La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的储氢性能研究

针对两种新型稀土型储氢合金La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2的储氢特性进行研究分析。实验表明,相同温度下,La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的PCT曲线基本重合,且都具有优良的吸氢动力学性能;相比之下,后者的滞后系数要小于前者,吸氢量较大,吸氢速率也较快,故其储氢性能较优。300次吸放氢循环实验结果表明,La0.5Y0.5Ni4.8Al0.2合金的吸氢动力学性能虽然略有下降,但抗粉化性能较好。     

Dy0.6Tb0.3Pr0.1(Fe0.95Mn0.05)x取向晶体的结构与磁致伸缩

采用Ｃｚｏｃｈｒａｌｓｋｉ方法生长了Ｄｙ０．６Ｔｂ０．３Ｐｒ０．１（Ｆｅ０．９５Ｍｎ０．０５）ｘ（１．８５≤ｘ≤１．９５）取向合金。所有合金主相为立方Ｌａｖｅｓ相结构,择优取向不完整择优取向的方向与Ｘ的大小有关。研究了沿着这些样品的生长方向的磁致伸缩性能以及磁致伸缩性能与压力之间的关系。     

Thermal Stability of Amorphous Hydride Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45)

The thermal stability of amorphous ternary hydrides Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45) and their corre-sponding amorphous binary alloys Mg_(50)Ni_(50) and Mg_(30)Ni_(70) were studied with X-ray diffraction(XRD) and differential scanning calorimetry(DSC). Samples of the amorphous alloys were preparedby mechanical alloying and the amorphous hydrides were obtained by charging the alloys with gas-eous hydrogen at 3.0 MPa and 423 K. It was found that the amorphous hydrides released most oftheir hydrogen before the crystallization of the essentially hydrogen depleted amorphous alloy. Thecrystallization temperature of amorphous Mg_(50)Ni_(50)H_(54) elevated and that of amorphousMg_(30)Ni_(70)H_(45) did not change in relation to the original binary amorphous alloy. This is very excep-tional for amorphous hydrides. The reason for the effects of hydrogen absorption/desorption on thecrystallization of amorphous alloys was discussed.     

Zr65Al7.5Ni10Cu15Co2.5合金的玻璃转变温度

根据Ｚｒ６５Ａｌ７。５Ｎｉ１０Ｃｕ１５Ｃｏ２。５合金的纳米晶，晶体，液体和玻璃比热的测量结果，研究了合金的玻璃转变温度与全金的热力学函数，动力学参数以及加热速度的关系。结果表明，非晶态合金玻璃转变所需转变激活能很小，玻璃转变温度实际上是由于加热速度引起的不同状态的玻璃与液体的热力学平衡温度。     

Natural Passivity of Amorphous Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 Alloys

The natural passive films forrned on Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 amorphous alloys long-term exposed in air have been studied by X-ray photoelectron spectroscopy (XPS) and Auger electron (including Ar+ ion depth profiling) spectroscopy (AES). The following aspects have been investigated: (1) chemical states of the elements in the films. binding energies and the chemical shifts measured by XPSf (2) structure and composition of the films fand (3) thickness of the passive films determined by AES depth profiling and XPS analysis.     

Acousto-optic interaction in alpha-BaB(2)O(4)and Li(2)B(4)O(7) crystals

Experimental studies and analysis of acousto-optic diffraction in alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are given. Ultrasonic wave velocity, elastic compliance and stiffness coefficients, and piezo-optic and photoelastic coefficients of alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are determined. The acousto-optic figure of merit has been estimated for different possible geometries of acousto-optic interaction. It is shown that the acousto-optic figures of merit for alpha-BaB(2)O(4) crystals reach the value M(2)=(270 +/- 70) x 10(-15) s(3)/kg for the case of interaction with the slowest ultrasonic wave. The directions of propagation and polarization of those acoustic waves are obtained on the basis of construction of acoustic slowness surfaces. The acousto-optic diffraction is experimentally studied for alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals.     

Nanomechanical characterization of one-step combustion-synthesized Al(4)B(2)O(9) and Al(18)B(4)O(33) nanowires

Two kinds of aluminum borate nanowires, Al(4)B(2)O(9) and Al(18)B(4)O(33), were successfully synthesized by a one-step combustion method through control of the Al:B atomic ratio and synthesis temperature. Both nanowires are single crystalline but have distinguishing growth habits. Nanoindentation tests were performed directly on individual nanowires to reveal their mechanical properties. A 70% reduction in elastic modulus was found in Al(18)B(4)O(33) nanowires compared with their bulk counterpart. Al(18)B(4)O(33) nanowires exhibited higher hardness and elastic modulus than Al(4)B(2)O(9) nanowires.     

