05.05.2010
РОССИЙСКАЯ АКАДЕМИЯ НАУК

УРАЛЬСКОЕ ОТДЕЛЕНИЕ

ИНСТИТУТ ХИМИИ TBEPДОГО ТЕЛА
   
| | | | |
| | | | | |
 05.05.2010   Карта сайта     Language По-русски По-английски
Новые материалы
Экология
Электротехника и обработка материалов
Медицина
Статистика публикаций


05.05.2010

Bionic coating could help ships to economize on fuel


Materials based on water ferns could reduce fuel consumption massively



This release is available in German.



The hairs on the surface of water ferns could allow ships to have a 10 per cent decrease in fuel consumption. The plant has the rare ability to put on a gauzy skirt of air under water. Researchers at the University of Bonn, Rostock and Karlsruhe now show in the journal Advanced Materials (doi: 10.1002/adma.200904411) how the fern does this. Their results can possibly be used for the construction of new kinds of hulls with reduced friction.


The water fern salvinia molesta is exremely hydrophobic. If it is submerged and subsequently pulled out the liquid immediately drips off it. After that it is completely dry again. Or to be more precise: it was never really wet. For the fern surrounds itself by a flimsy skirt of air. This layer prevents the plant from coming into contact with liquid. And that even with a dive lasting weeks.


Materials researchers call this behaviour 'superhydrophobic'. This property is of interest for many applications such as rapidly drying swimsuits or simply for fuel-efficient ships. Meanwhile, it is possible to construct superhydrophobic surfaces modelled on nature. However, these 'replicas' have a disadvantage: the layer that forms on them is too unstable. In moving water it disappears after several hours at the latest.


The researchers from Bonn, Rostock und Karlsruhe have now deciphered the trick the water fern uses to pin down its airy skirt. It has been known for some years now that on the surface of its leaves there are tiny whisk-like hairs. These are hydrophobic. They keep water in the surroundings at a distance.



Water is 'stapled in place'



But this is only one side of the coin: 'We were able to show that the outermost tips of these whisks are hydrophilic, i.e. they love water,' Professor Wilhelm Barthlott from the University of Bonn explains. 'They plunge into the surrounding liquid and basically staple the water to the plant at regular intervals. The air layer situated beneath it can therefore not escape so easily.'


Professor Barthlott is head of the Nees Institute of Biodiversity of Plants in Bonn. There the experiments began which are continued today in conjunction with the Chair of Fluid Dynamics at the University of Rostock and the Institute of Applied Physics at the University of Karlsruhe. 'After the solving of the self-cleansing of the lotus leaf twenty years ago, the discovery of the salvinia effect is one of the most important new discoveries in bionics,' Professor Thomas Schimmel from the University of Karlsruhe says.



Fuel saved world wide: one per cent



And it is one with huge technical potential to boot. Up to now with container ships more than half of the propulsion energy is lost through friction of the water at the hull. With an air layer this loss could be reduced by ten per cent according to the researchers' estimate. Since ships are huge fuel guzzlers, the total effect would be enormous. 'Probably one per cent of the fuel consumption worldwide could be saved this way, is Professor Barthlott's prognosis. 'Surfaces modelled on the water fern could revolutionise shipbuilding,' Professor Dr. Alfred Leder from the University of Rostock concurs.


Lotus and the water fern salvinia are only two of maybe twenty million species populating our planet. They all have their secrets, and Bonn, Rostock and Karlsruhe are working on unlocking these.



###


Contact:
Professor Wilhelm Barthlott
Nees Institute of Biodiversity of Plants, University of Bonn
Telephone: +49 (0)228 73 1919
Email: lotus@uni-bonn.de


Professor Dr. Thomas Schimmel
Institut für Angewandte Physik, KIT Karlsruhe
Telephone: +49 721/608-3570
E-Mail: thomas.schimmel@physik.uni-karlsruhe.de


Professor Dr. Alfred Leder
Lehrstuhl für Strömungsmechanik, Universität Rostock
Telephone: +49 381/498-9316
E-Mail: alfred.leder@uni-rostock.de


Дизайн и программирование N-Studio 
А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev   honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

  • © 2004-2024 ИХТТ УрО РАН
    беременность, мода, красота, здоровье, диеты, женский журнал, здоровье детей, здоровье ребенка, красота и здоровье, жизнь и здоровье, секреты красоты, воспитание ребенка рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок медицина, клиники и больницы, болезни, врач, лечение, доктор, наркология, спид, вич, алкоголизм православные знакомства, православный сайт творчeства, православные рассказы, плохие мысли, православные психологи рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок