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Source: http://feedproxy.google.com/~r/Techcrunch/~3/s0azqnY2g80/
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The Equifax credit reporting agency, with the aid of thousands of human resource departments around the country, has assembled what may be the most powerful and thorough private database of Americans? personal information ever created, containing 190 million employment and salary records covering more than one-third of U.S. adults.
Some of the information in the little-known database, created through an Equifax-owned company called The Work Number, is sold to debt collectors, financial service companies and other entities.
"It's the biggest privacy breach in our time, and it?s legal and no one knows it?s going on," said Robert Mather, who runs a small employment background company named Pre-Employ.com. "It's like a secret CIA."
Despite all the information Americans now share on social media and websites, and all the data we know companies collect on us, one piece of information is still sacred to most people: their salaries. After all, who would post their salary as a status update on Facebook or in a tweet?
But salary information is also for sale by Equifax through The Work Number. Its database is so detailed that it contains week-by-week paystub information dating back years for many individuals, as well as other kinds of human resources-related information, such as health care provider, whether someone has dental insurance and if they?ve ever filed an unemployment claim. In 2009, Equifax said the data covered 30 percent of the U.S. working population, and it now says The Work Number is adding 12 million records annually.
How does Equifax obtain this sensitive and secret information? With the willing aid of thousands of U.S. businesses, including many of the Fortune 500. Government agencies -- representing 85 percent of the federal civilian population, including workers at the Department of Defense, according to Equifax -- and schools also work with The Work Number. Many of them let Equifax tap directly into their data so the credit bureau can always have the latest employment information. In fact, these organizations actually pay Equifax for the privilege of giving away their employees' personal information.
Equifax turns around and sells some of this data to third parties, including debt collectors and other financial services companies.?
Equifax declined to be interviewed, but in an emailed statement to NBCNews.com, it confirmed that it shares "employment data" with debt collectors and others, and said it does so in compliance with Fair Credit Reporting Act guidelines.?
"In all cases, these entities must have a permissible purpose to request employment information," Equifax spokesman Timothy Klein said.?
He also said consumers give these third parties the right to access the data "at the time of application" for credit.
"A consumer grants verifiers (creditors) and their assigned debt collectors the right to verify employment should the consumer default on their account," he said.?
Data for debt collectors
Companies sign up for The Work Number because it gives them an easy way to outsource employment verification of former workers. Firms hate taking these calls, which usually come when a former employee is applying for a new job, because they are a costly distraction for human resources departments and open the firm up to lawsuits if someone says something disparaging about the former employee. So they contract with The WorkNumber, which automates the process. In exchange, firms upload their human resources data to The Work Number, which was part of an independent St.Louis-based firm named TALX until it was acquired by Equifax in 2007 for $1.4 billion.
The Work Number offers consumers some benefits. It provides an easy way for prospective landlords to verify an applicant's income, for example. Consumers tell the Work Number they want a one-time access code, which they then give to a landlord so he or she can verify that the potential tenant can really afford the apartment.
But The Work Number serves dual purposes. It?s also a massive database that Equifax monetizes in a variety of ways, despite the reassuring-sounding messages found all over TheWorkNumber.com.
"Can just anyone get my income information from The Work Number?" reads one passage. Answer: "No. You have to give someone authorization to get your income information from the service."
Employers who sign up for the service go to great pains to reassure workers that their data is safe and secret. Columbia University, when it explained to employees it was transitioning to The Work Number, posted this on the school's website:
"You are the only person who can authorize access to your salary information."
But Kathy Sandy of Sommerville, N.J. was surprised to find that a debt collector had accessed information from her report two years ago, something she learned only when she obtained her "consumer disclosure" from The Work Number. Because the data is considered a credit report, consumers are entitled to one free report every year. The report shows what data the report contains, and what entities have seen it.
Sandy's Work Number report, which she shared with NBC News, is 22 pages long -- an amazingly detailed history of every paycheck she had received for years. The first page of the report lists "verifiers who have requested your data in the past 24 months." On the list is "Pressler and Pressler," a law firm that specializes in debt collection. The firm had sued her in small claims court over a credit card debt that she says she was already repaying.
"I found out debt collectors can access this information, which is strange," Sandy said. "I assumed with The Work Number, for that information, you had to have a (passcode) ? but they got in, and got it somehow without my consent."
