HOME >> BIOLOGY >> NEWS
MITs smart surface switches properties reversibly

anger, Lahann and Tran, other authors of the Science paper are former undergraduate Hiroki Kaido and former postdoctoral associate Insung S. Choi (both in chemical engineering); Samir Mitragotri and Jagannathan Sundaram of the University of California at Santa Barbara (Mitragotri is a former chemical engineering Ph.D. and postdoctoral associate); and Saskia Hoffer and Gabor A. Somorjai of the University of California at Berkeley.

MOLECULAR FOREST
The new switchable surface essentially consists of a forest of molecules only a billionth of a meter tall, engineered to stand at a precise distance from each other. In this particular case, the team makes the top of each molecule negatively charged and hydrophilic (water-loving), and the trunk positively charged and hydrophobic (water-repelling).

When a positive electrical potential is applied, the induced attractive force causes the top to bend down. The resulting loop that is now exposed is hydrophobic. Reverse the electrical potential and the molecules will straighten to their full height, the hydrophilic tops once more attracting water. Look at your hand, Langer explained. Imagine that your fingertips have property A and your knuckles have property B. Weve created a reversible way to move those fingers up and down, exposing either the fingertips or the knuckles with their different properties.

ADDING HATS
One important challenge for the team was finding a way to create a molecular forest, or self-assembled monolayer (SAM), with enough space between molecules to allow each to bend down. Conventional SAMs are characterized by very dense assemblies of molecules so tightly packed together that they have no room to move.

The MIT engineers solved the problem by adding bulky hats to each molecule during the assembly of the SAM, creating the equivalent of a field of molecular mushrooms. By then removing the hats, we ended up with a low-density monola
'"/>

Contact: Elizabeth Thomson
thomson@mit.edu
617-258-5402
Massachusetts Institute of Technology
16-Jan-2003


Page: 1 2 3

Related biology news :

1. Study of flu patients reveals virus outsmarting key drug
2. Muscles are smarter than you think
3. Purdue scientists finding ways to outsmart crop-damaging bugs
4. With natures help, a better vision system for smart weapons
5. UCSD researchers fabricate tiny smart dust particles
6. Scientists at the Scripps Research Institute design gene-tipped tumor regressor smartbombs
7. Researchers developing technology to outsmart metastasized cancers
8. How did we get so smart? Study sheds light on evolution of the brain
9. Pharmaceutical smart bomb targets cancer cells
10. Female birds choose best singers to have smarter offspring
11. Prosthetic limb to be controlled by microchip: Agreement signed to create smart leg

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/22/2016)... ANGELES , June 22, 2016 /PRNewswire/ ... identity management and verification solutions, has partnered ... edge software solutions for Visitor Management, Self-Service ... provides products that add functional enhancements ... partnership provides corporations and venues with an ...
(Date:6/20/2016)... , June 20, 2016 Securus Technologies, ... technology solutions for public safety, investigation, corrections and ... prisons involved, it has secured the final acceptance ... facilities for Managed Access Systems (MAS) installed. Furthermore, ... facilities to be installed by October, 2016. MAS ...
(Date:6/9/2016)... 9, 2016  Perkotek an innovation leader in attendance control systems is proud to ... hours, for employers to make sure the right employees are actually signing in, and ... ... ... ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... , June 27, 2016  Liquid Biotech ... the funding of a Sponsored Research Agreement with ... tumor cells (CTCs) from cancer patients.  The funding ... CTC levels correlate with clinical outcomes in cancer ... data will then be employed to support the ...
(Date:6/24/2016)... 24, 2016  Regular discussions on a range of subjects ... the two entities said Poloz. Speaking at a ... , he pointed to the country,s inflation target, which ... "In certain areas ... have common economic goals, why not sit down and address ...
(Date:6/24/2016)... NY (PRWEB) , ... June 24, 2016 , ... While ... machines such as the Cary 5000 and the 6000i models are higher end machines ... is the height of the spectrophotometer’s light beam from the bottom of the cuvette ...
(Date:6/23/2016)... WA (PRWEB) , ... June 23, 2016 , ... ... announces the release of its second eBook, “Clinical Trials Patient Recruitment and Retention ... recruitment and retention in this eBook by providing practical tips, tools, and strategies ...
Breaking Biology Technology:
Cached News: