Related Experiment Video
Updated: Jan 24, 2026
12:55
Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems
Published on: November 18, 2015
14.9K
Differing growth dynamics in seed-grown planar vertical chemical gardens
Mingchuan Zheng1,2, Emmanuelle Dumont1, Romero D Featherstone1
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, UK. afr10@cam.ac.uk.
Soft Matter
|January 23, 2026
Summary
Chemical gardens, lab models for hydrothermal vents, show anisotropic growth influenced by diffusion. Upward tubular growth correlates with increased internal pressure, offering insights into vent formation.
Area of Science:
- Materials Science
- Geochemistry
- Chemical Engineering
Background:
- Chemical gardens are self-assembled, semi-permeable precipitate structures.
- They serve as laboratory analogs for hydrothermal vents.
- Potential applications exist in functional chemobrionic materials.
Purpose of the Study:
- Investigate the behavior of chemical gardens grown from magnesium chloride seeds in sodium silicate solutions.
- Analyze the anisotropic growth patterns and pressure dynamics within the gardens.
- Explore the relationship between silicate concentration, growth morphology, and internal pressurization.
Main Methods:
- Utilized a vertical Hele-Shaw cell for controlled growth experiments.
- Grew chemical gardens using magnesium chloride seeds in sodium silicate solutions.
- Monitored radial growth and internal pressure changes over time.
Main Results:
- Observed non-isotropic radial growth, fastest at the bottom and slowest at the top.
- Modeled radial growth in each direction using a diffusion-controlled law.
- Identified an initial gradual pressure increase followed by rapid pressurization and plateau.
- Found upward tubular growth at higher silicate concentrations, correlating with rapid pressurization.
Conclusions:
- Chemical garden growth is diffusion-controlled and directionally dependent.
- Internal pressure dynamics are linked to specific growth morphologies like upward tubes.
- Findings may inform mechanisms of hydrothermal vent flange formation.
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