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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Updated: Feb 11, 2026

Biomimetic Replication of Root Surface Microstructure using Alteration of Soft Lithography
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Biomimetic Replication of Root Surface Microstructure using Alteration of Soft Lithography

Published on: August 5, 2020

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Soft Lithography.

Younan Xia1, George M Whitesides1

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138 (USA), Fax: (+1) 617-495-9857.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary
This summary is machine-generated.

Soft lithography uses elastomeric stamps and molds for microfabrication, offering a simple, inexpensive alternative to photolithography. This technique avoids complex labs and high-energy radiation, making it accessible for various applications.

Keywords:
ElastomersMaterials sciencePatterningSupramolecular chemistry

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Photolithography is the leading method for microfabrication but has disadvantages.
  • These include the need for complex laboratory facilities and high-energy radiation.

Purpose of the Study:

  • To present the current state of development in soft lithography.
  • To highlight soft lithography as a promising alternative for microfabrication.

Main Methods:

  • Utilizing elastomeric stamps and molds.
  • Employing principles of soft lithography.

Main Results:

  • Soft lithography eliminates disadvantages associated with photolithography.
  • The process is simple, inexpensive, and does not require complex facilities or high-energy radiation.

Conclusions:

  • Soft lithography presents a viable and accessible alternative for microfabrication.
  • This technique is suitable for molecular chemists and broad research applications.