任志威、丁新更、董泽 等 5 位作者2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
由正硅酸乙酯(TEOS),g-缩水甘油醚氧丙基三甲氧基硅烷(GPTMS)作为前躯体,端羟基硅油(PDMS)作为改性剂,通过溶胶凝胶技术制备的一种混凝土耐腐蚀涂层,二月硅酸二丁基锡(DBTL)作为Si—O—Si结构形成的催化剂,红外光谱分析结果说明正硅酸乙酯(TEOS)、g-缩水甘油醚氧丙基三甲氧基硅烷(GPTMS)和端羟基硅油(PDMS)有效地通过化学键形成一种有机/无机复合材料。涂膜后混凝土表面静态接触角由原来的40°增加到90°~110°,吸水率降低90%以上,并随着端羟基硅油的含量增加,疏水性增强。5%NaCl作为盐雾试验源,盐雾试验结果显示复合溶胶有8~14mm的降低氯离子渗透能力,结果说明复合溶胶有效增强了混凝的耐腐蚀能…
Microbial Applications in Construction MaterialsGrouting, Rheology, and Soil MechanicsMagnesium Oxide Properties and Applications
耿兵、金朝晖、邓春生 等 5 位作者2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
以重金属Cr(Ⅵ)为目标污染物,在两种实验条件下(实验柱Ⅰ为模拟污染水样,实验柱Ⅱ为实际污染水样)考察了壳聚糖稳定纳米铁对Cr(Ⅵ)的去除能力。实验柱Ⅰ和实验柱Ⅱ分别在第160PV和127PV时发生了击穿效应。与实验柱Ⅰ相比,实验柱Ⅱ中壳聚糖稳定纳米铁对Cr(VI)的去除能力降低了25%。SEM表征显示,实验柱Ⅱ中壳聚糖稳定纳米铁的表面形成了许多葡萄状晶体,它们的存在导致实验柱Ⅱ中纳米铁的去除能力明显低于实验柱Ⅰ。XPS表征显示,由于Ca和Mg的氢氧化物替代了部分铁氢氧化物,导致实验柱Ⅱ中壳聚糖稳定纳米铁表面Fe原子的相对含量低于实验柱Ⅰ。Cr元素高分辨率XPS能谱分析显示,在实验柱Ⅰ的条件下CKVI)被还原得更充分,而且在两种实…
Corrosion Behavior and InhibitionEnvironmental remediation with nanomaterialsChromium effects and bioremediation
阮琼、吴章梅、阮曌2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
研究在Mn(Ⅱ)和Tween-80存在下,二安替比林间羟基苯基甲烷(DAmHM)分光光度法测定痕量钒的最佳显色条件。研究结果表明,本体系最大吸收波长λmax=510 nm,表观摩尔吸光系数e=2.06×105L/mol.cm;在25 mL溶液中,钒(Ⅴ)的质量浓度在0~0.2μg/mL范围内符合朗伯-比尔定律。该体系选择性好,稳定时间长,应用于样品中微量钒的测定,结果满意。
Analytical Chemistry and SensorsSurface Roughness and Optical MeasurementsLanthanide and Transition Metal Complexes
Hwee Ting. Ling2012-01-01DR-NTU (Nanyang Technological University)
This study showed the comparison between conventional mesoporous silica nanoparticles (MSNPs) and hollow mesoporous silica nanoparticles (HMSNPs) in terms of their loading and releasing efficiency using Rhodamine-B (Rh.B) as hydrophilic model drug. The coating effect of polyethyleneimine (PEI) polymer on the surface o…
Mesoporous Materials and Catalysis
悄传新、周毓雯、Hui Liu 等 7 位作者2012-01-01河南师范大学学报:自然科学版
利用紫外吸收和荧光光谱法研究了不同钌(Ⅱ)配合物[Ru(bpy)2MDHIP]2+(MDHIP=2,4-二羟基-咪唑并[4,5-f]][1,10]邻菲咯啉)和[Ru(bpy)2ODHIP]2+(ODHIP=3,4-二羟基-咪唑并[4,5-f]][1,10]邻菲咯啉)与DNA的作用机制,并研究了这两个配合物与Cu2+的配位情况及配位形成双核配合物后的荧光性质变化.结果表明取代基的位置对配合物与DNA的作用机制及荧光性质等都具有较大影响.配体MDHIP上的2-位OH可以与相邻咪唑环上的N原子形成分子内氢键,增强配合物与DNA的插入作用.但其4-位OH取代基又会产生一定的位阻,使配合物只能以部分插入模式与DNA作用.而配体ODHIP上3…
Metal complexes synthesis and propertiesMagnetism in coordination complexesFerrocene Chemistry and Applications
Benjamin Yu Zhi. Wong2012-01-01DR-NTU (Nanyang Technological University)
Magnesium (Mg) and its alloys are widely used as structural material in many industries because of its low density (and lightweight properties), good machinability and high specific strength as well as recyclability. Even though magnesium alloys are popularly produced into cast parts or wrought products, some form of…
Magnesium Alloys: Properties and ApplicationsAluminum Alloy Microstructure PropertiesAluminum Alloys Composites Properties
杨波、李新海、郭华军 等 6 位作者2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
以聚偏氟乙烯-六氟丙烯(PVDF-HFP)和聚乙烯基吡咯烷酮(PVP)为基质材料,采用倒相法,在不同的PVP:PVDF-HFP配比下合成PVP/PVDF-HFP微孔聚合物电解质膜,将制备的微孔膜浸入电解液中活化得到了一系列锂离子电解质膜,并通过扫描电镜、力学、红外光谱进行能分析。研究结果表明:所制备的微孔聚合物电解质膜在PVP:PVDF-HFP配比(质量比)为0.2:1时综合性能最好,其吸液率为210%,抗拉强度为2.86 N/mm2,电导率为1.82×10-3 S/cm,电化学稳定窗口为5.7 V。
