Oil and water are famously reluctant to mix fully together. But separating them completely—for example, when cleaning up after an oil spill or purifying water contaminated through fracking—is a devilishly hard and inefficient process frequently dependent on membranes that tend to get clogged up, or “fouled.”
A new imaging technique, developed by MIT graduate students Yi-Min Lin and Chen Song and professor of chemical engineering Gregory Rutledge and described in the journal Applied Materials and Interfaces, could provide a tool for developing better membrane materials that can resist or prevent fouling.
The fouling process is very hard to observe, making it difficult to assess the relative advantages of different membrane materials and architectures. The new technique could make such evaluations much easier to carry out, the researchers say.
Using two dyes that fluoresce at different wavelengths, the researchers labeled the fibers of the membrane with one and the oily material in the fluid with the other. Then, employing confocal laser scanning microscopy, they used two lasers—one to illuminate each dye—and controlled the position and depth of the lasers’ focus to collect stacks of 2D images at different depths. Their technique can build up a full 3D image showing the oil, fiber, or both, making it possible to see how the oil droplets are dispersed in the membrane.
Doing so, and testing the effects using different materials and different arrangements of the fibers, “should give us a better understanding of what fouling really is,” Rutledge says.
The dark secret behind those cute AI-generated animal images
Google Brain has revealed its own image-making AI, called Imagen. But don't expect to see anything that isn't wholesome.
Inside Charm Industrial’s big bet on corn stalks for carbon removal
The startup used plant matter and bio-oil to sequester thousands of tons of carbon. The question now is how reliable, scalable, and economical this approach will prove.
The hype around DeepMind’s new AI model misses what’s actually cool about it
Some worry that the chatter about these tools is doing the whole field a disservice.
How Charm Industrial hopes to use crops to cut steel emissions
The startup believes its bio-oil, once converted into syngas, could help clean up the dirtiest industrial sector.
Get the latest updates from
MIT Technology Review
Discover special offers, top stories, upcoming events, and more.