有序介孔材料与石墨化纳米点的自嵌入超组装

近二十年以来,介孔材料已发展成为多孔材料的最重要领域之一~(1-3)。由于其具有高的比表面积、纳米尺寸的规整孔结构、丰富可调的骨架组成和表面性质,介孔材料为实现大分子的扩散与转化、能量的高效利用与储存等提供了难得的机遇和广阔的空间,并在电池、光伏、光电子、流体器件、传感器、离子交换、药物传送和催化领域有着广阔的应用前景~(4-6)。其中,通过在介孔材料的孔道或孔墙内部引入具有不同特性的客体

C2H2 Treatment as a Facile Method to Boost the Catalysis of Pd Nanoparticulate Catalysts

Zheng, NF (通讯作者)A facile method to boost the catalysis of Pd nanoparticulate catalysts by simple C2H2 treatment is developed. During the C2H2 treatment, Pd nanoparticles serve as active catalysts to polymerize C2H2 into transpolyacetylene. The deposition of trans-polyacetylene layer on Pd nanoparticles makes their surface hydrophobic. Such a hydrophobic surface modification helps to accumulate more hydrophobic substrates during catalysis, making the modified Pd nanoparticulate catalysts more active than untreated catalysts in the catalytic reaction involving hydrophobic substrates. Moreover, the coating of polyacetylene on Pd creates encapsulated Pd nanocatalysts, stabilizing Pd nanoparticles against sintering or aggregation. Since the catalytic polymerization of polyacetylene on Pd is not facet dependent, the development is readily applied to enhance the catalysis of commercial Pd nanoparticulate catalysts by simple C2H2 treatment.MOST of China 2011CB932403 NSFC 21131005 2133300

Stabilizing subnanometer Ag(0) nanoclusters by thiolate and diphosphine ligands and their crystal structures

MOST of China [2011CB932403]; NSFC [21131005, 21021061, 20925103]; Fok Ying Tung Education Foundation [121011]The combined use of thiolate and diphosphine as surface ligands helps to stabilize subnanometer Ag(0) nanoclusters, resulting in the successful crystallization of two Ag(0)-containing nanoclusters (Ag-16 and Ag-32) for X-ray single crystal analysis. Both clusters have core-shell structures with Ag-8(6+) and Ag-22(12+) as their cores, which are not simply either fragments of face-centered cubic metals or their fivefold twinned counterparts. The clusters display UV-Vis absorption spectra consisting of molecule-like optical transitions

One-Pot, High-Yield Synthesis of 5-Fold Twinned Pd Nanowires and Nanorods

通讯作者地址: Zheng, NF (通讯作者), Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] the presence of poly(vinylpyrrolidone) and I-, uniform Pd nanowires and nanorods have been successfully prepared. As-prepared one-dimensional Pd nanostructures have a 5-fold twinned structure. The twinned Pd nanowires can be further transformed into nanowires/nanorods with a smaller aspect ratio and finally to multiply twinned particles upon increasing the reaction time. With structural anisotropy, the one-dimensional. Pd nanostructures exhibit different chemical reactivities on their tips and sides.Chinese Ministry of Education108077 RFDP 200803841010 NNSFC 20871100 20721001 MSTC 2009CB930703 2007C1381530

Adsorption of organic phosphorus in pesticide wastewater by CaAI hydrotalcite

采用共沉淀法制备了CaAl水滑石（CaAl-LDH），并运用扫描电子显微镜（SEM）和热重／差示扫描量热分析（TG—DSC）技术对CaAl-LDH的形貌及热稳定性进行了表征。采用CaAl-LDH对含膦农药废水进行除膦吸附试验，探讨了搅拌时间、pH值、CaAl-LDH的加入量对吸附性能的影响。结果表明：当CaAl-LDH的加入量为80g／L，搅拌时间为3h，pH值为6—8时，CaAl-LDH对膦的吸附性最强，废水中膦质量分数仅为0．1×10^-6。CaAl hydrotalcite （CaAl-LDH） was prepared by coprecipitation method. The morphology and thermal stability of CaAl-LDH was characterized by scanning electron microscopy （SEM） and thermogravimetry/differential scanning calorimetry （TG - DSC ）. The test of phosphine adsorption removal by CaAl-LDH from phosphine pesticide wastewater was carried out. The results showed that when the addition amount of CaAl-LDH was 80 g/L, the stirring time was 3 h, and the pH value was from 6 to 8, CaAl-LDH had the strongest adsorption to phosphine, and the mass fraction of phosphine in wastewater was only 0.1× 10^-6

Pd Nanoparticles Encapsulated in Hollow Mesoporous Aluminosilica Nanospheres as an Efficient Catalyst for Multistep Reactions and Size-Selective Hydrogenation

