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The major limitations on TEM performance are spherical aberration (also known as aberration), chromatic aberration, and astigmatism. The spherical aberration and chromatic aberration limit the resolution of traditional TEM. Both of these defects are inevitable when using static rotational symmetric electromagnetic fields. Ball aberration is the most important factor determining the performance of ...
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Metal Injection Molding (MIM) is an advanced manufacturing process that combines plastic injection molding and powder metallurgy technology, capable of efficiently producing complex shaped, high-precision, and high-performance metal parts. First. The basic process of MIM technology The MIM process mainly consists of the following four core steps: 1. Feed preparation Raw material mixing: Mix ...
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In the fields of material processing and chemical production, coupling agents, crosslinking agents, and dispersants are three commonly used additives with different functions, but they all have a critical impact on material properties. The following provides a detailed explanation from the aspects of definition, main characteristics, typical types, and core differences. Coupling agent Coupling age...
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The factors that affect the forming process mainly include the properties of the powder, the characteristics and effectiveness of additives, and the pressure, pressurization method, and pressurization speed during the pressing process. The properties of the powder mainly include the particle size, particle size distribution, particle shape, and moisture content of the powder. First. The influ...
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With the rapid development of modern industry and technology, different industries have increasingly high performance requirements for powder materials. In addition to having extremely low impurity content, fine particle size, and narrow particle size distribution, powder materials also need to have a certain particle morphology. Spherical powders have been widely used in high-end industries such ...
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In transmission electron microscopy (TEM) analysis, the primary and crucial step in obtaining a high-quality image that can be interpreted reasonably is sample preparation. Inappropriate sample thickness, poor conductivity, or damage introduced during sample preparation can directly lead to abnormal electron beam penetration, image distortion, and even sample scrapping. TEM sample requirements ① T...
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What are nanoparticles? Nanoparticles (NPs) are typically defined as granular materials with at least one dimension at the nanoscale (1-100 nm) in three-dimensional space. From the dimensions of structure and morphology, nanoparticles can be classified into zero dimensional nanomaterials (0D nanomaterials), corresponding to one-dimensional (1D) and two-dimensional (2D) nanomaterials. 0D nanopartic...
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Why do nanoparticles aggregate? 1.Surface free energy driven mechanism Nanoparticles have a larger specific surface area and unsaturated surface atoms, leading to an increase in surface free energy. Multi particle contact can reduce the total surface area, release interfacial energy, and thus lower the system's free energy. This trend of energy minimization is the intrinsic thermodynamic driving f...
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1.Characterization of particle size and distribution Dynamic Light Scattering (DLS): DLS is one of the most commonly used techniques for measuring the particle size and distribution of nanoparticles in suspensions. It calculates the hydrodynamic diameter of particles by measuring the time-dependent light scattering intensity fluctuations caused by Brownian motion of particles. DLS can also provide...
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XRD is an important means of characterizing phases. Strictly speaking, it can determine the existence of a certain phase, but cannot determine the absence of a certain phase, making it easier to distinguish between truth and falsehood. So, what is its detection limit? Firstly, we must emphasize that XRD analysis of elemental content is very inaccurate. If we have to say what the detection limit is...
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Powder surface modification changes the surface state of particles through physical or chemical means, with the core being to break the agglomeration force between particles. When the particle size of the powder decreases to the micrometer or nanometer level, the surface energy sharply increases, and van der Waals forces, hydrogen bonds, and other gravitational forces cause the particles to sponta...
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