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Shaharudin MR, Williams CD, Achari A, Nair RR, Carbone P. Decoding the Interplay between Topology and Surface Charge in Graphene Oxide Membranes During Humidity Induced Swelling. ACS NANO 2023; 17:21923-21934. [PMID: 37917940 PMCID: PMC10655246 DOI: 10.1021/acsnano.3c08260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 11/04/2023]
Abstract
Graphene oxide (GO) membranes are known to have a complex morphology that depends on the degree of oxidation of the graphene flake and the membrane preparation technique. In this study, using Grand Canonical Monte Carlo simulations, we investigate the mechanism of swelling of GO membranes exposed to different relative humidity (RH) values and show how this is intimately related to the graphene surface chemistry. We show that the structure of the GO membrane changes while the membrane adsorbs water from the environment and that graphene oxide flakes become charged as the membrane is loaded with water and swells. A detailed comparison between simulation and experimental adsorption data reveals that the flake surface charge drives the water adsorption mechanism at low RH when the membrane topology is still disordered and the internal pores are small and asymmetric. As the membrane is exposed to higher RH (80%), the flake acquires more surface charge as more oxide groups deprotonate, and the pores grow in size, yet maintain their disordered geometry. Only for very high relative humidity (98%) does the membrane undergo structural changes. At this level of humidity, the pores in the membrane become slit-like but the flake surface charge remains constant. Our results unveil a very complex mechanism of swelling and show that a single molecular model cannot fully capture the ever-changing chemistry and morphology of the membrane as it swells. Our computational procedure provides the first atomically resolved insight into the GO membrane structure of experimental samples.
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Affiliation(s)
- Mohd Rafie
bin Shaharudin
- Department
of Chemical Engineering, School of Engineering, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
| | - Christopher D. Williams
- Division
of Pharmacy and Optometry, School of Health Sciences, The University of Manchester, Oxford Road, M13 9PT Manchester, United Kingdom
| | - Amritroop Achari
- Department
of Chemical Engineering, School of Engineering, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
- National
Graphene Institute, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
| | - Rahul R. Nair
- Department
of Chemical Engineering, School of Engineering, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
- National
Graphene Institute, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
| | - Paola Carbone
- Department
of Chemical Engineering, School of Engineering, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom
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2
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Barria-Urenda M, Ruiz-Fernandez A, Gonzalez C, Oostenbrink C, Garate JA. Size Matters: Free-Energy Calculations of Amino Acid Adsorption over Pristine Graphene. J Chem Inf Model 2023; 63:6642-6654. [PMID: 37909535 DOI: 10.1021/acs.jcim.3c00418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2023]
Abstract
There is still growing interest in graphene interactions with proteins, both for its possible biological applications and due to concerns over detrimental effects at the cellular level. As with any process involving proteins, an understanding of amino acid composition is desirable. In this work, we systematically studied the adsorption process of amino acids onto pristine graphene via rigorous free-energy calculations. We characterized the free energy, potential energy, and entropy of the adsorption of all proteinogenic amino acids. The energetic components were further separated into pair interaction contributions. A linear correlation was found between the free energy and the solvent accessible surface area change during adsorption (ΔSASAads) over pristine graphene and uncharged amino acids. Free energies over pristine graphene were compared with adsorption onto graphene oxide, finding an almost complete loss of the favorability of amino acid adsorption onto graphene. Finally, the correlation with ΔSASAads was used to successfully predict the free energy of adsorption of several penta-l-peptides in different structural states and sequences. Due to the relative ease of calculating the ΔSASAads compared to free-energy calculations, it could prove to be a cost-effective predictor of the free energy of adsorption for proteins onto nonpolar surfaces.
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Affiliation(s)
- Mateo Barria-Urenda
- Centro Interdisciplinario de Neurociencia de Valparaíso, Pasaje Harrington 287, Playa Ancha, 2381850 Valparaíso, Chile
- Doctorado en Ciencias, Mención Biofísica y Biología Computacional, Facultad de Ciencias, Universidad de Valparaíso, 2360102 Valparaíso, Chile
- Millennium Nucleus in NanoBioPhysics (NNBP), Universidad San Sebastian, Bellavista, 7510602 Santiago, Chile
| | - Alvaro Ruiz-Fernandez
- Centro Científico y Tecnológico de Excelencia, Fundacion Ciencia & Vida, Santiago, Santiago 7780272, Chile
| | - Carlos Gonzalez
- Millennium Nucleus in NanoBioPhysics (NNBP), Universidad San Sebastian, Bellavista, 7510602 Santiago, Chile
| | - Chris Oostenbrink
- Institute for Molecular Modeling and Simulation, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
| | - Jose Antonio Garate
- Centro Interdisciplinario de Neurociencia de Valparaíso, Pasaje Harrington 287, Playa Ancha, 2381850 Valparaíso, Chile
- Millennium Nucleus in NanoBioPhysics (NNBP), Universidad San Sebastian, Bellavista, 7510602 Santiago, Chile
- Centro Científico y Tecnológico de Excelencia, Fundacion Ciencia & Vida, Santiago, Santiago 7780272, Chile
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Bellavista, 7510602 Santiago, Chile
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3
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Acharya GR, Tyagi M, Mamontov E, Hoffmann PM. Diffusion Dynamics of Water and Ethanol in Graphene Oxide. J Phys Chem B 2023; 127:7384-7393. [PMID: 37556231 DOI: 10.1021/acs.jpcb.2c08960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
We utilized the momentum transfer (Q)-dependence of quasi-elastic neutron scattering (QENS) to measure the dynamics of water and ethanol confined in graphene oxide (GO) powder or membranes at different temperatures and in different orientations. We found reduced diffusivities (up to 30% in the case of water) and a depression of dynamic transition temperatures. While water showed near Arrhenius behavior with an almost bulk-like activation barrier in a temperature range of 280-310 K, the diffusivity of ethanol showed little temperature dependence. For both water and ethanol, we found evidence for immobile and mobile fractions of the confined liquid. The mobile fraction exhibited jump diffusion, with a jump length consistent with the expected average spacing of hydroxide groups in the GO surfaces. From anisotropy measurements, we found weak anisotropy in the diffusivity of the mobile species and in the fraction and geometry of immobile species.
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Affiliation(s)
- Gobin Raj Acharya
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6473, Oak Ridge, Tennessee 37831, United States
| | - Peter M Hoffmann
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
- Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, Florida 32114, United States
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4
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Rissanou A, Konstantinou A, Karatasos K. Morphology and Dynamics in Hydrated Graphene Oxide/Branched Poly(ethyleneimine) Nanocomposites: An In Silico Investigation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1865. [PMID: 37368295 DOI: 10.3390/nano13121865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/09/2023] [Accepted: 06/12/2023] [Indexed: 06/28/2023]
Abstract
Graphene oxide (GO)-branched poly(ethyleneimine) (BPEI) hydrated mixtures were studied by means of fully atomistic molecular dynamics simulations to assess the effects of the size of polymers and the composition on the morphology of the complexes, the energetics of the systems and the dynamics of water and ions within composites. The presence of cationic polymers of both generations hindered the formation of stacked GO conformations, leading to a disordered porous structure. The smaller polymer was found to be more efficient at separating the GO flakes due to its more efficient packing. The variation in the relative content of the polymeric and the GO moieties provided indications for the existence of an optimal composition in which interaction between the two components was more favorable, implying more stable structures. The large number of hydrogen-bonding donors afforded by the branched molecules resulted in a preferential association with water and hindered its access to the surface of the GO flakes, particularly in polymer-rich systems. The mapping of water translational dynamics revealed the existence of populations with distinctly different mobilities, depending upon the state of their association. The average rate of water transport was found to depend sensitively on the mobility of the freely to move molecules, which was varied strongly with composition. The rate of ionic transport was found to be very limited below a threshold in terms of polymer content. Both, water diffusivity and ionic transport were enhanced in the systems with the larger branched polymers, particularly with a lower polymer content, due to the higher availability of free volume for the respective moieties. The detail afforded in the present work provides a new insight for the fabrication of BPEI/GO composites with a controlled microstructure, enhanced stability and adjustable water transport and ionic mobility.
