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Browsing by Author "21308257-7b0d-4b29-87b2-42c51ba5ee28"

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All-Oxide Thermoelectric Module with in Situ Formed Non-Rectifying Complex p–p–n Junction and Transverse Thermoelectric Effect

Kanas, Nikola; Bittner, Michael; Debelo Desissa, Temesgen; Singh, Sathya Prakash; Norby, Truls; Feldhoff, Armin; Grande, Tor; Wiik, Kjell; Einarsrud, Mari-Ann (Washington D.C. : American Chemical Society, 2018)

All-oxide thermoelectric modules for energy harvesting are attractive because of high-temperature stability, low cost, and the potential to use nonscarce and nontoxic elements. Thermoelectric modules are mostly fabricated ...
Ceramic-based thermoelectric generator processed via spray-coating and laser structuring

Wolf, Mario; Abt, Marvin; Hoffmann, Gerd; Overmeyer, Ludger; Feldhoff, Armin (Amsterdam : Elsevier, 2020)

Processing technology to improve the manufacturing of thermoelectric generators (TEGs) is a growing field of research. In this paper, an adaptable and scalable process comprising spray-coating and laser structuring for ...
Combination of Laser and Thermal Sintering of Thermoelectric Ca3Co4O9 Films

Wolf, Mario; Rehder, Lena; Steinbach, Frank; Abt, Marvin; Hinterding, Richard; Overmeyer, Ludger; Feldhoff, Armin (Weinheim : Wiley-VCH Verl., 2021)

The manufacturing technology of thermoelectric materials is laborious and expensive often including complex and time-intensive preparation steps. In this work, a laser sintering process of the oxide-based thermoelectric ...
Cu-Ni-Based Alloys from Nanopowders as Potent Thermoelectric Materials for High-Power Output Applications

Wolf, Mario; Flormann, Jan; Steinhoff, Timon; Gerstein, Gregory; Nürnberger, Florian; Maier, Hans Jürgen; Feldhoff, Armin (Basel : MDPI, 2022)

A new approach for the development of thermoelectric materials, which focuses on a high-power factor instead of a large figure of merit zT, has drawn attention in recent years. In this context, the thermoelectric properties ...
Electrospun Ca3Co4−xO9+δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Kruppa, Katharina; Maor, Itzhak I.; Steinbach, Frank; Beilin, Vadim; Mann‐Lahav, Meirav; Wolf, Mario; Grader, Gideon S.; Feldhoff, Armin (Oxford [u.a.] : Wiley-Blackwell, 2022)

Oxide-based ceramics offer promising thermoelectric (TE) materials for recycling high-temperature waste heat, generated extensively from industrial sources. To further improve the functional performance of TE materials, ...
Experimental application of a laser-based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft

Abt, Marvin; Kruppa, Katharina; Wolf, Mario; Feldhoff, Armin; Overmeyer, Ludger (Hoboken, NJ : Wiley, 2022)

Geometry, design, and processing in addition to the thermoelectric material properties have a significant influence on the economic efficiency and performance of thermoelectric generators (TEGs). While conventional BULK ...
Freezing and melting transitions of liquids in mesopores with ink-bottle geometry

Khokhlov, Alexey; Valiullin, Rustem; Kaerger, Joerg; Steinbach, Frank; Feldhoff, Armin (Bristol : IOP Publishing Ltd., 2007)

Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using H-1 NMR cryoporometry. With the bulk phase surrounding the porous ...
Geometry Optimization of Thermoelectric Modules: Deviation of Optimum Power Output and Conversion Efficiency

Wolf, Mario; Rybakov, Alexey; Hinterding, Richard; Feldhoff, Armin (Basel : MDPI AG, 2020)

Besides the material research in the field of thermoelectrics, the way from a material to a functional thermoelectric (TE) module comes alongside additional challenges. Thus, comprehension and optimization of the properties ...
Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Aqueous Extract with the Evaluation of Its Antibacterial Activity against Clinical and Food Pathogens

Alahmad, Abdalrahim; Al-Zereini, Wael A.; Hijazin, Tahani J.; Al-Madanat, Osama Y.; Alghoraibi, Ibrahim; Al-Qaralleh, Omar; Al-Qaraleh, Samer; Feldhoff, Armin; Walter, Johanna-Gabriela; Scheper, Thomas (Basel : MDPI, 2022)

The rapid development of nanotechnology and its applications in medicine has provided the perfect solution against a wide range of different microbes, especially antibiotic-resistant ones. In this study, a one-step approach ...
High power factor vs. high zT-A review of thermoelectric materials for high-temperature application

Wolf, Mario; Hinterding, Richard; Feldhoff, Armin (Basel : MDPI AG, 2019)

Energy harvesting with thermoelectric materials has been investigated with increasing attention over recent decades. However, the vast number of various material classes makes it difficult to maintain an overview of the ...
High-resolution 27Al MAS NMR spectroscopic studies of the response of spinel aluminates to mechanical action

Šepelák, Vladimir; Bergmann, Ingo; Indris, Sylvio; Feldhoff, Armin; Hahn, Horst; Becker, Klaus-Dieter; Grey, Clare P.; Heitjans, Paul (Cambridge : Royal Society of Chemistry, 2011)

The response of the local structure of various types of spinel aluminates, ZnAl2O4 (normal spinel), MgAl2O4 (partly inverse spinel), and Li0.5Al2.5O4 (fully inverse spinel), to mechanical action through high-energy milling ...
Hydrogen-Tolerant La0.6Ca0.4Co0.2Fe0.8O3–d Oxygen Transport Membranes from Ultrasonic Spray Synthesis for Plasma-Assisted CO2 Conversion

