ZrO2超细粒子的制备、表征与CO加氢反应性能

利用液相沉淀法在有机溶剂中制备了ＺｒＯ２超细粒子，运用航向电镜（ＴＥＭ）、Ｘ射线衍射（ＸＲＤ）和差热－热重（ＤＴＡ－ＴＧ）等分析手段对粉体进行了表征。结果表明，粒子颗粒均匀、分散性良好，平均粒径为２５ｎｍ。实验还发现，制备还发现，制备过程在有机溶剂中进行并采用低温热处理方法可以有效地排除溶胶水中的影响，从而大量消作合成粉体中硬团聚体生成的现象，在自制的ＺｒＯ２超细粒子和大颗粒的商品ＺｒＯ２上进行了     

纳米级均分散氧化钇粉末的制备

运用素分解法及“交替淬冷－快热”技术，成功地制备了经钇的纳米级均分散胶体粒，运用ＴＥＭ对产物分析后发现颗粒分散性好，分布窄，呈规则球形。最小粒径为６５ｎｍ。并对产物进行纯度分析，确定了杂质元素及含量。详细讨论了“交替淬冷－快热”技术运用于配方的基本原理。     

液相沉淀法在有机溶剂中制备ZrO2超细粒子的研究

以氧氯化锆（ＺｒＯＣｌ２·８Ｈ２Ｏ）为原料在有机溶剂中用液相沉淀法制备了ＺｒＯ２超细粒子，运用透射电镜（ＴＥＭ）、Ｘ射线衍射（ＸＲＤ）、差热热重（ＤＴＡＴＧ）等分析手段对粉体ＺｒＯ２进行了表征。结果表明，ＺｒＯ２粒子颗粒均匀、分散性良好，平均粒径为２５ｎｍ。实验还发现，制备过程在有机溶剂中进行，并采用低温热处理的方法可以有效地排除溶胶中水的影响，从而消除了合成粉体中硬团聚体生成的现象。     

纳米尖晶石型Co2MnO4的形成过程及其F-T反应性能

用溶胶凝胶法制备了尖晶石型Ｃｏ２ＭｎＯ４超细粒子，用ＤＴＡＴＧ，ＸＲＤ，ＴＥＭ，ＦＴＩＲ等手段研究了Ｃｏ２ＭｎＯ４超细粒子的形成过程，进而用反应评价结合ＸＲＤ，ＸＰＳ，ＢＥＴ比表面积测试研究了Ｃｏ２ＭｎＯ４催化剂的比表面积和表面结构与其ＦＴ反应性能间的关系．结果表明，Ｃｏ２ＭｎＯ４超细粒子可以在较低温度（２５０～３５０℃）下形成，并具有粒度小，分布均匀等特点．用该法制备的超细粒子Ｃｏ２ＭｎＯ４，其催化活性明显优于相同组成的大颗粒催化剂．     

用XRD,TEM和FTIR研究镜煤在CS2—N—甲基—2—吡咯烷酮混合溶剂中的溶解行为

用ＸＲＤ、ＴＥＭ和ＦＴＩＲ对淮北童亭镜煤和徐州庞庄镜煤原煤及其在ＣＳ２Ｎ甲基２吡咯烷酮混合溶剂中的萃取物和萃余物进行了分析。结果表明，在混合溶剂中溶解性较高的是煤中富含脂肪族侧链和酚、醇、醚结构的成分；除去溶剂后的萃取物经ＸＲＤ分析呈微晶层片结构，用ＴＥＭ可观察其呈微细碎片状，萃余物中的有机质则为无定形颗粒；推测淮北童亭镜煤的溶解为“剥离型”，而徐州庞庄镜煤的溶解则为“渗透型”。     

TS—1分子筛的合成

利用＾２９Ｓｉ和＾１ＨＮＭＲ方法研究了ＴＳ－１分子筛合成过程中正硅酸乙酯（ＴＥＯＳ）的水解行为，＾１ＨＮＭＲ结果表明，ＴＥＯＳ在四丙基氢氧化铵（ＴＰＡＯＨ）溶液中的水解速度快于在四乙基氢氧化铵（ＴＥＡＯＨ）中的水解速度，ＴＥＯＳ水解后的＾２９ＳｉＮＭＲ谱显示，ＴＥＯＳ在ＴＰＡＯＨ中水解产生的合硅酸根物种的分布与ＴＥＡＯＨ中的类似，都存在着单体、二聚、三聚及环聚等硅酸根物种的平衡，但ＴＥＯＳ－ＴＥＡ     

THE NON－TEMPLATE SYNTHESIS OF MACROCYCLIC SCHIFF BASE DERIVED FROM THIOPHENE，AND ITS Ag（Ⅰ），Hg（Ⅱ） COMPLEXES

ＴＨＥ　ＮＯＮ－ＴＥＭＰＬＡＴＥ　ＳＹＮＴＨＥＳＩＳ　ＯＦ　ＭＡＣＲＯＣＹＣＬＩＣ　ＳＣＨＩＦＦ　ＢＡＳＥ　ＤＥＲＩＶＥＤ　ＦＲＯＭ　ＴＨＩＯＰＨＥＮＥ，ＡＮＤ　ＩＴＳ　Ａｇ（Ⅰ），Ｈｇ（Ⅱ）　ＣＯＭＰＬＥＸＥＳＴＨＥＮＯＮ－ＴＥＭＰＬＡＴＥＳＹＮＴ...     

