Graphene-encapsulated aluminium oxide nanofibers as a novel type of nanofillers for electroconductive ceramics

Ivanov, Roman; Hussainova, Irina; Aghayan, Marina; Drozdova, Maria; Pérez-Coll, Domingo; Rodríguez, Miguel Á.; Rubio-Marcos, Fernando

doi:10.1016/j.jeurceramsoc.2015.06.011

Cited by 48 publications

(31 citation statements)

References 17 publications

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“…It was demonstrated that the resulting material had an outstanding electrochemical stability and could serve as an excellent electrocatalyst support for Pt particles in fuel cells. A novel type of electroconductive ceramics was proposed by homogeneous dispersion of graphenated alumina nanofibers within alumina matrix. The developed approach utilized the advantages of reinforcement by fibers and high conductivity of graphene.…”

Section: Introductionmentioning

confidence: 99%

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

et al. 2017

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The authors propose a novel type of ion-selective membranes, which combine the advantages of ceramic nanofibrous media with good electrical conductivity. The membranes are produced from Nafen alumina nanofibers (diameter around 10 nm) by filtration of nanofiber suspension through a porous support followed by drying and sintering. Electrical conductivity is achieved by depositing a thin carbon layer on the nanofibers by chemical vapor deposition (CVD). Raman and FTIR spectroscopy, X-ray fluorescence analysis, and TEM are used to confirm the carbon structure formation. The deposition of carbon leads to decreasing porosity (from 75 to 62%) and specific surface area (from 146 to 107 m 2 g À1 ) of membranes, while the pore size distribution maximum shifts from 28 to 16 nm. Measurements of membrane potential in an electrochemical cell show that the carbon coated membranes acquire high ionic selectivity (transference numbers 0.94 for anion and 0.06 for cation in aqueous KCl). Fitting the membrane potential data by the Teorell-Meyer-Sievers model shows that the fixed membrane charge increases proportionally with increasing electrolyte concentration. The carbon coated membranes are ideally polarizable for applied voltages from À0.5 to þ0.8 V. The potential applications of produced membranes include nano-and ultrafiltration, separation of charged species, and switchable ion-transport selectivity.

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Section: Introductionmentioning

confidence: 99%

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

et al. 2017

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“…The graphene demonstrates its ability upon conventional ceramics, which not only enhances the thermal transfer and management abilities, but also reinforces its electrical and mechanical properties. Ceramic, as the most extensively used construction and decoration material, has huge potentials in specific applications, such as smart walls.…”

Section: Graphene Saltmentioning

confidence: 92%

Graphene: An Outstanding Multifunctional Coating for Conventional Materials

Tan

Wang

Zeng

et al. 2017

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As the most significant facilitator of human civilization, materials are eternal jewels in the view of researchers whose brilliance never faded. However, simple conventional materials, which are most commonly used and indispensable today, seem too primitive and insufficiently functional to meet the demands of the future intelligent and informational applications, urging more functions to be integrated. The ideal strategy to achieve the transformations of conventional materials non-destructively is functionalizing the surface and retaining the original properties at the same time. Graphene, a two-dimensional material with only atomic-thickness, has come into the view of the researchers, attributed to its various outstanding properties. In recent years, a large amount of research has been devoted to "wearing" graphene to functionalize the conventional materials, booming a huge "graphene-X" family. In this concept, representative members are illustrated and their improved functions are demonstrated. Also, the prospects and challenges for this dazzling family are discussed.

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“…Recently, we have demonstrated novel, grapheneaugmented inorganic nanofibre (GAIN) scaffolds capable of mimicking ECM providing highly anisotropic environment combined with oriented porosity [29][30][31], guiding cells to line up along the longitudinal axis of the fibres with a spindle-like shape and more than usually elongated cytoplasmic lamellipodia extensions. These GAIN scaffolds do not impede the normal growth of MSCs, whose oriented morphology indicates cell polarization for the preference of a specific differentiation [29].…”

Section: Background: the Challenge Of Stem Cell Environment Controlmentioning

confidence: 99%

“…The unique self-assembled metal oxide fibre network with an average single fibre diameter of approximately 40 nm and length of 2-10 cm with 85 -95% oriented porosity was produced using a bottom-up approach of controlled liquidphase oxidation [30,31]. These substrates were used for graphene shell growth in a single-step process of novel catalyst-free chemical vapour deposition (CVD) at 10008C at ambient pressure in a mixture of N 2 þ CH 4 gases (figure 1) [29,30]. In contrast to many other studies, graphene on the nanofibres (estimated thickness of order of approximately 1 nm, figure 1) was not functionalized in any way and became augmented to the underlying oxide fibre surface during the manufacturing process.…”

Section: Augmenting Graphene On Aligned Ceramic Nanofibresmentioning

confidence: 99%

Hybrid graphene–ceramic nanofibre network for spontaneous neural differentiation of stem cells

Kazantseva¹,

Hussainova

Ivanov

et al. 2018

Interface Focus.

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A challenge in regenerative medicine is governed by the need to have control over the fate of stem cells that is regulated by the physical and chemical microenvironment and. The differentiation of the stem cells into specific lineages is commonly guided by use of specific culture media. For the first time, we demonstrate that human mesenchymal stem cells are capable of turning spontaneously towards neurogenic lineage when seeded on graphene-augmented, highly anisotropic ceramic nanofibres without special differentiation media, contrary to commonly thought requirement of 'soft' substrates for the same purpose. Furthermore, pro-inflammatory gene expression is simultaneously suppressed, and expression of factors promoting focal adhesion and monocytes taxis is upregulated. This opens new possibilities of using local topo-mechanical cues of the 'graphenized' scaffold surfaces to guide stem cell proliferation and differentiation, which can be used in studies of neurological diseases and cell therapy.

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Graphene-encapsulated aluminium oxide nanofibers as a novel type of nanofillers for electroconductive ceramics

Cited by 48 publications

References 17 publications

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

Graphene: An Outstanding Multifunctional Coating for Conventional Materials

Hybrid graphene–ceramic nanofibre network for spontaneous neural differentiation of stem cells

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