A Substitution‐Dependent Light‐Up Fluorescence Probe for Selectively Detecting Fe3+ Ions and Its Cell Imaging Application

Deliberate design of specific and sensitive molecular probes with distinctive physical/chemical properties for analyte sensing is of great significance. Herein, by taking advantage of the position‐dependent substituent effects, an aggregation‐induced emission featured iron (III) probe from ortho‐substituted pyridinyl‐functionalized tetraphenylethylene (TPE‐o‐Py) is synthesized. It displays high sensitivity and selectivity toward iron (III) detection. The recognition arises from the position isomer of ortho‐substitution, and the fact that TPE‐o‐Py has a low acid dissociation constant (pK _a) that is close to that of hydrolyzed Fe³⁺. Importantly, TPE‐o‐Py as a light‐up fluorescence probe could be employed for Fe³⁺ sensing in living cells with a pronounced red‐shift in fluorescence emission.     

减少硅片湿法清洗工艺铁离子沾污研究

为了研制出高性能电荷耦合器件（CCD）,减少硅片清洗工艺Fe离子沾污是关键。利用表面光电压（SPV）法,研究了硅片清洗过程的Fe离子沾污。研究表明,SPM（H2SO4/H2O2）→SC-1清洗,去除Fe离子污染的效果比较差;用SPM→SC-1→SC-2清洗,去除Fe离子杂质的效果较好,Fe离子污染减少了2个数量级。增加SC-1和SC-2清洗次数可以减少Fe离子沾污,但效果不明显。当化学试剂中金属杂质含量由1×10^-8 cm^-3减少到1×10^-9 cm^-3,清洗工艺Fe离子沾污减少到8.0×1010 cm^-3。     

工频电场对ADSS光缆特性的影响

随着电压等级的不断提高,超高压输电线路发展非常迅速.但是这些架空输电线路在运行时,附近存在较高的电场,对周围物体和公用走廊的其它线路会产生影响.电压等级越高,产生的电场影响越大.输电线路产生的电场越来越受到人们的重视.尤其是对于超高压输电线路,由于在电力铁塔上同塔悬挂全介质自承式光缆(ADSS),因此分析工频电场对ADSS光缆特性的影响非常必要.     

钕铁硼取向成型压机的自动化改造

我国是钕铁硼资源和生产的大国,但是生产设备相对比较落后,尤其是压型环节自动化和信息化程度很低。国际上有全自动压机,但是自动化的程度没有本项目全面,且价格昂贵,而且不太适合国内的生产工艺和生产状况。因此,从降低人工劳动强度、减员增效、促进企业安全生产、节能降耗、提升产品质量以及提升企业效率、管理和信息化水平的角度看,钕铁硼取向成型压机的自动化改造势在必行。     

微波加热含碳铁矿粉还原矿相结构研究

微波加热含碳铁矿粉还原矿相结构分为金属铁、浮氏体和渣相结构。矿粉颗粒围绕煤粉颗粒进行还原，形成星点状金属铁，进而形成环带状结构。由于矿-煤颗粒界面间还原出的金属铁厚度增大，使初始直接还原反应减弱，尚未还原的FeO核心依靠碳气化生成的CO和金属铁中碳的扩散继续还原，形成蠕虫状金属铁连晶结构。浮氏体对微波具有一定的吸收性，在微波场中自身热碎裂，可加速碳热还原。渣相含有变价铁元素，对微波有一定的吸收能力，有利于渣相中复杂铁氧化物的还原。     

激光冲击对球墨铸铁表面性能的影响

应用人工神经网络理论,合理选择激光冲击参数,对球墨铸铁QT450-10进行了激光冲击试验,并用扫描电镜和数显硬度仪等进行了分析。结果表明激光冲击使球墨铸铁的表面性能得到明显改善,冲击区表面的平均硬度随冲击次数(1～4)的增加分别增加了34.56％～53.02％,硬化层深约为0.31mm～l47mm。     

