Stabilization of Metal Nanoparticles – A Chemical Approach

Gromov, A. A.; Strokova, Yulia Igorevna; Teipel, Ulrich

doi:10.1002/ceat.200900022

Cited by 35 publications

(17 citation statements)

References 27 publications

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“…Surface passivation or functionalization treatment has been proven as an effective pathway to enhance the stability of ANPs . In fact, most commercial ANPs are passivated by a thin alumina (Al 2 O 3 ) layer with a thickness of 2–5 nm, depending on the particle size, and this inert layer plays a critical role in restraining the spontaneous combustion and ensuring the safety during the handling process . 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.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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

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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.

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Section: Introductionmentioning

confidence: 99%

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

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“…Functionalization of metal surfaces can be beneficial to the dispersion and stabilization of metal NPs in solution [181][182][183][184] . Conjugation with organic molecules such as ligands 185,186 or proteins 12, 187, 188 may enable NP self-organization 189,190 , or may protect against corrosion 191,192 .…”

Section: Chemistry Of Metal Surfacesmentioning

confidence: 99%

The fabrication and surface functionalization of porous metal frameworks – a review

Dumée

Bao

et al. 2013

J. Mater. Chem. A

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Porous metal frameworks offer potentially useful applications for the aerospace, automotive and bio-medical industries. They can be used as electrodes, actuators, or as selective membrane films. The versatility of the physical features (pore size, pore depth, overall porosity and pore surface coverage) as well as the large range of surface chemistries for both metal oxides and pure noble metals offers scope to functionalise metal nano-particles and networks of nano-porous metal structures. As well as traditional routes to producing metal structures, such as metal sintering or foaming, novel high-throughput techniques have recently been investigated. Nanoparticle self-assembly, metal ion reduction and deposition as well as metal alloy de-alloying were identified as sustainable routes to produce large surface areas of such nano-porous metal frameworks. The main limitations of the current fabrication techniques include the difficulty to process stable and homogeneous arrays of nano-scale pores and the control of their morphology due to the high reactivity of nano-structured metal structures. This paper aims at critically reviewing the various fabrication techniques and surface functionalization routes used to produce advanced functional porous metal frameworks. The limitations and advantages of the different fabrication techniques will be discussed in light of the final material properties and targeted applications. Keywordsporous metal frameworks; porous metal fabrication routes; metal surface chemistry; application of metal frameworks; 3

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“…However, for every plus there is a minus, and the high chemical reactivity of ANPs also triggers a series of problems: ANPs are vulnerable when exposed to an oxygen environment. Related research studies show that compared with micron-sized Al powders, the weight content of aluminium oxide for most ANPs exceeds 10%, whereas that of micro-sized Al powders is only 1.5-5% [4][5][6]. Moreover, it is another challenge to properly store ANPs and maintain their chemical activity for a long period of time.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of ethanol molecules on the Al (1 1 1) surface: a molecular dynamic study

Liu

Wang

2019

R. Soc. open sci.

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The adsorption process of ethanol molecules on Al slabs was investigated by molecular dynamic simulations with a ReaxFF force field. The force field used in this paper has been validated by comparing adsorption energy results with quantum mechanical (QM) calculations. All simulations were performed under the canonical (NVT) ensemble. The single-molecule adsorption simulation shows that the hydroxyl group plays a more important role in the whole progress than the ethyl group. Besides, decomposition of hydroxyl groups was also observed during multimolecule adsorption processes. Simulations of adsorption processes of Al slab by ethanol molecules at different temperatures and pressures (controlled by the number of ethanol molecules) was also performed. System energy and radial distribution function (RDF) plots were invoked to describe adsorption processes and centro-symmetry parameter (CSP) analysis was adopted to study the surface properties with coating layers. Our results indicate that the whole adsorption process can be divided into two periods and the greater the pressure, the more ethanol molecules diffuse into the Al slab. How raising the temperature helps the adsorption processes is related to the initial number of molecules. The crystal structure of the Al surface will become amorphous under the constant impact of ethanol molecules.

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Stabilization of Metal Nanoparticles – A Chemical Approach

Cited by 35 publications

References 27 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

The fabrication and surface functionalization of porous metal frameworks – a review

Adsorption of ethanol molecules on the Al (1 1 1) surface: a molecular dynamic study

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