Photoaddition von Vinylacetat an Benzol     

Andrew Gilbert  Mohd. Wahid bin Samsudin 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1975,87(15):540-541

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Daisuke Kosemura  Siti Norhidayah binti Che Mohd Yusoff  Atsushi Ogura 《Journal of Raman spectroscopy : JRS》2014,45(6):414-417

Electrical field components of metal‐surface plasmon resonance were analyzed in detail. Both longitudinal optical (LO) and transverse optical (TO) phonon modes of a biaxially strained Si layer can be excited by surface‐enhanced Raman spectroscopy (SERS). The z to y polarization ratio in SERS measurements was calculated to be 0.78 using the intensity ratio of TO to LO phonon modes. The electrical field components of SERS were also calculated by the finite‐difference time‐domain method. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

    

Dileep Kumar  Malik Abdul Rub  Mohd. Akram  Kabir‐ud‐Din 《Journal of Physical Organic Chemistry》2014,27(9):729-734

In the present paper, reaction of zinc‐glycylphenylalanine ([Zn(II)‐Gly‐Phe]⁺) with ninhydrin has been investigated in gemini (m‐s‐m type; m = 16, s = 4–6) surfactants at temperature (70 °C) and pH (5.0). Monitoring the appearance of product at 400 nm was used to follow the kinetics, spectrophotometrically. The order of the reaction with respect to [Zn(II)‐Gly‐Phe]⁺ was unity while with respect to [ninhydrin] was fractional. The reaction constants involved in the mechanism were obtained. In addition to the rate constant (k_Ψ) increase and leveling‐off regions are observed with the geminis, just like as seen with conventional surfactant hexadecyltrimethylammonium bromide (CTAB), the former produced a third region of increasing k_Ψ at higher concentrations. A close agreement between observed and calculated rate constants was found under varying experimental conditions. A suitable mechanism consistent with the experimental findings has been proposed. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

    

Naved Azum  Malik Abdul Rub  Abdullah M. Asiri  Mohd. Akram 《Russian Journal of Physical Chemistry B, Focus on Physics》2015,9(6):940-945

Aggregation behavior of cationic gemini (hexanediyl-1,5-bis(dimethylcettylammonium bromide) (16-5-16)) surfactant with conventional single chain surfactants cetyltrimethylammonium bromide (CTAB) and tetradecyltrimethylammonium bromide (TTAB) were studied with the help of fluorescence measurements. Fluorescence probe is a proficient technique for examining the surfactant-surfactant interaction and aggregation. The micelle aggregation number (N _agg) was measured using steady-state fluorescence quenching method. The micelle aggregation numbers of binary combinations fall between those of constituent surfactants. The micropolarity (I ₁/I ₃), binding constant (K _sv) and dielectric constant (D _exp) of mixed systems were determined from the ratio of peaks intensity in the pyrene fluorescence spectrum. The I ₁/I ₃ values were found to be more than >1, showing more polar environment around pyrene in the mixed micelle as compared to the pure micelles.  相似文献   

    

Yazid Yaakob  Yu Kuwataka  Mohd Zamri Mohd Yusop  Shihomi Tanaka  Mohamad Saufi Rosmi  Golap Kalita  Masaki Tanemura 《physica status solidi b》2015,252(6):1345-1349

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Hassan Jafari  Mohd Hasbullah Idris  Ali Ourdjini  Saeed Farahany  Mohammed Rafiq Abdul Kadir 《Particle & Particle Systems Characterization》2012,29(4):263-272

Oxidation and melting behaviors of AZ91D granules throughout the in‐situ melting process using flux were investigated. The granules were heated under unprotected environment at four different temperatures between 650 and 800 °C, for the durations of 30 and 60 min. The products of heating process were characterized macroscopically and the oxides formed on the granules were examined using field emission scanning electron microscope, energy dispersive X‐ray spectroscopy and X‐ray diffraction analysis. Thermal analysis was used to reveal the response of the granules to heating during the in‐situ melting. The results showed that the granules experienced severe oxidation even in the presence of the flux, and significant amount of them changed to a powdered state due to oxidation and combustion, especially at 800 °C. It was discovered that the granules melted during heating; however, oxides formed on their surface encapsulated the molten metal and prevented the liquids from merging. The results also revealed that increasing heating temperature and time enhanced mold‐magnesium reaction resulted in the entrance of mold materials into the oxidation residues.  相似文献   

