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Search Results: 1 - 10 of 301456 matches for " CoFe/IrMn bilayer<br> "
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Thermal relaxation of exchange bias field in an exchange coupled CoFe/IrMn bilayer

Qi Xian-Jin,WangYin-Gang,Zhou Guang-Hong,Li Zi-Quan,Guo Min,

中国物理 B , 2010,
Abstract: This paper reports that a CoFe/IrMn bilayer was deposited by high vacuum magnetron sputtering on silicon wafer substrate; the thermal relaxation of the CoFe/IrMn bilayer is investigated by means of holding the film in a negative saturation field at various temperatures. The exchange bias decreases with increasing period of time while holding the film in a negative saturation field at a given temperature. Increasing the temperature accelerates the decrease of exchange field. The results can be explained by the quantitative model of the nucleation and growth of antiferromagnetic domains suggested by Xi H W et al. 2007 Phys. Rev. B 75 014434], and it is believed that two energy barriers exist in the investigated temperature range.
Dependence of Magnetoresistance on the Thickness of a Dusted Al Spacer Inserted in CoFe/Cu/CoFe Sandwiches
Dependence of Magnetoresistance on the Thickness of a Dusted Al Spacer Inserted in CoFe/Cu/CoFe Sandwiches

Yanxue CHEN,Shouguo WANG,Liangmo MEI,Kungwon Rhie,Sangjin Byeun,
YanxueCHEN
,KungwonRhie

材料科学技术学报 , 2002,
Abstract: A series of CoFe(4 nm)/ Cu(X nm)M(Y nm)/ CoFe(6 nm) samples have been prepared at room temperature. An exponential decay of the GMR( Giant Magnetoresistance) with Y was observed for fixed X=2nm. The characteristic decay parameter of Al is obtained to be about 0.26nm, which is rather close to 1 monolayer for Al. A coexistant state of GMR and AMR (anisotropic magnetoresistance) was observed when Y=2 nm. As the Cu spacer is replaced by Al layer, only AMR effect dominates. The experimental data further underline the important role played by the nonmagnetic spacers.
脂质体—神奇的药物递送系统
Liposome—A Novel Drug Delivery System
 [PDF]

王继波, 刘继民, 袁红梅
Hans Journal of Medicinal Chemistry (HJMCe) , 2016, DOI: 10.12677/HJMCe.2016.43003
Abstract:
近年来,脂质体已成为物理药学领域研究的热点,并且已经在许多方面显示出其潜在的应用价值。本文综述了脂质体的起源、基本概念、类型、制备方法、体内特性、质量控制和应用。脂质体的稳定性和靶向化设计是脂质体应用的根本。对脂质体的发展前景作了展望。
The study of liposome has become a focus in physical pharmacy recently and showed the prospective value of application in many ways. The summarization of origin, basic concept, types, preparation, in vivo characteristics, quality control and application of liposome was made. The stability and target design of liposome are the fundamentality of its application. The future development of liposome was viewed.
Combined effect of the transition layer and interfacial coupling on the properties of ferroelectric bilayer film

中国物理 B , 2009,
Abstract: Within the framework of modified Ginzburg--Landau--Devonshire phenomenological theory, a ferroelectric bilayer film with a transition layer within each constituent film and an interfacial coupling between two materials has been studied. Properties including the Curie temperature and the spontaneous polarization of a bilayer film composed of two equally thick ferroelectric constituent films are discussed. The results show that the combined effect of the transition layer and the interfacial coupling plays an important role in explaining the interesting behaviour of ferroelectric multilayer structures consisting of two ferroelectric materials.
Electrochemical studies of Meldola blue-modified bilayer lipid membranes

