5-对羧基苯基-10,15,20-三间羟基苯基二氢卟吩的合成

以4-甲酰基苯甲酸甲酯、3-羟基苯甲醛及吡咯为原料,通过Alder反应制得5-对甲氧酰基苯基-10,15,20-三间羟基苯基卟啉,再经酯解、还原及选择性氧化制得目标化合物5-对羧基苯基-10,15,20-三间羟基苯基二氢卟吩,总收率4.92%。其结构经UV、IR、MS、1H MNR表征。     

An Insight into the Role of Non-Porphyrinoid Photosensitizers for Skin Wound Healing

The concept behind photodynamic therapy (PDT) is being successfully applied in different biomedical contexts such as cancer diseases, inactivation of microorganisms and, more recently, to improve wound healing and tissue regeneration. The effectiveness of PDT in skin treatments is associated with the role of reactive oxygen species (ROS) produced by a photosensitizer (PS), which acts as a “double agent”. The release of ROS must be high enough to prevent microbial growth and, simultaneously, to accelerate the immune system response by recruiting important regenerative agents to the wound site. The growing interest in this subject is reflected by the increasing number of studies concerning the optimization of relevant experimental parameters for wound healing via PDT, namely, light features, the structure and concentration of the PS, and the wound type and location. Considering the importance of developing PSs with suitable features for this emergent topic concerning skin wound healing, in this review, a special focus on the achievements attained for each PS class, namely, of the non-porphyrinoid type, is given.     

金属有机类光敏剂在染料敏化太阳能电池中的应用

在染料敏化太阳能电池(DSSC)中,染料敏化剂用以吸收光子,具有较宽光谱吸收范围,它直接决定了电池的能量转换效率,因而近年来得到飞速发展,成果显著。论文以钌基多吡啶配合物染料为主,综述了包括卟啉、酞菁及纯有机染料在内的多种光敏剂的设计合成路线、特点及其对染料敏化太阳能电池性能的影响,并展望了今后染料敏化剂的研究与开发思路。     

LED光照灭菌技术在果蔬保鲜加工中的

综述了可见光LED灯和紫外LED灯的特性、灭菌机理和灭菌效果,同时介绍了在几种不同光敏剂辅助灭菌情况下可见光LED灯和紫外LED灯的灭菌效果,及所使用光敏剂的剂量、效果和作用的菌种。最后提出了LED光照灭菌技术存在的问题,并展望未来发展方向。     

光纤端部微型透镜的研究

在光刻热熔法的基础上 ,研究使用掺有重铬酸盐的明胶在光纤端部制备微型透镜的工艺 .分析了重铬酸铵明胶体系的辐射交联和光敏机理 ,阐述了配制、曝光、显影和热熔成形的实验方法 ,同时研究曝光机理和显影机理以确定最佳浓度和质量比、曝光时间、显影时间等工艺参数 .提出了凸透镜表面的形成问题 ,对熔融态的重铬酸铵明胶的浸润特性和临界角作了讨论 ,并以此作为热熔温度及时间的理论基础 .结果说明 ,实验制备的微型透镜具有很好的面形 ,透光性能良好 ,适合安装在光纤端部以进一步增强聚光性能     

芦荟大黄素在不同溶剂体系中的光谱特性研究

目的:检测芦荟大黄素在不同溶剂体系中的光谱特性,为芦荟大黄素的光动力学研究提供试验资料.方法:用紫外可见分光光度计和荧光分光光度计测定芦荟大黄素在二甲基亚砜,生理盐水,人血白蛋白中的吸收光谱和荧光光谱.结果;芦荟大黄素在二甲基亚砜,生理盐水,人血白蛋白中最大吸收波长分别为415nm、421nm、420nm,荧光最大激发波长为422nm、435nm、426nm,荧光最大发射波长为583nm、575nm、580nm.     

Polymer-sensitized photoelectrochemical solar cells based on water-soluble polyacetylene and β-In2S3 nanorods

In this paper, we present a method for preparing polymer-sensitized photoelectrochemical solar cells (PECs) using water-soluble acetylene polymer photosensitizers and β-In₂S₃ nanorods. Since water-soluble acetylene polymers are hydrophilic, they were able to overcome the problems associated with the adhesion of hydrophobic polymers and were well matched with the hydrophilic β-In₂S₃ surface. The polymer layers were easily prepared by dipping the β-In₂S₃ nanorods films in an aqueous polymer solution, and the resulting polymer-sensitized PECs showed a power conversion efficiency of 1.63% under air mass 1.5 conditions (I = 80 mW/cm²).     

Supramolecular Photothermal Nanomaterials as an Emerging Paradigm toward Precision Cancer Therapy

The concept of the “supramolecular photothermal effects” refers to the collection property and photothermal conversion efficiency resulting from the supramolecular assembly of molecular photothermal sensitizers. This review considers organic supramolecular photothermal materials assembled at the nanoscale via various molecular self‐assembly strategies and associated with the organization of multiple noncovalent interactions. In these materials, the individual photosensitizer molecules are typically aggregated through self‐assembly in a certain form that exhibits enhanced biostability, increased photothermal conversion efficiency with photoluminescence quenching, and improved photothermal therapeutic effects in comparison with those of the monomeric photosensitizer molecules. These supramolecular photothermal effects are controlled or influenced by intermolecular noncovalent interactions, especially the hydrophobic effects, which are distinct from the mechanisms of conventional sensitizer molecules and polymers and inorganic photothermal agents. A focus lies on how self‐assembly strategies give rise to supramolecular photothermal effects, including polymer and protein fabrication, small molecule self‐assembly, and the construction of donor–acceptor binary systems. Emphases are placed on the rational design of supramolecular photothermal nanomaterials, drug delivery, and in vivo photothermal therapeutic effects. Finally, the key challenges and promising prospects of these supramolecular photothermal nanomaterials in terms of both technical advances and clinical translation are discussed.     

Preparation and characterization of low‐density polyethylene/banana starch films containing compatibilizer and photosensitizer

Composite films containing various percentages of banana starch and low‐density polyethylene (LDPE) were prepared. The effects of the compatibilizer, banana starch content, and photosensitizer content on the thermal and tensile properties of these films were investigated. The banana starch content was varied from 5 to 20 wt % of LDPE, whereas benzophenone was added as a photosensitizer in three different amounts (0.25, 0.5, and 1 wt %) based on LDPE. In these films PE‐graft‐maleic anhydride (PE‐g‐MA) was used as a compatibilizer at 10 wt % banana starch. It was found that the thermal stability of the composite films remained unchanged with respect to the amount of banana starch and benzophenone content. The addition of banana starch had no effect on the melting temperature and degree of crystallinity of the films. Similarly, PE‐g‐MA had no effect on the melting temperature but decreased the degree of crystallinity of the LDPE phase. Benzophenone caused an increase in the melting temperature but decreased the degree of crystallinity of LDPE in the films. Increasing the amount of banana starch decreased the tensile properties of the composite films. The addition of PE‐g‐MA as a compatibilizer increased the tensile properties compared with the uncompatibilized films. However, benzophenone had no effect on the tensile properties of the blend films. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2717–2724, 2006     

TiO_2光催化还原CO_2技术的研究进展

介绍了TiO_2的结构和性质,以及其催化还原CO_2的反应机理。分析了非金属沉积、贵金属沉积、半导体复合和有机光敏剂改性等4类Ti基催化剂光催化还原CO_2的性能。