NKY® Nano PVP K12~120

Properties: Non-toxic, non-irritating, hygroscopic, readily soluble in water, alcohol, amines, and various other organic solvents. It has excellent solubility, film-forming properties, chemical stability, physiological inertness, adhesiveness, and complexation ability.

Product Standards: Electronic Grade.

Specifications: Based on the polymer molecular weight and the viscosity of the aqueous solution, the K value is calculated and divided into the following types.

Note: The K value is derived from the kinematic viscosity of a 1% aqueous solution and is calculated based on the Mark-Houwink equation.

Product Features: The electronic grade K30 product effectively controls the moisture content to less than 2.5%.

Main application fields:

Dispersants in photovoltaic conductive slurry.

Morphological regulators, capping agents, and dispersants in silver powder synthesis.

Morphological regulators, capping agents, and dispersants in copper powder synthesis.

Dispersants and coating agents in the synthesis of silver-coated copper powder.

NKY ® Nano PVP dispersion regulation mechanism

In the synthesis and dispersion process of silver and copper powders, PVP plays multiple roles. Firstly, PVP is an excellent stabilizer that combines with the nanomaterial crystal faces through the C=O and C-N structures in its amide groups. The hydrophobic carbon chains extend into the solvent and interact to generate a repulsive force, forming a steric hindrance effect, which stabilizes nano and sub-micron structures and prevents particle collisions and aggregation. Due to the ultra-fine particle size and large specific surface area of nano and sub-micron materials, it is extremely difficult to disperse them in solvents under the action of van der Waals forces between the particles. PVP can encapsulate nano and sub-micron particles, reduce the van der Waals forces between particles, elongate the distance between particles, and achieve a dispersion effect. PVP is also commonly a morphological control agent. By adsorbing on specific crystal face, it reduces the surface energy of those faces and hinders their growth. For example, when PVP is dispersed in a glycol system, PVP strongly binds to the {100} face of Ag, allowing growth along the {111} direction and obtaining Ag nanowires.

PVP disperses silver powder particles            PVP regulates directional growth

Application Example:

Using NKY® Nano PVP K30 as a dispersant and morphological regulator, ascorbic acid (VC) as a reducing agent, and silver nitrate as the precursor, sub-micrometer spherical silver particles are prepared through a liquid-phase chemical reduction method.