Nano- and Microtechnology from A - Z: From Nanosystems to Colloids and Interfaces

W

Wagner Equation

An equation for predicting the conductivity of dispersions. See Table 19.

Walk-on-Water Demonstration

See Oobleck.

Wallaston Prism

See Differential Interference Contrast Microscopy.

Warren Spring Laboratory Rolling Flask Test

See Labofina Test.

Wasan, Darsh T. (1938–)

Indian-born American chemical and colloid and interface engineer. Known for work in particle science and technology, emulsions, foams, and thin films. Long-time editor of the Journal of Colloid and Interface Science.

Washburn Equation

An equation describing the extent of displacement of one fluid by another in a capillary tube or cylindrical pore in a porous medium. If h is the depth of penetration of invading fluid and dh/dt is the rate of penetration, then dh/dt = γr cos θ/(4 ηh), where γ is the interfacial tension, r is the capillary radius, θ is the contact angle, and η is the viscosity of the invading fluid. It is used in the evaluation of porosimetry data and can be used to provide information about contact angles, capillary radii, and pore radii, depending on the experiments conducted.

Washing De-Inking

See De-Inking.

Wash Load

See Suspended Load.

Water II

See Polywater.

Wavelength Dispersive X-ray Spectroscopy

(WDXS) See Energy-Dispersive X-ray Spectroscopy.

W/A/W

Water/air/water interface. See Anti-Bubbles.

WDXS

Wavelength Dispersive X-ray Spectroscopy. See Energy-Dispersive X-ray Spectroscopy.

Wearable Technology

See Smart Textiles.

Wenzel Regime

In wettability, ...