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PDF Play:block;margin-top:24px;margin-bottom:2px;\ class=\tit nanoqamcaContact Angle and Surface Tension Measurement

horizontal atthepoint of contact [33] The inclinedangle ofthe plate is equal tothecontactangle Themethod ofusing asessile orpendantdropdescribed above can be applied to the measurement of the contact angle since the geometrical shape is also dependent on the contact angle as a boundary condition on the solid surface [34]

PDF Surface Tension of Polymers

Energy shortfall for a molecule sitting at the surface ~ U/2 is the size of a molecule; a2 is the exposed area of a molecule γ ≅ U Surface tension is then of order For van der Waals type interactions U ≅ kT 2 a 2 At a temperature of 25 oC kT is equal to 1/40 eV which gives γ = 20 mJ /m2 (close to actual value for oils and alcohols)

PDF Tutorial on Hertz Contact Stress

This tutorial provides a brief introduction to the Hertzian contact stress theory five types of the classical solutions for non-adhesive elastic contact are illustrated and the applications of the Hertz contact stress theory on optomechanical engineering are also addressed

  • How do you measure surface tension and contact angle?

    This is a technique that can be used for both surface/interfacial tension and contact angle measurements (Fig. 7b ). To measure the surface tension, a plate with known perimeter P is attached to a balance. The plate is brought into contact with the test liquid and the force due to wetting is measured.

  • What is the difference between contact angle and tangential tension?

    The contact angle is a material constant which depends on the properties of all three materials coming together. Whereas material adhesion can maintain a tension normal to the solid wall, the tangential tension has to vanish at the contact line, or it will start to move.

  • What is a high contact angle in superhydrophobic surfaces?

    Water droplets easily roll off such surfaces at a small sliding angle and hereby remove contaminants from the surface. The high contact angle in superhydrophobic surfaces is often called the apparent contact angle since it does not represent the actual contact angle value of the droplet on a flat surface.

  • What if contact angle is less than 90°?

    The contact angle for water in a glass tube is less than 90° (wetting the wall) and is more than 90° for mercury in a glass tube. In general, a nonwettable surface where the contact angle is greater than 90° is termed hydrophobic. Conversely, a contact angle less than 90° characterizes a wettable or hydrophilic surface.

  • C'est quoi une tension de contact ?

    ? La tension de contact est celle qui se produit si une personne touche le conducteur de descente alors que le courant de la foudre y circule. Dans les deux cas, le courant de la foudre traversera le corps de la personne avec le risque correspondant de dommages par choc électrique.
  • Quels sont les différents régimes de neutre ?

    Les 3 types de schémas de liaison à la terre

    TT (mise à la terre du neutre, et mise à la terre des masses métalliques)TN (mise à la terre du neutre, mise au neutre des masses métalliques)IT (neutre impédant ou isolé de la terre, mise à la terre des masses métalliques)
  • Pourquoi protéger le neutre ?

    Le schéma IT, aussi appelé régime de neutre IT permet de garantir la continuité d'alimentation, même lorsqu'un premier défaut d'isolement apparaît tout en limitant les risques pour vos équipes.
  • En présence d'un premier défaut d'isolement, l'installation peut fonctionner sans danger pour les personnes et les équipements. Il n'y a donc pas de déclenchement des protections.
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