卟啉LB膜的分子取向,形貌和膜厚度研究

研究了５，１０，１５，２０－四（对－山嵛酸乙酯－α－氧代苯基）卟啉分子在气液罪肌的成膜性，制备了该化合物的多层ＬＢ膜，研究了分子中不同的基团在ＬＢ膜中的取向，观测了ＬＢ膜的形貌和厚度，利用偏振ＵＶ－Ｖｉｓ和偏振ＦＴ－ＩＲ谱测定了分子内卟啉环和脂链取代基的取向，结果表明卟啉面法线和脂缝线与载片线间的夹角分别为３７°和２７°，利用ＴＥＭ观测了ＬＢ膜的形貌和厚度，结果表明ＬＢ膜表面均匀，单层厚度大约为２     

聚丁二炔Langmuir—Blodgett薄膜的光声谱研究：（Ⅰ）结构表征与光声？…

本在用Ｘ－射线小角衍射聚合与转载先后次序不同的ＰＤＡ ＬＢ膜进行结构表征的基础上,不同厚度的ＰＤＡ ＬＢ膜的光声新斩波频率效应说明,随着ＰＤＡ ＬＢ膜厚度增加,ＬＢ膜的热学性质逐渐明显。此外,还探讨了如何从ＰＤＡ ＬＢ膜的光声谱求得光声吸收系数问题,本的研究结果表明,光声谱技术是研究ＬＢ膜热学特性的有效手段。     

聚丁二炔Langmuir-Blodgett薄膜的光声谱研究(Ⅰ)结构表征与光声吸收系数

本文在用Ｘ－射线小角衍射对聚合与转载先后次序不同的ＰＤＡＬＢ膜进行结构表征的基础上,不同厚度ＰＤＡＬＢ膜的光声斩波频率效应说明,随着ＰＤＡＬＢ膜厚度增加,ＬＢ膜的热学性质逐渐明显。此外,还探讨了如何从ＰＤＡＬＢ膜的光声谱求得光声吸收系数问题,本文的研究结果表明,光声谱技术是研究ＬＢ膜热学特性的有效手段。     

LB膜技术在液晶取向中的应用

本文以ＬＢ膜技术研究了向列相液晶的取向机理。选择了四种不同金属的可溶性酞菁化合物ＭＰｃ－Ｒ４作为取向材料，拉制成ＬＢ膜，诱导向列相正性液晶Ｅ－７。通过对菁酞ＬＢ膜的表征和液晶取向及电光性能的研究，认为液晶的取向是由分子间的相互作用力决定的。     

聚酰亚胺LB膜上液晶表面锚定的研究

通过测试光延迟研究了聚酰亚胺ＬＢ膜的光学各向异性，分析了在ＬＢ膜成膜过程中成膜分子的流动取向特性，并研究了液晶的表面锚定能，分析了ＬＢ膜上液晶的取向机制．聚酰亚胺ＬＢ膜的链段的取向程度较强摩擦情形的聚酰亚胺表面的链段取向要差．强摩擦的聚酰亚胺会比聚酰亚胺ＬＢ膜具有更好的排列液晶分子的能力．ＬＢ膜的流动取向模式使得聚酰亚胺成膜分子沿拉伸方向形成一定的有序排列，并诱导液晶分子定向排列，液晶和聚合物分子相互作用是液晶表面排列的主要动力 关键词：     

聚丁二炔Langmuir-Blodgett薄膜的光声谱研究(Ⅱ) 光谱综合分析和荧光量子效率

本文用光声谱（ｐｈｏｔｏａｃｏｕｓｔｉｃｓｐｅｃｔｒｏｓｃｏｐｙ,ＰＡＳ）结合光吸收谱、荧光光谱等对在工业上有潜在应用前景的聚丁二炔（ｐｏｌｙｄｉａｃｅｔｙｌｅｎｅ,ＰＤＡ）Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔ（ＬＢ）薄膜进行了研究。对经不同气体环境处理的ＰＤＡＬＢ膜的紫外－可见光声谱、光吸收谱和荧光光谱的综合分析表明,ＰＤＡＬＢ膜的激发态弛豫过程中激子和极化子形成的元激发性质。此外,还讨论了ＰＤＡＬＢ膜的荧光量子效率。本文的研究结果表明,用光声谱研究ＬＢ膜,可以获取仅用其他光谱得不到的信息。     

