Ceramic Nanoparticle/Monodisperse Latex Coatings

Abstract

Ceramic nanoparticle/monodisperse latex coatings with a nanoparticle-rich surface and a latex-rich body were created by depositing aqueous dispersions of monodisperse latex, approximately 550 nm in diameter, and nanosized ceramic particles onto substrates and drying. On the top surface of the dried coating, the latex particles are closely packed with nanoparticles uniformly occupying the interstitial spaces, and along the cross section, nanoparticles fill the spaces between the latex particles in the near surface region; a compacted latex structure, nearly devoid of nanoparticles, lies beneath. Cryogenic scanning electron microscopy images of partially dried coatings at successive drying stages reveal two important steps in forming this structure: top-down consolidation of latex particles and accumulation of nanoparticles in interstitial spaces among latex particles near the surface. A systematic study of the effect of processing conditions, including nanoparticle concentration, nanoparticle size, latex glass transition temperature, and drying conditions, on the final microstructure was carried out. The unique microstructure described above forms when the monodisperse latex is large enough to create pore channels for the transport of nanosized particles and the drying conditions favor "top-down" as opposed to "edge-in" drying.

Delamination behavior of lithium-ion battery anodes: Influence of drying temperature during electrode processing

“…Figure 7 schematically shows the component distribution in the electrode film at different times during the drying process. It depicts a mechanism introduced by Luo et al [27] which explains the formation of component gradients inside the drying electrode. In the initial state all components are distributed equally throughout the film (Figure 7, left).…”

Conducting Nanocomposite Polymer Foams from Ice‐Crystal‐Templated Assembly of Mixtures of Colloids

“…[24] This critical velocity is inversely proportional to the radius of the particle, but its determination suffers from great experimental uncertainties in values of Ds 0 and d. However, it is clear that the probability of entrapment of large particles is higher, as is indeed observed from our experiments ( We increased the complexity of our mixture of colloids by addition of a third colloidal component, carbon black particles with approximate diameters of 120 nm, which were dispersed with the aid of sodium dodecyl sulfate as surfactant. The overall weight percentage of carbon black particles in our experiments was 14 wt% with respect to the foam matrix.…”

“…Similar effects have been observed in composite polymer-latex films formed from a blend of silica nanoparticles and a poly(methyl methacrylate-co-butyl acrylate) latex. [24] The armored structure not only provides an enhanced mechanical stability of the composite polymer foams, but also introduces a unique and tailored surface functionality that can be of great value when these foams are used in areas that require adhesion or adsorption, such as chromatographic applications. Because of the surface excess of the nanoparticles, a nearly saturated functionalization is achieved at mass ratios of Ludox TM-40 colloidal silica nanoparticles and poly(vinyl laurate) particles of 0.46 and higher.…”

Aesthetically textured, hard latex coatings by fast IR-assisted evaporative lithography

“…Furthermore, IRAEL can be applied to blends of inorganic and organic particles [25] to create hierarchically-structured nanocomposites with nanoparticles periodically arranged over large distances [26,27]. Such materials promise useful optical, electrical and mechanical properties, and achieving control over particle assembly in a continuous polymer matrix remains a challenge [28], which can potentially be met by IRAEL.…”