New and modified anodic alumina membranes Part I. Thermotreatment of anodic alumina membranes

Mardilovich, Peter; Govyadinov, Alexander N.; Мухуров, Н. И.; Rzhevskii, Alexander; Paterson, Russell

doi:10.1016/0376-7388(94)00184-z

Cited by 151 publications

(110 citation statements)

References 26 publications

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“…On the other hand, it suffers from poor chemical stability, especially both in acid and alkaline solutions. 24 Moreover, it is well-known that the open ends of the nanochannels are gradually sealed in neutral hot water due to hydration of the initially formed aluminum oxide.…”

Section: Synthesis Of Various Types Of Carbon Nanotubesmentioning

confidence: 99%

Synthesis of Various Types of Nano Carbons Using the Template Technique

Kyotani¹

2006

Bulletin of the Chemical Society of Japan

101

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Using uniform nanochannels of an aluminum anodic oxide film as a template, uniform and unique multiwalled carbon nanotubes can be synthesized with a selectivity of 100%. This technique allows one to precisely control the diameters and the length of nanotubes. Moreover, it is possible to chemically modify only the inner surface of carbon nanotubes and to prepare carbon nanotubes with a double coaxial structure of heteroatom-doped multiwalls. The test tube like carbon prepared by this technique was found to be dispersible in water without any post treatment. In addition to this one-dimensional approach, unique microporous carbon can be prepared by the template technique using zeolite Y. The resulting microporous carbons are characterized by their regular ordering, originating from the regularity of the parent zeolite. When the synthesis conditions were optimized, the specific surface area and the micropore volume of the zeolitetemplated carbon reach more than 4000 m 2 g À1 and 1.8 cm 3 g À1 , respectively. This review introduces such a templatemediated approach and highlights how useful and versatile the template technique is for the production of nano carbons.Carbon is an element with a unique ability to bond with itself principally via sp 3 (diamond-like) and sp 2 (graphite-like) hybridization. This versatility gives rise to a rich diversity of structural forms of solid carbon. Most of the materials dealt with in carbon science and industry are considered to be composed of mainly large polycyclic aromatic molecules. The differences in the shape of such macromolecules and the way the molecules assemble (how they stack and how they are connected to one another) again lead to an immense variety of possibilities. If one could control the shape of the macromolecules and the state of their assemblage at the nanometer level, it would be possible to prepare carbon materials with a unique nano structure, thereby expecting novel and useful characteristics from the structure. Such control is, however, a very difficult task, because the nano structure of carbon materials is not uniform by nature, except for perfect graphite and diamond. To illustrate, a drawing of the molecular structure of activated carbon is shown in Fig. 1, where many curved polycyclic aromatic molecules with different sizes and shapes are stacked and connected in very complicated ways, which is quite different from the uniform ordered porous structure of zeolite materials. It is easily understood from this molecular model that control of the shape and the position of each macromolecule in the model is very difficult and essentially impossible. For the ultimate control of the carbon nano structure, it is desirable to build up a carbon structure from small building blocks, i.e., synthesize the structure from small organic molecules using techniques developed in the field of organic synthesis. However, the organic syntheses of fullerenes and carbon nanotubes have not been achieved yet, even by using cutting-edge technology. One of the most powerful and pro...

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Section: Synthesis Of Various Types Of Carbon Nanotubesmentioning

confidence: 99%

Synthesis of Various Types of Nano Carbons Using the Template Technique

Kyotani¹

2006

Bulletin of the Chemical Society of Japan

101

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“…The principal research tools used to characterise the materials are SEM, XRD, Thermal analysis (DTA/DSC/TGA), Evolved Gas Analysis by Mass Spectrometry and Solid State Nuclear Magnetic Resonance (NMR). XRD and thermal analysis techniques have been used to characterise crystalline phase transitions in PAA prepared in phosphoric acid (Wang et al, 2004), oxalic acid (Mardilovich et al, 1995) and sulphuric acid (Ozao et al, 2001) at temperatures up to 600 °C, 1200 °C, and 1250 °C respectively. Irrespective of the acid electrolyte used during their preparation, the as-formed PAA membranes are X-ray amorphous.…”

Section: Thermal and Structural Transformations Of Porous Anodic Aluminamentioning

confidence: 99%

Fabrication, Structure and Properties of Nanostructured Ceramic Membranes

Brown¹,

Wu²,

Smith³

2012

Ceramic Materials - Progress in Modern Ceramics

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“…Secondary pores with an average diameter of around 4 nm will be created in the walls of the initial pores. 13 At temperatures above 600°C a morphology change is observed in the FePt due to structural evolution of the template. This is demonstrated in Fig.…”

Section: Structural Characterizationmentioning

confidence: 99%

Magnetic nanotubes produced by hydrogen reduction

Sui

Skomski

Sorge

et al. 2004

Journal of Applied Physics

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FePt and Fe 3 O 4 nanotubes are produced by hydrogen reduction in nanochannels of porous alumina templates and investigated by electron microscopy, x-ray diffraction, and superconducting quantum interference device magnetometry. Loading the templates with an Fe chloride and Pt chloride mixture, followed by hydrogen reduction at 560°C, leads to the formation of ferromagnetic FePt nanotubes in the alumina pores. An Fe nitrate solution, thermally decomposed at 250°C and reduced in hydrogen for 2.5 h at the same temperature, yields Fe 3 O 4 tubes. The versatility of the method indicates that materials with a wide range of parameters can be produced.

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New and modified anodic alumina membranes Part I. Thermotreatment of anodic alumina membranes

Cited by 151 publications

References 26 publications

Synthesis of Various Types of Nano Carbons Using the Template Technique

Synthesis of Various Types of Nano Carbons Using the Template Technique

Fabrication, Structure and Properties of Nanostructured Ceramic Membranes

Magnetic nanotubes produced by hydrogen reduction

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