Hollow nanoparticle nanotubes with a nanoscale brick wall structure of clay mineral platelets

Ras, Robin H. A.; Ruotsalainen, Teemu; Laurikainen, Katri; Ikkala, Olli

doi:10.1039/b616548f

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…295 Long hollow inorganic nanoparticle nanotubes with a nanoscale brick wall structure of clay mineral platelets have been synthesized by templating of block copolymer electrospun fibers with clay mineral platelets followed by interlinking of the platelets using condensation reactions. 296 Similarly, the construction of hollow inorganic nanospheres and nanotubes (inorganic nanostructures) with tunable wall thicknesses (with hollow interiors) is demonstrated by coating on self-assembled polymeric templates (nano-objects) with a thin Al 2 O 3 layer by ALD, followed by removal of the polymer template upon heating. 297 The morphology of the nano-object (i.e., spherical or cylindrical) is controlled by the block lengths of the copolymer.…”

Section: Inorganic Nanotubesmentioning

confidence: 99%

Synthesis of inorganic nanomaterials

et al. 2007

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Synthesis forms a vital aspect of the science of nanomaterials. In this context, chemical methods have proved to be more effective and versatile than physical methods and have therefore, been employed widely to synthesize a variety of nanomaterials, including zero-dimensional nanocrystals, one-dimensional nanowires and nanotubes as well as two-dimensional nanofilms and nanowalls. Chemical synthesis of inorganic nanomaterials has been pursued vigorously in the last few years and in this article we provide a perspective on the present status of the subject. The article includes a discussion of nanocrystals and nanowires of metals, oxides, chalcogenides and pnictides. In addition, inorganic nanotubes and nanowalls have been reviewed. Some aspects of core-shell particles, oriented attachment and the use of liquid-liquid interfaces are also presented.

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Section: Inorganic Nanotubesmentioning

confidence: 99%

Synthesis of inorganic nanomaterials

et al. 2007

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“…2 Inorganic nanotubes have been pursued in optoelectronics, sensors, drug release, and fluid manipulation. 3 During recent years, many routes toward hollow inorganic nano-objects have been demonstrated, including templating on nanoporous membranes or nanofibers, for example, coating anodic alumina membranes by various methods, 4-8 directly anodizing titanium dioxide films, 9 coating electrospun fibers, 10,11 and coating block copolymer templates with inorganics. 12 In this context, also aerogels could be particularly useful as facile highly porous network-like solid templates for inorganic nanotubes.Highly porous solid materials, called aerogels, were first discovered in the 1930s, 13 and although silica aerogels were commercially produced already in the 1940s, 14 it was not until late 20th century when a more broad range of applications was introduced.…”

mentioning

confidence: 99%

Inorganic Hollow Nanotube Aerogels by Atomic Layer Deposition onto Native Nanocellulose Templates

et al. 2011

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Hollow nano-objects have raised interest in applications such as sensing, encapsulation, and drug-release. Here we report on a new class of porous materials, namely inorganic nanotube aerogels that, unlike other aerogels, have a framework consisting of inorganic hollow nanotubes. First we show a preparation method for titanium dioxide, zinc oxide, and aluminum oxide nanotube aerogels based on atomic layer deposition (ALD) on biological nanofibrillar aerogel templates, that is, nanofibrillated cellulose (NFC), also called microfibrillated cellulose (MFC) or nanocellulose. The aerogel templates are prepared from nanocellulose hydrogels either by freeze-drying in liquid nitrogen or liquid propane or by supercritical drying, and they consist of a highly porous percolating network of cellulose nanofibrils. They can be prepared as films on substrates or as freestanding objects. We show that, in contrast to freeze-drying, supercritical drying produces nanocellulose aerogels without major interfibrillar aggregation even in thick films. Uniform oxide layers are readily deposited by ALD onto the fibrils leading to organic-inorganic core-shell nanofibers. We further demonstrate that calcination at 450 °C removes the organic core leading to purely inorganic self-supporting aerogels consisting of hollow nanotubular networks. They can also be dispersed by grinding, for example, in ethanol to create a slurry of inorganic hollow nanotubes, which in turn can be deposited to form a porous film. Finally we demonstrate the use of a titanium dioxide nanotube network as a resistive humidity sensor with a fast response.

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“…[1][2][3][4][5] In addition to such possibilities, the excellent biocompatibility, biodegradability, and facile surface modification of silica-based HMMs make them particularly suitable for drug release control and targeted delivery as well as simultaneous diagnosis and therapy of cancers. 10 Electrospinning is a simple and efficient process to produce nanofibers, 21,[24][25][26][27][28] which can be used directly or acted as templates for creating new functional nanoproducts or manipulating molecular self-assembly. In general, there are two main synthetic routes to produce HMMs, soft-and hard-templating.…”

Section: Introductionmentioning

confidence: 99%

Controlled‐release drug carriers based hierarchical silica microtubes templated from cellulose acetate nanofibers

Jia

Song

Jin

et al. 2015

J of Applied Polymer Sci

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We report a facile method to synthesize hollow silica microtubes (SMTs) from electrospun cellulose acetate fiber precursors. Specific surface areas of up to 765 m 2 /g (Brunauer-Emmett-Teller) were measured for the SMTs, which had a typical wall thickness of 100 nm and submicron inner diameters. An average pore size of 4.6 nm and pore volume of 0.41 cm 3 /g were derived from Barrett-Joyner-Halenda fitting, whereas Horvath-Kawazoe pore size distribution analysis revealed microporous median pore size and maximum pore volume of 0.7 nm and 0.18 cm 3 /g, respectively. The as-prepared SMTs featuring micro-and mesoporous structures in the walls where amino-functionalized to facilitate a very high drug loading (15% by weight). Drug release profile revealed sustained release rates (79% of acetylsalicylic acid was released after 6 h). It is concluded that the high drug loading and sustained release resulted from the advantageous integration of SMTs' hollow structure and wall mesoporosity. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42562.

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Hollow nanoparticle nanotubes with a nanoscale brick wall structure of clay mineral platelets

Abstract: Long hollow inorganic nanoparticle nanotubes have been synthesized by templating of block copolymer electrospun fibers with clay mineral platelets followed by interlinking of the platelets using condensation reactions.

Cited by 17 publications

References 16 publications

Synthesis of inorganic nanomaterials

Synthesis of inorganic nanomaterials

Inorganic Hollow Nanotube Aerogels by Atomic Layer Deposition onto Native Nanocellulose Templates

Controlled‐release drug carriers based hierarchical silica microtubes templated from cellulose acetate nanofibers

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