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Methods for Characterizing the Co-development of Biofilm and Habitat Heterogeneity
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Chemical Differences in Environmental Films Collected on Surfaces with Different Hydrophilicity.

Jessica L DeYoung1, Uchechukwu Grace Akporere1, Zezhen Cheng2

  • 1University of Iowa, Iowa City, Iowa state 52242, United States.

ACS Earth & Space Chemistry
|December 25, 2024
PubMed
Summary

Environmental films deposited on gold and silicon surfaces show distinct mass distribution and particle packing. Substrate properties significantly influence film formation, impacting surface coverage and particle density.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Surface Chemistry

Background:

  • Environmental films form from airborne particles and molecules adsorbing onto surfaces.
  • Previous research often neglects how collection methods and surface properties affect film deposition.

Purpose of the Study:

  • To investigate how different substrate materials (gold and silicon) influence the properties of deposited environmental films.
  • To understand the impact of surface characteristics on particle deposition and film morphology.

Main Methods:

  • Environmental films were collected on gold and silicon surfaces with varying water contact angles.
  • Characterization involved computer-controlled scanning electron microscopy (CCSEM) and energy-dispersive X-ray spectroscopy (EDX).
  • Particle packing and distribution were analyzed using nearest-neighbor distance calculations.

Main Results:

  • Gold surfaces exhibited homogeneous film mass distribution, while silicon surfaces showed irregular, patchy domains.
  • Significant differences in surface coverage and particle number density were observed between the two substrates.
  • Larger particles (>5 μm) had similar elemental compositions across both surfaces, with smaller particles showing variations, including carbon-rich biotic matter.

Conclusions:

  • Substrate properties critically alter environmental film formation, affecting morphology, coverage, and particle arrangement.
  • The study highlights the importance of considering host-surface characteristics in environmental film research.
  • Identified chemical components include nitrate, sulfate, and various cations, with biotic contributions from smaller particles.