Surface Tension and its Temperature Coefficient of Liquid Sn-X (X=Ag, Cu) Alloys

Lee, Joonho; Shimoda, Wataru; Tanaka, Toshihiro

doi:10.2320/matertrans.45.2864

Cited by 135 publications

(81 citation statements)

References 48 publications

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“…2. Using Cd(II), our first designs with these peptides yielded equilibrium mixtures of three-and fourcoordinate Cd(II) (55). By changing the leucine layer above the metal to alanine to allow better water access above the metalbinding site, we designed a peptide (TRI L12AL16C) that binds Cd(II) solely in a four-coordinate geometry, with three cysteinyl thiolates and one exogenous water.…”

Section: Discussionmentioning

confidence: 99%

Identifying important structural characteristics of arsenic resistance proteins by using designed three-stranded coiled coils

Touw

Nordman

Stuckey³

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

154

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Arsenic, a contaminant of water supplies worldwide, is one of the most toxic inorganic ions. Despite arsenic's health impact, there is relatively little structural detail known about its interactions with proteins. Bacteria such as Escherichia coli have evolved arsenic resistance using the Ars operon that is regulated by ArsR, a repressor protein that dissociates from DNA when As(III) binds. This protein undergoes a critical conformational change upon binding As(III) with three cysteine residues. Unfortunately, structures of ArsR with or without As(III) have not been reported. Alternatively, de novo designed peptides can bind As(III) in an endo configuration within a thiolate-rich environment consistent with that proposed for both ArsR and ArsD. We report the structure of the As(III) complex of Coil Ser L9C to a 1.8-Å resolution, providing x-ray characterization of As(III) in a Tris thiolate protein environment and allowing a structural basis by which to understand arsenated ArsR.arsenic-binding proteins ͉ coiled coil peptides ͉ crystallography ͉ heavy metal toxicity ͉ protein design A rsenic toxicity is a worldwide problem as a natural contaminant of water supplies. Despite the fact that it is a human toxin and carcinogen, few structural reports on its interaction with biological ligands have appeared. Escherichia coli and other bacteria have evolved a detoxification mechanism that employs the arsRDABC operon (1). Arsenic removal by these encoded proteins is initiated when As(III) binds to ArsR, resulting in the dissociation of the repressor protein from the promoter DNA. The structure of the ArsA component of the ATP-dependent extrusion pump ArsAB with antimonite bound in close proximity to the nucleotide-binding site was able to provide some insight into the active transport of As(III) out of the cell (2). Additionally, structural characterization of substrate and product complexes of the arsenate reductase ArsC, which reduces arsenate (AsO 4 3Ϫ ) to arsenite (AsO 2 Ϫ ), has helped elucidate this step of the arsenic detoxification pathway (3, 4). Recent studies of E. coli ArsD indicate that it is a metallochaperone, transporting As(III) to ArsA for extrusion (5). Extended x-ray absorption fine structure and mutagenesis studies have shown that ArsR coordinates As(III) with three cysteine thiolates at a distance of 2.25 Å, a coordination mode that ArsD is also proposed to employ (1, 5). However, no x-ray or NMR structures of ArsR, the repressor protein, or ArsD have been reported to date. Furthermore, AsS 3 structures have not been reported for any biologically relevant small-molecule thiolates, such as glutathione, and only a handful of related AsS 3 complexes with aromatic ligands or chelated alkyl dithiolate coordination are reported (6).We set out to model the putative As(III) coordination environments of ArsR and ArsD in a designed peptide system. Previously, we have shown that the three-stranded coiled coildesigned with the heptad repeat strategy, such as TRI L16C (sequences of all peptides are in Table 1...

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Section: Discussionmentioning

confidence: 99%

Identifying important structural characteristics of arsenic resistance proteins by using designed three-stranded coiled coils

Touw

Nordman

Stuckey³

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

154

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“…Surface tension (average values from literature in list: [3,[18][19][20][21][22][23][24][25] for Cu, [24,[26][27][28][29][30][31] for Ni):…”

Section: Thermodynamic Calculation Of the Cu-ni Nanoalloy Phase Diagrammentioning

confidence: 99%

Cu–Ni nanoalloy phase diagram – Prediction and experiment

Sopoušek

Vřešťál

Pinkas

et al. 2014

Calphad

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited.

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“…The arrow represents the final pressure applied to produce a partly infiltrated composite (Al2O3/Cu-20at.%Sn, 2.03 MPa during approximately 1 hour). [35][36] and b contact angle θ of alumina on Cu-Sn system from [2]. Values used to normalize the drainages curves, see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 5 gives literature values for σLV in Cu-Sn alloys (Fig. 5a) [35][36] and θ for the Al2O3/Cu-Sn system (Fig. 5b) [2].…”

Section: Link With the Surface Tension And/or The Work Of Immersionmentioning

confidence: 99%

“…This contribution is an extension of that work to tin bronze : we present here drainage curves that quantify the wetting during infiltration of porous Al2O3 preforms by Cu-Sn molten alloys, covering the entire alloy spectrum from pure Cu to pure Sn. This ceramic-metal system is interesting because of its potential for engineering application (bronze having attractive mechanical properties, particularly in bearings), but also because reliable sessile drop data exist in the literature for Cu-Sn alloys on alumina, across the entire spectrum of compositions from pure Cu to pure Sn [2,[35][36]. This system is furthermore somewhat peculiar in that the molten metal surface tension varies significantly (by a factor 2.5) as the composition transitions from Cu to Sn, while the contact angle varies little (from 122 to 128°; corresponding to a roughly 15% variation in cosθ).…”

Section: Introductionmentioning

confidence: 99%

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Infiltration of tin bronze into alumina particle beds: influence of alloy chemistry on drainage curves

2014

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The wetting of angular alumina particle preforms by Cu-Sn alloys is investigated by means of pressure infiltration experiments conducted at 1150°C, using a system enabling dynamic and precise measurements of the metal volume injected into the preform. Wetting is quantified in terms of drainage curves, which plot the volume fraction of molten metal in the packed powder preform (also called saturation) versus the applied pressure. The shape of the curves confirms earlier findings, namely (i) the initial stage of infiltration is dominated by percolation and obeys a universal scaling relation while the metal shape is fractal and (ii) at higher saturation incremental pore-filling is dictated by local pore geometrical characteristics, saturation curves obeying then the Brooks-Corey correlation. According to sessile drop data in the literature, the Cu-Sn system is characterized by relatively small changes in the contact angle with alloy composition (128 to 122°), while the metal surface tension changes by more than a factor two over the whole composition range. One would therefore expect that the drainage curves be indifferently proportional to the molten metal surface tension or the work of immersion: the present data show that this is indeed verified.

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Surface Tension and its Temperature Coefficient of Liquid Sn-X (X=Ag, Cu) Alloys

Cited by 135 publications

References 48 publications

Identifying important structural characteristics of arsenic resistance proteins by using designed three-stranded coiled coils

Identifying important structural characteristics of arsenic resistance proteins by using designed three-stranded coiled coils

Cu–Ni nanoalloy phase diagram – Prediction and experiment

Infiltration of tin bronze into alumina particle beds: influence of alloy chemistry on drainage curves

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