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Precision Synthesis of Telechelic Poly(N-isopropylacrylamide) with Thiol-Termini for Construction of Homogeneous Network by Thiol-Ene End-Crosslinking 巯基端精密合成远旋聚n -异丙基丙烯酰胺,并通过巯基端交联构建均匀网络
Pub Date : 2018-04-01 DOI: 10.14723/TMRSJ.43.71
Shohei Ida, Masamitsu Yamawaki, T. Maruta, Y. Hirokawa
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引用次数: 3
Thermoelectric Properties of Mo and Ge co-substituted CrSi2 Mo和Ge共取代CrSi2的热电性质
Pub Date : 2018-04-01 DOI: 10.14723/TMRSJ.43.85
Hayato Nakasawa, T. Takamatsu, Yoshihiko Iijima, K. Hayashi, Y. Miyazaki
The thermoelectric properties of Mo and Ge co-substituted CrSi 2 have been investigated. Polycrystalline samples of (Cr 1− x Mo x )Si 2 ( x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) and (Cr 0.92 Mo 0.08 )(Si 1− y Ge y ) 2 ( y = 0, 0.01, and 0.02) were prepared by the two-step arc-melting method followed by spark plasma sintering and annealing. Powder X-ray diffraction confirmed that single-phase (Cr 1− x Mo x )(Si 1− y Ge y ) 2 samples were obtained. Mo and Ge co-substitution in CrSi 2 resulted in both an increase in the power factor and a large decrease in the thermal conductivity, which resulted in a high figure-of-merit ( zT ) value for the (Cr 0.92 Mo 0.08 )(Si 0.99 Ge 0.01 ) 2 sample ( zT = 0.29 at 700 K). This zT value is the highest reported value for CrSi 2 -based thermoelectric materials.
研究了Mo和Ge共取代crsi2的热电性能。采用两步电弧熔炼法制备了(Cr 1−x Mo x)Si 2 (x = 0、0.02、0.04、0.06、0.08和0.10)和(Cr 0.92 Mo 0.08)(Si 1−y Ge y) 2 (y = 0、0.01和0.02)多晶样品。粉末x射线衍射证实得到了单相(Cr 1−x Mo x)(Si 1−y Ge y) 2样品。Mo和Ge在CrSi 2中的共取代导致功率因数的增加和热导率的大幅降低,从而导致(Cr 0.92 Mo 0.08)(Si 0.99 Ge 0.01) 2样品的高品质系数(zT)值(700 K时zT = 0.29),该zT值是CrSi 2基热电材料报道的最高值。
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引用次数: 7
2-Hydroxytryptanthrin and 1-Formyl-2-hydroxytryptanthrin as Fluorescent Metal-ion Sensors and Near-infrared Fluorescent Labeling Reagents 2-羟色胺菊酯和1-甲酰基-2-羟色胺菊酯作为荧光金属离子传感器和近红外荧光标记试剂
Pub Date : 2018-04-01 DOI: 10.14723/TMRSJ.43.109
J. Kawakami, Y. Kinami, Masahiro Takahashi, S. Ito
140190C. As can be seen, the leakage current density for all samples is less than 110-5 A/cm2 under an applied field of up to 150 kV/cm, indicating excellent electrical insulation properties. Furthermore, the point at which electrical breakdown occurs shifts to lower electric field as the reaction temperature decreases from 140 to 160°C. The samples produced at 180 and 190°C exhibited strong electrical insulation properties even under a high applied field of up to 300 kV/cm. Figure 7 shows room-temperature P–E hysteresis loops for a sample with a CFO layer synthesized at 180C, and a sample with no CFO layer. Both samples exhibit good hysteresis loop shapes with excellent symmetry. The values of 2Pr (6365 C/cm2) and the coercive field (2Ec: 443445 kV/cm) are the same for both samples within the experimental error. This demonstrates that the nonaqueous sol-gel process is an effective method for introducing fine ferromagnetic particles into the nanospaces between the ferroelectric plates without degrading their electrical properties. The dependence of the room-temperature 2Pr and 2Ec values on the CFO synthesis temperature is shown in Fig. 7(c). 2Pr and 2Ec are seen to be almost constant at 5867 C/cm2 and 421462 kV/cm, respectively, regardless of the reaction temperature. In particular, the 2Pr values are comparable to that for Pb(Zr,Ti)O3, which is currently used in ferroelectric non-volatile memory applications, indicating that the performance level is practical. It can therefore be concluded that the optimal reaction temperature for depositing fine CFO particles on BNEuT/Nb:TiO2 substrates by the non-aqueous sol-gel process is 180°C, from the viewpoints of the structural, magnetization magnetic field, ferroelectric, and leakage current characteristics. 4. CONCLUSION Ferromagnetic CFO thin films were synthesized on (Bi3.25Nd0.65Eu0.10)Ti3O12/Nb:TiO2 substrates at reaction temperatures of 140190C using a non-aqueous sol-gel process. The magnetic properties of the films were measured, and the sample synthesized at 180C was found to exhibit the highest residual magnetization and coercivity of 1.5 emu/g and 134 Oe, respectively. The ferroelectric properties of all samples were similar, with a large remanent polarization of 5867 C/cm2 and a coercive field of 421462 kV/cm, regardless of the reaction temperature. Based on its magnetic and ferroelectric properties, it can be concluded that the sample synthesized at 180C has potential as a practical multiferroic material.
