Peter J.Majewski
,
Tobias M.Fuchs
,
Shashi Prakash
,
Laure Tribalat
材料科学技术（英文）
The synthesis of organic self-assembled monolayers (SAMs) with –CH3, -SH, -SO3H, -CH3CO2, -NH, -NHCl, and -CN functionality onto silica particles and their properties has been studied and characterised by infrared spectroscopy and measurement of the zeta-potential of the resulting powder, respectively. The infrared measurements of the samples clearly show the presence of CH2-goups and the various functionalised head groups of the SAMs in the samples indicating a successful deposition of the SAMs onto the silica particles. The measurements of the zeta-potential of the samples show clear variations of their zeta-potential depending on the type of SAM compared to the zeta-potential of the pure silica powder used in this study. Even positive zeta-potential could be measured for silica powder coated with –NH2, -NHCl, and CN-SAM. After immersing into manganese chloride solutions, the presence of manganese oxide on the SAMs coated silica particles could be observed. This phenomenon is believed to be caused by precipitation of manganese oxide particles out of the solution onto the SAMs.
关键词:
Self-assembled monolayers
,
null
,
null
何贤美
,
童六牛
金属学报
用磁控溅射方法制备了Ni80Co20/M(M=Co,Cr,Ag)多层膜样品系列,Co,Cr,Ag杂质层的标称厚度为0.1 nm,研究了界面散射对多层膜的磁及输运性质的影响.零场电阻率ρ的测量结果表明,对含Cr样品,p随杂质层间距L的依赖关系能较好的用Fuchs-Sondheimer(F-S)理论描述.而对含Co和Ag样品,ρ随L的依赖关系在L小于15 nm时开始偏离F-S理论.磁电阻测量表明,含Cr和Ag样品,各向异性磁电阻△ρ在L＜15 nm时随L的减小陡然下降.对含磁性Co元素的样品,其△p值在L＞15 nm时高于Ni80Co20单层薄膜的△ρ值;在L＜15 nm时△p值随L呈现振荡变化的趋势.磁性测量表明,三个系列样品的矫顽力Hc在L＜15 nm时都随L近似直线上升,在L＞15 nm后趋于饱和;经400℃真空退火后Hc都显著下降.
关键词:
多层膜
,
null
何贤美
,
童六牛
金属学报
doi:10.3321/j.issn:0412-1961.2001.05.007
用磁控溅射方法制备了Ni80Co20/M(M=Co,Cr,Ag)多层膜样品系列,Co,Cr,Ag杂质层的标称厚度为0.1 nm,研究了界面散射对多层膜的磁及输运性质的影响.零场电阻率ρ的测量结果表明,对含Cr样品,p随杂质层间距L的依赖关系能较好的用Fuchs-Sondheimer(F-S)理论描述.而对含Co和Ag样品,ρ随L的依赖关系在L小于15 nm时开始偏离F-S理论.磁电阻测量表明,含Cr和Ag样品,各向异性磁电阻△ρ在L＜15 nm时随L的减小陡然下降.对含磁性Co元素的样品,其△p值在L＞15 nm时高于Ni80Co20单层薄膜的△ρ值;在L＜15 nm时△p值随L呈现振荡变化的趋势.磁性测量表明,三个系列样品的矫顽力Hc在L＜15 nm时都随L近似直线上升,在L＞15 nm后趋于饱和;经400℃真空退火后Hc都显著下降.
关键词:
多层膜
,
各向异性磁电阻
,
界面效应
刘勤
,
周善佑
材料研究学报
超塑性m-δ关系曲线可以分为m_L=m_(max)和m_L=m_(min)两大类型。均可由下面的C.L.(刘勤)m-σ方程表示:σ(%)=〔cε~(m-m_0)-1〕×100当σ=σ_0=0时,m=m_0≠0,C=C_0=κ_0/κ_0=1。当σ=σ_1(σ_(11),σ_(12),σ_(13),…,)时,m=m_1(m_(11),m_(12),m_(13),…),C=C_1(C_(11),C_(12),C_(13),…)=κ_1(κ_(11),κ_(12),κ_(13),…)/κ_0,当σ=σ_F时,m=m_F,C=C_F=κ_F/κ_0。对C 值进行“规划”,得到的C_1~(σ_O-σ_L)-(m_L=m_(max)),C_2~(σ_F-σ_L)-(m_L=m_(min)),C_3~(m_0-m_L)-(m_L=m_(max)和C_4~(m_F-m_L)-(m_L=m_(min))四种类型的“规划”方程分别对m_L=m_(max)和m_L=m_(min)型m-σ曲线适用。若m-σ曲线属简单的下降式,C 及其“规划”值均可近似地取1。否则,C-σ关系是应加以研究的问题。m 和k 值对σ值的效应可以分为动态(直接)和静态(间接)两种。最后的σ值是两种效应的综合结果。(注:m 和κ值见基本方程σ=κε~m)
关键词:
齐召庆
,
汪宏涛
,
薛明
功能材料
doi:10.3969/j.issn.1001-9731.2016.02.010
采用改进的非接触式混凝土收缩测定仪及标靶,研究了m(M)/m(P)比值(MgO与KH2PO4的质量比)对磷酸镁水泥石自收缩行为的影响,运用八通道微量量热仪、压汞仪、X射线衍射仪、扫描电子显微镜及能谱仪等分析手段,分析了m(M)/m(P)比值对磷酸镁水泥石自收缩的作用机理.结果表明,磷酸镁水泥石的自收缩呈现出3个阶段的特征,即早期的迅速收缩阶段、微膨胀阶段、收缩缓慢发展阶段.随着m(M)/m(P)比值的增大,由于磷酸镁水泥石的水化放热量降低,水泥石内部孔隙率增大,水化产物结晶度降低,水泥石结构疏松,所以,自收缩率减小.
关键词:
磷酸镁水泥
,
自收缩
,
m(M)/m(P)比值
Tesshu Miyahara
材料科学技术（英文）
Magnetic stripe is one of the major applications of magnetic materials. As a key component of the present card technologies magnetic stripes play reliable components for electronic data interchange in worldwide electronic payment systems such as financial cards, transit tickets and phone cards, etc. Magnetic stripes are available in various coercivity materials, widths, lengths, structures and colors with each types of transferable, lamination and pressure sensitive magnetic tapes of Deuton-M. Manufacturing process, structure and characteristics of Deuton-M magnetic tape and sheet are described.
关键词:
卞进田
,
孙晓泉
,
聂劲松
量子电子学报
doi:10.3969/j.issn.1007-5461.2008.02.019
为了得到2.7 μm波段可调谐激光辐射,设计了信号光单谐振荡KTP光参量振荡器(OPO),给出了KTP OPO II(B)类相位匹配方式下的角度调谐曲线、有效非线性系数.KTP晶体切割角为θ=62°,ψ=0°,有效非线性系数为-2.97 pm/V.利用该KTP OPO实现了2.6～2.8 μm波段范围可调谐激光输出,用脉宽为16 ns的基模高斯光束1.064 μm激光泵浦得到了最大能量578 μJ,能量转换效率达1.7%.
关键词:
非线性光学
,
可调谐红外激光
,
单谐振光参量振荡器
,
KTP
,
角度调谐
,
相位匹配
