Aktive Anode auf Molybdänbasis für dehydrierende Kupplungen

Beil, Sebastian B.; Müller, Timo; Sillart, Sydney B.; Franzmann, P.D.; Bomm, Alexander; Holtkamp, Michael; Kärst, Uwe; Schade, Wolfgang; Waldvogel, Siegfried R.

doi:10.1002/ange.201712718

Cited by 24 publications

(7 citation statements)

References 57 publications

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“…Our general setup for laser surface processing with femtosecond pulses has been described previously. [49] Here, a Nd:YAG nanosecond laser source (Big Sky Ultra) with a centre wavelength of λ = 1064 nm and a pulse length of τ = 6 ns has been integrated in the setup. Spot diameters are given at the threshold width of 1/e 2 .…”

Section: Methodsmentioning

confidence: 99%

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

Rauh

Wöbbeking

et al. 2020

ChemPhysChem

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A conical microstructure is one of the most versatile surface textures obtained by ultrashort laser micromachining. Besides an increased surface area, unique surface properties such as superhydrophilicity, increased absorptivity; and thermal emissivity can be tailored. On metals, usually ultrashort laser pulses in the femtosecond to low picosecond range are used to obtain these surface structures, whereas nanosecond laser pulses favor melting processes. Herein, we report on an investigation of reactive gas atmospheres such as oxygen, steam, and halogens during laser micromachining of aluminum with 6 ns laser pulses. At a reduced pressure of 20 hPa (air) with additional iodine vapor as reactive species, we found a perfectly microconical structured surface to be formed with nanosecond laser pulses. The resulting surface structures were proven to be free of residual halogens. The application of nanosecond instead of femtosecond laser pulses for the surface structuring process allows to apply significantly less complex laser sources.

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Section: Methodsmentioning

confidence: 99%

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

Rauh

Wöbbeking

et al. 2020

ChemPhysChem

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“…It is not only molybdenum(V) complexes that are useful mediators in the oxidative formation of new C−C bonds. An electrochemical system consisting of an active molybdenum anode, a graphite cathode, and HFIP as a mediator was found to be highly effective in the dehydrogenative homocoupling of simple electron‐rich arenes . The elaborated method tolerates a broad scope of arenes and is particularly important, especially for environmental reasons, as it does not generate a large amount of reagent waste.…”

Section: Intermolecular Oxidative Aromatic Couplingmentioning

confidence: 99%

Synthetic Applications of Oxidative Aromatic Coupling—From Biphenols to Nanographenes

et al. 2019

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Oxidative aromatic coupling occupies a fundamental place in the modern chemistry of aromatic compounds. It is a method of choice for the assembly of large and bewildering architectures. Considerable effort was also devoted to applications of the Scholl reaction for the synthesis of chiral biphenols and natural products. The ability to form biaryl linkages without any prefunctionalization provides an efficient pathway to many complex structures. Although the chemistry of this process is only now becoming fully understood, this reaction continues to both fascinate and challenge researchers. This is especially true for heterocoupling, that is, oxidative aromatic coupling with the chemoselective formation of a C−C bond between two different arenes. Analysis of the progress achieved in this field since 2013 reveals that many groups have contributed by pushing the boundary of structural possibilities, expanding into surface‐assisted (cyclo)dehydrogenation, and developing new reagents.

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“…The general setup for laser surface processing used here has been described earlier [72,73] . An AMPHOS 400 Yb:YAG high power laser system with a centre wavelength of λ =1030 nm and a pulse length of τ =750 has been used as beam source.…”

Section: Methodsmentioning

confidence: 99%

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

Fedorov

Lederle

et al. 2021

ChemPlusChem

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Coatings based on titanium nitrides, titanium carbides and silicon carbides can optimize the surface properties of titanium or silicon for various applications ranging from biocompatibility to chemical stability and durability. Here, we investigated a high power (100 W) high pulse repetition rate femtosecond laser process (λ=1030 nm, τ=750 fs, f=1 MHz) for the treatment of titanium and silicon in atmospheres of argon, nitrogen, methane, ethene and acetylene. In a nitrogen atmosphere, a homogeneous coating of TiON is formed on titanium. In an ethene/argon atmosphere coatings of TiOC and SiC are formed on Ti and Si, respectively. The process allows a fast surface transformation with a process rate of 0.33 cm2 s−1 and a high spatial resolution below 0.5 mm with a minimal heat affected zone at the same time. In contrast to low repetition rate femtosecond laser processed samples, the surfaces are more robust against mechanical impact. At the same time, the surfaces reveal a distinct microstructure in comparison to coatings obtained by vapor deposition techniques.

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Aktive Anode auf Molybdänbasis für dehydrierende Kupplungen

Cited by 24 publications

References 57 publications

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

Synthetic Applications of Oxidative Aromatic Coupling—From Biphenols to Nanographenes

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

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