Materials Literature
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Surface chemistry plays an important role in numerous technological innovations, and gives the ability to modify and control surface and interface properties. Layer-by-Layer (LbL) self-assembly is a simple concept that can provide a route to versatile combination of materials as well as fine control of film thickness,…
以甲酸乙酯和水合肼为原料，历经氨解、成环两步反应得到4-胺基-1，2，4-三唑（AT）；然后，以乙醇为溶剂，AT与高氯酸铜发生络合反应，得到4-胺基-1，2，4-三唑高氯酸铜配合物（ATCP）。采用有机元素分析、x射线荧光光谱和FTIR，对其进行了表征。利用TG／DTG、DSC研究了ATCP的热分解行为，其最终分解产物为CuO.利用浇注工艺制备了含ATCP的改性双基推进剂样品，研究了ATCP对推进剂燃烧性能的影响。结果表明，ATCP对改性双基系推进剂的燃烧具有良好的催化作用，是-种高效的燃烧催化剂。
文章比较了Co3O4/GO及Mn3O4/GO种催化剂催化0xone对N0x氧化效果的影响，考察了pH．0xone投加量及温度等因素对催化0xone氧化N0x效果的影响。研究结果表明：在相同的试验情况下，Co3O4/GO催化0xone氧化N0x的效果要优于Mn3O4/GO
BevezetésA réteges kettős hidroxidokat (layered double hydroxide -LDH), mivel anioncserére képesek, nem teljesen helyesen, gyakran hívják anionos rétegszilikátoknak a kationcserélő rétegszilikátok analógiájára.1 Bár természetes eredetű LDHk is vannak, 2,3 ha kémiai alkalmazás a cél, akkor rendszerint mesterséges úton…
固定增容剂马来酸酐接枝聚丙烯（PP-g-MA）的含量为10％，采用熔融共混制备出聚丙烯（PP）／PP—g—MA／蒙脱土（MMT）纳米复合材料，并研究了不同含量MMT对复合材料的力学性能、球晶大小和SEM形貌等的影响。结果表明，当MMT质量分数为3％、PP-g-MA质量分数为10％时，PP／PP—g-MA／MMT纳米复合材料中MMT的分散性较好，冲击强度达到4．2kJ／m2，比纯PP提高了45％，而拉伸强度降低不明显。
采用直接反应烧结法制备了（Ba1-x Cax ）（Ti0．85 Zr0．15）O 3无铅压电陶瓷,分析了不同的 Ca 含量时陶瓷的晶相结构、微观结构、密度及电性能.结果表明,采用直接反应烧结法制备的（Ba1-x Cax ）（Ti0．85 Zr0．15）O3无铅压电陶瓷具有纯的钙钛矿相结构；微观结构致密,晶粒大小比较均匀,陶瓷样品出现较大的直径收缩率（25％左右）；随着 Ca 含量的增加陶瓷的居里温度略微降低,室温介电常数出现较大增加,压电常数变大,其中 x ＝0．15时压电性能最好,d 33为208 pC/N.
The phase equilibria in the Cu-Tl-Se system have been investigated in CuTlSe-Se and CuTlSe-TlSe sections by the X-ray powder diffraction and differential thermal analyses, as well as the EMF measurements with the Cu4RbCl3I2 solid electrolyte applied to equilibrated alloys. It is shown that both sections are quasi-bina…
DNA has served as an excellent building block to self-assemble into a wide range of one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) structures with the bottom-up method. Due to the specificity of base pairing, the DNA assembly system is predictable and robust. These DNA structures with higher div…
In 1996, White light emitting diode (WLED) was fabricated by using the blue LED chip and yellow emitting phosphor such as cerium doped yttrium aluminum garnet (YAG:Ce3+) by Nichia, and further developed the major market age. Although the WLED has high brightness and efficiency, it still has some problems such as color…
Low temperature combustion (LTC) modes of operating internal combustion engines are of great interest for their potential to achieve high thermal efficiencies while maintaining low nitrogen oxide (NOX) and particulate matter emissions below levels requiring costly after-treatment systems. While various strategies for…
考察钨源（磷钨酸和偏钨酸铵）和浸渍方法（共浸渍和分步浸渍）对以 MCM-41为载体的 NiW 基催化剂的物化性质及催化喹啉加氢脱氮反应的影响，并通过 XRD、FT-IR、UV-DRS、XPS 和 Py-IR 等表征手段对样品进行了表征。结果表明：以偏钨酸铵为钨源采用共浸渍法制备的催化剂具有最高的加氢脱氮活性。该催化剂钨物种的分散度最高，表面酸量及活性物种前体最多。
