Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > CCNY Chemical Engineering Seminar: Self-Assembled Systems of Nanoparticles: Surprising Analogies with Proteins and New Optical Properties

Abstract:
Oct 27, 2008
2:00 PM
Refreshments will be served.
City College of New York, 160 Convent Avenue, Steinman Hall, Rm. 312
phone (212) 650-7232

CCNY Chemical Engineering Seminar: Self-Assembled Systems of Nanoparticles: Surprising Analogies with Proteins and New Optical Properties

New York, NY | Posted on October 26th, 2008

Professor Nicholas Kotov, from the University of Michigan, speaks on the topic of: Self-Assembled Systems of Nanoparticles: Surprising Analogies with Proteins and New Optical Properties.

ABSTRACT

Figure 1: (A) Schematics of the system of CdTe NWs and Au NPs with plasmon-exciton interactions. (B) Calculated geometry of self-organized CdTe sheets with hexagonal packing. closely matching the experiment. A B Surface chemistries of nanoparticles and proteins reveal a lot of similarities which can also be traced in chemical and biological behavior starting from processing techniques to cell signaling. In this presentation they will be reviewed and compared. Special attention will be given self-organization phenomena taking place with semiconductor nanocolloids starting with supercrystals from nearly spherical nanoparticles and nanoparticle bioconjugates to 1D and 2D assemblies. Comparison of the processes in solution of CdTe and other nanocolloids reveals a number of surprising similarities with processes in proteins. The conclusion that will be reached that this is the result of fundamental analogy in the scales between proteins and nanoparticles. This conclusion will be substantiated by a variety of experimental and theoretical observations of analogies between biological effects of nanoparticles and proteins. In essence, the talk will show that anisotropic forces arising between nanocrystalline particles drive the self-assembly behavior of these colloidal particles. Interaction anisotropy between CdTe nanoparticles in solution leads to their spontaneous, template-free organization into free-floating sheets. Electrostatic interactions arising from a dipole moment and a small positive charge combined with directional hydrophobic attraction between the nanoparticles are the driving forces for the self-assembly, which we demonstrate by computer simulation. The laws governing this process show conceptual similarities with assembly of proteins. Electronic interactions in nanoparticle assemblies represent one of the fundamental problems of nanotechnology. Excitons and plasmons are the two most typical excited states of nanostructures, which were shown to produce coupled electronic systems. The concept of these interactions between the Au and CdTe nanoparticles and nanowires will be discussed in terms of quantum mechanical coupling of excited states and unusual optical effects. As such, in presence of dynamic component for excitons theory predicts that emission of coupled excitations in nanowires with variable electronic confinement is stronger, shorter, and blue-shifted. These predictions were confirmed with high degree of accuracy in molecular spring assemblies, where one can reversibly change the distance between the exciton and plasmon. The prepared systems were made protein-sensitive by incorporating antibodies in molecular springs. Modulation of exciton-plasmon interactions can serve as wavelength-based biodetection tool, which can resolve difficulties of quantification of luminescence intensity for complex media and optical pathways. Relevant References. Z. Tang, N. A. Kotov, M. Giersig, Science 2002, 297, 237-240. Tang, Z. Zhang, Z.; Wang Y.; Glotzer, S. C. Kotov, N. A., Science, 2006, 314 (5797) 274-278. Sinyagin, A. Belov, A. Tang, Z. Kotov. N. A. J. Phys. Chem. B 2006, 110(14), 7500-7507 J. Lee, A. O. Govorov, N. A. Kotov, Angew. Chem. Intern. Ed. 2005, 44, 7439-7442. J. Lee, A. O. Govorov, J. Dulka, N. A. Kotov, Nano Lett. 2004, 4, 2323-2330. J. Lee, A. O. Govorov, N. A. Kotov, Nature Materials. 2007, 6(4), 291-295.
Refreshments will be served.

####

About NYAS.org
Founded in 1817, the New York Academy of Sciences is an independent, nonprofit organization with more than 25,000 members in 140 countries. The Academy fulfills its mission through the following efforts:

The Conferences Program sponsors 8-12 major events annually, bringing together international groups of speakers to exchange information on basic or applied frontier research fields and on the broader societal roles of science and technology.

The Frontiers of Science Program convenes senior investigators and young scientists regularly in multi-speaker, interdisciplinary discussion groups to explore ideas and exchange information in the biological, chemical, and computational sciences.

The Physical Sciences & Engineering Program provides a forum for the exchange of new ideas and data in interdisciplinary areas such as machine learning, green science and sustainability, quantitative finance, string theory, and astrophysics and cosmology.

The Science Alliance for Graduate Students and Postdocs is a collaboration among 30 universities and other scientific institutions in the United States and around the world that provides guidance on careers, networking, and mentoring for 5000 young investigators.

Scientists Without BordersSM mobilizes and coordinates science-based efforts in the developing world to improve health care, foster agricultural progress, promote environmental well-being, and devise energy solutions.

The Committee on the Human Rights of Scientists fights on behalf of scientists, health professionals, engineers, and educators who have been detained, imprisoned, exiled, or deprived of the right to pursue science.

The Academy's International Programs include partnerships with the major universities in the United Kingdom and the Chinese Ministry of Health, and programs in the United Arab Emirates and Mexico City.

For more information, please click here

Copyright © NYAS.org

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

'Find the Lady' in the quantum world: International team of researchers presents method for quantum-mechanical swapping of positions October 18th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Self Assembly

Physicists gain new insights into nanosystems with spherical confinement: Enormous potential for the targeted delivery of pharmaceutical agents and the creation of tailored nanoparticles July 27th, 2017

Oddball enzyme provides easy path to synthetic biomaterials May 17th, 2017

Nanotubes that build themselves April 14th, 2017

Nanocages for gold particles: what is happening inside? March 16th, 2017

Announcements

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Rice U. study: Vibrating nanoparticles interact: Placing nanodisks in groups can change their vibrational frequencies October 16th, 2017

Events/Classes

Nanometrics Announces Preliminary Results for the Third Quarter of 2017: Quarterly Results Impacted by Delays in Revenue Recognition on Multiple Systems into Japan October 12th, 2017

More 22 of 59,885 Print all In new window Leti to Present Update of CoolCube/3DVLSI Technologies Development at 2017 IEEE S3S: Future Developments and Tape-Out Vehicles to Be Presented during Oct. 17 Workshop October 12th, 2017

Arrowhead Pharmaceuticals to Present Preclinical Data on ARO-AAT at The Liver Meeting(R) October 10th, 2017

Arrowhead to Present at Chardan Gene Therapy Conference October 3rd, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project