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Encapsulation of metal layers within metal-organic frameworks as hybrid thin films for selective catalysis

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Nano Research 2016年第1期9卷 158-164页

作者： zhiling xu Weina Zhang Jiena Weng Wei Huang Danbi Tian Fengwei Huo Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (Nanjing Tech) 30 South Puzhu Road Nanjing 211816 China College of Science Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China

A facile encapsulation strategy for the preparation of metal layer/metal-organic framework （metal/MOF） hybrid thin films, by alternately growing MOF thin films and sputter-coating metal layers, is reported. The controlled species of the MOF thin films and metal layers, as well as the designed thickness of MOF thin films, endow the resulting hybrid thin films with improved functional and design flexibility. Importantly, the metaL/MOF hybrid thin films, with well-defined sandwich structures, exhibit excellent selective catalytic activity, derived from MOFs acting as molecular sieves and the metal layers providing active sites.

关键词： metal-organic frameworks catalysis hybrid thin films metal layers composition

Effects of Inclusion of Chrysin in Cucurbit[8]uril on Its Stability, Solubility and Antioxidant Potential

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Chemical Research in Chinese Universities 2017年第5期33卷 736-741页

作者： xu zhiling LIAN Xiaowei LI Mengjie ZHANG Xiaodong WANG Yi TAO Zhu ZHANG Qianjun Research and Development Center of Fine Chemicals Guizhou University Guiyang 550025 P R. China Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province College of Chemistry and Chemical Engineering Guizhou University Guiyang 550025 P. R. China

The host-guest interaction between cucurbit[8]uril（Q[8]） and chrysin（CHR） has been studied by means of 1H NMR, mass spectrometry（MS）, differential thermal analysis（DTA）, and UV-Vis spectrophotometry. The results show that CHR forms a 1：1 inclusion complex with Q[8], with a binding constant of CHR with Q[8] by UV absorp- tion being 5.4 × 106. Phase solubility experiments show a 5.13-fold increase in the solubility of CHR through interac- tion with Q[8] {c（Q[8]）=10-4 real/L}. A study of the evolution of UV absorption spectra with time shows that Q[8] significantly increases the stability of CHR. The antioxidant activity of CHR-Q[8] has been tested by the ABTS me- thod. The CHR-Q[8] inclusion complex shows a better scavenging effect towards the ABTS radical than CHR, with respective IC50 values of 1.05 ×10-6 and 3.07× 10-6 mol/L. In vitro release studies have shown that CHR-Q[8] has a sustained release effcct.

关键词： Chrysin Cucurbituril hMusion complex Solubility Stability Antioxidant activity

Synthesis of chain-like MoS_2 nanoparticles in W/O reverse microemulsion and application in photocatalysis

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Chinese Science Bulletin 2012年第30期57卷 3862-3866页

作者： LIU MeiYing LI XiaoQian xu zhiling LI BoNa CHEN LinLin SHAN NanNan Institute of Chemistry.for Functionalized Materials Faculty of Chemistry and Chemical Engineering Liaoning Normal UniversityDalian 116029China

Chain-like MoS2assemblies consisting of hexagonal MoS2nanoparticles(20-60 nm) have been successfully synthesized in a Triton X-100/cyclohexane/hexanol/water W/O reverse microemulsion in the presence of(NH 4)2MoS 4 as the molybdenum source and NH2OH·HCl as the reducing *** products were characterized by X-ray powder diffraction(XRD),transmission electron microscopy(TEM) and UV-vis diffuse reflectance absorption *** influence of synthetic parameters such as acidity,water/oil ratio(0),aging time and annealing temperature on the formation of MoS2assemblies was *** analysis showed that these synthetic factors played important roles in controlling the size of MoS2nanoparticles and the length of the chain-like *** analysis indicated that the well-crystallized MoS2nanoparticles could be obtained by annealing the precursors at 700 C for2h under a flow of *** addition,the as-prepared chain-like MoS2nanoparticles exhibited excellent photocatalytic H2activity in Ru(bpy) 3 2+-MoS2-H2A three-component molecular systems under visible light irradiation.

关键词：微乳液合成二硫化钼纳米粒子反相微乳液光催化 O型链状 X射线粉末衍射

Spatial compartmentalization of metal nanoparticles within metal-organic frameworks for tandem reaction

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Nano Research 2022年第2期15卷 1178-1182页

作者： Ting Pan Islam E.Khalil zhiling xu Hongfeng Li Xinglong Zhang Gengwu Xiao Weina Zhang Yu Shen Fengwei Huo Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816China

Fabrication of multifunctional catalysts has always been the pursuit of synthetic chemists due to their efficiency,cost-effectiveness,and environmental ***,it is difficult to control multi-step reactions in one-pot,especially the spatial compartmentalization of incompatible active ***,we constructed metal-organic framework(MOF)composites which regulate the location distribution of metal nanoparticles according to the reaction path and coupled with the diffusion of substrates to achieve tandem *** designed UiO-66-Pt-Au catalyst showed good activity and selectivity in hydrosilylation-hydrogenation tandem reaction,because the uniform microporous structures can control the diffusion path of reactants and intermediates,and Pt and Au nanoparticles were arranged in core-shell spatial distribution in *** contrast,the low selectivity of catalysts with random deposition and physical mixture demonstrated the significance of artificial control to the spatial compartmentalization of active sites in tandem catalytic reactions,which provides a powerful approach for designing high-performance and multifunctional heterogeneous catalysts.