6－0－DEMETHYL－（19S）－DIHYDROETORPHINE， A NEW SYNTHETIC COMPOUND， ISOLATED FROM CRUDE DIHYDROETORPHINE AS A MINOR BY－PRODUCT

６－０－ＤＥＭＥＴＨＹＬ－（１９Ｓ）－ＤＩＨＹＤＲＯＥＴＯＲＰＨＩＮＥ，　Ａ　ＮＥＷ　ＳＹＮＴＨＥＴＩＣ　ＣＯＭＰＯＵＮＤ，　ＩＳＯＬＡＴＥＤ　ＦＲＯＭ　ＣＲＵＤＥ　ＤＩＨＹＤＲＯＥＴＯＲＰＨＩＮＥ　ＡＳ　Ａ　ＭＩＮＯＲ　ＢＹ－ＰＲＯＤＵＣＴ６－０－...     

THE ATOMIC WEIGHT OF CERIUM

ＴＨＥ　ＡＴＯＭＩＣ　ＷＥＩＧＨＴ　ＯＦ　ＣＥＲＩＵＭＴＨＥＡＴＯＭＩＣＷＥＩＧＨＴＯＦＣＥＲＩＵＭ￥ＴｓｉｎｇＬｉｅｎＣＨＡＮＧ．（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ１００８７１）ＹｏｎｇＦ...     

以混合模板剂合成TS-1分子筛及其性能研究

以四丁基溴化铵（ＴＢＡＢｒ）＋四乙基氢氧化铵（ＴＥＡＯＨ，ｎ（ＴＢＡ＋）／ｎ（ＴＥＡ＋）＝１）或以四丙基溴化铵（ＴＰＡＢｒ）＋ＴＥＡＯＨ为模板剂，钛酸四丁酯和正硅酸乙酯为原料，于１７０℃水热合成出ＴＳ１分子筛．对合成的ＴＳ１样品进行了ＸＲＤ，ＦＴＩＲ，ＳＥＭ和ＢＥＴ比表面积分析，证实了样品中钛已进入Ｓｉｌｉｃａｌｉｔｅ１骨架．选择戊烷氧化为探针反应，考察了ＴＳ１的催化活性．结果表明以ＴＥＡＯＨ为碱，合成的样品晶粒较大，达到４～１０μｍ，用氨水和ＴＥＡＯＨ调节反应液的碱度，对晶体的生长和形貌的影响各不相同．文中还就ＴＥＡＯＨ引入的作用进行了讨论．     

超增溶胶团自组装合成纳米氧化铝

应用超增溶胶团纳米自组装原理,以硝酸铝和尿素为熔盐,聚异丁烯马来酸三乙醇胺为表面活性剂制备超增溶氢氧化铝胶团,然后以氢氧化铝为前躯体合成纳米氧化铝.采用BET、压汞法、SEM、TEM和XRD方法对合成的氧化铝进行表征.结果表明,纳米氧化铝粒子形状为球形体或棒状体,孔道在几十纳米到几百纳米,粒度分布均匀且纯度较高.     

Preparation of monodisperse SiO2 nanoparticles by membrane emulsification using ideally ordered anodic porous alumina

Monodisperse SiO2 particles of nanometer dimensions were fabricated by membrane emulsification using ideally ordered anodic porous alumina. For the preparation of monodisperse emulsion droplets, the dispersed phase was pressed through a porous alumina membrane into the continuous phase. After solidification treatment of the emulsion droplets, prepared spherical SiO2 nanoparticles with uniform sizes were obtained. From scanning electron microscope observation of the obtained particles, it was confirmed that the size distribution of SiO2 nanoparticles is relatively narrow.     

