Enhanced active aluminum content and thermal behaviour of nano-aluminum particles passivated during synthesis using thermal plasma route

Mathe, V. L.; Varma, Vijaykumar B.; Raut, Suyog A.; Nandi, A. K.; Pant, Arti; Prasanth, Hima; Pandey, R. K.; Bhoraskar, S. V.; Das, Anath Bandhu

doi:10.1016/j.apsusc.2016.01.246

Cited by 24 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Except for the natural Al 2 O 3 layer, secondary coatings can also offer a protective effect on preventing further oxidation, thereby extending the shelf life of ANPs. Generally, the passivation coating can be divided into two categories based on whether it can serve as an energetic component during the oxidation process of ANPs . One is a nonenergetic layer, such as oleic acid, polydopamine, and zirconia, and the other is an energetic layer, like nitrocellulose, nickel, and iron .…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

The stability of aluminum (Al) nanoparticles (ANPs) is a key issue that can determine the energetic properties of Al‐based energetic materials. In this study, a surface functionalization approach is employed, using the chemical adsorption and auto polymerization effects of the 1H, 1H, 2H, 2H‐perfluorodecyltriethoxysilane (FAS‐17), to set up a highly stable barrier coating to water and further endow ANPs with long‐term storage stability and self‐activation reaction capability. The FAS‐17‐modified ANPs (AFNPs) with a superhydrophobic surface show their excellent stability in air and unique strengths in corrosion resistance to water by enhancing diffusion resistance of O2 and preventing the hydration reaction. In terms of energetic performances, compared to the two‐step slow oxidation of ANPs, the heat‐release rate of AFNPs is significantly enhanced, resulting in a drastic oxidation process profiting from the surface reaction between the FAS‐17 and alumina (Al2O3) layer. More importantly, the ignition and combustion properties of AFNPs are also greatly improved, which can undergo self‐propagation combustion with a fairly high energy output even after stored in water. At last, the possible mechanisms of oxidation resistance and self‐activation reaction capacities are also proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Metallic Al particles have also been investigated for potential applications as fuels, energy storage materials, and pigments [4][5][6]. Many reported methods for synthesizing metallic Al particles involve the electrical evaporation or explosion of metallic Al wire in a gaseous medium, which is a well-known gasphase process for synthesizing particles [7][8][9][10][11][12]. Although this gas-phase process works well, it requires equipment that is expensive, consumes a large amount of electric power, and is complicated and dangerous to perform.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of metallic aluminum particles by electrolysis in aqueous solution

Hosoya

Yonezawa

Yamauchi

et al. 2021

Micro and Nano Syst Lett

View full text Add to dashboard Cite

The present work proposes a method for fabricating metallic Al particles in aqueous solution. An aqueous colloidal solution was prepared from an aqueous aluminum nitrate nonahydrate solution by electrolysis using metallic Al plates as the anode and cathode under ultrasonic irradiation in water at 25–45 °C. The sizes of the particles in the colloidal solutions prepared at 25, 35, and 45 °C were 76.3, 77.0, and 84.7 nm, respectively. The powder obtained from the colloidal solution prepared at 25 °C was not crystalline. By contrast, the powders obtained from the colloidal solutions prepared at 35 and 45 °C had a crystal structure of cubic Al and crystal sizes of 55.7 and 59.3 nm, respectively. Thus, elevated temperatures promoted both particle growth and crystal growth, which was explained by higher temperatures increasing the frequency and energy of particle collisions. The metallic Al particles were chemically stable in both an aqueous solution and the ambient atmosphere. The chemically stable metallic Al particles are expected to be used as sources for fabricating materials related to fuels, energy storage, and pigments.

