Materials Literature
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The novel phosphor K 2 Y 2 B 2 O 7 doped with europium is studied for its photoluminescence properties. The studies show that the phosphor gives strong red emission (PL) at 613 nm related to 5 D 0 - 7 F 2 transition of Eu 3+ under the 260 nm excitation (PLE) related to the charge transfer (CT) from the 2p orbital of t…
α-graphdiyne is a novel predicted Dirac cone material, which is similar to graphene. But the absence of a band gap significantly limits its practical applications. In order to extend this limitation, an opening of energy gap is needed. To this end, we resort to the nanoribbon structure of α-graphdiyne. This is a conve…
Our aim in this paper is to define dynamic boundary conditions for several sixth-order Cahn–Hilliard systems. We then study the well-posedness and the dissipativity of the systems derived. Copyright © 2014 John Wiley & Sons, Ltd.
Multilevel anisotropic diffractive optical elements (DOEs), in which digitized spatial patterns of optical birefringence are fabricated by means of stepping photoalignment technique, has been demonstrated using photo-cross-linkable polymer liquid crystals (PCLCs). The polarization state of incident light is converted…
Symmetry plays a fundamental role in chiral recognition and enantioselective catalysis. Porphyrins possess a number of structural features that make them attractive for the stereocontrol of chiral recognition and metal-catalyzed asymmetric reactions. This article is a brief account of our studies on chiral recognition…
NaNbO 3 has an antiferroelectric structure at room temperature and finds important technological applications. It exhibits an unusual complex sequence of temperature-and pressure-driven structural phase transitions. NaNbO 3 shows unambiguous evidence for the presence of the ferroelectric R 3 c phase coexisting with an…
The thermal properties of composites based on polycarbonate (PC) filed with ultraviolet/ozone (UVO) treated multiwall carbon nanotubes (MWCNTs) in low limit (less than 0.01) volume fractions have been investigated. The composites were prepared in the form of films of relatively small thickness (23–33 μm) with random o…
ABA형태의 삼중블록공중합체는 고무상과 유리상의 상대적 성분에 좌우되는 열가소성 탄성체와 강화 플라스틱으로써 유용하다. 이러한 물질은 다른 고분자와 혼합하여 첨가제, 강화제, 상용화제로써 기능성을 줄 수 있다. 상업적으로 유용한 대부분의 블록 공중합체는 석유로부터 유래된다. 지구상의 유한한 화석자원 공급과 석유 사용 및 채굴에 관련된 경제, 환경적 비용을 고려하면 그 대안은 매력적이다. 이러한 흐름에 더하여 미래 지속 가능한 물질의 최종 용도를 위한 설계 및 그 실행이 요구되고 있다. 본 총설에서는 재생 가능한 ABA 형태의 삼중블록 공중합체 합성과 특성을 살펴보고…
We use non-equilibrium molecular dynamics to study the heat transfer mechanism across sandwich interfacial structures of Si/n-atomic-layers/Si, with 1 ≤ n ≤ 20 and atomic layers composed of WSe2 and/or graphene. In the case of WSe2 sheets, we observe that the thermal resistance of the sandwich structure is increasing…
We explored tin (Sn) alloys (Cu-Sn, In-Sn, Pb-Sn) as possible candidates for negative electrode materials of magnesium ion secondary batteries. Cyclic voltammograms revealed that In-Sn, Pb-Sn, and elemental Sn are active against Mg insertion and desertion at room temperature in a Grignard reagent, while Cu-Sn intermet…
We have studied the Raman features characteristics of defects generated in graphite under high stress conditions. Defects are generated in pristine highly oriented pyrolytic graphite by squeezing the samples in a high‐pressure anvil cell and monitored in situ by Raman spectroscopy. On the basis of our Raman measuremen…
A new approach is presented for measuring the heat dissipation in power electronic devices using a commercial thermoelectric (TE) module as a heat flux sensor. The proposed sensor takes advantage of both the Seebeck and Peltier TE effects, yielding a new type of heat flux sensor with low thermal resistance and appeali…
ABSTRACT Thermoplastic composites based on a commercial acrylic matrix widely used in the field of art protection and restoration (Paraloid B72) and various concentrations (up to 30 wt %) of microcrystalline cellulose powder (MCC) were prepared by melt‐compounding and compression molding. The mechanical behavior of th…
ABSTRACT The objective of this work is to improve the properties of natural rubber composites (NRC) that were frequently used in medical and health supplies, using nanosilver additions. Silver nanocolloids were biosynthesized with an aqueous medium of aloe leaf extract (ALE) as capping agent, and then were filled in n…
Graphene/hexagonal boron nitride (h-BN) heterostructure has showed great potential to improve the performance of graphene device. We have established the cohesive law for interfaces between graphene and monolayer or multi-layer h-BN based on the van der Waals force. The cohesive energy and cohesive strength are given…
In the present article the authors make an attempt to survey briefly the main landmarks of the GBD, to set off the most interesting results of the last years, to underline some gaps between expected and observed experimental data and to direct possible ways of their explanation.
We report the possible sites that beryllium atoms can occupy in BeZnO alloy films by a comparative study. The epitaxial Be x Zn 1− x O ( x = 0, 0.06, 0.1, 1) films were prepared by a molecular beam epitaxy technique, and their structural properties were characterized with x-ray diffraction, Raman spectroscopy and x-ra…
Ammonium polyphosphate (APP) was synthesized by heating a mixture of phosphoric acid and urea, and APP/diatomite composite flameretardant fillers were prepared by two methods: mixing and in situ polymerization. Flame-retardant paper was made by adding the prepared composite fillers to paper. The APP and APP/diatomite…
Capillary forces are involved in a variety of natural phenomena, ranging from droplet breakup to the physics of clouds. The forces from surface tension can also be exploited in industrial applications provided the length scales involved are small enough. Recent experimental investigations showed how to take advantage…
W-doped Ge 2 Sb 2 Te 5 materials have been investigated for phase change memory applications. W 0.08 (Ge 2 Sb 2 Te 5 ) 0.92 phase change film exhibits a higher crystallization temperature (255 °C), better data retention of 10 years at 183 °C, and higher crystalline resistance compared with traditional Ge 2 Sb 2 Te 5 .…