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Affiliation(s)
- Anastassia Rissanou
- Theoretical & Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece
| | - Apostolos Konstantinou
- Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Kostas Karatasos
- Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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5
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Liu Q, Chen M, Sun L, Liu G, Xu R. Pore density effect on separations of water/ethanol and methanol/ethanol through graphene oxide membranes: A theoretical study. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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6
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Costinas C, Salagean CA, Cotet LC, Baia M, Todea M, Magyari K, Baia L. Insights into the Stability of Graphene Oxide Aqueous Dispersions. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4489. [PMID: 36558342 PMCID: PMC9785193 DOI: 10.3390/nano12244489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/06/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
Understanding graphene oxide's stability (or lack thereof) in liquid solvents is critical for fine-tuning the material's characteristics and its potential involvement in future applications. In this work, through the use of structural and surface investigations, the alteration of the structural and edge-surface properties of 2D graphene oxide nanosheets was monitored over a period of eight weeks by involving DLS, zeta potential, XRD, XPS, Raman and FT-IR spectroscopy techniques. The samples were synthesized as an aqueous suspension by an original modified Marcano-Tour method centred on the sono-chemical exfoliation of graphite. Based on the acquired experimental results and the available literature, a phenomenological explanation of the two underlying mechanisms responsible for the meta-stability of graphene oxide aqueous dispersions is proposed. It is based on the cleavage of the carbon bonds in the first 3-4 weeks, while the bonding of oxygen functional groups on the carbon lattice occurs, and the transformation of epoxide and hydroxyl groups into adsorbed water molecules in a process driven by the availability of hydrogen in graphene oxide nanosheets.
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Affiliation(s)
- Codrut Costinas
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania
| | - Catalin Alexandru Salagean
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania
- Laboratory for Advanced Materials and Applied Technologies, Institute for Research, Development and Innovation in Applied Natural Sciences, Babeș-Bolyai University, Fântânele 30, RO-400294 Cluj-Napoca, Romania
| | - Liviu Cosmin Cotet
- Laboratory for Advanced Materials and Applied Technologies, Institute for Research, Development and Innovation in Applied Natural Sciences, Babeș-Bolyai University, Fântânele 30, RO-400294 Cluj-Napoca, Romania
- Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, Arany Janos 11, RO-400028 Cluj-Napoca, Romania
| | - Monica Baia
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania
- Laboratory for Advanced Materials and Applied Technologies, Institute for Research, Development and Innovation in Applied Natural Sciences, Babeș-Bolyai University, Fântânele 30, RO-400294 Cluj-Napoca, Romania
| | - Milica Todea
- Nanostructured Materials and Bio-Nano-Interfaces Centre, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, Treboniu Laurian 42, RO-400271 Cluj-Napoca, Romania
- Faculty of Medicine, Iuliu Hațieganu University of Medicine and Pharmacy, Victor Babeș 8, RO-400012 Cluj-Napoca, Romania
| | - Klara Magyari
- Nanostructured Materials and Bio-Nano-Interfaces Centre, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, Treboniu Laurian 42, RO-400271 Cluj-Napoca, Romania
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. Sqr. 1, 6720 Szeged, Hungary
| | - Lucian Baia
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania
- Laboratory for Advanced Materials and Applied Technologies, Institute for Research, Development and Innovation in Applied Natural Sciences, Babeș-Bolyai University, Fântânele 30, RO-400294 Cluj-Napoca, Romania
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7
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Paniagua-Guerra LE, Terrones M, Ramos-Alvarado B. Effects of Moisture and Synthesis-Derived Contaminants on the Mechanical Properties of Graphene Oxide: A Molecular Dynamics Investigation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:54924-54935. [PMID: 36459097 DOI: 10.1021/acsami.2c16161] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
This paper reports on the effects of the chemical composition of graphene oxide (GO) sheets on the mechanical properties of bulk GO. Three key factors were analyzed: (i) the oxygenated functional groups' concentration, (ii) the content of intersheet water (moisture), and (iii) the presence of residual contaminants observed from the synthesis of GO. Molecular dynamics simulations using the reactive force field ReaxFF were conducted to model tensile strength, indentation, and shear stress tests. The structural integrity of the carbon basal plane was the primary variable that determined mechanical behavior of GO slabs. Hydrogen-bond networks played an essential role in the tensile fracture mechanism, delaying the onset of fracture whenever strong hydrogen bonds existed in the intersheet space. The presence of interlayer sulfate ion contaminants negatively impacted the tensile strength, stiffness, and toughness of GO. Moreover, it was observed that intersheet sulfate ions improved the resistance to fracture of GO at low sulfur concentrations, while lower fracture strains were observed beyond a critical concentration. Alike the tensile stress findings, the indentation properties were determined by the integrity of the carbon basal plane. Our findings agree with experimental mechanical property measurements and reveal the importance of considering synthesis-derived contaminants in molecular models of GO.
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Affiliation(s)
- Luis E Paniagua-Guerra
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States
| | - Mauricio Terrones
- Department of Physics, Department of Chemistry, Department of Material Science and Engineering and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania16802, United States
- Research Initiative for Supra-Materials, Shinshu University, Nagano380-8553, Japan
| | - Bladimir Ramos-Alvarado
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States
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8
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Osma B, Pekcan Ö, Akın Evingür G. Kinetics models for
polyacrylamide‐graphene oxide
composites as antifoulant. POLYM ENG SCI 2022. [DOI: 10.1002/pen.26201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Büşra Osma
- Department of Naval Architecture and Mechanical Engineering, Faculty of Engineering Pîrî Reis University Istanbul Turkey
| | - Önder Pekcan
- Faculty of Engineering and Natural Sciences Kadir Has University Istanbul Turkey
| | - Gülşen Akın Evingür
- Department of Industrial Engineering, Faculty of Engineering Pîrî Reis University Istanbul Turkey
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9
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The Role of Oxidation Pattern and Water Content in the Spatial Arrangement and Dynamics of Oxidized Graphene-Based Aqueous Dispersions. Int J Mol Sci 2022; 23:ijms232113459. [DOI: 10.3390/ijms232113459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/31/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
In this work, we employ fully atomistic molecular dynamics simulations to elucidate the effects of the oxidation pattern and of the water content on the organization of graphene sheets in aqueous dispersions and on the dynamic properties of the different moieties at neutral pH conditions. Analysis of the results reveals the role of the oxidation motif (peripherally or fully oxidized flakes) in the tendency of the flakes to self-assemble and in the control of key structural characteristics, such as the interlayer distance between the sheets and the average size and the distribution of the formed aggregates. In certain cases, the results are compared to a pertinent experimental system, validating further the relevant computational models. Examination of the diffusional motion of the oxidized flakes shows that different degrees of spatial restriction are imposed upon the decrease in the water content and elucidates the conditions under which a motional arrest of the flakes takes place. At constant water content, the structural differences between the formed aggregates appear to additionally impart distinct diffusional characteristics of a water molecule. A detailed examination of the counterion dynamics describes their interaction with the oxidized flakes and their dependence on the water content and on the oxidation pattern, offering new insight into the expected electrical properties of the dispersions. The detailed information provided by this work will be particularly useful in applications such as molecular sieving, nanofiltration, and in cases where conductive membranes based on oxidized forms of graphene are used.
