Solvent-driven responsive bilayer membranes of clay and graphene oxide

Gogoi, Raj Kumar; Saha, Kundan; Deka, Jumi; Brahma, Dulu; Raidongia, Kalyan

doi:10.1039/c6ta09341h

Cited by 40 publications

(31 citation statements)

References 36 publications

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“…Depending on specific applications, the thickness of the coatings can be controlled from the order of nanometers to micrometers . Vacuum filtration is versatile and thus a better choice to fabricate macroscopic multilayered membranes with asymmetric structures . 3D printing shows the potential to create a wide range of multifunctional materials with almost any geometrical shape or unique features …”

Section: Design and Fabricationmentioning

confidence: 99%

Strategic Design of Clay‐Based Multifunctional Materials: From Natural Minerals to Nanostructured Membranes

Zhou

LaChance

Smith

et al. 2019

Adv Funct Materials

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Nature not only carefully prepares ingenious raw materials but also continuously inspires and guides human beings to create a wide variety of intelligent materials. As the most abundant mineral resource on earth, clay minerals are no longer synonymous with ceramics and cements. Many natural clay minerals can be exfoliated into single-or few-layered nanosheets with exquisite physicochemical properties, which can be reassembled into functional membranes with a macroscopic controllable size and microscopic ordered structure. They are thus used in many fields including chemistry, biology, energy, and environmental science. Strategic design represents one of the key processes to enhance the value of clay minerals and broaden their applications. In this work, the three frequently used approaches of exfoliation are highlighted and the six routes of assembly including casting, dip-coating, spray coating, vacuum filtration, electrophoretic deposition, and 3D printing are compared. The corresponding principles and advantages are summarized. Representative applications of clay-based multifunctional membranes in protection, separation, responsiveness, flexible electronics, and energy conversion are presented. The challenges and future perspectives of the claybased multifunctional membranes are discussed.

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Section: Design and Fabricationmentioning

confidence: 99%

Strategic Design of Clay‐Based Multifunctional Materials: From Natural Minerals to Nanostructured Membranes

Zhou

LaChance

Smith

et al. 2019

Adv Funct Materials

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“…For instance, self‐locomotive hygroscopically responsive structures have been realized with aligned polyethylene oxide nanofibers electrospun on a silicon‐based adhesive/polyimide layer . Bilayer membranes prepared by sequential filtration of clay and graphene oxide (GO) dispersions have shown high and fast responsiveness to humidity and their bending has also been found triggered by vapors of alcohols, tetrahydrofuran, ethyl acetate, dichloromethane, and acetone . Microbial‐based multilayer structures constituted by a biohybrid film obtained by Escherichia coli cells deposited on natural latex sheets have also shown humidity‐triggered bending capability .…”

Section: Introductionmentioning

confidence: 99%

Humidity‐Driven Mechanical and Electrical Response of Graphene/Cloisite Hybrid Films

Castaldo

Lama

Aprea

et al. 2018

Adv Funct Materials

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Humidity-driven and electrically responsive graphene/cloisite hybrid films are obtained by casting water dispersions of graphene oxide and cloisite Na + . Coupling hydrophilicity and a high water vapor barrier in a homogenous film enables to realize humidity-driven actuators which exploit the water gradient generated across the film section under asymmetric exposure to humidity. The hybrid films are self-standing, flexible, and exhibit fast humidity-triggered bidirectional bending up to 75°, which is tuned by varying the relative amount of the two components. Up to 60% of the bending angle can be preserved at the steady state, providing a large and reliable response to humidity. Moreover, thermal treatment results in the reduction of graphene oxide, endowing the films with humidity-dependent electrical conductivity, which increases from 1.5 × 10 −6 S at 20% relative humidity (RH) up to 2.7 × 10 −5 S at 90% RH. The films are used to realize a humiditysensitive electrical switching system in which the reversible actuation is due to water desorption induced by the Joule effect. Due to their ease of preparation and tunable properties, this new class of graphene-based materials is suitable for the realization of humidity-driven and electrically responsive actuators and sensors. development of new humidity-driven mechanically and electrically responsive actuators and sensors.

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“…Nature produces a plethora of such materials in order to accomplish various biological tasks, and offer persistent inspirations to design and manufacture artificial smart materials. Intelligence has been witnessed, as well as induced, in a diverse range of materials including alloys, ceramics, polymers, gels, polymer nanocomposites, and bulk nanostructured materials . Various stimuli such as heat, light, voltage, humidity, or pH have been used to trigger alteration of the physical properties of the materials, including size, shape, color, and conductivity .…”

mentioning

confidence: 99%

“…Various stimuli such as heat, light, voltage, humidity, or pH have been used to trigger alteration of the physical properties of the materials, including size, shape, color, and conductivity . Physical intelligence has been attained by implementing various physical and chemical processes such as (i) regeneration of shape memory phases, (ii) transformations of inhomogeneous materials, (iii) unequal response of bilayer membranes, and (iv) exposure to gradient stimuli fields . In addition to their fundamental significance, artificial smart materials may also engender a diverse range of impending applications, like drug delivery, tissue engineering, “smart” optical systems, sensors, actuators, and robotics.…”

mentioning

confidence: 99%

“…Studies on vapor prompted alteration of the bending stiffness of the individual components of the CCBM support the balance shifting mechanism for shape transformations. Here, Lorentzen & Wettre two‐point method was used to determine bending stiffness ( S b ), of the isolated strips under exposure to different atmospheres, as discussed in Figure S14 (Supporting Information). In the air atmosphere, the stiffness of vermiculite and montmorillonite strips were calculated as 2.27 × 10 −6 and 7.12 × 10 −6 N m, respectively.…”

mentioning

confidence: 99%

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Strategic Shuffling of Clay Layers to Imbue Them with Responsiveness

Gogoi

Raidongia

2017

Advanced Materials

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Layers of naturally occurring clay minerals are rearranged to prepare highly sensitive multiresponsive clay-clay bilayer membrane (CCBM). The CCBM introduced here responds to the minuscule changes in the surrounding environments including temperature, humidity, and presence of solvent vapors by morphing in specific manners. Strips cut from CCBM exhibit up to 588 N kg force output when exposed to temperature fluctuations. Inheriting the natural stability of clay minerals, CCBM demonstrates extreme robustness, heating up to 500 °C, cooling with liquid N and exposure to corrosive chemical vapors did not deteriorate its bending performance. Mechanistic studies suggest that shape transformations of CCBM are driven by the unequal response of its components to external stimuli.

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Solvent-driven responsive bilayer membranes of clay and graphene oxide

Abstract: Bilayer membranes that can morph in a controlled manner were prepared by restacking exfoliated layers of clay and graphene oxide (GO) from their respective aqueous dispersions.

Cited by 40 publications

References 36 publications

Strategic Design of Clay‐Based Multifunctional Materials: From Natural Minerals to Nanostructured Membranes

Strategic Design of Clay‐Based Multifunctional Materials: From Natural Minerals to Nanostructured Membranes

Humidity‐Driven Mechanical and Electrical Response of Graphene/Cloisite Hybrid Films

Strategic Shuffling of Clay Layers to Imbue Them with Responsiveness

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