Selective surface chemistry using alumina nanoparticles generated from block copolymers

Developing orthogonal surface chemistry techniques that perform at the nanoscale is key to achieving precise control over molecular patterning on surfaces. We report the formation and selective functionalization of alumina nanoparticle arrays generated from block copolymer templates. This new material provides an alternative to gold for orthogonal surface chemistry at the nanometer scale. Atomic force microscopy and X-ray photoelectron spectroscopy confirm these particles show excellent selectivity over silica for phosphonic and carboxylic acid adsorption. As this is the first reported synthesis of alumina nanoparticles from block copolymer templates, characterizations via Fourier transform infrared spectroscopy, Auger electron spectroscopy, and transmission electron microscopy are presented. Reproducible formation of alumina nanoparticles was dependent on a counterintuitive synthetic step wherein a small amount of water is added to an anhydrous toluene solution of block copolymer and aluminum chloride. The oxidation environment of the aluminum in these particles, as measured by Auger electron spectroscopy, is similar to that of native aluminum oxide and alumina grown by atomic layer deposition. This discovery expands the library of available surface chemistries for nanoscale molecular patterning.     

Reaction kinetics of nanometric aluminum and iodine pentoxide

Owing to increasing threats of biological attacks, new methods for the neutralization of spore-forming bacteria are currently being examined. Thermites may be an effective method to produce high-temperature reactions, and some compositions such as aluminum (Al) and iodine pentoxide (I₂O₅) also have biocidal properties. This study examines the thermal degradation behavior of I₂O₅ mixed with micron and nanometer scale aluminum (Al) particles. Differential scanning calorimetry (DSC) and thermogravimetric (TG) analyses were performed in an argon environment on both particle scales revealing a non-reaction for micron Al and a complex multistep reaction for the nanometer scale Al. Results show that upon I₂O₅ decomposition, iodine ion sorption into the alumina shell passivating Al particles is the rate-controlling step of the Al–I₂O₅ reaction. This pre-ignition reaction is unique to nano-Al mixtures and attributed to the significantly higher specific surface area of the nanometric Al particles which provide increased sites for I⁻ sorption. A similar pre-ignition reaction had previously been observed with fluoride ions and the alumina shell passivating Al particles.     

嵌入硅基多孔氧化铝中的荧光染料的发光性质研究

3种不同的荧光染料被分别嵌入硅基多孔氧化铝模板中,并且在室温下得到了蓝光、绿光和红光波长的荧光发射.实验中同时观测到上述荧光光谱的蓝移现象.研究结果表明,荧光染料沉积在不同的模板(如硅基多孔氧化铝、多孔硅)中,其相互作用的机理是不同的.模板发光机制的差异将直接影响荧光染料的发光性质.     

Probing molecules adsorbed at the surface of nanometer colloidal particles by optical second-harmonic generation

It is observed that optical second-harmonic generation from molecules adsorbed at the surface of nanometer size colloidal particles occurs at angles as large as 90 degrees away from the fundamental beam direction. This phenomenon can be rigorously described by the nonlinear Rayleigh-Gans-Debye theory and used for probing molecules adsorbed on nanometer size colloidal particles.     

新型Ni-Mo/Al2O3加氢脱硫催化剂的研究

采用溶胶凝胶技术,制备了双结构Al2O3载体,用此改性载体制备了Ni-Mo/Al2O3催化剂,在中压固定床微反装置上考察了载体改性对催化剂上噻吩加氢脱硫(HDS)活性的影响,并用X射线粉末衍射、透射电镜、吡啶-红外光谱等分析方法对改性载体和催化剂进行了表征。结果表明,由铝溶胶改性载体制备催化剂的加氢脱硫活性均高于未改性载体制备的催化剂的催化活性。XRD和TEM结果表明氧化铝表面负载的铝溶胶经过干燥、焙烧后以纳米尺度的η-Al2O3状态存在,吡啶-红外光谱结果表明,改性氧化铝载体制备催化剂的弱B酸和弱L酸的酸量均提高,强L酸的酸量也明显增加。酸性、酸量的提高和纳米尺度η-Al2O3的存在是催化剂活性提高的主要原因。     

纳米级功能聚苯乙烯粒子组成研究

以聚过氧化物 (PPX)为引发剂和乳化剂制备纳米级聚苯乙烯粒子 .采用溶解溶胀法、红外光谱 (IR)、差示扫描量热分析 (DSC)、薄层色谱分离 (TLC)等测试手段对所制备聚苯乙烯 (PS)粒子的化学组成及其结构进行了研究 .结果发现PS纳米粒子主要由含有一定量未分解过氧化基团的PS PPX交联大分子组成 ,为进一步制备具有特殊性能的核 /壳结构高聚物奠定了基础 .     

Sorting of brownian rods by the use of an asymmetric potential

We present here a method for sorting nanometer scale brownian rods by using a switching asymmetric periodic potential. A two stage sorting process is used to isolate particles with specific dimensions, with acceptable sorting times as well as realizable potential barrier lengths. The method was tested using computer simulations. The ability to sort the nanometer scale anisotropic particles, such as gold nanorods, portends important applications in large scale data recording, photothermal surgery, and bioimaging.     

液相中蔗糖对硒纳米组装的调控与稳定作用研究

报道了关于液相中蔗糖对纳米硒组装和调控作用的研究.