In brochures where Equifax advertises sale of the data, it's not shy about the source.
"The Work Number specializes in employment and income verification. It's direct from the source: the employer. It's current, as of the last pay period. It's delivered quickly -- on demand," says one brochure, titled "Portfolio Monitoring."
In his statement to NBC News, Klein confirmed that "pay rate" information is shared with third parties, including "mortgage, auto and other financial services credit grantors," as authorized under the Fair Credit Reporting Act.
He denied that salary information is sold to debt collectors, however.
"Debt/Collection agencies may request employment information -- which may be nothing more than verifying that a consumer is working where they say they are ? if it qualifies under permissible purpose," he wrote. "Collections agencies are not provided salary information."
That contradicts an assertion made recently by Equifax CEO Richard Smith in 2009, when he talked about how detailed The Work Number data is.
"With FirstSearch and TALX we can provide information about a debtor?s location, income and employment," said Smith in an interview published on NYSE Magazine?s website, referring to The Work Number?s former parent company. "That can help prioritize which accounts to pursue first. If they?re employed, that business has a better shot at collecting what is owed to them."
Klein said Smith misspoke when describing TALX?s services, and reiterated that salary information on consumers is not sold to debt collectors.
'Unbelievably scary'
With or without the income data, The Work Number data is incredibly valuable to debt collectors -- and it may come as a surprise to many workers that their employers, directly or unwittingly, help debt collectors.
Equifax markets The Work Number specifically to student loan issuers. In another brochure on the firm's website, Equifax brags that The Work Number makes debt collectors' jobs easier.
"The Work Number produced a 5.5 percent lift in Right Party Contact and a 7.3 percent lift in Collections Resolution versus current skip-trace methods," the "case study" brochure says.
Equifax?s resale of The Work Number data doesn?t stop there. It also offers "portfolio monitoring" to financial firms who might want to market their products to consumers ? or to get early warning on someone who might soon land in financial trouble. It calls this "proactive managing of risk."?
"The Work Number is part of our employment and income verification service. It provides continual track of changes to your customer or client portfolio, delivered on demand per your schedule," it says. "Simply submit a portfolio of customer or client accounts and The Work Number does the rest. ... Using The Work Number to stay abreast of employment changes can expand your ability to mitigate risk while maximizing product and service potential."
Mather has been in the employer data business for more than 20 years, and he says that if Americans suspected their employers were giving away their personal information to a credit bureau, they'd be shocked.
"The story here is how (The Work Number) is getting this information," he said. "When people find out, no respectable employer will continue to do this."
Larry Ponemon is a privacy expert who operates The Ponemon Institute, a consulting firm. He said he?d never heard of companies selling employer data to debt collectors.
"Are you joking? Oh my god, I'm shocked," Ponemon said when the business was described to him. "This is unbelievably scary. I consider payroll information very sensitive and private." In studies he's conducted, salary data is always among the information consumers say is most private.
"If the public knew about this, there would be such outrage," he said. "It's just ... really depressing."
Paul Stephens, director of policy and advocacy at the Privacy Rights Clearinghouse, had heard of The Work Number, but only because some consumers have complained to his agency that the data in its database is inaccurate. Some workers find that when they try to use the information for employment verification, their titles are outdated or otherwise misrepresent their work history, which can be embarrassing for a job applicant.
When told that the data is sold to third parties, he said he was under the impression the data was not shared.
"I think it is something that would be offensive to many people. One typically considers salary information to be shared by your employer just with IRS," he said.?
A glance at the language on The Work Number's website suggested to Stephens that the firm is legally within its rights to share the information, however.
"You get into the 'permissible purpose' doctrine," he said. "Debt collectors have a permissible purpose to look at your credit information. It was my impression that the data was only being given out when employees released it."
'Secret' process?
Data brokers are under heightened scrutiny in Washington, D.C., lately. There are two separate congressional investigations of the industry, and the Federal Trade Commission announced in December that it had begun an inquiry into how brokers obtain their information. Equifax received an inquiry letter from the FTC, but only for the data broker portion of its business involving non-financial data, such as criminal background records and address information.
