Materials Literature
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Several types of Si-based ceramic fibers have been prepared using an organic-to-inorganic conversion process. In this article, the preparation, microstructure, and high-temperature stability of SiC-based ceramic fibers prepared from polycarbosilane of an organosilicon polymer are reviewed. The first fiber produced was…
Using the porosity of a binary exotemplate, with mesoporous core-shell structure (SiO2@ZrO2), opens a new pathway to produce hybrid core-shell spheres, composite hollow spheres, and porous hollow spheres -- all monodisperse in size.
We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 µm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye in 1947. However, while their experiments with two-dimensional bubble rafts have stimulated many rese…
High-speed impact dynamics is of interest in the fundamental sciences, e.g., astrophysics and space sciences, and has a number of important applications in military technologies, homeland security and
We demonstrate experimentally the double-negative (epsilon < 0, micro < 0) transmission band of a one-dimensional metamaterial structure under normal-to-plane propagation in the microwave regime. The structure consists of stacked bilayers of metal cutwire and wire pairs, which are separated by a thin dielectric layer.…
This issue of Journal of Materials Chemistry highlights recent research progress in synthesis, processing and characterization of novel porous materials for emerging applications. (George) X. S. Zhao, the Guest Editor, briefs the issue and provides an overview of the field.
Peptide-amphiphiles, peptides to which a non-peptidic hydrophobic moiety has been added to the N or C terminal end, have been demonstrated to be a versatile method for simultaneously controlling nanostructure and chemical functionality. These amphiphiles are able to self-assemble, in a controlled fashion, into nanofib…
This paper reviews and briefly describes the milestones of the research on left-handed metamaterials since 2001, from their discrete implementation as a succession of rings and rods, to their characterization as effective media with frequency dispersive constitutive parameters. We then pursue on discussing some of the…
We present a detailed study of photophysical properties of single color centers in natural diamond samples emitting in the near infrared under optical excitation. Photoluminescence of these single emitters has several striking features, including narrow-band (FWHM 2 nm) fully polarized emission around 780 nm, a short…
By means of variable-temperature FTIR spectroscopy, the standard adsorption enthalpy of hydrogen on the zeolite (Mg,Na)-Y was found to be ΔH° = −17.5 kJ mol−1, which suggests that magnesium-containing porous materials are good candidates in the search for suitable adsorbents for reversible hydrogen storage.
Terapijski sustavi koji bi omogucili kontrolirano oslobađanje lijeka u debelom crijevu od velikog su znacaja u lokalnoj terapiji bolesti kolona kao sto su Crohnova bolest, ulcerozni kolitis, karcinom kolona i rektuma, infektivna oboljenja, amebijaza i sl.. Ciljano djelovanje lijeka kontroliranim oslobađanjem u kolonu…
Abstract This paper is a summary of the research progress made by the author in the study of non-eguilibrium grain-boundary segregation and intergranular embrittlement during the last 20 years.Some new concepts and new models in this research field are proposed, and their scientific are introduced. Supported by the Na…
The interaction of dimethyl sulfoxide with N-methylmorpholine-N-oxide (NMMO) monohydrate was studied by the NMR relaxation method. The mobility of DMSO molecules in the presence of NMMO monohydrate decreases due to the formation of a hydrogen bond between the water molecule of the monohydrate and a DMSO molecule. At t…
Piperidinium nitrate was studied by FTIR and FT Raman spectroscopy in the range 100-4000 cm -1 at 300 K. On the basis of DSC measurements which exhibit two effects indicating phase transition at 256 and 295 K, FTIR spectra were recorded down to a temperature of 90 K. Discussion of the phase transition mechanism is bas…
数字编织纺织品是数字纺织品的最近的研究区域之一。关于数字编织织物的设计的研究的钥匙躺在结构的设计。现在，数字设计技术的申请根本上改变了编织织物的结构的设计的概念，产生被认为的设计方法和效果不可能以前。研究被执行了分析编织结构的性质和结构的设计的方法。这篇论文建议在数字设计概念，数字范围的设计在上穿行和编织数据库的建立下面的结构的设计的一个创新原则和方法被介绍满足平衡交叉的要求。这研究的结果将在数字编织织物的创造提高未来研究，这被想象，与数字花布织机的织物上的特别强调。同时，这研究也被生为编织纺织品的聪明的设计的基础。
This review summarises developments in the photophysical properties of molecular metal complexes and their polynuclear and supramolecular assemblies for 2005. The huge increase in the popularity of this field (291 references included this year, compared to 145 last year) means that only the major high-impact journals…
New motifs for the supramolecular assembly of crystalline porphyrin network solids directed by charged N–H⋯Cl and N–H⋯O hydrogen bonds are presented, using the tetra(4-pyridyl)- and tetra(4-carboxyphenyl)-porphyrin building blocks.
A homologous series of the new N-heterotolane was synthesized using two cross-coupling reactions mediated by copper and palladium/copper. The final compounds present a naphthyl-pyridyl framework connected by an acetylene group. The evaluation of physico-chemical properties is described. All the compounds exhibit the s…
In order to study the effect of different vulcanization systems on the properties of high-vinyl solution styrene butadiene rubber(HVSSBR),the HVSSBR is cured with equilibrium cure(EC),conventional vulcanization(CV),semi-efficient vulcanization(SEV) and efficient vulcanization(EV) systems.The HVSSBR cured with EC has b…
This paper offers a new method of measuring short fiber content of cotton fibers. The method is composed of two parts: one is Hertel sampling and the other is image testing. With the help of fiber mixer, a thin and even cotton net is obtained on which we can get Hertel sample by using a sliver clamp. The near micro op…