Rashid, Aasir; Lim, Hyunjung; Plaz, Daniel; Escobar Cano, Giamper; Bresser, Marc; Wiegers, Katharina-Sophia; Confalonieri, Giorgia; Baek, Sungho; Chen, Guoxing; Feldhoff, Armin; Schulz, Andreas; Weidenkaff, Anke; Widenmeyer, Marc (Basel : MDPI, 2023)

La0.6Ca0.4Co1–xFexO3–d in its various compositions has proven to be an excellent CO2-resistant oxygen transport membrane that can be used in plasma-assisted CO2 conversion. With the goal of incorporating green hydrogen ...
Hypericum perforatum L.-Mediated Green Synthesis of Silver Nanoparticles Exhibiting Antioxidant and Anticancer Activities

Alahmad, Abdalrahim; Feldhoff, Armin; Bigall, Nadja C.; Rusch, Pascal; Scheper, Thomas; Walter, Johanna-Gabriela (Basel : MDPI, 2021)

This contribution focuses on the green synthesis of silver nanoparticles (AgNPs) with a size < 100 nm for potential medical applications by using silver nitrate solution and Hypericum Perforatum L. (St John’s wort) aqueous ...
Influence of Low-Pressure Treatment on the Morphological and Compositional Stability of Microscopic Ettringite

Kißling, Patrick A.; Lübkemann, Franziska; von Bronk, Tabea; Cotardo, Dario; Lei, Lei; Feldhoff, Armin; Lohaus, Ludger; Haist, Michael; Bigall, Nadja C. (Basel : MDPI, 2021)

The impact of low-pressure treatment on the crystal structure, morphology, and chemical composition of ettringite, due to their major importance with respect to processability (i.a., dry-ing conditions) and to the analysis ...
Laser generation of CeAlO3 nanocrystals with perovskite structure

Vasylkovskyi, Volodymyr; Bespalova, Iryna; Gryshkov, Oleksandr; Slipchenko, Mykola; Tkachenko, Serhii; Arhipov, Pavlo; Gerasymov, Iaroslav; Zholudov, Yuriy; Zhao, Zhijun; Feldhoff, Armin; Sorokin, Aleksander; Slipchenko, Olena; Grynyov, Borys; Chichkov, Boris (Berlin ; Heidelberg ; New York : Springer, 2023)

For the first time to the best of our knowledge, CeAlO3 nanocrystals with perovskite structure are synthesized by pulsed laser ablation technique. The morphological and optical properties of the obtained CeAlO3 nanocrystals ...
Mechanosynthesis of nanocrystalline fayalite, Fe 2SiO 4

Šepelák, Vladimir; Myndyk, Maxym; Fabián, Martin; Da Silva, Klebson Lucenildo; Feldhoff, Armin; Menzel, Dirk; Ghafari, Mohammad; Hahn, Horst; Heitjans, Paul; Becker, Klaus-Dieter (Cambridge : Royal Society of Chemistry, 2012)

Nanostructured fayalite (α-Fe 2SiO 4) with a large volume fraction of interfaces is synthesized for the first time via single-step mechanosynthesis, starting from a 2α-Fe 2O 3 + 2Fe + 3SiO 2 mixture. The nonequilibrium ...
Modulation of the electron transfer processes in Au-ZnO nanostructures

Aguirre, Matias E.; Armanelli, A.; Perelstein, Gonzalo; Feldhoff, Armin; Tolley, Alfredo J.; Grela, Maria A. (Cambridge : Royal Society of Chemistry, 2015-03-12)

Plasmonic nanostructures comprising Au and ZnO nanoparticles synthesized by the spontaneous reduction of HAuCl4 in ethylene glycol were used to assess the possibility of modulating the direction of the electron transfer ...
Multiplying Oxygen Permeability of a Ruddlesden-Popper Oxide by Orientation Control via Magnets

Zhao, Zhijun; Chen, Guoxing; Escobar Cano, Giamper; Kißling, Patrick A.; Stölting, Oliver; Breidenstein, Bernd; Polarz, Sebastian; Bigall, Nadja C.; Weidenkaff, Anke; Feldhoff, Armin (Weinheim : Wiley-VCH, 2023)

Ruddlesden-Popper-type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade-off by leveraging the ...
Nanoporous silica coatings on implant surfaces: characterization, stability, biocompatibility and drug release properties

Ehlert, Nina; Lüßenhop, Tammo; Krüger, Ilka; Feldhoff, Armin; Badar, Muhammad; Müller, Peter P.; Stieve, Martin; Lenarz, Thomas; Behrens, Peter (Berlin: Walter de Gruyter, 2013-05-28)

Nanoporous silica coatings for drug release purposes were prepared on medical implants. As substrate, we chose Bioverit® II, which is a commercial available glass-mica ceramic implant material. The coating was prepared by ...
A new CO2-resistant Ruddlesden-Popper oxide with superior oxygen transport: A-site deficient (Pr0.9La0.1)1.9(Ni0.74Cu0.21Ga0.05)O4+δ

Xue, Jian; Liao, Qing; Chen, Wei; Bouwmeester, Henny J. M.; Wang, Haihui; Feldhoff, Armin (Cambridge : Royal Society of Chemistry, 2015-08-10)

A-site deficient (Pr0.9La0.1)1.9Ni0.74Cu0.21Ga0.05O4+δ ((PL)1.9NCG), with the K2NiF4 structure, is found to exhibit higher oxygen transport rates compared with its cation-stoichiometric parent phase. A stable oxygen ...

Now showing items 1-20 of 31

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