Home > Press > Bio-inspired Assembly of Nanoparticle Building Blocks
Rice University chemists have discovered how to assemble gold and silver nanoparticle building blocks into larger structures based on a novel method that harkens back to one of nature's oldest known chemical innovations the self-assembly of lipid membranes that surround all living cells. The
research appears in the Nov. 29 issue of the Journal of the American Chemical Society. It could help scientists design everything from better catalysts to potent new anti-cancer drugs.
Bio-inspired Assembly of Nanoparticle Building Blocks
Houston, Texas | Posted on November 27th, 2006
Bio-inspired Assembly of Nanoparticle Building Blocks
Nanoassembly Technique Draws On Lessons From Cell Membranes
Chemists at Rice University have discovered how to assemble gold and silver nanoparticle building blocks into larger structures based on a novel method that harkens back to one of nature's oldest known chemical innovations the self-assembly of lipid membranes that surround
every living cell.
The research appears in the Nov. 29 issue of the Journal of the American Chemical Society (JACS 2006, 128, 15098 http://pubs.acs.org/cgi-bin/article.cgi/jacsat/2006/128/i47/pdf/ja066708g.pdf).
Researchers believe the new method will allow them to create a wide variety of useful materials, including extra-potent cancer drugs and more efficient catalysts for the chemical industry.
The method makes use of the hydrophobic effect, a biochemical phenomena that all living creatures use to create membranes, ultra-thin barriers of fatty acids that form a strong yet dynamic sack around the cell, sealing it from the outside world. Cell membranes are one example of a micelle, a strong bilayer covering that is made of two sheets of lipid-based amphiphiles, molecules that have a water-loving, or hydrophilic, end, and a water-hating, or hydrophobic, end. Like two pieces of cellophane tape being brought together, the hydrophobic sides of the amphiphilic sheets stick to one another, forming the bilayered micelle.
"When the micelle forms, the process drives the packing of all the junction points, which connect the hydrophobic and the hydrophilic part of an amphiphile, into a high-density array," said Eugene Zubarev, the Norman Hackerman-Welch Young Investigator and assistant professor of chemistry. "By attaching a nanoparticle to the junction point of an amphiphile, we can, in effect, use micellization as a means to assemble billions and billions of individual nanoparticles into well-defined one-dimensional superstructures that are soluble in water."
Zubarev and colleagues synthesized V-shaped amphiphiles of polystyrene-b-poly(ethylene oxide) and attached two-nanometer diameter gold particles at the focal point of the V. Upon adding water and inducing micelle formation, the team found it could create tightly packed cylinders of gold nanoparticles measuring just 18 nanometers in diameter.
All micelles form in three allowable shapes spheres, cylinders and sack-like vesicles. By varying the length of the polystyrene arm, the solvents used and the size of the gold particles, Zubarev and colleagues were able to form spheres, vesicles and vary the diameter of their cylinders, some of which grew to well-over 1,000 nanometers in length.
"We believe further manipulation of these parameters may provide an opportunity to control the optical and catalytic properties of these nanoassemblies," Zubarev said.
The research was funded by the National Science Foundation and the Welch Foundation.
About Rice University
Rice University is consistently ranked one of America's best teaching and research universities. It is distinguished by its: size‹2,850 undergraduates and 1,950 graduate students; selectivity‹10 applicants for each place in the freshman class; resources‹an undergraduate student-to-faculty ratio of 6-to-1, and the fifth largest endowment per student among American universities; residential college system, which builds communities that are both close-knit and diverse; and collaborative culture, which crosses disciplines, integrates teaching and research, and intermingles undergraduate and graduate work. Rice's wooded campus is located in the nation's fourth largest city and on America's South Coast.
For more information, please click here
Copyright © Rice University
If you have a comment, please Contact
Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Nanotubes self-organize and wiggle: Evolution of a nonequilibrium system demonstrates MEPP February 10th, 2015
Engineering self-assembling amyloid fibers January 26th, 2015
Revealed: How bacteria drill into our cells and kill them December 2nd, 2014
Live Images from the Nano-cosmos: Researchers watch layers of football molecules grow November 5th, 2014
Scientific breakthrough in rechargeable batteries: Researchers from Singapore and Québec Team Up to Develop Next-Generation Materials to Power Electronic Devices and Electric Vehicles February 28th, 2015
First detailed microscopy evidence of bacteria at the lower size limit of life: Berkeley Lab research provides comprehensive description of ultra-small bacteria February 28th, 2015
Leti to Offer Updates on Silicon Photonics Successes at OFC in LA February 27th, 2015
Moving molecule writes letters: Caging of molecules allows investigation of equilibrium thermodynamics February 27th, 2015
2015 Nanonics Image Contest January 29th, 2015
OCSiAl supports NanoART Imagery Contest January 23rd, 2015
EnvisioNano: An image contest hosted by the National Nanotechnology Initiative (NNI) January 22nd, 2015
Oxford Instruments Asylum Research Announces AFM Image Contest Winners January 11th, 2015