Rational design of aromatic surfactants for graphene/natural rubber latex nanocomposites with enhanced electrical conductivity

Mohamed, Azmi; Ardyani, Tretya; Bakar, Suriani Abu; Sagisaka, Masanobu; Umetsu, Yasushi; Hamon, Joshua J.; Rahim, Bazura Abdul; Esa, Siti Rahmah; Khalil, H. P. S. Abdul; Mamat, M. H.; King, Stephen M.; Eastoe, Julian

doi:10.1016/j.jcis.2018.01.041

Cited by 42 publications

(32 citation statements)

References 67 publications

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“…This kind of observation has been previously reported with similar surfactants, suggesting the presence of weak interaction between surfactant and graphene surfaces (Mohamed et al, 2018;Yurekli et al, 2004 Moving to BMIM-DBS, the data reveals Q -2 regimes of scattering consistent with a disklike model (Feigin & Svergun, 1987;Hollamby, 2013), giving a fitted disk radius of 143 Å. In an earlier study of graphene nanoplatelet dispersions with anionic aromatic surfactants, a disk type transition was also found for surfactants with highest dispersion efficiency (highest electrical conductivity enhancement) (Mohamed et al, 2018). Recalling the electrical properties and microscopic observation, BMIM-DBS offers an increased dispersion quality compared to the rest of the stabilizers.…”

Section: Small-angle Neutron Scatteringsupporting

confidence: 87%

“…Earlier studies on SDBS using quasielastic light scattering give evidence of the formation sphero-cylinder micelles with Rsphere of 22 Å (Cheng & Gulari, 1982). Recent SANS study also reported the formation of 22 Å spherical micelles of SDBS surfactant at 25°C (Mohamed et al, 2018).…”

Section: Small-angle Neutron Scatteringmentioning

confidence: 89%

“…That result is consistent with SANS data obtained here. In that work it was assumed that the surfactant adsorbed and wrapped the graphene surfaces giving an appearance as disk-type aggregated structure (Mohamed et al, 2018). Taking all the results together, it is clear that RGO dispersions are present, further ideas for the mechanism on how the surfactant adsorbs on graphene surfaces, and the possible interaction between surfactant and cellulose will be discussed in the following section.…”

Section: Small-angle Neutron Scatteringmentioning

confidence: 99%

“…From a general viewpoint, gradually increasing the concentration of surfactant led to modest increases in the electrical conductivities. Again reiterating the importance of surfactant concentration in exfoliation and keeping the exfoliated layer stably dispersed (Lotya et al, 2009;Mohamed et al, 2018;Suriani, Nurhafizah, Mohamed, Zainol, & Masrom, 2015;Wang, Yi, & Shen, 2016). It was hypothesized that the chosen surfactant concentrations (0.05 -0.1 M) are sufficient to form a network that provides electrical pathways, considering the significant σ from neat cellulose, and that the presence of RGO enveloping the cellulose network did assist the development of the electrical conductivity of the paper.…”

Section: Zeta Potential Measurementsmentioning

confidence: 99%

“…It is believed that the distinct aggregation behaviour of BMIM-DBS is a consequence of the increased RGO surfaces being occupied by BMIM-DBS, wrapping up RGO sheets for stabilization. A previous study revealed that an anionic tri-chain aromatic surfactant namely TC3Ph3 (AZMI ADD THIS chemical name) showed a similar disk-type aggregation due to a fullcoverage of surfactant-wrapping the graphene surfaces (Lin et al, 2016;Mohamed et al, 2018).…”

Section: 7mentioning

confidence: 99%

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Preparation of conductive cellulose paper through electrochemical exfoliation of graphite: The role of anionic surfactant ionic liquids as exfoliating and stabilizing agents

Mohamed

Ardyani

Bakar

et al. 2018

Carbohydrate Polymers

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A facile electrochemical exfoliation method was established to efficiently prepare conductive paper containing reduced graphene oxide (RGO) with the help of single chain anionic surfactant ionic liquids (SAILs). The surfactant ionic liquids are synthesized from conventional organic surfactant anions and a 1-butyl-3-methyl-imidazolium cation. For the first time the combination of SAILs and cellulose was used to directly exfoliate graphite. The ionic liquid 1-butyl-3-methyl-imidazolium dodecylbenzenesulfonate (BMIM-DBS) was shown to have notable affinity for graphene, demonstrating improved electrical properties of the conductive cellulose paper. The presence of BMIM-DBS in the system promotes five orders of magnitude enhancement of the paper electrical conductivity (2.71 × 10 S cm) compared to the native cellulose (1.97 × 10 S cm). A thorough investigation using electron microscopy and Raman spectroscopy highlights the presence of uniform graphene incorporated inside the matrices. Studies into aqueous aggregation behavior using small-angle neutron scattering (SANS) point to the ability of this compound to act as a bridge between graphene and cellulose, and is responsible for the enhanced exfoliation level and stabilization of the resulting dispersion. The simple and feasible process for producing conductive paper described here is attractive for the possibility of scaling-up this technique for mass production of conductive composites containing graphene or other layered materials.

