Tuning the Reactivity of Nanoenergetic Gas Generators Based on Bismuth and Iodine oxidizers

TL;DR

This paper explores the development of nanoenergetic gas generators using bismuth and iodine compounds, demonstrating their high energy density, controllable combustion, and potential applications in space propulsion and biocidal treatments.

Contribution

It introduces novel NGGs formulations based on bismuth and iodine, with experimental validation showing superior performance and diverse application potentials.

Findings

Generated pressure discharge up to 14.8 kPa m3/g

Achieved high power actuation of 4700 W/kg with carbon nanotube composites

Potential for space propulsion and rapid bacterial destruction

Abstract

There is a growing interest on novel energetic materials called Nanoenergetic Gas-Generators (NGGs) which are potential alternatives to traditional energetic materials including pyrotechnics, propellants, primers and solid rocket fuels. NGGs are formulations that utilize metal powders as a fuel and oxides or hydroxides as oxidizers that can rapidly release large amount of heat and gaseous products to generate shock waves. The heat and pressure discharge, impact sensitivity, long term stability and other critical properties depend on the particle size and shape, as well as assembling procedure and intermixing degree between the components. The extremely high energy density and the ability to tune the dynamic properties of the energetic system makes NGGs ideal candidates to dilute or replace traditional energetic materials for emerging applications. In terms of energy density, performance and controllability of dynamic properties, the energetic materials based on bismuth and iodine compounds are exceptional among the NGGs. The thermodynamic calculations and experimental study confirm that NGGs based on iodine and bismuth compounds mixed with aluminum nanoparticles are the most powerful formulations to date and can be used potentially in microthrusters technology with high thrust-to-weight ratio with controlled combustion and exhaust velocity for space applications. The resulting nano thermites generated significant value of pressure discharge up to 14.8 kPa m3/g. They can also be integrated with carbon nanotubes to form laminar composite yarns with high power actuation of up to 4700 W/kg, or be used in other emerging applications such as biocidal agents to effectively destroy harmful bacteria in seconds, with 22 mg/m2 minimal content over infected area.