The role of oxidation level in mass-transport properties and dehumidification performance of graphene oxide membranes

Chernova, É. A.; Петухов, Д. И.; Chumakov, Andrei; Kirianova, Alina V.; Садилов, И.С.; Kapitanova, Olesya O.; Boytsova, O. V.; Валеев, Р. Г.; Roth, Stephan V.; Елисеев, А.А.

doi:10.1016/j.carbon.2021.07.011

Cited by 34 publications

(35 citation statements)

References 67 publications

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“…Further decrease in water vapor permeability during more prolonged time could be caused by gradual deoxygenation of surface layers of the GO film. Obviously, the permeability of the aged GO film becomes close to that of the reduced GO [6]. The obtained results are complementary to the finding of Talyzin et al [9] who have studied the structural changes in GO during a prolonged period of time.…”

Section: Resultssupporting

confidence: 85%

“…Suspensions of graphene oxide nanosheets were prepared using the improved Hummers' method [12] by oxidizing medium flake graphite with graphite:KMnO4 ratio of 1:6; the detailed description of the method is presented in our previous paper [6]. The suspensions were purified from residual inorganic ions by dialysis during 30 days under constant stirring.…”

Section: Experimental Partmentioning

confidence: 99%

“…The obtained suspension of graphene oxide was denoted as MFGO (medium-flake graphene oxide). The average size of MFGO nanosheets obtained by the described procedure is 750±100 nm [6].…”

Section: Experimental Partmentioning

confidence: 99%

“…For instance, GO-based composite membranes can achieve water vapor permeance of 10-60 m 3 •m −2 •bar −1 •h −1 in the relative humidity range of a feed stream from 40 to 90% and can be used for the dehumidification of gases with moderate-to-high concentrations of water vapor [4,5]. Moreover, by adjusting oxygen-to-carbon ratio (C/O ratio), it is possible to tune the permeance-selectivity characteristics of GO-based membranes [6]. On the other hand, functional properties of GO composite membranes strongly depend on the packing architecture and ordering of GO nanoflakes, which are pre-determined by methods of GO thin films preparation including filtration, spin/spray-coating, solvent evaporation, etc [7].…”

Section: Introductionmentioning

confidence: 99%

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Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

Chernova¹,

Gurianov²,

Berekchiian³

et al. 2022

Nanosystems: Phys. Chem. Math.

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Composite membranes are formed based on ultrathin 20 nm-thick selective layers of graphene oxide nanoflakes deposited on porous anodic alumina substrates. The long-term dynamics of permanent gases transport and water vapor permeability across the composite membranes is measured during 240 days (8 months). It is revealed that the permeability towards permanent gases remains nearly constant during a prolonged period of time. Contrary, water vapor flux decreases rapidly within the first 30 days from the membrane preparation moment and reaches about 80% of permeability loss during 8 months. The rapid decrease of membrane permeability during the first month could be attributed to a gradual packing of graphene oxide nanoflakes, particularly, locating in the surface sublayers, into more tight microstructure due to the evaporation of remaining solvent (membrane drying) under ambient conditions. Further decrease in permeability during more prolonged time could be caused additionally by deoxygenation of surface GO nanoflakes preventing water vapors diffusion into the GO film. This phenomenon, the so called "ageing" accompanies graphene oxide thin films similarly to some types of highly-permeable polymers. Holding the aged membrane under saturated water vapors, and even liquid water, didn't allow one to revitalize completely its permeability. The obtained results should be taken into account when designing membranes and other devices based on graphene oxide and its derivatives. KEYWORDS graphene oxide nanoflakes, anodic alumina, membrane ageing, dehumidification, water vapor transport. ACKNOWLEDGEMENTS The work is supported by the Russian Science Foundation (project 22-23-00662 "Membranes for molecular filtration and membrane electrocatalysis based on reduced graphene oxide").

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Section: Resultssupporting

confidence: 85%

Section: Experimental Partmentioning

confidence: 99%

“…The obtained suspension of graphene oxide was denoted as MFGO (medium-flake graphene oxide). The average size of MFGO nanosheets obtained by the described procedure is 750±100 nm [6].…”

Section: Experimental Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

Chernova¹,

Gurianov²,

Berekchiian³

et al. 2022

Nanosystems: Phys. Chem. Math.

