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  2. Washburn's equation - Wikipedia

    en.wikipedia.org/wiki/Washburn's_equation

    Washburn's equation is also used commonly to determine the contact angle of a liquid to a powder using a force tensiometer. [ 5 ] In the case of porous materials, many issues have been raised both about the physical meaning of the calculated pore radius r {\displaystyle r} [ 6 ] and the real possibility to use this equation for the calculation ...

  3. Contact angle - Wikipedia

    en.wikipedia.org/wiki/Contact_angle

    Static measurements yield values in-between the advancing and receding contact angle depending on deposition parameters (e.g. velocity, angle, and drop size) and drop history (e.g. evaporation from time of deposition). Contact angle hysteresis is defined as θ A – θ R although the term is also used to describe the expression cos θ R – cos ...

  4. Sessile drop technique - Wikipedia

    en.wikipedia.org/wiki/Sessile_drop_technique

    An alternative method for measuring the contact angle is the Wilhelmy method, which employs a sensitive force meter of some sort to measure a force that can be translated into a value of the contact angle. In this method, a small plate-shaped sample of the solid in question, attached to the arm of a force meter, is vertically dipped into a pool ...

  5. Goniometer - Wikipedia

    en.wikipedia.org/wiki/Goniometer

    In surface science, an instrument called a contact angle goniometer or tensiometer measures the static contact angle, advancing and receding contact angles, and sometimes surface tension. The first contact angle goniometer was designed by William Zisman of the United States Naval Research Laboratory in Washington, D.C. and manufactured by ramé ...

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  7. Captive bubble method - Wikipedia

    en.wikipedia.org/wiki/Captive_bubble_method

    The captive bubble method is a method for measuring the contact angle between a liquid and a solid, by using drop shape analysis. [1] In this method, a bubble of air is injected beneath a solid, the surface of which is located in the liquid, instead of placing a drop on the solid as in the case of the sessile drop technique.

  8. 11 Expert-Backed Tips For Stopping a Receding Hairline - AOL

    www.aol.com/11-expert-backed-tips-stopping...

    11 Receding Hairline Treatments. Seeing your hairline start to creep up your scalp can be a stressful experience. Luckily, plenty of proven treatments are available to help stop your hairline from ...

  9. College Student Speaks Out After AI Chatbot Allegedly Told ...

    www.aol.com/lifestyle/college-student-speaks-ai...

    A Michigan college student said he recently received a message from an AI chatbot telling him to “please die." The experience freaked him out, and now he's calling for accountability.

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