The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production

Cherepanov, Pavel V.; Melnyk, Inga; Skorb, Ekaterina V.; Fratzl, Peter; Zolotoyabko, E.; Dubrovinsky, Leonid; Avadhut, Yamini S.; Senker, Jürgen; Leppert, Linn; Kümmel, Stephan; Andreeva, Daria V.

doi:10.1039/c5gc00047e

Cited by 37 publications

(42 citation statements)

References 31 publications

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“…Recently the continuous oxidation of Al by HIUS in water was investigated by XRD and solid state 27 Al NMR [7]. The formation of metastable Al hydroxides (bayerite and boehmite) was observed.…”

Section: Effect Of Hius On Morphology and Crystallinity Of Al Surfacementioning

confidence: 98%

“…Additionally, HIUS treatment of sonication medium leads to its sonolysis -generation of free radicals that trigger surface red-ox reactions [24,25]. By appropriate sonication medium choice during HIUS treatment, it is possible to control the amount of cavitation energy that can be supplied to metal surface [26] and interfacial red-ox processes [27]. Thus, use of particular sonication is essential for the achievement of desirable microstructural and morphological properties of metals.…”

Section: Introductionmentioning

confidence: 99%

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Controllable manipulation of crystallinity and morphology of aluminium surfaces using high intensity ultrasound

2016

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Section: Effect Of Hius On Morphology and Crystallinity Of Al Surfacementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Controllable manipulation of crystallinity and morphology of aluminium surfaces using high intensity ultrasound

2016

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“…Additional treatment with ultrasound [17] can be an attractive method for the production of a partially crystalline titania nanofoam layer strongly adhering to the substrate. It has been used for the development of multifunctional nanomaterials such as bimetallic nanoparticles [18,19], magnetic nanoparticles [20], nanocomposites [21], mesoporous metal surfaces and sponges [22]. The effect of ultrasound irradiation on the surface morphology and physicochemical properties has been demonstrated in various studies [23,24].…”

Section: Max Planck Institute Of Colloids and Interfaces · Author Manmentioning

confidence: 99%

Ultrasound-driven titanium modification with formation of titania based nanofoam surfaces

Zhukova

Ulasevich

Dunlop

et al. 2017

Ultrasonics Sonochemistry

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Titanium has been widely used as biomaterial for various medical applications because of its mechanical strength and inertness. This on the other hand makes it difficult to structure it. Nanostructuring can improve its performance for advanced applications such as implantation and lab-on-chip systems. In this study we show that a titania nanofoam on titanium can be formed under high intensity ultrasound (HIUS) treatment in alkaline solution. The physicochemical properties and morphology of the titania nanofoam are investigated in order to find optimal preparation conditions for producing surfaces with high wettability for cell culture studies and drug delivery applications. AFM and contact angle measurements reveal, that surface roughness and wettability of the surfaces depend nonmonotonously on ultrasound intensity and duration of treatment, indicating a competition between HIUS induced roughening and smoothening mechanisms. We finally demonstrate that superhydrophilic bio-and cytocompatible surfaces can be fabricated with short time ultrasonic treatment

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“…First-principles electronic-structure theory [1][2][3][4][5][6][7][8][9][10][11][12][13] allows to gain unbiased insights into the microscopic, quantum-mechanical effects that are at the heart of modern nanotechnology [14][15][16][17][18][19][20][21][22][23][24] . However, often full ab-initio studies on systems of experimental relevance remain challenging since the computational effort grows immensely with system size 25 .…”

Section: Motivationmentioning

confidence: 99%

Investigating the electronic structure of a supported metal nanoparticle: Pd in SiCN

Schmidt

Albuquerque

Kempe

et al. 2016

Phys. Chem. Chem. Phys.

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We investigate the electronic structure of a Palladium nanoparticle that is partially embedded in a matrix of silicon carbonitride. From classical molecular dynamics simulations we first obtain a representative atomic structure. This geometry then serves as input to density-functional theory calculations that allow us to access the electronic structure of the combined system of particle and matrix. In order to make the computations feasible, we devise a subsystem strategy for calculating the relevant electronic properties. We analyze the Kohn-Sham density of states and pay particular attention to d-states which are prone to be affected by electronic self-interaction. We find that the density of states close to the Fermi level is dominated by states that originate from the Palladium nanoparticle. The matrix has little direct effect on the electronic structure of the metal. Our results contribute to explaining why silicon carbonitride does not have detrimental effects on the catalytic properties of palladium particles and can serve positively as a stabilizing mechanical support. MotivationFirst-principles electronic-structure theory 1-13 allows to gain unbiased insights into the microscopic, quantum-mechanical effects that are at the heart of modern nanotechnology [14][15][16][17][18][19][20][21][22][23][24] . However, often full ab-initio studies on systems of experimental relevance remain challenging since the computational effort grows immensely with system size 25 . For instance, in many experiments metal nanoparticles that have a diameter of several nm and contain several hundreds or thousands of atoms are used. For such systems, tens of thousands of electrons have to be taken into account for first-principles studies. Even with modern computers using massive parallelization, geometry optimizations and detailed investigations of the electronic structure of systems of that size are out of reach. Therefore, strategies have to be devised how insights can be gained into large systems despite of these computational limitations. In this work, we take a first step in this direction and investigate a palladium nanoparticle which is partially embedded in a matrix of silicon carbonitride (SiCN).This system is of practical relevance because noble-metal nanoparticles, in particular nanoparticles containing Pd, are effective catalysts for a wide range of chemical reactions [26][27][28][29][30] . In comparison to bulk metals, nanoparticles exhibit a high surface-

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The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production

Cited by 37 publications

References 31 publications

Controllable manipulation of crystallinity and morphology of aluminium surfaces using high intensity ultrasound

Controllable manipulation of crystallinity and morphology of aluminium surfaces using high intensity ultrasound

Ultrasound-driven titanium modification with formation of titania based nanofoam surfaces

Investigating the electronic structure of a supported metal nanoparticle: Pd in SiCN

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