Rutgers Pioneering 4D Printed Controllable Hydrogel

FrgMstr

Just Plain Mean
Staff member
Joined
May 18, 1997
Messages
50,360
While on the face of it, Rutgers' "4D printing" may not seem like that big of a deal, but this type of technology could pave the way for manufacturing "living" structures in human organs and tissues, soft robots, and targeted drug delivery. If you would like some experience with a non-4D printed hydrogel, you have to look no further than than Jello snack pack in your refrigerator.

Check out the video.

The engineers learned how to precisely control hydrogel growth and shrinkage. In temperatures below 32 degrees Celsius (about 90 degrees Fahrenheit), the hydrogel absorbs more water and swells in size. When temperatures exceed 32 degrees Celsius, the hydrogel begins to expel water and shrinks. The objects they can create with the hydrogel range from the width of a human hair to several millimeters long. The engineers also found that they can grow one area of a 3D-printed object – creating and programming motion – by changing temperatures.

The smart gel could provide structural rigidity in organs such as the lungs, and can contain small molecules like water or drugs to be transported in the body and released. It could also create a new area of soft robotics, and enable new applications in flexible sensors and actuators, biomedical devices and platforms or scaffolds for cells to grow, Lee said.
 

sfsuphysics

I don't get it
Joined
Jan 14, 2007
Messages
14,188
The 4D printing approach here involves printing a 3D object with a hydrogel (water-containing gel) that changes shape over time when temperatures change
So does it have memory capabilities so that it can go back to the original form when the temperature goes back? Or is it kind of like a wax, where it changes shape as the temperature rises?
 

WhoMe

Gawd
Joined
Jan 3, 2018
Messages
827
A hydrogel is a network of polymer chains that are hydrophilic, sometimes found as a colloidal gel in which water is the dispersion medium. Dang where is my chem 101 text book? Seriously interesting. Had to look up 4D printing though.

Bonus cookie to anyone who gets this reference: "What's so far fetched about a government under control of a giant alien jelly?" No cookie if you had to Sari/Alexa/google/duckduckgo to find out.
 

Khahhblaab

Limp Gawd
Joined
Apr 23, 2017
Messages
481
Bonus cookie to anyone who gets this reference: "What's so far fetched about a government under control of a giant alien jelly?" No cookie if you had to Sari/Alexa/google/duckduckgo to find out.
The Blob? Nah!

Monsters vs Aliens? Nah!

Hmmm?

Guess I gotta buy my own cookies ...............after I buy some healthy dried apricots snacks first :)
 

WhoMe

Gawd
Joined
Jan 3, 2018
Messages
827
The Blob? Nah!

Monsters vs Aliens? Nah!

Hmmm?

Guess I gotta buy my own cookies ...............after I buy some healthy dried apricots snacks first :)
Nope, not scifi, but good guesses. Britcom. It's pretty obscure: Are You Being Served? Said by Mr. Spooner in "Calling All Customers." But I'll FAX you a nice consolation cookie for trying :). And don't ask me why this story tripped that memory.
 

Khahhblaab

Limp Gawd
Joined
Apr 23, 2017
Messages
481
Nope, not scifi, but good guesses. Britcom. It's pretty obscure: Are You Being Served? Said by Mr. Spooner in "Calling All Customers." But I'll FAX you a nice consolation cookie for trying :). And don't ask me why this story tripped that memory.
thanx..............(now, where did I put that fax machine at ????)
 
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