Moth's Eyes are Secret to Solar Cell Improvements

New advances in solar cell technology are being based on the moth’s inner eye.

The moth’s inner eye is the deepest black that has been found in nature. It absorbs almost all light with no reflection to help the insect see at night and to protect it from predators that would notice the reflective surface.

Certain species of moths have developed bumps or nanoscopic structures on the surface of their eyes which allows them to absorb light waves. Scientists discovered these bumps in the 1960’s under microscopic experimenting but little has been done with this knowledge until recently.

This knowledge is useful to us because it will increase the efficiency of light absorption in solar cells. Currently solar panels are expensive to manufacture plus a lot of light is lost due to reflection on the anti-reflective silicon coating that is used which could be translated to energy if harvested.

Different people and companies are researching and creating solar cell products based on the structure of the moth’s eye.

Peng Jiang, an assistant professor at the University of Florida, along with partners, Chih-Hung Sun of the University of Florida and Bin Jiang at Portland State University are working to improve solar cell cost and efficiency. Peng Jiang states,

“Moth eyes are not very reflective,” he points out. “We found our inspiration in nature, trying to mimic the natural nanostructure.”

To reproduce the moth’s eye effect they are using a spin coating technique with nanoparticles that displace themselves at will during the process which creates the necessary ridges that mimic the eye.

This process is fairly inexpensive, which will decrease consumer costs, and it uses advanced technology to improve solar cells.

Peng Jiang’s process creates a surface that has a less than 2 percent reflection whereas current coatings have a 35-40 percent reflection ratio.

Other companies that are using this breakthrough technology are Reflexite and The Fraunhofer Institute for Mechanics of Materials IWM.

These companies have developed new fabrication methods in plastic injection molding which allows for the design of light-absorbing, non-reflective, strong, and easily maintained plastic coatings.

The trick to their successful development of new products based on the moth’s eye is that the nanoparticles must be smaller than the waves of light to be efficient at absorbing that light and are shaped similarly to the eye with hexagonal patterns covering the surface.

This process is similar to soundproofing a room with foam. The patterns are crucial to the outcomes.

These companies are using this technology to improve television screens, computer monitors, mobile device screens, eye glasses, typical construction windows, and the coatings used on automobile gauges such as the speedometer.

If a moth’s eye can enlighten our energy harvesting by a non-reflective, less expensive surface, what will be discovered next? As more scientific breakthroughs evolve to enhance today’s technology, the future holds no bounds.

Resources: Reflexite, Live Science, Physorg, Discover Magazine, and Science Daily

BLOOD AND BONE MARROW DONATION LITERALLY ASKS YOU TO … GIVE OF YOURSELF

Sun Publications (IL) July 30, 1998 In light of the recent blood shortage in the Chicagoland area, medical news has been flooded with pleas for potential donors to raise their arms and volunteer. If somebody is involved in a serious automobile accident or experiences a particularly critical childbirth process, the availability of blood for an emergency transfusion may mean the difference between life and death.

Amy Gardner-Nummer, manager of recruitment and public relations at LifeSource, said her corporation encourages blood donation because it is easy, convenient and a way to help others. in our site bone marrow donation

“You never know when you’re going to be on the other side of the equation — not the donor, but the patient,” she said.

“We need 1,500 donors each day to come forward.” Gardner-Nummer cited a medical study conducted by the University of Kansas in August 1996 that concluded that men who donated blood three times a year could effectively reduce their risk of heart disease by 50 percent.

When red blood cells die, they collect on arteries and veins, forming plaque, which can block blood circulation, she said.

The remarkable reduction in risk cited by the aforementioned study can be attributed to the fact that donation can help promote smoother, more efficient circulation, thus reducing the risk of a heart attack, Gardner-Nummer said.

According to Gardner-Nummer, each one pint-per-person donation has the potential to help multiple people.

First, the red blood cells are used in surgery and for transplants.

Secondly, the platelets can be used in formulating clotting factor for hemophiliacs or for patients undergoing chemotherapy.

Lastly, the plasma portion can help with fluid replacement, as with burn victims for instance.

LifeSource will allow an individual to donate once every eight weeks, which allows enough time for replenishment of the body’s blood supply.

In this respect, Gardner-Nummer described the people as “little contained factories walking around.” Donors must be between 17 and 80 years of age and weigh at least 110 pounds.

In Illinois, 16-year-olds can donate with parental consent, as can 80-plus-year-old seniors with a letter from a physician.

The donation process begins with a miniphysical, during which a nurse takes the potential donor’s temperature, pulse, blood pressure and iron count. Next, a brief but in-depth interview takes place, during which questions regarding medication, recent travel experiences (to rule out visits to CDC-identified malarial zones) and personal life are asked.

Other standard questions include “Have you ever had sex with a man who has had sex with a man since 1977?” or “Have you ever exchanged money or sex for drugs?” Inquiries such as these, Gardner-Nummer said, help donation centers to identify potential high-risk individuals for diseases such as HIV. go to web site bone marrow donation

The subsequent donation process, which lasts about 30 minutes, is not painful, Gardner-Nummer said.

There is absolutely no risk of catching a disease such as hepatitis or HIV through donating, she said.

“The bag and needle are used simply for that donation, so there is no opportunity for you to have contamination or infection passed on,” she said.

Mythical risks aside, she acknowledged that donation is suitable for everybody.

Those who feel lightheaded or faint may choose not to donate but can still help the cause by volunteering for other duties.

Although blood is, well, the lifeline of most donations centers, there is an omnipresent need for bone marrow as well.

Marrow, which is found in the center of bones and is rich in T-cells, is often needed by people with leukemia, sickle-cell anemia or aplastic anemia.

The National Bone Marrow Registry is a compiled list of 6 million individuals and their bone marrow type, as has been determined by a scientific process called antigen testing.

Gardner-Nummer said 3,000 such patients in the United States search the list for a match every month; a match that requires extreme specificity.

It costs $45 for donors to have the few spoonfuls of blood drawn to test for bone marrow type.

But why would a healthy individual pay out-of-pocket just to help another person? “There’s a compassion that says `If there is a person out there and I might be their last chance, count me in,’” Gardner-Nummer said.

An imbalance exists between the number of Caucasians and the number of minorities on the registry.

Because of this discrepancy, Gardner-Nummer said grants exist to encourage minorities to participate.

A nurse prepares to being drawing blood from a volunteer donor during a blood drive.



About Jennifer Shockley

Jennifer is originally from Colorado and has recently moved back from Michigan. She is finishing up her Master’s degree in Architecture. She is currently focusing on urban planning and sustainable design and hopes to gain employment at a design firm specializing in these areas. Jennifer also has writing experience serving as an editor for her school newspaper and college magazine. Jennifer has two cats named Prada and Dior-aptly named after her shoe obsession. You can follow Jennifer on twitter @jenshock81.

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