Evolving surface properties of stirred wet milled aluminum-doped titanium dioxide: A discretely heterogeneous system

Role of sodium hexametaphosphate in ultra-fine grinding of alumina-doped titanium dioxide

“…Further details of the mill can be found in our previous publication. 6 Al-doped TiO2 suspensions were prepared at concentrations from 1.2 to 26.2 vol% in 10 -3 M NaCl at pH 4 (approximately the natural suspension pH). To ensure ionic equilibrium, between the particle surface and fluid, these suspensions were gently agitated for several hours prior to use.…”

“…1,5 To achieve this particle size distribution, wet stirred media milling is frequently used to reduce the aggregate particle size. 6 The method involves a rotating spindle and a fixed grinding chamber filled with small media beads. The spindle induces flow of the slurry and media beads, with particle size reduction occurring between two colliding media beads through singular or cumulative stresses (fatigue).…”

Relative CO2Column Height for CO2Geological Storage: A Non-Negligible Contribution from Reservoir Rock Characteristics

“…Rock pore size (i.e., quantified as average pore radius, R ) was determined from particle specific surface area (SSA) and total pore volume ( V p ), assuming a spherical geometry based on Brunauer–Emmett– Teller (BET) theory . The SSA was determined via nitrogen gas physisorption using an Autosorb 1 MP (Quantachrome, Austria) . The rock powder sample (0.1 g) was heated at 120 °C in a vacuum oven overnight and then degassed at 120 °C for a further 24 h before nitrogen adsorption was conducted .…”

“…In addition, the primary rock particle size ( D ) can also be estimated from the SSA and rock particle density (ρ rock ), assuming nonaggregated spherical particles To determine the total pore volume ( V p ), the total adsorbate volume should be measured at a relative pressure above the point where a hysteresis loop closes. The V p and respective R can be obtained as follows where W s is the weight of nitrogen adsorbed at a relative pressure ( ) of ∼ 1 and ρ nitrogen is the nitrogen density adsorbed on the particle surface at a relative pressure ( ) of ∼ 1.…”

“…51 The SSA was determined via nitrogen gas physisorption using an Autosorb 1 MP (Quantachrome, Austria). 52 The rock powder sample (0.1 g) was heated at 120 °C in a vacuum oven overnight and then degassed at 120 °C for a further 24 h before nitrogen adsorption was conducted. 53 The resulted adsorption is plotted as a linear relation (known as the BET plot) based on the BET equation, eq 8, and the SSA can be determined.…”