关键词： metal-organic frameworks metal nanoparticles spatial compartmentalization tandem reaction heterogeneous catalysis

反射干涉光谱法测量固体薄膜的光学常数和厚度

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光谱学与光谱分析 2000年第3期20卷 283-285页

作者：杨鹏徐志凌徐雷复旦大学物理系三束材料改性国家重点实验室上海200433

本文报道一种简单的方法 ,从平面介质薄膜的反射干涉光谱来计算薄膜的光学常数和厚度。当一束光照射在基板上的介质膜上时 ,由于膜上下界面反射光的相干 ,会使反射光谱的曲线有一定的波动。我们对反射相干光谱进行理论分析 ,给出计算公... 详细信息

本文报道一种简单的方法 ,从平面介质薄膜的反射干涉光谱来计算薄膜的光学常数和厚度。当一束光照射在基板上的介质膜上时 ,由于膜上下界面反射光的相干 ,会使反射光谱的曲线有一定的波动。我们对反射相干光谱进行理论分析 ,给出计算公式 ,从测量曲线中的实验值得出薄膜的光学常数 n、k以及厚度等参数。此种方法简单可行 ,而且易于编程处理。

关键词：薄膜反射干涉光谱折射率厚度

Salidroside Pretreatment to Mesenchymal Stem Cells Improves Cell Survival and Migration to Promote Diabetic Wound Healing

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医用生物力学 2019年第A1期34卷 141-142页

作者： Olivia Marcelina Jianqi Zhang Dyah Ari Nugrahaningrum zhiling xu Guixue Wang Li Yang Shourong Wu Vivi Kasim The Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing400044China State and Local Joint Engineering Laboratory for Vascular Implants Chongqing400044China The111Project Laboratory of Biomechanics and Tissue Repair College of BioengineeringChongqing UniversityChongqing400044China

Objective Diabetic patients pose a greater challenge in managing chronic wound healing,leading to a higher amputation risk compared to non-diabetic *** to their paracrine function by secreting various cytokines and angiogenic factors,mesenchymal stem cells(MSCs)have been acknowledged to be a potential agent in modulating wound healing ***,post-transplanted MSCs are vulnerable to death,indicating poor survival and migration ability in the wound site of the host,especially under *** hyperglycemia induces reactive oxygen species(ROS)generation and cellular apoptosis,improvement of MSCs survival and migration potentials under hyperglycemia could contribute to a more efficient MSCs-based wound healing ***(Sa),a small-molecule drug derived from Rhodiola plant,has been proved to enhance the paracrine function of skeletal muscle cells,as well as their migration even under ***,we investigated whether Sa could improve the survival and migration potentials of MSCs,subsequently enhance the wound healing process under *** MSCs were cultured under three conditions:low glucose,high glucose,and high glucose+*** analysis and western blotting were done to examine the mRNA and protein expression level of several factors which are important in upregulating the wound healing *** colorimetric assay,intracellular ROS detection,and flow cytometry assay were employed to examine the effect of Sa in MSCs *** chamber assay,scratch assay,and phalloidin staining were done to elucidate the role of Sa in regulating MSCs migration *** in vivo experiment,diabetic wound healing mice model was generated to elucidate the effect of Sa-pretreated MSCs transplantation in wound closure rate,as well as re-epithelization status,observed with hematoxylin and eosin *** diabetic wound healing mice model were divided into three groups:1)mice injected with PBS,2)mice transplant

关键词： salidroside mesenchymal stem cells cell survival cell transplantation diabetic wound healing

基于局部搜索NSGA-Ⅱ算法的机械产品分组选择装配方法

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中国机械工程 2022年第9期33卷 1127-1133页

作者：李好徐志玲徐勇赵有为中国计量大学质量与安全工程学院杭州310018 台州方圆质检有限公司台州318000 浙江天马轴承集团有限公司湖州313200

针对批量机械产品多目标要求下的分组选择装配问题,提出一种基于局部搜索的第二代非支配排序遗传算法(NSGA-Ⅱ)的分组选择装配方法。以装配精度和装配成功率为优化目标,构建基于质量损失函数和尺寸偏差的综合选择装配模型。采用浮点数... 详细信息

针对批量机械产品多目标要求下的分组选择装配问题,提出一种基于局部搜索的第二代非支配排序遗传算法(NSGA-Ⅱ)的分组选择装配方法。以装配精度和装配成功率为优化目标,构建基于质量损失函数和尺寸偏差的综合选择装配模型。采用浮点数和整数相结合的编码方式来描述分组选择装配方案,为获得分组选择装配方案中每个产品的封闭环实际尺寸,设计了一种解码方式。为了提高算法局部搜索能力,利用NSGA-Ⅱ混合模拟退火算法对分组选择装配问题进行求解,将成绩标量函数作为个体评价规则,实现了多目标要求下选择装配分组方案的优化。以某深沟球轴承的装配为例,验证了该方法的可行性和有效性。

关键词：选择装配装配质量分组方案多目标优化