最近,具有中空核壳结构的纳米材料在催化领域中有着深入的研究和广泛的应用.在本文中,我们使用一种简单易行的方法合成了一种包裹钯纳米颗粒的中空介孔硅铝酸盐纳米球(简写为Pd@HMAn).首先,通过一种先原位合成钯纳米粒子再对其进行二氧化硅包裹的方法,在brIJ56-环己烷-水的反相胶束中合成了具有核壳结构的包裹钯纳米颗粒的二氧化硅纳米球(简写为Pd@SIO2).然后,使用CTAb,nA2CO3和nAAlO2试剂,通过简单的碱性条件下刻蚀Pd@SIO2的过程,我们成功得到了具有多孔性能的中空核壳型Pd@HMAn纳米催化剂.由于硅铝酸盐外壳具有酸催化作用,并且内核钯纳米颗粒又是一种高活性的催化媒介,因此,这种复合的多功能纳米催化剂能够很好的应用于多步催化反应中.此外,通过一个简单的热处理的方法,能够缩小硅铝酸盐外壳上的孔道,我们发现这种孔道调节后的Pd@HMAn纳米催化剂在尺寸选择性氢化反应中有很好的应用前景.In this work,yolk-shell structured Pd@hollow mesoporous aluminosilica nanospheres(designated as Pd@HMAN) have been successfully fabricated by a straightforward synthetic route.Core-shell Pd@SiO2 nanospheres were firstly obtained by silica coating of in-situ synthesized Pd nanoparticles in a Brij56-cyclohexane-water reverse micelle system.Simply by alkaline etching of as-prepared Pd@SiO2 core-shell nanospheres in the presence of CTAB,Na2CO3 and NaAlO2,Pd@HMAN particles with high porosity were obtained.As the mesoporous aluminosilica shells can serve as acid catalysts,and the Pd yolks can be applied to catalytic hydrogenation,the as-prepared Pd@HMAN can be used as a stable multifunctional catalyst for multistep reactions.Moreover,due to their adjustable pore parameters,Pd@HMAN after simple thermal treatment can be further applied in the size-selective hydrogenation.ProjectsupportedbytheMinistryofScienceandTechnologyofChina(No.2011CB932403); theNationalNaturalScienceFoundationofChina(Nos.21131005;21021061;20925103;20923004); theFokYingTungEducationFoundation(No.121011)~

Near-infrared light-triggered irreversible aggregation of poly(oligo(ethylene glycol) methacrylate)-stabilised polypyrrole nanoparticles under biologically relevant conditions

National Nature Science Foundation of China [21021061, 20925103]We report the use of near-infrared (NIR) radiation to trigger the irreversible flocculation of poly(oligo(ethylene glycol) methacrylate)stabilised polypyrrole nanoparticles in physiological buffer

Supported monodisperse Pt nanoparticles from [Pt-3(CO)(3)(mu(2)-CO)(3)](5)(2-) clusters for investigating support-Pt interface effect in catalysis

MOST of China [2011CB932403]; NSFC [21131005, 21021061, 20925103, 20923004]; Fok Ying Tung Education Foundation [121011]Here we present a surfactant-free strategy to prepare supported monodisperse Pt nanoparticles from molecular [Pt-3(CO)(3)(mu(2)-CO)(3)](5)(2-) clusters. The strategy allows facile deposition of same-sized Pt nanoparticles on various oxide supports to unambiguously study the interface effect between noble metal and metal oxide in catalysis. In this study, Fe2O3 is demonstrated to be a superior support over TiO2, CeO2 and SiO2 to prepare highly active supported Pt nanoparticles for CO oxidation, which indicates that the interfaces between Pt and iron oxide are the active sites for O-2 activation and CO oxidation

Facile synthesis of size-tunable ZIF-8 nanocrystals using reverse micelles as nanoreactors

电子邮件地址:[email protected] paper describes a robust method for the synthesis of high-quality ZIF-8 nanocrystals using reverse micelles as discrete nanoscale reactors. The precise size control of ZIF-8 nanocrystals is conveniently achieved by tuning the concentration of precursors, reaction temperatures, the amount of water, and the structure of surfactants. The as-synthesized ZIF-8 nanocrystals are of narrow distribution and tunable size. A size-dependent catalytic activity for Knoevenagel condensation reaction is further demonstrated by using ZIF-8 nanocrystals with different sizes as the catalysts. This facile method opens up a new opportunity in the synthesis of various ZIFs nanocrystals.Ministry of Science and Technology of China 2011CB932403 National Natural Science Foundation of China 21131005 21333008 20925103 2102106

Sub-10-nm Pd Nanosheets with Renal Clearance for Efficient Near-Infrared Photothermal Cancer Therapy

通讯作者地址: Zheng, NF (通讯作者)Efficient renal clearance is of fundamentally important property of nanoparticles for their in vivo biomedical applications. In this work, we report the successful synthesis of ultra-small Pd nanosheets (SPNS) with an average diameter of 4.4 nm and their application in photothermal cancer therapy using a near infrared laser. The ultra-small Pd nanosheets have strong optical absorption in the NIR region and high photothermal conversion efficiency (52.0%) at 808 nm. After being surface-functionalized with reduced glutathione (GSH), the SPNS-GSH was administered to mice to investigate the biodistribution, photothermal efficacy and tumor ablation in vivo. The in vivo photothermal therapy studies clearly demonstrate that surface modification with GSH allows the nanosheets to exhibit prolonged blood circulation and thus high accumulation in tumors. Upon 808 nm NIR irradiation, the tumors can be completely ablated. More importantly, with the size below the renal filtration limit (<10 nm), the GSHylated Pd nanosheets can be nicely cleared from body through the renal excretion route and into urine. Together with the high efficacy of NIR photothermal therapy, the unique renal clearance properties make the ultra-small Pd nanosheets promising for practical use in photothermal cancer therapy.MOST of China 2011CB932403 2014CB932004 NSFC of China 21131005 2092510