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ARTICLES IN THE BOOK

  1. Atomic force microscope
  2. Atomic nanoscope
  3. Atom probe
  4. Ballistic conduction
  5. Bingel reaction
  6. Biomimetic
  7. Bio-nano generator
  8. Bionanotechnology
  9. Break junction
  10. Brownian motor
  11. Bulk micromachining
  12. Cantilever
  13. Carbon nanotube
  14. Carbyne
  15. CeNTech
  16. Chemical Compound Microarray
  17. Cluster
  18. Colloid
  19. Comb drive
  20. Computronium
  21. Coulomb blockade
  22. Diamondoids
  23. Dielectrophoresis
  24. Dip Pen Nanolithography
  25. DNA machine
  26. Ecophagy
  27. Electrochemical scanning tunneling microscope
  28. Electron beam lithography
  29. Electrospinning
  30. Engines of Creation
  31. Exponential assembly
  32. Femtotechnology
  33. Fermi point
  34. Fluctuation dissipation theorem
  35. Fluorescence interference contrast microscopy
  36. Fullerene
  37. Fungimol
  38. Gas cluster ion beam
  39. Grey goo
  40. Hacking Matter
  41. History of nanotechnology
  42. Hydrogen microsensor
  43. Inorganic nanotube
  44. Ion-beam sculpting
  45. Kelvin probe force microscope
  46. Lab-on-a-chip
  47. Langmuir-Blodgett film
  48. LifeChips
  49. List of nanoengineering topics
  50. List of nanotechnology applications
  51. List of nanotechnology topics
  52. Lotus effect
  53. Magnetic force microscope
  54. Magnetic resonance force microscopy
  55. Mechanochemistry
  56. Mechanosynthesis
  57. MEMS thermal actuator
  58. Mesotechnology
  59. Micro Contact Printing
  60. Microelectromechanical systems
  61. Microfluidics
  62. Micromachinery
  63. Molecular assembler
  64. Molecular engineering
  65. Molecular logic gate
  66. Molecular manufacturing
  67. Molecular motors
  68. Molecular recognition
  69. Molecule
  70. Nano-abacus
  71. Nanoart
  72. Nanobiotechnology
  73. Nanocar
  74. Nanochemistry
  75. Nanocomputer
  76. Nanocrystal
  77. Nanocrystalline silicon
  78. Nanocrystal solar cell
  79. Nanoelectrochemistry
  80. Nanoelectrode
  81. Nanoelectromechanical systems
  82. Nanoelectronics
  83. Nano-emissive display
  84. Nanoengineering
  85. Nanoethics
  86. Nanofactory
  87. Nanoimprint lithography
  88. Nanoionics
  89. Nanolithography
  90. Nanomanufacturing
  91. Nanomaterial based catalyst
  92. Nanomedicine
  93. Nanomorph
  94. Nanomotor
  95. Nano-optics
  96. Nanoparticle
  97. Nanoparticle tracking analysis
  98. Nanophotonics
  99. Nanopore
  100. Nanoprobe
  101. Nanoring
  102. Nanorobot
  103. Nanorod
  104. Nanoscale
  105. Nano-Science Center
  106. Nanosensor
  107. Nanoshell
  108. Nanosight
  109. Nanosocialism
  110. Nanostructure
  111. Nanotechnology
  112. Nanotechnology education
  113. Nanotechnology in fiction
  114. Nanotoxicity
  115. Nanotube
  116. Nanovid microscopy
  117. Nanowire
  118. National Nanotechnology Initiative
  119. Neowater
  120. Niemeyer-Dolan technique
  121. Ormosil
  122. Photolithography
  123. Picotechnology
  124. Programmable matter
  125. Quantum dot
  126. Quantum heterostructure
  127. Quantum point contact
  128. Quantum solvent
  129. Quantum well
  130. Quantum wire
  131. Richard Feynman
  132. Royal Society's nanotech report
  133. Scanning gate microscopy
  134. Scanning probe lithography
  135. Scanning probe microscopy
  136. Scanning tunneling microscope
  137. Scanning voltage microscopy
  138. Self-assembled monolayer
  139. Self-assembly
  140. Self reconfigurable
  141. Self-Reconfiguring Modular Robotics
  142. Self-replication
  143. Smart dust
  144. Smart material
  145. Soft lithography
  146. Spent nuclear fuel
  147. Spin polarized scanning tunneling microscopy
  148. Stone Wales defect
  149. Supramolecular assembly
  150. Supramolecular chemistry
  151. Supramolecular electronics
  152. Surface micromachining
  153. Surface plasmon resonance
  154. Synthetic molecular motors
  155. Synthetic setae
  156. Tapping AFM
  157. There's Plenty of Room at the Bottom
  158. Transfersome
  159. Utility fog