140年190C。可以看出,在高达150 kV/cm的电场作用下,所有样品的泄漏电流密度均小于110-5 A/cm2,具有优异的电绝缘性能。此外,当反应温度从140°C降低到160°C时,发生电击穿的点向较低的电场移动。在180°C和190°C下产生的样品即使在高达300 kV/cm的高电场下也表现出很强的电绝缘性能。图7显示了在180℃合成CFO层的样品和没有CFO层的样品的室温P-E磁滞回线。两种样品均表现出良好的磁滞回线形状和良好的对称性。在实验误差范围内,两种样品的2Pr值(63±65C/cm2)和矫顽力场值(2Ec: 443±445 kV/cm)相同。这表明,非水溶胶-凝胶工艺是一种有效的方法,可以在不降低铁电板电性能的情况下将铁磁微粒引入铁电板之间的纳米空间。室温2Pr和2Ec值对CFO合成温度的依赖关系如图7(c)所示。无论反应温度如何,2Pr和2Ec几乎都是恒定的,分别为58℃67C/cm2和421℃462 kV/cm。特别是,2Pr值与目前用于铁电非易失性存储器应用的Pb(Zr,Ti)O3相当,表明性能水平是实用的。综上所述,从结构、磁化、磁场、铁电特性和漏电流特性等方面考虑,非水溶胶-凝胶法在BNEuT/Nb:TiO2衬底上沉积精细CFO颗粒的最佳反应温度为180℃。4. 结论采用非水溶胶-凝胶法在(Bi3.25Nd0.65Eu0.10)Ti3O12/Nb:TiO2底物上合成了铁磁性CFO薄膜,反应温度为140℃~ 190℃。测定了膜的磁性能,发现在180℃下合成的样品具有最高的残余磁化强度和矫顽力,分别为1.5 emu/g和134 Oe。所有样品的铁电性能相似,无论反应温度如何,残余极化均为58 67C/cm2,矫顽力场为421 462 kV/cm。根据其磁性和铁电性能,可以得出结论,在180°C下合成的样品具有作为实用的多铁性材料的潜力。
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引用次数: 5
In situ Observation of 15 mol% Ba-Substituted Strontium Tantalate up to 1773 K by Ultraviolet Laser Raman Spectroscopy 紫外激光拉曼光谱法对15mol % ba取代钽酸锶1773 K的原位观察
Pub Date : 2018-02-01 DOI: 10.14723/TMRSJ.43.7
H. Fujimori, Ippei Kawanishi, N. Matsushita
Raman spectra of 15 mol% Ba-substituted Sr2Ta2O7 have been successfully obtained at temperatures up to 1773 K by a continuous-wave ultraviolet Raman spectroscopic system. The Raman spectra do not change significantly with an increase in temperature, despite the P21  Cmcm transition. The present result is described in terms of the parameter related to temperature variation at constant pressure, defined in a similar way to the Gruneisen parameter. Raman bands located above 220 cm show smaller values of the parameter than lower frequency modes, suggesting that these higher frequency modes are assigned to TaO6 internal modes. Due to the strong Ta—O chemical bonds, the dipole moments in the TaO6 octahedra and the ferroelectric polarization in the whole crystal lattice can be induced by the Ba substitution without large deviation of the Ta—O—Ta bond angles from 180, which enhances the photocatalytic performance.