Single-layer graphene exhibits remarkable electronic and thermal properties and it is the strongest material known, thus it offers great promise for a broad range of nanotechnological applications. Despite the exceptional properties exhibited by pristine graphene monolayers, harnessing the mechanical performance of si…
The influence of the gap on the absorption performance of the conventional split ring resonator （SRR） absorber is investigated at microwave frequencies. Our simulated results reveal that the geometry of the square SRR can be equivalent to a Jerusalem cross （JC） resonator and its corresponding metamaterial absorber （MA…
In this paper we made an attempt to introduce the theory of nonlinear creep of soil compaction for a bounded domain. Here with this is considered only so-called physically nonlinear creep theory, in the construction of which, the constitutive relation is replaced by a nonlinear law, preserving the geometric lineariz…
在前期理论研究的基础上，进一步采用密度泛函理论（DFT）中的O3LYP方法，研究了具有不同数目的中心质子对α-[HxW12O40]（8-x）-（x=1～4）的几何结构和电子结构的影响。在LanL2DZ基组水平下，优化得到了各物种的稳定构型，并对优化好的构型作了NBO计算分析。研究发现，Keggin金属氧笼内质子的进入，对标题化合物的中心结构产生了较大影响，这些中心质子不仅被Keggin的金属氧笼“包合”，而且与Keggin的4个中心氧之间构成了不同类型的四面体结构，同时还形成了强弱和取向不同的“笼内氢键”，这些氢键受到Keggin金属氧笼（直径约7A）的“束缚”而成为“笼内约束氢键”。基于键价（BV）模型，对这些特殊的分子内氢键进…
以双酚A、苯胺、多聚甲醛为原料，合成了双酚A-双苯并噁嗪（DBOZ），再用其与DOPO（9，10-二氢-9-氧杂。10-磷杂菲-10-氧化物）反应，合成了含DOPO的双酚A-单苯并噁嗪（DBDO）。采用红外、核磁共振（氢谱核磁共振和碳谱核磁共振）等分析手段对DBOZ和DBDO的化学结构进行了表征；采用差示扫描量热仪对DBOZ和DBDO的固化特性进行研究，使用热重分析分析了所得聚苯并嘿嗪的热稳定性。结果表明：在N2气氛中，DBOZ在205℃左右开环聚合，热分解温度为312℃，在373℃分解速度达到最快，在800~C时的残碳率为37．19％；在N2气氛中，DBDO的热分解温度为353℃，在443℃分解速度达到最快，在800℃时的残碳率…
Description of switching processes in crystalline ferroelectrics by means of relaxation type equations with account of variable external electric field influence is proposed. The exact analytical solutions of these equations at arbitrary dependence of relaxation function on electric field and its derivative are obtain…
合成了基于二氰基亚甲基-四氢吡喃和苯并噻二唑的新型荧光化合物,并研究了该化合物通过改变二价铜离子和氟离子/溴离子滴加顺序对应的分子荧光现象。研究发现先加入二价铜离子导致该化合物的最大发射波长＂蓝移＂,继续滴加氟离子导致荧光淬灭,若继续滴加的是溴离子则荧光不变;反之先加入氟离子,该化合物荧光强度微弱降低,继续滴加铜离子对荧光强度影响不大,若滴加溴离子,该化合物荧光不变,继续滴加铜离子,最大发射波长强度降低,并且在485nm处出现新的荧光;这些荧光变化的机制也得到研究与证实。分子逻辑门是在分子水平上的逻辑操作来描述逻辑门,输入和输出信号。通过改变离子性质（加入氟离子或溴离子）、滴加顺序、激发波长获得不同的荧光发射波长和荧光强度,模拟了…
Single-walled carbon nanotubes are poised to replace silicon in high-performance microprocessor chips and are expected to offer a significant improvement in energy-delay product. However, one key challenge of realizing such a technology is to produce semiconducting nanotube arrays with both minuscule and uniform inter…
With an increasing demand for renewable energy sources, research efforts on different solar cell technologies are increasing rapidly. The dye-sensitized solar cell (DSC) is one such technology, taking advantage of light absorption in dye molecules. The liquid based DSC contains several interesting and important interf…