Credit reporting agencies, such as The Work Number, are distinct from data brokers and are governed by special rules. Ironically, those special rules may open the door for Equifax -- and the credit-reporting side of its business -- to resell the salary information, says Katrina Blodgett, a lawyer with the Federal Trade Commission. She is one the agency?s experts on the Fair Credit Reporting Act.?
The FTC filed a case against TALX and Equifax in 2008 for allegedly failing to provide employers with sufficient notice about their disclosure responsibilities under the Fair Credit Reporting Act. Equifax admitted no wrongdoing and paid a small fine. ?
Blodgett said the Fair Credit Reporting Act and subsequent updates give consumers specific legal rights, such as the ability to dispute errors in credit reports. But it also creates permissible purposes for access, including giving financial service companies the right to review credit reports of consumers they do business with.?
"It?s not as easy as it should be to say whether debt collectors can get your consumer reports, because it depends on the circumstance," she said, adding that she believed Equifax could have the right to sell the salary information to debt collectors because it is part of a credit report.
Much attention has been paid to the use of credit reports by human resource departments in recent years, and Congress gave job applicants special rights when a credit report is used during the job interview process. The reverse isn?t true, however, Blodgett pointed out.
"There are special restrictions on how credit reports can be used in hiring decisions, but there are no special restrictions on how employment reports (such as salary information) is used for non-employment purposes," she said.
She said she wasn?t surprised that Equifax is selling the information in The Work Number.
"They are a credit bureau. They sell credit information to lenders," she said.
Mather wants the sale of employee information halted. His firm also performs third-party employment verification, but he does not resell the data he collects.
"I strongly believe there is no reason to resell employee information to debt collectors without the permission of the employer and employee," he said. "This 'secret' process needs to stop. I hope eventually a simple law is passed making it required to get the permission of the employee BEFORE his information is resold. It simply should NOT be used for any other purpose except for employment purposes without permission. In my view, it is a betrayal of trust."
Consumers who want to see what information The Work Number has on their employment history can visit this page on the TheWorkNumber.com. While reports are available online, consumers may have to fill out a form and mail it to The Work Number in some cases.
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Melissa and Ryan Will sit with Bob Sullivan. As new homeowners, every penny counts, and they find a few extra ones by refinancing their car and taking stock of their expenses.
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The U.S. News Short List, separate from our overall rankings, is a regular series that magnifies individual data points in hopes of providing students and parents a way to find which undergraduate or graduate programs excel or have room to grow in specific areas. Be sure to explore The Short List: College and The Short List: Grad School to find data that matters to you in your college or grad school search.
Private colleges often come with hefty price tags, which can be an automatic turnoff for prospective students. Close to 43 percent of incoming freshmen said they "carefully considered" cost when choosing which school to attend, according to an annual survey of more than 190,000 first-time, full-time students by the University of California--Los Angeles.
For price-conscious students, the cost of private school can be difficult to reconcile against their less expensive public counterparts. Average private school tuition for the 2012-2013 school year was $28,946, compared with $8,176 (in-state) and $18,855 (out-of-state) at public institutions, according to data reported by 1,088 ranked public and private universities in an annual survey by U.S. News.
[Discover tips and resources to help pay for college.]
But private does not always equal expensive. The average tuition and fees at the 10 least expensive private schools was $7,558 in 2012-2013--more than $21,000 below the average for private institutions--and some schools still fall far below that average.
At Berea College, a private liberal arts school in Kentucky, tuition and fees totaled just $980 for 2012-2013, less than any other private or public school, with the exception of military academies. In fact, all students at Berea work on campus in exchange for free tuition, and some receive financial aid to cover the cost of fees.
Tuition and fees at Brigham Young University--Provo, a private university in Utah, totaled $4,710 for 2012-2013, roughly $24,200 below the average sticker price for a private school and almost $3,500 less than average in-state tuition at public universities.
At BYU, a Mormon university, religious affiliation factors into the lower than average cost. Tuition for students who are not members of the Church of Jesus Christ of Latter-day Saints was $9,420 for 2012-2013, still far below the national average, thanks to a subsidy from the church, according to the school's website.
[Learn how your tuition dollars are spent.]
Several of the least expensive private schools are designated as Rank Not Published (RNP), which means they fell in the bottom one fourth of their ranking category. U.S. News calculates a numerical rank for these schools, but has decided not to publish them. Unranked colleges, which do not submit enough data for U.S. News to calculate a ranking, were not considered for this report.
