Gas-phase production of multifunctional composite nanoparticles by photoinduced chemical vapor deposition

As these results indicate, photo-CVD coating is a robust process that allows for the creation of core-shell nanoparticles. In the present work we demonstrated that photo-CVD can effectively coat Fe2O3 particles with silica for purposes of biological applications. TDMA results combined with TEM images indicate that all particles are effectively coated and that particle coating thicknesses can be tuned to desired thickness depending on the application. In addition, the ability to vary coating properties and to coat high concentrations of particles makes this technique of interest for industrial production where uniform properties are needed for large quantities of particles [2]. Copyright © 2010 by ASME.

云南龙陵黄山羊的核型及C－带和Ag－NOR_s研究

采用外周血淋巴细胞培养及染色体分带技术，分析了龙陵黄山羊的核型，Ｃ—带和银染核仁组织区（Ａｇ—ＮＯＲ＿ｓ），结果表明：龙陵黄山羊染色体数为２ｎ＝６０，常染色体及Ｘ染色体为端部着丝粒染色体，Ｙ染色体最小，为中部着丝粒染色体。常染色体着丝粒区均显示Ｃ—带，性染色体未显Ｃ—带．雌性银染核仁组织区（Ａｇ—ＮＯＲ＿ｓ）分布于Ｎｏ．１，２，３，４，５，２５号染色体，雄性分布于Ｎｏ．１，２，２５号染色体，显示了性别及分布多态性。研究还发现三种不同的联合（ＡＳＳＯＣＩＡＴＩＯＮ）。

A solid-state dye-sensitized solar cell based on a novel ionic liquid gel and ZnO nanoparticles on a flexible polymer substrate.

This paper describes a new strategy to make a full solid-state, flexible, dye-sensitized solar cell (DSSC) based on novel ionic liquid gel, organic dye, ZnO nanoparticles and carbon nanotube (CNT) thin film stamped onto a polyethylene terephthalate (PET) substrate. The CNTs serve both as the charge collector and as scaffolds for the growth of ZnO nanoparticles, where the black dye molecules are anchored. It opens up the possibility of developing a continuous roll to roll processing for THE mass production of DSSCs.

云南高黎贡山白颌大角蟾的核型、C-带及Ag-NORs的研究

比较了云南高黎贡山地区的贡山独龙江和腾冲大蒿坪白颌大角蟾（Megophryslateralis）两个地理种群的核型、C-带和Ag-NORs结果表明，两个地理种群在核型和带型上都有差异两个地理种群的核型均为2n＝26，NF＝52染色体形态差异不明显，而次缢痕的位置完全不同，贡山独龙江标本的次缢痕位于No．2的长臂上近着丝点处，腾冲标本的次缢痕位于No．5的短臂上近着丝点的部位在腾冲标本中发现一雄性个体中有一条额外的染色体，可能是B染色体两地标本的C-带差异不太显著，贡山独龙江标本的C-带相对较为显著．贡山独龙江标本的Ag-NORs位于No．2长臂近着丝点处，与次缢痕的部位对应，两条同源染色体上大小有显著差异．腾冲标本的Ag-NORs位于No．5短臂上近着丝点处，与次缢痕的部位对应依据核型和带型的比较，对白颌大角蟾的分类和进化问题进行了讨论。

尼罗罗非鱼染色体的C带、Ag带和减数分裂联会复合体的研究

以Sumner法和界面铺张-硝酸银技术观察, 表明尼罗罗非鱼的2n=44, 核型可分为3组,各具4对亚中着丝粒染色体、17对亚端着丝粒染色体和1对端着丝粒的特大染色体。结构异染色质主要分布于着丝粒附近, 其中Nos.6、8、15亚中着丝粒染色体短臂全部深染。带有银染核仁组织者(Ag-NORs)染色体的数目为2—6条, NORs均位于6、8、15亚中着丝粒染色体短臂。银染色可清楚显示联会复合体(SC)结构和减数分裂行为。SC组型与有丝分裂染色体的组型有较好的一致性 。图版2图2表2参13

两种长臂猿染色体的C带和Ag-NORs的比较研究

白眉长臂猿和白颊长臂猿的染色体C带核型中除多数染色体有着丝点C带外,一些染色体上还出现插入C带和着丝点C带弱化或减少现象;白眉长臂猿有全异染色质臂;白颊长臂猿有较多的端位C带。白眉长臂猿有两个Ag-NORs,而白颊长臂猿的Ag-NORs雌体有4个,雄体有5个,Y染色体上有NOR。

Thermal plasma synthesis of superparamagnetic iron oxide nanoparticles

Superparamagnetic iron oxide nanoparticles were synthesized by injecting ferrocene vapor and oxygen into an argon/helium DC thermal plasma. Size distributions of particles in the reactor exhaust were measured online using an aerosol extraction probe interfaced to a scanning mobility particle sizer, and particles were collected on transmission electron microscopy (TEM) grids and glass fiber filters for off-line characterization. The morphology, chemical and phase composition of the nanoparticles were characterized using TEM and X-ray diffraction, and the magnetic properties of the particles were analyzed with a vibrating sample magnetometer and a magnetic property measurement system. Aerosol at the reactor exhaust consisted of both single nanocrystals and small agglomerates, with a modal mobility diameter of 8-9 nm. Powder synthesized with optimum oxygen flow rate consisted primarily of magnetite (Fe 3O 4), and had a room-temperature saturation magnetization of 40.15 emu/g, with a coercivity and remanence of 26 Oe and 1.5 emu/g, respectively. © Springer Science+Business Media, LLC 2011.

Plasma stabilisation of metallic nanoparticles on silicon for the growth of carbon nanotubes

Ammonia (NH 3) plasma pretreatment is used to form and temporarily reduce the mobility of Ni, Co, or Fe nanoparticles on boron-doped mono- and poly-crystalline silicon. X-ray photoemission spectroscopy proves that NH 3 plasma nitrides the Si supports during nanoparticle formation which prevents excessive nanoparticle sintering/diffusion into the bulk of Si during carbon nanotube growth by chemical vapour deposition. The nitridation of Si thus leads to nanotube vertical alignment and the growth of nanotube forests by root growth mechanism. © 2012 American Institute of Physics.

Synthesis of 10 nm Ag nanoparticle polymer composite pastes for low temperature production of high conductivity films

The conversion of silver nanoparticle (NP) paste films into highly conductive films at low sintering temperature is an important requirement for the developing areas of additive fabrication and printed electronics. Ag NPs with a diameter of ∼10 nm were prepared via an improved chemical process to produce viscous paste with a high wt%. The paste consisted of as-prepared Ag NP and an organic vehicle of ethylcellulose that was deposited on glass and Si substrates using a contact lithographic technique. The morphology and conductivity of the imprinted paste film were measured as a function of sintering temperature, sintering time and the percentage ratio of Ag NP and ethylcellulose. The morphology and conductivity were examined using scanning electron microscopy (SEM) and a two-point probe electrical conductivity measurement. The results show that the imprinted films were efficiently converted into conducting states when exposed to sintering temperature in the range of 200-240 °C, this temperature is lower than the previously reported values for Ag paste. © 2010 Elsevier B.V. All rights reserved.