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 Decoding cement's shape promises greener concrete
08.12.2016 | Rice University

nachricht Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D
08.12.2016 | DOE/Brookhaven 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: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Closing the carbon loop

08.12.2016 | Life Sciences

Applicability of dynamic facilitation theory to binary hard disk systems

08.12.2016 | Physics and Astronomy

Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D

08.12.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>