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Circuit board
Colored scanning electron micrograph (SEM) of a cross section of a
multilayered circuit board which is still under construction. Initially
the conductive material completely covers both surfaces but is then
selectively removed during the process to create the circuit. The
holes in the top serve as connections for other components. A thick
insulating layer (in green) reinforced with fiberglass makes up much
of the board. Printed circuit boards are wafer-thin, flexible and used
in most electronic devices. Magnification: 36 X.
Velcro
Colored Scanning Electron Micrograph (SEM) of nylon hooks and loops
in Velcro material. Used as a common fastener on clothes and shoes,
Velcro is a nylon material formed into two different structures: one a nail-
head-like surface, and the other a smooth surface made up of a series
of loops. The loops are loosely woven strands among an otherwise
tight weave. When the two surfaces are brought together they form a
strong bond, but can still be pulled apart. Magnification: 50 X.
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Moderation Team
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