Discrimination between the permeation of H+ and OH− ions in precipitation membranes

Bahr, G. F.; Ayalon, Amram; Rompf, Fritz Dieter; Hirsch-Ayalon, P.

doi:10.1016/s0376-7388(00)80726-7

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…More specifically, the trans‐membrane mass exchange is allowing the slow transport of the anions while effectively blocking the metal cations. This phenomenon was also observed by Bahr et al . in an electrochemical study of BaSO 4 precipitate membranes, which showed a 4–5 times higher permeation of OH − ions than H + ions.…”

Section: Making Mineral Membranes In Microfluidic Devicessupporting

confidence: 81%

Materials Synthesis and Catalysis in Microfluidic Devices: Prebiotic Chemistry in Mineral Membranes

Wang

Steinbock

2019

ChemCatChem

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The processes that led to the origins of life possibly occurred in the inorganic precipitate membranes of alkaline hydrothermal vents. These geochemical systems provide spatial confinement, cross‐membrane gradients, and catalytic surfaces. The experimental exploration of catalysis in these materials is challenging due to the vastness of the underlying parameter space and the need to maintain nonequilibrium conditions for long times. Microfluidic approaches offer an efficient solution to some of these problems by allowing the formation of mineral membranes at the interface of flowing reactant solutions and the control of steep gradients. In this minireview, we summarize recent progress in the production of mineral membranes using laminar microfluidic devices and discuss their catalytic properties in the context of prebiotic chemistry. Examples of catalytic reactions include the formation of pyrophosphate, peptides, and thioesters in precipitates containing iron, nickel, and calcium.

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Section: Making Mineral Membranes In Microfluidic Devicessupporting

confidence: 81%

Materials Synthesis and Catalysis in Microfluidic Devices: Prebiotic Chemistry in Mineral Membranes

Wang

Steinbock

2019

ChemCatChem

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“…Furthermore, it should be possible to create a multitude of different physical and chemical gradients simply by replacing the interior and exterior solutions. Whatever their nature and origin, these gradients will be steepest within the micrometre-sized tube wall, which in itself is a porous matrix that allows (slow) diffusion but prevents fluid flow [59,61,62]. These should be ideal conditions for carrying out numerous reactions, including convective polymerase chain reactions, Soret processes and possibly electrochemically driven energy production [63,64].…”

Section: Discussionmentioning

confidence: 99%

Tubular precipitation structures: materials synthesis under non-equilibrium conditions

Makki

Roszol

Pagano

et al. 2012

Phil. Trans. R. Soc. A.

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Inorganic precipitation reactions are known to self-organize a variety of macroscopic structures, including hollow tubes. We discuss recent advances in this field with an emphasis on experiments similar to 'silica gardens'. These reactions involve metal salts and sodium silicate solution. Reactions triggered from reagent-loaded microbeads can produce tubes with inner radii of down to 3 mm. Distinct wall morphologies are reported. For pump-driven injection, three qualitatively different growth regimes exist. In one of these regimes, tubes assemble around a buoyant jet of reactant solution, which allows the quantitative prediction of the tube radius. Additional topics include relaxation oscillations and the templating of tube growth with pinned gas bubble and mechanical devices. The tube materials and their nano-to-micro architectures are discussed for the cases of silica/Cu(OH) 2 and silica/Zn(OH) 2 /ZnO tubes. The latter case shows photocatalytic activity and photoluminescence.

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“…As is well known, precipitate structures-produced where a solution containing an acidic salt of a metal precipitates upon interaction of a dissolved solute in an alkaline aqueous phase-comprise semipermeable osmotic membranes [6,7,[66][67][68]. Such membranes are known to act as selective diffusion barriers across which an electrical potential occurs with the separation of ionic species, and exhibit ionic diffusion with an applied potential [67].…”

Section: Discussion and Prospectusmentioning

confidence: 99%

“…Such membranes are known to act as selective diffusion barriers across which an electrical potential occurs with the separation of ionic species, and exhibit ionic diffusion with an applied potential [67]. In the cases of BaSO 4 and calcium oxalate membranes, OH − permeation was found to exceed H + permeation by four-or fivefold [68] and may be thought of as capacitors insofar as they maintain charge separation. A similar situation may be involved in the FeS structures presented here, and demonstration of this is a challenge for future experimentation.…”

Section: Discussion and Prospectusmentioning

confidence: 99%

Peptide and RNA contributions to iron–sulphur chemical gardens as life's first inorganic compartments, catalysts, capacitors and condensers

McGlynn

Kanik

Russell

2012

Phil. Trans. R. Soc. A.

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Hydrothermal chimneys and compartments comprising transition metal sulphides and associated minerals have been proposed as likely locations for the beginnings of life. In laboratory simulations of off-axis alkaline springs, it is shown that the interaction of a simulated alkaline sulphide-bearing submarine vent solution with a primeval anoxic iron-bearing ocean leads to the formation of chimney structures reminiscent of chemical gardens. These chimneys display periodicity in their deposition and exhibit diverse morphologies and mineralogies, affording the possibilities of catalysis and molecular sequestration. The addition of peptides and RNA to the alkaline solution modifies the elemental stoichiometry of the chimneys-perhaps indicating the very initial stage of the organic takeover on the way to living cells by charged organic polymers potentially synthesized in this same environment.

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Discrimination between the permeation of H+ and OH− ions in precipitation membranes

Cited by 12 publications

References 10 publications

Materials Synthesis and Catalysis in Microfluidic Devices: Prebiotic Chemistry in Mineral Membranes

Materials Synthesis and Catalysis in Microfluidic Devices: Prebiotic Chemistry in Mineral Membranes

Tubular precipitation structures: materials synthesis under non-equilibrium conditions

Peptide and RNA contributions to iron–sulphur chemical gardens as life's first inorganic compartments, catalysts, capacitors and condensers

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