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Introduction

The dispersion of nanoparticles has always been the key and difficult point in the application of nanomaterials. If the nanoparticles are not sufficiently dispersed, the properties of nanomaterials cannot be brought into play. Alfa Chemistry offers a variety of nanoparticle dispersions for different types of nanoparticles (such as metal hydroxides and non-metal nanoparticles) with different particle sizes. Our products exhibit excellent dispersion, significantly enhancing the feasibility of nanomaterial applications.

With an extensive selection of product specifications and categories, we cater to various applications and usage requirements. Furthermore, our team of nanodispersion experts can select the most suitable nanoparticle dispersion tailored to specific application needs, including particle size and solvent compatibility, while providing comprehensive technical guidance to clients.

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• Nickel hydroxide (Ni(OH)₂) nanoparticle dispersion

The incorporation of second-phase nanoparticles into ceramic matrices stands as the prevailing method for fabricating cermet-ceramic composites (CerMets). The colloidal process can achieve a high degree of dispersion of nanoparticles within the ceramic matrix, further promoting seamless integration between the nanoparticles and the matrix.

Nickel (Ni) is the most commonly utilized metal for reinforcing ceramic substrates, where it enhances their catalytic and mechanical properties. Non-metallic precursors of the nickel phase, nickel hydroxide, exhibit high compatibility with the ceramic phase. Consequently, nickel hydroxide nanoparticle dispersions can be seamlessly incorporated into the matrix through a colloidal process. Subsequent sintering of the composite material in a reducing atmosphere leads to the reduction of nickel hydroxide into metallic nickel, further enhancing the composite's functional properties ^[1].

Figure 2. FESEM and TEM micrographs of nickel hydroxide ^[1].

• Aluminum hydroxide (Al(OH)₃) nanoparticle dispersion

Aluminum hydroxide serves various purposes, including as a flame retardant additive in polymers, an abrasive medium in soft polishing operations like toothpaste, a precursor to catalysts, and a water treatment filter ^[2]. However, due to the tendency of aluminum hydroxide to condense to varying degrees during storage or transportation, an aluminum hydroxide nanoparticle dispersion is necessary to prepare that enhances the stability of aluminum hydroxide. The dispersion can also increase the production efficiency of aluminum hydroxide during its usage, and broaden the application scope of nano-aluminum hydroxide across multiple scenarios. Typically, the dispersion of aluminum hydroxide particles can be achieved through mechanical dispersion, ultrasonic dispersion, or chemical dispersion.

Figure 3. SEM and TEM for Al(OH)₃ ^[2].

Alfa Chemistry is able to provide customers with a wide range of colloidal dispersions. For further details, please refer to our product list accessible via the link provided at the top of the page.

References

1. Cabañas, P. S.; et al. Colloidal stability of Ni(OH)₂ in water and its dispersion into a ceramic matrix from the reaction media to obtain Ni/Al₂O₃ materials. Boletin de la Sociedad Espanola de Ceramica y Vidrio. 2015, 53(6): 265-274.
2. Souza, A. D. V.; et al. Characterization of aluminum hydroxide (Al(OH)₃) for use as a porogenic agent in castable ceramics. Journal of the European Ceramic Society. 2015, 35: 803–812.

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