Freestanding, Highly Flexible, Large Area, Nanoporous Alumina Membranes with Complete Through‐Hole Pore Morphology

Schneider, Jörg J.; Engstler, Jörg; Budna, K. P.; Teichert, Christian; Franzka, Steffen

doi:10.1002/ejic.200401046

Cited by 68 publications

(59 citation statements)

References 24 publications

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“…The amount of oxalate anion impurities is reduced due to the predominant dissolution of the electrolyte-rich inner area of the individual PAOX cells. [26] The following reaction takes place between dichromate and oxalate anions in the acid medium: Figure 2. TG traces of: (1) unetched PAOX membranes (oxalic acid); (2) the same PAOX membranes after the barrier layer removal in the etching mixture.…”

Section: Ceramic Nanowires Derived From 40 V Paox Templatesmentioning

confidence: 99%

Polymer‐Derived SiOC Nanotubes and Nanorods via a Template Approach

et al. 2009

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The synthesis of silicon‐based ceramic nanowires and nanotubes produced by liquid infiltration of commercially available silicon‐based polymers, namely polysilazane (CerasetTM, polyureasilazane), polysilazane VL20 (Kion Coop.) and polycarbosilane (Starfire Systems SP‐MatrixTM) in alumina templates with defined pore channels is reported. After polymer infiltration, pyrolysis of the preceramic polymer at 1000–1100 °C in Ar atmosphere followed by dissolution of the alumina templates, ceramic nanowires and nanotubes were obtained. In the case of the polymeric ceramic precursor polysilazane, nanorods were formed only if an oligomeric fraction was distilled off from the polymer precursor prior to infiltration of the template. In contrast, the formation of nanotubes was found after infiltration of the untreated (crude) preceramic polymer. Despite the fact that the preceramic polymers contain silicon, carbon and nitrogen and no oxygen as constituting elements, the final ceramic nanostructures obtained were analysed consistantly by various techniques to contain oxygen and only limited amounts of carbon and nitrogen after pyrolysis consistent with a composition as silicon oxycarbide (SiOC). This behaviour strongly indicates that the porous alumina template may significantly influence the pyrolysis process of the precursors thus affecting the chemical composition of the final ceramic products. It is a central result of our study that the alumina templates are not inert under the reaction conditions employed instead acting as a reaction partner at the high temperatures employed during pyrolysis. Taking this into account, reaction of otherwise inert amorphous alumina with inorganic polymers at elevated temperatures could lead to a directed synthesis of new ceramic compositions.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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Section: Ceramic Nanowires Derived From 40 V Paox Templatesmentioning

confidence: 99%

Polymer‐Derived SiOC Nanotubes and Nanorods via a Template Approach

et al. 2009

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“…There are mainly three methods for separating the AAO film from remaining Al substrate. One way is to use an electrochemical detachment method, where a reverse voltage is applied [33,55]. The second is to perform electrochemical etching in 20% HCl with an operating potential of 15 V [56].…”

Section: Aao Templatementioning

confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

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“…Beide Größen können mithilfe von BET-Messungen oder durch Bildanalyse erhalten werden. Die Porosität e ist über das Verhältnis von Hohlvolumen V V zu Gesamtvolumen V T nach Gleichung (1) [10] von porö-sem Aluminiumoxid 0.1, sie kann jedoch durch Aufweitung der Poren durch nasschemisches ¾tzen [11] weiter erhöht werden.…”

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Ein nanostrukturierter chemischer Reaktor in Chipgröße

Popp

Schneider

2008

Angewandte Chemie

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Mit einer mechanisch stabilen, flexiblen und porösen Funktionseinheit aus Kohlenstoffnanoröhren kann ein kontinuierlich betriebener nanostrukturierter Reaktor realisiert werden (siehe Bild). Je nach Röhrendurchmesser und ‐abstand erreicht der Reaktor extrem hohe Oberfläche‐Volumen‐Verhältnisse (bis 2×107 m2 m−3), was die Kennzahlen aktueller Mikroreaktoren um mindestens zwei Größenordnungen übertrifft.

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Freestanding, Highly Flexible, Large Area, Nanoporous Alumina Membranes with Complete Through‐Hole Pore Morphology

Cited by 68 publications

References 24 publications

Polymer‐Derived SiOC Nanotubes and Nanorods via a Template Approach

Polymer‐Derived SiOC Nanotubes and Nanorods via a Template Approach

Carbon nanotubes prepared by anodic aluminum oxide template method

Ein nanostrukturierter chemischer Reaktor in Chipgröße

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