Lin Ding,Erkang Wang,

科学通报(英文版) , 1997,
Abstract: Conclusion The voltammetric characteristics of MB transport across BLM are concurrent with the first type of dyes in ref. 5]. There is no peak appearing in the range of potential window and the transferring can be regarded as an irreversible one. The transport is tightly related to the structure of the membrane. Oxidized cholesterol and lipid negatively charged inhibit the transport of MB. The pH of the aqueous solution also influences the transport. When the pH of the aqueous solution is close to the isoelectric point of the lipid, the voltammetric response is obvious. When the pH is lower than that of the isoelectric point, the transport will be inhibited. These results can be explained by considering the appearance of net positive charges at the surface of the membrane at lower pH. The above investigations can provide important information for further studying the catalysis of MB to some certain bio-active substances (such as NADH) at the surface of biomembranes.
Investigation of interfacial structure and property of CoFe/TiZr multilayers by polarized neutron reflectometry
CoFe/TiZr多层膜材料界面结构与性能的极化中子反射研究

VGSyromyatnikov,NKPleshanov,Huang Chao-Qiang,Chen Bo,Li Xin-Xi,VGSyromyatnikov,NKPleshanov,
黄朝强
,陈波,李新喜

物理学报 , 2008,
Abstract: 利用极化中子反射技术较系统地研究了CoFe/TiZr复合多层膜材料界面结构,结果表明.1)从多层膜超镜传输特性角度考虑,等厚对层不如非等厚对层膜结构好.2)等厚对层的最佳退火温度约250℃,非等厚对层退火温度低于250℃影响不明显,等厚和非等厚对层经350℃退火后膜层变化严重.3)从布拉格峰位变化看,随着退火温度的升高,等厚对层膜的厚度先变小后变大;非等厚对层与之相反.
Investigation of interfacial structure and property of CoFe/TiZr multilayers by polarized neutron reflectometry
CoFe/TiZr多层膜材料界面结构与性能的极化中子反射研究

Huang Chao-Qiang,Chen Bo,Li Xin-Xi,Syromyatnikov V G,Pleshanov N K,
黄朝强
,陈 波,李新喜,Syromyatnikov V. G.,Pleshanov N. K.

中国物理 B , 2008,
Abstract: 利用极化中子反射技术较系统地研究了CoFe/TiZr复合多层膜材料界面结构,结果表明.1)从多层膜超镜传输特性角度考虑,等厚对层不如非等厚对层膜结构好.2)等厚对层的最佳退火温度约250℃,非等厚对层退火温度低于250℃影响不明显,等厚和非等厚对层经350℃退火后膜层变化严重.3)从布拉格峰位变化看,随着退火温度的升高,等厚对层膜的厚度先变小后变大;非等厚对层与之相反.
GO/CoFe2O4催化过硫酸盐降解邻苯二甲酸二丁酯效能
赵莹,任月明,张慧玉,李胜男,马军
- , 2017, DOI: 10.11918/j.issn.0367-6234.201612067
Abstract: 为高效地去除水中环境激素类污染物, 采用共沉淀法合成了氧化石墨烯负载钴尖晶石铁氧体(GO/CoFe2O4)催化剂, 催化过硫酸盐(PMS)去除水中邻苯二甲酸二丁酯(DBP).采用SEM、TEM、XPS、XRD对催化剂进行表征, 研究不同条件下催化PMS去除水中DBP的效果, 提出催化PMS反应机理.结果表明, GO/CoFe2O4为颗粒状尖晶石结构, 室温下, DBP初始浓度为2 μmol/L、催化剂投量为0.1 g/L、PMS浓度为20 μmol/L、pH为7时, GO/CoFe2O4催化PMS体系对DBP的去除率可达89%, 使用5次后催化效果仅降低5%.该新型复合催化剂高效、具有磁性、方便回收, 具有良好的工程应用前景.
GO/CoFe2O4 was synthesized by coprecipitation to remove the environmental pollutants efficiently in the water. Dibutyl phthalate (DBP) was removed using the GO/CoFe2O4-catalyzed peroxymonosulfate (PMS). GO/CoFe2O4 was characterized by SEM, TEM, XPS and XRD. DBP removal efficiency was studied under different conditions in the water. The results showed that, at room temperature, the removal rate of DBP in the anometer spinel granulated GO/CoFe2O4/PMS oxidation reaction system, with the initial DBP concentration of 2 μmol/L, catalysts dosage of 0.1 g/L, PMS concentration of 20 μmol/L and pH of 7.0. The removal efficiency of DBP only decreased 5% after 5 times. The new composite catalyst had a potential engineering application prospect due to its high efficiency and easy recovery.
水热法制备p-CoFe2O4/n-CdS及其光催化制氢性能
Preparation of p-CoFe2O4/n-CdS by Hydrothermal Method and Its Photocatalytic Hydrogen Production Activity

