| 1 | Microenvironment characterization for a novel biocompatible hybrid carbon-silicon material显示文摘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. | SUI XiHua ZHA QingFang WU MingBo GUO YanSheng | 2009 | Science China Chemistry2009，52，8： | 0 |
| 2 | Preparation and Application of Silica-based Perfusion Packing of Size Exclusion Chromatography for Quantitation of Polyacrylamide in Enhanced Oil Recovery Systems显示文摘The synthesis and characterization of a novel macroporous silica derived size exclusion chromatography (SEC) packing for quantitative analysis of high molecular weight (MW) polyacrylamide (PAM) are presented. Using this packing, a fast, sensitive and reproducible approach for quantitation of super high-MW PAM in demanding enhanced oil recovery (EOR) waters was developed and the effect of synthesis parameters on the properties of resultant materials was investigated. These parameters include salt addition, reaction temperature and duration, activation condition of functional groups on the silica surface, as well as the reaction cycles required for optimal silica modification. Moreover, SEC analysis conditions, such as mobile phase composition, flow rate, detection and sample preparation, were also explored and an optimal analysis protocol was developed. Under this optimized SEC analysis conditions, the synthesized macroporous materials proved satisfactory for quantification of PAM with average MW up to 22 million Daltons. An SEC analysis required less than few minutes with a detection limit of 1 ng, a linear response range of 0.1 to 75 mg/L with squared R value of 0.99 and reproducibility better than 9.2% RSD (relative standard deviation). The analysis of PAM in highly saline oilfield production water containing interfering high MW polymeric surfactants indicated the recovery ranges from 92.5% to 110.1% for 1.0 mg/L PAM and 94.2% to 103.8% for 50 mg/L PAM solution. This study presented for the first time that the reliable quantization of high MW PAM in highly demanding EOR waters can be achieved by SEC. | Sui Xihua Zha Qingfang Wu Mingbo Guo Yansheng | 2007 | Petroleum Science2007，4，2： | 0 |
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