Graphene oxide-Laponite hybrid from highly stable aqueous dispersion

Chouhan, Devesh Kumar; Patro, T. Umasankar; Harikrishnan, G.; Kumar, Sanjay; Gupta, Siddharth; Kumar, G. Sudheer; Cohen, Hagai; Wagner, H. Daniel

doi:10.1016/j.clay.2016.05.023

Cited by 20 publications

(18 citation statements)

References 60 publications

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“…So, GO gives rise in an easy way to clay-composite dispersions of good stability but requiring elevated clay/GO (w/w) ratio (>10). [ 25 ] Moreover, these systems, even after reduction of GO species, lead to solids provided of lower conductivity than the corresponding materials based on GNP due to the strong effect of the applied reducing procedure. [ 26 ] Clays of different morphology, such as halloysite nanotubular clays, have been also assembled to graphene-like compounds to produce hybrid systems as reported by Liu et al [ 27 ] In view to the incompatibility between both negatively charged 2D particles (halloysite and graphene oxide, GO), these last authors introduced a selective modifi cation of the outmost clay surface by grafting of γ-aminopropyltriethoxy groups that, under acidic conditions, transforms halloysite into a positively charged surface allowing its combination with GO in an electrostatic way.…”

Section: Figurementioning

confidence: 99%

Clay‐Graphene Nanoplatelets Functional Conducting Composites

Ruiz‐Hitzky

Sobral

Gómez-Avilés

et al. 2016

Adv Funct Materials

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An approach to functionalize graphene-based materials has been developed by assembling graphene nanoplatelets (GNP) with clay minerals. Under convenient sonomechanical treatment, clay-GNP mixtures may produce very stable water dispersions in particular using sepiolite fi brous clay. While in the absence of clay a rapid decantation of GNP in water is observed, in the presence of sepiolite the resulting dispersions remain stable during months without syneresis effects. Rigid but fl exible self-supported fi lms are easily obtained by fi ltering of these dispersions. As the electrical percolation threshold corresponds to sepiolite/GNP composites of 0.5:1 in weight, doping these systems with multiwalled carbon nanotubes (MWCNTs) significantly enhances their electrical conductivity. The particular microporosity of the sepiolite component allows interactions with molecules, such as organic dyes, as well as polymers, such as biopolymers, opening the way to functional materials for advanced applications due to their inherent conductivity afforded by the GNP and MWCNTs carbonaceous components. In fact, using very small amount of MWCNT together with GNP can obtain composites with signifi cant electrical conductivity, maintaining the enhanced mechanical properties, at a lower cost.

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Section: Figurementioning

confidence: 99%

Clay‐Graphene Nanoplatelets Functional Conducting Composites

Ruiz‐Hitzky

Sobral

Gómez-Avilés

et al. 2016

Adv Funct Materials

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“…The surface modification of graphene is the most popular approach for adding the aforementioned bonds and exfoliating graphene in water [ 46 ]. Chemical oxidation is commonly used to form the necessary covalent bonds to produce graphene oxide, which is readily dispersible in water in strongly alkaline conditions [ 47 , 48 ]. However, the carboxylic groups of the graphene oxide produce an acidic pH, which results in restacking and the precipitation of the graphene interlayers.…”

Section: Resultsmentioning

confidence: 99%

“…However, as the concentration of the incorporated graphene oxide increases, so does the pore size. This phenomenon may be attributed to the self-organization and the electrostatic interaction between the positively charged Laponite and the negatively surface charged graphene oxide layers [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Silicate-Based Electro-Conductive Inks for Printing Soft Electronics and Tissue Engineering

Gharaie

Seyfoori

Jush

et al. 2021

Gels

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Hydrogel-based bio-inks have been extensively used for developing three-dimensional (3D) printed biomaterials for biomedical applications. However, poor mechanical performance and the inability to conduct electricity limit their application as wearable sensors. In this work, we formulate a novel, 3D printable electro-conductive hydrogel consisting of silicate nanosheets (Laponite), graphene oxide, and alginate. The result generated a stretchable, soft, but durable electro-conductive material suitable for utilization as a novel electro-conductive bio-ink for the extrusion printing of different biomedical platforms, including flexible electronics, tissue engineering, and drug delivery. A series of tensile tests were performed on the material, indicating excellent stability under significant stretching and bending without any conductive or mechanical failures. Rheological characterization revealed that the addition of Laponite enhanced the hydrogel’s mechanical properties, including stiffness, shear-thinning, and stretchability. We also illustrate the reproducibility and flexibility of our fabrication process by extrusion printing various patterns with different fiber diameters. Developing an electro-conductive bio-ink with favorable mechanical and electrical properties offers a new platform for advanced tissue engineering.

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“…In this way, mixtures of exfoliated GO in ethanol and water suspensions of Laponite, a synthetic magnesium silicate clay, treated under ultrasounds, produced materials in which the presence of the clay stabilized the colloidal suspension, allowing the treatment with reducing agents and the incorporation of other additives, and preventing as well the self‐stacking of rGO nanosheets in the dried products ( Figure ) . Actually, Laponite is easily exfoliated in water and stabilizes GO suspensions due to improved electrostatic interaction of the interlayer cations of the clay with the functional groups in the GO, preventing flocculation for several months . In fact, this interaction favors certain degree of exfoliation of the GO and may promote its partial reduction.…”

Section: Direct Assembling Of Carbon and Clay Materialsmentioning

confidence: 99%

The Meeting Point of Carbonaceous Materials and Clays: Toward a New Generation of Functional Composites

Darder

Aranda

Ruiz-García

et al. 2017

Adv Funct Materials

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Carbon and clays are worldwide-spread natural resources known and used for centuries by humans. In spite of their differences, both have been combined to produce diverse types of functional materials, from conventional pencil cores to advanced hybrid composites. The presence of highly conductive graphene and/or carbon nanotubes allows for their use in applications ranging from elements of electrochemical devices to additives for polymer nanocomposites, pollution adsorbents, or active catalysts. Both top-down and bottom-up strategies can be applied to conveniently assemble carbon and clay counterparts. Moreover, such synthetic strategies can be tailored to produce adequate nanostructured materials and/or associate other species. This critical review presents the latest advances on this topic, addressing aspects related to the possibility to produce hybrid materials based on their functionalization capacity.

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Graphene oxide-Laponite hybrid from highly stable aqueous dispersion

Cited by 20 publications

References 60 publications

Clay‐Graphene Nanoplatelets Functional Conducting Composites

Clay‐Graphene Nanoplatelets Functional Conducting Composites

Silicate-Based Electro-Conductive Inks for Printing Soft Electronics and Tissue Engineering

The Meeting Point of Carbonaceous Materials and Clays: Toward a New Generation of Functional Composites

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