thickness are usually correlated.…”

Section: Introductionmentioning

confidence: 99%

Independent thickness and lateral size sorting of two-dimensional materials

et al. 2021

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Two-dimensional (2D) materials possess unique thickness-and lateral-size-dependent properties. Many efforts have been devoted to obtaining 2D materials with narrow structure heterogeneity while it is still challenging to independently control their thickness and lateral size, limiting their widespread applications. Here, we develop a three-step method which achieves independent thickness and lateral size sorting of 2D materials. Taking 2D h-BN flakes as an example, their thickness and lateral size are independently sorted to different fractions with thicknesses smaller than 6 nm. In addition, the 2D h-BN flakes possess narrow distributions of both thickness and lateral size. We further develop a force field extraction method and achieve scalable size sorting of 2D h-BN, which is universal for sorting other 2D materials including MoS 2 and graphene oxide. This work reports an effective method to produce structure homogenous 2D materials and will help fundamental studies and applications of 2D materials where thickness and lateral size are of concern.

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Size sorting of chemically modified graphene nanoplatelets

Cited by 10 publications

References 22 publications

Physicochemical, Bacteriostatic, and Biological Properties of Starch/Chitosan Polymer Composites Modified by Graphene Oxide, Designed as New Bionanomaterials

Physicochemical, Bacteriostatic, and Biological Properties of Starch/Chitosan Polymer Composites Modified by Graphene Oxide, Designed as New Bionanomaterials

Flexural properties, interlaminar shear strength and morphology of phenolic matrix composites reinforced with xGnP-coated carbon fibers

Independent thickness and lateral size sorting of two-dimensional materials

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