Below are the 10 private colleges and universities with the lowest tuition and fees for the 2012-2013 school year (figures do not include room and board, books, and other miscellaneous costs):
| School name (state) | 2012-2013 tuition & fees | U.S. News rank and category |
|---|---|---|
| Berea College (KY) | $980 | 75, National Liberal Arts Colleges |
| Brigham Young University--Provo (UT) | $4,710 | 68, National Universities |
| Arkansas Baptist College | $7,800 | RNP, Regional Colleges (South) |
| Rust College (MS) | $8,300 | RNP, National Liberal Arts Colleges |
| Lane College (TN) | $8,560 | RNP, National Liberal Arts Colleges |
| Concordia College (AL) | $8,590 | RNP, Regional Colleges (South) |
| Mid-Continent University (KY) | $8,810 | RNP, Regional Colleges (South) |
| Blue Mountain College (MS) | $9,230 | 23, Regional Colleges (South) |
| Amridge University (AL) | $9,260 | RNP, National Liberal Arts Colleges |
| Life University (GA) | $9,342 | RNP, National Liberal Arts Colleges |
Don't see your school in the top 10? Access the U.S. News College Compass to find tuition data, complete rankings, and much more.
U.S. News surveyed more than 1,800 colleges and universities for our 2012 survey of undergraduate programs. Schools self-reported a myriad of data regarding their academic programs and the makeup of their student body, among other areas, making U.S. News's data the most accurate and detailed collection of college facts and figures of its kind. While U.S. News uses much of this survey data to rank schools for our annual Best Colleges rankings, the data can also be useful when examined on a smaller scale. U.S. News will now produce lists of data, separate from the overall rankings, meant to provide students and parents a means to find which schools excel, or have room to grow, in specific areas that are important to them. While the data come from the schools themselves, these lists are not related to, and have no influence over, U.S. News's rankings of Best Colleges or Best Graduate Schools. The tuition and fees data above are correct as of Jan. 29, 2013.
Source: http://news.yahoo.com/10-least-expensive-private-colleges-universities-174610869.html
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BANGKOK (AP) ? The price of oil rose slightly Monday, a sign of investor confidence in the U.S. economy's recovery ahead of the release of data this week on jobs, home sales and the country's overall growth.
Benchmark oil for March delivery was up 8 cents to $95.96 per barrel at late afternoon Bangkok time in electronic trading on the New York Mercantile Exchange. The contract fell 7 cents to close at $95.88 on the Nymex on Friday after a report showed a cooling off in new U.S. home sales.
The U.S. government will release monthly durable goods figures later Monday, and the National Association of Realtors will report on pending home sales for December. Later in the week, reports on weekly jobless claims and employment data for January are due.
Analysts expect to see continuing signs of a sluggish recovery, even amid lowered expectations for fourth-quarter economic growth for 2012, to be released by the U.S. Commerce Department on Wednesday.
"If 4Q growth comes in at the 1.5 percent we expect, it will have averaged 2 percent over the past four quarters ... Slow and steady is the name of the game," analysts at DBS Bank Ltd. in Singapore said in a market commentary.
Brent crude, used to price international varieties of oil, fell 28 cents to $113 per barrel on the ICE Futures exchange in London.
In other energy futures trading on Nymex:
? Wholesale gasoline fell 0.8 cent to $2.882 per gallon.
? Natural gas fell 7.4 cents to $3.37 per 1,000 cubic feet.
? Heating oil fell 0.1 cent to $3.048 a gallon.
Source: http://news.yahoo.com/oil-rises-near-96-ahead-us-data-093837768--finance.html
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NEW ORLEANS (Reuters) - President Barack Obama's comments that he would "think long and hard" before letting a son play American football were shrugged off by Super Bowl coaches on Monday but there was some agreement from players that the game needed to evolve.
Obama's stance came in an interview with the New Republic, published on Sunday, where he was asked how he squares his love of the game with rising awareness of the impact of repeated head injuries on football players.
"I'm a big football fan, but I have to tell you if I had a son, I'd have to think long and hard before I let him play football," said Obama.
