Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Gold Nanoparticle Catalyst that Learns from Enzyme in Nature

16.11.2012
A team led by Dr. Kazushi Miki, Group Leader of the Functional Heterointerface Group, Polymer Materials Unit, National Institute for Materials Science succeeded in development of a high activity gold nanoparticle catalyst that simplify the function of enzyme in capturing substances.
A team led by Dr. Kazushi Miki, Group Leader of the Functional Heterointerface Group, Polymer Materials Unit (Unit Director: Izumi Ichinose), National Institute for Materials Science (President: Sukekatsu Ushioda) succeeded in development of a high activity gold nanoparticle catalyst that simplify the function of enzyme in capturing substances.

This new type of catalyst mimics enzyme, which supports biological activities as a catalyst in the reactions of the living body. Metalloenzymes has metal element which functions as a catalyst in the active center, and manifest extremely high activity and selectivity by possessing a function in which proteins surrounding the vicinity capture designated substances at activity sites. The NIMS group succeeded in realizing catalytic activity similar to that of metalloenzymes by simplifying the structure of these metalloenzymes in gold nanoparticles coated with alkanethiol molecules.

In this work, the NIMS research group focused on the fact that a self-assembled alkanethiol monolayer formed on the surface of gold nanoparticles (AuNP) possesses an interaction similar to that of cell membranes (lipid bilayer), which capture molecules of designated lengths and shapes. Because the molecules which are captured on the particle surface by this interaction increase the probability of contact with the gold particle surface, which has a catalytic function, the catalytic reaction is accelerated. Concretely, a high activity catalytic reaction was discovered, in which silane molecules are efficiently activated on the surface of gold, which is a catalyst, by capture of silane molecules and alcohol molecules on the surface of the gold particles.

As this result confirmed the mechanism of a catalytic reaction similar to that of metalloenzymes, it is expected to be possible to realize catalysts with a combination of high activity and high selectivity by designing modified molecules for AuNP. Furthermore, unlike natural enzyme, which can only be used stable in aqueous solutions, AuNP display extremely high chemical stability, enabling use under acidic and basic solution conditions and in organic solvents. Thus, there are no restrictions on industrial use.

This research was carried out as part of the research subject “Spatial and Temporal Integration of Near Field Reinforced Photochemical Reactions” (FY 2010-2012; Research Representative: Kazushi Miki) in the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Grants in Aid for Scientific Research on Innovative Areas research field “Organic Synthesis Based on Reaction Integration: Development of New Methods and Creation of New Substances” (Area Representative: Jun-ichi Yoshida, Professor, Kyoto University Graduate School of Engineering;

Fig : Schematic diagram of the new catalyst (a) The new catalyst has a structure in which gold nanoparticles (AuNP) having a size of 10nm (1/100 millionth of 1m) coated with alkanethiol are regularly arranged on a flat substrate. (b) In this scanning electron microscope image, it can be understood that the actual size of the AuNP is 9.0nm, and the gap between the AuNP is 2.4nm.

http://www.sbchem.kyoto-u.ac.jp/syuuseki/index ).

A patent application has already been filed in connection with this research.

These results will soon be published in the journal of Advanced Materials (Wiley).

Mikiko Tanifuji | Research asia research news
Further information:
http://www.nims.go.jp/eng/
http://www.researchsea.com

More articles from Materials Sciences:

nachricht InLight study: insights into chemical processes using light
05.12.2016 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Physics, photosynthesis and solar cells
01.12.2016 | University of California - Riverside

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

Robot on demand: Mobile machining of aircraft components with high precision

06.12.2016 | Power and Electrical Engineering

A new dead zone in the Indian Ocean could impact future marine nutrient balance

06.12.2016 | Earth Sciences

Significantly more productivity in USP lasers

06.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>