Plasma surface treatments of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV)

The surfaces of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) were modified by oxygen and nitrogen plasma treatments. The physical and chemical surface characteristics were evaluated by contact angle tests, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). The plasma treatments caused an increase in both contact angle and roughening, altered the surface morphology, inserted polar groups, and, consequently, enhanced the hydrophilicity for both PLLA and PHBV polymers.     

An SANS Study of Decomposition Kinetics in Amorphous Cu_(12.5)Ni_(10)Zr_(41)Ti_(14)Be_(22.5)

Phase decomposition in amorphous Cu12.5Ni10Zr411Ti14Be22.5 alloy as annealed in the super-cooled liquid range was studied by applying small angle neutron scattering (SANS). As annealed between 600 K and 700 K, the alloy was observed to decompose into two new amorphous phases,with the second phase precipitates embedded in the matrix of the first. Long time annealing of the alloy results in crystallization in addition to evolution of the decomposed microstructure.The kinetic diagram of the decomposition and crystallization for this alloy is given. The second phase precipitates have several nanometers in size and occupy a quite low volume fraction. The decomposition of the supercooled liquid in overall temperature range exhibits the features of spinodal reaction.     

Work Functions of Pd_(83.5)Si_(16.5)and Cu_(70)Ti_(30)Glassy Alloys

The work functions before and aftercrystallization of two glassy alloys,Pd_(83.5)Si_(16.5) andCu_(70)Ti_(30) have been measured by means of the con-tact potential difference method in the secondaryelectron field at room temperature under 10~(-5) Pavacuum.The results show that the work functionsof both glassy alloys are higher than those of thecorresponding crystalline alloys.     

非晶态半导体 As_(24)Se_(76)、As_(40)Se_(60)和 As_(50)Se_(50)的光量子效率研究

光量子效率是非晶态光电导材料的一个重要参数。本文利用静电放电的方法,探讨和研究了 As—Se 系统非晶态半导体材料的光量子效率与电场和组份的关系,得出的结果与 Onsager 理论描述的相一致。由分析而得到了等剂量组份、富 As 和富 Se 系统光量子效率的变化趋势。     

聚(二甲基丙烯酸多缩乙二醇酯-甲基丙烯酸锂)固体电解质研究

以聚乙二醇(PEG)为原料,在PEG端基引入双键,合成了制备聚合物固体电解质的基体材料单体——二甲基丙烯酸多缩乙二醇酯(MEO_nM)。并研究了MEO_nM与甲基丙烯酸锂(MALi)的共聚、成膜反应,制备了单离子导电的共聚物薄膜。该薄膜既具有良好的导电性又具有良好的力学性能。其最高室温电导率可达10~(-6)Scm~(-1),100℃时可达10~(-4)Scm~(-1);而且在直流电压连续作用下,电导率-时间稳定性好,是理想的聚合物电解质材料。本文还研究了影响共聚物薄膜导电性和成膜性的因素。并采用DSC、X射线衍射等分析手段对共聚物的结构和形态进行了研究。     

TiCu_(0.5)Al_(0.5)Cr_(0.2)Ni_(0.1)高熵合金微观组织及性能研究

采用X射线衍射仪、光学显微镜、扫描电镜和透射电镜对TiCu_(0.5)Al_(0.5)Cr_(0.2)Ni_(0.1)高熵合金的相组成、相形貌、元素分布进行了系统研究,利用显微维氏硬度计测量了合金在室温下的硬度,通过电子万能试验机对合金进行了室温压缩试验,并在实验室模拟环境下进行合金防腐防污性能研究。结果表明:TiCu_(0.5)Al_(0.5)Cr_(0.2)Ni_(0.1)高熵合金主要由六方晶系Ti(CuAl)_2组成,大块状Ti(CuAl)_2相间存在条状组织,条状为AlCu_2Ti相,条间为CuTi_2相。树枝晶(DR)内Al元素和Cr元素含量较高,枝晶间(ID)Ti元素含量高于枝晶区域,而Ni元素和Cu元素整体分布较均匀。枝晶间(ID)显微硬度平均值为772HV,树枝晶DR显微硬度为690HV,枝晶间(ID)显微硬度高于树枝晶(DR)的;室温压缩强度为1 091 MPa。合金耐腐蚀性能良好,60℃人造海水中合金腐蚀失重量仅为-0.000 05 g,并具备一定的防污功能。     

Stabilization of Ferromagnetic Order in La(0.7)Sr(0.3)MnO(3)-SrRuO(3) Superlattices