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10
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Narayanam PK, Vishwakarma RK, Polaki S. Fabrication of Free Standing Graphene Oxide Membranes for Efficient Adsorptive Removal of Cationic Dyes. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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11
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Sun T, Zhu Z. Light resonantly enhances the permeability of functionalized membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Wang Q, Qu Z, Zhang X, Chen L. Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37608-37619. [PMID: 35917159 DOI: 10.1021/acsami.2c06687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Osmotic energy conversion features directional ion migration in selective nanochannels, dominated by interfacial effects, temperature, and concentration. Current efforts emphasize membrane modification for superior reliability and durability, whereas the origin and implication of interfacial effects are unclear. This work performs ab initio molecular dynamics simulations for hydrated ion-graphene oxide interfaces by regulating the temperature and concentration. The interfacial effects associated with their induced anisotropic ion diffusion and ion selectivity are revealed. The scientific essence of the interfacial effects is an electron transfer triggered by hydrated ion-functional group interactions. The interfacial effects are clarified to include dynamic solvation structures, interfacial H-bonds, and chemical reactions. Ions possess incomplete hydration shells, and their arrangements vary from ordered to disordered to overlapped. Interfacial H-bonds restrict hydrated ions by constraining water molecules, whereas continuous reactions provide lateral pathways to generate anisotropy. Cation selectivity is further clarified by negative surface charges from hydroxyl deprotonation. Besides, temperature rise induces disordered hydrated ions as well as frequent and violent reactions, enhancing ion diffusion, selectivity, and anisotropy; excessive concentrations produce overlapped hydrated ions, more H-bonds, and inferior reactions, weakening ion diffusion, selectivity, and anisotropy. Finally, the bottom-up concept for osmotic energy conversion is summarized, and elevated temperature combined with low concentration is found to boost ion diffusion and ion selectivity synergistically. This work provides an in-depth understanding of interfacial phenomena and ion behaviors in nanochannels.
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Affiliation(s)
- Qiang Wang
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zhiguo Qu
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Xu Zhang
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Liang Chen
- MOE Key Laboratory of Thermal-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
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13
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The role of surface ionisation in the hydration-induced swelling of graphene oxide membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Lyu S, Tang Z, Song Q, Yang Z, Duan Y. Formation of Liquid Film in Heterogeneous Condensation of Water Vapor: Effects of Solid-Fluid Interaction and Sulfuric Acid Component. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7085-7097. [PMID: 35617688 DOI: 10.1021/acs.langmuir.2c00949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the phenomenon of filmwise condensation on solid surfaces is vital for industrial processes such as air pollutant control and desalination. In this work, we study the formation of condensed liquid films via molecular dynamics simulations, and the effects of solid-fluid interactions and the sulfuric acid component are given major attention. Water is chosen as the fluid, while the solid-fluid interaction is modified to characterize different solid surfaces. The results show that as the solid-fluid interaction decreases, the solid surface transforms from a completely wetting surface to a partially wetting surface, and the film formation process shows significant differences. The condensed liquid on the completely wetting surface forms small liquid films, which merge to form a complete film covering the surface. With the enhancement of solid-fluid interaction, the condensation rate increases first and then remains virtually invariant, resulting in a film formation time that decreases first and then maintains constant. The condensed liquid on the partially wetting surfaces appears as nanodroplets, and the coalescence between nanodroplets leads to the formation of the liquid film. It is found that the stronger the solid-fluid interaction, the more the coalesced droplets tend to be pinned at nucleation sites, the easier it is to form a liquid film, and the shorter the time required for droplet merging. The sulfuric acid component accelerates liquid film formation on both completely wetting and partially wetting surfaces, but the effect of sulfuric acid is more significant on partially wetting surfaces. The 5% molar fraction of sulfuric acid reduces the nucleation time by 72% and increases the condensation rate by 137% under partial wetting, while the same amount of sulfuric acid only increases the nucleation rate by 6% on the completely wetting surface.
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Affiliation(s)
- Shuhang Lyu
- Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, People's Republic of China
| | - Zuozhou Tang
- Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, People's Republic of China
| | - Qiang Song
- Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, People's Republic of China
| | - Zhen Yang
- Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yuanyuan Duan
- Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, People's Republic of China
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15
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Majidi S, Erfan-Niya H, Azamat J, Cruz-Chú ER, Honoré Walther J. The performance of a C2N membrane for heavy metal ions removal from water under external electric field. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120770] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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16
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Tan S, Zhang D, Nguyen MT, Shutthanandan V, Varga T, Rousseau R, Johnson GE, Glezakou VA, Prabhakaran V. Tuning the Charge and Hydrophobicity of Graphene Oxide Membranes by Functionalization with Ionic Liquids at Epoxide Sites. ACS APPLIED MATERIALS & INTERFACES 2022; 14:19031-19042. [PMID: 35420797 DOI: 10.1021/acsami.2c02366] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Functionalization of graphene oxide (GO) membranes is generally achieved using carboxyl groups as binding sites for ligands. Herein, by taking advantage of the ability of imidazolium-based ionic liquids (ILs) to undergo an epoxide ring-opening reaction, a new approach of GO modification was established, in which ILs were bonded to the abundant epoxides on GO without sacrificing the carboxyl groups. Computational methods confirmed this unique configuration of ILs on GO, which enabled the dispersion of IL/GO flakes in water for facile casting into laminate membranes. Compared with neat GO, the ILs in IL/GO membranes served as spacers that substantially reduced the multi-valent cation mobility, simultaneously facilitated ion desolvation, and increased the water flux across the membrane. Our studies found that the higher separation efficiency of IL/GO membranes may be attributed to the synergistic modification of the hydrophobicity and surface charge. Specifically, the protonated nitrogen of the imidazolium cations altered the surface charge of GO, thereby generating electrostatic repulsion that enhanced the selectivity of cation rejection. On the other hand, the increased length of the alkyl chains bound to the imidazolium rings was found to increase the hydrophobicity of GO, which, in turn, aided the fine-tuning of the water desolvation/transport dynamics at the GO/IL interface to achieve a high water flux. Additionally, the water retention was reduced on the hydrophobic planes, which inhibited GO swelling during aqueous separations. Molecular dynamics simulations revealed increased water diffusivity when ILs were intercalated within GO layers. We establish that without requiring a high energy input, functionalization of GO membranes with ILs may be a promising approach to achieve efficient ion separation and critical material recovery.
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Affiliation(s)
- Shuai Tan
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Difan Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Manh-Thuong Nguyen
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Vaithiyalingam Shutthanandan
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Tamas Varga
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Roger Rousseau
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Grant E Johnson
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Vassiliki-Alexandra Glezakou
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Venkateshkumar Prabhakaran
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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Stability of Graphene Oxide Composite Membranes in an Aqueous Environment from a Molecular Point of View. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073460] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We used molecular dynamics to investigate the stability of graphene oxide (GO) layers supported on three polymeric materials, namely a polyvinylidene fluoride (PVDF), a pristine and a crosslinked polyamide–imide (PAI and PAI-cr). The membrane configurations consisted of a few layers of GO nanosheets stacked over the specified polymeric supports and submerged in water. We monitored the position, the tilt angle, and the radial distribution function of the individual GO nanosheets in respect to the plane of the supports. We showed that the outermost GO nanosheets were more distorted than those attached directly on the supports. The greatest distortion was observed for the GO nanosheets of the PVDF-supported system. Next, we recorded the density profiles of the water molecules across the distance from the layers to the polymer and discussed the hydrogen bonds between water hydrogens and the oxygen atoms of the GO functional groups.
