This perspective accounts for the benefits of the high resolution hard X-ray spectroscopic methods HERFD-XANES and valence-to-core-XES.
}}, author = {{Bauer, Matthias}}, issn = {{1463-9076}}, journal = {{Phys. Chem. Chem. Phys.}}, keywords = {{Physical and Theoretical Chemistry, General Physics and Astronomy}}, number = {{27}}, pages = {{13827--13837}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{HERFD-XAS and valence-to-core-XES: new tools to push the limits in research with hard X-rays?}}}, doi = {{10.1039/c4cp00904e}}, volume = {{16}}, year = {{2014}}, } @article{25945, abstract = {{Catalysis plays a central role in many fields of life, e.g., in biochemical processes, to reduce energy costs and resources in chemical industry and to decrease or even avoid environmental pollution and in energy management. Porous alumina (Al2O3) is an essential material in various applications, especially as a support material for catalysts. It is often prepared by nanocasting using porous carbon materials that serve as rigid structure matrices. In this work, an alternative way to synthesize mesoporous Al2O3 by using hydrogels as porogenic material is presented. Hydrogels can easily be patterned by light and used to imprint their structure onto alumina opening a new approach to fabricate patterned Al2O3. The hydrogels used in this work are based on poly(dimethylacrylamide) and were photo-chemically cross-linked. Followed by a nanocasting process, mesoporous alumina samples were synthesized and characterized by N2 physisorption and X-ray diffraction. The cross-linker amount in the polymer network was varied and the influence on the properties of the Al2O3 is analyzed.}}, author = {{Birnbaum, Wolfgang and Weinberger, Christian and Schill, Verena and Haffer, Stefanie and Tiemann, Michael and Kuckling, Dirk}}, issn = {{0303-402X}}, journal = {{Colloid and Polymer Science}}, pages = {{3055--3060}}, title = {{{Synthesis of mesoporous alumina through photo cross-linked poly(dimethylacrylamide) hydrogels}}}, doi = {{10.1007/s00396-014-3379-5}}, year = {{2014}}, } @article{25946, abstract = {{The synthesis of a periodically ordered, nanostructured composite consisting of CoFe2O4 and BaTiO3 is presented. In a first step, mesoporous CoFe2O4 is prepared by the structure replication method (nanocasting) using mesoporous KIT-6 silica as a structural mold. Subsequently, BaTiO3 is created inside the pores of CoFe2O4 by the citrate route, resulting in a well-ordered composite material of both phases. The two components are known for their distinct ferroic properties, namely ferrimagnetism (CoFe2O4) and ferroelectricity (BaTiO3), respectively. Therefore, this proof of synthesis concept offers new perspectives in the fabrication of composite materials with multiferroic properties.}}, author = {{Haffer, Stefanie and Lüder, Christian and Walther, Till and Köferstein, Roberto and Ebbinghaus, Stefan G. and Tiemann, Michael}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{300--304}}, title = {{{A synthesis concept for a nanostructured CoFe2O4/BaTiO3 composite: Towards multiferroics}}}, doi = {{10.1016/j.micromeso.2014.05.023}}, year = {{2014}}, } @article{25948, abstract = {{Ordered mesoporous silica phases (e.g. KIT-6, SBA-15) are used as structure matrices for negative replica structures of mesoporous In2O3. We present a detailed study on how the controlled synthesis of mono-, bi- and trimodal pore systems in the products is accomplished by systematic variation of the procedure of infiltrating a precursor species (In(NO3)3) into the pores of the silica matrix and subsequent thermal conversion into In2O3. Melt impregnation and conversion in a closed reactor facilitates a one-step casting process for ordered mesoporous indium oxide (In2O3). We present a model based on variation of the pore filling.}}, author = {{Klaus, Dominik and Amrehn, Sabrina and Tiemann, Michael and Wagner, Thorsten}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{133--139}}, title = {{{One-step synthesis of multi-modal pore systems in mesoporous In2O3: A detailed study}}}, doi = {{10.1016/j.micromeso.2014.01.007}}, year = {{2014}}, } @inbook{25944, abstract = {{Recently indium oxide (In2O3) attracted attention as a material for sensing layers in semiconducting gas sensors. Compared to frequently investigated materials like tin dioxide (SnO2), tungsten trioxide (WO3), or gallium oxide (Ga2O3) indium oxide offers some unique properties. The most prominent one is its selectivity to oxidizing gases such as ozone (O3) or nitrogen dioxide (NO2) at low operating temperatures (<150°C). Combined with the photoreduction properties of nanocast, porous In2O3 highly selective sensing layers with a fast response can be prepared. In some cases even room temperature measurements are possible; therefore this material allows for designing low-power sensors without the need for special sensor substrates (e.g., μ-hotplates). Detailed analysis of the sensing mechanism reveals that known sensing models are not able to describe the observed effects. Therefore a new sensing model for ordered nanoporous In2O3 is presented which will be applicable for nonstructured material too.