Materials Literature
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An analysis of the microwave absorbing properties of several polymer-(epoxy) based nanocomposites is presented. The nanoparticles of interest for this study were cobalt ferrite nanoparticles. For better dispersion of the nanoparticles in the polymer matrix surface treatment of the nanoparticles with silane compounds w…
在添加一定浓度的CuX (X=Cl/Br)/五甲基二亚乙基三胺(PMDETA)后，甲基丙烯酸N，N-二甲氨基乙酯（DMAEMA）于室温下只需暴露于空气中即可聚合形成PDMAEMA.通过一系列对比试验验证了该过程的催化氧化聚合特征，通过改变催化剂浓度与反应温度等反应条件，利用气相色谱、核磁共振和凝胶渗透色谱研究了该聚合过程的动力学和所得PDMAEMA的结构.结果表明，单体转化率与所得聚合物分子量均随反应时间的延长而逐渐增加，过高或者过低浓度的CuX/PMDETA均无法催化该聚合过程，所得聚合物具有与普通线型PDMAEMA类似的化学结构.我们提出了一个假设性的机理以解释此现象.
Abstract Hydrogen passivated nanocrystalline Si/SiO2 (nc‐Si:H/SiO2) pillar arrays were fabricated by using nanosphere lithography combination with hydrogen plasma annealing (HPA). Enhanced blue‐orange‐red photoluminescence (PL) could be observed by the naked eye in the bright room from the samples. By controlling the…
Materials with an internal mechanism for damage repair would be valuable in isolated environments where access is difficult or impossible. Current work is focused on characterizing neat polymers with reformable cross-linking bonds. These bonds are thermally reversible, the result of a Diels-Alder cycloaddition between…
Capítulo 1: Introdução são individualmente manipulados para construir sistemas nanoestruturados mais complexos.Estes MBBs, por possuírem dimensões de alguns nanometros, conferem, às nanoestruturas, novas propriedades e características até então inexistentes em materiais e dispositivos convencionais.Por exemplo, cerâmi…
(153.) A lthough the cost of any article may be reduced in its ultimate analysis to the quantity of labour by which it was produced; yet it is usual, in a certain state of the manufacture of most substances, to call them by the term raw material. Thus iron, when reduced from the ore and rendered malleable, is in a sta…
Polycrystalline NdFeAsO0.88F0.12 superconductors prepared by high pressure (HP) and ambient pressure (AP) method were comparatively studied by magnetization and transport measurements. Upper critical field (Hc2), irreversibility field (Hirr) and the anisotropy parameter were estimated from resistance transition curves…
1. S oap as a L ithographic M aterial .—Soap consists of an alkali in combination with a fatty acid. The alkalies used in soap-manufacture are soda, potash, and ammonia; the acids are chiefly oleic, stearic, palmitic, and margaric. Soda forms the “hard” soap; potash the “sweet” or soft soap; and ammonia the kind of so…
(54.) T he precision with which all operations by machinery are executed, and the exact similarity of the articles thus made, produce a degree of economy in the consumption of the raw material which is in some cases of great importance. The earliest mode of cutting the trunks of a tree into planks, was by the use of t…
Στο Κεφάλαιο 1 γίνεται μια εισαγωγή στις Αρχές του Ηλεκτρομαγνητισμού, οι οποίες είναι και η βάση στην οποία στηρίζεται η λειτουργία του μετασχηματιστή. Αναλύεται ο τρόπος δημιουργίας του μαγνητικού πεδίου ενώ παρουσιάζονται συνοπτικά όλα εκείνα τα μαγνητικά μεγέθη τα οποία θα μας χρησιμεύσουν στην συνέχεια της διπλωμ…
La crescente domanda di sistemi miniaturizzati per la conversione e stoccaggio dell'energia ha spinto un'ampia ricerca finalizzata alla fabbricazione di dispositivi ionici a stato solido sotto forma di film sottile. Vale a dire, negli ultimi anni molti ricercatori stanno lavorando per realizzare le celle a combustibil…
We have synthesized the novel material Na_2IrO_3 and studied its structure, transport, magnetic, and thermal properties using powder x-ray diffraction (PXRD), electrical resistivity, isothermal magnetization M versus magnetic field H, static χand dynamic χ_ac magnetic susceptibility versus temperature T, and heat capa…
We have developed methods for the pharmaceutical analysis of a new antiarrhythmic drug cardiocyclide in solid dosage form (capsules). The main pharmacopoeial tests were carried out and the content of impurities in capsules was determined by thin-layer chromatography. Ultraviolet spectrophotometry and gradient high-per…
在不同表面活性剂辅助的水热条件下合成出纺锤形、花束状、纳米束和削角八面体形的YF3：Eu3＋纳米发光材料,对其结构和性能进行了表征.XRD分析表明：样品为结晶良好的正交相YF3.由FESEM与TEM照片可见,不同表面活性剂的条件下,所合成样品的形貌不同.SEAD显示所得样品分别为多晶和单晶结构,EDX显示所得样品中含有F,Y和Eu三种元素.荧光光谱表明：YF3：Eu3＋纳米晶的最强发射峰位于591nm,对应Eu3＋的5D0→7F1的磁偶极跃迁发射,说明Eu3＋占据YF3基质中Y3＋晶格点的C2对称格位上.不同形貌样品的荧光光谱强度不同.
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Η παρούσα διπλωματική εργασία εκπονήθηκε στο τμήμα Ηλεκτρολόγων Μηχανικών και Τεχνολογίας υπολογιστών του πανεπιστημίου Πατρών και το θέμα της αφορά τη μελέτη σφαλμάτων στο δρομέα τριφασικής σύγχρονης μηχανής έκτυπων πόλων με τη δημιουργία δισδιάστατου μοντέλου πεπερασμένων στοιχείων. Σκοπός της διπλωματικής εργασίας…
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Designing new materials with improved or tailored properties is one of the main goals of the chemists. Two common ways are mainly used to get a material with improved or new properties: blending or chemical synthesis. Chemical synthesis is an unlimited method to get new substances with well-defined properties even it…
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A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.