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Maheshwari R, Gadeval A, Raval N, Kalia K, Tekade RK. Laser activatable nanographene colloids for chemo-photothermal combined gene therapy of triple-negative breast cancer. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 133:112605. [PMID: 35525767 DOI: 10.1016/j.msec.2021.112605] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 12/01/2021] [Accepted: 12/07/2021] [Indexed: 11/16/2022]
Abstract
This investigation reports the green approach for developing laser activatable nanoscale-graphene colloids (nGC-CO-FA) for chemo-photothermal combined gene therapy of triple-negative breast cancer (TNBC). The nano colloid was found to be nanometric as characterized by SEM, AFM, and zeta sizer (68.2 ± 2.1 nm; 13.8 ± 1.2 mV). The doxorubicin (Dox) loaded employing hydrophobic interaction/π-π stacking showed >80% entrapment efficiency with a sustained pH-dependent drug release profile. It can efficiently incorporate siRNA and Dox and successfully co-localize them inside TNBC cells to obtain significant anticancer activity as evaluated using CCK-8 assay, apoptosis assay, cell cycle analysis, cellular uptake, fluorescence assay, endosomal escape study, DNA content analysis, and gene silencing efficacy studies. nGC-CO-FA/Dox/siRNA released the Dox in temperature- and a pH-responsive manner following NIR-808 laser irradiation. The synergistic photo-chemo-gene therapy using near infrared-808 nm laser (NIR-808) irradiation was found to be more effective as compared to without NIR-808 laser-treated counterparts (∆T: 37 ± 1.1 °C → to 49.2 ± 3.1 °C; 10 min; 0.5 W/cm2), suggesting the pivotal role of photothermal combined gene-therapy in the treatment of TNBC.
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Affiliation(s)
- Rahul Maheshwari
- National Institute of Pharmaceutical Education and Research-Ahmedabad (NIPER-A), An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar 382355, Gujarat, India
| | - Anuradha Gadeval
- National Institute of Pharmaceutical Education and Research-Ahmedabad (NIPER-A), An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar 382355, Gujarat, India
| | - Nidhi Raval
- National Institute of Pharmaceutical Education and Research-Ahmedabad (NIPER-A), An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar 382355, Gujarat, India
| | - Kiran Kalia
- National Institute of Pharmaceutical Education and Research-Ahmedabad (NIPER-A), An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar 382355, Gujarat, India
| | - Rakesh Kumar Tekade
- National Institute of Pharmaceutical Education and Research-Ahmedabad (NIPER-A), An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar 382355, Gujarat, India.
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Zhao WJ, Liang L, Kong Z, Shen JW. A review on desalination by graphene-based biomimetic nanopore: From the computational modelling perspective. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117582] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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20
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Sun C, Zhou R, Zhao Z, Bai B. Unveiling the hydroxyl-dependent viscosity of water in graphene oxide nanochannels via molecular dynamics simulations. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138808] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Weng PE, Gooyandeh A, Tariq M, Li T, Godara A, Valenzuela J, Mancini S, Yeung SMT, Sosa R, Wagner DR, Dhall R, Adelstein N, Kao K, Oh D. Microbe-Assisted Nanocomposite Anodes for Aqueous Li-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2021; 13:39195-39204. [PMID: 34387480 DOI: 10.1021/acsami.1c07309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
With the rapid increase in the use of lithium-ion batteries (LIBs), the development of safe LIBs has become an important social issue. Replacing flammable organic liquid electrolytes in current LIBs with water can be an alternative route to resolve this safety concern. The water-in-salt (WIS) electrolytes received great attention as next-generation electrolytes due to their large electrochemical stability window. However, their high cathodic limit remains as a challenge, impeding the use of low-potential anodes. Here, we report the first biodirected synthesis of carbonaceous layers on anodes to use them as interlayers that prevent a direct contact of water molecules to anode particles. High-aspect ratio microbes are utilized as precursors of carbonaceous layers on TiO2 nanoparticles (m-TiO2) to enhance the conductivity and to reduce the electrolysis of WIS electrolytes. We selected the cylindrical shape of microbes that offers geometric diversity, providing us a toolkit to investigate the effect of microbe length in forming the network in binary composites and their impacts on the battery performance with WIS electrolytes. Using microbes with varying aspect ratios, the optimal microbe size to maximize the battery performance is determined. The effects of storage time on microbe size are also studied. Compared to uncoated TiO2 anodes, m-TiO2 exhibited 49% higher capacity at the 40th cycle and enhanced the cycle life close to anodes made with a conventional carbon precursor while using an 11% less amount of carbon. We performed density functional theory calculations to unravel the underlying mechanism of the performance improvement using microbe-derived carbon layers. Computational results show that high amounts of pyridinic nitrogen present in the peptide bonds in microbes are expected to slow down the water diffusion. Our findings provide key insights into the design of an interlayer for WIS anodes and open an avenue to fabricate energy storage materials using biomaterials.
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Affiliation(s)
- Pei-En Weng
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Alexander Gooyandeh
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Muhammad Tariq
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Tianyu Li
- Department of Chemical Engineering, Texas A&M University, Jack E. Brown Engineering Building, 3122 TAMU, College Station, Texas 77843, United States
| | - Avinash Godara
- Department of Chemical Engineering, Texas A&M University, Jack E. Brown Engineering Building, 3122 TAMU, College Station, Texas 77843, United States
| | - Jocelyn Valenzuela
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Steven Mancini
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Samuel Ming Tuk Yeung
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Ruth Sosa
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - David R Wagner
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Rohan Dhall
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley 94720, California, United States
| | - Nicole Adelstein
- Department of Chemistry and Biochemistry, San Francisco State University, 1600 Holloway Avenue, San Francisco, California 94312, United States
| | - Katy Kao
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
| | - Dahyun Oh
- Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States
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22
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Chen C, Huang F, Jia L, Zhang L, Chen E, Liang L, Kong Z, Wang X, Zhang W, Shen JW. Molecular insights into desalination performance of lamellar graphene membranes: Significant of hydrophobicity and interlayer spacing. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116024] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Tonel MZ, Zanella I, Fagan SB. Theoretical study of small aromatic molecules adsorbed in pristine and functionalised graphene. J Mol Model 2021; 27:193. [PMID: 34057615 DOI: 10.1007/s00894-021-04806-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 05/25/2021] [Indexed: 10/21/2022]
Abstract
Small aromatic molecules are precursors for several biological systems such as DNA, proteins, drugs, and are also present in several pollutants. The understanding of the interaction of these small aromatic molecules with pristine and functionalised graphene (fGr) can generate different applications. We performed ab initio simulations based on the density functional theory to evaluate the interaction between the aromatic compounds, benzene, benzoic acid, aniline and phenol, with pristine and fGr. The results show that the binding energy for all cases is less than 103.24 kJ/mol (1.07 eV) without substantial modification of the electronic properties, indicating that the interaction occurs through a physical adsorption regime. The results are promising because they suggest that pristine graphene and functionalised graphene are suitable for removing these pollutants, or for carrying molecules for biological applications influenced by π-π and H-bonds interaction.
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Affiliation(s)
- Mariana Zancan Tonel
- Physics Department, Universidade Franciscana-UFN, Rua dos Andradas, 1614, ZIP, Santa Maria, RS, 97010-032, Brazil.
| | - Ivana Zanella
- Physics Department, Universidade Franciscana-UFN, Rua dos Andradas, 1614, ZIP, Santa Maria, RS, 97010-032, Brazil
| | - Solange Binotto Fagan
- Physics Department, Universidade Franciscana-UFN, Rua dos Andradas, 1614, ZIP, Santa Maria, RS, 97010-032, Brazil
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Catalytic Reduction of Graphene Oxide Membranes and Water Selective Channel Formation in Water-Alcohol Separations. MEMBRANES 2021; 11:membranes11050317. [PMID: 33925914 PMCID: PMC8145515 DOI: 10.3390/membranes11050317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/07/2021] [Accepted: 04/14/2021] [Indexed: 11/16/2022]
Abstract
Graphene oxide (GO) is a promising membrane system for chemical separation applications due to its 2-D nanofluidics properties and an ability to control interplanar spacing for selectivity. The permeance of water, methanol (MeOH) and isopropyl alcohol (IPA) through 5 µm thick membranes was found to be 0.38 ± 0.15, 0.33 ± 0.16 and 0.42 ± 0.31 LMH/bar (liter/m2·h·bar), respectively. Interestingly, the permeance of a water-alcohol mixture was found to be dramatically lower (~0.01 LMH/bar) than any of its components. Upon removing the solvent mixture, the transmembrane flux of the pure solvent was recovered to near the original permeance. The interlayer space of a dried GO membrane was found to be 8.52 Å, which increased to 12.19 Å. 13.26 Å and 16.20 Å upon addition of water, MeOH and IPA. A decrease in d-space, about 2 Å, was consistently observed when adding alcohol to water wetted GO membrane and an optical color change and reduction in permeance. A newly proposed mechanism of a partial reduction of GO through a catalytic reaction with the water-alcohol mixture is consistent with experimental observations.
