science

Nonoxynols

Nonoxynols is a science 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 Nonoxynols rather than just read about it. In short: Nonoxynols, also known as nonylphenol ethoxylates (NPEs), are a group of nonionic surfactants within the alkyl phenol ethoxylate superfamily. Alkyl phenol ethoxylates (APEs, APEO) have the chemical formula RC6H4(OC2H4)nOH (1 < n < 20).

Key takeaways

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

Reference excerpt

Nonoxynols, also known as nonylphenol ethoxylates (NPEs), are a group of nonionic surfactants within the alkyl phenol ethoxylate superfamily. Alkyl phenol ethoxylates (APEs, APEO) have the chemical formula RC6H4(OC2H4)nOH (1 < n < 20). Nonoxynols are the subfamily of APEs with R = iso-C9H19 (iso-nonyl). Like almost all APEs, nonoxynols are colorless (or nearly so) oils. Nonoxynols are used as detergents, emulsifiers, wetting agents or defoaming agents. The most commonly discussed compound nonoxynol-9 is a spermicide, formulated primarily as a component of vaginal foams and creams. Nonoxynol was found to metabolize into free nonylphenol when administered to lab animals.

Production APEs are produced by ethoxylation of alkylphenols. Nonylphenol, the precursor to nonoxynols, is derived via alkylation of phenol with tripropylene, a mixture of branched nonenes. Commercially available nonoxynols are mixtures that vary in the average number of repeating ethoxy (oxy-1,2-ethanediyl) groups, resulting in Nonoxynol-4, Nonoxynol-7, Nonoxynol-9, Nonoxynol-14, Nonoxynol-15, Nonoxynol-18, Nonoxynol-30, Nonoxynol-40, and Nonoxynol-50.

Use Nonoxynols have been used as detergents, emulsifiers and wetting agents in cosmetics, including hair products, and defoaming agents. Only nonoxynol-9 with 9 repeating ethoxy groups, has been used as a spermaticide, for vaginal foams and creams, and on condoms.

Toxicity concerns Concerns about the environmental impact of these compounds has increased since the 1990s. These surfactants have a mild to medium estrogenic function. Consequently, this class of detergents has been effectively restricted for commercial "down-the-drain" applications in Europe, and these compounds are no longer used by U.S. laundry manufacturers. On January 14, 2016, the European Commission amended existing restriction on NPEs under the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) legislation, limiting NPE use in industrial and institutional cleaning, domestic cleaning, cosmetics and other applications including spermicides and in use as co-formulants in pesticides (except for pesticides where prior authorization was granted before July 17, 2003 in which effects of the restriction will not occur until date of their expiration) amounts equal to or exceeding 0.1% by weight, and limiting NPE residues on textile articles to 0.01% by weight, effective February 3, 2021. Previously, the use of NPE was forbidden within the EU, but there was no limit on the level of NPE residue on imported articles. On 13 August 2008, the Swedish newspaper Göteborg Posten (sv) reported finding high levels of the NPE in Björn Borg underwear. A 2011 investigation found residual levels of NPE in samples of clothing from 14 brands sold in the U.S., including Adidas, Uniqlo, Calvin Klein, H&M, Abercrombie & Fitch, Lacoste, Converse and Ralph Lauren.

Notes

References

External links J.K.G. Dondt, G. Gomppner, D. Richter (Eds) Soft matter: complex materials on mesoscopic scales - Schriften des Forschungszentrum Jülich, Vol. 10, 2002.

Worked examples

Example 1 — a first encounter with Nonoxynols

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

In research: Nonoxynols appears in science 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 Nonoxynols 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: Nonoxynols is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkyl-substituted benzenes, Non-ionic surfactants, Phenol ethers, so understanding it makes those chapters shorter.
In everyday life: Look for Nonoxynols 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 Nonoxynols in 20 minutes

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

Frequently asked questions

What is Nonoxynols in simple terms?

Why does Nonoxynols matter?

Because it connects several science 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 Nonoxynols?

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 Nonoxynols.