Navigation Links
NJIT engineer discovers why particles disperse on liquids
Date:11/17/2009

Even if you are not a cook, you might have wondered why a pinch of flour (or any small particles) thrown into a bowl of water will disperse in a dramatic fashion, radiating outward as if it was exploding. Pushpendra Singh, PhD, a mechanical engineering professor at NJIT who has studied and written about the phenomenon, has not only thought about it, but can explain why.

He says that what's known as the "repulsive hydrodynamic force arising from the oscillation of particles" causes them to disperse. A particle trapped in a liquid surface vibrates up and down from its equilibrium position on the surface, or interface, where air meets water. When many particles do this simultaneously, an explosive dispersion occurs.

"Spontaneous Dispersion of Particles on Liquid Surfaces," which appeared in the Nov. 11, 2009 early edition of the Proceedings of the National Academy of Sciences explains the theory. The National Science Foundation has supported this research.

Singh says that when small particles, such as flour or pollen, come in contact with a liquid surface, they immediately disperse and form a monolayer. The dispersion occurs so quickly that it appears explosive, especially on the surface of liquids like water.

This explosive dispersion is a consequence of the capillary force pulling particles towards their equilibrium positions in the interface. The capillary force causes the particles to accelerate very rapidly.

"If a particle barely touches the interface, it is pulled onto the surface," said Singh. "For example, if the contact angle for a spherical particle is 90 degrees, it floats in the state of equilibrium so that one-half of it is above the surface and the remaining half is below. If the particle, however, is not in this position, the capillary force will force it to be."

What's interesting is that the smaller the particles, the faster they move. For nanometer-sized particles like vi
'/>"/>