Conducting polymers and applicationsDielectric materials and actuatorsAdvanced battery technologies research
Quek, Davin Chin Kuan.2012-01-01DR-NTU (Nanyang Technological University)
The interaction between calcium alginate and SuperParaMagnetic Iron Oxide Nanoparticle (SPION) were investigated. The microcapsules properties were studied through pH dependent degradation, mechanical compression, Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX), X-ray Diffractometer (XRD…
Nanoparticle-Based Drug DeliveryDrug Solubulity and Delivery SystemsAdvanced Drug Delivery Systems
赵福伟、唐贵德2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
利用溶胶-凝胶法(sol-gel)制备了多晶类钙钛矿型稀土锰氧化物La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30)。发现K+取代部分Sr2+后,可使样品的居里温度降至室温附近,并且使样品的室温磁电阻比替代前明显增大。在1.8T的磁场下,x=0.30的样品磁电阻峰值为21%,相应的峰值温度为304K。而母体La0.60Sr0.40MnO3的磁电阻峰值仅为6.4%,峰值温度为373K。可见K+离子替代使室温附近样品的庞磁电阻效应有了明显的改善。
Supercapacitor Materials and FabricationMagnetic and transport properties of perovskites and related materialsMultiferroics and related materials
Vinícius F. Castro、Álvaro A. A. Queiroz2012-01-01Revista Brasileira de Física Médica
Esse trabalho aborda a sintese bioinspirada de ferritas do tipo YFeAl encapsuladas em dendrimeros de poliglicerol (PGLD) de geracao 3. A estrutura e as propriedades morfologicas do sistema YFeAl/PGLD foi caracterizado por difracao de raios-X (DRX) e microscopia eletronica de transmissao (MET). As propriedades magnetic…
Chemistry Education and ResearchDendrimers and Hyperbranched Polymersbiodegradable polymer synthesis and properties
Shang Shang、Xue、Wang 等 12 位作者2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
The effects of different electromagnetic stirring currents on the microstructures of Cu-6%Ag alloys by applying electromagnetic stirring during solidification process are investigated experimentally.The results show that with increasing stirring current,the macro-microstructural grains of the Cu-Ag alloys are refined…
Aluminum Alloy Microstructure PropertiesSolidification and crystal growth phenomenaMetallurgy and Material Forming
Yang Li、Weiluo Zhang、ZJ Xu 等 6 位作者2012-01-01OpenAlex
The channeling phenomenon of carbon ions in single-wall carbon nanotubes (SWCNTs) is investigated by using the molecular dynamics simulation with analytical potentials. The relationship between the channeling critical angles in the SWCNT and the bonding interaction is analyzed. It was found that, at 200-5000 eV and 10…
Ion-surface interactions and analysisCarbon Nanotubes in CompositesAdvanced Energy Technologies and Civil Engineering Innovations
黄薇、Feng Wang、唐波2012-01-01理化检验:化学分册
研究了稀土元素铕(Ⅲ)与胭脂红酸反应体系的共振光散射特性,在磷酸氢二钠-柠檬酸缓冲溶液(pH7.50)中,铕(Ⅲ)的加入使胭脂红酸的共振光散射(RLS)明显增强,在最大散射峰303nm处,RLS信号增强值△I(I-I0)与铕(Ⅲ)浓度在1.00×10^-9~1.00×10^-4 mol·L^-1范围内呈线性。方法的检出限(35/N)为2.52×10^-10 mol·L^-1。
Lanthanide and Transition Metal ComplexesPhytochemical and Pharmacological StudiesProtein Interaction Studies and Fluorescence Analysis