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Section: Small-angle Neutron Scatteringsupporting

confidence: 87%

Section: Small-angle Neutron Scatteringmentioning

confidence: 89%

Section: Small-angle Neutron Scatteringmentioning

confidence: 99%

Section: Zeta Potential Measurementsmentioning

confidence: 99%

Section: 7mentioning

confidence: 99%

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Preparation of conductive cellulose paper through electrochemical exfoliation of graphite: The role of anionic surfactant ionic liquids as exfoliating and stabilizing agents

Mohamed

Ardyani

Bakar

et al. 2018

Carbohydrate Polymers

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Synthesis of Superelastic, Highly Conductive Graphene Aerogel/Liquid Metal Foam and its Piezoresistive Application

Ma,

Yan,

et al. 2024

Chemistry A European J

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Graphene aerogel (GA) has important application potential as piezoresistive sensors due to its low density, high conductivity, high porosity, and good mechanical properties. However, the fabrication of GA‐based sensors with good mechanical properties and excellent sensing performance is still challenging. Herein, liquid‐ metal‐modified GAs (GA/LM) are proposed for the development of an excellent GA‐based sensor. GA/LM with three‐dimensional interconnected layered structure exhibits excellent compressive stress of 41 KPa and fast response time (<20 ms). While generally flexible GA composites cannot be compressed beyond 80% strain without plastic deformation,GA/LM demonstrates a high compressive strength of 60 kPa under a strain of 90%. A real‐time pressure sensor was fabricated based on GA/LM‐2 to monitor swallowing, pulse beating, finger, wrist and knee bending, and even plantar pressure during walking. These excellent features enable potential applications in health detection.

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Evaluating the effect of graphene oxide PEGylation on the properties of chitosan‐graphene oxide nanocomposite scaffold

2022

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In this study, graphene oxide (GO) was functionalized with polyethylene glycol (PEG) to understand the effect of PEGlayted GO on properties of chitosan‐based nanocomposite scaffold. GO was synthesized according to modified Hummer's method and covalently linked to polymeric chains of PEG to produce polyethylene glycolated GO (PGO). Successful preparation of GO and PGO was confirmed by FT‐IR and Raman techniques, where the chemical bonding of PEG and GO nanosheets were concluded based on PGOs' lower zeta potential compared to GO. Nanocomposite scaffolds were prepared by adding equal amounts of GO and PGO into 2% (w/v) chitosan (Cs) solutions. The highly porous scaffolds were developed by lyophilization of solutions. Incorporation of GO and PGO into chitosan scaffold network resulted in uniform and spherical pores. Modified samples offered higher porosity and density, indicating adequate scaffold structure. Improvements in the physical properties of prepared chitosan scaffolds were concluded through higher water absorption and retention values. Compressive strength measurement showed 6.33 and 5.5 times improvement respectively for Cs‐GO and Cs‐PGO samples compared to Cs scaffold. The Cs‐GO scaffolds showed minimum susceptibility toward enzymatic degradation and higher degrees of protein adsorption (26% and 23% improvement in value of adsorbed protein respectively for Cs‐GO and Cs‐PGO compared to Cs scaffold) and biomineral formation on scaffold surface. Also, Cs‐PGO sample showed the highest degree of cell viability and lower hemolysis than both Cs and Cs‐GO scaffolds. Investigations showed that cell infiltration into scaffold porous structure was more prominent in Cs‐PGO scaffolds than in Cs and Cs‐GO scaffolds.

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Rational design of aromatic surfactants for graphene/natural rubber latex nanocomposites with enhanced electrical conductivity

Cited by 42 publications

References 67 publications

Preparation of conductive cellulose paper through electrochemical exfoliation of graphite: The role of anionic surfactant ionic liquids as exfoliating and stabilizing agents

Preparation of conductive cellulose paper through electrochemical exfoliation of graphite: The role of anionic surfactant ionic liquids as exfoliating and stabilizing agents

Synthesis of Superelastic, Highly Conductive Graphene Aerogel/Liquid Metal Foam and its Piezoresistive Application

Evaluating the effect of graphene oxide PEGylation on the properties of chitosan‐graphene oxide nanocomposite scaffold

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