"And I think that those of us who love the sport are going to have to wrestle with the fact that it will probably change gradually to try to reduce some of the violence," he said.
San Francisco 49ers coach Jim Harbaugh was dismissive of Obama's comments.
"Well I have a four-month old, almost five-month old son, Jack Harbaugh, and if President Obama feels that way then there will be a little bit less competition for Jack Harbaugh when he gets older," he told reporters.
Brother John Harbaugh, coach of the Baltimore Ravens, the other team in Sunday's Super Bowl, said he didn't agree with Obama and stressed the game had much to offer.
"Football is a great game ... It's challenging, it's tough, it's hard. There is no game like football. It's the type of sport that brings out the best in you. It kind of shows who you are.
"I think it's a huge part of our educational system in this country. And it's going to be around for a long time," he said.
The 49ers' outside linebacker Aldon Smith said players were well aware of the risks involved.
"I think the game has been like it always has. It's a physical game. Everybody plays hard. Guys get hit sometimes and that's what we all know coming into the game.
"We all signed up for it. It's not like we signed up and thought we were going to play tennis," he said.
Concerns over the risk of brain injury from repeated concussions suffered by players in the NFL are growing with hundreds of former players involved in legal action against the league.
The NFL, America's most popular television sport and a $9 billion a year industry, has introduced tougher rules and regulations regarding the treatment of concussion.
Ravens center Matt Birk said he understood Obama's concerns and felt the game was beginning to change.
"I have three sons and I think anyone who is a parent can relate to that. Certainly it is a dangerous game and we're finding out more and more, every day, the long-term effects that this game can have.
"I think it's a joint effort with the (NFL) commissioner, with coaches, with players, with everybody, everybody that wants to watch and make this game as safe as it can be. I think we're making strides in that," he said.
San Francisco cornerback Tarell Brown agreed.
"It's definitely a dangerous sport, but at the end of the day the league is doing a great job of putting in place things to help players with safety," he said.
"I can understand where President Obama is coming from ... but at the same time the league is doing a great job of preventing a lot of those things."
(Editing by Ian Ransom)
Source: http://news.yahoo.com/super-bowl-coaches-bristle-obamas-comments-031036722--nfl.html
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13 hrs.
Rosa Golijan , NBC News
Since Vine, Twitter's video-sharing service, launched on Thursday, it's been plagued by all sorts of woes. We noticed that it lacks privacy settings and?abuse prevention measures, Facebook prevented it from finding any friends through the social network, and now ... well, now pornographic?content has slipped?into Vine's?"Editor's Picks" section.
Vine's a rather neat service, in theory. If you've got an iOS device, you can create and share Vine videos. All you have to do is point your iPhone (or iPod Touch) at something and press your finger to the screen to record a clip up to six seconds in length (both sound and motion are captured, of course). Once done, you can share it to Vine, Twitter and Facebook. You can also use the app to browse through popular videos and those featured as "Editor's Picks."
And that's where Vine's latest troubles appear. On Monday morning, a video shared by "nsfwvine" ??an account created for the sole purpose of posting pornographic videos to Vine (hence the "Not Safe For Work" part of the name)???received the service's "Editor's Pick" badge of honor.
While the video did lose the "Editor's Pick" badge later in the morning, it was not removed from the service. Instead, it now carries a warning message declaring that the video?"may contain sensitive content" and requires a tap to be viewed. (From what we can tell, this warning message is automatically added to videos which are reported as inappropriate by Vine users.)
We have reached out to Twitter for more information regarding how the video in question?? which shows a young woman and a?sex toy?? was chosen as an "Editor's Pick." We wondered if some sort of automated process may be involved in the selection. A Twitter spokesperson explained that an actual person was actually to blame. "A human error resulted in a video with adult content becoming one of the videos in Editor's Picks," she wrote in an email to NBC News. "[U]pon realizing this mistake we removed the video immediately. We apologize to our users for the error."
We have also contacted Apple, as we suspect the Cupertino-based company is probably not all too happy about pornographic content being?prominently?featured in an iOS app. (It has banned apps for far less racy issues in the past.)
In the meantime, obscene material continues to flood into Vine. Several accounts ? including "nsfwvine" ? have been posting pornographic clips since Vine launched last week. Not all of porn clips?carry the "sensitive content" warning yet and it's not clear if any have been removed so far.
