Researchers grow artificial hairs with clever physics trick
(Press-News.org) Things just got hairy at Princeton.
Researchers found they could coat a liquid elastic on the outside of a disc and spin it to form useful, complex patterns. When spun just right, tiny spindles rise from the material as it cures. The spindles grow as the disc accelerates, forming a soft solid that resembles hairs.
Inspired by biological designs and rationalized with mathematical precision, the new method could be used at an industrial scale for production with plastics, glasses, metals and smart materials.
The researchers published their findings on Feb. 22 in the Proceedings of the National Academy of Sciences.
Their technique draws on fairly simple physics but turns an old set of engineering problems into a new manufacturing solution. The method's simplicity, cheaper and more sophisticated than conventional molds, comes as part of a major shift toward additive manufacturing.
It also promises to play a key role in developing robotic sensing capabilities and in surfaces that mimic biological patterns -- the hairs on a spider leg or on a lotus leaf -- deceptively simple structures that provide essential life functions.
"Such patterns are ubiquitous in nature," said Pierre-Thomas Brun, an assistant professor of chemical and biological engineering at Princeton and the study's principal investigator. "Our approach leverages the way these structures form naturally."
The paper's authors also include Etienne Jambon-Puillet, a postdoctoral researcher at Princeton, and Matthieu Royer Piéchaud, formerly of Princeton. This work was partially funded by a grant from the National Science Foundation (DMR-1420541) through the Princeton Center for Complex Materials.
ELSE PRESS RELEASES FROM THIS DATE:
(Boston)--Tau is a protein that helps stabilize the internal skeleton of nerve cells (neurons) in the brain. Groups of toxic tau protein, termed tau oligomers, drive disease progression and memory loss in Alzheimer's disease (AD). A new study from Boston University School of Medicine (BUSM) shows how these tau oligomers form, and, correspondingly, how they can be prevented.
AD is a major cause of disease in the elderly and places a huge financial cost on the health care system. Scientists have known for a long time that two proteins (?-amyloid and tau) clump and accumulate in the brains ...
LOGAN, UTAH, USA -- You might not like mosquitoes, but they like you, says Utah State University biologist Norah Saarman. And where you lead, they will follow.
In addition to annoying bites and buzzing, some mosquitoes carry harmful diseases. Aedes aegypti, the so-called Yellow Fever mosquito and the subject of a recent study by Saarman and colleagues, is the primary vector for transmission of viruses causing dengue fever, chikungunya and Zika, as well as yellow fever, in humans.
"Aedes aegypti is an invasive species to North America that's become widespread in the eastern United States," says Saarman, assistant professor in USU's Department of Biology and the USU Ecology Center, whose research focuses ...
Adolescents and teens may be more likely to be bullied by their friends -- and friends-of-friends -- than classmates they don't know as well, according to a new study.
Diane Felmlee, Distinguished Professor of Sociology and Demography at Penn State and researcher on the paper, said the findings give new insight into how and why bullying occurs -- important information for anti-bullying efforts.
"People often assume that bullying occurs between relative strangers, or that it targets those on the fringes of the social network," Felmlee said. "Those do occur, but in our study, we find that the rate of peer aggression is significantly higher between those students who are closely linked. Furthermore, our finding is not due to friends simply spending ...
In a new study out of University of California San Diego School of Medicine, researchers have identified a universal strain of bacteria derived from healthy human skin that can treat the most common type of eczema, also known as atopic dermatitis.
In the paper published Feb. 22, 2021, in Nature Medicine, the research team investigated the safety and mechanisms of this certain bacteria in a first-in-human, Phase I, double-blinded clinical trial looking to treat people living with eczema. Of the 54 participants, two-thirds reported improvements in their ...
The diversity and numbers of wild salmon in Northern B.C. have declined approximately 70 per cent over the past century, according to a new Simon Fraser University study.
Researchers drawing on 100-year-old salmon scales report that recent numbers of wild adult sockeye salmon returning to the Skeena River are 70 per cent lower than 100 years ago. Wild salmon diversity in the Skeena watershed has similarly declined by 70 per cent over the last century.
The research undertaken by Simon Fraser University (SFU) and Fisheries and Oceans Canada was published today in the Journal of Applied Ecology.
The research team applied modern genetic tools to salmon scales collected from commercial ...
Boston, Mass. - Even with more than 1.5 million Americans receiving a COVID vaccine each day, officials estimate it will take many more months before enough people are protected from the deadly virus. Until then, and potentially beyond, experts agree that opening up schools, restaurants and other public places as safely as possible will rely on widespread testing for SARS-CoV-2, the virus that causes COVID-19.
As of June 2020, the U.S. Food and Drug Administration (FDA) had granted emergency use authorization for more than 85 different viral DNA test kits -- or assays -- each with widely varying degrees of sensitivity and unknown rates of accuracy. However, with no existing gold standard test for the novel coronavirus, there's little data on which ...
A paper recently published in the scientific journal Stem Cells and Development shares an important advancement in conservation -- one that may make the difference between survival and extinction for wildlife species that have been reduced to very small population sizes. Using fibroblast cells that have been preserved in San Diego Zoo Global's Frozen Zoo®, scientists have been able to generate induced pluripotent stem cells of northern and southern white rhinoceroses. This important breakthrough is the first step in a complex process for generating gametes from deceased and non-reproductive individuals of these two subspecies.
"For the northern white rhino, which is functionally extinct, the only hope for survival may be in the ...
ITHACA, N.Y. - Cornell University scientists have identified a new contender when it comes to quantum materials for computing and low-temperature electronics.
Using nitride-based materials, the researchers created a material structure that simultaneously exhibits superconductivity - in which electrical resistance vanishes completely - and the quantum Hall effect, which produces resistance with extreme precision when a magnetic field is applied.
"This is a beautiful marriage of the two things we know, at the microscale, that give electrons the most startling ...
LOS ALAMOS, N.M., Feb. 22, 2021--A team of quantum theorists seeking to cure a basic problem with quantum annealing computers--they have to run at a relatively slow pace to operate properly--found something intriguing instead. While probing how quantum annealers perform when operated faster than desired, the team unexpectedly discovered a new effect that may account for the imbalanced distribution of matter and antimatter in the universe and a novel approach to separating isotopes.
"Although our discovery did not the cure the annealing time restriction, it brought a class of new physics problems that can now be studied with quantum annealers without requiring they be too slow," said Nikolai Sinitsyn, a theoretical physicist at Los Alamos National ...
HOUSTON - (Feb. 22, 2021) - Governments with strong female representation are more likely to deliver on campaign promises, according to new research from Rice University.
"The Effects of Women's Descriptive Representation on Government Behavior" by author Jonathan Homola, an assistant professor of political science at Rice, examines campaign promises and subsequent policymaking by parties in power in 10 European countries, the United States and Canada along with data on women in party leadership and elected offices.
The study also showed that promises are even more likely to be kept when women in government assume leadership roles.
Homola said the research demonstrates the importance of women playing part in the ...
LAST 30 PRESS RELEASES:
[Press-News.org] Researchers grow artificial hairs with clever physics trick