Three-dimensional morphological chirality induction using high magnetic fields in membrane tubes prepared by a silicate garden reaction.

The journal of physical chemistry. B · 2005 · Mixed · Insufficient evidence

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MixedInsufficient evidencePaper 3565

Study snapshot

PublicationThe journal of physical chemistry. B · 2005

Study typeother

Reported directionMixed

Evidence ratingInsufficient

Abstract

Using a vertical superconducting magnet (max. 15 T), we studied magnetic field effects on membrane tube morphology prepared by a silicate garden reaction. At zero field, semipermeable membrane tubes grew upward when metal salts were added to a sodium silicate aqueous solution. In the presence of a magnetic field (15 T, downward) right-handed helical membrane tubes grew along a glass vessel's inner surface when magnesium chloride and copper sulfate were added. Referring to membrane tubes by the names of metal cations used in their preparation, in the case of Mg(II) and Zn(II) membrane tubes, the left-handed helical tubes grew when the field direction was reversed upward. The left-handed helical Mg(II) membrane tubes grew in the magnetic field when a glass rod was placed in a vessel. Mg(II) and Zn(II) tubes, separate from a vessel wall, grew in a twisted shape in the magnetic field. In situ observation of the solution's motion during the reaction revealed that the Lorentz force on the outflow from the opened top of the hollow membrane tube induced convection of the solution near the tube exit, engendering chiral growth of the membrane tubes. Relative orientation of the outflow and a boundary (a vessel wall or glass rod surface) helped to determine the convection's direction.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Using a vertical superconducting magnet (maximum 15 T), membrane tubes formed by a silicate garden reaction showed chiral (helical) growth in a magnetic field. With a 15 T downward field, right-handed helical tubes grew along the inner surface of a glass vessel for conditions including magnesium chloride and copper sulfate; for Mg(II) and Zn(II) tubes, reversing the field direction upward produced left-handed helical tubes. In situ observations suggested Lorentz-force-driven convection near the tube exit contributed to chiral growth, with boundaries (vessel wall or glass rod) influencing convection direction.

Outcomes measured

Membrane tube morphology
Helical chirality (right-handed vs left-handed growth)
Solution convection patterns during reaction

Limitations

No sample size reported in abstract
Exposure duration not reported
Study is on chemical/physical membrane tube formation rather than biological/health outcomes
Field conditions beyond 15 T and other parameters (e.g., gradients) not described in abstract

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "superconducting magnet",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Membrane tube morphology",
    "Helical chirality (right-handed vs left-handed growth)",
    "Solution convection patterns during reaction"
  ],
  "main_findings": "Using a vertical superconducting magnet (maximum 15 T), membrane tubes formed by a silicate garden reaction showed chiral (helical) growth in a magnetic field. With a 15 T downward field, right-handed helical tubes grew along the inner surface of a glass vessel for conditions including magnesium chloride and copper sulfate; for Mg(II) and Zn(II) tubes, reversing the field direction upward produced left-handed helical tubes. In situ observations suggested Lorentz-force-driven convection near the tube exit contributed to chiral growth, with boundaries (vessel wall or glass rod) influencing convection direction.",
  "effect_direction": "mixed",
  "limitations": [
    "No sample size reported in abstract",
    "Exposure duration not reported",
    "Study is on chemical/physical membrane tube formation rather than biological/health outcomes",
    "Field conditions beyond 15 T and other parameters (e.g., gradients) not described in abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "high magnetic field",
    "superconducting magnet",
    "15 T",
    "silicate garden reaction",
    "membrane tubes",
    "chirality",
    "helical growth",
    "Lorentz force",
    "convection"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1021/jp050469m
PubMed: 16852682

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