In‐Situ Fabrication and Characterization of Silver Azide Using Micron‐Scale Silver(I) Oxide as the Precursor

Abstract

Silver azide (AgN 3 ) primary explosive was successfully prepared by in-situ reaction with hydrazoic acid (HN 3 ) using micron-scale silver(I) oxide (Ag 2 O) as the precursor. Ag 2 O particles have been synthesized through a facile chemical precipitation method. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the prepared materials. The effects of reaction time on the mor-phology and phase composition of silver azide were evaluated. Silver azide can be synthesized by in-situ reaction for 12 h. Increasing the azide reaction time is beneficial to the generation of silver azide but has no obvious influence on the morphology. The prepared silver azide micro-charge can be successfully initiated by NiÀ Cr bridge wire and present favourable explosion performance.Keywords: silver azide · in-situ fabrication · silver(I) oxide · primary explosive Figure 6. FT-IR spectrum of the prepared silver azide.

Synthesis of submicron‐sized silver azide by multi‐nozzle spray flash synthesis**

“…The broad, intense band observed at a wavelength of 2000 cm À 1 (Figure 3a) corresponds to the asymmetric stretching of the azide anion (À N 3 ) [9,10]. The spectra of both materials are similar to those reported by Qiang Liu et al [7], which confirms that the particles are indeed composed of silver azide. The X-ray diffraction on powders showed that both samples are made of only one and the same crystallized phase (Figure 3b), which was identified as orthorhombic silver azide (ICSD Collection code: 88335).…”

“…Therefore, this method seems of limited interest to prepare submicrometric particles, even though the use of smaller concentrations of a solvent mixture would decrease the particle size of silver azide synthesized by this process. Liu et al obtained submicrometric AgN 3 powders, with a mean particle size of 500 nm, by an original technique which consisted in flushing an Ag 2 O particle layer by a gaseous hydrazoic acid flow [7]. The final silver azide particles are similar in size to Ag 2 O particles from which they form, but they are less aggregated.…”

“…Liu et al . obtained submicrometric AgN 3 powders, with a mean particle size of 500 nm, by an original technique which consisted in flushing an Ag 2 O particle layer by a gaseous hydrazoic acid flow [7]. The final silver azide particles are similar in size to Ag 2 O particles from which they form, but they are less aggregated.…”

Constructing Highly Reliable and Adaptive Primary Explosive Composites for Micro‐Initiator Assisting by a Hybrid Template of Metal–Organic Frameworks and Cross‐Linked Polymers

“…[ 2 ] However, conventional primary explosives, such as lead azide (LA) and lead styphnate (LS), cannot meet the requirements of micro‐initiators because of their insufficient detonation power and lead contamination issues. [ 1b,2j,3 ] Copper azide (Cu(N 3 ) 2 , CA), with excellent detonation ability and low toxicity, is a promising material for micro‐initiators. Nevertheless, realizing CA in micro‐initiators is limited by its high electrostatic sensitivity.…”

Valence-Oriented Electrosynthesis Strategies of Cu-Based 5-Nitrotetrazolate for Environmentally Acceptable Primary Explosives

“…While various conventional and new energetic materials have been studied as potential alternatives, including silver azide, , 2-diazo-4,6-dinitrophenol (DDNP), calcium 5-nitriminotetrazolate, copper azide, − and potassium 1,1′-dinitramino-5,5′-bistetrazolate, all of them are still restricted from widespread use for certain reasons. A breakthrough was achieved in the discovery of Cu­(I) 5-nitrotetrazolate (DBX-1, CuNT; NT = CN 5 O 2 – ), a primary explosive that currently stands as a leading candidate in existing detonator designs. , This explosive has energetic properties comparable to those of LA, and yet without its toxicity and compatibility drawbacks.…”