Self Cite

View full text Add to dashboard Cite

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“…With predefined platelet-shape anisotropy, the nanoparticles will tend to align on the flat surface, more likely providing a homogeneous coating with the flat orientation of nanoplatelets. Such a nanocoating is readily formed on liquid–solid interfaces with spray- , or spin-casting , techniques or can be transferred to a solid substrate from a liquid–air interface using the Langmuir–Blodgett approach . From a theoretical point of view, forming a thin monolayer of highly anisotropic particles with ultimate magnetocrystalline anisotropy is of major importance.…”

Section: Introductionmentioning

confidence: 99%

Sprayed Nanometer-Thick Hard-Magnetic Coatings with Strong Perpendicular Anisotropy for Data Storage Applications

Chumakov

Brett

Gordeyeva

et al. 2022

ACS Appl. Nano Mater.

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The rapid growth of digital information in the world necessitates a big leap in improving the existing technologies for magnetic recording. For the best modern perpendicular recording, the highest coercivity materials with minimal volume are required. We present a study of a facile technology for establishing mono- and multilayer surfaces from various single-domain flat magnetic nanoparticles that exhibit a strong perpendicular-oriented magnetic moment on solid and flexible substrates. Surfactant-free, hard ferromagnetic, and single-domain anisotropic strontium hexaferrite SrFe12O19 nanoparticles with a perpendicular magnetic moment orientation and two different aspect ratios are self-ordered into magnetic thin nanofilms, exploiting the templating effect of cellulose nanofibrils and magnetic fields. Uniform magnetic coatings obtained by the scalable layer-by-layer spray deposition from a monolayer coverage up to thicknesses of a few tens of nanometers show a preferred in-plane orientation of the hard-magnetic nanoparticles. High coercivities of the films of up to 5 kOe and a high perpendicular anisotropy of M r⊥/M s > 80% are found. The application of the magnetic field during film deposition ensures additional improvement in perpendicular magnetic anisotropy and the appearance of residual magnetization in the film of up to 0.6M s. For low-aspect-ratio nanoparticles stacked in periodic planar structures, the signs of the photonic band gap are revealed. The ability to create scalable, thin magnetic structures based on nanosized particles/building blocks opens great opportunities for their application in a wide variety of optoelectronic and magnetic storage devices.

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Cellulose‐Reinforced Programmable and Stretch‐Healable Actuators for Smart Packaging

Chen

Sochor

Chumakov

et al. 2022

Adv Funct Materials

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Biomimetic actuators are promising candidates for smart soft robotics. The applications of state‐of‐the‐art actuators require the combination of programmable stimuli‐responsiveness, excellent robustness, and efficient self‐healing ability in a wide‐range of working conditions. However, these properties may be mutually exclusive. Inspired by biological tissues, two kinds of polyelectrolytes including polyvinyl alcohol (PVA) and polystyrene sulfonate (PSS) are exploited as the fillers of cellulose nanofibrils (CNFs) for the fabrication of the CNF/PVA/PSS (CAS) film via the assembly of the physically‐crosslinked network through multiple H‐bonding and electrostatic interactions. Achieved by a casting‐evaporation strategy, internal stress is stored within the polymer matrix and transforms into reversible anisotropic bending deformations in response to a humidity gradient. The speed, direction, and pitch of the bending can be programmed by tailoring the internal stresses and geometry of the samples. Moreover, the H‐bonded network also contributes to the effective energy dissipation toward high toughness during tensile stretching, as well as self‐healing ability during moisture saturation of the CAS films. This enables the fabrication of a humidity‐sensitive flower‐shaped actuator and self‐healable packaging paper. This study presents a biomimetic strategy for the fabrication of multi‐functional soft robotics, which holds great promise for applications in the fields of biosensors and smart packaging.

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The role of oxidation level in mass-transport properties and dehumidification performance of graphene oxide membranes

Cited by 34 publications

References 67 publications

Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

Sprayed Nanometer-Thick Hard-Magnetic Coatings with Strong Perpendicular Anisotropy for Data Storage Applications

Cellulose‐Reinforced Programmable and Stretch‐Healable Actuators for Smart Packaging

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