Tag Archives: Pohang University of Science and Technology

Save those coffee grounds, they can be used for fuel storage

A September 1, 2015 news item on Nanowerk features research from Korea that could point the way to using coffee grounds for methane storage (Note: A link has been removed),

Scientists have developed a simple process to treat waste coffee grounds to allow them to store methane. The simple soak and heating process develops a carbon capture nanomaterial with the additional environmental benefits of recycling a waste product.

The results are published today, 03 September 2015, in the journal Nanotechnology (“Activated carbon derived from waste coffee grounds for stable methane storage”). [emphasis mine]

Methane capture and storage provides a double environmental return – it removes a harmful greenhouse gas from the atmosphere that can then be used as a fuel that is cleaner than other fossil fuels.

The process developed by the researchers, based at the Ulsan National Institute of Science and Technology (UNIST), South Korea, involves soaking the waste coffee grounds in sodium hydroxide and heating to 700-900 °C in a furnace. This produced a stable carbon capture material in less than a day – a fraction of the time it takes to produce carbon capture materials.

I wonder if someone meant to embargo this news release as the paper isn’t due to be published until Thurs., Sept. 3, 2015.

In any event, the Institute of Physics (IOP) Sept. 1, 2015 news release on Alpha Galileo and elsewhere is making the rounds. Here’s more from the news release,

“The big thing is we are decreasing the fabrication time and we are using cheap materials,” explains Christian Kemp, an author of the paper now based at Pohang University of Science and Technology, Korea. “The waste material is free compared compared to all the metals and expensive organic chemicals needed in other processes – in my opinion this is a far easier way to go.”

Kemp found inspiration in his cup of coffee whilst discussing an entirely different project with colleagues at UNIST. “We were sitting around drinking coffee and looked at the coffee grounds and thought ‘I wonder if we can use this for methane storage?’” he continues.

The absorbency of coffee grounds may be the key to successful activation of the material for carbon capture. “It seems when we add the sodium hydroxide to form the activated carbon it absorbs everything,” says Kemp. “We were able to take away one step in the normal activation process – the filtering and washing – because the coffee is such a brilliant absorbant.”

The work also demonstrates hydrogen storage at cryogenic temperatures, and the researchers are now keen to develop hydrogen storage in the activated coffee grounds at less extreme temperatures.

Once the paper has been published I will return to add a link to and a citation for it.

ETA Sept. 3, 2015 (It seems I was wrong about the publication date):

Activated carbon derived from waste coffee grounds for stable methane storage by K Christian Kemp, Seung Bin Baek, Wang-Geun Lee, M Meyyappan, and Kwang S Kim. IOP Publishing Ltd • Nanotechnology, Volume 26, Number 38 doi:10.1088/0957-4484/26/38/385602) Published 2 September 2015 • © 2015

This is an open access paper.

Plus, there is a copy of the press release on EurekAlert.

Nanojuice in your gut

A July 7, 2014 news item on Azonano features a new technique that could help doctors better diagnose problems in the intestines (guts),

Located deep in the human gut, the small intestine is not easy to examine. X-rays, MRIs and ultrasound images provide snapshots but each suffers limitations. Help is on the way.

University at Buffalo [State University of New York] researchers are developing a new imaging technique involving nanoparticles suspended in liquid to form “nanojuice” that patients would drink. Upon reaching the small intestine, doctors would strike the nanoparticles with a harmless laser light, providing an unparalleled, non-invasive, real-time view of the organ.

A July 5, 2014 University of Buffalo news release (also on EurekAlert) by Cory Nealon, which originated the news item, describes some of the challenges associated with medical imaging of small intestines,

“Conventional imaging methods show the organ and blockages, but this method allows you to see how the small intestine operates in real time,” said corresponding author Jonathan Lovell, PhD, UB assistant professor of biomedical engineering. “Better imaging will improve our understanding of these diseases and allow doctors to more effectively care for people suffering from them.”

The average human small intestine is roughly 23 feet long and 1 inch thick. Sandwiched between the stomach and large intestine, it is where much of the digestion and absorption of food takes place. It is also where symptoms of irritable bowel syndrome, celiac disease, Crohn’s disease and other gastrointestinal illnesses occur.

To assess the organ, doctors typically require patients to drink a thick, chalky liquid called barium. Doctors then use X-rays, magnetic resonance imaging and ultrasounds to assess the organ, but these techniques are limited with respect to safety, accessibility and lack of adequate contrast, respectively.

Also, none are highly effective at providing real-time imaging of movement such as peristalsis, which is the contraction of muscles that propels food through the small intestine. Dysfunction of these movements may be linked to the previously mentioned illnesses, as well as side effects of thyroid disorders, diabetes and Parkinson’s disease.

The news release goes on to describe how the researchers manipulated dyes that are usually unsuitable for the purpose of imaging an organ in the body,

Lovell and a team of researchers worked with a family of dyes called naphthalcyanines. These small molecules absorb large portions of light in the near-infrared spectrum, which is the ideal range for biological contrast agents.

They are unsuitable for the human body, however, because they don’t disperse in liquid and they can be absorbed from the intestine into the blood stream.

To address these problems, the researchers formed nanoparticles called “nanonaps” that contain the colorful dye molecules and added the abilities to disperse in liquid and move safely through the intestine.

In laboratory experiments performed with mice, the researchers administered the nanojuice orally. They then used photoacoustic tomography (PAT), which is pulsed laser lights that generate pressure waves that, when measured, provide a real-time and more nuanced view of the small intestine.

The researchers plan to continue to refine the technique for human trials, and move into other areas of the gastrointestinal tract.

Here’s an image of the nanojuice in the guts of a mouse,

The combination of "nanojuice" and photoacoustic tomography illuminates the intestine of a mouse. (Credit: Jonathan Lovell)

The combination of “nanojuice” and photoacoustic tomography illuminates the intestine of a mouse. (Credit: Jonathan Lovell)

This is an international collaboration both from a research perspective and a funding perspective (from the news release),

Additional authors of the study come from UB’s Department of Chemical and Biological Engineering, Pohang University of Science and Technology in Korea, Roswell Park Cancer Institute in Buffalo, the University of Wisconsin-Madison, and McMaster University in Canada.

The research was supported by grants from the National Institutes of Health, the Department of Defense and the Korean Ministry of Science, ICT and Future Planning.

Here’s a link to and a citation for the paper,

Non-invasive multimodal functional imaging of the intestine with frozen micellar naphthalocyanines by Yumiao Zhang, Mansik Jeon, Laurie J. Rich, Hao Hong, Jumin Geng, Yin Zhang, Sixiang Shi, Todd E. Barnhart, Paschalis Alexandridis, Jan D. Huizinga, Mukund Seshadri, Weibo Cai, Chulhong Kim, & Jonathan F. Lovell. Nature Nanotechnology (2014) doi:10.1038/nnano.2014.130 Published online 06 July 2014

This paper is behind a paywall.