R
Rolf Hempelmann
Researcher at Saarland University
Publications - 313
Citations - 7841
Rolf Hempelmann is an academic researcher from Saarland University. The author has contributed to research in topics: Nanocrystalline material & Ionic liquid. The author has an hindex of 43, co-authored 302 publications receiving 6974 citations. Previous affiliations of Rolf Hempelmann include Clausthal University of Technology & Kigali Institute of Science and Technology.
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Electrodeposition of nanocrystalline metals and alloys from ionic liquids
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Nanocrystalline nickel and nickel-copper alloys: Synthesis, characterization, and thermal stability
TL;DR: In this article, the influence of the physical and chemical deposition parameters on the nanostructure of the deposits and demonstrate that the grain size can be tuned to values between 13 and 93 nm, with rather narrow grain size distribution.
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Nanocrystalline Copper by Pulsed Electrodeposition: The Effects of Organic Additives, Bath Temperature, and pH
Harald Natter,Rolf Hempelmann +1 more
TL;DR: In this article, the effects of organic additives, bath temperature, and pH on the nanostructure of nano-copper were investigated for nano-Pd and they demonstrated how the shape of the current pulses influenced the grain size.
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Grain-growth kinetics of nanocrystalline iron studied in situ by synchrotron real-time X-ray diffraction
TL;DR: In this paper, the Bragg peak line shapes of the large number of diffractograms are analyzed using a Warren/Averbach procedure improved with respect to reliability and efficiency, and two regimes of grain growth are observed: at less elevated temperatures grain growth is smooth and moderate up to limiting size values between 50 and 100 nm, depending on temperature.
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Electrodeposition of nano- and microcrystalline aluminium in three different air and water stable ionic liquids.
TL;DR: It was found that nanocrystalline aluminium can be electrodeposited in the ionic liquid [BMP]Tf2N saturated with AlCl3, and deposits obtained are generally uniform, dense, shining, and adherent with very fine crystallites in the nanometer size regime.