"Wow. How did this happen, Vine?" a user asked?on one of the videos, while another wondered "[c]an I flag this as inappropriate more than once?"
Want more tech news?or interesting?links? You'll get plenty of both if you keep up with Rosa Golijan, the writer of this post, by following her on?Twitter, subscribing to her?Facebook?posts,?or circling her?on?Google+.
Source: http://www.nbcnews.com/technology/technolog/twitters-vine-features-porn-video-editors-pick-1C8137828
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Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Cambridge, Mass. January 28, 2013 - A team of materials scientists at Harvard University and the University of Exeter, UK, have invented a new fiber that changes color when stretched. Inspired by nature, the researchers identified and replicated the unique structural elements that create the bright iridescent blue color of a tropical plant's fruit.
The multilayered fiber, described today in the journal Advanced Materials, could lend itself to the creation of smart fabrics that visibly react to heat or pressure.
"Our new fiber is based on a structure we found in nature, and through clever engineering we've taken its capabilities a step further," says lead author Mathias Kolle, a postdoctoral fellow at the Harvard School of Engineering and Applied Sciences (SEAS). "The plant, of course, cannot change color. By combining its structure with an elastic material, however, we've created an artificial version that passes through a full rainbow of colors as it's stretched."
Since the evolution of the first eye on Earth more than 500 million years ago, the success of many organisms has relied upon the way they interact with light and color, making them useful models for the creation of new materials. For seeds and fruit in particular, bright color is thought to have evolved to attract the agents of seed dispersal, especially birds.
The fruit of the South American tropical plant, Margaritaria nobilis, commonly called "bastard hogberry," is an intriguing example of this adaptation. The ultra-bright blue fruit, which is low in nutritious content, mimics a more fleshy and nutritious competitor. Deceived birds eat the fruit and ultimately release its seeds over a wide geographic area.
"The fruit of this bastard hogberry plant was scientifically delightful to pick," says principal investigator Peter Vukusic, Associate Professor in Natural Photonics at the University of Exeter. "The light-manipulating architecture its surface layer presents, which has evolved to serve a specific biological function, has inspired an extremely useful and interesting technological design."
Vukusic and his collaborators at Harvard studied the structural origin of the seed's vibrant color. They discovered that the upper cells in the seed's skin contain a curved, repeating pattern, which creates color through the interference of light waves. (A similar mechanism is responsible for the bright colors of soap bubbles.) The team's analysis revealed that multiple layers of cells in the seed coat are each made up of a cylindrically layered architecture with high regularity on the nano- scale.
The team replicated the key structural elements of the fruit to create flexible, stretchable and color-changing photonic fibers using an innovative roll-up mechanism perfected in the Harvard laboratories.
"For our artificial structure, we cut down the complexity of the fruit to just its key elements," explains Kolle. "We use very thin fibers and wrap a polymer bilayer around them. That gives us the refractive index contrast, the right number of layers, and the curved, cylindrical cross-section that we need to produce these vivid colors."
The researchers say that the process could be scaled up and developed to suit industrial production.
"Our fiber-rolling technique allows the use of a wide range of materials, especially elastic ones, with the color-tuning range exceeding by an order of magnitude anything that has been reported for thermally drawn fibers," says coauthor Joanna Aizenberg, Amy Smith Berylson Professor of Materials Science at Harvard SEAS, and Kolle's adviser. Aizenberg is also Director of the Kavli Institute for Bionano Science and Technology at Harvard and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard.
The fibers' superior mechanical properties, combined with their demonstrated color brilliance and tunability, make them very versatile. For instance, the fibers can be wound to coat complex shapes. Because the fibers change color under strain, the technology could lend itself to smart sports textiles that change color in areas of muscle tension, or that sense when an object is placed under strain as a result of heat.
###
Additional coauthors included Alfred Lethbridge at the University of Exeter, Moritz Kreysing at Ludwig Maximilians University (Germany), and Jeremy B. Baumberg, Professor of Nanophotonics at the University of Cambridge (UK).