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25
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Rawal A, Che Man SH, Agarwal V, Yao Y, Thickett SC, Zetterlund PB. Structural Complexity of Graphene Oxide: The Kirigami Model. ACS APPLIED MATERIALS & INTERFACES 2021; 13:18255-18263. [PMID: 33797212 DOI: 10.1021/acsami.1c01157] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Investigation of highly oxidized graphene oxide (GO) by solid-state nuclear magnetic resonance (NMR) spectroscopy has revealed an exceptional level of hitherto undiscovered structural complexity. A number of chemical moieties were observed for the first time, such as terminal esters, furanic carbons, phenolic carbons, and three distinct aromatic and two distinct alkoxy carbon moieties. Quantitative one-dimensional (1D) and two-dimensional (2D) 13C{1H} NMR spectroscopy established the relative populations and connectivity of these different moieties to provide a consistent "local" chemical structure model. An inferred 2 nm GO sheet size from a very large (∼20%) edge carbon fraction by NMR analysis is at odds with the >20 nm sheet size determined from microscopy and dynamic light scattering. A proposed kirigami model where extensive internal cuts/tears in the basal plane provide the necessary edge sites is presented as a resolution to these divergent results. We expect this work to expand the fundamental understanding of this complex material and enable greater control of the GO structure.
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Affiliation(s)
- Aditya Rawal
- NMR Facility, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Siti H Che Man
- Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Vipul Agarwal
- Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Yin Yao
- Electron Microscopy Unit, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Stuart C Thickett
- Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Per B Zetterlund
- Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
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Lim EB, Vy TA, Lee SW. Comparative release kinetics of small drugs (ibuprofen and acetaminophen) from multifunctional mesoporous silica nanoparticles. J Mater Chem B 2021; 8:2096-2106. [PMID: 32068205 DOI: 10.1039/c9tb02494h] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Multifunctional mesoporous silica nanoparticles (MSNs) can confer dynamically varied release kinetics depending on the intermolecular interactions between model drugs and functional decorations on the MSNs. Herein, brush-like fluorescent conjugates were grafted on the pore walls of pristine MSNs for high drug loading and to impart fluorescence properties. The fluorescent MSNs (FMSNs) were further coated with polydopamine (PDA) and graphene oxide (GO) double layer, designated FMSNs@PDA and FMSNs@PDA@GO, respectively. The FMSNs@PDA@GO exhibited highly consistent drug release over one week (∼7 days) because of the consolidated PDA/GO double layer at neutral pH (7.4). However, the release rate of FMSN-Ibu@PDA@GO was increased at acidic pH (5.5) because the PDA/GO double layer was partially disrupted due to weakened π-π stacking and electrostatic interactions. The release kinetics of the FMSNs-based NPs (FMSNs, FMSNs@PDA, and FMSNs@PDA@GO) were systematically investigated using negatively charged hydrophobic ibuprofen and neutral hydrophilic acetaminophen at pH 7.4. In the FMSN-drug system, the release rate of acetaminophen was higher than that of ibuprofen because of the higher solubility of acetaminophen in aqueous solution. In addition, ibuprofen has a bulky molecular structure compared to acetaminophen, leading to its slower transmission through the porous channels of FMSNs. In the FMSNs-drug@PDA system, acetaminophen exhibited a slower release rate than ibuprofen, owing to the π-π stacking interactions in the transmission of neutral acetaminophen by the PDA coating layer. On the other hand, the FMSNs-drug@PDA@GO exhibited a slower ibuprofen release rate than acetaminophen, owing to the electrostatic repulsion effect of the negative GO layer. Our drug delivery system was demonstrated as an advanced delivery platform, in which the transmission rate is controlled by intermolecular interactions between the diffusing drugs and functional decorations on the nanocarrier.
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Affiliation(s)
- Eun-Bi Lim
- Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnamdaero, Seongnam-si 13120, Republic of Korea.
| | - Tran Anh Vy
- Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnamdaero, Seongnam-si 13120, Republic of Korea.
| | - Sang-Wha Lee
- Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnamdaero, Seongnam-si 13120, Republic of Korea.
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Zhang M, Sun B, Luo A, Huang S, Zhang X. Electrodialysis based direct air dehumidification: A molecular dynamics study on moisture diffusion and separation through graphene oxide membrane. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Molecular dynamics study at N 2/H 2O-rGO interfaces for nitrogen reduction reaction. J Mol Graph Model 2021; 104:107840. [PMID: 33524923 DOI: 10.1016/j.jmgm.2021.107840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 01/03/2021] [Accepted: 01/05/2021] [Indexed: 11/23/2022]
Abstract
It is an emerging trend to develop synthetic ammonia via nitrogen reduction reaction(NRR) by using simple, economical and efficient catalysts under mild conditions. Due to the intrinsic rich-functional groups of the surface, its versatile tailorability and the true stability among all the two-dimensional materials, reduced graphene oxide (rGO) is drawing a rising attention of researchers to the NRR application. However, due to the hydrophobicity of C and hydrophilicity of oxygen-containing groups of rGO, the interface dynamics between rGO surface and N2 and H2O molecules, which are two basic precursors for catalytic NRR are still unclear up to date. Herein, we propose to explore this problem by constructing a hierarchical model for rGO-N2/H2O interface interaction and conducting molecular dynamics (MD) simulation at ambient conditions. We find a way to tune the function groups to maximize the adsorption of N2 and H2O molecules at the same time. H2O molecules are more likely to form hydrogen bonds with oxygen-containing groups of rGO in the near range. While in the remote region, N2 molecules tend to form non-bonding interactions with pure C atoms without oxygen-containing groups of rGO. These results will provide theoretical guidance for NRR based on rGO and rGO based materials.
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Mechanical Properties of Graphene Oxide Coupled by Multi-Physical Field: Grain Boundaries and Functional Groups. CRYSTALS 2021. [DOI: 10.3390/cryst11010062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Graphene and graphene oxide (GO) usually have grain boundaries (GBs) in the process of synthesis and preparation. Here, we “attach” GBs into GO, a new molecular configuration i.e., polycrystalline graphene oxide (PGO) is proposed. This paper aims to provide an insight into the stability and mechanical properties of PGO by using the molecular dynamics method. For this purpose, the “bottom-up” multi-structure-spatial design performance of PGO and the physical mechanism associated with the spatial structure in mixed dimensions (combination of sp2 and sp3) were studied. Also, the effect of defect coupling (GBs and functional groups) on the mechanical properties was revealed. Our results demonstrate that the existence of the GBs reduces the mechanical properties of PGO and show an “induction” role during the tensile fracture process. The presence of functional groups converts in-plane sp2 carbon atoms into out-of-plane sp3 hybrid carbons, causing uneven stress distribution. Moreover, the mechanical characteristics of PGO are very sensitive to the oxygen content of functional groups, which decrease with the increase of oxygen content. The weakening degree of epoxy groups is slightly greater than that of hydroxyl groups. Finally, we find that the mechanical properties of PGO will fall to the lowest values due to the defect coupling amplification mechanism when the functional groups are distributed at GBs.
