Direct Chromatography of Some N-Methylcarbamate Pesticides

1974 ◽  
Vol 57 (3) ◽  
pp. 570-575
Author(s):  
Esther J Lorah ◽  
Delbert D Hemphill
Keyword(s):  
Support Surface ◽  
Detector Calibration ◽  
Vegetable Samples ◽  
Calibration Curves ◽  
Flame Detector ◽  
Surface Modified

Abstract Carbaryl (1-naphthyl methylcarbamate), Mesurol® (4-methylthio-3,5-xylyl methylcarbamate), promecarb (m-cym-5-yl methylcarbamate) , Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate), and 4-dimethylamino-3,5- xylenol were successfully chromatographed on Chromosorb W support, surface-modified with Carbowax 20M. The intact compounds were detected by means of the nitrogen or sulfur response of an alkali flame detector. Calibration curves were linear over the range 4 to 2000 ng. Average pesticide recoveries of 90—100% were obtained from fortified vegetable samples.

Support Modification on the Catalytic Performance of Co/SiO2 Catalyst in Fisher-Tropsch Synthesis

2013 ◽  
Vol 850-851 ◽  
pp. 148-151
Author(s):  
Hong Xia Zhao ◽  
Hai Liang Lü
Keyword(s):  
Catalytic Performance ◽  
Ammonia Solution ◽  
Tropsch Synthesis ◽  
The Other ◽  
Support Surface ◽  
Silica Support ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Surface Modified ◽  
Fisher Tropsch Synthesis

The effects of support modification on cobalt based catalysts in Fischer-Tropsch synthesis were investigated. Part of silica support was modified with ammonia solution and the other part not. The Co/SiO2 catalyst with the support surface modified by ammonia solution showed larger particle size, strong Co-Si interaction, higher activity and selectivity in Fischer-Tropsch synthesis. It could be concluded that the support acidity can be controlled thus affected the reaction property of the catalysts in Fischer-Tropsch synthesis.

Analytical Electron Microscopy of Surface-Modified Ceramics

1985 ◽  
Vol 43 ◽  
pp. 276-279
Author(s):  
P. S. Sklad
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Theoretical Models ◽  
Ceramic Materials ◽  
Solute Concentration ◽  
Second Phase ◽  
Analytical Electron ◽  
Implantation Techniques ◽  
Lattice Damage ◽  
Surface Modified

Over the past several years, it has become increasingly evident that materials for proposed advanced energy systems will be required to operate at high temperatures and in aggressive environments. These constraints make structural ceramics attractive materials for these systems. However it is well known that the condition of the specimen surface of ceramic materials is often critical in controlling properties such as fracture toughness, oxidation resistance, and wear resistance. Ion implantation techniques offer the potential of overcoming some of the surface related limitations.While the effects of implantation on surface sensitive properties may be measured indpendently, it is important to understand the microstructural evolution leading to these changes. Analytical electron microscopy provides a useful tool for characterizing the microstructures produced in terms of solute concentration profiles, second phase formation, lattice damage, crystallinity of the implanted layer, and annealing behavior. Such analyses allow correlations to be made with theoretical models, property measurements, and results of complimentary techniques.

Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

2020 ◽  
pp. 114-119
Keyword(s):  
Solar Cell ◽  
Electrochemical Impedance ◽  
Hybrid Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Annealing Effects ◽  
Vertically Aligned ◽  
Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

Abatement of Heavy Metal from Waste Water Using Surface Modified Adsorbent

2017 ◽  
Author(s):  
Hunge Sudhir ◽  
Rahangdale Pralhad ◽  
Lanjewar Mamata
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Surface Modified
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