Tham khảo tài liệu 'the mems handbook introduction & fundamentals (2nd ed) - m. gad el hak part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Physics of Thin Liquid Films 12-5 FIGURE Deposition of water onto a patterned surface with hydrophilic microchannels with corners. The width of the channel in the corner region increases from channel a to channel e . Time and therefore the volume of the condensate increase from top to bottom. When a microchannel undergoes a morphological change of its shape the drop moves to the corner to maximize the contact area with the hydrophilic part of the substrate. Reprinted with permission from Herminghaus et al. 2000 . the alignment process presented here takes place in the time range of a second. A similar mechanism by which a hard contact lens centers itself over the cornea in a human eye was discussed by Moriarty and Terrill 1996 . The centrifugal spinning of volatile solutions is a convenient and efficient means of coating planar solids with thin films. This process known as spin coating has been widely used in many technological processes such as deposition of dielectric layers onto silicon wafers in the microelectronic industry formation of ultrathin antireflective coatings for deep UV lithography and others. Two important stages of 2006 by Taylor Francis Group LLC 12-6 MEMS Introduction and Fundamentals FIGURE Infrared images of various states as seen in the experiments. The temperature increases with increasing brightness so warm depression regions are white except in c and cool elevated regions are dark. Each image has its own brightness so temperatures in different images cannot be compared. a A localized depression dry spot with a helium gas layer and d cm. b A localized elevation high spot with an air gas layer and d cm. c A dry spot with hexagons in the surrounding region and d cm. d Hexagons with an air gas layer and d cm. For more detail refer to the source. Reprinted with permission from VanHook et al. 1997 . t 0 00 min 10 30 min 13 50 min t 15 30 min 17 10 min 20 15 min FIGURE The evolution of a localized depression
