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:6/24/2016)... ... 2016 , ... While the majority of commercial spectrophotometers and fluorometers use the ... models are higher end machines that use the more unconventional z-dimension of 20mm. ... the bottom of the cuvette holder. , FireflySci has developed several Agilent flow ...
(Date:6/23/2016)... 2016 /PRNewswire/ - FACIT has announced the creation ... biotechnology company, Propellon Therapeutics Inc. ("Propellon" or "the ... a portfolio of first-in-class WDR5 inhibitors for the ... WDR5 represent an exciting class of therapies, possessing ... for cancer patients. Substantial advances have been achieved ...
(Date:6/23/2016)... , June, 23, 2016  The Biodesign Challenge ... envision new ways to harness living systems and biotechnology, ... Art (MoMA) in New York City ... 130 participating students, showcased projects at MoMA,s Celeste Bartos ... Paola Antonelli , MoMA,s senior curator of architecture and ...
(Date:6/23/2016)... , June 23, 2016 Apellis ... Phase 1 clinical trials of its complement C3 ... single and multiple ascending dose studies designed to ... (PD) of subcutaneous injection in healthy adult volunteers. ... (SC) either as a single dose (ranging from ...
Breaking Biology Technology:
(Date:4/13/2016)...  IMPOWER physicians supporting Medicaid patients in ... standard in telehealth thanks to a new partnership with ... IMPOWER patients can routinely track key health measurements, such ... and, when they opt in, share them with IMPOWER ... local retail location at no cost. By leveraging this ...
(Date:3/31/2016)...  Genomics firm Nabsys has completed a financial  restructuring ... , M.D., who returned to the company in October ... team, including Chief Technology Officer, John Oliver , ... and Vice President of Software and Informatics, Michael ... Dr. Bready served as CEO of Nabsys from 2005-2014 ...
(Date:3/23/2016)... 23, 2016 ... Gesichts- und Stimmerkennung mit Passwörtern     ... MESG ), ein führender Anbieter digitaler ... mit SpeechPro zusammenarbeitet, um erstmals dessen Biometrietechnologie ... die Möglichkeit angeboten, im Rahmen mobiler Apps ...
Breaking Biology News(10 mins):