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Nanopin film

Nanopin film is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nanopin film rather than just read about it. In short: Nanopin film is an experimental material in nanotechnology developed in 2005 with unusual superhydrophobic properties [1]. A droplet of water makes contact with the surface of this film and forms an almost perfect sphere with a contact angle of 178°.

Key takeaways

  • Nanopin film belongs to engineering; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Nanopin film to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Nanopin film from memory before moving on to harder problems.

Reference excerpt

Nanopin film is an experimental material in nanotechnology developed in 2005 with unusual superhydrophobic properties [1]. A droplet of water makes contact with the surface of this film and forms an almost perfect sphere with a contact angle of 178°. This happens because it is covered with nanoscale, topped-off pins or cones perpendicular to the surface. The surface is regarded as a composite material with mostly air and a small fraction constituted by the tops of the cones. When the contact angle of the cone material is sufficiently large, Cassie's law predicts large contact angle values for the composite. This particular nanopin film is produced with borosilicate glass. A solution of CoCl2•6H2O or cobalt chloride hexahydrate is heated at 60 °C for 24 hours in a chemical bath deposition to form a brucite type cobalt(II) hydroxide layer with composition

CoOH1.13Cl0.09(CO3)0.39.0.05H20 The top coating is provided by lauric acid in a separate step. A 3 square micrometer surface now contains on average 166 such cones with cone height of around 100 nm, and the cone diameter at the tip is 6.5 nm. The Cassie's law prediction for this material with the lauric acid surface area contact fraction of 0.000612 and flat film contact angle of 75° is 177.8°.

See also

References ^ Superhydrophobic Perpendicular Nanopin Film by the Bottom-Up Process Eiji Hosono, Shinobu Fujihara, Itaru Honma, and Haoshen Zhou J. Am. Chem. Soc.; 2005; 127(39) pp 13458 – 13459 Abstract Supporting info with pics

Worked examples

Example 1 — a first encounter with Nanopin film

Start with the simplest possible case. Write down what Nanopin film claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nanopin film before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nanopin film ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nanopin film

In research
Nanopin film appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Nanopin film in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Nanopin film is common in secondary-school and first-year university syllabi. It links to neighbouring topics Nanomaterials, so understanding it makes those chapters shorter.
In everyday life
Look for Nanopin film outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Nanopin film in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Nanopin film means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Nanopin film out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nanopin film in simple terms?

Nanopin film is an experimental material in nanotechnology developed in 2005 with unusual superhydrophobic properties [1]. A droplet of water makes contact with the surface of this film and forms an almost perfect sphere with a contact angle of 178°.

Why does Nanopin film matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nanopin film?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nanopin film.

Tags

  • Nanomaterials

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