Chiral Morphology of Calcium Carbonate Mineralized in Agarose Gel

Calcareous crystallites with chiral morphology are difficult to obtain in vitro . Using the d ‐form of aspartic acid as crystal modifier, calcium carbonate with chiral morphology has been obtained in agarose gel. We show that the formation of the chiral morphology of crystallites does not necessarily involve complicated cellular processes.     

Organic light-emitting diode performance enhancement via indium tin oxide glass surface modification

A self-assembly monolayer (SAM), with phenyl-triethoxysilane (PTES), was used to modify the indium tin oxide anode for an organic light-emitting diode (OLED) in order to improve the OLED performance. The enhancement of OLED performance is attributed to the blockage of excessive hole injection by PTES, balancing the hole and electron injection numbers. The result indicates that the SAM process reaction time duration greatly affects the OLED performance outcomes. If the reaction time is too long, it will impact on the optical efficiency due to molecular aggregates accumulated on the SAM layers, thus reducing the performance of the OLEDs. The electrical and optical characteristics of the OLEDs are modeled by using the modified Shockley equation. Modified Shockley parameters are extracted to interpret the experimental data with excellent accuracy. Those parameters, both electrical and optical, can be used as the DC level modeling parameters for OLED product design simulations.     

Characterization of Fluorescence Induced by Side Illumination of Rhodamine B Doped Plastic Optical Fibers

The impact of a post-OTDM-demultiplexing optical filter on the performance of dense on-off keying (OOK) optical time division multiplexing (OTDM)—wavelength division multiplexing (WDM) systems was studied. For return-to-zero (RZ) modulation, it was found that the additional filter working in a double-tier filter configuration did not offer any significant improvements to performance when the signal pulse width is optimized. Improvements generally increase only when the signal pulse width deviates from its optimal value and only for low spectral densities. For ideal non-return-to-zero (NRZ) modulation, however, significant improvements of around 1 dB are obtained using the double-tier configuration over a large range of spectral densities.     

Lipase catalyzed Cannizzaro-type reaction with substituted benzaldehydes in water

Lipases were found to catalyze Cannizzaro-type reaction of substituted benzaldehydes in aqueous medium at 30 °C without the addition of any external redox reagent. The ratio of alcohol product to acid product varied with nature of the substituted benzaldehyde, enzyme, and the presence of organic co-solvent.     

Properties of Low Density Polyethylene/Polypropylene Blends

ABSTRACT

The role of di-cumyl peroxide (DCP) as compatibilizer in low density Polyethylene/Polypropylene (LDPE/PP) blends has been explored. Mixtures with varying LDPE/PP ratio were prepared in a Brabender plasticorder and tested for their mechanical properties and calorimetric response. Then peroxide was added at concentrations up to 0.5%, and the mechanical properties of the these new blends were measured. Also, the mixing torque, melt flow index and gel content of the above products were recorded as a function of peroxide concentration. It was found that the incorporation of DCP restricts the thermoplastic characteristics of the melt, which was primarily attributed to branching which occurs in LDPE. This results in an enhancement in the adhesive bonding between the two polymers mainly due to chain entanglements. This was further supported by the fact that mechanical properties of the treated blend were significantly improved.     

Preparation of aminofunctionalized TiO2 surfaces by binding of organophosphates

Titanium dioxide (TiO₂) powder was chemically modified with 2-aminoethyl dihydrogen phosphate (AEPH₂) and with 2-aminoethyl hydrogen ammonium phosphate (AEPHNH₄) in order to achieve an aminofunctionalized high-surface-area TiO₂ carrier suitable for more complex functionalizing. AEPH₂ was found to form the monoammonium salt AEPHNH₄ with ammonium ion rather than the diammonium salt AEP(NH₄)₂. The AEPHNH₄ was thoroughly characterized by various techniques and compared with AEPH₂. Bonding of AEPH₂ and AEPHNH₄ with TiO₂ powder was studied. According to the ³¹P NMR and elemental analysis results, AEPH₂ and AEPHNH₄ form covalent chelate bidentate bonds between the phosphate group and the TiO₂, while the amino groups remain accessible, creating uniform aminofunctionalized TiO₂ surface fully occupied by AEP groups. Amount of AEP groups on TiO₂ was limited to 1.5 wt-%.     

二硫化钼量子点/还原氧化石墨烯复合材料的制备及其光催化降解有机染料、四环素和Cr（VI）

以钼酸钠、L-半胱氨酸和氧化石墨烯为原料,采用一锅溶剂热还原法制备了二硫化钼量子点/还原氧化石墨烯（MoS₂ QDs/rGO）复合材料,分别以罗丹明B、亚甲基蓝、四环素和Cr（VI）为目标污染物,研究了复合材料的可见光响应光催化降解性能。结果显示,MoS₂ QDs/rGO对两种染料和Cr（VI）的光催化降解率均可达97%以上,对四环素的光催化降解率为69%;循环使用10次,对目标染料的降解率均保持在90%以上。说明MoS₂ QDs/rGO具有良好的催化活性和稳定性。在降解体系中分别加入异丙醇、对苯醌和乙二胺四乙酸二钠捕获剂,结果显示,超氧自由基（?O₂^-）是MoS₂ QDs/rGO光催化反应的主要活性物种。     

Controllable Photoelectric Properties of Carbon Dots and Their Application in Organic Solar Cells

Organic solar cells are a current research hotspot in the energy field because of their advantages of lightness,translucency,roll to roll printing and building integration.With the rapid development of small molecule acceptor materials with high-performance,the efficiency of organic solar cells has been greatly improved.Further improving the device efficiency and stability and reducing the cost of active layer materials will contribute to the industrial development of organic solar cells.As a novel type of carbon nanomaterials,carbon dots gradually show great application potential in the field of organic solar cells due to their advantages of low preparation cost,non-toxicity and excellent photoelectric performance.Firstly,the synthesis and classification of carbon dots are briefly introduced.Secondly,the photoelectric properties of carbon dots and their adjusting,including adjustable surface energy level structure,good film-forming performance and up/down conversion characteristics are summarized.Thirdly,based on these intrinsic properties,the feasibility and advantages of carbon dots used in organic solar cells are discussed.Fourthly,the application progress of carbon dots in the active layer,hole transport layer,electron transport layer,interface modification layer and down-conversion materials of organic solar cells is also reviewed.Finally,the application progress of carbon dots in organic solar cells is prospected.Several further research directions,including in-depth exploration of the controllable preparation of carbon dots and their application in the fields of interface layer and up/down conversion for improving efficiency and stability of device are pointed out.