Principal Investigator
Sindy K.Y. Tang, Ph.D.
Dept. of Mechanical Engineering
Stanford University


Micro-particle Image Velocimetry (uPIV) in Drops within a Concentrated Emulsion

This movie shows PIV in drops within a concentrated emulsion flowing in a microfluidic channel. For details, see our papers in Physics of Fluids.

Electric Drill as Centrifuge

This movie shows how to use an electric drill driver as centrifuge. For details, see our Chips & Tips.

Unexpectedly Ordered Droplet Motion

These movies show that droplet rearrangement "T1 events" or dislocation dynamics follow an expected order. For details, see our PNAS paper.

Droplet Breakup

These movies show the breakup of drops in a concentrated emulsion flow through a narrow constriction. For details, see Soft Matter, 10, 421-430, 2014.

Flow rates (from top to bottom): 0.5 mL/hr, 1.5 mL/hr, 2.5 mL/hr, 3.5 mL/hr. Constriction width and height = 30 um:
Flow rate: 0.2 mL/hr. Constriction width and height = 30 um:
Flow rate: 0.8 mL/hr. Constriction width and height = 30 um:
Flow rate: 0.8 mL/hr. Constriction width and height = 30 um:

Droplet Generation

This movie shows the alternate generation of two types of droplets in two T-junctions facing each other. These drops contain different laser dyes that emit different wavelengths when excited optically. The radius of the drops is about 20 micrometers. The video is > 100 times slower than real-time. Lab on a Chip, 9, 2767 - 2771, 2009.

Optofluidics: Liquid-Liquid Lens

This movie shows the real-time tuning of a microfluidic lens formed at the interface of two miscible liquids. As flow is turned on, the lens forms, and light is focused. When the flow stops, the lens disappears, and light becomes unfocused. Lab on a Chip, 8, 395–401, 2008

Optofluidics: Whispering Gallery Mode in Drops

This movie shows the whispering gallery modes (WGM) in an expanding drop. The bright rim at the equator of the drop is characteristic of WGMs.

Eggwhite Foams

These movies show the generation of air bubbles in an eggwhite solution in a microfluidic channel. Flow conditions control the volume fraction of air to solution. It in turn controls the self-assembly, internal structure, and the rheology of the foam.

© 2018 Tang Group @ Stanford University. All rights reserved.