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Which of the following is an example of bottom-up approach for the preparation of nanomaterials?

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in Engineering Chemistry I by (506k points)
Which of the following is an example of bottom-up approach for the preparation of nanomaterials?

(a) Etching

(b) Dip pen nano-lithography

(c) Lithography

(d) Erosion

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This intriguing question comes from Nanotechnology topic in chapter Materials and their Properties of Engineering Chemistry I

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The correct choice is (b) Dip pen nano-lithography

To explain: Dip pen nanolithography is an example of bottom-down approach for the preparation of nanomaterials. All the other options are the example of top-down approach.

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