This research was supported by the U.S. Air Force Office of Scientific Research Multidisciplinary University Research Initiative, by the UK Engineering and Physical Sciences Research Council, and through a postdoctoral research fellowship from the Alexander von Humboldt Foundation. The researchers also benefited from facilities at the Harvard Center for Nanoscale Systems, which is part of the National Nanotechnology Infrastructure Network supported by the U.S. National Science Foundation.
?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Cambridge, Mass. January 28, 2013 - A team of materials scientists at Harvard University and the University of Exeter, UK, have invented a new fiber that changes color when stretched. Inspired by nature, the researchers identified and replicated the unique structural elements that create the bright iridescent blue color of a tropical plant's fruit.
The multilayered fiber, described today in the journal Advanced Materials, could lend itself to the creation of smart fabrics that visibly react to heat or pressure.
"Our new fiber is based on a structure we found in nature, and through clever engineering we've taken its capabilities a step further," says lead author Mathias Kolle, a postdoctoral fellow at the Harvard School of Engineering and Applied Sciences (SEAS). "The plant, of course, cannot change color. By combining its structure with an elastic material, however, we've created an artificial version that passes through a full rainbow of colors as it's stretched."
Since the evolution of the first eye on Earth more than 500 million years ago, the success of many organisms has relied upon the way they interact with light and color, making them useful models for the creation of new materials. For seeds and fruit in particular, bright color is thought to have evolved to attract the agents of seed dispersal, especially birds.
The fruit of the South American tropical plant, Margaritaria nobilis, commonly called "bastard hogberry," is an intriguing example of this adaptation. The ultra-bright blue fruit, which is low in nutritious content, mimics a more fleshy and nutritious competitor. Deceived birds eat the fruit and ultimately release its seeds over a wide geographic area.
"The fruit of this bastard hogberry plant was scientifically delightful to pick," says principal investigator Peter Vukusic, Associate Professor in Natural Photonics at the University of Exeter. "The light-manipulating architecture its surface layer presents, which has evolved to serve a specific biological function, has inspired an extremely useful and interesting technological design."
Vukusic and his collaborators at Harvard studied the structural origin of the seed's vibrant color. They discovered that the upper cells in the seed's skin contain a curved, repeating pattern, which creates color through the interference of light waves. (A similar mechanism is responsible for the bright colors of soap bubbles.) The team's analysis revealed that multiple layers of cells in the seed coat are each made up of a cylindrically layered architecture with high regularity on the nano- scale.
The team replicated the key structural elements of the fruit to create flexible, stretchable and color-changing photonic fibers using an innovative roll-up mechanism perfected in the Harvard laboratories.
"For our artificial structure, we cut down the complexity of the fruit to just its key elements," explains Kolle. "We use very thin fibers and wrap a polymer bilayer around them. That gives us the refractive index contrast, the right number of layers, and the curved, cylindrical cross-section that we need to produce these vivid colors."
The researchers say that the process could be scaled up and developed to suit industrial production.
"Our fiber-rolling technique allows the use of a wide range of materials, especially elastic ones, with the color-tuning range exceeding by an order of magnitude anything that has been reported for thermally drawn fibers," says coauthor Joanna Aizenberg, Amy Smith Berylson Professor of Materials Science at Harvard SEAS, and Kolle's adviser. Aizenberg is also Director of the Kavli Institute for Bionano Science and Technology at Harvard and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard.
The fibers' superior mechanical properties, combined with their demonstrated color brilliance and tunability, make them very versatile. For instance, the fibers can be wound to coat complex shapes. Because the fibers change color under strain, the technology could lend itself to smart sports textiles that change color in areas of muscle tension, or that sense when an object is placed under strain as a result of heat.
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Additional coauthors included Alfred Lethbridge at the University of Exeter, Moritz Kreysing at Ludwig Maximilians University (Germany), and Jeremy B. Baumberg, Professor of Nanophotonics at the University of Cambridge (UK).
This research was supported by the U.S. Air Force Office of Scientific Research Multidisciplinary University Research Initiative, by the UK Engineering and Physical Sciences Research Council, and through a postdoctoral research fellowship from the Alexander von Humboldt Foundation. The researchers also benefited from facilities at the Harvard Center for Nanoscale Systems, which is part of the National Nanotechnology Infrastructure Network supported by the U.S. National Science Foundation.
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Source: http://www.eurekalert.org/pub_releases/2013-01/hu-bfc012813.php
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