Understanding the colloidal dispersion stability of 1D and 2D materials: Perspectives from molecular simulations and theoretical modeling

Lin, Shangchao; Shih, Chih‐Jen; Sresht, Vishnu; Rajan, Ananth Govind; Strano, Michael S.; Blankschtein, Daniel

doi:10.1016/j.cis.2016.07.007

Cited by 41 publications

(49 citation statements)

References 182 publications

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“…In dilute aqueous phases SANS data indicated transitions in aggregation structure in the presence of graphene for all compounds except SDS. Particularly interesting is how BMIM-DBS induces a cylinder-to-disk transition, all consistent with fully covering surfactant-wrapping of graphene surfaces, deviating from the spherical-to-ellipsoid aggregates seen for the rest compounds (Lin et al, 2016;Matarredona et al, 2003;Mohamed et al, 2018). It does appear that aromatic ring coupled with bulkier counterion type is the best combination, and contributes to the increased graphene compatibility.…”

Section: Discussionmentioning

confidence: 71%

“…The nature of surfactant, concentration, and type of interaction are known to play a crucial role in the dispersion behavior of classical colloids. Learning from CNT-aided surfactant dispersion studies, surfactants showed various self-assembly structures which are responsible for the stabilization of the dispersions (Lin et al, 2016;Vaisman, Wagner, & Marom, 2006;Yurekli, Mitchell, & Krishnamoorti, 2004). Here, in an attempt to understand the different aggregation behavior of surfactants in solution and adsorbed on graphene, and to learn the nature of surfactant graphene interaction for stabilization, small-angle neutron scattering (SANS) has been employed.…”

Section: Small-angle Neutron Scatteringmentioning

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: Discussionmentioning

confidence: 71%

Section: Small-angle Neutron Scatteringmentioning

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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“…Due to the important role of the dispersants for liquid-phase exfoliation, numerous theoretical studies have focused on the aggregation behavior and the energetic barrier between graphene flakes in the presence of dispersants. [25][26][27][28][29][30][31] Typically, classical molecular dynamics (MD) simulations were performed to gain detailed information on the influence of the dispersants. For example, the aggregational tendencies of graphene nanoribbons with hydrogen terminated edges were compared with polyethylene glycol and n-alkoxy chains substituted along the edge of graphene.…”

Section: Introductionmentioning

confidence: 99%

“…28 In particular with respect to the interaction between covered graphene flakes, it was observed that an enhanced repulsive potential of mean force (PMF) can be obtained by increasing the SDS surface coverage or by introducing the electrolyte CaCl 2 . 26 More generally, the interfacial interaction for graphene exfoliation in different organic solvent media 27 and the electrostatic interactions of graphene stabilized in SC dispersant aqueous solution 29,31 were studied.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of aqueous graphene dispersions utilizing a biocompatible dispersant: a molecular dynamics study

Huang

Bezugly

Cuniberti

2019

Phys. Chem. Chem. Phys.

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Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Yuan

et al. 2022

Advanced Materials

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The separation of gaseous mixtures is essential in the chemical industry, including hydrogen separation in ammonia or petrochemical plants, nitrogen separation from air, CO 2 separation in natural gas processing, [7] olefin/ paraffin separation, [1] and H 2 S separation from sour gas. [8] Similar to separation processes in general, thermal-based gasseparation methods, such as cryogenic distillation, amine adsorption, and vapor condensation, consume a high amount of energy, which can be significantly reduced using gas-separation membrane units. [5,8] A membrane that can separate gases allows certain components in a mixture to permeate at higher rates than others. The economic competitiveness of a gas-separation membrane highly depends on its gas permeance K and its selectivity S. The permeance K i of gas species i (in SI units of mol m −2 s −1 Pa −1 ) is defined as K i = F i /Δp i , where F i (in SI units of mol m −2 s −1 ) is the flux of gas i through the membrane, and Δp i is the partial pressure difference (the driving force) of gas i between the feed side and the permeate side. For relatively thick conventional membranes, whose crossmembrane transport resistance is dominated by the bulk interior, the permeance K i is inversely proportional to the membrane thickness d. Correspondingly, the permeability P i of gas i (in SI units of mol m −1 s −1 Pa −1 ) is defined aswhich is an intrinsic property of a material. The selectivity S ij between gases i and j is defined as S ij = K i /K j = P i /P j .Polymers have been the most widely used materials for gasseparation membranes for decades because of their relatively low cost and low manufacturing difficulty. [8,9] However, membrane separations using state-of-the-art polymeric membranes cannot outcompete the thermal-based separation methods economically. [7] One of the limitations of the polymeric membranes is the trade-off between permeability and selectivity, originally investigated by Robeson. [10,11] The best combination of permeability and selectivity for a binary gas pair is referred to as the polymer upper bound. This trade-off originates from the interplay between the free volume spacing in the polymer matrices and the size of the gas molecules. [12] Smaller polymeric spacing increases the selectivity but sacrifices the permeability due to the lower gas Porous graphene and other atomically thin 2D materials are regarded as highly promising membrane materials for high-performance gas separations due to their atomic thickness, large-scale synthesizability, excellent mechanical strength, and chemical stability. When these atomically thin materials contain a high areal density of gas-sieving nanoscale pores, they can exhibit both high gas permeances and high selectivities, which is beneficial for reducing the cost of gas-separation processes. Here, recent modeling and experimental advances in nanoporous atomically thin membranes for gas separations is discussed. The major challenges involved, including controlling pore size distributions, scaling up the membrane ar...

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Understanding the colloidal dispersion stability of 1D and 2D materials: Perspectives from molecular simulations and theoretical modeling

Cited by 41 publications

References 182 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

Stabilization of aqueous graphene dispersions utilizing a biocompatible dispersant: a molecular dynamics study

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

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