What is hydrogel and what is it used for?

The colloidal particles or polymers in the sol or solution are connected to each other under certain conditions to form a spatial network structure, and the structural voids are filled with the liquid as a dispersion medium (in the dry gel can also be a gas, the dry gel is also called aerogel), such a special dispersion system is called a gel.

It has no fluidity and often contains a large amount of liquid inside. For example, the water content of blood gel and agar can reach more than 99%. It can be divided into elastic gel and brittle gel.

The volume of the elastomeric gel shrinks significantly when it loses its dispersion medium, and when it is reabsorbed into the dispersion medium, it expands again, e.g. gelatin.

When the brittle gel loses or reabsorbs the dispersion medium, the shape and volume do not change, such as silica gel. The process of forming a gel from a solution or sol is known as gelling.

Hydrogels are a class of extremely hydrophilic three-dimensional network structure gels, which swell rapidly in water and can maintain a large volume of water without dissolving in this swelling state.

Due to the presence of a cross-linking network, hydrogels can swell and retain a large amount of water, and the amount of water absorbed is closely related to the degree of cross-linking. The higher the degree of crosslinking, the lower the water absorption. This property is much like a soft tissue.

The water content in hydrogels can be as low as a few percent or as high as 99 percent. The aggregate state of the gel is neither a complete solid nor a complete liquid. The behavior of solids is that they can maintain a certain shape and volume under certain conditions, and the behavior of liquids is that solutes can diffuse or penetrate from the hydrogel.

The aerospace industry is inseparable from aerogel, what is aerogel? Today is a long time to see.

Gel-free paint, gel is a semi-solid state of thick substance, no fluidity, often contains a large amount of liquid inside, will be used in many industries, such as gel pillows, gel mattresses, aloe vera gel, etc. Common skin care gels in life, such as acne gel, bath gel, aloe vera gel, essence lotion, etc., this kind of texture can be called gel.

Gels generally have the following effects:

1. Hydration. The gel is rich in natural physiological water, minerals and lignin, and is extremely permeable, like a sponge absorbing water to the deepest layer, directly replenishing the required water.

2. Whitening and moisturizing. The whitening gel is rich in a variety of amino acids and natural whitening and moisturizing factors, which can be directly absorbed, decomposed and converted into pigment deposition to achieve natural moisturizing and whitening.

3. Anti-aging. Gels rich in monosaccharides, polysaccharides, vitamins and minerals have a delaying effect on cell aging and reduce the appearance of wrinkles.

4. Hand and foot care. The skin care gel has good absorption performance, the natural gel has good air permeability to achieve moisturizing and water locking, so that the skin can maintain long-lasting skin-friendliness, and the gel can also be released slowly and continuously absorbed to maintain a long-term beauty and skin care effect.

Gelling agent, or rheology promoter, is a natural or synthetic polymer, or inorganic filler, which can change the rheology of coatings, such as changing from Newtonian fluids to pseudoplastic fluids, so that coatings can reduce sagging when applied.

Hydrogel-coated matrices combine the excellent properties of the matrix (e.g., strength, stiffness, and toughness) with the excellent properties of the hydrogel (e.g., hydrophilicity, lubricity, biocompatibility, and drug release). In principle, any hydrogel can be coated with any matrix by its binding to achieve certain functions. This immense diversity enables many existing and emerging applications in the fields of engineering and medicine.

Examples include drug delivery, soft robotics, implants, artificial**, sensors and actuators, ion electronics, and marine antifoulants.

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Summary. Dear, I am glad to answer for you: the difference between hydrogel + dry gel, wet gel, aerogel and other terms.

Answer: Dry gel and aerogel are one substance. There is no difference between the two.

Dry gel is also known as aerogel. When the gel removes most of the solvent, so that the liquid content in the gel is much less than the solid content, or the medium filled with gas in the spatial network structure of the gel is solid, this is called dry gel, also known as aerogel. Such as gelatin, gum arabic, silicone, hair, nails, etc.

Aerogel also has the properties of gel, that is, it has swelling, thixotropy, and slurrying.

Distinguish terms such as hydrogel + dry gel, wet gel, aerogel, etc.

Dear, I am glad to answer for you: the difference between hydrogel + dry gel, wet gel, aerogel and other terms Answer: Dry gel and aerogel are one substance.

There is no difference between the two. Dry gel is also known as gas condensation ruler first gel. When the gel is removed from the large number of partial dissolving agents, so that the liquid content in the gel is much less than the solid content, or the medium filled with gas in the spatial network structure of the gel is solid, which is a dry gel, also known as aerogel.

Such as gelatin, gum arabic, silicone, hair, nails, etc. Aerogel also has the properties of gel, that is, it has swelling, thixotropy, and slurrying.

Aerogel is a kind of porous, similar to the cavernous sponge molded silicon element solid, and there is space in the porous form This kind of new material has a density of only 3kg m3, which seems fragile, but it is actually very strong and durable, and can withstand high temperatures of up to 1400 Because it is wear-resistant and elastic, it is reported that when NASA sent astronauts to land on Mars in 2018, it was used as heat insulation to make spacesuits! Hydrogel is a gel with water as the dispersion medium. A cross-linked polymer with a water-soluble polymer with a reticulated nano-translinking structure introduces a hydrophobic group and a hydrophilic residue, and the hydrophilic residue binds to the hydrophilic molecule to connect the water molecules inside the network, while the hydrophobic residue expands when exposed to water.

It is a particularly hydrophilic three-dimensional network gel, and it can also swell in water, and it can make a large amount of volume water insoluble when it expands. It can be used in industry, agriculture and medical.

Hydrogel is a kind of extremely hydrophilic three-dimensional network structure gel, which has strong water absorption and water retention ability, and is widely used in physiological and hygiene products.