Wetting of decagonal Al<sub>13</sub>Co<sub>4</sub>and cubic AlCo thin films by liquid Pb

Bergman, C.; Girardeaux, Christophe; Perrin-Pellegrino, Carine; Gas, P.; Chatain, Dominique; Dubois, Jean‐Marie; Rivier, N.

doi:10.1080/14786430500318894

Cited by 4 publications

(8 citation statements)

References 8 publications

(11 reference statements)

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“…These values match our experimental observations when available, assessing the validity of our theoretical approach. For Pb(111)/Al 13 Co 4 (100), our theoretical value is rather different from the value published in ref (45°). Such discrepancy is attributed to the differences between the experimental and theoretical substrates.…”

Section: Resultscontrasting

confidence: 99%

“…Such discrepancy is attributed to the differences between the experimental and theoretical substrates. The calculation considered the single crystalline Al 13 Co 4 (100) homogeneous surface, while the experimental study of ref relies on a polycrystalline thin film prepared by evaporation of Al/Co multilayers followed by an appropriate annealing treatment, the nominal Al/Co atomic ratio of the sample corresponding to 13:4 on average. Such surface probably presents increased roughness as well as both structural and chemical heterogeneity compared to the homogeneous single crystal (100) surface considered in the calculations.…”

Section: Resultsmentioning

confidence: 99%

“…A few attempts have been carried out to disentangle the intrinsic contributions of the Al-based quasicrystalline substrate from those of the oxide layer. 23,24 From the experimental point of view, such a goal is challenging. It requires ultra-high vacuum (UHV) conditions and a careful preparation of the system: deposition of a metal thin film on a clean surface free from any contaminants, in situ dewetting https://dx.doi.org/10.1021/acsami.9b20653 leading to the formation of droplets, and determination of the contact angle using Scanning Electron Microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

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Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Anand

Fournée

Prévot

et al. 2020

ACS Appl. Mater. Interfaces

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Good wetting is generally observed for liquid metals on metallic substrates, while poor wetting usually occurs for metals on insulating oxides. In this work, we report unexpected large contact angles for lead on two metallic approximants to decagonal quasicrystals, namely, Al 5 Co 2 and Al 13 Co 4 . Intrinsic surface wettability is predicted from first principles, using a thermodynamic model based on the Young equation, and validated by the good agreement with experimental measurements performed under ultra-high vacuum by scanning electron microscopy. The atomistic details of the atomic and electronic structures at the Pbsubstrate interface, and the comparison with Pb(111)/Al(111), underline the influence of the specific electronic structures of quasicrystalline approximants on wetting. Our work suggests a possible correlation of the contact angles with the density of states at the Fermi energy and paves the way for a better fundamental understanding of wettability on intermetallic substrates, which has potential consequences in several applications such as supported catalysts, protective coatings, or crystal growth.

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Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Anand

Fournée

Prévot

et al. 2020

ACS Appl. Mater. Interfaces

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“…In a previous work [15], in order to investigate the effect of the structure on the wetting properties, a comparative study of the wetting of Pb on the surface of thin polycrystalline films of two compounds in the Al/Co system-one with a cubic (CsCl type) crystalline and the other with a decagonal quasicrystalline structure-has been performed. From this study, we deduced that the contact angles observed on both Al-Co compounds were slightly influenced by the crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

Contact angles of liquid metals on quasicrystals

Bergman

Girardeaux

Perrin-Pellegrino

et al. 2008

J. Phys.: Condens. Matter

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Wetting with µm-sized Pb droplets on thin polycrystalline films of decagonal Al13Co4 is reported. The films were prepared under high vacuum conditions in order to have Pb droplets lying on a clean surface. The method used is sequential deposition and annealing of specific stackings of Al and Co layers of nanometric thicknesses. A 300 nm thick Pb slab was then deposited on top of the films and dewetting experiments were followed in situ in a scanning Auger microprobe. The contact angle between the Pb droplet and the surface of the film is measured to be 49° ± 7°. Further investigation performed by cross section transmission electron microscopy allows us to better characterize the interface. Taking into account the rugosity of the film, it is concluded that there is partial wetting of the film, which corresponds to a smaller contact angle. The comparison with other results obtained either with pure metals or with a cubic AlCo compound leads to the conclusion that the wetting behaviour of Pb on the surface of a decagonal compound is close to that of a metal with a high melting point and not significantly different from that of a crystalline compound with a small unit cell.

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“…This idea is well reflected in Young's equation, which is expressed as [19][20][21][22] sv − sl = lv cos ,…”

Section: Introductionmentioning

confidence: 99%

Progress in Wettability Study of Reactive Systems

Komolafe

Medraj

2014

Journal of Metallurgy

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A review of various factors affecting wetting and spreading has been presented. Various methods for wettability studies and critical issues concerning contact angle measurement are discussed. Reactive wetting has been given a special attention in the paper and recent developments in this area are summarized and discussed. Although advanced understanding of nonreactive wetting is currently available in the literature, complete understanding of reactive wetting is still lacking due to the complexity of the phenomenon. To date, there is no single model that is generally applicable to all reactive wetting systems. Reaction between the liquid drop and substrate can take the form of dissolution, intermetallic formation, or combination of both processes. Factors affecting wettability have been summarized and discussed as well as the major available techniques to investigate wetting behaviour.

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Wetting of decagonal Al₁₃Co₄and cubic AlCo thin films by liquid Pb

Cited by 4 publications

References 8 publications

Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Contact angles of liquid metals on quasicrystals

Progress in Wettability Study of Reactive Systems

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Wetting of decagonal Al13Co4and cubic AlCo thin films by liquid Pb

Cited by 4 publications

References 8 publications

Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Nonwetting Behavior of Al–Co Quasicrystalline Approximants Owing to Their Unique Electronic Structures

Contact angles of liquid metals on quasicrystals

Progress in Wettability Study of Reactive Systems

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Wetting of decagonal Al₁₃Co₄and cubic AlCo thin films by liquid Pb