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 Researchers printed graphene-like materials with inkjet
18.08.2017 | Aalto University

nachricht Superconductivity research reveals potential new state of matter
17.08.2017 | DOE/Los Alamos National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

A Map of the Cell’s Power Station

18.08.2017 | Life Sciences

Engineering team images tiny quasicrystals as they form

18.08.2017 | Physics and Astronomy

Researchers printed graphene-like materials with inkjet

18.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>