Hydration-Facilitated Fine-Tuning of the AIE Amphiphile Color and Application as Erasable Materials with Hot/Cold Dual Writing Modes

Hydration water greatly impacts the color of inorganic crystals, but it is still unknown whether hydration water can be utilized to systematically manipulate the emission color of organic luminescent groups. Now, metal ions with different hydration ability allow fine-tuning the emission color of a fluorescent group displaying aggregation induced emission (AIE). Because the hydration water can be removed easily by gentle heating or mechanical grinding and re-gained by solvent fuming, rewritable materials can be fabricated both in the hot-writing and cold-writing modes. This hydration-facilitated strategy will open up a new vista in fine-tuning the emission color of AIE molecules based on one synthesis and in the design of smart luminescent devices.     

Microstructure, bonding strength and thermal shock resistance of ceramic coatings on steels prepared by plasma electrolytic oxidation

Ceramic coatings were successfully prepared on steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte and silicate electrolyte, respectively. The microstructure of the coatings including surface morphology, phase and element composition were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The bonding strength between the ceramic coating and the substrate was tested using different methods including tensile tests and shearing tests. The thermal shock resistance of the coatings was also evaluated. The results indicated that coatings obtained in both electrolytes were porous and coarse. The average diameters of the pores were below 10 μm. PEO coatings obtained in aluminate electrolyte were composed of Fe₃O₄ and FeAl₂O₄, while those obtained in silicate electrolyte were in a noncrystal state. PEO coatings obtained in aluminate electrolyte showed similar change trend of tensile strength and shearing strength with increasing treating time, namely, a relatively high values with middle time treating and low value with short and long time treating. The best coating was the samples treated with 30 min, whose tensile strength was 20.6 MPa and shearing strength was 16 MPa. The tensile strength and shearing strength of coatings obtained in silicate electrolyte were not strongly influenced by the treating time, the values of which were range in 14 ± 2 MPa and 11 ± 2 MPa, respectively. Coatings obtained in both electrolytes showed the best thermal shock resistance with middle time treating. Coatings obtained in silicate electrolyte show a little better thermal shock resistance than those obtained in aluminate electrolyte.     

Left-right asymmetry for meson production in SIDIS proces

We analyze the left-right asymmetry in the semi-inclusive deep inelastic scattering （SIDIS） process using a method where no weighting function are used. Considering all flavor of quarks, we reanalyze the π±production and extend our calculation on the K± production. The predictions on HERMES, COMPASS and JLab kinematics with transversely polarized nucleon target are shown in this paper.     

秋千--力学模型,初等分析与参数共振微扰解析解

采用可变长度单摆的力学模型对秋千振荡给出初等分析,采用微扰近似法导出了秋千的非线性参数共振解析解,并进行了讨论。     

光致变色材料多阶光存储模型与实验

光致变色材料具有光子型反应的特点,控制光致变色材料吸收的光子数就可以控制材料的反应程度,从而实现多阶存储。根据光化学反应的原理,分析了光致变色材料的写入过程,建立了光致变色多阶存储写入过程的反射率模型。根据该模型的仿真计算结果,设定了一组合适的曝光量,在1,2_双(2_甲基_5_(4_(1,3_二氧戊环基)苯基)噻吩_3_基)全氟环戊烯材料上实现了8阶存储。     

邻菲咯啉-过氧化氢-铬黑T反应体系的光谱研究及其应用

在稀醋酸介质中,痕量邻菲咯啉对过氧化氢氧化铬黑T的褪色反应有明显的阻抑作用,据此建立了阻抑动力学光度法灵敏测定痕量邻菲咯啉的新方法,并讨论了该方法的动力学参数。在最佳实验条件下,其线性范围为0.003～0.08mg·L-1;检出限为4.0μg·L-1。该方法灵敏、快速、操作简便,用于水样中邻菲咯啉含量的测定,结果令人满意。     

β-二酮型高分子纳米微球与核酸相互作用的共振光散射光谱及分析应用

在超声辐射下 ,过氧化氢氧化降解聚乙烯醇 (PVA) ,制得与 Zn2 形成配位体的纳米尺寸的 β-二酮型高分子微球 (Zn- PVK)。对 Zn- PVK的共振光散射 (RLS)性质研究发现 ,Zn- PVK与核酸形成缔合物时将导致 Zn- PVK的 RLS信号急剧增加 ,据此建立一种用 RLS信号测定痕量核酸的新方法。方法的抗干扰能力强 ,用于合成样品的分析 ,结果令人满意。     

用雅可比-傅里叶矩进行图像描述

提出了雅可比—傅里叶矩,它是用雅可比多项式作为径向函数,用傅里叶因子作为角向函数构造而成的,是广义正交傅里叶—梅林矩。经过归一化处理后的雅克比—傅立叶矩具有平移、尺度、旋转、灰度多畸不变性。从归一化图像重建误差、噪声灵敏度等方面对雅可比—傅里叶矩的图像描述能力进行了研究,结果显示雅可比—傅里叶矩在各种参量选择的情况下,具有良好的图像描述和抗噪声能力,是一个优良的图像特征。以前的研究多为单纯构建某一个函数,而现在将其扩展为构建一个函数族,开阔了矩描述量的研究视野。     

三类南海海洋真菌次级代谢产物的合成研究进展

综述了三类南海海洋真菌次级代谢产物, 即Xyloketal化合物、1893A和天然4H-5,6-二氢-1,2-噁嗪类化合物的合成研究进展.     

Asymmetrical Fluorene[2,3‐b]benzo[d]thiophene Derivatives: Synthesis,Solid‐State Structures,and Application in Solution‐Processable Organic Light‐Emitting Diodes

A series of novel asymmetrical fused compounds containing the backbone of fluorene[2,3‐b]benzo[d]thiophene (FBT) were effectively synthesized and fully characterized. Single‐crystal X‐ray studies demonstrated that the length of the substituent side chains greatly affects the solid‐state packing of the obtained fused compounds. DFT, photophysical, and electrochemical studies all showed that the FBTs have large band gaps, low‐lying HOMO energy levels, and therefore good stability toward oxidation. Moreover, the substituents strongly influence the fluorescence properties of the resulting FBT derivatives. The di‐n‐hexyl compound exhibits intense fluorescence in solution with the highest quantum yield of up to 91 %. Solution‐processed green phosphorescent organic light‐emitting diodes with the di‐n‐butyl derivative as the host material exhibited a maximum brightness of 14 185 cd m^?2 and a luminescence efficiency of 12 cd A^?1.