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Nanoparticles and Nanomaterials

wallpapers News 2021-01-25
Filling inorganic nanoparticles into polymers as a new type of filler, developing functional composite materials with high toughness, high strength, and excellent processing performance, and opening up a new way for polymer modification. Application prospects.

Surface modification of nanoparticles
Surface modification is the use of physical and chemical methods to treat the surface of nanoparticles, purposefully change the physical and chemical properties of the particle surface, and reduce the surface binding energy of nanoparticles. Enhancing the compatibility of the particles with the polymer matrix so that the nanoparticles are uniformly dispersed in the polymer matrix. Surface physical modification refers to the surface modification of inorganic nanoparticles and their modifiers, except for van der Waals forces, hydrogen bond, or coordination bond interaction, without ionic bond or covalent bond interaction. Surface chemical modification is a chemical reaction between surface modifiers and some groups on the particle surface to achieve the purpose of modification. 
What kind of materials are nanomaterials?
Nanomaterials refer to materials with at least one dimension in the nanometer scale (1-100nm) in three-dimensional space. It is a new generation of materials composed of nanoparticles with sizes between atoms, molecules, and macroscopic systems. The size of nanomaterials is close to the coherence length of electrons, and their properties have changed greatly because of the self-organization brought about by strong coherence. And its scale is close to the wavelength of light, plus the special effect of its large surface, so its characteristics such as melting point, magnetism, optics, thermal conductivity, electrical conductivity, etc., are often different from those of the substance in its overall state nature. Nanomaterials have a certain uniqueness. When the size of the matter is small to a certain extent, it is necessary to use quantum mechanics instead of traditional mechanics to describe its behavior. Because each particle has fewer atoms and the surface atoms are in an unstable state, the amplitude of the surface lattice vibration is larger, so it has higher surface energy, resulting in the unique thermal properties of ultrafine particles, that is, the melting point is lowered. At the same time, nanopowder will be easier to sinter at a lower temperature than traditional powder and become a good sintering promotion material.

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