Navigation Links
Open microfluidic and nanofluidic systems

contact line is visible in the upper right image in Figure 1. In such a situation, the contact angle is not determined by the classical Young equation but can vary over a wide range of values.

A surprising prediction of the new theory is that the experimentally observed polymorphism of the wetting liquid depends only on two parameters: (i) the channel geometry, i.e., the ratio of the channel depth to the channel width; and (ii) the interaction between substrate material and liquid. One has to distinguish seven different liquid morphologies which involve localized droplets (D), extended filaments (F), and thin wedges (W) at the channel corners. For microfluidics applications, the most important morphology regime is (F) which corresponds to stable filaments. Since this regime covers a relatively small region of the morphology diagram, it can only be obtained if one carefully matches the channel geometry with the substrate wettability. Thus, a water filament in a narrow channel that has a width of 100 nanometer can sustain an overpressure up to 15 atm. In contrast, if the channel had a width of one millimeter, the water filament could only sustain a thousandth part of an atmosphere.

One relatively simple application of the morphology is obtained if the system is designed in such a way that one can vary or switch the contact angle in a controlled fashion. One such method is provided by electrowetting; alternative methods, which have recently been developed, are substrate surfaces covered by molecular monolayers that can be switched by light, temperature, or electric potential.

The experiments described in the PNAS study use a polymeric liquid that freezes quickly and can then be scanned directly with the tip of an atomic force microsope. However, the same morphology diagram should also apply to other liquids and other substrate materials. It should also remain valid if one further shrinks the surface channels and, in this way, moves deeper into
'"/>

Source:Max-Planck-Gesellschaft


Page: 1 2 3 4

Related biology news :

