Papers by Keyword: Dispersant

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Authors: Young Jin Choi, Sung Hyun Kim, Sang Choul Park, Dong Hyun Shin, Dong Hun Kim, Ki Won Kim
Abstract: In this study, we investigated ionic conductivities of the electrolytes and cycle performances of Li/S cells using the electrolyte. (PEO)10LiCF3SO3 composite polymer electrolyte(CPE) containing carbon powders and Brij dispersant was prepared by ball milling for 12hr. The 5wt% carbon powders having high surface area (~ 80 m2/g) was added into the (PEO)10LiCF3SO3 electrolyte. To get a well-dispersed structure, Brij dispersant was also added into the (PEO)10LiCF3SO3-5wt%Carbon electrolyte. Li/CPEs/50wt%S cells showed initial discharge capacities of between 1,250 and 1,413 mAh/g-sulfur with current density of 100 mA/g-sulfur at 80 °C. These results led us to conclude that the dispersants added into the CPE improved the initial discharge capacities and cycle performances.
Authors: Han Hao, Jian Guo Feng, Xin Yu Guo, Wen Jun Liu, Xue Min Wu
Abstract: Some factors such as imidacloprid dose, contact time, initial NNO concentration, stirring speed and temperature affecting the dispersant NNO (formaldehyde condensate sodium salt of naphthalene sulfonic acid) adsorption on imidacloprid particle was investigated in this paper. It demonstrated that NNO adsorption amount decreased with the increasing imidacloprid dose and temperature, but increased with the increasing contact time, initial NNO concentration and stirring speed. The results implied that the dispersant NNO was adsorbed on imidacloprid particle physically and exothermically.
Authors: V. Srinivas, Dedeepya Valluripally, P.V. Manikanta, V. Satish
Abstract: This works presents a study on anti friction properties, of fully formulated SAE 20W 40 grade motor oil dispersed with surface modified WS2 and MoS2 nanoparticles. WS2 and MoS2 particles of 0.05 wt. % and 0.1 wt. % have been dispersed in SAE 20W 40 motor oil by Sonication and tested for tribological behavior on pin on disc apparatus as per ASTM G99 standards. The friction coefficient values for base oil and oil dispersed with WS2 and MoS2 nanoparticles have been evaluated and compared to obtain the performance analysis. Performance graphs have plotted for the base oil and oil dispersed with nanoparticles for comparison. The oils with dispersed nanoparticles have shown enhanced performance in comparison to the base oils in terms of anti friction properties.
Authors: Qing Zhong Xu, Xing Ai, Jun Zhao, Feng Gong, Xian Hua Tian, Hong Shan Zhang
Abstract: A good dispersion of powders is crucial to obtain the sintered materials with superior properties. In this paper, the application of different dispersants in fabricating Ti (C,N)-based cermets was investigated. The effect of dispersant on the microstructure and mechanical properties of cermet materials was studied by observing the microstructure, indention cracks and fracture morphology using scanning electron microscope (SEM), and by measuring the transverse rupture strength (TRS), Vickers hardness (HV) and fracture toughness (KIC). The results reveal that the dispersant oleic acid is helpful for the dispersion of Ti (C,N)-based cermet powders, and can contribute to the homogeneous microstructure and stable mechanical properties of the cermet materials. Compared with the cermets fabricated with polyethylene glycol (PEG), the microstructure of cermets fabricated with oleic acid shows more homogeneously distributed Ti (C,N) particles embedded into more evenly spread binder phases without agglomerations of Ti (C,N) grains. The cermets fabricated with oleic acid possess better comprehensive mechanical properties, with higher transverse rupture strength, hardness and a bit lower fracture toughness than the cermets fabricated with PEG.
Authors: Wei Neng Wen, Yu Xia Pang, Hong Ming Lou, Xin Ping Ouyang
Abstract: Lignosulfonate (LS) is an important dispersant for wettable powder (WP). Though domestic products of lignosulfonate in China are very cheap compared to imported products, their performance is often inferior. Two modified products GCL4-1 and GCL4-A, from sodium lignosulfonate and alkali lignin respectively, were developed and their dispersive effects on the performance of 40% myclobutanil wettable powder (WP) were studied compared with the imported product Borresperse Na and the domestic product SXMN. Results show that GCL4-1 and GCL4-A have superior performance in these properties: suspensibility, wettability, surface tension, contact angle and solution retention. GCL4-A was found to be a suitable dispersant for the wettable powder pesticide for it has the best performance per unit price.
Authors: Carmen Galassi, E. Roncari, R. Greenwood, A. Piancastelli
Authors: Yin Long Zhang, Wei Jiang, Long Lin
Abstract: Magnetic cards are widely used as credit cards, gift cards and VIP cards. In many industries, the principal method for producing the magnetic stripe still employs magnetic tapes. Therefore, if magnetic inks could be printed directly on the poly (vinyl chloride) (PVC) cards, then there would be the potential to improve industrial efficiency significantly. In order to apply the magnetic inks to the credit cards or other PVC cards, the Screen printing technique was chosen as a suitable printing method.In formulation 19, it is easy to mix and disperse the iron oxide powders in binder, few agglomerates and agglomerates occurred in the dispersion and also the film thickness of this formulation is around 20 microns which is ideal for the magnetic stripe.
Authors: Sussette Padilla, Maria Vallet-Regí
Authors: Li Li Zhang, Yu Hong Chen, Li Min Qi
Abstract: The dispersion stability of silicon carbide whisker (SiCw) which is by-product of SiC was researched using distilled water as dispersing medium, polyethylene imine (PEI), tetramethylammonium hydroxide (TMAH), poly(meth)acrylamide (PMAM) as the dispersants. The sedimentation and optical microscope technology are used to observe whisker dispersion ,FTIR and ZETA electric potential are used to explore its dispersion mechanism . The results show that the order of dispersion capacity of the dispersant was PEI> TMAH> PMAM.When 1.25vol% PEI was used as dispersant, SiCw can be dispersed homogeneously at pH=9 and 10, in the meanwhile, if TMAH was used, the added amount would be 0.75vol% in which the pH is in range of 11-12.
Authors: Shu Kun Li, Lu Hai Li, Xian Leng, Wen Bo Li, Xu Wei Hu, Wei Wei Li
Abstract: The performance of the dispersion of cobalt blue in organic solvent is studied. The influence of dispersant (type & dosage), pH value, and other dispersion parameters on the stability of cobalt blue dispersion system is tested which shows good stability and excellent dispersion performance with diethylamide glycol ether the solvent, complex formulation (M (KH550): M (KH560): M (A-842) = 1:1:2) the dispersant and 7 the pH value. The characteristics of dispersion system are evaluated through sedimentation experiment and measurement of article size distribution. The most steady dispersion system is formed through high speed shearing force and the size of cobalt blue in this system is about 300nm.
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