}}, author = {{Wagner, Thorsten and Donato, Nicola and Tiemann, Michael}}, booktitle = {{Springer Series on Chemical Sensors and Biosensors}}, issn = {{1612-7617}}, title = {{{New Sensing Model of (Mesoporous) In2O3}}}, doi = {{10.1007/5346_2013_57}}, year = {{2014}}, } @inbook{25950, abstract = {{In this paper, the development and validation of a shield prototype for resistive sensor array characterization with Arduino UNO, a platform based on ATmega328 microcontroller provided by ATMEL, is reported. The resistance variation of the sensor can be evaluated by properly choosing the capacitance value and by measuring the period (frequency) of a custom inverter-based oscillator. The GUI and the developed firmware are able to perform the real-time monitoring of the sensor responses. The developed shield is able to measure the response of up to six sensors under UV radiation by means of LED devices. First results carried out with resistive sensors based on mesoporous In2O3-based material under UV light exposure are reported.}}, author = {{Aloisio, D. and Donato, N. and Neri, G. and Latino, M. and Wagner, T. and Tiemann, Michael and Capra, P. P.}}, booktitle = {{Lecture Notes in Electrical Engineering}}, issn = {{1876-1100}}, title = {{{Arduino-Based Shield for Resistive Gas Sensor Array Characterization Under UV Light Exposure}}}, doi = {{10.1007/978-3-319-00684-0_79}}, year = {{2014}}, } @inbook{25949, abstract = {{Due to their unique properties, ordered mesoporous carbon (OMC) materials prepared by nanocasting have raised great attention in recent years. Their synthesis usually comprises multiple cycles of impregnating a porous structure matrix with an aqueous solution of a suitable precursor, such as sucrose or other, often hazardous, compound. We present a more straightforward variation of this method by using fructose as the precursor compound. By using a solvent-free melt of the precursor, the impregnation requires only a single step. After carbonization by thermal decomposition and removal of the mesoporous silica structure matrix (SBA-15), ordered mesoporous carbon with one (CMK-3) or two (CMK-5) pore modes in two-dimensional, hexagonal symmetry (p6mm) is obtained.}}, author = {{Weinberger, Christian and Haffer, S. and Wagner, T. and Tiemann, Michael}}, booktitle = {{ACS Symposium Series}}, issn = {{0097-6156}}, title = {{{Fructose as a Precursor for Mesoporous Carbon: Straightforward Solvent-Free Synthesis by Nanocasting}}}, doi = {{10.1021/bk-2014-1183.ch001}}, year = {{2014}}, } @article{25951, abstract = {{Nanoporous Materials, like carbons, silica and semiconducting metal oxides, play a major role in recent scientific research, especially in the fields of energy storage, catalysis, material separation and sensor technology. Thus, our aim is to focus on simple synthesis concepts for these materials, such as soft matter templating or nanocasting, which can be easily introduced by means of appropriate models in school chemistry education or school laboratories. In addition to facile and realizable syntheses in school, several experiments concerning catalysis and gas sensing will be presented, too. By these experiments the characteristics of nanoporous materials can be obviously demonstrated and additionally, these experiments can serve as a starting point for further experiments that could easily be developed by students themselves, particularly in relation to environmental issues.}}, author = {{Wilke, Timm and Haffer, Stefanie and Weinberger, Christian and Tiemann, Michael and Wagner, Thorsten and Waitz, Thomas}}, issn = {{1936-7449}}, journal = {{Journal of Nano Education}}, pages = {{117--123}}, title = {{{Nanoporous Materials: Synthesis Concepts and Model Experiments for School Chemistry Education}}}, doi = {{10.1166/jne.2014.1044}}, year = {{2014}}, } @article{25947, abstract = {{Ordered mesoporous carbon with a high heteroatom (N, O) content was prepared by nanocasting from a melt of a eutectic mixture of fructose and urea (60/40 wt.-%; melting temperature ca. 65 °C). These precursor compounds are cheap and environmentally friendly. The material possesses enhanced pore-wall surface polarity as compared to that of mesoporous carbon prepared by the same technique without urea. This was verified by water sorption analysis. As a result, the heteroatom-modified material shows higher sorption capacity for the uptake of heavy metal ions (Cu2+) from aqueous solution, which may be interesting for potential application in wastewater cleaning.}}, author = {{Weinberger, Christian and Haffer, Stefanie and Wagner, Thorsten and Tiemann, Michael}}, issn = {{1434-1948}}, journal = {{European Journal of Inorganic Chemistry}}, pages = {{2787--2792}}, title = {{{Fructose and Urea as Precursors for N-/O-Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions}}}, doi = {{10.1002/ejic.201402027}}, year = {{2014}}, } @article{41234, abstract = {{