Navigation Links
Engineers whip up the first long-lived nanoscale bubbles
Date:5/29/2008

Cambridge, Mass. -- May 29, 2008 -- With the aid of kitchen mixers, engineers at Harvards School of Engineering and Applied Sciences (SEAS) have whipped up, for the first time, permanent nanoscale bubbles bubbles that endure for more than a year from batches of foam made from a mixture of glucose syrup, sucrose stearate, and water. Their study appears in the May 30 issue of the journal Science.

The research, led by Howard A. Stone, had its origins in a conference talk on foams delivered by Dr. Rodney Bee, a retired Unilever physical chemist, in 2005. Bee, who had been researching ice cream for the food, beverage, and personal-care product company, was interested in finding ways to extend the life of foams and other gas-infused mixtures like ice cream. He had produced an unusual bubble formation in the course of his research, and he included a photograph of it in the presentation.

Stone, Vicky Joseph Professor of Engineering and Applied Mathematics and associate dean for applied physical sciences and engineering, was in the audience when Bee projected an image of a micrometer-size bubble with a distinctive polygonal geometry. The bubble surface appeared to be faceted with regular pentagonal, hexagonal, and heptagonal domains that intersected to form a soccer ball-like structure. None of the faces spanned more than 50 nanometers.

Small bubbles on that scale never last because of surface tension they instantly disappear. What Rodney showed on that screen was extraordinary, said Stone. It was impossible; we all thought it was impossible.

Smaller bubbles have a greater surface tension and a higher gas pressure than larger ones. As a result, larger bubbles usually grow at the expense of smaller ones, which have very short lifetimes.

I asked him how he created his foams, and he said he used an ordinary kitchen mixer. The next day I went out and bought a kitchen mixer for the lab, explained Stone.

The experimental study, conducted by SEAS graduate student Emilie Dressaire in collaboration with Unilever colleagues, revealed that when the bubbles were covered with the chosen surfactant mixture, the surfactant molecules crystallized to form nearly impermeable shells over the bubble surfaces.

The resulting shells possessed an elasticity that allowed them to buckle over time into a remarkably regular and stable pattern. Measurements of the microbubbles stability extended over more than a year, and the structural integrity of the bubbles held for the entire period.

The authors note that future applications of these microbubbles could significantly extend the lifetimes of common gas-liquid products that experience rapid disintegration, such as aerated personal-care products and contrast agents for ultrasound imaging.


'/>"/>

Contact: Michael Patrick Rutter
mrutter@seas.harvard.edu
617-496-3815
Harvard University
Source:Eurekalert  

Related biology technology :

1. Engineers demonstrate first room-temperature semiconductor source of coherent Terahertz radiation
2. Nanowires may boost solar cell efficiency, UC San Diego engineers say
3. Engineers harness cell phone technology for use in medical imaging
4. Engineers make first active matrix display using nanowires
5. Surface dislocation nucleation: Strength is but skin deep at the nanoscale, Penn engineers discover
6. Cardiff University engineers give industry a moths eye view
7. Harvard University engineers demonstrate quantum cascade laser nanoantenna
8. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
9. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
10. First Taxane-Based Non-Anthracycline Containing Chemotherapy in Combination With Herceptin (TCH) for HER2 Positive Early Breast Cancer Patients Obtains Approval From the FDA
11. Genmab Announces 2008 First Quarter Results
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Engineers whip up the first long-lived nanoscale bubbles
(Date:4/27/2016)... ... April 27, 2016 , ... The Board of ... appointment of John Tilton as Chief Commercial Officer.  Mr. Tilton joined Biohaven from ... founding commercial leaders responsible for the commercialization of multiple orphan drug indications. ...
(Date:4/27/2016)... ... ... Global Stem Cells Group CEO Benito Novas announced that Duncan Ross, Ph.D. ... Labs in Miami. , In 2004, Ross received his Ph.D. in Immunology from the ... the suppression of graft vs. host disease (GVHD) under UM Professor Robert Levy Ph.D. ...
(Date:4/26/2016)... ... April 27, 2016 , ... ... Roca Rothgerber Christie LLP as an associate in the firm’s Intellectual Property practice ... electrical, mechanical and electromechanical patent applications. He has an electrical engineering and computer ...
(Date:4/26/2016)... ... April 26, 2016 , ... Mr. Palmer created the RPO ... the first multi-million dollar, multi-year managed services contract in the U.S. intelligence community with ... our leadership team,” said John Younger, founder of Accolo. “We are growing and ...
Breaking Biology Technology:
(Date:3/3/2016)... and DE SOTO, Kansas , March ... Detection Plus® to offer Oncimmune,s Early CDT®-Lung, a ... early detection of lung cancer Early CDT®-Lung ... and individuals. --> Early CDT®-Lung test to ... --> Oncimmune, a leader in early cancer ...
(Date:3/2/2016)... 2, 2016 http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ... "Global Biometrics as a Service Market ... --> http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced ... as a Service Market 2016-2020" report ... Research and Markets ( http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has ...
(Date:3/1/2016)... FRANCISCO , March 1, 2016  (RSAC Booth ... year, but a whopping $118 billion is lost to ... to overzealous and inaccurate fraud detection. At the RSA ... in the way companies handle authentication by devaluing the ... and behavioral analytics. --> ...
Breaking Biology News(10 mins):