聚酰亚胺LB膜的研究：Ⅰ聚酰胺酸N,N—二甲基十八胺前聚物的LB膜

聚酰胺酸Ｎ，Ｎ－二甲基十八胺是制备本身不具备两亲性的聚酰亚胺ＬＢ膜的前聚物。合成制备了均苯四酸二酐－４，４’－二胺基二苯酸Ｎ，Ｎ－二甲基十八胺，研究了它单分子膜的各异性，比较了伯胺和叔胺膜的不同，并用低角Ｘ射线衍射研究这前聚物ＬＢ膜分子的详细排列。     

电子束在LB抗蚀层及衬底中散射轨迹的Monte—Carlo模拟

研究了高能电子束在ＬＢ膜及多层膜中的输运特性，用Ｍｏｎｔｅ－Ｃａｒｌｏ技术模拟电子在ＬＢ聚甲基丙燃酸甲酯抗蚀层及蒸镀有铬膜的硅衬中的散射轨迹，并讨论了电子束曝光刻蚀应用ＬＢ膜作抗蚀层的优越性。     

LB膜混合聚集体中极性基团相互作用对光学非线性的影响

通过紫外－可见吸收光谱、压力－面积等温线、二次谐波的测量，研究了不同活性分子混合聚集体的形成对ＬＢ膜光学性质的影响。分子极性基团间的相互作用，使激发态能量及平均偶极矩发生变化，导致ＬＢ膜的光学非线性明显地增强或减弱。     

5,10,15,20-四-(4-十六烷基吡啶基)卟啉LB膜结构的研究

研究了两亲性卟啉５,１０,１５,２０－四－（４－十六烷基吡啶基）卟啉溴化物在气－液界面上的成膜性能,制备了其ＬＢ膜。用扫描隧道显微镜和ＵＶ－Ｖｉｓ光谱,荧光光谱,小角Ｘ射线衍射等实验方法研究了ＬＢ膜的形貌和卟啉大环分子在ＬＢ膜中的排列、取向和分子间的相互作用。结果表明,制备的ＬＢ膜结构均匀,性能稳定,在ＬＢ膜内,脂肪链并不是直立的,卟啉分子大环几乎平躺在基片上。     

小牛胸腺DNA分子Langmuir-Blodgett复合膜的表面增强拉曼光谱研究

本文利用Langmuir-Blodgett(LB)技术将小牛胸腺DNA分子沉积在银基底上,测试并讨论了它的π-A等温曲线,原子力图及表面增强拉曼光谱(SERS)。通过利用LB技术,获得了DNA分子的LB复合膜的高质量的SERS。在DNA分子LB膜的表面增强拉曼光谱中,DNA的核糖和碱基腺嘌呤是吸附活性部位,它们的振动光谱得到增强。DNA的其它碱基和磷酸基团的拉曼光谱强度也明显的得到增强。分析认为DNA分子增强的拉曼光谱主要是由于LB膜的有序结构的贡献,使得SERS效应得到进一步的增强。因此利用LB技术是得到DNA的高质量SERS很好的方法。     

AFM investigation of polymer LB films on the alignment of ferroelectric liquid crystal

A kind of newly synthesized polyimide (PI) LB films were fabricated to align ferroelectric liquid crystal (FLC). The topologies of PI LB films treated by different imidization processes were investigated by atomic force microscopy (AFM). It is found that the imidization temperature influences the crystalline structure of the LB films and high-temperature imidized LB films can provide the energy barrier for the realization of excellent bistability, while the ultra-thinness of LB films is helpful for the quick response of the FLC cell.     

