Publications

8 Results

Search results

Jump to search filters

Explosive Threats: The Challenges they Present and Approaches to Countering Them

Handbook of Security Science

Hotchkiss, Peter J.

This chapter focuses on explosives-based threats, the challenges they present, and various means by which these challenges can be overcome. It begins with an introduction to explosive threats, detailing statistics regarding their use, and some overarching challenges associated with properly mitigating the risks they present, before delving deeper into different areas of response by government agencies. These response areas are broadly categorized as deter, prevent, detect, delay/ protect, and respond/analyze. Deterrence refers to trying to discourage people from becoming malefactors, with a focus on anti-radicalization programs and ways by which people can be dissuaded to join extremist movements. The section on prevention discusses means by which access to explosive precursor materials and information can be controlled, with a focus on polices and regulations. This includes examples of current regulations, discussion of why specific chemicals are on controlled chemicals lists, and information campaigns to raise awareness of IED threats. The following section gives a brief understanding of the important aspects to consider in detection and describes different explosives detection methods used. Approaches to delaying the use or impact of an explosive threat, as well as those that provide some sort of protection against the effects of an explosive threat, are then described. Lastly, current approaches to response to explosive threats, either before or after detonation, and the importance of analysis, are discussed before summarizing the chapter and providing a near-future outlook.

More Details

An evaluation of complementary approaches to elucidate fundamental interfacial phenomena driving adhesion of energetic materials

Journal of Colloid and Interface Science

Hoss, Darby J.; Knepper, Robert; Hotchkiss, Peter J.; Tappan, Alexander S.; Boudouris, Bryan W.; Beaudoin, Stephen P.

Cohesive Hamaker constants of solid materials are measured via optical and dielectric properties (i.e., Lifshitz theory), inverse gas chromatography (IGC), and contact angle measurements. To date, however, a comparison across these measurement techniques for common energetic materials has not been reported. This has been due to the inability of the community to produce samples of energetic materials that are readily compatible with contact angle measurements. Here we overcome this limitation by using physical vapor deposition to produce thin films of five common energetic materials, and the contact angle measurement approach is applied to estimate the cohesive Hamaker constants and surface energy components of the materials. The cohesive Hamaker constants range from 85 zJ to 135 zJ across the different films. When these Hamaker constants are compared to prior work using Lifshitz theory and nonpolar probe IGC, the relative magnitudes can be ordered as follows: contact angle > Lifshitz > IGC. Furthermore, the dispersive surface energy components estimated here are in good agreement with those estimated by IGC. Due to these results, researchers and technologists will now have access to a comprehensive database of adhesion constants which describe the behavior of these energetic materials over a range of settings.

More Details
8 Results
8 Results