高密度可录光盘存储材料:金属卟啉配合物*

金属卟啉配合物在400-650 nm波段具有优良的光学性质,是一类新型高密度可录光盘存储介质材料.本文在总结近年来最新研究成果的基础上,阐述了金属卟啉配合物的结构特点、合成方法和作为高密度可录光盘存储介质的作用机理,讨论了影响卟啉配合物性质和光存储性能的主要因素,并对未来的发展趋势作了展望.     

可录型光盘与菁染料光存储媒体的研究进展

本文简介绍了可录型光盘光学数据存储过程和作为存储介质同的菁染料５的稳定性及其应用研究概况,学一些新型光存储技术作了简要评述,并讨论了可录型光存储材料的发展趋势。     

桥基取代的四氮杂大环配合物热力学稳定性的研究

用电位pH法测得了5,5,7,12,12,14-六甲基-1,4,8,11-四氮杂环十四烷与Co~(2+),Ni~(2+),Cu~(2+),Zn~(2+)生成配合物的稳定常数。探讨了它们在水溶液中的可能结构,并对大环碳上甲基取代的取代数与稳定常数间的关系作了研究.发现它们在水溶液中结构为五配位的四方锥体。大环碳原子上的氢被烷基取代后,配合物稳定性下降,下降的主要原因是空间效应并非电子效应之故.     

喹啉基氮杂大环铜,镍配合物的结构和性质差异

喹啉基氮杂大环铜、镍配合物的结构和性质差异安道利，卜显和，李金亮，陈荣悌（南开大学化学系，天津３０００７１）二氧四胺大环配体是Ｃｕ￣（２＋）、Ｎｉ￣（２＋）、Ｃｏ￣（２＋）、Ｐｔ￣（２＋）等金属离子的优良配体，它们同时具有饱和大环多胺和寡聚肽的结构特...     

1-甲基-1,4,7,10-四氮杂环十二烷镧配合物的合成及晶体结构

合成了1-甲基-1,4,7,10-四氮杂环十二烷(L)配体。在乙腈中培养了La(L)(CH_3CN)-(H_2O)(CF_3SO_3)_3配合物单晶,测定了其红外光谱和质子核磁共振谱。用X射线衍射方法测定了配合物的晶体结构,该晶体属于单斜晶系,P2_1/n空间群,a=0.9700(2)nm,b=1.5966(2)nm,c=1.9085(1)nm,β=104.71(3)°,V=2.8588(50)nm~3。配合物中镧为9配位,其配位多面体为扭曲的单帽四方反棱柱体。     

双N—乙酸取代氮氧杂大环及其镧系配合物的合成

首次合成了一种新的1.2-双(3,4:9,10-二苯并-5,8-二氧杂-1,12-二氮杂环十五烷-N-乙酸)乙烷大环配体,制备了它的8个镧系元素(La,Pr,Nd,Sm,EU,Gd,Dy,Yb)配合物,用红外光谱、元素分析、核磁共振谱及电导等方法进行了表征,讨论了可能的配位情况。     

氮杂大环钕配合物[Nd(L)(CH~3CN)(CF~3sO~3)~3]的合成和结构

本文报道了三价钕与氮杂大环(简称L)配合物的合成和晶体结构.配合物组成为[Nd(L)-(CH_3CN)(CF_3SO_3)_3],晶体属于三斜晶系,空间群为PI,晶胞参数α=0.8738(2),b=1.2870(3),c=1.2900(3)nm;α=85.63(2),α=87.25(2),γ=78.30(2)°;最终偏差因子R=0.0370,R_w00385.配合物中钕为8配位,其配位多面体为扭曲的四方反棱柱体.     

稀土氮杂大环多羧酸配合物Na［Ln（DOTMA）（H_2O）］·2H_2O的合成与表征

稀土氮杂大环多羧酸配合物Ｎａ［Ｌｎ（ＤＯＴＭＡ）（Ｈ_２Ｏ）］·２Ｈ_２Ｏ的合成与表征陈德福，金天柱（北京大学稀土材料化学及应用国家重点实验室，北京，１００８７１）关键词稀土，氮杂大环多羧酸，配合物核磁共振成像技术已成为肿瘤和其它病变组织的临床诊断及生...     

The Experimental Study of Acrylamide Based Photopolymer Recording Materials for Applications in Optical Holography

Summary: The photopolymer recording material based on acrylamide monomer has been experimentally studied. After illumination with an interference field, the photopolymerization process is initiated and a diffraction grating is formed in real-time. The performance of the material depends on its chemical composition and recording parameters. Due to its self-developing characteristics, the real-time measurement of hologram formation is used for detection of the recording process. From the measurement, properties of the material can be determined and optimized for different holographic applications.     

光信息记录材料介质及纳米物理显影核的研究与表征

本论文包括两部分内容,第一部分是光信息记录材料介质的研究,第二部分是纳米物理显影核的研究与表征,两者均属于信息记录材料领域研究的热门课题.     