 



NANOTECHNOLOGY
This article is from:
http://en.wikipedia.org/wiki/Lotus_effect

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Lotus effect

From Wikipedia, the free encyclopedia

 
Water on the surface of a lotus leaf
Water on the surface of a lotus leaf
Computer graphic of lotus leaf surface
Computer graphic of lotus leaf surface

The Lotus effect in material science is the observed self-cleaning property found with lotus plants. In some Eastern systems, the lotus plant is a symbol of cleanliness. Although lotuses prefer to grow in muddy rivers and lakes, the leaves remain clean.

Botanists who have studied lotus leaves have found that they have a natural cleaning mechanism.

Their microscopic structure and surface chemistry mean that the leaves never get wet. Rather, water droplets roll off a leaf's surface like mercury, taking mud, tiny insects, and contaminants with them. This is known as the Lotus Effect.

Some nanotechnologists are developing methods to make paints, roof tiles, fabrics and other surfaces that can stay dry and clean themselves in the same way as the lotus leaf. This can usually be achieved by treatment of the surface with a fluorochemical or silicone treatment. It is also possible to achieve such effects by using combinations of polyethylene glycol with glucose and sucrose. A new paint has now been developed which is self cleaning in this way, and even glass panels have been brought onto the market for use on the roofs of conservatories etc.

In one method [1] an aluminium surface is made superhydrophobic by immersing it in sodium hydroxide for several hours followed by spin coating a layer of perfluorononane to a thickness of 2 nanometers. This procedure increases the water contact angle from 67 to 168, an effect that can be explained by Cassie's law. Electron microscopy shows that the aluminium surface resembles that of a lotus surface with a porous micro structure containing trapped air.

External links

  1. Animation of the lotus effect: LotuseffectAnimation.ogg
  2. International Space University: http://lotus-shower.isunet.edu/the_lotus_effect.htm
  3. University of Bonn: http://www.botanik.uni-bonn.de/system/lotus/en/lotus_effect_html.html

References

  • Barthlott, W. & C. Neinhuis, 1997: The purity of sacred lotus or escape from contamination in biological surfaces, Planta 202: 1-8.
  •   Stable Biomimetic Super-Hydrophobic Engineering Materials Zhiguang Guo, Feng Zhou, Jingcheng Hao, and Weimin Liu J. Am. Chem. Soc.; 2005; 127(45) pp 15670 - 15671; (Communication) DOI: 10.1021/ja0547836 Abstract Electron microscopy
  • Is the lotus leaf superhydrophobic?; Cheng, Y T, Rodak, D E; Appl. Phys. Lett.; 2005; 86 (14) pp 144101
  • Water condensation on a super-hydrophobic spike surface Narhe, R. D., Beysens, D. A. Europhys. Lett.; 2006; 75 (1) pp 98-104
  • Mimicking nature: Physical basis and artificial synthes of the Lotus effect [2]
  • Forbes, Peter (4th Estate, London 2005) 'The Gecko's Foot - Bio Inspiration: Engineered from Nature' ISBN 0-00-717990-1 in H/B
Retrieved from "http://en.wikipedia.org/wiki/Lotus_effect"