共查询到18条相似文献,搜索用时 93 毫秒
1.
卟啉LB膜的分子取向,形貌和膜厚度研究 总被引:3,自引:0,他引:3
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 相似文献
2.
江月松 《光谱学与光谱分析》1999,19(2)
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。 相似文献
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江月松 《光谱学与光谱分析》1999,19(2):154-157
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。 相似文献
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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: 相似文献
5.
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。 相似文献
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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 总被引:1,自引:0,他引:1
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。 相似文献
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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。 相似文献
8.
江月松 《光谱学与光谱分析》1999,19(3)
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。 相似文献
9.
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。 相似文献
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小牛胸腺DNA分子Langmuir-Blodgett复合膜的表面增强拉曼光谱研究 总被引:1,自引:1,他引:0
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。 相似文献
12.
《Physics letters. A》1999,260(5):417-423
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. 相似文献
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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. 相似文献
16.
Kristiane M. Van Lierde Sofie Claeys Marc De Bodt Paul Van Cauwenberge 《Journal of voice》2004,18(1):97-106
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. 相似文献
17.
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。 相似文献
18.
红外透过、反射吸收光谱研究手性液晶(M1)LB膜的结构与取向 总被引:3,自引:1,他引:2
利用FTIR光谱研究了一种手性液晶化合物(M1)LB膜的结构与取向,该化合物可以形成稳定的单层与多层膜。手性分子中,芳香环平面向于垂直基片表面,分子中的烷基链部分则与基底表面法线方向成一定的角度。 相似文献