应力对铋系铁电薄膜性能影响的研究进展

应力普遍存在于铁电薄膜中,是影响薄膜性能和薄膜电子器件可靠性的一个重要参数.本文系统介绍了本小组近年来所进行的应力对铋系铁电薄膜(Bi3.25La0.75Ti3O12,Bi3.15Nd0.85Ti3O12 和SrBi2Ta2O9)的铁电性能及与铁电存储有关的开关、疲劳性能等影响的研究.结果表明:张应力有利于增大薄膜的剩余极化和开关电荷量,而压应力却使得两者都降低.还发现:应力对薄膜的开关时间、矫顽场、疲劳性能等都有影响.其结果都与“应力作用下薄膜内铁电畴的重新取向“有关.     

Modulated Terahertz Transmission through Sub-Wavelength Cu Grating by Liquid Water

Submerging the sub-wavelength Cu wire grating in liquid water, we prove that the transmission ration can be changed pronouncedly from 0.1THz to 1.7THz. The modulation of terahertz responses by liquid water is explained by the increasing effective electron mass in the plasmon picture. Due to this response, we extract the index of liquid water, and our results provide a potential application of using metal grating to detect real solvated condition biomaterials in the THz frequency range.     

两个含1-(1-萘甲基)咪唑的化合物：晶体结构和弱相互作用

1-(1-萘甲基)咪唑(L)和盐酸反应生成1-(1-萘甲基)咪唑盐酸盐L·HCl (1),在这个化合物中通过π-π堆积相互作用和氢键形成了二维超分子层。1-(1-萘甲基)咪唑(L)和AgPF₆反应生成单核银配合物[L]₂AgPF₆ (2),在这个化合物中通过2个类型的π-π堆积相互作用形成了二维超分子层。测定了L,1和2的荧光发射光谱。     

应力对铋系铁电薄膜性能影响的研究进展

应力普遍存在于铁电薄膜中，是影响薄膜性能和薄膜电子器件可靠性的一个重要参数。本文系统介绍了本小组近年来所进行的应力对铋系铁电薄膜（Bi3.25La0.75Ti3O12，Bi3.15Nd0.85Ti3O12和SrBi2Ta2O9）的铁电性能及与铁电存储有关的开关、疲劳性能等影响的研究。结果表明：张应力有利于增大薄膜的剩余极化和开关电荷量，而压应力却使得两者都降低。还发现：应力对薄膜的开关时间、矫顽场、疲劳性能等都有影响。其结果都与“应力作用下薄膜内铁电畴的重新取向”有关。     

海藻硫酸多糖抑制草酸钙结石形成的化学模拟

用体外模拟方法研究了从海藻异枝麒麟菜中提取的硫酸多糖(ESPS)对尿结石患者尿液中草酸钙晶体生长的影响. ESPS不但诱导与尿路细胞膜粘附力较弱的二水草酸钙晶体形成, 而且抑制一水草酸钙的生长和聚集, 归因于一水草酸钙的富钙(101)晶面与聚阴离子ESPS之间的静电相互作用. 上述结果表明, ESPS是一种抑制草酸钙结石的潜在绿色药物.     

海藻异枝麒麟菜多糖抑制尿石盐草酸钙晶体生长的研究

采用扫描电子显微镜(SEM)、 红外光谱(FTIR)和X射线衍射(XRD)方法研究了从海藻异枝麒麟菜中提取的硫酸多糖(ESPS)对草酸钙(CaOxa)晶体生长的影响. 结果表明, 添加ESPS能抑制一水草酸钙(COM)的生长, 同时诱导二水草酸钙(COD)晶体的形成. 随着ESPS的质量浓度从0增加到0.03和0.50 mg/mL, COD的质量分数从0分别增加到10%和55%; COM的(1 01)晶面加强, (020)晶面减弱直至消失, 并从三维晶体转变为棱角圆顿的四角形片状晶体; COM和COD的尺寸均明显变小. 这些结果表明, ESPS是抑制CaOxa结石形成的一种潜在药物.     

基于1-丁基苯并咪唑和对苯二甲酸混合配体的锌(Ⅱ)和铜(Ⅱ)一维配位聚合物:晶体结构和弱相互作用(英文)

用1-丁基苯并咪唑和对苯二甲酸与Zn(NO3)2.6H2O或Cu(NO3)2.3H2O反应合成了两个锌(Ⅱ)和钴(Ⅱ)的一维配位聚合物[Zn(L)2(TP)]n(1)和[Cu(L)2(TP)]n(2)(L=1-丁基苯并咪唑,TP=对苯二甲酸根)。配位聚合物1和2通过C-H…O或O-H…O氢键形成了二维超分子层。测定了L,1和2的荧光发射光谱。     

Effects of switching pulse width and stress on properties of Bi3.25La0.75Ti3O12 thin films

Polycrystalline ferroelectric Bi3.25La0.75Ti3O12 thin films are prepared on Pt/Ti/SiO2/Si substrates by the conventional metalorganic decomposition method.It is observed that with the increase of switching pulse width,the remnant polarisation and the coercive field increase.A wider switching pulse can result in poorer fatigue properties,which comes from more charged defects diffusing to and being trapped on domain walls.On the other hand,when the compressive stress is applied to films,the fatigue properties can be improved.This phenomenon is due to the reorientation of domains under stress.     

Two Cd(Ⅱ) and Cu(Ⅱ) Complexes Based on 1-Butylbenzimidazole: Crystal Structures and Weak Interactions

1-Butylbenzimidazole L reacted with Cd(NO3)2·4H2O to afford complex [CdL(NO3)3H2O]·[HL] 1. The heptacoordinated Cd(Ⅱ) center adopts a distorted pentagongal bipyramidal geometry, and complex [CdL(NO3)3H2O]-entity and the protonated benzimidazium salt [HL]+ are connected via N-H···O hydrogen bond to form a dimeric unit [CdL(NO3)3H2O]·[HL]. A 3-D supramolecular network of 1 is formed through N-H···O and O-H···O hydrogen bonds together with π-π stacking interactions. Reaction of L with CuCl2 afforded a mononuclear complex, [CuL2Cl2] 2, in which the tetracoordinated Cu(II) center adopts a distorted tetrahedral geometry. In contrast, 2-D supramolecular layers of 2 are formed by C-H···Cl hydrogen bonds. The fluorescent emission spectra of L, 1 and 2 are described.     

海带硫酸多糖防止草酸钙结石形成的体外模拟

采用扫描电子显微镜、X射线衍射法和红外光谱在草酸钙(CaOxa)结石患者尿液中研究了从海带中提取的硫酸多糖(LSPS)的防石作用.结果表明,LSPS可以抑制一水草酸钙(COM)的成核和聚集,并诱导二水草酸钙(COD)晶体形成.随着ESPS浓度从0增加到0.005, 0.02和0.20 mg/ml,COD的百分含量从0分别增加到22;, 55;和100;.这些结果表明LSPS是抑制CaOxa结石形成的一种潜在药物.