Combustion characterization and modeling of novel nanoenergetic composites of Co3O4/nAl. Issue 28 (24th February 2015)

• Record Type: Journal Article
• Authors: Patel, Vinay Kumar; Saurav, Jayant Raj; Gangopadhyay, Keshab; Gangopadhyay, Shubhra; Bhattacharya, Shantanu
• Is Part Of: RSC advances. Volume 5:Issue 28(2015)
• Page Start: 21471
• Page End: 21479
• Publication Date: 2015-02-24
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4ra14751k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Novel Co3 O4 nanobelts based bulk nanoenergetic systems have been developed which are able to generate mild to moderate peak pressure and pressurization rates as demanded in shock wave mediated biomedical applications. Abstract : Nanoenergetic materials have been widely explored for obtaining rapid release of energy, burn-speeds and high pressurization rates. In this study, we have synthesized Co3 O4 nanobelts via a simple solid-state process and further integrated as-prepared Co3 O4 and calcined Co3 O4 (at 400 °C for 4 hr) (Co3 O4 -400) with nano-aluminum (nAl) to realize novel bulk nanoenergetic systems of Co3 O4 /nAl and Co3 O4 -400/nAl respectively. The heat of reaction and combustion performance of these nanoenergetic systems are studied by thermogravimetric and differential scanning calorimetry (TG-DSC), combustion front-wave speed and pressure–time characteristics measurements. The heat of reaction has been measured to be 0.96 kJ g −1 for Co3 O4 /nAl and 1.02 kJ g −1 for Co3 O4 -400/nAl nanoenergetic systems. The Co3 O4 /nAl nanoenergetic system is able to develop mild peak pressure (12.6 ± 1 to 20 ± 2 MPa) and pressurization rate (0.08 ± 0.05 to 0.14 ± 0.05 MPa μs −1 ) having a characteristics of low gas generation, which can be harnessed in low intensity pressure-pulse based microporation of soft matters like bacterial cells without any lysis. The calcined Co3 O4 oxidizer is capable to develop more reactive nanoenergetic system than Co3 O4 /nAl, reflecting the generation of moderate peak pressure (26 ± 2 to 32.6 ± 3 MPa) and pressurization rate (0.29 ± 0.1 to 0.47 ± 0.1 MPa μs −1 ). The propagating flames of (Co3 O4 /Co3 O4 -400)/nAl are observed accelerating during instrumented burn tube combustion experiment with front combustion front-wave speed ranging from 480 ± 25 to 830 ± 75 m s −1 . Through this paper, the Co3 O4 nanoenergetic oxidizers can be utilized in the generation of low to moderate pressure pulses to transport biological materials to soft matters.