What Are The Physical Properties Of Titanium Particles?

Nov 01, 2025

A. Basic Characteristics

1. Size Effect

When the size of titanium particles decreases to the 10-nanometer level, their physicochemical properties differ significantly from those of bulk materials, mainly due to the "high dispersant effect" caused by the increased proportion of surface atoms. Nanoscale metal particles exhibit quantum confinement effects; even small changes in the number of atoms can significantly alter their electronic structure and optical properties.

2. Morphological Characteristics

Particle shape directly affects processing performance. Spherical particles are more conducive to preparing porous materials with uniform pore size. Non-spherical particles may lead to anisotropic product properties, but this can be quantified using complex shape factors.

B. Optical and Electrical Properties

1. Plasmon Resonance Gold nanoparticles exhibit characteristic surface plasmon resonance peaks in the ultraviolet-visible region, a property widely used in sensing and photocatalysis. Noble metal nanoparticles have extremely low light reflectivity and appear black.

2. Conductivity Reducing the size of nanoparticles leads to increased resistance; for example, the resistivity of 10-25 nm palladium microparticles is higher than that of bulk materials. Gold nanoparticles can enhance electrode conductivity and, after modification, can be used to fabricate highly sensitive biosensors.

C. Thermodynamic Properties

1. Melting Point and Heat Capacity The melting point of nanoparticles decreases significantly due to their increased surface energy; this phenomenon is also observed in precious metals such as silver and gold. The isobaric specific heat capacity of nano-palladium crystals is 5% higher than that of polycrystalline palladium, and it continues to increase with decreasing particle size.

2. Thermal Expansion Behavior Nano-silver exhibits anomalous thermal expansion above 373 K, and its average coefficient of thermal expansion is higher than that of bulk silver.

D. Mechanical Properties

Particle Size Influence: The pressing and sintering behavior of metal powders is strongly dependent on particle size distribution. Industrial porous materials typically use 1-500 μm particles.

Ductility: Macroscopic metals generally exhibit good ductility, but the mechanical behavior of nanoparticles depends more on their surface atomic arrangement.

E. Typical Applications Catalysis: Utilizing the quantum size effect to enhance surface activity in composite materials.

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