用连续波紫外拉曼光谱系统成功地获得了15mol % ba取代的Sr2Ta2O7在1773 K温度下的拉曼光谱。尽管发生了P21Cmcm跃迁,但拉曼光谱并没有随着温度的升高而发生显著变化。目前的结果是用恒压下与温度变化有关的参数来描述的,其定义方式与格鲁尼森参数类似。位于220 cm以上的拉曼波段的参数值小于低频模式,表明这些高频模式被分配给了TaO6内部模式。由于Ta-O化学键较强,Ba取代可以诱导陶6八面体中的偶极矩和整个晶格中的铁电极化,而Ta-O - ta键角在180度范围内不会有较大偏差,从而提高了光催化性能。
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引用次数: 2
Preparations and Characterizations of Carboxymetylated Hydrophilic Macromolecular Composites Directly Derived from Weeds 直接从杂草中提取的羧甲基化亲水性高分子复合材料的制备与表征
Pub Date : 2018-02-01 DOI: 10.14723/TMRSJ.43.31
Mitsuru Aoyagi, Kento Maesono
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引用次数: 0
Preparation of metal doped SiO2 films by magnetron sputtering deposition using metal oxide mixture powder target 金属氧化物混合粉末靶磁控溅射制备金属掺杂SiO2薄膜
Pub Date : 2018-02-01 DOI: 10.14723/TMRSJ.43.27
Hiroharu Kawasaki, T. Ohshima, Y. Yagyu, T. Ihara, M. Shinohara, Y. Suda
Direct carboxymethylations for aliphatic hydroxyl groups in weeds such as Tall fescue (Festuca arundinacea, TF), Sweeping lovegrass (Eragrostis curvula, SL) and Canada goldenrod (Solidago Canadensis, CG) were carried out in 2-propanol / 30 % NaOH at 55 oC for 3.5 hrs. Under the typical conditions, carboxyletylated TF (TF-CM), SL-CM and CG-CM were obtained at yields of 145%, 135% and 148% based on each dry weight of lignocellulosics, respectively. Although degrees of substitutions of these CM materials were only small values such as 0.08-0.11, almost all materials were easily dissolved into water. Structural features were investigated using FT-IR and UV-Vis. Visocosities of 1% (w/w) aqueous solutions or suspensions of CM derivatives were measured by vibrating viscometer under different temperatures and pH. Since there are differences on viscosities between TF and CG in spite of same degrees of substitution, properties were different due to different structures of plant tissues.
在2-丙醇/ 30% NaOH条件下,55℃下,对高羊茅(Festuca arundinacea, TF)、黄草(Eragrostis curvula, SL)和加拿大黄花(Solidago Canadensis, CG)等杂草的脂肪羟基进行了直接羧甲基化。在典型条件下,羧基化TF (TF- cm)、SL-CM和CG-CM的产率分别为145%、135%和148%(按木质纤维素的每干重计算)。虽然这些CM材料的取代度只有0.08-0.11这样的小数值,但几乎所有的材料都很容易溶于水。利用FT-IR和UV-Vis研究了其结构特征。用振动粘度计测定了CM衍生物的1% (w/w)水溶液或悬浮液在不同温度和ph下的粘度。由于在相同取代度的情况下,TF和CG的粘度存在差异,因此由于植物组织结构的不同,其性质也不同。
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引用次数: 8
Thermoelectric properties of olivine-type sulfides Tm2XS4 (Tm = Mn, Fe, X = Si, Ge) 橄榄石型硫化物Tm2XS4 (Tm = Mn, Fe, X = Si, Ge)的热电性质
Pub Date : 2018-02-01 DOI: 10.14723/TMRSJ.43.13
H. Nagai, K. Hayashi, Y. Miyazaki
Polycrystalline olivine-type sulfides, Mn2SiS4, Mn2GeS4, Fe2SiS4, and Fe2GeS4, are prepared by solid-state reactions and spark plasma sintering. Among these sulfides, only the electrical conductivities and Seebeck coefficients of Fe2SiS4 and Fe2GeS4 are measurable, owing to their narrower energy gaps compared with those of Mn2SiS4 and Mn2GeS4. Although Fe2SiS4 and Fe2GeS4 exhibit low electrical conductivities, their Seebeck coefficients and thermal conductivities are relatively high and low, respectively, demonstrating their potential as good thermoelectric materials. The highest zT value, 0.008, is obtained for Fe2GeS4 at 700 K, which can be enhanced by hole carrier doping and heavy elemental partial substitution.
