Platy

Talc products are also characterized by their crystallinity or relative platiness. Mycrocrystalline talc products typical of Montana and AustraUa tend to have very fine natural grain sizes and thus are ea sily milled to very fine products of higher surface area (10—20 m /g). Macrocrystalline talc ores... 

Paper. Paper is the principal apphcation for talc throughout the world. It is used as a filler, a coating pigment, and a process aid in pulping and de-inking for pitch and stickies control. As a paper filler, talc is used because of its platiness, softness, whiteness, abiUty to space Ti02, and ink receptivity. 

Nonfibrous Reinforcements. Because of the higher costs associated with nonasbestos fibers and the performance requirements needed in replacing asbestos, platy minerals such as mica and talc, and metal powders such as iron and copper, are being used as a portion of the total reinforcement package in NAOs. 

J) The extreme fineness of iadividual clay particles, which may be of colloidal size ia at least one dimension. Clay minerals are usually platy ia shape, and less often lathlike and tubular or scroU shaped (13). Because of this fineness clays exhibit the surface chemical properties of coUoids (qv) (14). Some clays possess relatively open crystal lattices and show internal surface colloidal effects. Other minerals and rock particles, which are not hydrous aluminosihcates but which also show colloidal dimensions and characteristics, may occur intimately intermixed with the clay minerals and play an essential role. 

Clay and talc are the most common fillers in rubber base adhesive formulations. Both have platy shapes favouring the interactions with elastomers. 

Crystallises m plati s uiili im d( imiii nu point, as the aeiti passes into the di uh on iRaiiir.t Soluhlt in alcohol and in hot water, slii htK soliiMe m t old uan i... 

Kaoliniie, nacrilc, dickite Antigorilc (platy serpentine)... 

Platin-hydroxyd, n. platinum hydroxide, specif, platinic hydroxide, platinum(IV) hydroxide, -hydroxydul, n. platinous hydroxide, plati-num(II) hydroxide. 

Though many of the products shown in Figure 3.15 are clearly plati-num(II) species, some are formally platinum(O). 

The k2 term suggests a simple bimolecular process in which nucleophilic attack by Y leads to a SN2 reaction. Associative paths will involve a 5-coordinate (sp or tbp) intermediate, and the relative rarity of isolable 5-coordinate plati-num(II) species - compared with 4-coordinate - is not inconsistent with their involvement as reactive intermediates (Figure 3.81). 

In the Cambridge Structural Database [39] only two macrocyclic molecules with transition metals, in which the metal ions are joined only by imidazolyl units, have been reported. One structure is trimetallic and contains plati-num(II) [40a] and the second one is tetrametallic with copper(II) ions [40b]. 

The structure was solved by the multiple isomorphous replacement technique using four heavy atom derivatives uranyl acetate, plati-nous chloride, tetramethyllead acetate, and p-chloromercury benzoate. All four derivatives gave interpretable heavy atom Patterson syntheses. The heavy atom sites could be correlated between the de-... 

Leung L-WH, Wieckowski A, Weaver MJ. 1988. In situ infrared spectroscopy of well-defined single-crystal electrodes Adsorption and electrooxidation of carbon monoxide on plati-nuk(lll). J Phys Chem 92 6985-6990. 

C12H18N505+,I 1,7-Dimethylguanosine iodide (DMGUNI10)343 C15H11ClN3Pt+,C10H13N5O7P--2.25 H20 Chloro(terpyridyl)plati-... 

C23H32NloOjgP2 0.4 dihydrate Sodium (trimethylenediamine)bis(inosine 5 -phosphato)plati- INOSPU 43 374... 

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