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Related Experiment Videos

Interaction forces between talc and pitch probed by atomic force microscopy.

Viveca Wallqvist1, Per M Claesson, Agne Swerin

  • 1YKI, Ytkemiska Institutet AB/Institute for Surface Chemistry, Box 5607, SE-114 86 Stockholm, Sweden. viveca.wallqvist@surfshemkth.se

Langmuir : the ACS Journal of Surfaces and Colloids
|March 14, 2007
PubMed
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Controlling wood resin (pitch) deposits in paper machines requires understanding pitch interactions. This study reveals attractive forces between pitch and talc, mediated by air bubbles, aiding pitch control strategies.

Area of Science:

  • Wood Chemistry
  • Colloid Science
  • Surface Science

Background:

  • Pitch, composed of colloidal wood resin components in pulp, causes significant issues in paper machines.
  • Effective pitch control necessitates a deeper understanding of pitch-pitch and pitch-material interactions.
  • Current methods require improved understanding to develop more efficient pitch control systems.

Purpose of the Study:

  • To investigate the interactions between pitch and talc, a common pitch control additive.
  • To prepare well-defined pitch particles for atomic force microscopy (AFM) studies.
  • To elucidate the mechanisms behind pitch-talc interactions.

Main Methods:

  • Preparation of geometrically defined model pitch particles (abietic acid, collophonium, real pitch) on AFM tips.

Related Experiment Videos

  • Utilizing atomic force microscopy to measure forces between pitch particles and talc surfaces.
  • Analysis of interaction forces at varying separation distances.

    • Main Results:

    • Attractive forces were observed between pitch and talc particles.
    • These attractive forces were found to extend over large distances once initial contact was made.
    • Evidence suggests that bridging air bubbles or cavities are responsible for the observed attraction.

    Conclusions:

    • The study provides fundamental insights into pitch-talc interactions relevant to paper manufacturing.
    • The attractive forces identified, mediated by air bubbles, offer a mechanism for talc's effectiveness in pitch control.
    • Further research can leverage these findings to optimize industrial pitch management strategies.