XML Feed for RxPG News   Add RxPG News Headlines to My Yahoo!   Javascript Syndication for RxPG News

Research Health World General
 
  Home
 
 Latest Research
 Cancer
 Psychiatry
 Genetics
 Surgery
 Aging
 Ophthalmology
 Gynaecology
 Neurosciences
 Pharmacology
 Cardiology
 Obstetrics
 Infectious Diseases
 Respiratory Medicine
 Pathology
 Endocrinology
 Immunology
 Nephrology
 Gastroenterology
 Biotechnology
  Drug Delivery
  Nanotechnology
 Radiology
 Dermatology
 Microbiology
 Haematology
 Dental
 ENT
 Environment
 Embryology
 Orthopedics
 Metabolism
 Anaethesia
 Paediatrics
 Public Health
 Urology
 Musculoskeletal
 Clinical Trials
 Physiology
 Biochemistry
 Cytology
 Traumatology
 Rheumatology
 
 Medical News
 Health
 Opinion
 Healthcare
 Professionals
 Launch
 Awards & Prizes
 
 Careers
 Medical
 Nursing
 Dental
 
 Special Topics
 Euthanasia
 Ethics
 Evolution
 Odd Medical News
 Feature
 
 World News
 Tsunami
 Epidemics
 Climate
 Business
Search

Last Updated: Aug 19th, 2006 - 22:18:38

Biotechnology Channel
subscribe to Biotechnology newsletter

Latest Research : Biotechnology

   DISCUSS   |   EMAIL   |   PRINT
Light-sensitive particles change chemistry at the flick of a switch
Mar 27, 2006, 16:37, Reviewed by: Dr. Priya Saxena

"These light-responsive systems will enable novel assembly routes for creating colloidal structures in a variety of materials,"

 
A light-sensitive, self-assembled monolayer that provides unique control over particle interactions has been developed by scientists at the University of Illinois at Urbana-Champaign. Particles coated with the monolayer change their surface charge and chemistry upon exposure to ultraviolet light.

"Tailoring interactions between particles allows us to design colloidal fluids, gels and crystals for use as ceramic, photonic and pharmaceutical materials," said Jeffrey Moore, a William H. and Janet Lycan Professor of Chemistry and a researcher at the Frederick Seitz Materials Research Laboratory and at the Beckman Institute for Advanced Science and Technology. "We are assembling a toolkit of molecules that can be incorporated as monolayers on particles to achieve desired effects."

Light-induced modification of colloidal interactions provides an 'extra handle' for tailoring system behavior, said Jennifer Lewis, the Thurnauer Professor of Materials Science and Engineering and interim director of the Frederick Seitz Materials Research Laboratory.

"The monolayer is designed so that light triggers the cleavage of a specific chemical bond, thereby exposing an underlying functional group of interest," said Lewis, who also is a professor of chemical and biomolecular engineering and a researcher at the Beckman Institute.

Moore and Lewis first demonstrated the technique in a paper published in the Sept. 30, 2005, issue of the Journal of the American Chemical Society. In that work, the surface charge and, thus, the electrostatic interactions between photosensitive silica microspheres, were modified by exposure to ultraviolet light.

In recent work, the researchers documented the gel-to-fluid transition in binary mixtures that initially were oppositely charged. "Exposure to ultraviolet light rendered all of the particles negative and converted the system into a colloidal fluid that settled to form a dense sediment," said Moore, who will present the team's findings at the national meeting of the American Chemical Society, to be held in Atlanta, March 26-30.

"These light-responsive systems will enable novel assembly routes for creating colloidal structures in a variety of materials," Lewis said. "We are currently investigating the ability to locally photo-pattern such assemblies in three dimensions without requiring multiple processing steps."

Light-sensitive colloidal particles could also be used to "tune" the elastic properties, viscous response and microstructure of gel-based inks used in the direct-write assembly of complex, three-dimensional structures formed by robotic deposition.

The Moore group is developing multiple wavelength-specific triggers that would allow different wavelengths of light to induce changes sequentially.
 

- National meeting of the American Chemical Society, to be held in Atlanta, March 26-30.
 

www.uiuc.edu

 
Subscribe to Biotechnology Newsletter
E-mail Address:

 

The U.S. Department of Energy and the National Science Foundation funded the work.

Related Biotechnology News

Gold Nanoparticle Molecular Ruler to Measure Smallest of Life’s Phenomena
Tiny inhaled particles take easy route from nose to brain
DNA Amplification and Detection Made Simple
Solitons Could Power Artificial Muscles
Nanoparticles could deliver multi-drug therapy to tumors
Nanotechnology can identify disease at early cellular level
Light-sensitive particles change chemistry at the flick of a switch
DNA Fragments for Making Tomatoes Taste Better Identified
'Custom' nanoparticles could improve cancer diagnosis and treatment
Human albumin from tobacco plants


For any corrections of factual information, to contact the editors or to send any medical news or health news press releases, use feedback form

Top of Page

 

© Copyright 2004 onwards by RxPG Medical Solutions Private Limited
Contact Us