胡海龙,王晟,(),侯美顺,刘福生,(),王田珍,李天龙,董乾乾,张鑫
- , 2017, DOI: 10.3866/PKU.WHXB201611241
Abstract: 水热法制备了系列p-n复合半导体p-CoFe2O4/n-CdS。采用X射线衍射(XRD)、冷场发射扫描电子显微镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)、透射电镜(TEM)和电化学工作站等对制得的光催化剂进行了结构和性能表征。研究了p-CoFe2O4/n-CdS复合光催化剂的可见光催化制氢性能及光腐蚀性能,并对光催化活性的提高、反应条件的影响及光腐蚀行为的抑制机理进行了分析。结果表明:由于CoFe2O4和CdS两种窄带隙半导体复合增加了光吸收率;CdS独特的树形结构以及CoFe2O4和CdS二者复合所产生的能带交迭和内建电场的三重作用,促进了电子从CoFe2O4向CdS的迁移,减少电子-空穴对复合的概率,增强了光催化活性。光生电子-空穴对的分离效率以及光催化剂表面吸附性能都对产氢速率有重要影响。CH3OH水溶液的pH对光催化剂中光生电子-空穴对的分离效率以及光催化剂表面吸附性能都有影响。牺牲剂CH3OH的加入以及CoFe2O4和CdS二者复合所产生的能带交迭和内建电场的作用都对CdS的光腐蚀起了抑制作用,后者的抑制效果更好。
A series of p-n coupled p-CoFe2O4/n-CdS photocatalysts were prepared by a hydrothermal method. The structure and properties of p-CoFe2O4/n-CdS were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM) and the electrochemical workstation. The photocatalytic activities of p-CoFe2O4/nCdS were evaluated by photocatalytic hydrogen production under visible light irradiation. The effects of photocorrosion of CdS in p-CoFe2O4/n-CdS were investigated by analyzing the cadmium concentration of the supernatant collected after the photocatalytic reactions. The mechanism of the catalytic activity enhancement, effects of reaction conditions on the photocatalytic hydrogen evolution rate, and cadmium leakage resistance are discussed. The results show that p-CoFe2O4/n-CdS exhibits higher photocatalytic activity attributed to stronger light absorption by the two types of narrow band gap semiconductor CoFe2O4 and CdS, the formation of a "forest-like" structure of CdS and rapid electron transfer from CoFe2O4 to CdS, resulting from band overlap and an inner electric field in p-CoFe2O4/n-CdS, to reduce the probability of electron/hole pair recombination. Both the separation efficiency of photo-generated electron-hole pairs and the adsorption performance of photocatalysts had an important influence on the hydrogen production rate. The pH of the CH3OH aqueous solution influenced the separation efficiency of photogenerated electron-hole pairs and the adsorption properties of the photocatalyst. p-CoFe2O4/n-CdS also exhibited resistance against cadmium leakage under light irradiation owing to the presence of methanol in the reaction solution, the band overlap of the semiconductors and the inner electric field in p-CoFe2O4/n-CdS. The band overlap and inner electric field had the most influence on the cadmium leakage resistance
Free Volume in Membranes: Viscosity or Tension?  [PDF]
V. S. Markin, F. Sachs
Open Journal of Biophysics (OJBIPHY) , 2015, DOI: 10.4236/ojbiphy.2015.53007
Abstract: Many papers have used fluorescent probe diffusion to infer membrane viscosity but the measurement is actually an assay of the free volume of the membrane. The free volume is also related to the membrane tension. Thus, changes in probe mobility refer equally well to changes in membrane tension. In complicated structures like cell membranes, it appears more intuitive to consider variations in free volume as referring to the effect of domains structures and interactions with the cytoskeleton than changes in viscosity since tension is a state variable and viscosity is not.
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