When it comes to 3D printing, the sky is the limit. As 3D printing technology continues to advance, applications can be as far reaching as airplane and automobile parts to medical devices and even anatomically correct, biocompatible models. Although 3D printing technology is developing at a rapid pace, the technology itself is not new. It emerged in the 1980s as a means of creating rapid prototypes. In recent years the applications for 3D printed models have evolved with the available hardware, software, and printable materials. Evolving technology, paired with the creative and innovative minds of scientists, engineers, and physicians, has been the launching pad for developments within 3D printing technology specific to healthcare. One way 3D printing technology is poised to create better patient outcomes is in creating an anatomically and patient-specific models to aid in surgery and medical procedures. With the capability to 3D ...
Imagine working in an ultra-modern building like this one in Malaysia, next to a glass wall equipped with smart curtains that keep your workspace comfortably lit. This soon could be a reality.
A reversible photoactuator, a device that moves in response to light, has been created using polymer film and carbon nanotube bilayers. Carbon nanotubes have been used in actuators since 1999 due to their excellent heat and electrical conductivity. In this new application, the nanotubes create the movement in response to light, unlike polymer photo actuators that rely on photosensitive polymers.
A team of researchers from Lawrence Berkeley National Laboratory at the University of California, Berkeley, and Northwestern University in Evanston, Ill., has created smart curtains based on polymer and single-walled carbon nanotube bilayers. They offer fast (under 1 second), reversible actuation and wavelength-selective response. Light-responsive smart curtains potentially have many applications in modern architecture, maintaining energy and light efficiency. Here is how Sarah Yang describes it at UC Berkeley News Center:
A research team led by Ali Javey, associate professor of electrical engineering and computer sciences, layered carbon nanotubes — atom-thick rolls of carbon — onto a plastic polycarbonatecurtains membrane to create a material that moves quickly in response to light. Within fractions of a second, the nanotubes absorb light, convert it into heat and transfer the heat to the polycarbonate membrane’s surface. The plastic expands in response to the heat, while the nanotube layer does not, causing the two-layered material to bend.
Two types of film actuators, with the opposite reaction to a light-darkness cycle. The movement of the bilayer films, created by the difference in the thermal properties of the polymer film and nanotubes, was highly reproducible even after 60,000 cycles. Published in Nature Communications, the work also describes a light-driven resonator, motor and oscillator, further advancing the exciting field of photoactuators:
Another exciting “smart” development in this group is a flexible user-interactive sensor network, or electronic skin, which responds to touch by lighting up. Smart indeed!Previously explored materials and structures do not simultaneously offer fast and wavelength-selective response, reversible actuation, low-cost fabrication and large deflection. Here, we demonstrate highly versatile photoactuators, oscillators and motors based on polymer/single-walled carbon nanotube bilayers that meet all the above requirements.
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