细乳液聚合制备聚苯乙烯包覆溶剂蓝36的纳米色料

通过细乳液聚合成功制备了聚苯乙烯包覆溶剂蓝36的纳米色料乳胶液。系统研究了憎水剂的种类、乳化剂的浓度、染料浓度以及均化时间对纳米色料微观形貌的影响。结果表明,当乳化剂马来酸酐单十六酯羧酸钠(HEC16)浓度控制在13.3mmol/L～20mmol/L之间,均化时间控制在20min,染料加入量控制在单体质量的10%左右的时候,采用十二烷基硫醇作为憎水剂,可以制备出粒径小于100nm、粒径分布窄且具有核壳结构的高颜色亮度的纳米色料乳胶粒子。

细乳液聚合法可聚合乳化剂制备高稳定性纳米色料的研究

采用可聚合型乳化剂马来酸酐单十六酯羧酸钠(HEC16),用细乳液聚合法制备了聚苯乙烯(PS)包覆蒽醌溶剂蓝36染料的纳米色料。系统研究了HEC16的浓度对乳胶粒子粒径及分布、储存稳定性、耐电解质稳定性以及冻融稳定性的影响。

纳米色料的制备及应用

纳米色料是一类可以结合颜料和染料两者优点的新型色料,除了在传统的着色领域具有独特优势外,在光电高新技术领域也具有广阔的应用前景。本文综述了国内外有机纳米色料在制备和应用上的最新研究进展,归纳出几种有代表性的制备有机纳米色料以及有机色料/无机物杂合纳米色料的最新研究方法。着重论述了细乳液聚合法制备纳米色料,对各种制备方法作出比较评价,并结合研究现状对纳米色料在光电领域的应用提出了一些设想。

可聚合乳化剂制备纳米色料的形貌及其影响因素

以α-烯烃磺酸钠（AOS）为可聚合乳化剂、苯乙烯（St）为非极性单体、甲基丙烯酸甲酯（MMA）为极性单体、二乙烯基苯（DVB）为交联剂、十六烷（HD）为助稳定剂,通过细乳液聚合法制备了聚合物包覆蒽醌类染料的纳米色料。利用透射电子显微镜（TEM）、激光粒度仪（DLS）等研究了可聚合乳化剂、极性单体和交联剂的用量对纳米色料形貌的影响。结果表明：该纳米色料具有明显的核壳结构,且乳液的稳定性好。随着乳化剂用量的增加,粒子粒径变小;少量极性单体的加入有助于得到粒径分布较窄的核壳结构纳米粒子,交联剂和单体彼此极性的差异会导致粒子表面粗糙。以St为聚合单体,当DVB的质量小于St质量的30%时,能够得到结构规整的纳米粒子,超过30%时,纳米粒子表面不再光滑。而以MMA为聚合单体,当DVB的质量为MMA的8%~30%时,粒子表面均凹凸不平。

微波水热合成纳米CoAl_2O_4色料的工艺研究

以Co Cl2·6H2O和Al Cl3为起始原料,Na OH为沉淀剂,用微波水热法合成了纳米Co Al2O4钴蓝色料。分别研究了填充度、p H值、n Co/n Al、起始原料浓度等对合成色料物相组成、颗粒大小与形貌和呈色的影响。用XRD、TEM和色度仪对样品进行了表征。结果表明：Co Cl2·6H2O和Al Cl3的浓度分别为0.15 mol/L和0.30 mol/L,在填充度为50%、p H值为13、n Co/n Al为1∶2的条件下,230℃微波水热反应3 h可制得呈色较好的尖晶石型钴蓝色料;其形态为八面体,晶型完整、发育良好,粒径多为70-80 nm左右。

BiOCl-Bi12O17Cl2 nanocomposite with high visible-light photocatalytic activity prepared by an ultrasonic hydrothermal method for removing dye and pharmaceutical

A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method.The texture,structure,optical,and photocatalytic properties of the composite were characterized.The results showed that the composite had a sheet flower-like structure with a large specific surface area.Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs.The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination.The composite’s reaction rate constant of removing rhodamine B(/ciprofloxacin)was approximately 8.14(/4.94),42.63(/11.91)and 64.66(/36.07)times that of Bi12O17Cl2,P25,and BiOCl,respectively.Furthermore,the composite showed a wide applicable pH range and excellent reusability.Mechanism analysis showed that photogenerated holes played a dominant role and·O2–also contributed to photocatalytic degradation.In summary,this study presents a high-efficiency photocatalyst for wastewater treatment.

The Influences of Ultrasonic on Embedding Nano Particles into Porous Fabric Materials

The feasibility of embedding 40nm ZnO particles into porous textile material by using ultrasonic and its influence factors were studied. Through investigations, it is proved that the higher the concentration of nanoparticle suspension is, the higher the weight of embedding percentage (EPW) is. However, the increasing trend of EPW will minish quickly when the concentration exceeds 1%. In addition, the longer the process time of ultrasonic is, the higher EPW is. EPW is always higher when the distance between film and ultrasonic transducer is 1/2λ and 3/2λ, and lower when the distance is 1λ and 2λ. For 40nm ZnO particles, EPW of the film effected by ultrasonic with the frequency of 42kHz reaches the maximum.

TiO_2-doped Fe_3O_4 nanoparticles as high-performance Fenton-like catalyst for dye decoloration

Fenton reaction based on Fe2+-H2O2 system has been widely applied in water remediation, but the obvious drawbacks largely hinder its practical uses. Alternatively, heterogeneous nanomaterials with proper surface modification could be used as Fenton-like catalysts. Surface doping of Ti O2 could concentrate the pollutants surrounding the Fe3O4 catalyst, which might benefit the catalytic performance of Fe3O4. Herein, we reported that Ti O2-doped Fe3O4 nanoparticles(NPs) could be used as high-performance Fenton-like catalyst for dye decoloration in near neutral environment, where the doping of Ti O2 on Fe3O4 surface dramatically improved the catalytic activity of Fe3O4 in Fenton-like reaction. Ti O2-doped Fe3O4 NPs catalyzed the decomposition of H2O2 to oxidize methylene blue without external energy supply, resulting in effective decoloration. Ti O2-doped Fe3O4 NPs showed high catalytic activity under various p H values and even in the presence of radical scavenger. More catalysts and H2O2 would facilitate the decoloration. At higher temperature, the decoloration became faster and more effective. The implication to the environmental applications of Ti O2-doped Fe3O4 NPs is discussed.

Inorganic electrochromic materials based on tungsten oxide and nickel oxide nanostructures

Electrochromic devices,which dynamically change color under applied potentials,are widely studied for use in energyefficient smart windows.The operation of electrochromic materials and devices involves the gain or loss of electrons and simultaneous insertion/extraction of ions with opposite charges to balance the internal electric fields.The performance is therefore limited by kinetics of charge transport in the electrochromic materials as well as ion migration in the electrolyte,materials and at their interfaces.Nanostructured electrochromic materials have an extremely short charge transport distance facilitating charge transport in electrochromic devices and large specific surface area for interaction with electrolytes,and thus may provide fast charge and ions transport,high electrochemical activities and remarkable enhancement of electrochromic properties.The recent progress in application of nanostructures,including nanoparticles,1D and 2D nanostructures,in metal oxide electrochromic materials and devices is reviewed.A perspective on the development trends in electrochromic materials and devices is also proposed.