Nanotechnology

Hotspots tamed by BEAST: Secrets of mysterious metal hotspots uncovered by new single molecule imaging technique

01/19/11 Berkeley Lab — The secrets behind the mysterious nano-sized electromagnetic "hotspots" that appear on metal surfaces under a light are finally being revealed with the help of a BEAST. Using the Brownian Emitter Adsorption Super-resolution Technique (BEAST), "we were able to map the electromagnetic field profile within a single hotspot as small as 15 nanometers with an accuracy down to 1.2 nanometers, in just a few minutes," says Xiang Zhang, a principal investigator with Berkeley Lab's Materials Sciences Division and the Ernest S. Kuh Endowed Chaired Professor of Mechanical Engineering at UC Berkeley.

Ultrathin alternative to silicon for future electronics

11/24/10 US News & World Report — There's good news in the search for the next generation of semiconductors. Researchers at UC Berkeley have successfully created a nanoscale transistor with excellent electronic properties. Led by Berkeley Engineering professor Ali Javey, they have successfully integrated ultra-thin layers of the semiconductor indium arsenide onto a silicon substrate to create a nanoscale transistor that offers several advantages as an alternative to silicon including superior electron mobility and velocity, which makes it an outstanding candidate for future high-speed, low-power electronic devices.

She paints for power

10/05/10 — What will power our next-generation gizmos? The microdevices, nanodevices and picodevices of the future? Our prediction: the Christine Ho battery. As an MSE graduate student, Ho (B.S.'05, M.S.'07, Ph.D.'10 MSE) developed a novel microbattery technology that promises to not only power the smallest of smart devices but also accelerate a variety of energy applications, from better home energy monitoring systems to large-scale energy storage solutions for wind and solar farms.

Nanoscientist with big aspirations

08/09/10 — Artificial skin that bestows the sense of touch on prosthetic limbs. Nanochips that control the latest smart phones and devices. Sheets of low cost solar cells as easy to install as unrolling a carpet. All future scenarios, yes, but ones that EECS associate professor Ali Javey is working to realize in the next decade or so. Javey, a chemist by training, develops new electronic materials and methods of processing existing materials destined for future applications.

Nanosized light mill drives micro-sized disk

07/05/10 Berkeley Lab — Engineers at Lawrence Berkeley National Laboratory and the University of California Berkeley have created the first nanosized light mill motor whose rotational speed and direction can be controlled by tuning the frequency of the incident light waves. This new light mill opens the door to a broad range of valuable applications, including a new generation of nanoelectromechanical systems (NEMS), nanoscale solar light harvesters, and bots that can perform in vivo manipulations of DNA and other biological molecules.

Engineering health reform

04/07/10 — The health care reform bill enacted last month is the most far-reaching domestic policy the nation has seen in decades. Only time will tell us all the ramifications of this historic legislation. As the acting dean of the College of Engineering I ask, how can engineers help patients, physicians and providers make the best use of the changes ahead?

Grigoropoulos awarded continuation funding by DARPA

02/25/10 UC Berkeley Mechanical Engineering Department — Continuation funding over the next three years, bringing the total to $5M, has been awarded by DARPA to Professor Costas Grigoropoulos of the Mechanical Engineering Department for research on "Nanofabrication by Tips coupled with Lasers."

Mother of invention

02/03/10 — Berkeley Engineering alumna Michelle Khine, now an assistant professor of biomedical engineering at UC Irvine, has discovered an inventive scientific approach to fabricating cheap microfluidic devices using Shrinky Dinks. When her method of printing microfluidic patterns on Shrinky Dink sheets -- using a laser-jet printer, then heating them in a toaster oven to create patterns of channels and microwells -- was featured and published online in Lab Chip, it had more downloads in one month than any other paper previously posted by the UK's Royal Society of Chemistry.

Nano Song Goes Viral

06/04/09 — A music video that playfully celebrates all things nano has become a megahit for three Berkeley Engineering graduate students and their Cal team.

Nanoneedles Point the Way to Sharper Sensors

06/04/09 — Last year, Connie Chang-Hasnain and graduate student researcher Linus Chuang were searching for a better lab recipe for growing nanowires, conductive threads so thin that every atom they contain has a significant effect on their overall electrical properties. Following the vapor-liquid-solid (VLS) technique for creating semiconductor crystal nanowires, they deposited successive layers of gallium arsenide onto a silicon wafer substrate. But in one low-temperature batch, an area of the silicon lacked the usual gold nanoparticles from which each crystal grows. Under careful examination of the region, they didn't find what they were expecting. Instead of uniform-diameter threads sticking up, they saw tall, needle-like pyramids with hexagonal bases and sharp points. They had discovered a new nanostructure.

Drug Delivery, Nanoscale

05/02/09 — Roughly the size of a matchstick, a slender titanium tube could become a pint-sized weapon against chronic hepatitis C and a host of other debilitating diseases. Three UCSF/UC Berkeley doctoral students are designing a tiny implantable device capable of delivering steady and minute quantities of potent drugs into the bloodstream. The Nano Precision Pump could reduce serious side effects caused by injections of far larger doses of medicine-improving patient quality of life, compliance and cure rates, the students say.

Striking a Nerve

06/02/08 — Nanofibers that create a miniature scaffold for growing cells could soon help patients regenerate severed nerves in their arms and legs, says Shyam Patel, chief scientific officer for a Fremont startup called NanoNerve. Patel is developing a synthetic graft intended to guide neurons across gaps and restore lost connections in nerves serving limbs and other parts of the peripheral nervous system. In the United States alone, an estimated 800,000 people a year experience peripheral nerve injuries that require surgery and that can lead to a loss of sensation and movement. The new device-a flexible conduit that resembles a slender white straw-could open a new treatment option.

Down to the Wire

04/02/08 — For years, nanoengineers have known how to create tiny wire transistors, sensors, light emitters and other useful components, but there's been no sure way to assemble them into integrated circuits because they're too small to manipulate. “You could look at things under a microscope, but you couldn't touch them,” explains EECS professor Ming Wu. But Wu and his research group have developed “optoelectronic tweezers” that can individually address wires and other nanoscale objects and convey them to precise locations. This has been the field's most challenging problem, and solving it paves the way for an entire class of devices from microdisplays to medical imaging tools.