Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Synthesis of cage-like silica structure easier and cheaper

16.09.2003


A tailored, cage-like silica structure, developed by Penn State researchers, is easier and less expensive to make than previous materials and is tunable in size.



"Previous attempts at synthesizing materials like PSU-1 involved specially designed templates making the process expensive," says Dr. Sridhar Komarneni, professor of clay mineralogy. "The processes also require stringent conditions for the synthesis to work." Komarneni, working with Dr. Bharat L. Newalkar, postdoctoral fellow in Penn State’s Materials Research Institute; Uday T. Turaga, graduate student in the fuel science program and geoenvironmental engineering; and Dr. Hiroaki Katsuki of Saga Ceramics Research Laboratory, Japan, used a hybrid mechanism to synthesize the same product.

"We believe that this approach has the potential to result in new synthetic strategies for tailoring new framework compositions for specific applications in the fields of catalysis, adsorption, and nanotechnology," the researchers reported at the recent American Chemical Society annual meeting in New York and in the Journal of Materials Chemistry.


Silica materials similar to PSU-1 exist and are small particles with nanoscopic pores. Some have hexagonal, close-packed pores. Others are cubic with three-dimensional linkages. These tailored materials, which appear powder like, are usually created by producing a template in the shape of the required pore. The silica forms around the template, which is then removed either with organic solvents or by heating until the template material calcines.

PSU-1 has a more complex pore structure than cubic or hexagonal. The pore, referred to as a cage, has a central large hollow area with smaller tubes connecting the central pore spaces. Manufacturing a template to create this structure is possible, but expensive and time-consuming.

"We prepared two gels and two templates and mixed them together to see what kind of material might come up with this hybrid template," says Komarneni. "We were surprised to get a really new structure, not like the two starting structures."

The two sets of templates and gels mixed together – one forms large pores and one forms small pores – created the cage-like structure. Altering the size of the templates alters the sizes of the pores, which have sizes of 4.6 and 5.4 nanometers, while the powders are 30 to 40 micrometers in diameter.

The researchers add another twist by using microwaves to synthesize the material in liquid. Microwaving takes a much shorter time than conventional heating techniques, creates a more stable material and the 30 to 40 micrometer particles are much bigger than the previously produced 1 to 2 micrometer particles.

"We can tell it is a cage with passageway structure because very small molecules will block the flow through the particles and that will not happen in the hexagonally arranged pores of a silica particle," says Komarneni. "What we do not know is how many tubes branch off from each central cage."


###
The National Science Foundation-supported Penn State Materials Research Science and Engineering Center supported this work.

A’ndrea Elyse Messer | EurekAlert!
Further information:
http://www.psu.edu/

More articles from Materials Sciences:

nachricht Let the good tubes roll
19.01.2018 | DOE/Pacific Northwest National Laboratory

nachricht Method uses DNA, nanoparticles and lithography to make optically active structures
19.01.2018 | Northwestern University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Let the good tubes roll

19.01.2018 | Materials Sciences

How cancer metastasis happens: Researchers reveal a key mechanism

19.01.2018 | Health and Medicine

Meteoritic stardust unlocks timing of supernova dust formation

19.01.2018 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>