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Control over in-channel mesostructure orientation through AAM surface modification.

Avigail Keller1, Tamar Segal-Peretz, Yaron Kauffmann

  • 1Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Physical Chemistry Chemical Physics : PCCP
|July 10, 2013
PubMed
Summary
This summary is machine-generated.

Surface chemistry modifications of anodic alumina membranes (AAM) guide the self-assembly of silica mesostructures. This control over anion concentration enables the formation of desired vertically aligned hexagonal phases for advanced materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Mesoporous silica materials exhibit unique properties for applications in catalysis, separation, and drug delivery.
  • Controlling the structure and orientation of mesoporous materials is crucial for optimizing their performance.
  • Anodic alumina membranes (AAM) offer a template for synthesizing ordered nanostructures.

Purpose of the Study:

  • To investigate the influence of channel surface chemistry on the orientation of hexagonal mesoporous silica synthesized within AAM.
  • To establish a method for inducing desired mesostructure orientations through surface modification.
  • To develop a model explaining the role of surface anions in mesostructure formation.

Main Methods:

  • Sol-gel synthesis of mesoporous silica using a tetrahydrofuran (THF) based precursor.
  • Evaporation induced self-assembly (EISA) method within AAM channels.
  • Surface modification of AAM channels via oxygen plasma, atomic layer deposition (ALD) of alumina, and hydrophobic monolayer deposition.
  • Characterization using transmission electron microscopy (TEM) and energy filtered TEM (EFTEM).

Main Results:

  • Surface modifications alter anion concentration at the AAM channel walls.
  • High surface anion concentration promotes the formation of vertically aligned columnar hexagonal silica mesostructures.
  • The study successfully induced desired orientations by tailoring channel wall chemistry.

Conclusions:

  • Channel surface chemistry is a critical factor in directing the orientation of in-channel mesoporous silica.
  • Surface anion concentration plays a key role in the competition between phase transformation and silica condensation.
  • Judicious surface modification of AAM provides a pathway to control mesostructure orientation for tailored nanomaterials.