The study of spatially confined complex oxides is of wide interest, since correlated electrons at interfaces might form exotic phases. Here La(0.7)Sr(0.3)MnO(3)/SrRuO(3) superlattices with coherently grown interfaces were studied by structural techniques, magnetization, and magnetotransport measurements. Magnetization measurements showed that ferromagnetic order in ultrathin La(0.7)Sr(0.3)MnO(3) layers is stabilized in the superlattices down to layer thicknesses of at least two unit cells. This stabilization is destroyed, if the ferromagnetic layers are separated by two unit cell thick SrTiO(3) layers. The resistivity of the superlattices showed metallic behavior and was dominated by the conducting SrRuO(3) layers, the off-diagonal resistivity showed an anomalous Hall effect from both SrRuO(3) and La(0.7)Sr(0.3)MnO(3) layers. This shows that the La(0.7)Sr(0.3)MnO(3) layers are not only ferromagnetic but also highly conducting; probably a conducting hole gas is induced at the interfaces that stabilizes the ferromagnetic order. This result opens up an alternative route for the fabrication of two-dimensional systems with long-range ferromagnetic order.     

Sr0.7La0.15Ce0.15Fe11.7Zn0.3O19/PAn复合材料的制备及微波吸收性能

用溶胶-凝胶法制备了La、Ce、Zn掺杂锶铁氧体Sr0.7La0.15Ce0.15Fe11.7Zn0.3O19纳米粉晶,再通过原位聚合反应法制备了掺杂锶铁氧体/聚苯胺(PAn)复合材料.用XRD、SEM、FTIR对样品进行表征,用微波网络分析仪测量了样品在2～12.4GHz频率范围的微波反射率(R).研究结果表明,聚苯胺包覆于掺杂锶铁氧体粒子表面,Sr0.7La0.15Ce0.15Fe11.7Zn0.3O19/PAn微波吸收性能优良,具有磁损耗和电损耗协同作用.复合样品厚度为3mm时,10GHz频率位置吸收峰值为-28dB,10>dB吸收带宽为4.7GHz.从R随频率变化的曲线趋势看,最佳匹配厚度为2.6mm,吸收峰值接近-40dB,峰值频率高于12.4GHz,>10dB吸收带宽预计达到5.5GHz.     

T(U)V南德意志集团大中华区获表彰

因积极参与浙江省质量技术监督局在2009年组织开展的"百家认证机构自律,万家认证企业帮扶"活动,且因认真组织开展对浙江省认证企业的自查和帮扶工作并取得了明显成效,在近日召开的浙江省认证工作会议上,T(U)V南德意志集团大中华区被评为此次活动的先进单位.     

预退火对合金Sm_5Fe_(74.3)Nb_(1.5)Si_(11.7)B_(4.5)C_(2.3)Cu_(0.5)的非晶结构影响

用XRS法测定Sm5Fe74.3Nb1.5Si11.7B4.5C2.3Cu0.5非晶合金在相同时间不同温度和在相同温度不同时间预退火条件下的短程有序范围、最近邻原子间距结构参数,从而讨论预退火对非晶结构的影响。结果表明,非晶合金由原始态加热到400oC范围内预退火,非晶短程有序范围会随温度升高而增大,到400oC时达最大值。随温度继续升高,超过400oC时,短程有序范围开始减小,而最近邻原子间距增大。在同一温度500oC不同预退火时间,短程有序范围随时间的延长而增大,最近邻原子间距随时间的增加而减小。     

Thermosensitive nanocontainers prepared from poly(N-isopropylacrylamide-co-N-(hydroxylmethyl) acrylamide)-g-poly(lactide)

Thermally-responsive graft copolymer of poly(N-isopropylacrylamide-co-N-(hydroxylmethyl)acrylamide)-g-poly(lactide) was synthesized by ring-opening polymerization of D,L-lactide (LA). The polymerization was initiated by the hydroxy group of poly(N-isopropyl acrylamide-co-N-(hydroxylmethyl) acrylamide), using stannous octoate as catalyst. The resulting polymer was temperature-sensitive and the lower critical solution temperature (LCST) was affected by their composition. The chemical structure and physical properties of the grafted copolymers were investigated by various methods. Nanocontainers formed from the self-assembly of poly(N-isopropylacrylamide-co-N-(hydroxylmethyl) acrylamide)-g-poly(lactide) were characterized by transmission electron microscopy (TEM), and a spherical structure was observed. Dynamic light scattering (DLS) results indicate that the particle size increased with the increase of polylactide content in the copolymer. The properties of this polymer are interesting for both industrial application and fundamental research. In particular it will combine a spatial specificity in a passive manner and a temperature-responsive active targeting mechanism for drug delivery system.