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Graphene Oxide Membranes for Trace Hydrocarbon Contaminant Removal from Aqueous Solution. NANOMATERIALS 2020; 10:nano10112242. [PMID: 33198157 PMCID: PMC7697333 DOI: 10.3390/nano10112242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 02/05/2023]
Abstract
The aim of this paper is to shed light on the application of graphene oxide (GO) membranes for the selective removal of benzene, toluene, and xylene (BTX) from wastewater. These molecules are present in traces in the water produced from oil and gas plants and are treated now with complex filtration systems. GO membranes are obtained by a simple, fast, and scalable method. The focus of this work is to prove the possibility of employing GO membranes for the filtration of organic contaminants present in traces in oil and gas wastewater, which has never been reported. The stability of GO membranes is analyzed in water solutions with different pH and salinity. Details of the membrane preparation are provided, resulting in a crucial step to achieve a good filtration performance. Material characterization techniques such as electron microscopy, x-ray diffraction, and infrared spectroscopy are employed to study the physical and chemical structure of GO membranes, while gas chromatography, UV-visible spectroscopy, and gravimetric techniques allow the quantification of their filtration performance. An impressive rejection of about 90% was achieved for 1 ppm of toluene and other pollutants in water, demonstrating the excellent performance of GO membranes in the oil and gas field.
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Iakunkov A, Talyzin AV. Swelling properties of graphite oxides and graphene oxide multilayered materials. NANOSCALE 2020; 12:21060-21093. [PMID: 33084722 DOI: 10.1039/d0nr04931j] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Graphite oxide (GtO) and graphene oxide (GO) multilayered laminates are hydrophilic materials easily intercalated by water and other polar solvents. By definition, an increase in the volume of a material connected to the uptake of a liquid or vapour is named swelling. Swelling is a property which defines graphite oxides and graphene oxides. Less oxidized materials not capable of swelling should be named oxidized graphene. The infinite swelling of graphite oxide yields graphene oxide in aqueous dispersions. Graphene oxide sheets dispersed in a polar solvent can be re-assembled into multilayered structures and named depending on applications as films, papers or membranes. The multilayered GO materials exhibit swelling properties which are mostly similar to those of graphite oxides but not identical and in some cases surprisingly different. Swelling is a key property of GO materials in all applications which involve the sorption of water/solvents from vapours, immersion of GO into liquid water/solvents and solution based chemical reactions. These applications include sensors, sorption/removal of pollutants from waste waters, separation of liquid and gas mixtures, nanofiltration, water desalination, water-permeable protective coatings, etc. Swelling defines the distance between graphene oxide sheets in solution-immersed GO materials and the possibility for penetration of ions and molecules inside of interlayers. A high sorption capacity of GO towards many molecules and cations is defined by swelling which makes the very high surface area of GO accessible. GtO and GO swelling is a surprisingly complex phenomenon which is manifested in a variety of different ways. Swelling is strongly different for materials produced using the most common Brodie and Hummers oxidation procedures; it depends on the degree of oxidation, ad temperature and pressure conditions. The value of the GO interlayer distance is especially important in membrane applications. Diffusion of solvent molecules and ions is defined by the size of "permeation channels" provided by the swelled GO structure. According to extensive studies performed over the last decade the exact value of the inter-layer distance in swelled GO depends on the nature of solvent, temperature and pressure conditions, and the pH and concentration of solutions and exhibits pronounced aging effects. This review provides insight into the fundamental swelling properties of multilayered GO and demonstrates links to advanced applications of these materials.
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Affiliation(s)
- Artem Iakunkov
- Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
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Oh Y, Choi HK, Jung H, Jin JU, Kim YK, You NH, Ku BC, Kim Y, Yu J. Analysis of the effect of organic solvent-sheet interfacial interaction on the exfoliation of sulfur-doped reduced graphene oxide sheets in a solvent system using molecular dynamics simulations. Phys Chem Chem Phys 2020; 22:20665-20672. [PMID: 32895677 DOI: 10.1039/d0cp03498c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this study, the effect of interfacial interaction between solvent and sheets on the exfoliation of sulfur-doped reduced graphene oxide (SrGO) sheets was studied, using molecular dynamics simulations. Four organic solvents of toluene, tetrahydrofuran, N-methyl-2-pyrrolidone, and sulfolane, were used in this simulation. An insertion simulation considering the size effect of insertion molecules was used to determine the insertion efficiency of the solvent molecules. The insertion efficiency of toluene was the best among the four solvents due to the influence of the effective thickness of the solvent. An exfoliation simulation considering electrostatic interaction was conducted to evaluate the exfoliation efficiency of the SrGO sheets. Unlike the insertion efficiency case, the sulfolane was found to have the best exfoliation efficiency among the four solvents, due to the strong electrostatic repulsion and weak attractive energy between the SrGO sheets. The exfoliation efficiency of the SrGO sheets was improved by increasing the sulfur content and the ratio of the thiol type to the total number of sulfur-doped groups. These results reveal that decreasing the attractive energy and increasing the electrostatic repulsion between the solvent and SrGO sheets are a useful way to improve the exfoliation efficiency of SrGO sheets.
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Affiliation(s)
- Yuna Oh
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea. and Department of Mechanical Design Engineering, Jeonbuk National University, Baekje-daero 567, Deokjin-gu, Jeonju, Jeollabukdo, 54896, Korea
| | - Hoi Kil Choi
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
| | - Hana Jung
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
| | - Jeong-Un Jin
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
| | - Young-Kwan Kim
- Department of Chemistry, Dongguk University, Seoul 100-715, South Korea
| | - Nam-Ho You
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
| | - Bon-Cheol Ku
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
| | - Yonjig Kim
- Department of Mechanical Design Engineering, Jeonbuk National University, Baekje-daero 567, Deokjin-gu, Jeonju, Jeollabukdo, 54896, Korea
| | - Jaesang Yu
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabukdo, 55324, Korea.
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33
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Ahmadvand H, Iraji Zad A, Mohammadpour R, Hosseini-Shokouh SH, Asadian E. Room temperature and high response ethanol sensor based on two dimensional hybrid nanostructures of WS 2/GONRs. Sci Rep 2020; 10:14799. [PMID: 32908162 PMCID: PMC7481777 DOI: 10.1038/s41598-020-71695-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 08/19/2020] [Indexed: 11/26/2022] Open
Abstract
Here in this research, room temperature ethanol and humidity sensors were prepared based on two dimensional (2D) hybrid nanostructures of tungsten di-sulfide (WS2) nanosheets and graphene oxide nanoribbons (GONRs) as GOWS. The characterization results based on scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (ESD), Raman spectroscopy and X-ray diffraction (XRD) analysis confirmed the hybrid formations. Ethanol sensing of drop-casted GOWS films on SiO2 substrate indicated increasing in gas response up to 5 and 55 times higher compared to pristine GONRs and WS2 films respectively. The sensing performance of GOWS hybrid nanostructures was investigated in different concentrations of WS2, and the highest response was about 126.5 at 1 ppm of ethanol in 40% relative humidity (R.H.) for WS2/GONRs molar ratio of 10. Flexibility of GOWS was studied on Kapton substrate with bending radius of 1 cm, and the gas response decreased less than 10% after 30th bending cycles. The high response and flexibility of the sensors inspired that GOWS are promising materials for fabrication of wearable gas sensing devices.
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Affiliation(s)
- Hassan Ahmadvand
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran
| | - Azam Iraji Zad
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran.
