Micropipe Reactions in Bulk SiC Growth

Ion-Exchange Synthesis and Enhanced Visible-Light Photoactivity of CuS/ZnS Nanocomposite Hollow Spheres

“…43 In a low relative pressure range (below 0.2), the isotherms a high adsorption, indicating the presence of micropores (type I), implying that the samples still contain a small amount of the amorphous phase. [52][53][54] However, in the high relative pressure range of 0.4-1, the curve exhibits two small hysteresis loops, indicating bimodal pore-size distributions in the mesoporous and macroporous regions. The shapes of the two hysteresis loops are different from each other.…”

“…43,[51][52][53][54] The bimodal pore-size distributions are ascribed to two different pores: fine intra-aggregated pores formed between intra-agglomerated primary crystallites and large interaggregated pores produced by interaggregated secondary particles. 52 The bimodal pore-size distributions are further confirmed by its corresponding pore-size distribution (Figure 5b). Figure 5b indicates that the samples contain micropores (below 2 nm), small mesopores (peak pore at ca.…”

“…17,59 Third, the hollow spheres possess an unusual hierarchically nanoporous structure, which allows more efficient transport for the reactant molecules to get to the active sites on the framework walls, hence, enhancing the efficiency of photocatalysis. 52 Moreover, the hollow structure can enhance to some extent pollutant entrapment and sequestration within the enclosed microspheres. 9 Experiments also show that hollow spheres can be more readily separated from the slurry system by filtration or sedimentation after photocatalytic reaction and reused than nanosized powder photocatalytic materials due to their large weight, weak Brownian motion, and good mobility.…”

“…However, at a high relative pressure, between 0.8 and 1.0, the hysteresis loop is of type H3, which is associated with slitlike pores. 43,[51][52][53][54] The bimodal pore-size distributions are ascribed to two different pores: fine intra-aggregated pores formed between intra-agglomerated primary crystallites and large interaggregated pores produced by interaggregated secondary particles. 52 The bimodal pore-size distributions are further confirmed by its corresponding pore-size distribution (Figure 5b).…”

Fabrication of TiO2nanotubes-assembled hierarchical microspheres with enhanced photocatalytic degradation activity

“…To compare the reaction kinetics of TiO 2 NTs and TiO 2 NTMs, we assume that MO follows the first-order rate law, Àln (C/C 0 ) = kt, where k is the apparent rate constant for degradation. Nanotubesassembled microsphere structures allow for multireflections of trapped incident UV-light among subunits and within their pore channels, thus allowing more efficient use of the irradiated light, which would extend the absorption to the long-wavelength region 48 and reduce the recombination opportunities for the photogenerated electron-hole pairs. 7(b) shows the linear relationship of Àln (C/C 0 ) with irradiation time.…”