1. Scripps scientists find potential for catastrophic shifts in Pacific ecosystems
2. A new way to share models of biological systems
3. Motor transport in bio-nano systems
4. Nanoscale method for investigating living systems
5. Cookbook recipes would cure disease with nontoxic DNA delivery systems
6. Avian influenza virus in mammals spreads beyond the site of infection to other organ systems
7. Ocean acidification threatens cold-water coral ecosystems
8. Beaver dams create healthy downstream ecosystems
9. Killer B cells demonstrate evolutionary link between fish and mammal immune systems
10. Study warns deep-sea mining may pose serious threat to fragile marine ecosystems
11. Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems
Post Your Comments:
(Date:12/3/2009)Spanish researchers have measured CO2 levels for the past three years in the troposphere (lower atmosphere) over a sparsely inhabited rural area near Valladolid. The results, which are the first of th
(Date:12/2/2009)PHILADELPHIA Less acculturated Latino men have a more difficult time quitting smoking than those who are more acculturated to U.S. culture, but acculturation has no affect on Latinas odds of quitting
(Date:12/2/2009)PHILADELPHIA Exposure to secondhand smoke for a prolonged period of time and in high quantity may increase the risk of breast cancer, even in women who never smoked cigarettes themselves. , "The qu
Breaking Biology News(10 mins):CO2 levels rising in troposphere over rural areas 2Acculturation affects smoking cessation success among Latinos 2Exposure to secondhand cigarette smoke over a lifetime increased breast cancer risk later in life 2Arena Pharmaceuticals to Present at the Piper Jaffray 21st Annual Health Care Conference 14956 1Arena Pharmaceuticals to Present at the Piper Jaffray 21st Annual Health Care Conference 14956 2Health Robotics Continues its Global Expansion With December 09 ASHPs Launch of Joint Venture in Canada 14954 1Health Robotics Continues its Global Expansion With December 09 ASHPs Launch of Joint Venture in Canada 14954 2Zimmer Holdings to Present at 21st Annual Piper Jaffray Health Care Conference 6502 1
...g from a blood disorder that prevents proper clott...ramatically improve their health. There are estima...n the U.S. diagnosed with chronic immune thrombocy...dramatically reduces the number of platelets in th...ly, life-threatening brain hemorrhages. , Promac...
...ay, 22 March aims to raise public awareness of the...r planet. In a densely populated world, droughts a.... , Helmholtz scientists in the research field Ea...ecisely these problems. In cooperation with partne...eams, they are looking at the issue from all angle...
...ave always been fascinated by bats, but the scope ...fly and their bizarre habit of sleeping upside dow...t their daytime perches. , A Brown University-led...g approaches of three species of bats two that li...y found was surprising: Not all bats land the same...
Other Biology News:Lancet study supports new, highly effective treatment for blood disorder 2Lancet study supports new, highly effective treatment for blood disorder 3Research to secure a safe water supply 2Research to secure a safe water supply 3Research to secure a safe water supply 4Brown-led team offers first look at how bats land 2Brown-led team offers first look at how bats land 3
(Date:12/3/2009)SAN FRANCISCO, Dec. 3 VIA Pharmaceuticals, Inc. (Nasdaq: VIAP ), a biotechnology company focused on the development of compounds for the treatment of cardiovascular and metabolic disease, today anno
(Date:12/3/2009)NEW DELHI, India, Dec. 3 /PRNewswire-Asia/ -- Dr. Susan Jiang, M.D., Ph.D.,Chief Science Officer at Shenzhen Beike Biotechnology Co. Ltd.,( http://www.beikebiotech.com ), spoke at a conference on Hig
(Date:12/2/2009)NEW YORK, Dec. 2 Reportlinker.com announces that a new market research report is available in its catalogue: ,, Drug Discovery Technologies - A Global Update of Market Trends & Opportunities ,,
(Date:12/2/2009)LIBREVILLE, Gabon, December 2 , - "Bolstering Biodiversity in Africa: Everyone,s Problem and Heritage" , Coinciding with the International Year of Biodiversity, 2-3 June 2010 the,Gabonese Rep
Breaking Biology Technology:VIA Pharmaceuticals Completes Patient Visits in Phase 2 Trial of VIA-2291 2VIA Pharmaceuticals Completes Patient Visits in Phase 2 Trial of VIA-2291 3VIA Pharmaceuticals Completes Patient Visits in Phase 2 Trial of VIA-2291 4Beike Biotechnology CSO Speaks on Role of Stem Cells in Treating Diabetic Foot Disease at IPA Diabetic Foot Care Conference, India 2Beike Biotechnology CSO Speaks on Role of Stem Cells in Treating Diabetic Foot Disease at IPA Diabetic Foot Care Conference, India 3Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 2Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 3Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 4Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 5Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 6Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 7Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 8Reportlinker Adds Drug Discovery Technologies - A Global Update of Market Trends & Opportunities 9Libreville International Conference 2-3 June 2010 2
...innovation in adaptive and assistive technology, ...PRNewswire/ - Touch,Bionics, developer of the worl... announced that the i-LIMB Hand has won a 2008 da ...ociety., The da Vinci Awards recognize the most i...d assistive technology. The National Multiple,Scle...
...ence Therapeutics plc (AIM: SLN), a,leading Europe...hat the US,Patent and Trademark Office has indicat... 10/633,630, Silence,s core RNAi patent applicatio...er announcement once the,official information has ...http://www.silence-therapeutics.com ), Silence Th...
...y 30 DNA Heritage has recently,overcome patent cl...y,restricted the use of DNA testing and databases ...connect up through their DNA. The patent covers th... family connection. The UK,Intellectual Property O...tating that the relevant claims are all invalid., ...
Other Biology Technology:Touch Bionics a 2008 da Vinci Award winner 2Silence Therapeutics Patent Update 2Silence Therapeutics Patent Update 3DNA Heritage Success in Patent Battle Helps Keep Genealogy DNA Test Prices Low 2
... containing a clone of the human Topoisomerase II ... topological state of nucleic acids by passing an ...enerates a separate DNA helix (1,2) . As a result ...enzyme can relax negatively or positively supercoi...
...I catalyzes the template-directed polymerization o...DNA Polymerase I possesses a 3?5 exonuclease activ...rror rate during DNA replication, and also contain...zyme to replace nucleotides in the growing strand ...
...e Klenow Fragment is a genetically engineered Klen...vity has been removed, leaving only the 5 to 3 pol...ctivity makes Exo- Klenow Fragment the enzyme of c...s by the random primed method, and for DNA sequenc...
T7 RNA Polymerase from Invitrogen
Biology Products: