Bubble guidance of tubular growth in reaction-precipitation systems.

  title={Bubble guidance of tubular growth in reaction-precipitation systems.},
  author={Stephanie Thouvenel-Romans and Jason J. Pagano and O. Steinbock},
  journal={Physical chemistry chemical physics : PCCP},
  volume={7 13},
Numerous types of reaction-precipitation systems involve the growth of tubular structures similar to those formed in "silica gardens". As a model case for this phenomenon, we investigate the rapid growth of hollow tubes in the reaction between sodium silicate and cupric sulfate. The latter solution is injected hydrodynamically at constant flow rates of 1-20 mL h(-1) into a large reservoir of waterglass. In this study, the growth is templated and guided by single, buoyant gas bubbles. The… Expand
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Recent advances in inorganic precipitation reactions, known to self-organize a variety of macroscopic structures, including hollow tubes, are discussed with an emphasis on experiments similar to ‘silica gardens’. Expand
Synthesis of Inorganic Tubes under Actively Controlled Growth Velocities and Injection Rates
We describe an experiment that establishes control over the growth velocities of macroscopic tubes in the reaction between a polymerizable inorganic anion and a nonalkali metal ion. Our approach isExpand
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Abstract Using reaction conditions far from equilibrium, we are able to produce hollow tubes formed from reactant-loaded pellets. The latter pellets are composed of zinc sulfate and phosphorescentExpand
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The experiments reveal a distinct, concentration-dependent transition from convective plumes of reaction-induced, colloidal particles to mechanically connected, hollow tubes, which are similar to that of laminar starting plumes in nonreactive systems. Expand
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The synthesis of similar tubes using a flow injection method with gas bubbles as directional guides and templates is presented, consisting of silica-supported zinc oxide nanostructures and show interesting luminescence and photocatalytic properties. Expand
Tube Formation in Reverse Silica Gardens
The flow injection of sodium silicate solution into a large reservoir of lighter cupric sulfate solution creates single, downward growing precipitation tubes. These hollow structures have diametersExpand
Spatially resolved analysis of calcium–silica tubes in reverse chemical gardens
Abstract Reverse chemical gardens consist of hollow tubular structures that form in a downward direction from a mechanically held silicate crystal immersed in a metal salt solution. As a model caseExpand
Osmotic contribution to the flow-driven tube formation of copper-phosphate and copper-silicate chemical gardens.
It is shown that the ratio of the volume increase rate to that of pumping is constant independent of the chemical composition, and it is found that osmosis significantly contributes to the tube growth. Expand
The dynamics of open precipitation tubes.
Measurements of the radius, length, and internal pressure, as functions of time and flow rate, for precipitation tubes growing in chemical gardens are reported and models for how single tubes grow and also for how multiple tubes interact with each other are developed. Expand
Compositional analysis of copper-silica precipitation tubes.
This work investigates the structure and elemental composition of hollow tubular structures that form from salt crystals seeded into silicate solution in silica gardens in the context of a recently developed experimental model that allows quantitative analyses based on predetermined reactant concentrations and flow rates. Expand


Tubular precipitation and redox gradients on a bubbling template.
  • David A. Stone, R. Goldstein
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences of the United States of America
  • 2004
This work reports a self-organized periodic templating mechanism producing tubular structures electrochemically in iron-ammonium-sulfate solutions; iron oxides precipitate on the surface of bubbles that linger at the tube rim and then detach, leaving behind a ring of material. Expand
Silica tubes in chemical gardens: Radius selection and its hydrodynamic origin
Chemical gardens consist of hollow silica fibers that form from silicate solution upon seeding with salt crystals or injection of salt solution. We investigate the outer radius of these tubes forExpand
Oscillatory growth of silica tubes in chemical gardens.
Two distinct growth regimes of hollow silica fibers formed by hydrodynamic injection of cupric sulfate into silicate solution are reported, applicable to the understanding of chemical gardens, promise a wealth of nonlinear phenomena, and offer possible applications in microfluidics. Expand
The hydration of Portland cement
Electron microscopy and conduction calorimetry have been employed to study the hydration of Portland cement. In situ studies of wet cement pastes in an environmental cell in the high voltageExpand
Studies of the growth of “silicate gardens” and related phenomena
Various growth morphologies obtained in “silicate gardens” are described and the influence of salt type and silicate concentration are examined. It is demonstrated that these growths develop by anExpand
Stalactite growth as a free-boundary problem: a geometric law and its platonic ideal.
The interplay of thin-film fluid dynamics, calcium carbonate chemistry, and CO2 transport in the cave is considered to show that stalactites evolve according to a novel local geometric growth law which exhibits extreme amplification at the tip as a consequence of the locally-varying fluid layer thickness. Expand
The “silica garden’' as a Brønsted acid catalyst
The “silica garden’', an amorphous aluminosilicate produced from a solution of sodium silicate seeded with crystalline aluminium nitrate, has been examined by FTIR, TGA, solid-state NMR and catalyticExpand
Characterization of Hollow Chemical Garden Fibers from Metal Salts and Water Glass
Hollow fibers formed from water glass and metal salts of IIA(Ca), VIIB(Fe, Co, Ni) and IB(Cu) groups were characterised in this study. Fragile fibres obtained herein broke down into small piecesExpand
Self-Assembled Silica-Carbonate Structures and Detection of Ancient Microfossils
Inorganic micron-sized filaments, whose microstucture consists of silica-coated nanometer-sized carbonate crystals, arranged with strong orientational order, are synthesized, demonstrating that abiotic and morphologically complex microstructures that are identical to currently accepted biogenic materials can be synthesized inorganically. Expand
Formation of Chemical Gardens
Abstract Chemical gardens are the plant-like structures formed upon placing together a soluble metal salt, often in the form of a seed crystal, and an aqueous solution of one of many anions, oftenExpand