- Department of Physics, Sharif University of Technology, 14588, Tehran, Iran.
| | - Raheleh Mohammadpour
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran.
| | | | - Elham Asadian
- Department of Medical Physics and Biomedical Engineering, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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34
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Liu Q, Chen M, Mao Y, Liu G. Theoretical study on Janus graphene oxide membrane for water transport. Front Chem Sci Eng 2020. [DOI: 10.1007/s11705-020-1954-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
Nanoconfined fluids (NCFs), which are confined in nanospaces, exhibit distinctive nanoscale effects, including surface effects, small-size effects, quantum effects, and others. The continuous medium hypothesis in fluid mechanics is not valid in this context because of the comparable characteristic length of spaces and molecular mean free path, and accordingly, the classical continuum theories developed for the bulk fluids usually cannot describe the mass and energy transport of NCFs. In this Perspective, we summarize the nanoscale effects on the thermodynamics, mass transport, flow dynamics, heat transfer, phase change, and energy transport of NCFs and highlight the related representative works. The applications of NCFs in the fields of membrane separation, oil and gas production, energy harvesting and storage, and biological engineering are especially indicated. Currently, the theoretical description framework of NCFs is still missing, and it is expected that this framework can be established by adopting the classical continuum theories with the consideration of nanoscale effects.
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Affiliation(s)
- Chengzhen Sun
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
| | - Runfeng Zhou
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
| | - Zhixiang Zhao
- School of Urban Planning and Municipal Engineering, Xi'an Polytechnic University, Shaanxi 710048, China
| | - Bofeng Bai
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
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36
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M R, Ayappa KG. Dynamical Transitions of Supercooled Water in Graphene Oxide Nanopores: Influence of Surface Hydrophilicity. J Phys Chem B 2020; 124:4805-4820. [DOI: 10.1021/acs.jpcb.0c02052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Rajasekaran M
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, India 560012
| | - K. Ganapathy Ayappa
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, India 560012
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, India 560012
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37
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Hung WS, Lai YL, Lee PH, Chiao YH, Sengupta A, Sivakumar M, Lee KR, Lai JY. Tuneable interlayer spacing self-assembling on graphene oxide-framework membrane for enhance air dehumidification. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116499] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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38
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Mouhat F, Coudert FX, Bocquet ML. Structure and chemistry of graphene oxide in liquid water from first principles. Nat Commun 2020; 11:1566. [PMID: 32218448 PMCID: PMC7099009 DOI: 10.1038/s41467-020-15381-y] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 03/04/2020] [Indexed: 12/03/2022] Open
Abstract
Graphene oxide is a rising star among 2D materials, yet its interaction with liquid water remains a fundamentally open question: experimental characterization at the atomic scale is difficult, and modeling by classical approaches cannot properly describe chemical reactivity. Here, we bridge the gap between simple computational models and complex experimental systems, by realistic first-principles molecular simulations of graphene oxide (GO) in liquid water. We construct chemically accurate GO models and study their behavior in water, showing that oxygen-bearing functional groups (hydroxyl and epoxides) are preferentially clustered on the graphene oxide layer. We demonstrated the specific properties of GO in water, an unusual combination of both hydrophilicity and fast water dynamics. Finally, we evidence that GO is chemically active in water, acquiring an average negative charge of the order of 10 mC m-2. The ab initio modeling highlights the uniqueness of GO structures for applications as innovative membranes for desalination and water purification.
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Affiliation(s)
- Félix Mouhat
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 Rue Lhomond 75005, Paris, France
| | - François-Xavier Coudert
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, 75005, Paris, France
| | - Marie-Laure Bocquet
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 Rue Lhomond 75005, Paris, France.
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39
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Li W, Zhang L, Zhang X, Zhang M, Liu T, Chen S. Atomic insight into water and ion transport in 2D interlayer nanochannels of graphene oxide membranes: Implication for desalination. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117744] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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40
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Improved water permeability and structural stability in a polysulfone-grafted graphene oxide composite membrane used for dye separation. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117547] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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41
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M R, Ayappa KG. Influence of surface hydrophilicity and hydration on the rotational relaxation of supercooled water on graphene oxide surfaces. Phys Chem Chem Phys 2020; 22:16080-16095. [DOI: 10.1039/d0cp01515f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The presence of a bulk water film influences the dynamical transitions of supercooled water on graphene oxide surfaces.
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Affiliation(s)
- Rajasekaran M
- Department of Chemical Engineering
- Indian Institute of Science
- Bangalore
- India
| | - K. Ganapathy Ayappa
- Department of Chemical Engineering
- Indian Institute of Science
- Bangalore
- India
- Centre for Biosystems Science and Engineering
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42
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Bahamon D, Vega LF. Molecular simulations of phenol and ibuprofen removal from water using multilayered graphene oxide membranes. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1662129] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- D. Bahamon
- Chemical Engineering Department, Khalifa University, Abu Dhabi, UAE
- Research and Innovation Center on CO2 and H2 (RICH), Catalysis and Separation Center (CeCaS), Khalifa University, Abu Dhabi, UAE
| | - L. F. Vega
- Chemical Engineering Department, Khalifa University, Abu Dhabi, UAE
- Research and Innovation Center on CO2 and H2 (RICH), Catalysis and Separation Center (CeCaS), Khalifa University, Abu Dhabi, UAE
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43
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Jafarzadeh R, Azamat J, Erfan-Niya H. Water desalination across functionalized silicon carbide nanosheet membranes: insights from molecular simulations. Struct Chem 2019. [DOI: 10.1007/s11224-019-01405-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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44
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Williams CD, Carbone P, Siperstein FR. In Silico Design and Characterization of Graphene Oxide Membranes with Variable Water Content and Flake Oxygen Content. ACS NANO 2019; 13:2995-3004. [PMID: 30785717 PMCID: PMC7005941 DOI: 10.1021/acsnano.8b07573] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 02/20/2019] [Indexed: 06/09/2023]
Abstract
Graphene oxide (GO) membranes offer exceptional promise for certain aqueous separation challenges, such as desalination. Central to unlocking this promise and optimizing performance for a given separation is the establishment of a detailed molecular-level understanding of how the membrane's composition affects its structural and transport properties. This understanding is currently lacking, in part due to the fact that, until recently, molecular models with a realistic distribution of oxygen functionalities and interlayer flake structure were unavailable. To understand the effect of composition on the properties of GO membranes, models with water contents and oxygen contents, varying between 0% and 40% by weight, were prepared in this work using classical molecular dynamics simulations. The change in membrane interlayer distance distribution, water connectivity, and water diffusivity with water and oxygen content was quantified. Interlayer distance distribution analysis showed that the swelling of GO membranes could be controlled by separately tuning both the flake oxygen content and the membrane water content. Water-molecule cluster analysis showed that a continuous and fully connected network of water nanopores is not formed until the water content reaches ∼20%. The diffusivity of water in the membrane was also found to strongly depend on both the water and the oxygen content. These insights help understand the structure and transport properties of GO membranes with sub-nanometer interlayer distances and could be exploited to enhance the performance of GO membranes for aqueous separation applications. More broadly, the high-throughput in silico approach adopted could be applied to other nanomaterials with intrinsic non-stoichiometry and structural heterogeneity.
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45
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Zhang M, Guan K, Ji Y, Liu G, Jin W, Xu N. Controllable ion transport by surface-charged graphene oxide membrane. Nat Commun 2019; 10:1253. [PMID: 30890713 PMCID: PMC6424959 DOI: 10.1038/s41467-019-09286-8] [Citation(s) in RCA: 199] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 03/04/2019] [Indexed: 11/09/2022] Open
Abstract
Ion transport is crucial for biological systems and membrane-based technology. Atomic-thick two-dimensional materials, especially graphene oxide (GO), have emerged as ideal building blocks for developing synthetic membranes for ion transport. However, the exclusion of small ions in a pressured filtration process remains a challenge for GO membranes. Here we report manipulation of membrane surface charge to control ion transport through GO membranes. The highly charged GO membrane surface repels high-valent co-ions owing to its high interaction energy barrier while concomitantly restraining permeation of electrostatically attracted low-valent counter-ions based on balancing overall solution charge. The deliberately regulated surface-charged GO membranes demonstrate remarkable enhancement of ion rejection with intrinsically high water permeance that exceeds the performance limits of state-of-the-art nanofiltration membranes. This facile and scalable surface charge control approach opens opportunities in selective ion transport for the fields of water transport, biomimetic ion channels and biosensors, ion batteries and energy conversions.
