三氧化二铝-聚苯乙烯复合微球的制备

以Al2O3-PS复合材料为原料,采用乳液微封装法制备出掺杂Al2O3的PS空心微球。三相溶液分别是两个水相：蒸馏水（W1相）、5wt%PVA水溶液（W2相）和3wt%Al2O3-PS溶液（O相,苯和三氯甲烷混合物作溶剂）。所得微球表面粗糙度低于50nm。     

液晶分子印迹整体柱的制备及其分子识别热力学

液晶分子印迹聚合物(MIPs)因刚性液晶单体的加入而在超低交联度水平下也能印迹和识别模板分子,有效解决了传统MIPs因高交联度造成的位点包埋、结合容量低、传质慢等问题.尽管液晶MIPs具有如此独特的优势,但却面临着由于交联度的大幅度降低而导致印迹效果下降的问题.为了研究液晶MIPs的结合特性,制备具有良好印迹效果的低交...     

柱几何Rayleigh-Taylor不稳定性的数值模拟

给出了柱几何中流体力学方程组及其在数值模拟中采用的计算方法。对二维柱几何Rayleigh-Taylor不稳定性进行数值模拟,在线性阶段与线性理论符合得很好;不稳定性增长进入非线性区域的阈值依赖于界面的位置,并且明显不同于平面情况。     

Solid-Phase Synthesis of 2-Arylamino-5-(4-hydroxyphenyl)-1,3,4-thiadiazole Derivatives Based on Resin-Bound Acylhydrazines

A highly efficient, solid-phase synthesis of 2-arylamino-5-(4-hydroxy-phenyl)-1,3,4-thiadiazole derivatives under mild conditions has been developed. The 1,3,4-thiadiazole derivatives were synthesized from resin-bound acylhydrazines in several steps, which gave 78–88% overall yields and excellent purities of the products.     

Solvent‐Free Aerobic Chemoselective Oxidation of β‐Ionone catalyzed by N‐Hydroxyphthalimide/Co(acac)2

β‐Ionone was oxidized with O₂ under solvent‐free conditions catalyzed by an N‐hydroxyphthalimide/Co(acac)₂ system in mild conditions with high conversion and excellent selectivity to oxo‐β‐ionone or 5,6‐epoxy‐β‐ionone in different reaction conditions, respectively.     

Photocatalysis: an overview of recent developments and technological advancements

Photocatalysis,which is the catalyzation of redox reactions via the use of energy obtained from light sources,is a topic that has garnered a lot of attention in recent years as a means of addressing the environmental and economic issues plaguing society today.Of particular interest are photosynthesis can potentially mimic a variety of vital reactions,many of which hold the key to develop sustainable energy economy.In light of this,many of the technological and procedural advancements that have recently occurred in the field are discussed in this review,namely those linked to:(1)photocatalysts made from metal oxides,nitride,and sulfides;(2)photocatalysis via polymeric carbon nitride(PCN);and(3)general advances and mechanistic insights related to TiO2-based catalysts.The challenges and opportunities that have arisen over the past few years are discussed in detail.Basic concepts and experimental procedures which could be useful for eventually overcoming the problems associated with photocatalysis are presented herein.     

催化裂解-金汞齐富集-冷原子吸收光谱仪测定土壤样品中总汞含量

为避免汞消解过程中产生的蒸发损失及前处理过程中产生器具与样品污染,通过配制汞总量为0～2、0～15和25～1 023 ng的三种不同汞浓度系列的标准工作曲线,选取9个土壤样品、3种国家土壤有证标准物质,同一样品分别进行6组平行测定,并抽取3个土壤样品进行3种不同浓度加标回收实验,以对其方法精密度和准确度进行论证,建立了催化裂解-金汞齐富集-冷原子吸收光谱法即直接测汞仪测定土壤样品中汞含量的方法。结果显示,仪器信号值与Hg总量之间均呈良好的线性关系。根据仪器多次测定空白数据结果,按照称样量0.1 g计算,方法检出为0.09 ng/g;平行测定结果相对标准偏差均小于10%,土壤标准物质测定值与参考值均相符,不同浓度的加标回收率范围为69.0%～97.0%。方法可用于批量土壤样品中汞含量的快速测定,精密度和准确度可满足测定要求,且实验过程中无需前处理消解,操作方便、快速高效。     

偶氮型光致变色液晶树状大分子的量子产率、异构转化率和活化能研究

研究了化合物端基含36个己氧基偶氮苯介晶基元的二代(G2)光致变色液晶树状大分子在氯仿及四氢呋喃溶液中的量子产率、吸收光强Ia、活化能E、异构转化率A/A0、热回复异构化速率常数kH及其反/顺异构体组分比A′/A′0,并与一代光致变色液晶碳硅烷树状大分子(G1)及介晶基元化合物(M3)的光化学行为进行了比较.在氯仿及四氢呋喃溶液中的量子产率的顺序均为M3>G1>G2,吸收光强Ia在氯仿及四氢呋喃溶液中的顺序分别为G2>G1>M3(氯仿)和M3>G1>G2(四氢呋喃),在氯仿及四氢呋喃溶液中活化能的顺序均为M3>G2>G1,在氯仿及四氢呋喃溶液中热回复异构化速率常数kH的顺序均为G1>G2>M3,在热回复异构化反应中的反/顺异构体组分比A′/A0′在氯仿及四氢呋喃溶液中的顺序均为G2>G1>M3.     

冲积平原区土壤中重金属元素的存在形态分析

采用0.1mol／L氢氧化钠浸提腐殖酸的方法,将土壤中的腐殖酸及与腐殖酸结合的重金属元素分离出来;分别用分光光度法、原子荧光光谱法、等离子质谱法测定样品中腐殖酸及重金属元素的含量;初步测定结果显示：与腐殖酸结合的重金属元素是冲积平原区表层土壤中重金属元素的1种重要存在形态,而且可能是土壤中重金属污染元素主要的存在形式。     

过氧化氢氧化酸性品红催化光度法测定痕量铬(Ⅵ)

基于在弱酸介质中,铬(Ⅵ)催化过氧化氢氧化酸性品红的反应,建立了动力学分光光度法测定痕量铬(Ⅵ)的新方法。本法的检出限为5.7×10~(-9)g/ml,线性范围为0～160ng/ml。可用于电镀废水和电镀排放水中铬(Ⅵ)的测定。