Contact: Sheryl Weinstein
Sheryl.m.weinstein@njit.edu
973-596-3436
New Jersey Institute of Technology
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Avoiding dangerous climate change: Is geo-engineering the answer?
2. Genencor Wins The American Institute of Chemical Engineers (AIChE) Sustainable Energy Award For Accellerase(R) Cellulosic Ethanol Enzymes
3. Engineering Careers for the Next Generation, Nov. 18
4. Battling cancer with engineering: NCI funds new $13 million cancer research center led by Cornell
5. Clemson bioengineer uses nanoparticles to target drugs
6. CHEO RI study uses sophisticated genetic engineering to improve insulin-producing beta cells
7. Louisiana Tech University receives grant to advance women in engineering, science
8. Yale engineers track bacterias kayak paddle-like motion for first time
9. Siebel Foundation awards top UC San Diego bioengineering graduate students
10. Boston University engineer to use $2.5 million NIH grant to cells reaction to physical force
11. Sakayu Shimizu of Kyoto University recipient of 2009 Enzyme Engineering Award
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NJIT engineer discovers why particles disperse on liquids
(Date:7/23/2015)... Research and Markets ( http://www.researchandmarkets.com/research/rzzp3v/global_outlook_of ) ... Outlook of the Biometrics Industry 2015 " ... global biometrics market is likely to witness significant ... to the uptake of multiple technologies available. The ... the growth of biometrics in existing applications as ...
(Date:7/13/2015)... 13, 2015 Synaptics Inc. (NASDAQ: ... solutions, today announced sampling of ClearPad ® ... integration (TDDI) product targeting smartphones and tablets. This ... Synaptics , best-in-class touch controller IP and ... developed in the company,s Japan Design Center. TDDI ...
(Date:7/9/2015)... JOSE, Calif. , July 9, 2015 ... the leading developer of human interface solutions, ... technology, the industry,s first fully hardware encapsulated ... Match-in-Sensor secure authentication technology is literally off ... storage and biometric matching within the fingerprint ...
Breaking Biology News(10 mins):Global Outlook of the Biometrics Industry 2015 2Global Outlook of the Biometrics Industry 2015 3Synaptics Announces Sampling of Second Generation TDDI Solutions 2Synaptics Announces Sampling of Second Generation TDDI Solutions 3Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 2Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 3
... moving purple sea urchin may look oblivious, lacking a ... impressive suite of sensory receptors to detect outside signals. ... much more ammunition to activate its innate immune system ... coastal areas that face increasing pollution, and it is ...
... Science conference, an international event that brings together the world,s ... science is a new way of looking at the world ... function in medicine to preventing the failure of networks such ... public facilities. "There are similarities in the way ...
... fillings also may stunt tumor growth, Medical College of ... blue-violet light to the composite, which triggers hardening," says ... "The light waves produce free radicals that activate the ... In oral cancer cells, though, those radicals cause damage ...
Cached Biology News:Genomics of large marine animals showcased in the biological bulletin 2Genomics of large marine animals showcased in the biological bulletin 3Blue light used to harden tooth fillings stunts tumor growth 2
(Date:7/31/2015)... LAS VEGAS , July 31, 2015 /PRNewswire/ ... pharmacists seek resources that help them drive positive ... as a vital source of patient care in ... Pharmacy,s annual tradeshow and conference, AmerisourceBergen announced ... strengthen its Pharmacy Services Administration Organization and help ...
(Date:7/31/2015)... ... July 31, 2015 , ... Global Resorcinol Market ... industry insights on the global resorcinol industry. The report highlights the various growth ... market scenarios and analysis of primary and secondary inputs from the existing players ...
(Date:7/31/2015)... 31, 2015 China Cord Blood Corporation (NYSE: ... leading provider of cord blood collection, laboratory testing, ... today announced that the Company has filed its Annual ... Exchange Commission. The filed Form 20-F includes audited financial ... The Form 20-F can be accessed by visiting the ...
(Date:7/31/2015)... ... July 31, 2015 , ... R-Biopharm ... quantification of partially hydrolyzed gluten in foods, has been accepted by AOAC International ... “Partially Hydrolyzed Gluten in Fermented Cereal-Based Products by R5 Competitive ELISA,” based on ...
Breaking Biology Technology:AmerisourceBergen Unveils Suite of Enhanced Capabilities for Independent Pharmacies at ThoughtSpot 2015 2AmerisourceBergen Unveils Suite of Enhanced Capabilities for Independent Pharmacies at ThoughtSpot 2015 3Resorcinol Market to Grow at 6% CAGR to 2019 Says New Research Report at ReportsnReports.com 2Resorcinol Market to Grow at 6% CAGR to 2019 Says New Research Report at ReportsnReports.com 3Resorcinol Market to Grow at 6% CAGR to 2019 Says New Research Report at ReportsnReports.com 4China Cord Blood Corporation Files Its Annual Report on Form 20-F 2RIDASCREEN® Competitve Gliadin Receives AOAC Official First Action Status 2
... UPTON, NY - In a step toward engineering ... of Energy,s (DOE) Brookhaven National Laboratory have assembled ... miniaturized power sources. Composed of light-absorbing, colloidal quantum ... two-particle systems can convert light to electricity in ...
... SAN FRANCISCO, May 10, 2011 Date: ... ranking the 500 fastest growing technology, media, telecommunications, life sciences, and ... of the Technology Fast 500™. What:   Nominations ... revenue growth over fiscal years 2006 to 2010.  To be eligible ...
... May 10, 2011 DATATRAK International, Inc. (OTCQX: DATA), ... solutions for the clinical trials industry, today announces the ... with Durham Technical Community College (DTCC) to license its ... use the eClinical software in its Clinical Trials Research ...
Cached Biology Technology:Pairing quantum dots with fullerenes for nanoscale photovoltaics 2Pairing quantum dots with fullerenes for nanoscale photovoltaics 3Deloitte Seeks Nominations for 2011 Technology Fast 500™ Ranking 2DATATRAK Academy Expands to Include Durham Technical Community College 2DATATRAK Academy Expands to Include Durham Technical Community College 3
... were designed for full-length gene cloning and ... identify the desired cDNA clone. The first ... "Master Plate," where each well contains plasmid ... positive well(s) by gel electrophoresis of the ...
... R.A.P.I.D. System (Ruggedized Advanced Pathogen Identification ... thermocycler designed for field hospitals, mobile ... addition to its ruggedness, it is ... specify as the LightCycler instrument. By ...
... The Rapid-Screen cDNA Library Panels were designed ... three sets of PCRs to identify the ... is performed in a 96-well "Master Plate," ... 5,000 clones. Having identified the positive well(s) ...
... Analysis Note: Evaluated for its amino acid acceptor ... amino acids Ala, Asp, Gly, Ile, Lys, Pro, ... Tyr. Preparation Unit Definition: One unit will yield ... ml of water (1 cm light path). ...
Biology Products: