Pinnavaia, "Mechanism of clay tactoid
exfoliation in epoxy-clay nanocomposites," Chemistry of Materials, vol.
After blending of polymer with clays, several possible structures can exist: (a) tactoid
, where polymer surrounds clay platelets, (b) intercalate, where polymer chains enter between parallel clay platelets, (c) disordered intercalate, where clay platelets are not parallel, and (d) exfoliated, where clay platelets are separated and dispersed in the resin.
In this case, the dispersion of nanofiller in epoxy can be categories according to gallery spacing or the gap between two adjacent platelets (d-spacing) which are tactoid
, intercalated and exfoliated.
Some nanocomposites may be formed in tactoid
structures, which are structures of conventional composite, for cost reduction, but the nanocomposite plays a small role in property improvement.
V Coveney, "Chemically specifi C multiscale modeling of clay-polymer nanocomposites reveals intercalation dynamics, tactoid
self-assembly and emergent materials properties," Advanced Materials, vol.
The cells lie in a lace-like eosinophillic pericellular material and produce a tactoid
Blackmore AV, Miller RD (1961) Tactoid
size and osmotic swelling in Ca montmorillonite.
Whorling of tumor cells reminiscent of tactoid
differentiation and hyalinized nodules was noted in 5 cases.
Pathologic findings in a renal biopsy (including glomerular intracapillary globular accumulations of eosinophilic material containing precipitated cryoglobulins, and glomerular immune complex deposits with a finely fibrillar or tactoid
pattern of organization visualized by electron microscopy) can sometimes be the first clue to a diagnosis of cryoglobulinemia and corresponding HCV infection.
The morphologic features, which if present in combination help confirm the diagnosis of MPNST, include (a) alternating hypocellular-hypercellular regions; (b) appearance of a thin wavy or comma-shaped nucleus, particularly in hypocellular areas; (c) presence of nuclear palisading; (d) presence of nervelike whorls or tactoid
bodies resembling Wagner-Meissner corpuscles; (e) prominent thick-walled vasculature; and (f) the presence of heterologous elements.
Banin and Lahav (1968) reported that the average number of plates per tactoid
of Ca-montmorillonite was 6-10.
At higher CNF loading (5%), tactoid
aggregation morphology was observed in the composite prepared via solvent dispersion route (Figure 2(d)).