An Injectable Hydrogel for Simultaneous Photothermal Therapy and Photodynamic Therapy with Ultrahigh Efficiency Based on Carbon Dots and Modified Cellulose Nanocrystals

The convenience of injectable hydrogels that can provide high loading of diverse phototherapy agents and further long-time retention at the tumor site has attracted tremendous interest in simultaneous photothermal and photodynamic cancer therapies. However, to incorporate the phototherapy agents into hydrogels, complex modifications are generally unavoidable. Moreover, these phototherapy agents usually suffer from low efficiency and work at different irradiation wavelengths outside the near infrared windows. Hence, a method for the fabrication of an injectable hydrogel for simultaneous photothermal therapy and photodynamic therapy, through the Schiff-base reaction between amido modified carbon dots (NCDs) and aldehyde modified cellulose nanocrystals is proposed. The NCDs act as both phototherapy agents and crosslinkers to form hydrogels. Significantly, the NCDs demonstrate an extremely high photothermal conversion efficiency of 77.6% which is among the highest levels for photothermal agents and a high singlet quantum yield of 0.37 under a single 660 nm light-emitting diode irradiation. The hydrogels are examined through in vitro and in vivo animal experiments which show nontoxic and effectively tumor inhibition. Thus, the strategy of direct reaction of phototherapy agents and the matrix not only provides new strategies for injectable hydrogel fabrication but paves a new road for advanced tumor treatment.     

碳酸钙分散状态对硅橡胶流变性能的影响

使用3种纳米活性碳酸钙为填料制备室温硫化硅橡胶材料,通过透射电子显微镜观察碳酸钙在硅橡胶中的分散状态,分析碳酸钙分散状态对其流变性能的影响。结果表明,碳酸钙在硅橡胶中的分散状态与其二次团聚程度有关,填料的团聚与网络结构化均会使硅橡胶的储能模量产生显著变化,温度扫描也能反映碳酸钙在硅橡胶中的分散状态。     

Enhanced visible light photocatalytic activity of QDS modified Bi2WO6 nanostructures

Bi₂WO₆ (BWO) nanostructures with QDS dispersed on single crystalline nanosheets were successfully prepared by a facile solvothermal method. The product possessed large surface area of 60 m²/g and exhibited excellent visible light absorption with a blue shift from 2.54 eV to 2.75 eV. The photocatalytic efficiency of the sample was six times that of nanoparticles assembled BWO nanostructures and three times that of nanoplates assembled BWO nanostructures. The photocatalytic mechanism for degradation of dyes over QDS modified BWO nanostructures was discussed, which revealed the important role of QDS in the generation, migration and consumption of the photogenerated electrons and holes.     

Au NPs@MoS2 Sub‐Micrometer Sphere‐ZnO Nanorod Hybrid Structures for Efficient Photocatalytic Hydrogen Evolution with Excellent Stability

MoS₂ shows promising applications in photocatalytic water splitting, owing to its uniquely optical and electric properties. However, the insufficient light absorption and lack of performance stability are two crucial issues for efficient application of MoS₂ nanomaterials. Here, Au nanoparticles (NPs)@MoS₂ sub‐micrometer sphere‐ZnO nanorod (Au NPs@MoS₂‐ZnO) hybrid photocatalysts have been successfully synthesized by a facile process combining the hydrothermal method and seed‐growth method. Such photocatalysts exhibit high efficiency and excellent stability for hydrogen production via multiple optical‐electrical effects. The introduction of Au NPs to MoS₂ sub‐micrometer spheres forming a core–shell structure demonstrates strong plasmonic absorption enhancement and facilitates exciton separation. The incorporation of ZnO nanorods to the Au NPs@MoS₂ hybrids further extends the light absorption to a broader wavelength region and enhances the exciton dissociation. In addition, mutual contacts between Au NPs (or ZnO nanorods) and the MoS₂ spheres effectively protect the MoS₂ nanosheets from peeling off from the spheres. More importantly, efficiently multiple exciton separations help to restrain the MoS₂ nanomaterials from photocorrosion. As a result, the Au@MoS₂‐ZnO hybrid structures exhibit an excellent hydrogen gas evolution (3737.4 μmol g^?1) with improved stability (91.9% of activity remaining) after a long‐time test (32 h), which is one of the highest photocatalytic activities to date among the MoS₂ based photocatalysts.     

