physics

Nanocomposite hydrogels

Nanocomposite hydrogels is a physics 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 Nanocomposite hydrogels rather than just read about it. In short: Nanocomposite hydrogels (NC gels) are nanomaterial-filled, hydrated, polymeric networks that exhibit higher elasticity and strength relative to traditionally made hydrogels. A range of natural and synthetic polymers are used to design nanocomposite network.

Key takeaways

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

Reference excerpt

Nanocomposite hydrogels (NC gels) are nanomaterial-filled, hydrated, polymeric networks that exhibit higher elasticity and strength relative to traditionally made hydrogels. A range of natural and synthetic polymers are used to design nanocomposite network. By controlling the interactions between nanoparticles and polymer chains, a range of physical, chemical, and biological properties can be engineered. The combination of organic (polymer) and inorganic (clay) structure gives these hydrogels improved physical, chemical, electrical, biological, and swelling/de-swelling properties that cannot be achieved by either material alone. Inspired by flexible biological tissues, researchers incorporate carbon-based, polymeric, ceramic and/or metallic nanomaterials to give these hydrogels superior characteristics like optical properties and stimulus-sensitivity which can potentially be very helpful to medical (especially drug delivery and stem cell engineering) and mechanical fields. Nanocomposite hydrogels are not to be confused with nanogel, a nanoparticle composed of a hydrogel.

Synthesis The synthesis of nanocomposite hydrogels is a process that requires specific material and method. These polymers need to be made up of equally spaced out, 30 nm in diameter, clay platelets that can swell and exfoliate in the presence of water. The platelets act as cross-links to modify molecular functions to enable the hydrogels to have superior elasticity and toughness that resembles closely that of biological tissue. Using clay platelets that do not swell or exfoliate in water, using an organic cross-linker such as N,N-methylenebisacrylamide(BIS), mixing of clay and BIS, or preparing nanocomposite hydrogels in a method other than cross-link, will be unsuccessful. Despite all the specifications, the process of synthesizing nanocomposite hydrogels is simple and because of the flexible nature of the material, these hydrogels can be easily made to come in different shapes such as huge blocks, sheets, thin films, rods, hollow tubes, spheres, bellows and uneven sheets.

Properties

Mechanical Nanocomposite hydrogels are tough, and can withstand stretching, bending, knotting, crushing, and other modifications.

Tensile Tensile testings were performed on nanocomposite hydrogels to measure the stress and strain it experiences when elongated under room temperature. The results show that this material can be stretched up to 1000% of its original length.

Compression Hysteresis is used to measure the compression properties of nanocomposite hydrogels, which shows that this material can withstand around 90% compression. This data shows that nanocomposite hydrogels exhibit superior strength relative to conventionally-made hydrogels, which would have broken down under less compression.

Swelling and stimulus sensitivity

Swelling, de-swelling The porous network of clay particles enable nanocomposite hydrogels to swell in the presence of water. Swelling (and de-swelling) distinguishes NC gels from conventionally-made hydrogels (OR gels) as it is a property that OR gels lack. The swelling property of NC gels allows them to collect the surrounding aqueous solution instead of being dissolved by it, which helps make them good candidates for drug delivery carriers.

Stimulus sensitivity Nanocomposite hydrogels are observed to be temperature sensitive and will change temperature when their surrounding is altered. Inorganic salts, when absorbed, will result in changing the hydrogels to a lower temperature whereas cat-ionic surfactant will shift the temperature the other way. The temperature of these hydrogels are around 40 degrees Celsius, making it a possible candidate for use as biomaterial. The stimulus-sensitivity of hydrogels allow for a responsive release system where the hydrogels can be designed to deliver the drug in response to changes in condition of the body.

Types

Via carbon-based nanomaterials Nanocomposite hydrogels that are reinforced with carbon-based nanomaterials are mechanically tough and electrically conductive, which make them suitable for use in biomedicine, tissue engineering, drug delivery, biosensing, etc. The electrical conductivity property of these hydrogels allows them to mimic the characteristics of nerve, muscle, and cardiac tissues. However, even though these nanocomposite hydrogels demonstrate some functions of human tissue in lab environments, more research is needed to ensure their utility as a tissue replacement.

Via polymeric nanoparticles Nanocomposite hydrogels incorporated with polymeric nanoparticles are tailored for drug delivery and tissue engineering. The addition of polymeric nanoparticles gives these hydrogels a reinforced polymeric network that is more stiff and has the ability to enclose hydrophilic and hydrophobic drugs along with genes and proteins. The high stress-absorbing property makes them a potential candidate for cartilage tissue engineering.

Via inorganic nanoparticles Most inorganic nanoparticles used for nanocomposite hydrogels are already present in and necessary for the body, and thus present no negative impacts on the body. Some of them, like calcium and silicon, help with preventing bone loss and skeletal development. Others, like nanoclays, improve the structural formation and characteristics of hydrogels where they acquire self-healing properties, flame retardant structures, elasticity, super gas-barrier membrane, oil-repellence, etc. The unique properties obtained by incorporating nanocomposite hydrogels with inorganic nanoparticles will let researchers work on improving bone-related tissue engineering.

Via metal and metal-oxide nanoparticles The electrical and thermal conductivity and magnetic property of metals enhance the electrical conductivity and antibacterial property of nanocomposite hydrogels when incorporated. The electrical conducting property is necessary for the hydrogels to start forming functional tissues and be used as imaging agents, drug delivery systems, conductive scaffolds, switchable electronics, actuators, and sensors.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Nanocomposite hydrogels

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

In research: Nanocomposite hydrogels appears in physics 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 Nanocomposite hydrogels 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: Nanocomposite hydrogels is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gels, Nanoparticles, so understanding it makes those chapters shorter.
In everyday life: Look for Nanocomposite hydrogels 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 Nanocomposite hydrogels in 20 minutes

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

Frequently asked questions

What is Nanocomposite hydrogels in simple terms?

Why does Nanocomposite hydrogels matter?

Because it connects several physics 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 Nanocomposite hydrogels?

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 Nanocomposite hydrogels.