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Affiliation(s)
- Mengchen Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China
| | - Kecheng Guan
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China
| | - Yufan Ji
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China
| | - Gongping Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China.
| | - Wanqin Jin
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China.
| | - Nanping Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Engineering, Nanjing Tech University, 5 Xinmofan Road, 210009, Nanjing, P.R. China
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46
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M R, Ayappa KG. Enhancing the Dynamics of Water Confined between Graphene Oxide Surfaces with Janus Interfaces: A Molecular Dynamics Study. J Phys Chem B 2019; 123:2978-2993. [DOI: 10.1021/acs.jpcb.8b12341] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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47
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Qiu R, Yuan S, Xiao J, Chen XD, Selomulya C, Zhang X, Woo MW. Effects of Edge Functional Groups on Water Transport in Graphene Oxide Membranes. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8483-8491. [PMID: 30698404 DOI: 10.1021/acsami.9b00492] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Graphene oxide (GO) membranes assembled by GO nanosheets exhibit high water flux because of the unique water channels formed by their functionalized layer-by-layer structure. Although water transport in the GO membrane is in principle influenced by the functional groups at the edges of GO nanosheets, this is yet to be fully understood. To fill this knowledge gap, molecular dynamics simulation was employed in this work to gain insights into the influences of three typical edge functional groups of GO nanosheets: carboxyl (COOH), hydroxyl (OH), and hydrogen (H). A well-controlled numerical analysis with complete isolation of the functional groups at the edges was undertaken. The results reveal that the COOH group has a negative impact on water transport because of its relatively large steric geometric structure, which resists water flow. By contrast, the OH group promotes water transport by uniquely "pulling" water molecules across the nanosheet layer because of its relatively stronger interaction with water. The H atom promotes water transport as well, mainly because of its low-resistance steric structure. Moreover, the size of the inter-edge hub has an apparent impact on the influence of these functional groups on water transport. The results suggest that in the design of high water flux GO membranes, it would be strategic to remove COOH edge functional groups while maintaining a mixture of OH and H edge functional groups.
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Affiliation(s)
- Ruosang Qiu
- Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Shi Yuan
- Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Jie Xiao
- China-Australia Joint Research Center in Future Dairy Manufacturing, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou , Jiangsu Province 215123 , PR China
| | - Xiao Dong Chen
- China-Australia Joint Research Center in Future Dairy Manufacturing, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou , Jiangsu Province 215123 , PR China
| | - Cordelia Selomulya
- Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Xiwang Zhang
- Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Meng Wai Woo
- Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia
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48
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Padmavathy N, Behera SS, Pathan S, Das Ghosh L, Bose S. Interlocked Graphene Oxide Provides Narrow Channels for Effective Water Desalination through Forward Osmosis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7566-7575. [PMID: 30681825 DOI: 10.1021/acsami.8b20598] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Unique two-dimensional water channels formed by stacked graphene oxide (GO) sheets that are "nonleachable" and nonswellable can show great potential for water remediation. The interlayer spacing controls the solute or ion sieving and plays a crucial role in water transport in GO-based membranes. Herein, the sub-nano-channels adjacent to the sheets are altered by either ionic or covalent cross-linking using magnesium hydroxide (Mg(OH)2) and graphene oxide quantum dots (GQDs) (named GOM and G-GQD), respectively. In aqueous solution, these cross-linkers prevent the GO sheets from swelling and precisely control the interlayer spacing required for water permeation. In addition, these narrowed GO sheets facilitate significant improvement in salt rejection of a divalent ion by forward osmosis and selective dye rejection and are resistive toward biofouling and bacterial growth. The cross-linked GO membranes are robust enough to withstand strong cross-flow velocity and aided in unimpeded water transport through the nanochannels. Among the membranes, the G-GQD membranes (G-GQD) show better antifouling characteristics, dye separation performance over 95-97% for various dyes, divalent ion rejection by 97%, and no cytotoxicity against HaCaT cells as compared with other GO membranes. Our findings on interlocking the domains of nanoslits of the GO structure by small ecofriendly molecules portray these materials as potential candidates for water separation applications.
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Affiliation(s)
- Nagarajan Padmavathy
- Department of Materials Engineering , Indian Institute of Science , Bangalore 560012 , India
| | - Shasanka Sekhar Behera
- Department of Materials Engineering , Indian Institute of Science , Bangalore 560012 , India
| | - Shabnam Pathan
- Department of Materials Engineering , Indian Institute of Science , Bangalore 560012 , India
| | - Lopamudra Das Ghosh
- Department of Materials Engineering , Indian Institute of Science , Bangalore 560012 , India
| | - Suryasarathi Bose
- Department of Materials Engineering , Indian Institute of Science , Bangalore 560012 , India
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49
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Shin Y, Taufique MFN, Devanathan R, Cutsforth EC, Lee J, Liu W, Fifield LS, Gotthold DW. Highly Selective Supported Graphene Oxide Membranes for Water-Ethanol Separation. Sci Rep 2019; 9:2251. [PMID: 30783125 PMCID: PMC6381104 DOI: 10.1038/s41598-019-38485-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 11/20/2018] [Indexed: 11/09/2022] Open
Abstract
A polyethersulfone (PES)-supported graphene oxide (GO) membrane has been developed by a simple casting approach. This stable membrane is applied for ethanol/water separation at different temperatures. The 5.0 µm thick GO film coated on PES support membrane showed a long-term stability over a testing period of one month and excellent water/ethanol selectivity at elevated temperatures. The water/ethanol selectivity is dependent on ethanol weight percentage in water/ethanol feed mixtures and on operating temperature. The water/ethanol selectivity was enhanced with an increase of ethanol weight percentage in water/ethanol mixtures, from below 100 at RT to close to 874 at a 90 °C for 90% ethanol/10% water mixture. Molecular dynamics simulation of water-ethanol mixtures in graphene bilayers, that are considered to play a key role in transport, revealed that molecular transport is negligible for layer spacing below 1 nm. The differences in the diffusion of ethanol and water in the bilayer are not consistent with the large selectivity value experimentally observed. The entry of water and ethanol into the interlayer space may be the crucial step controlling the selectivity.
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Affiliation(s)
- Yongsoon Shin
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Mohammad Fuad Nur Taufique
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Ram Devanathan
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Erika C Cutsforth
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Jaewon Lee
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Wei Liu
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Leonard S Fifield
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - David W Gotthold
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States.
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50
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Kargar M, Lohrasebi A. Water flow modeling through a graphene-based nanochannel: theory and simulation. Phys Chem Chem Phys 2019; 21:3304-3309. [PMID: 30687856 DOI: 10.1039/c8cp06839a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the behavior of water molecule transport through artificial nano-channels is essential in designing novel nanofluidic devices that could be used especially in nanofiltration processes. In this study, using nonequilibrium molecular dynamics (MD) simulations, we simulated the water flow through different graphene-based channels to investigate the influences of some key factors such as the channel thickness and applied pressure on the water flow. It was demonstrated that the water flow was enhanced by increasing the applied pressure and channel thickness. Our results indicated that a third order polynomial curve could describe the variation of the water flow as a function of the channel thickness and the applied pressure. In addition, we improved the hydrodynamics equation used to consider the water flow through nano-channels, by adding two terms to describe the slip effect and the entrance/exit effect, in which the first term increased the water flow rate, while the second term reduced it. This study may be helpful in designing high-performance graphene-based membranes with some practical applications such as desalination.
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Affiliation(s)
- Mahboubeh Kargar
- Department of Physics, University of Isfahan, Isfahan, 8174673441, Iran
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