Preparation And Characterization Of Nanothermite Membranes By Electrochemical Deposition

In this paper,nanothermite membranes were prepared by electrochemical reduction deposition in EMIC-AlCl₃ ionic liquid.the deposition regularity of A1 was studied by using the FTO conductive glass substrate in EMIC-AlCl₃ ionic liquid.Three dimensionally ordered Fe₂O₃ and Co₃O₄ nanowire membranes were prepared by colloidal crystal template method,and Co₃O₄ nanowire arrays were prepared on nickel foam via hydro-thermal treatment,respectively.Al was then deposited on the internal surface of different oxide films to prepare nanothermite membranes by electrochemical reduction deposition.XRD?SEM?TEM?DSC and laser ignition were used to characterize the performances of these three kinds of nanothermite membranes.The main conclusions were as follows.The minimum voltage and current density of A12Cl7-reduced to Al is 0.378V and 1mA·cm-2,respectively.When the current is 70mA,the A1 can be prepared on the FTO conductive glass with high purity and good compactness,and the deposition rate of Al is 0.8?m·min-1.The template was prepared by dilution of PS emulsion,and the three dimensionally ordered Fe₂O₃ film with thickness of 1.5?m was prepared with a 2?m thickness template.Fe₂O₃/Al nanothermite membranes were prepared by electrochemical deposition,but the deposited A1 could not be directly deposited on the Fe₂O₃ framework and only filled with the interior of the skeleton structure.The nanothermite membrane has a poor thermal performance because of the composite method and the exothermic maximum is only 222.27J·g-1.The Co₃O₄ nanowires were successfully prepared by the treatment of oxalate with the template.A1 can be carried out on the surface of Co₃O₄ nanowires with certain conductivity.The energy release of Co₃O₄/Al nanothermite membrane achieves its maximum 724.64J·g-1,which is much higher than that of Fe₂O₃/Al nanothermite membrane prepared by the above method.The laser ignition test shows that the Co₃O₄/Al nanothermite membrane has a certain ability of ignition,and the ignition duration was 432.9 s.Co₃O₄ nanowires with good uprightness and uniform distribution were prepared by hydrothermal method on nickel foam.Al can be directly deposited on the surface of Co₃O₄ nanowires by electrochemical deposition.The flame height and flame width after laser ignition are much higher than the prerious one obtained by template method.The nickel foam bridge of Co₃O₄/Al nanothermite membrane can be ignited and has a certain ignition intensity.It can be used as an ignition device.