夏光明、孙国新、杨金红 等 6 位作者2012-01-01无机化学学报
本文合成了4种新型不对称酰胺荚醚萃取剂:N,N′-二甲基-N,N′-二苯基-3-氧戊二酰胺(DMDPhDGA)、N′,N′-二甲基-N′,N′-二己基-3-氧戊二酰胺(DMDHDGA)、N,N′-二甲基-N,N′-二辛基-3-氧戊二酰胺(DMDODGA)、N,N′-二甲基-N,N′-二癸基-3-氧戊二酰胺(DMDDDGA)。以氯仿为稀释剂,研究了N,N,N′,N′-四丁基-3-氧戊二酰胺(TBDGA)及上述4种萃取剂从硝酸体系中萃取Gd(Ⅲ)的反应机理,得出萃取能力顺序为:DMDHDGA〉DMDDDGA〉DMDODGA〉DMDPhDGA〉TBDGA。考察了水相酸度和萃取剂浓度对萃取分配比的影响,得出萃合物中有3个萃取剂分子同时参与…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and Reactions
许世彬、王煊、黄崇品 等 4 位作者2012-01-01化工新型材料
以工业ZSM-5分子筛作为硅源,采用水热法制备ZSM-5/Y复合结构分子筛,并对其进行了X射线衍射(XRD)、N2吸附(BET)、核磁共振(NMR)和扫描电镜(SEM)表征。结果表明,产物同时具有ZSM-5分子筛和Y型分子筛的晶相结构特征。晶种的加入能有效地提高晶化反应进程。NaOH溶液的碱性越高,对ZSM-5的溶解性越高。随着晶化时间的延长,属于ZSM-5分子筛的特征峰强度降低、Y分子筛的特征峰强度升高。在晶化时间为10、20和30h时,对体系中加入铝源和晶种进行了研究。结果发现,复合结构分子筛的合成过程伴随着分子筛上骨架硅解离、部分骨架铝解离、硅源和铝源在分子筛骨架外及骨架上晶化形成新的晶体的过程。推断ZSM-5/Y复合结构分…
Advanced ceramic materials synthesisZeolite Catalysis and SynthesisSilicon Effects in Agriculture
冯科、佟振合、吴骊珠 等 7 位作者2012-01-01科学通报
设计合成了紫精(MV2+)桥连4′-(4-甲基-苯基)-2,2′:6′,2′′-三联吡啶铂(Ⅱ)(4-CH3-PhN^N^NPtCl)的双核配合物1,{[MV2+(4-CH2PhN^N^NPtCl)22+]·4PF6–}.利用紫外可见吸收光谱、发光光谱、电化学循环伏安谱以及瞬态吸收光谱研究了体系的光诱导电子转移过程,发现在乙腈/甲醇混合溶剂中该二元体系光诱导电子转移的速率常数kCS大于1.4×108s–1,电子回传的速率常数kCR大于2.1×103s–1,电荷分离态寿命长达479μs.
Organic and Molecular Conductors ResearchMagnetism in coordination complexesOrganic Light-Emitting Diodes Research
郁有祝、郭玉华、候红敏2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
利用分光光度法研究了槲皮素与Co(Ⅱ)形成配合物的最佳反应条件,测定了其配比和条件稳定常数。结果表明,在pH 4.7 HAc-NH_4Ac缓冲溶液中.槲皮素与Co(Ⅱ)配位,该配合物在584nm处有最大吸收。Co~(2+)的浓度在2.0×10~(-5)—1.1×10~(-4)mol/L之间与吸光度呈线性关系。采用等摩尔连续变化法测得槲皮素-Co(Ⅱ)配合物的配位比为2:1,计算得到该配合物的条件稳定常数为2.7×10~7L~2·mol~(-2)。
Surfactants and Colloidal SystemsChemical and Physical Properties in Aqueous SolutionsGold and Silver Nanoparticles Synthesis and Applications
Jiaxin. Wang2012-01-01DR-NTU (Nanyang Technological University)
Syntactic foam is a binary composite consist of hollow particles and a matrix. Due to its good mechanical properties, it is widely applied in aerospace and marine industries. However, among the past studies, there is a significant lack of research to investigate its functional property such as its electromagnetic inte…
Fiber-reinforced polymer compositesElectromagnetic wave absorption materialsCellular and Composite Structures
王明华、王凤栾、黎潮 等 4 位作者2012-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
采用水热法合成Cu-Zn-Al-Fe催化剂,使用HZSM-5作载体,考察了硝酸盐溶液浓度、老化温度、Fe含量对催化剂的影响.对制备的催化剂进行了SEM,BET,FT-IR和XRD检测.在4MPa,260℃,H2和coz体积分数比为3的条件下,由二氧化碳加氢直接合成二甲醚(DME).结果表明:硝酸盐质量分数为10%,老化温度为150℃时制备的催化剂粒径最小,约500nm,比表面积达200.6m2/g.在Fe的质量分数为5%时c02的转化率达41.4%,DME的选择性达45.2%.
Layered Double Hydroxides Synthesis and ApplicationsIndustrial Gas Emission ControlCatalysis and Hydrodesulfurization Studies
江光奇2012-01-01分子科学学报:中英文版
通过使用四臂八齿Schiff配体(H4L)与六水合硝酸钴反应,成功合成了Co(Ⅱ)席夫碱配合物C26H26N3O3Co.3H2O,并使用元素分析、IR光谱及单晶X射线衍射等方法对配合物进行了表征.结构分析表明,配合物中的配体通过3个分枝上的N和O原子与金属离子配位,形成扭曲的八面体几何构型,配体上未参与配位的分枝发生了水解,氨基发生了质子化,且配合物通过分子间氢键的弱相互作用沿晶体学a轴方向排列成1D链状结构.
Porphyrin and Phthalocyanine ChemistrySupramolecular Chemistry and ComplexesMetal-Organic Frameworks: Synthesis and Applications