    

Mohamad Kamarol Mohd Jamil  Shinya Ohtsuka  Masayuki Hikita  Hitoshi Saitoh  Masayuki Sakaki 《Journal of Electrostatics》2011,69(6):611-617

This paper presents the decomposition by-products of trifluro-iodo-methane and their relative proportions in the gas phase under the occurrence of partial discharge. The experiment was performed in the presence of water vapor from 250 to 400 ppm under a non-uniform electric field configuration. The experimental results reveal that the by-products of C₂F₆, C₂F₄, C₂F₅I with the amount of 1300, 200, and 55 (CH₃I) ppm, respectively, were produced for a cumulative charge of 161 mC. Other by-products, such as C₃F₈, CHF₃, C₃F₆ CH₃I were obtained at less than 30 ppm C₂F₆ was the dominant gas by-product of trifluro-iodo-methane suffering partial discharge.  相似文献   

    

Debasish Ghosh  Pradip Ghosh  Mohd Zamri Yusop  Masaki Tanemura  Yasuhiko Hayashi  Tetsuo Tsuchiya  Tomohiko Nakajima 《固体物理学:研究快报》2012,6(7):303-305

A fully transparent and flexible field emission device (FED) has been demonstrated. Single‐walled carbon nanotubes (SWCNTs) coated on arylite substrate were used as electron emitters for the FED and a novel metavanadate phosphor coated on the SWCNTs/arylite film was used as transparent and flexible screen. The SWCNTs/arylite based emitters and the SWCNTs/arylite/metal‐vanadate‐based phosphor showed a transmittance value of 92.6% and 54%, respectively. The assembled device also showed satisfactory transparency and flexibility as well as producing significant current. Metavanadate phosphor is considered to be an excellent candidate due to its superior luminescence properties and easy fabrication onto transparent and flexible conductive substrate at room temperature while retaining reasonable transparency of the substrate. Thus, its transparency and flexibility will open the door to next‐generation FEDs. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

    

Sharul Ashikin Kamaruddin  Mohd Zainizan Sahdan  Kah‐Yoong Chan  Mohamad Rusop  Hashim Saim 《physica status solidi (a)》2010,207(7):1596-1599

Zinc oxide (ZnO) is an emerging material in large area electronic applications such as thin‐film solar cells and transistors. We report on the fabrication and characterization of ZnO nanostructures. ZnO nanostructures have been synthesized using sol–gel immerse technique on oxidized silicon substrates. Different precursor's concentrations ranging from 0.0001 to 0.01 M using zinc nitrate hexahydrate [Zn(NO₃)₂.6H₂O] and hexamethylenetetramine [C₆H₁₂N₄] has been employed in the synthesis of ZnO nanostructures. The surface morphologies were examined using scanning electron microscope (SEM) and atomic force microscopy (AFM). In order to investigate the structural properties, the ZnO nanostructures were measured using X‐ray diffractometer (XRD). The optical properties of the ZnO nanostructures were measured using photoluminescence (PL) spectrometer.  相似文献   

    

Mohd Faiz Hassan  ZaiPing Guo  GuoDong Du  David Wexler  HuaKun Liu 《physica status solidi (a)》2009,206(11):2546-2550

A nanocomposite material (SnO₂ Co₃O₄) has been synthesized as an anode material for lithium‐ion batteries by the molten salt method. Characterization by X‐ray diffraction (XRD) and transmission electron microscopy (TEM) showed that the composite has a small particle size. The electrochemical performance was examined, including the charge–discharge and cycling properties. The experimental results showed that the sample containing the highest amount of Co₃O₄ compound exhibited a specific capacity of 355 mAh g⁻¹ after 40 cycles, with cycling at 70 mA g⁻¹ (35.2% higher than for the sample containing a lower amount of Co₃O₄). It seems that increasing the amount of Co₃O₄ can give good capacity retention and high specific capacity.  相似文献