Materials for Optical Data Storage

The outstanding feature of materials research in the eighties has been the convergence of basic research and practical application, leading to ever shorter cycles of innovation. This is especially true of materials which form the basis of key technologies. The mass storage units of the next generations of computers will be based on optical processes having a storage density which exceeds that of all hitherto known storage techniques that are practicable from the technical standpoint. In view of the fact that since 1982 read-only memories in the form of compact discs (CD-ROM) have become very successful in the field of audio electronics, research and development are now concentrated on materials for write-once (WORM) and erasable (EDRAW) storage systems. Suitable materials for optical data storage are substances in which data markings can be recorded and deleted respectively using semiconductor lasers. Materials development is centered on the synthesis of infrared-absorbing dyes for WORM memories and the production of rare earth/transition metal alloys for magneto-optical data recording. An introduction to CD-ROM technology will be followed by an overview of the state of development of the most important storage materials which are currently available commercially, and then the properties of these materials will be discussed with reference to selected examples.     

聚合物光盘基板材料

光盘是一种以非接触方式记录/再现信息的信息记录介质,主要由基板、记录层和保护层组成.其中,基板材料所用的光学塑料是光盘生产的主要原材料,对光盘的性能和成本构成至关重要.本文综述了聚合物光盘基板材料的研究现状及其发展趋势.光盘基板材料主要包括传统的聚碳酸酯(PC)、聚甲基丙烯酸甲酯(PMMA)、环氧树脂以及近年发展起来的非晶环烯烃聚合物.研制具有较低的双折射、吸湿性、固化成型收缩率以及较高的存储密度和存储寿命的光盘基板材料是聚合物光盘基板材料的一个重要研究领域.     

Optical Characteristics of Polymer Films Based on Bacteriorhodopsin for Irreversible Recording of Optical Information†

Bacteriorhodopsin (BR)‐containing polymer films have been developed in which photoinduced transformations of BR molecules take place during the process of photoinduced hydroxylaminolysis (PHA). The routine simplified scheme of the phototransformation is B?M ₄₁₂ in the case of polymer films based on nonmodified BR. In the case of polymer films based on BR modified by hydroxylamine (HA), this scheme is changed to where retinal oxime ( RO ) is a final product of chemical trapping of retinal by the HA molecule. Under certain conditions, the rate of RO to B regeneration is infinitely low. So, the irreversibility of RO formation allows one to use PHA for the preparation of films for irreversible write once recording. Some optical sensitometric characteristics are compared for polymer‐BR films and polymer‐BR–HA films. It has been shown that the photosensitivity level for polymer‐BR–HA films depends on the time after film preparation. A method is offered to increase the photosensitivity of polymer‐BR–HA films and to avoid the photosensitivity decrease with the time after film preparation.     

结合光学成像技术研究单颗粒碰撞电化学

近年来,单颗粒碰撞技术在纳米电化学领域受到广泛关注. 该技术通常控制超微电极处于某一电位,检测单个纳米颗粒随机碰撞到电极表面后产生的瞬时电流. 通过分析电流信号,可以研究单个纳米颗粒的性质. 尽管该技术可以检测单个纳米颗粒的电化学或电催化电流,但是传统的单颗粒碰撞技术缺乏空间分辨率,难以识别和表征特定的纳米颗粒. 因此,结合光学成像技术研究单颗粒碰撞电化学来补充电化学技术缺失的空间信息已成为一种趋势. 本文首先简要综述了单颗粒碰撞技术的三种检测原理,主要介绍了近年来单颗粒碰撞技术与荧光显微镜、表面等离激元共振显微镜、全息显微镜和电致化学发光相结合的研究进展,最后展望了单颗粒碰撞技术未来的发展趋势.     

多波长存储材料的合成与存储实验研究

报道了用有机光致变色的二芳基乙烯化合物作为多波长光存储记录材料的合成、膜片制作和多波长存储实验。结果显示,分别用1,2-双(2,5-二甲基噻吩-3-基)全氟环戊烯、1,2-双(2-甲基-5-醛基噻吩-3-基)全氟环戊烯和1,2-双(2-甲基-5-(2,2-二氰基乙烯基)噻吩-3-基)全氟环戊烯作为多波长光存储的记录材料,采用旋涂法(spin-coating)制成存储膜片,对应的读写激光器的波长分别532、650和780nm,实现了三波长光存储的信息记录和读出。     

An Overview of the Antimicrobial Properties of Lignocellulosic Materials

Pathogenic microbes are a major source of health and environmental problems, mostly due to their easy proliferation on most surfaces. Currently, new classes of antimicrobial agents are under development to prevent microbial adhesion and biofilm formation. However, they are mostly from synthetic origin and present several disadvantages. The use of natural biopolymers such as cellulose, hemicellulose, and lignin, derived from lignocellulosic materials as antimicrobial agents has a promising potential. Lignocellulosic materials are one of the most abundant natural materials from renewable sources, and they present attractive characteristics, such as low density and biodegradability, are low-cost, high availability, and environmentally friendly. This review aims to provide new insights into the current usage and potential of lignocellulosic materials (biopolymer and fibers) as antimicrobial materials, highlighting their future application as a novel drug-free antimicrobial polymer.     

聚合物光盘基板材料的研究进展

光盘是一种以非接触方式记录/再现信息的信息记录介质,主要由基板、记录层和保护层组成。其中,基板材料所用的光学塑料是光盘生产的主要原材料,对光盘的性能和成本构成至关重要。本文综述了聚合物光盘基板材料的研究现状及其发展趋势。光盘基板材料主要包括传统的聚碳酸酯（PC）,聚甲基丙烯酸甲酯（PMMA）、环氧树脂以及近年发展起来的非晶环烯烃聚合物。研制具有较低的双折射、吸湿性、固化成型收缩率以及较高的存储密度和存储寿命的光盘基板材料是聚合物光盘基板材料的一个重要研究领域。