排序方式: 共有134条查询结果,搜索用时 281 毫秒
51.
Selective electroless metal deposition using microcontact printing of phosphine-phosphonic acid inks
Carmichael TB Vella SJ Afzali A 《Langmuir : the ACS journal of surfaces and colloids》2004,20(13):5593-5598
We report a low-cost approach to selectively deposit films of nickel and copper on glass substrates. Our approach uses microcontact printing of organic inks containing phosphonic acid groups to bind the ink to a glass substrate and phosphine groups to bind a colloidal catalyst that initiates electroless metallization. We demonstrate this procedure by fabricating patterned nickel and copper films with areas as large as 15 cm2 and minimum feature sizes of approximately 2 microm. We present studies on the use of two ink types, an oligomer and a bifunctional molecule, and demonstrate that pattern quality and adhesion of the metallized films depends on the molecular weight of the ink and the ratio of phosphine and phosphonic acid groups. 相似文献
52.
Moslem M. Lakouraj Barahman Movassagh Zahra Fadaei 《Monatshefte für Chemie / Chemical Monthly》2002,93(1):1085-1088
Various thiol esters were prepared by condensation of acyl chlorides with disulfides in the presence of Zn/AlCl3. The advantages of this method are high yields under relatively mild conditions, simple work-up, lack of toxicity, and low costs. 相似文献
53.
In this paper, a popular scalarization problem in multiobjective optimization, introduced by Benson, is considered. In the literature it was proved that, under convexity assumption, the set of properly efficient points is empty when the Benson’s problem is unbounded. In this paper, it is shown that this result is still valid in general case without convexity assumption. 相似文献
54.
Mahmood Tajbakhsh Moslem M. Lakouraj Majid S. Mahalli 《Monatshefte für Chemie / Chemical Monthly》2008,10(2):1453-1456
Various symmetrical dialkyl and diacyl disulfides are prepared easily in high yields from the corresponding alkyl and acyl
halides under mild and nonaqueous conditions using N,N′-dibutyl-N,N,N′,N′-tetramethyl-ethylenediammonium tetrahydroborate (BTMETB) or N,N′-dibenzyl-N,N,N′,N′-tetramethylethylenediammonium tetrahydroborate (BZTMETB) and elemental sulfur. The quaternary diammonium borohydrides were easily prepared by treatment of the corresponding quaternary
diammonium chloride or bromide with alkaline solution of sodium borohydride at room temperature. 相似文献
55.
Mahmood Tajbakhsh Moslem M. Lakouraj Majid S. Mahalli 《Monatshefte für Chemie / Chemical Monthly》2008,139(12):1453-1456
Various symmetrical dialkyl and diacyl disulfides are prepared easily in high yields from the corresponding alkyl and acyl
halides under mild and nonaqueous conditions using N,N′-dibutyl-N,N,N′,N′-tetramethyl-ethylenediammonium tetrahydroborate (BTMETB) or N,N′-dibenzyl-N,N,N′,N′-tetramethylethylenediammonium tetrahydroborate (BZTMETB) and elemental sulfur. The quaternary diammonium borohydrides were easily prepared by treatment of the corresponding quaternary
diammonium chloride or bromide with alkaline solution of sodium borohydride at room temperature.
Correspondence: Mahmood Tajbakhsh, Department of Chemistry, Mazandaran University, Babolsar, Iran. 相似文献
56.
Saba Hajiali Afzali Rohoullah Firouzi Ilia Korobkov 《Journal of Coordination Chemistry》2018,71(8):1234-1249
The behavior of organo-aluminum species with 2,3-bis(2-pyridyl) quinoxaline (DPQ), a well-known polyazine capable of performing interesting radical transformations, was examined in the presence and absence of chromium. In spite of proving the presence of chromium as essential for reactivity, only organic radicals, coupled to aluminum-containing residues, have been isolated and characterized. The electronic structure of the organic radicals has been elucidated by a combination of crystallographic, DFT calculations and EPR studies. Experimental and computational work has highlighted the co-existence of both singlet and triplet forms in one di-radical complex. 相似文献
57.
Daryoush Afzali Moslem Afzali Maryam Ghanbarian 《International journal of environmental analytical chemistry》2018,98(4):338-348
In the present study, the ?5-(4-dimethylaminobenzylidene)rhodanin-modified SBA-15? was applied as stable solid sorbent for the separation and preconcentration of trace amounts of cobalt ions in aqueous solution. SBA-15 was modified by ?5-(4-dimethylaminobenzylidene)rhodanin reagent. The sorption of Co2+ ions was done onto modified sorbent in the pH range of 6.8–7.9 and desorption occurred in 5.0 mL of 3.0 mol L?1 HNO3. The results exhibit a linear dynamic range from 0.01 to 6.0 mg L?1 for cobalt. Intra-day (repeatability) and inter-day (reproducibility) for 10 replicated determination of 0.06 mg L?1 of cobalt was ±1.82% and ?±1.97%?. Detection limit was 4.2 µg L?1 (3Sb, n = 5) and preconcentration factor was 80. The effects of the experimental parameters, including the sample pH, flow rates of sample and eluent solution, eluent type and interference ions were studied for the preconcentration of Co2+. The proposed method was applied for the determination of cobalt in standard samples, water samples and agricultural products. 相似文献
58.
In the present work a sensitive and selective electrochemical sensor was fabricated based on a glassy carbon electrode which has been modified with Pd nanoparticles loaded on Vulcan carbon/conductive polymeric ionic liquid composite nanofibers. The nanostructures were characterized by UV–Vis, FT-IR, FESEM, EDX and XRD techniques. The electrochemical study of the modified electrode, as well as its efficiency for the electrooxidation of tramadol was described in 0.1 M phosphate buffered solution (PBS) (pH 7.0) using cyclic voltammetry, linear sweep voltammetry, chronoamperometry and square wave voltammetry as diagnostic techniques. It has been found that application of the composite nanofibers result in a sensitivity enhancement and a considerable decrease in the anodic overpotential, leading to negative shifts about 200 mV in peak potential. The results exhibit a linear dynamic range from 0.05 μM to 200 μM and a detection limit of 0.015 μM for tramadol. Finally, the modified electrode was used for the determination of tramadol in pharmaceutical and biological samples. 相似文献
59.
Karimi-Jaberi Zahed Moaddeli Mohammad Sadegh Setoodehkhah Moslem Nazarifar Mohammad Reza 《Research on Chemical Intermediates》2016,42(5):4641-4650
Research on Chemical Intermediates - A clean, efficient and eco-friendly procedure has been developed using nano-copper chromite (nano-CuCr2O4) as catalyst for the synthesis of biscoumarin and... 相似文献
60.