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Pyrolysis of fibrous biomass followed by alkali (KOH and K2CO3) chemical activation the pyrolysis char for production activated carbon fibre matting material has been investigated. For KOH, initially involved melting KOH reaction with disorganised/volatile char, producing hydrogen gas K2CO3 further developing existing pore structure char. At higher temperatures (>700 °C), widening occurs due to...

Xenobiotics continue to be found that are metabolized in mammals to electrophilic reactants that form covalently bound adducts to cellular DNA leading to tumor formation. This discussion will be limited to the following two topics: sulfonation in chemical carcinogenesis and endogenous etheno adducts in DNA.

During the cementation of metallic restorations, the polymerization of dual-curing resin cements depends exclusively on chemical activation. This study evaluated the influence of chemical activation compared with dual-curing (chemical and light activation), on the hardness of four dual-curing resin cements. In a darkened environment, equal weight proportions of base and catalyst pastes of the c...

In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching rate were reported. Experimental data for leaching rate of gold were analyzed with the shrinking–core model. Results were consistent with chemical reaction control mechanism in the first 1 h of leachin...

Thermochromic printing inks could be security inks which respond to the color change when are being exposed to different temperatures. These inks with unusual chemical and physical specific characteristics are mostly produced for flexographic, screen and rotogravure printing systems under the supervision of skilled technical experts and with precise security controls. Since flexographic thermoc...