Yansheng Guo

Retraction Note to: Microenvironment characterization for a novel biocompatible hybrid carbon-silicon material

The compatible carbon-silicon complex materials originated from precursor diglycerylsilane (DGS) and sugar-modified silane N-(3-triethoxysilylpropyl)gluconamide (GLS) have gained substantial popularity by demonstrating admirable properties to stabilize entrapped biomolecules. The microenvironment inside these materials, especially the distribution of sugar moieties inside the matrix, which is likely the most critical factor determining compatibility of these materials, still remains unclear. To deeply investigate the biocompatibility mechanism of these materials, we have adopted two different preparation routes for these materials by introducing GLS into the starting DGS sol stage, but things are different after the DGS gel is formed. A fluorescence probe rhodamine 6G is introduced herein in the DGS sol to monitor the distribution of GLS moieties, as well as the evolution of the microenvironment inside resulting materials. All in all, the findings demonstrated that the timing of GLS addition plays a critical role in controlling the evolution of the inner structure of materials, suggesting that this factor provides a promising route to tune the properties of the resulting materials.

Effect of Aromatic Enrichment on Reactivity of FCC Slurry

Abstract Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H-NMR), carbon-13 nuclear magnetic resonance (13C-NMR), and group compositional analysis were used to characterize the synthesis reaction of fluidized catalytic cracking (FCC) slurry before and after solvent extraction treatment. This investigation provided a great deal of critical information for use in future process development. Before solvent extraction, the FCC slurry is extremely complex. Saturates content is relatively high, and there are a variety of aromatic ring substituents. In addition, molecular uniformity is poor and chemical steric hindrance is strong. On the contrary, the composition of a fraction enriched in aromatics is relatively simple with excellent uniformity and homogeneous molecular alkyl-substituents. The aromatic enriched fraction (FCCRF) from the FCC slurry has weak chemical steric hindrance and, consequently, is more reactive than the original FCC slurry.