Bioinspired Magnetite Crystallization Directed by Random Copolypeptides

Control over magnetite (Fe₃O₄) formation is difficult to achieve in synthetic systems without using non‐aqueous media and high temperatures. In contrast, Nature employs often intrinsically disordered proteins to tightly tailor the size, shape, purity, and organization of the nanocrystals to optimize their magnetic properties. Inspired by such “flexible polyelectrolytes,” here random copolypeptides having different amino acid compositions are used as control agents in the bioinspired coprecipitation of magnetite through a ferrihydrite precursor, following a recently developed mineralization protocol. Importantly, the copolypeptide library is designed such that the amino acid composition can be optimized to simultaneously direct the size of the nanoparticles as well as their dispersibility in aqueous media in a one‐pot manner. Acidic amino acids are demonstrated to regulate the crystal size by delaying nucleation and reducing growth. Their relative content thus can be balanced to tune between the superparamagnetic and ferrimagnetic regimes, and high contents of negatively charged amino acids result in colloidal stabilization of superparamagnetic nanoparticles at high pH. Conversely, with positively charged lysine‐rich copolypeptides ferrimagnetic crystals are obtained which are stabilized at neutral pH and self‐organize in chains, as visualized by cryo‐transmission electron microscopy. Altogether, the presented findings give important insights for the future development of additive‐mediated nanomaterial syntheses.     

Fabrication of Fischer–Tropsch Catalysts by Deposition of Iron Nanocrystals on Carbon Nanotubes

The fabrication of supported catalysts consisting of colloidal iron oxide nanocrystals with tunable size, geometry, and loading—homogeneously dispersed on carbon nanotube (CNT) supports—is described herein. The catalyst synthesis is performed in a two‐step approach. First, colloidal iron and iron oxide nanocrystals with a narrow size distribution are produced. Second, the nanocrystals are attached to CNT grains serving as support structure. Important features, like iron loading and nanocrystal density on the CNT support, are controlled by changing the nanocrystal concentration and ligand concentration, respectively. The Fischer–Tropsch performance reveals these new materials to be active, selective toward lower olefins (60% C of hydrocarbons produced in the absence of promoters), and remarkably stable against particle growth.     

Dual‐Salt Mg‐Based Batteries with Conversion Cathodes

Mg batteries as the most typical multivalent batteries are attracting increasing attention because of resource abundance, high volumetric energy density, and smooth plating/stripping of Mg anodes. However, current limitations for the progress of Mg batteries come from the lack of high voltage electrolytes and fast Mg‐insertable structure prototypes. In order to improve their energy or power density, hybrid systems combining Li‐driven cathode reaction with Mg anode process appear to be a potential solution by bypassing the aforementioned limitations. Here, FeS _x (x = 1 or 2) is employed as conversion cathode with 2–4 electron transfers to achieve a maximum energy density close to 400 Wh kg^?1, which is comparable with that of Li‐ion batteries but without serious dendrite growth and polysulphide dissolution. In situ formation of solid electrolyte interfaces on both sulfide and Mg electrodes is likely responsible for long‐life cycling and suppression of S‐species passivation at Mg anodes. Without any decoration on the cathode, electrolyte additive, or anode protection, a reversible capacity of more than 200 mAh g^?1 is still preserved for Mg/FeS₂ after 200 cycles.     

Iron Distribution in Heated Beef and Chicken Muscles

Distribution of iron in six fractions (water-soluble, water-insoluble, diffusate, hematin, total heme, and ferritin) of beef and chicken muscles hcatcd to 55, 70, 85, and 100°C was determined. Iron content decreased in water-soluble fractions and increased in water-insoluble fractions as temperature increased from 27°C to 100°C. Heme iron decreased more from 55°C to 85°C than from 27°C to 55°C or 85°C to 100°C. The increase in diffusate iron appeared to be less than the decrease in heme iron at each heating temperature. As temperature increased from 27°C to 100°C, hematin iron content increased and extractable ferritin iron content decreased. These findings may help explain rapid development of oxidative rancidity in cooked meat.