新型环保橡胶助剂对氢化丁腈橡胶性能的影响及其在汽车同步带胶料中的应用

研究新型环保橡胶助剂增塑剂D810、分散剂WBP-100、助交联剂Ricobond 1756和改性酚醛树脂对氢化丁腈橡胶(HNBR)性能的影响及其在HNBR汽车同步带胶料中的应用。结果表明:增塑剂D810可有效代替传统增塑剂TOTM和TP-95用于HNBR中;分散剂WBP-100可改善HNBR的拉伸性能,提高硫化效率,在一定程度上延长HNBR汽车同步带的使用寿命;助交联剂Ricobond1756用量为2.5份可改善HNBR胶料的拉伸性能,使HNBR汽车同步带动态疲劳寿命延长约13%;新型改性酚醛树脂可有效提高HNBR胶料与尼龙帆布和玻璃纤维线绳的粘合性能。     

绿色建筑背景下基于BIM技术的建筑工业化发展机制研究

绿色建筑是建筑业高效、节能发展的必然趋势,建筑工业化是提高建筑业施工效率和质量的有效方式。建筑工业化是实现绿色建筑节能减排目标的有效途径之一,是建筑产业化的前提,是建筑施工理念和技术的重大变革。本文在绿色建筑背景下通过将BIM技术应用到建筑工业化领域,构建了基于先进BIM技术的建筑工业化发展模型,通过实证分析,为我国绿色建筑理念和建筑工业化发展相结合提供一个思考角度,进而为我国绿色建筑和建筑工业化研究体系的完善提供了参考。     

810酯/古马隆树脂并用对氢化丁腈橡胶性能的影响

研究液体邻苯二甲酸正辛正癸酯（810酯）/固体古马隆树脂并用比对氢化丁腈橡胶（HNBR）性能的影响。结果表明：810酯的增塑效果比古马隆树脂好;随着810酯/古马隆树脂并用比（总用量12份）减小,胶料的焦烧时间变化不大,硫化速度加快,硬度、拉断伸长率和粘合性能提高,拉伸强度略有下降,定伸应力和耐热老化性能先提高后降低;810酯/古马隆树脂并用比为8/4时,胶料的综合性能较好。     

The fabrication and mechanical properties of SiC/SiC composites prepared by SLS combined with PIP

Traditionally, SiC components with complex shapes are very difficult or even impossible to fabricate. This paper aims to develop a new manufacturing process, combining selective laser sintering (SLS), cold isostatic pressing (CIP) and polymer infiltration pyrolysis (PIP), to manufacture complex silicon carbide parts and improve the mechanical properties of silicon carbide ceramic parts. The density and porosity of SiC/SiC composites were measured. Furthermore, the mechanical properties of the specimens with cold isostatic pressing and the specimens without cold isostatic pressing were compared. The bending strength of the specimens with cold isostatic pressing was 201?MPa, and the elastic modulus was 1.27?GPa. And, the bending strength of the specimens without cold isostatic pressing was 142?MPa, and the elastic modulus was 0.88?GPa. Increasing the density of SiC/SiC can enhance the mechanical properties of SiC/SiC composites.     

Selective hydrogenation of acetylene over Pd/CeO2

Five hundred ppm Pd/CeO₂ catalyst was prepared and evaluated in selective hydrogenation of acetylene in large excess of ethylene since ceria has been recently found to be a reasonable stand-alone catalyst for this reaction. Pd/CeO₂ catalyst could be activated in situ by the feed gas during reactions and the catalyst without reduction showed much better ethylene selectivity than the reduced one in the high temperature range due to the formation of oxygen vacancies by reduction. Excellent ethylene selectivity of ~100% was obtained in the whole reaction temperature range of 50°C–200°C for samples calcined at temperatures of 600°C and 800°C. This could be ascribed to the formation of Pd_xCe_1−xO_2−y or Pd-O-Ce surface species based on the X-ray diffraction and X-ray photoelectron spectroscopy results, indicating the strong interaction between palladium and ceria.