火焰原子吸收光谱法测定早熟禾中多种微量元素

目的测定早熟禾中多种微量元素的含量。方法早熟禾样品用浓硝酸经过消解,采用火焰原子吸收光谱法测定Fe、Zn、Mg、Ca、Mn的含量。结果早熟禾中Ca的含量最高,为1872.6 mg·kg-1,其次为Mg、Fe、Zn、Mn。其回收率在101.00%~120.07%,RSD2%。结论作为中草药,早熟禾中的微量元素含量较为合理,可作为其质量研究的参考依据。该方法简便,准确,可信,重现性好。     

Theoretical Prediction of the Photovoltaic Properties of BFBPD-PC_(61) BM System as a Promising Organic Solar Cell

In this work,the photovoltaic properties of BFBPD-PC_(61) BM system as a promising high-performance organic solar cell(OSC) were theoretically investigated by means of quantum chemistry and molecular dynamics calculations coupled with the incoherent charge-hopping model.Moreover,the hole carrier mobility of BFBPD thin-film was also estimated with the aid of an amorphous cell including 100 BFBPD molecules.Results revealed that the BFBPD-PC_(61) BM system possesses a middle-sized open-circuit voltage of 0.70 V,large short-circuit current density of 17.26 mA ·cm~(-2),high fill factor of 0.846,and power conversion efficiency of 10%.With the Marcus model,in the BFBPD-PC_(61) BM interface,the exciton-dissociation rate,kdis,was predicted to be 2.684×10~(13) s~(-1),which is as 3~5 orders of magnitude large as the decay(radiative and non-radiative) one(10~8~10~(10)s~(-1)),indicating a high exciton-dissociation efficiency of 100% in the BFBPD-PC_(61) BM interface.Furthermore,by the molecular dynamics simulation,the hole mobility of BFBPD thin-film was predicted to be as high as 1.265 × 10~(-2) cm~2·V~(-1)·s`(-1),which can be attributed to its dense packing in solid state.     

BTBPD-PC61BM体系光伏性质的密度泛函理论计算

Designing and fabricating high-performance photovoltaic devices have remained a major challenge in organic solar cell technologies.In this work,the photovoltaic performances of BTBPD-PC₆₁BM system were theoretically investigated by means of density functional theory calculations coupled with the Marcus charge transfer model in order to seek novel photovoltaic systems.Moreover,the hole-transfer properties of BTBPD thin-film were also studied by an amorphous cell with 100 BTBPD molecules.Results revealed that the BTBPDPC₆₁BM system possessed a middle-sized open-circuit voltage of 0.70 V,large short-circuit current density of 16.874 mA/cm²,large fill factor of 0.846,and high power conversion efficiency of 10%.With the Marcus model,the charge-dissociation rate constant was predicted to be as fast as 3.079×10¹³ s^-1 in the BTBPD-PC₆₁BM interface,which was as 3-5 orders of magnitude large as the decay (radiative and non-radiative) rate constant (10⁸-10¹⁰ s^-1),indicating very high charge-dissociation efficiency (～100%) in the BTBPD-PC₆₁BM system.Furthermore,by the molecular dynamics simulation,the hole mobility for BTBPD thin-film was predicted to be as high as 3.970×10^-3 cm²V^-1s^-1,which can be attributed to its tight packing in solid state.     

氨浸取粗氧化锌粉中锌的工艺研究

研究以粗氧化锌为原料制取活性氧化锌的浸取工艺。采用氨配合法将粗氧化锌中的锌充分浸取,以低级氧化锌为原料,对固液比、反应时间、碳酸氢铵用量、反应温度等因素先进行单因素实验,考察对氨配合法浸取率的影响,并在此基础上对主要的影响因素进行正交实验,从而优化出最佳浸取工艺条件为:浸取温度40℃,浸取时间3 h,固液比70 g/mL,碳酸氢铵用量2.5 g,浸取率可达92%。