The paste hydration of brownmillerite with and without gypsum: a time resolved synchrotron diffraction study at 30, 70, 100 and 150 °C

H2S–CO2 reaction with hydrated Class H well cement: Acid-gas injection and CO2 Co-sequestration

“…The ferrite phase resembles an impure form of the mineral brownmillerite, often considered to be its mineral equivalent. This phase can contain up to 10% impurities and has a significantly variable Al/Fe ratio (Meller et al, 2004). The ferrite tends to be more enriched in ferric-iron in oil well cements than in typical construction cements, and the tricalcium aluminate (cement chemistry notation: C 3 A) is absent or present only in trace amounts (Meller et al, 2004).…”

The Novel Additive 1‐Naphthalenethiol Opens a New Processing Route to Efficiency‐Enhanced Polymer Solar Cells

“…, [ 42 ] the hole mobility µ h values of 1.95 × 10 −4 , 2.75 × 10 −4 , and 2.03 × 10 −4 cm 2 V −1 s −1 respectively for the active layers processed with DIO, SH-na, and that without additive but with the dipping treatment. These values are increasingly better than 9.12 × 10 −5 cm 2 V −1 s −1 obtained for the active layer processed without any additive nor the dipping treatment.…”

Solubility of Fe–ettringite (Ca6[Fe(OH)6]2(SO4)3·26H2O)

“…Iron is a ubiquitous element in natural environments, and Portland cement clinker contains $5% to 15% ferrite (idealised Ca 2 (Al x Fe 1Àx ) 2 O 5 ). It has been observed in Portland cement systems that Fe(III) partly exchanges for Al(III) in the lattice of ettringite and AFm-phases (Fukuhara et al, 1981;Emanuelson and Hansen, 1997;Csizmadia et al, 2001;Meller et al, 2004). AFm is the cement short hand notation for Ca 4 (Al,Fe) 2 (OH) 12 AE (X)yH 2 O where X denotes two formula units of a singly charged anion or one formula unit of a doubly charged anion.…”