Resonance Raman Study of Aggregated Meso-tetra(4-pyridinium) porphyrin Diacid

研究了近激子吸收带激发下四-(4-吡啶基)卟啉二酸(H₈TPyP⁶⁺)聚集体的共振拉曼光谱．测量了H₈TPyP⁶⁺单体和聚集体的紫外可见吸收谱和共振光散射光谱．在氘代位移的基础上结合相关体系振动光谱研究,对测得的H₈TPyP⁶⁺)单体和聚集体的拉曼谱带进行了指认．聚集体的形成导致H₈TPyP⁶⁺的卟啉环CC/CN面内伸缩振动向低波数方向位移2～6 cm^-1,而卟啉环鞍形面外振动带向高波数方向位移12cm^-1．基于拉曼谱带的强度和频率变化分析了聚集引起的H₈TPyP⁶⁺分子内结构变化和分子间氢键作用     

基于散射实验极化靶的2.5T/1.3K的动态核极化(DNP)系统的开发

动态核极化法(Dynamic Nuclear Polarization, DNP)是利用热平衡下的电子在磁场中的高自旋极化率转移到原子核自旋的技术,从而极大的提高原子核自旋极化率。多种动态极化靶材料已广泛的用于自旋物理散射实验。本文介绍一种简单实用,共同开发的日本山形大学DNP系统,包括超导磁场,氦4蒸发恒冷器,微波系统以及NMR核磁共振检测系统,测得中子靶材料氘带丁醇(D-butanol)中氘核的极化率在2.5T/1.3K达到+6.5%。     

达旦黄-曲通X-100体系共振光散射法测定蛋白质

基于在Triton X-100存在下,蛋白质与达旦黄作用使得体系的共振光散射增强,在λ＝492 nm处光散射强度最大,增强作用的强弱与蛋白质的含量成正比,据此建立了共振光散射测定蛋白质的新方法。此方法对牛血清白蛋白的检出限达到17.7 ng·mL-1,线性范围为0.03～0.9 μg·mL-1,用于合成样与人血清样品的分析,取得了令人满意的结果。同时也研究了人血清白蛋白、鸡蛋白蛋白、溶菌酶、胰蛋白酶与达旦黄的作用。     

稀土Tonpilz换能器的有限元设计法

当Tonpilz换能器组件迥横截面面积之间相差较大时,应力,应变会有一定的突破,边界条件将不很连续,用四端网络方法设计会带来较大的误差,本文用有限元方法,设计并研制了一稀土Tonpilz型换能器 实验测试表明,与四端网络设计法相比,有限元方法具有更好的设计精度。     

甲苯胺蓝共振光散射法测定纳克级脱氧核糖核酸

研究了吩噻嗪类染料甲苯胺蓝 (TB)与DNA作用的共振光散射光谱 ,在pH 1 0～ 1 1的范围内 ,加入DNA导致甲苯胺蓝共振光散射增强 ,在 35 0nm处 ,存在一共振光散射增强峰 ,其强度与DNA浓度呈线性关系 ,据此建立了一种测定DNA的共振光散射法。对于ctDNA ,方法的线性范围为 0～ 90 0ng·mL-1 ,检出限为6 75ng·mL-1 ,RSD为 3 7% ;对于fsDNA ,方法的线性范围为 0～ 90 0ng·mL-1 ,检出限为 2 99ng·mL-1 ,RSD为 5 6 % .已用于合成样品中DNA的测定     

含咔唑与偶氮分散红共聚物的表面增强共振拉曼光谱研究

借助于表面增强共振拉曼光谱散射(SERRS)技术,研究了一种新型的偶氮聚合物材料侧链含咔唑与偶氮分散红共聚物(CAP)在化学沉积法制备的银膜表面的拉曼峰增强和吸附行为。实验结果显示,CAP在银表面的状态为: 聚合物通过咔唑单体中咔唑基团和偶氮单体中硝基与银膜衬底发生物理吸附,而聚合物的主链与衬底相距较远没有相互作用。可以推测,聚合物在衬底表面的这种状态将对偶氮光存储器件的稳定性和工作效率产生不良影响。     

Isolation and Characterization of Badge Hydrolysis Products

Heating a suspension of Bisphenol A diglycidyl ether (BADGE) in 20 : 80 tetrahydrofuran/water at 70°C and subsequent passage of the resulting solution through C18 columns allowed isolation and purification to > 97% of each of the two hydrolysis products 2-[4-(2,3-dihydroxypropoxy) phenyl]-2-[4-(2,3-epoxypropoxy)phenyl]propane (1HP) and 2,2-bis[4-(2,3-dihydroxypropoxy)phenyl] propane (2HP), which were characterized by UV, IR, ₁H and _I3C NMR spectroscopy and mass spectrometry.     

Studies on the electro-optical and the light-scattering properties of PDLC films with the size gradient of the LC droplets

Polymer dispersed liquid crystal (PDLC) films with the size gradient of the LC droplets were prepared based on the epoxy/acrylate hybrid polymer matrix. The ultraviolet (UV) intensity gradient was induced by the UV-absorbing dye over the thickness of the samples. Taking advantage of the difference between the epoxy monomers and acrylate monomers in polymerisation rates and the UV intensity gradient, the gradient distribution of the LC droplet size was formed in PDLC films. The effect of the size gradient of the LC droplets on the electro-optical and the light-scattering properties of PDLC films was investigated. The results showed that due to the size gradient distribution of the LC droplets, PDLC films could exhibit the strong light scattering in the UV-visible-near infrared (VIS-NIR) region. Consequently, it provides a potential approach for modulating NIR light transmittance.     

Extraordinary acoustic transmission,symmetry, blaschke products and resonators

The phenomenon of extraordinary acoustic transmission ( eat) in a resonator, which has recently been investigated experimentally, is studied theoretically. It is shown that the combination of a single propagating mode and a symmetry orthogonal to the direction of propagation for a resonator leads to eat. This is accomplished by decomposing the problem using symmetry, the Blaschke product and the properties of functions of a single complex variable which have modulus one on the real axis. The conditions of a resonator requires that the solution has singularities in the analytic extension to complex frequencies (resonances) and it is precisely near these resonances that we observe eat. The condition of a Blaschke product requires that there is a zero at the complex conjugate of the singularity and eat occurs when the solution on the real axis passes between these complex conjugate pairs of poles and zeros. A detailed numerical study of the problem is conducted and we show that once the single mode of propagation or the symmetry is broken then eat (at least perfect transmission) no longer holds generally.