Adsorption of Amino Acids and Glutamic Acid-Based Surfactants on Imogolite Clays

Bonini, Massimo; Gabbani, Alessio; Buffa, Stefano Del; Ridi, Francesca; Bordes, Romain; Holmberg, Krister

doi:10.1021/acs.langmuir.6b04414

Cited by 20 publications

(16 citation statements)

References 56 publications

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“…INTs can thus be rendered amphiphilic by replacing their inner silanol or germanol moiety by a functionalized one, 15 or by grafting molecular compounds on the outer aluminum wall. [15][16][17][18] Whatever the nature (SW or DW) or the nanotube nominal composition (OH) 3 Bundling is analyzed thanks to X-ray scattering (XRS) experiments. Our experiments and their analysis allow us to propose the first phase diagram for the bundle assembling of metal-oxide imogolite nanotubes.…”

Section: +mentioning

confidence: 99%

Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes

et al. 2017

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Significant developments have been proposed over the past decade in the synthesis of aluminosilicate and aluminogermanate imogolite-like nanotubes. But, while liquid phase synthesis is well-controlled, it is not the case for the nanotube arrangement in the dry state. In particular, nanotubes are found to self-assemble in bundles of various sizes, which may impact the properties of the final product. Here, we investigate the effect of ionic strength on bundling of aluminogermanate single-walled imogolite nanotubes (Ge-SWINT) in aqueous suspensions and in the resulting powders after solvent evaporation. The nanotube arrangement as a function of salt concentration was studied by X-ray scattering experiments and simulations. In aqueous suspension, nanotubes bundling occurs only at high ionic strength (IS > 8 × 10–2 mol·L–1), while beyond this threshold, the increase of electrostatic repulsions induces a complete stabilization of individual nanotubes. After solvent evaporation, nanotube arrangement is shown to be dictated principally by the initial concentration of salt. Beyond an ionic strength of ∼10–3 mol·L–1 in the starting suspension, all Ge-SWINT samples tend to form large bundles in powder, whose lattice parameters are independent of the initial salt concentrations. These experimental results clearly show that the positive surface charge of imogolite can be used to control nanotubes bundling by anion condensation.

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Section: +mentioning

confidence: 99%

Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes

et al. 2017

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“…Their nanometric diameter is tunable at the Angstrom level, depending on the nature of synthesis precursors 22 , 26 , 27 . Moreover, various surface functionalizations have been achieved, either by modification of their inner surface with organic moieties 5 , 21 , 22 or by grafting organic compounds on the outer part of the nanotube 28 , 29 . The chemical versatility of INT paves the way towards possible applications in various fields, such as stimuli-responsive materials 20 , molecular storage 21 , 30 , molecular recognition and separation 5 , 31 , water filtration and decontamination 22 , 32 as well as catalysis 33 and photocatalysis 34 .…”

Section: Introductionmentioning

confidence: 99%

Structural resolution of inorganic nanotubes with complex stoichiometry

et al. 2018

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Determination of the atomic structure of inorganic single-walled nanotubes with complex stoichiometry remains elusive due to the too many atomic coordinates to be fitted with respect to X-ray diffractograms inherently exhibiting rather broad features. Here we introduce a methodology to reduce the number of fitted variables and enable resolution of the atomic structure for inorganic nanotubes with complex stoichiometry. We apply it to recently synthesized methylated aluminosilicate and aluminogermanate imogolite nanotubes of nominal composition (OH)3Al2O3Si(Ge)CH3. Fitting of X-ray scattering diagrams, supported by Density Functional Theory simulations, reveals an unexpected rolling mode for these systems. The transferability of the approach opens up for improved understanding of structure–property relationships of inorganic nanotubes to the benefit of fundamental and applicative research in these systems.

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“…Life on the Earth can date back as early as 4.10 to 4.28 Ga ago, and there is strong evidence that minerals played a central role during the chemical evolution of early life . Amino acids are the building block of peptides and proteins, and adsorption has been regarded as the first and key step for amino acids to react over mineral surfaces . A variety of minerals has been detected on the Earth's crust, and different minerals may have distinct surface structures, adsorption, and catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Amino acids are the building block of peptides and proteins, and adsorption has been regarded as the first and key step for amino acids to react over mineral surfaces. [4][5][6][7] A variety of minerals has been detected on the Earth's crust, and different minerals may have distinct surface structures, adsorption, and catalytic properties. A number of critical issues regarding adsorption and catalytic conversions of amino acids over mineral surfaces currently remain elusive.…”

Section: Introductionmentioning

confidence: 99%

Toward the origin of life over feldspar surfaces: Adsorption of amino acids and catalysis of conformational interconversions

Yun

Yang

2020

Int J of Quantum Chemistry

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Feldspars are a group of tectosilicate minerals terminated with a full layer of hydroxyl groups and have been regarded as “hotbed” for birth of life. In this study, periodic density functional theory calculations are conducted to address two associated issues, as adsorption of amino acids and conformational interconversions over feldspar surfaces. Distribution of glycine isomers depends strongly on the number of interacted surface silanols (n), and canonical isomers exist exclusively for n ≤ 2 while zwitterions predominate for n = 3. Adsorption of amino acids is significantly affected by sidechains, especially those forming H‐bonds with surfaces; however, sidechain contacts with feldspar surfaces disfavor zwitterion stabilization, and zwitterions become preferred without sidechain contacts. For all amino acids, conformational interconversions undergo four elementary steps, and proton transfer between two carboxylic‐O atoms (step 2) is always rate‐decisive. Step 2 is greatly accelerated with catalysis of surface silanols and activation barriers depend significantly on sidechains. All amino acids have moderate activation barriers and conformational interconversions (in both forward and reverse directions) proceed favorably at ambient conditions. Sidechains of amino acids exhibit influences through sidechain contacts with surfaces rather than as substituent effect.

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Adsorption of Amino Acids and Glutamic Acid-Based Surfactants on Imogolite Clays

Cited by 20 publications

References 56 publications

Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes

Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes

Structural resolution of inorganic nanotubes with complex stoichiometry

Toward the origin of life over feldspar surfaces: Adsorption of amino acids and catalysis of conformational interconversions

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