Silane quats

Key takeaways

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

Reference excerpt

Silane-Quats are a class of antimicrobials developed by Dow Corning and first patented in the United States of America in February 1971 (U.S. Patent Number 3560385). Subsequent patents were filed in the 1970s by Dow Corning for utilizing its silane-quat as an effective antimicrobial. In doing so, Dow Corning had invented a durable, non-leaching, persistent, surface bonding antimicrobial effective against a wide range of unicellular microorganisms on a variety of surfaces. There are at least four private companies in the United States that are the primary manufacturers of Silane-Quats, which are widely known by various names such as Quat-Silane, SiQuats, Si-Qacs, Organosilane and Sil-Quats. Synthesis is typically conducted in a methanol, however, there are water-synthesized formulations which range in stability depending on the dilution process and/or the presence of stabilizers and additives.

Chemical composition Current manufacturing methods produce concentrated Silane-Quats that range from 42% to 72% active ingredient by weight, with the remainder of the formulation being silanes, alkylamines and methanol. Its chemical formula is C26H58NO3SiCl. In manufactured concentrated state, Silane-Quat is referred to as: 3-(trimethoxysilyl) propyldimethyloctadecyl ammonium chloride In a diluted or hydrolyzed state in formulation it is referred to as: 3-(trihydroxysilyl) propyldimethyloctadecyl ammonium chloride The composition of Silane-Quat is a long chain molecule with three basic parts: a silane base for covalent bonding to surfaces, a centrally located positively charged nitrogen component and a long chain "spear" consisting of a methyl hydrocarbon group. This spear group performs the efficacy work of the molecule.

Uses

Manufacturing Several finished goods utilize manufacturing processes that deploy Silane-Quats into the composition of raw material. Things such as plastics, rubber and textiles are many times impregnated with Silane-Quat in order to give them antimicrobial properties. These antimicrobial properties help the finished goods in many ways. Primarily they aid in inhibiting the growth and colonization of microbes on the product. This in turn prevents material degradation, odors caused by bacterial growth and a decrease in the occurrences of infection caused by microbial contamination. When 'built into' the raw materials of a finished product, Silane-Quats are very effective and durable. Examples of this type of application are antimicrobial plastics used in things like medical equipment or personal item bins at airports. Many smaller items are manufactured using antimicrobial raw materials like paints, mousepads, bath towels, footwear and athletic clothing. In recent years, new product applications for silane-quat have also been developed. One example being antimicrobial adhesive tapes that cover touch points like door knobs, handrails or elevator buttons. These types of products make it quick and easy to protect high touch areas with a self sanitizing media. In recent years there have been several clinical research studies involving medical implants and other surgical items that have been manufactured using Silane-Quats in order to reduce the occurrence of post operative infection.

Preventative antimicrobial Silane-Quats are widely applied to homes and public areas such as offices, hospitals and schools as a preventative antimicrobial. Utilizing foggers, electrostatic sprayers and trigger sprayers, Silane-Quats are applied to clean, dried and pre-sanitized surfaces and allowed to dry. Typically these solutions are anywhere from .50%-2.0% mixtures of water and Silane-Quat. Once sprayed and dried, the application renders a surface antimicrobial. There is debate on the longevity of these applications. It is widely noted that they are not permanent and must be re-applied periodically. The general scientific consensus is that a properly treated surface should remain antimicrobial for anywhere from 6–8 weeks with moderate touch/abrasion activity. Surfaces that do not see intense touch or abrasion traffic will typically retain their antimicrobial properties longer. The common industry consensus is that for low traffic areas re-application should be done approximately every 90 days.

Odor control agent Odor control is a major problem that is efficiently addressed by Silane-Quats. This is accomplished by preventing the growth colonization of odor causing bacteria on a surface.

Disinfecting formulation component There are disinfection products on the market that use Silane-Quats as a component of their formulations. When mixed with a compatible primary disinfecting agent to render an immediate wet kill, the formulation is left to dry on the surface and once dried, the Silane-Quat bonds to the surface and continues to work by providing a 'dry kill' for an extended period of time after initial use. These formulations are extremely effective, however they must be allowed to air dry completely after application so that the Silane-Quat can bond to the surface in order to continuously provide efficacy when dried. These disinfecting formulations differ from standard Quat-Silane formulations in that they provide a dual action of disinfection and antimicrobial protection in one single product.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Silane quats

Start with the simplest possible case. Write down what Silane quats 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 Silane quats 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 Silane quats 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 Silane quats

In research: Silane quats 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 Silane quats 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: Silane quats is common in secondary-school and first-year university syllabi. It links to neighbouring topics Quaternary ammonium compounds, Silanes, so understanding it makes those chapters shorter.
In everyday life: Look for Silane quats 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.

How to study Silane quats in 20 minutes

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

Frequently asked questions

What is Silane quats in simple terms?

Silane-Quats are a class of antimicrobials developed by Dow Corning and first patented in the United States of America in February 1971 (U.S. Patent Number 3560385).

Why does Silane quats 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 Silane quats?

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 Silane quats.