Ethoxy‐substituted Oligo‐phenylenevinylene‐Bridged Organic Dyes for Efficient Dye‐Sensitized Solar Cells

Organic dyes with ethoxy‐substituted oligo‐phenylenevinylene as chromophores were synthesized for dye‐sensitized solar cells (DSSCs), and the detailed relationships between the dye structures, photophysical properties, electrochemical properties, and performances of DSSCs were described. The dye S3O showed broad IPCE spectra in the spectral range of 350–750 nm, and the dye S1P showed solar energy‐to‐electricity conversion efficiency (() of up to 4.23% under AM 1.5 irradiation (100 mW/cm²) in comparison with the reference Ru‐complex (N719 dye) with an η value of 5.90% under similar experimental conditions.     

毛细管胶束电动色谱分离测定大米中农药类环境激素乐果、克百威和灭多威残留

用毛细管胶束电动色谱分离测定了3种农药类环境激素乐果、克百威和灭多威在大米中的残留。考察了电泳缓冲溶液的pH值、浓度及表面活性剂浓度等影响因素,在pH=7.0的20mmol/L硼酸-四硼酸钠缓冲溶液+70mmol/L十二烷基硫酸钠(SDS)+10%甲醇体系中,三组分在16min内得到基线分离。乐果、克百威及灭多威的检测限分别为0.01、0.02和0.008mg/kg,回收率范围为101.31%～102.63%,相对标准偏差(RSD)<5%。该方法具有操作简单、快速、重现性好等优点。     

Determination of Steroids in Human Urine by Micellar Liquid Chromatography

Abstract

A simple and sensitive method for the determination of steroids using micellar liquid chromatography is described. The steroids, including hydroxycorticosterone. corticosterone, northisterone, testosterone, mexdroprogesterone acetate and progesterone, were separated by reversed-phase using a micelles mobile phase following UV detection at 245 nm. The parameters affecting retention of the test solutes such as the concentration of sodium dodecyl sulfate (SDS) and n-butanol-1 in the mobile phase were investigated. It was found that the retention of the solutes was dependent on the composition of mobile phase. The linear calibration plots range from 0.1 to 10 μg ml^?1 in mobile phase containing 5.0 × 10^?2 mol l^?1 SDS/9 % n-butanol-1 at pH 6.0, and the detection limit in order of 0.1 μg ml^?1 was obtained. The proposed method was used for the determination of steroids in urine using direct injection of samples without previous treatment.     

Metal‐Free Organic Dyes for Dye‐Sensitized Solar Cells: From Structure: Property Relationships to Design Rules

Works without ruthenium as well : Dye‐sensitized solar cells (DSSCs) incorporating metal‐free organic dyes have been considerably improved in recent years. Various design strategies have been established and are employed successfully in the synthesis of novel sensitizers. In this Review, structure–property–efficiency correlations are deduced from a vast number of dyes, which should help to design new and highly efficient sensitizers.

     

Photoinduced Charge Separation in an Aqueous Phase Using Nanoporous TiO2 Film and a Quasi‐Solid Made of Natural Products

Solar cells comprised of nanoparticulate TiO₂ porous film photosensitized with an adsorbing dye have been utilized as photoinduced charge separation systems in aqueous media with the view to forming future artificial photosynthetic systems able to create fuels from solar energy and water. The photoinduced charge separation of the sensitized TiO₂ cell in a quasi‐solid, made from agarose or κ‐carrageenan, was investigated.

I–V curves under 98 mW · cm⁻² irradiation of ITO/TiO₂/Ru(dcbpy)₂(NCS)₂. Electrolyte: 0.1 M LiI/0.01 M I₂ in a quasi‐solid of 0.2 wt.‐% gelatin containing a large excess of water.