Mechanistic understanding of silicon nitride dispersion using cationic and anionic polyelectrolytes

Malghan, S.G.; Premachandran, R.S.; Pei, P.

doi:10.1016/0032-5910(93)02792-9

Cited by 26 publications

(11 citation statements)

References 14 publications

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“…Powder-aggregation properties in water, such as suspension viscosity and aggregate-size distribution, have been characterized using a macroscopic approach. [2][3][4][5][6][7][8] Recently, new in situ investigation methods for the suspension structure and new devices for measuring surface and intermolecular forces 9 -11 have led to improved understanding of these forces. Furthermore, thermal or mechanical treatment, or molecule adsorption and other surfacetreatment methods, have been developed to control the aggregation behavior of fine particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Diameter on Surface Silanol Structure, Hydration Forces, and Aggregation Behavior of Alkoxide‐Derived Silica Particles

Kamiya

Mitsui

Takano

et al. 2000

Journal of the American Ceramic Society

102

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The effects of silica particle diameter on dispersion and aggregation behavior in water were analyzed, using alkoxidederived silica powders with particle diameters of 8 -260 nm. The present study focused on the relationships between the surface silanol structure and the interaction forces between solid surfaces in water. The surface silanol structure and interaction between particles were determined using Fourier transform infrared spectroscopy, Fourier transform nearinfrared spectroscopy, and atomic force microscopy. For relatively large particles (>30 nm in diameter), the surface silanols primarily were hydrogen-bonded silanols, and isolated silanols disappeared. The hydrogen-bonded silanols formed a hydrogen-bonded water layer on the particle surface; therefore, the additional hydration force was strong between these relatively large particles. In contrast, the surface density of isolated silanols increased as the particle diameter decreased to <30 nm, and the additional hydration force between ultrafine powders disappeared. The aggregation behaviors of alkoxidederived silica powders were dependent on the hydration force, which was changed by the surface silanol structure.

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Section: Introductionmentioning

confidence: 99%

Influence of Particle Diameter on Surface Silanol Structure, Hydration Forces, and Aggregation Behavior of Alkoxide‐Derived Silica Particles

Kamiya

Mitsui

Takano

et al. 2000

Journal of the American Ceramic Society

102

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“…Although the detailed dispersion mechanism is still unclear, because of insufficient information about Nopcosperse A44, the negatively ionized head group is believed to adsorb specifically onto the Si 3 N 4 surface with the stretched-polymer-chain conformation, which results in electrosteric stabilization. 23 A smaller amount of Nopcosperse A44, which is required to achieve a stable slurry, also is preferred when considering its possible adverse influence on the redispersion.…”

Section: Discussionmentioning

confidence: 99%

Slurry Chemistry Control to Produce Easily Redispersible Ceramic Powder Compacts

Moon

Grau

Cima

et al. 2000

Journal of the American Ceramic Society

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The slurry-based Three Dimensional Printing (3DP TM ) process requires the production of an easily redispersible powder bed from a well-dispersed slurry. Understanding and control of the interparticle potential in the dispersed state, as well as in the dry consolidated state, are important. The strength of the particle-particle interactions in the dry state determines the redispersion efficiency. One factor that controls the interparticle strength is the chemical stability of the ceramic powders in the dispersed state. For unstable powders, a partial dissolution and/or hydration of the powders can occur and eventually impede the redispersion by forming insoluble salt bridges at the necks of the particles. Redispersion of the powder bed can be improved substantially by weakening the strength of the particle-particle bonds. The formation of strong chemical bonds between particles should be avoided by adjusting the slurry pH to an appropriate range where the powders are chemically stable in the slurry. Replacement of the chemical bonds by soluble physical bonds, using a low-molecular-weight hydrophilic polymer, also reduces the interparticle strength and enhances redispersion.

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“…Table 1 shows the computed data of specific energy of interaction between the alumina powder surface and the additives. The value of specific energy of interaction (− G 0 SP ) in the case of albumin is more than double that in the case of DAC, which indicates stronger adsorption of albumin than DAC on alumina particles (6).…”

Section: Specific Energy Of Interactionmentioning

confidence: 99%

Effect of Additives on Electrokinetic Properties of Colloidal Alumina Suspension

Bhattacharjee

Singh

Besra

2002

Journal of Colloid and Interface Science

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Mechanistic understanding of silicon nitride dispersion using cationic and anionic polyelectrolytes

Cited by 26 publications

References 14 publications

Influence of Particle Diameter on Surface Silanol Structure, Hydration Forces, and Aggregation Behavior of Alkoxide‐Derived Silica Particles

Influence of Particle Diameter on Surface Silanol Structure, Hydration Forces, and Aggregation Behavior of Alkoxide‐Derived Silica Particles

Slurry Chemistry Control to Produce Easily Redispersible Ceramic Powder Compacts

Effect of Additives on Electrokinetic Properties of Colloidal Alumina Suspension

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