show abstract

“…Surface passivation of Al nanoparticles is a common method to enhance the stability of Al nanoparticles. − The passivation films can be classified into two categories depending on the materials, both of which should have good oxidation resistance and are thin enough to maintain the weight percentage of metallic Al. , The first type is an organic coating such as toluene, isopropyl alcohol, perfluorodecalin, alkyl-substituted epoxides, and varieties of organic acids. − These organic coatings can effectively resist humidity; however, they are still permeable to oxygen and water at high temperatures, which can lead to the oxidation of internal metallic Al . The second type involves an inorganic passivation film represented by alumina (Al 2 O 3 ) and silica (SiO 2 ), which can be formed by either internal oxidation or external chemical coating. ,,, Although the Al 2 O 3 coated Al nanoparticles exhibit good stability at 60 °C with a relative humidity of 90%, the thick Al 2 O 3 coatings (≥5 nm) prepared by a thermal oxidation process have greatly reduced the weight percentage of metallic Al. , Moreover, the Al 2 O 3 coatings have exhibited a limited resistance under more harsh conditions, such as higher temperature and humidity, which will lead to the further loss of metallic Al. The failure of Al 2 O 3 coatings is usually attributed to the continued reaction between the metallic Al and AlOOH formed by the reaction of Al 2 O 3 coatings and water.…”

Section: Introductionmentioning

confidence: 99%

“…15−25 The passivation films can be classified into two categories depending on the materials, both of which should have good oxidation resistance and are thin enough to maintain the weight percentage of metallic Al. 15,16 The first type is an organic coating such as toluene, isopropyl alcohol, perfluorodecalin, alkyl-substituted epoxides, and varieties of organic acids. 16−23 These organic coatings can effectively resist humidity; however, they are still permeable to oxygen and water at high temperatures, which can lead to the oxidation of internal metallic Al.…”

Section: Introductionmentioning

confidence: 99%

“…22 The second type involves an inorganic passivation film represented by alumina (Al 2 O 3 ) and silica (SiO 2 ), which can be formed by either internal oxidation or external chemical coating. 15,19,24,25 Although the Al 2 O 3 coated Al nanoparticles exhibit good stability at 60 °C with a relative humidity of 90%, the thick Al 2 O 3 coatings (≥5 nm) prepared by a thermal oxidation process have greatly reduced the weight percentage of metallic Al. 15,19 Moreover, the Al 2 O 3 coatings have exhibited a limited resistance under more harsh conditions, such as higher temperature and humidity, which will lead to the further loss of metallic Al.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrathin Zirconia Passivation and Stabilization of Aluminum Nanoparticles for Energetic Nanomaterials via Atomic Layer Deposition

Chen

et al. 2018

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The stability of aluminum (Al) nanoparticles is a key issue that determines the energy performance of solid fuels, Al-based green propellants, and fuel cells. The surface native oxide shell (Al 2 O 3 ), nevertheless, cannot stabilize Al nanoparticles under hot water conditions. Herein, we report a passivation method utilizing an ultrathin zirconia (ZrO 2 ) coating via atomic layer deposition, where a sub-nanometer coating layer could completely prevent the reactions between Al nanoparticles and hot water (80 °C). The weight percentage of metallic Al for ultrathin ZrO 2 coated Al nanoparticles can reach 82.2 wt %, which is close to that of original Al nanoparticles with Al 2 O 3 native oxide (88 wt %). The metallic Al's weight has been kept at 93.4% for the ultrathin ZrO 2 coated Al nanoparticles compared to the original Al nanoparticles. As a comparison, the Al 2 O 3 coated Al nanoparticles result in the oxidation failure in 60 °C water. The proposed passivation mechanism is attributed to ZrO 2 coating's structural stability and the enhanced hydrophobicity to water. The ultrathin ZrO 2 passivation offers a valuable tool for enhancing the stability of Al nanoparticles and thereby enables their potential applications in energy field.

show abstract

Enhanced active aluminum content and thermal behaviour of nano-aluminum particles passivated during synthesis using thermal plasma route

Cited by 24 publications

References 33 publications

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Synthesis of metallic aluminum particles by electrolysis in aqueous solution

Ultrathin Zirconia Passivation and Stabilization of Aluminum Nanoparticles for Energetic Nanomaterials via Atomic Layer Deposition

Contact Info

Product

Resources

About