Pyrolysis and combustion characteristics of aluminum hydride coated with an oxide layer and stearic acid

Fabrication of superhydrophobic coating on PEO treated zirconium samples and its corrosion resistance

Oily sewage and floating oil in the ocean post a huge threat to the ecological environment, therefore, developing an efficient separation for oil/water mixtures is an urgent need. Currently, superhydrophobic materials exhibit excellent oil/water separation ability. In this study, a superhydrophobic copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in FeCl3 solution for chemical etching to make the surface rough, stearic acid (SA) is used for in-situ growth to reduce the surface energy, a superhydrophobic oil-water separation copper mesh is obtained. The water contact angle (WCA) of the copper mesh is more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 98%. The effects of the concentration of FeCl3 and SA on the contact angle and oil-water separation efficiency are investigated, the results show that when the concentration of FeCl3 is 2% and SA is 1.5%, the WCA and oil-water separation efficiency are the largest. The research used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.

Pyrolysis characteristics, kinetics and evolved volatiles determination of rice-husk-based distiller's grains

Thin films of organic fatty acids such as stearic acid (C 17 H 35 COOH), deposited by Langmuir-Blodgett technique have been widely investigated and the progress reviewed (1,2). However, very little is known about the conduction and breakdown characteristics of thin films of stearic acid deposited by thermal evaporation in vacuum. Agarwal and Mitsuhashi (3) have studied the high field conduction characteristics using a planar electrode geometry and Kasilingam et al (4,5) have reported the conduction and breakdown characteristics on sandwich electrode geometry. In these studies (3–5) the film deposition parameters were; pressure in the 10−5 to 10−6 Torr range and film deposition rate of −10A/s. Moreover, no attempt was made to avoid the formation of an Al 2 O 3 film on the lower aluminum electrode prior to the deposition of the stearic acid film. In this paper we have reported breakdown behavior and dielectric nature of stearic acid films deposited at much lower pressure (∼10−8 Torr) and at a much lower film deposition rate). We have also used proper masking and a dual source evaporator to deposit the lower Al electrode and the stearic acid film without disturbing the vacuum so that no oxide layer is formed between the lower electrode and the stearic acid film. Sandwich structures have capacitance/area ranging from 0.027 to 0.033 f/m2, the dielectric constant between 1.45 and 2.04, and DC breakdown field strength ranging from 9.27 × 107 to 7.63 × 108 V/m.

Sensitive detection of histamine utilizing the SERS platform combined with an azo coupling reaction and a composite hydrophobic layer

To further understand the problems of coal combustion and coalfield fire reignition, this paper researched the reaction characteristics of coal pyrolysis and low oxygen combustion and the reburning oxidation characteristics of residual structure by thermal analysis methods. The results show that temperature promotes both pyrolysis and low oxygen combustion reactions, but low oxygen combustion reaction is more sensitive to temperature changes. As the constant temperature rises, the mass reduction rate of low oxygen combustion of coal samples reaches 80% on average, which is 4 times that of pyrolysis, and the variations of thermogravimetric parameters are also significantly higher than those of pyrolysis. However, the higher the pyrolysis degree of the residues, the stronger their oxidizability, which greatly enhances the intensity and concentration of the secondary combustion, and the mass of residues is reduced by 90% on average. Conversely, because the combustible components are continuously consumed during low oxygen combustion, the reburning characteristics of residues become less obvious. For instance, the weight loss rate slows down, the burning becomes dispersed, and the burning intensity is weakened. In addition, the heat release is reduced from 8662 to 444.5 J/g, and the change trend is just opposite to that of pyrolysis. The above results show that as the constant temperature rises, the pyrolysis reaction greatly shortens the reburning process, while the low oxygen combustion reaction largely inhibits the reburning.

Research progress in thermal reaction processes of biomass with laser-induced fluorescence spectroscopy

Effect of pyrolysis and oxidation characteristics on lauric acid and stearic acid dust explosion hazards

Pyrolysis characteristics, kinetics, and evolved gas determination of chrome-tanned sludge by thermogravimetry–Fourier-transform infrared spectroscopy and pyrolysis gas chromatography-mass spectrometry

Oily sewage and floating oil in the ocean have a huge threat to the ecological environment, and the preparation of oil-water separation materials has been a significant issue. In this study, the super-hydrophobic oil-water separation copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in a ferric chloride solution for chemical etching to make the surface rough, stearic acid is used for in-situ growth to reduce the surface energy, a super-hydrophobic oil-water separation copper mesh is obtained. The contact angle of the copper mesh can reach more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 97%. The study used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.

Oily sewage and floating oil in the ocean have a huge threat to the ecological environment, and the preparation of oil-water separation materials has been a significant issue. In this study, the super-hydrophobic oil-water separation copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in a ferric chloride solution for chemical etching to make the surface rough, stearic acid is used for in-situ growth to reduce the surface energy, a super-hydrophobic oil-water separation copper mesh is obtained. The contact angle of the copper mesh can reach more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 97%. The study used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.

Oily sewage and floating oil in the ocean have a huge threat to the ecological environment, and the preparation of oil-water separation materials has been a significant issue. In this study, the super-hydrophobic oil-water separation copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in a ferric chloride solution for chemical etching to make the surface rough, stearic acid is used for in-situ growth to reduce the surface energy, a super-hydrophobic oil-water separation copper mesh is obtained. The contact angle of the copper mesh can reach more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 97%. The study used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.

Long term testing for dropwise condensation using self-assembled monolayer coatings of n-octadecyl mercaptan

Oily sewage and floating oil in the ocean have a huge threat to the ecological environment, and the preparation of oil-water separation materials has been a significant issue. In this study, the super-hydrophobic oil-water separation copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in a ferric chloride solution for chemical etching to make the surface rough, stearic acid is used for in-situ growth to reduce the surface energy, a super-hydrophobic oil-water separation copper mesh is obtained. The contact angle of the copper mesh can reach more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 97%. The study used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.

Oily sewage and floating oil in the ocean have a huge threat to the ecological environment, and the preparation of oil-water separation materials has been a significant issue. In this study, the super-hydrophobic oil-water separation copper mesh prepared by the chemical etching method and the in-situ growth method and the performance evaluation are introduced. The oxide layer on the surface of the copper mesh is first removed by pickling, and then immersed in a ferric chloride solution for chemical etching to make the surface rough, stearic acid is used for in-situ growth to reduce the surface energy, a super-hydrophobic oil-water separation copper mesh is obtained. The contact angle of the copper mesh can reach more than 160°. The copper mesh is chemically stable and can effectively adsorb floating oil and separate the oil-water mixture. After several oil-water separation experiments, the oil-water separation efficiency can still be above 97%. The study used a simple and environmentally friendly method to prepare the oil-water separation copper mesh, which has important application significance for water quality restoration.