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Direct doping glass may lead to new materials

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Direct doping glass may lead to new materials

Direct doping glass may lead to new materials

If your casual discussions with friends don’t revolve around upconversion nanocrystals, you’re probably in good company. Very good company. What are upconversion nanocrystals, and what to they have to do with glass?

Infrared light has longer wavelengths than visible light. If we could see it, we would find it beyond the red edge of visible light. About half of the Sun’s energy that reaches the Earth is infrared. Molecules absorb and emit infrared energy, which makes IR energy useful for sensors and detectors. Infrared energy is used in night vision equipment, astronomy and to control equipment.

Generally speaking, lightwaves are what they are. Ultraviolet and infrared light are transmitted from the Sun as part of the “full-spectrum” but our eyes can’t see them directly. They are invisible frequencies, although we can see (and feel) their effects.

So, enter upconversion nanocrystals, which have the ability to “convert” invisible IR light to visible light. Lanthanide-doped nanoparticles have been around since the 1990’s and they (along with a select few other elements) turn out to be reasonably good at converting IR wavelengths into visible light.

This conversion is important because it can enable new sensing techniques. The trouble is that the particles need to be suspended precisely in order to be useful. Glass and ceramics are great media for suspending things, but if you know anything about the way glass operates at the molecular level, you know that it’s kind of random. So far, glass and ceramics have proven to be both enticing and problematic when it comes to integrating upconversion nanocrystals.

Earlier this summer, Australian researchers announced that they have developed a technique to introduce upconversion nanocrystals into glass in such a way that overcomes the challenges they encountered when using ceramics and other types of glass. The development could lead to new advances tumor detection and other biomedical applications, remote radiation sensing and 3-dimensional displays.

Glassprimer™ glass paint is a specialized glass coating that bonds permanently to glass surfaces. GlassPrimer also makes a glass surface molecular activator that is designed to work with UV-inkjet glass printing processes. For more information about Glassprimer™ glass paint, please visit the rest of our site. If you’d like to purchase Glassprimer™ glass paint, please visit our online store.

Photo Credit: David Merrigan, via Flickr.com

Houston reboots glass recycling program

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Houston reboots glass recycling program

Houston reboots glass recycling program

Earlier this year, Houston joined a growing number of US cities that scrapped their glass recycling program because the city’s recycling contractor, Waste Management, determined that it was no longer profitable to include glass in the City’s curbside recycling program. Last week, Houston’s mayor announced that it had reached an agreement with Strategic Materials, the largest glass recycler in North America, to collect Houston’s glass in a pilot program.

Pilot program seeks to re-energize glass recycling

According to the City, Strategic Materials has placed two containers in centralized collection areas for residents to drop off their unwanted container glass. Prior to dropping off the glass, residents are asked to rinse out the containers and remove any caps, lids or corks. Strategic Materials intends to place an additional eight containers in other parts of the city. The City of Houston also operates nine glass drop-off stations for residents who want to recycle container glass.

Under the pilot program with Strategic Materials, the City of Houston will not receive any revenue for the recycled glass, but the pilot offers residents who prefer to recycle glass a free option for safely disposing of container glass.

The issue of glass recycling has emerged in many cities, as they try to cope with the increase in volume of container glass their residents generate at the same time the worldwide demand for recycled container glass has dropped. The City of Houston saved about $2 million by eliminating container glass from the list of items accepted by its curbside recycling program.

According to the US Environmental Protection Agency, about 28% of all container glass in the US is recycled, and 80% of the recycled glass comes from residential sources. In the absence of municipal container recycling programs, the agency estimates that more than 90% of container glass would end up in landfills.

About half of all states have at least one glass processing facility that can manage recycled container glass. For the states that don’t have processing facilities, that means paying extra to transport recycled glass to the nearest processing plant. That adds costs and reduces the already-slim margins involved in recycling glass. The issue of cost is significant, and few municipalities have come up with cost-effective methods for recycling container glass.

At the same time, glass has become an architectural staple for both interior and exterior design. If you’d like to see some inspiration for decorating with glass, please check out the rest of our site. If you’d like to purchase Glassprimer™ glass paint, please visit our online store .

Photo Credit: Gulf Coast Regional Blood Center , via Flickr.com