采用固相反应和火花等离子烧结法制备了多晶橄榄石型硫化物Mn2SiS4、Mn2GeS4、Fe2SiS4和Fe2GeS4。在这些硫化物中,只有Fe2SiS4和Fe2GeS4的电导率和塞贝克系数是可测量的,因为它们的能隙比Mn2SiS4和Mn2GeS4更窄。虽然Fe2SiS4和Fe2GeS4表现出较低的电导率,但它们的塞贝克系数和热导率分别相对较高和较低,显示出它们作为良好热电材料的潜力。Fe2GeS4在700 K时zT值最高,为0.008,通过空穴载流子掺杂和重元素部分取代可以提高zT值。
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引用次数: 3
The structure and microwave dielectric properties of Li2MoO4-SiO2 ceramics without addition of glass as sintering aids 不添加玻璃助剂的Li2MoO4-SiO2陶瓷的结构和微波介电性能
Pub Date : 2018-02-01 DOI: 10.14723/TMRSJ.43.1
Yuanming Lai, Xiaoli Tang, Huaiwu Zhang, Xiaofeng Liang, Xin Huang, Jie Li, Hua Su
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引用次数: 1
Fabrication and Output Power Characteristics of a Pulley-type SMA Heat-engine Including the Idler Wheel with a Cooling System 带冷却系统的滚轮式SMA热机的制造及输出功率特性
Pub Date : 2018-01-01 DOI: 10.14723/TMRSJ.43.23
T. Akagi, Chikara Nakagawa, Y. Takeda, Hiroki Cho
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引用次数: 0
Effects of heating/cooling-water temperatures on output power characteristics of forced cooling pulley-type SMA heat-engine 加热/冷却水温度对强制冷却皮带轮式SMA热机输出功率特性的影响
Pub Date : 2018-01-01 DOI: 10.14723/TMRSJ.43.81
T. Tsuda, Chikara Nakagawa, Y. Takeda, Hiroki Cho
In this research, the effects of heating/cooling water temperatures of a heat engine on the output characteristics of the forced cooling pulley-type SMA heat-engine is investigated for the purpose of operating temperature optimization of the engine. The engine output increases almost linearly as the heating water temperature (TH) rises. On the other hand, the engine output shows a gradual decrease as the temperature of SMA element during cooling (TSMA) rises to 321.4 K and then an abrupt decrease when the TSMA = 322.7 K. Thermal cycling tests under constrained strain conditions for the SMA element were carried out to investigate the effect of heating/cooling temperatures to generation stress () and reaction velocity (VR) of the SMA element. In result,  increases gradually with the increase of TH. Besides, VR increases almost linearly as TH increases. This result suggests that the increase of engine output as TH increases is mainly due to the increase of the VR. Meanwhile, VR increases gradually with the increase of TSMA. Besides,  increases as TSMA rise up to 318 K, above which it decreases rapidly. From these results, it may be concluded that the contributing factor to the engine output is the variation of  and VR with the variation of TSMA.
本文研究了热机加热/冷却水温度对强制冷却皮带轮式SMA热机输出特性的影响,以优化热机的工作温度。随着加热水温(TH)的升高,发动机输出几乎呈线性增加。另一方面,当SMA元件冷却温度(TSMA)上升到321.4 K时,发动机输出功率逐渐下降,当TSMA = 322.7 K时,发动机输出功率突然下降。在约束应变条件下对SMA构件进行了热循环试验,研究了加热/冷却温度对SMA构件产生应力()和反应速度(VR)的影响。结果表明,随着TH的增加,的压力逐渐增大。此外,随着TH的增加,VR几乎呈线性增加。这一结果表明,随着TH的增加,发动机输出功率的增加主要是由于VR的增加。同时,随着TSMA的增加,VR逐渐增大。当TSMA升高至318k时,的负荷增加,高于318k时负荷迅速下降。从这些结果可以得出结论,影响发动机输出的因素是的变化和VR随TSMA的变化。
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引用次数: 1
期刊
Transactions-Materials Research Society of Japan
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