十八胺LB膜吸附组装金纳米颗粒研究

制备了十八胺单层、多层LB膜及粒径为几个纳米的金纳米粒子。pH值小于10.3时十八胺带正电荷,将其置于金纳米溶胶(pH值10.3)中,带负电荷的金纳米粒子与带正电荷的十八胺之间通过静电作用,金纳米颗粒被成功地吸附组装到十八胺LB膜中,形成纳米薄膜。紫外-可见光谱、红外光谱及扫描电镜显示:金纳米颗粒通过这种方法能够很好的组装在十八胺LB膜上,且其组装层整齐有序,同时也受十八胺LB膜层数及组装时间的影响。     

铁电超微粒/硬脂酸LB膜的制备和光谱特性研究

用LB膜技术组装铁电超微粒，实验结果显示：LB膜中的铁电超微粒比较稳定，覆盖度也比较高，并且存在介电限域效应，在室温下具有光致发光现象；荧光光谱具有宽的发光带，激发光谱存在上转换现象. 关键词：     

Fabrication and Spectroscopic Characterization of Langmuir-Blodgett Films with Luminescent Rare Earth Complexes of Long Chain Double Functional Ligands Mono-L Phthalate (L = Hexadecyl, Octadecyl and Eicosyl)

In this paper, some novel long chain amphiphillic monoester molecules were designed to afford double functions: film-formation ability and luminescent sensitization ability. Subsequently organized molecular films of rare earth complexes with these functional ligands formulated as ML2NO3 were fabricated by the Langmuir-Blodgett film (LB) technology, where RE denotes rare earth ions Eu3+, Tb3+ and Dy3+; L denotes the long chain carboxylic ligands monohexadecyl phthalate (16-Phth), monooctadecyl phthalate (18-Phth) and monoeicosyl phthalate (20-Phth). The average molecular area was obtained according to the π-A isotherms. The layer structure of the LB films was demonstrated by low-angle X-ray diffraction and the average layer spacing was determined from the Bragg equation. UV absorption intensity increases linearly with the number of LB films layers, which indicates that the LB films are homogeneously deposited. The fluorescence spectra of these LB films were quite different from those of their solid complexes. It reveals that the long chain ester ligands are suitable for the excited states of Tb3+ and Dy3+ in the LB films as well as in the solid complexes, but not match with the europium ion in the LB films.     

Outcome of laryngeal and velopharyngeal biofeedback treatment in children and young adults: A pilot study

A relatively new management strategy for the treatment of voice disorders is the use of laryngeal (LB) and velopharyngeal biofeedback (VB). The main purpose of the present pilot study is to document the outcome of vocal and velopharyngeal performances after a well-defined LB and VB treatment. Four subjects were studied pretreatment (1 week before LB or VB treatment) and posttreatment (1 week after the LB or VB treatment). To measure and compare the effect of LB and VB, objective and subjective assessment techniques were used. Perceptual voice assessment included a perceptual rating of the voice using the GRBAS scale. Furthermore, the vocal quality in this population is modeled by means of the Dysphonia Severity Index. For the objective assessment of nasal resonance, the Nasometer and the Glatzel test were used. A perceptual evaluation of speech, the Gutzmann test, and the tests from Bzoch were used as subjective assessment techniques. Both patients selected for LB and VB treatment showed improvement of their performances. The resulting improvement, as measured by means of an objective approach, is in agreement with the perceived (auditory) improvement of voice and resonance. The use of LB and VB treatment in patients, especially in some subjects who are not responding to traditional voice or velopharyngeal therapy, must be encouraged.     

LB膜与表面增强拉曼光谱

本文介绍了LB膜分子结构、分子取向研究的表面增强拉曼散射(SERS)方法及SERS增强机理研究中LB技术的应用。