Characterization of Lower Paleozoic Water and Gas Distribution in Yan'an Gas Field, Ordos Basin.

The distribution of gas and water in the tight gas reservoirs is complex. This limits exploration and development compared to conventional resources. Elucidating the characteristics that control fluid distribution is critical to unlocking the tight gas potential.

(Hollow Au-Ag nanoparticles)-TiO2 composites for improved photocatalytic activity prepared from block copolymer-stabilized bimetallic nanoparticles.

Composite nanoparticles (NPs) containing a TiO2 outer shell and an inner core of hollow AuAg NPs (H-AuAg-NPs) were prepared using hollow AuAg NPs with block copolymer shells as templates, and their photocatalytic activities were investigated by the decomposition of methylene blue dye under UV irradiation. It was found that the H-AuAg-NP-TiO2 composite NPs showed higher photocatalytic activity than AuAg alloy-TiO2 composite NPs, Ag/TiO2 NPs and TiO2 NPs. In addition, the photocatalytic activity first increases with increasing the TiO2 content from 2.