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chemistry

Photosensitive glass

Photosensitive glass is a chemistry 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 Photosensitive glass rather than just read about it. In short: Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. Photosensitive glass was first discovered by S.

Photosensitive glass — main illustration
Photosensitive glass — illustration

Key takeaways

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

Reference excerpt

Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. Photosensitive glass was first discovered by S. Donald Stookey in 1937.

Exposure process When the glass is exposed to UV light with wavelengths between 280 and 320 nm, a latent image is formed. The glass remains transparent at this stage, but its ability to absorb UV light increases. This increased absorption is only detectable using UV transmission spectroscopy and is caused by an oxidation–reduction reaction that occurs inside the glass during exposure. This reaction causes cerium ions to oxidize to a more stable state, and silver ions are reduced to silver.

Post-exposure heat treatment The latent image captured in the glass is made visible by heating. This heat treatment is done by raising the temperature to about 500 °C to allow the oxidation–reduction reaction to form silver nanoclusters. Following this, the temperature is raised to 550–560 °C, and lithium metasilicate (Li2SiO3) forms on the silver nanoclusters. This material forms in the crystalline phase.

HF chemical etching The lithium metasilicate in the exposed regions of the glass can be etched by hydrofluoric acid (HF). This forms glass microstructures with a roughness in the range of 5 μm, resulting in a three-dimensional image of the mask to be produced. to 0.7 μm.

See also Photochromic lens

References

Bibliography Encyclopædia Britannica, The New Encyclopædia Britannica, v.8 Macropaedia Ge-Hu, Encyclopædia Britannica, 1974, ISBN 0-85229-290-2 Parker, Sybil P., Dictionary of Scientific and Technical Terms. McGraw-Hill Companies, Inc., (2003) - "photosensitive glass," ISBN 0-07-042313-X, Maluf, Nadim et al., Introduction to Microelectromechanical Systems Engineering, Artech House, 2004, ISBN 1-58053-590-9 Paul, Amal, Chemistry of Glasses, Springer, 1990, ISBN 0-412-27820-0 Stookey, S. Donald, Journey to the Center of the Crystal Ball : An Autobiography, American Ceramic Society (1985), ISBN 0-916094-69-3 Stookey, S. Donald, Explorations in Glass: An Autobiography, Wiley-Blackwell (2000), ISBN 1-57498-124-2

External links

Illustrations

Photosensitive glass: Photosensitive glass vase
Photosensitive glass vase

Worked examples

Example 1 — a first encounter with Photosensitive glass

Start with the simplest possible case. Write down what Photosensitive glass claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Photosensitive glass 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 Photosensitive glass 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 Photosensitive glass

In research
Photosensitive glass appears in chemistry 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 Photosensitive glass 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
Photosensitive glass is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1937 in science, 1937 introductions, American inventions, so understanding it makes those chapters shorter.
In everyday life
Look for Photosensitive glass 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 Photosensitive glass in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Photosensitive glass 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 Photosensitive glass out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Photosensitive glass in simple terms?

Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. Photosensitive glass was first discovered by S.

Why does Photosensitive glass matter?

Because it connects several chemistry 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 Photosensitive glass?

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 Photosensitive glass.

Tags

  • 1937 in science
  • 1937 introductions
  • American inventions
  • Ceramic materials
  • Glass chemistry
  • Photography equipment

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