Stabilizing decontamination foam using surface-modified silica nanoparticles containing chemical reagent: foam stability, structures, and dispersion properties

Yoon, In-Ho; Yoon, Suk Bon; Sihn, Youngho; Choi, Mansoo; Jung, Chong‐Hun; Choi, Wang-Kyu

doi:10.1039/d0ra07644a

Cited by 18 publications

(8 citation statements)

References 61 publications

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“…The stability of decontamination foams that contain a chemical reagent is a necessity for their usage in nuclear power plant decontamination. The effects of adding silica NPs modified with various functional groups, such as propyl (-CH 3 ), amine (-NH 2 ) and thiol (-SH) on decontamination foam stability was recently reported [96]. The surface properties of these silica NPs were characterized using ATR-FTIR analyses.…”

Section: Spectral Studies Of Foamsmentioning

confidence: 99%

“…The foam stability is improved by the well-dispersed and smaller amine-modified silica NPs, which act as a barrier between the gas bubbles and prevent their coalescence. The thiol and propyl-modified silica NPs create large-diameter aggregates that diminish the maximal capillary pressure of coalescence and hence reduce foam stability [96].…”

Section: Spectral Studies Of Foamsmentioning

confidence: 99%

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Spectral Properties of Foams and Emulsions

2021

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The optical and spectral properties of foams and emulsions provide information about their micro-/nanostructures, chemical and time stability and molecular data of their components. Foams and emulsions are collections of different kinds of bubbles or drops with particular properties. A summary of various surfactant and emulsifier types is performed here, as well as an overview of methods for producing foams and emulsions. Absorption, reflectance, and vibrational spectroscopy (Fourier Transform Infrared spectroscopy-FTIR, Raman spectroscopy) studies are detailed in connection with the spectral characterization techniques of colloidal systems. Diffusing Wave Spectroscopy (DWS) data for foams and emulsions are likewise introduced. The utility of spectroscopic approaches has grown as processing power and analysis capabilities have improved. In addition, lasers offer advantages due to the specific properties of the emitted beams which allow focusing on very small volumes and enable accurate, fast, and high spatial resolution sample characterization. Emulsions and foams provide exceptional sensitive bases for measuring low concentrations of molecules down to the level of traces using spectroscopy techniques, thus opening new horizons in microfluidics.

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Section: Spectral Studies Of Foamsmentioning

confidence: 99%

Section: Spectral Studies Of Foamsmentioning

confidence: 99%

Spectral Properties of Foams and Emulsions

2021

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“…Owing to its special physical and chemical properties, it was used in the decontamination of decommissioned nuclear facilities in France as early as the 1990s [ 8 ]. Foam decontamination mainly depends on the foam carrying chemical reagents with excellent solubility for radioactive pollutants to clean the surface [ 8 , 9 , 10 ]. The gas constitutes a large volume fraction of the foam, resulting in rapid decrease in the amount of liquid after defoaming, and reducing the cost of waste liquid treatment [ 8 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Fatty Alcohols with Different Chain Lengths on the Performance of Low pH Biomass-Based Foams for Radioactive Decontamination

Zhang

Liang

Xi³

et al. 2022

Molecules

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Compared with polymers and nanoparticles, fatty alcohols can not only increase the stability of foam, but also maintain better foamability at pH < 2, which is beneficial to reduce waste liquid and increase decontamination efficiency for radioactive surface pollution. However, different fatty alcohols have different hydrophobic chain lengths. The effects of fatty alcohols with different chain lengths on the performance of decontamination foam were studied at pH < 2, to assist in the selection of suitable fatty alcohols as foam stabilizers. Combined with betaine surfactant and phytic acid, biomass-based foams were synthesized using fatty alcohols with different chain lengths. When the hydrophobic tail groups of the fatty alcohol and the surfactant were the same, the foam showed the best performance, including the lowest surface tension, the highest liquid film strength, the greatest sag-resistance and the best stability. However, when the hydrophobic tail groups were different, the space between adjacent surface active molecules was increased by thermal motion of the excess terminal tail segments (a tail-wagging effect), and the adsorption density reduced on the gas-liquid interface, leading to increased surface tension and decreased liquid film strength, sag-resistance and stability. The use of decontamination foam stabilized by fatty alcohols with the same hydrophobic group as the surfactant was found to increase the decontamination rate of radioactive uranium pollution from 64 to over 90% on a vertical surface.

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“…Amphiphilic molecules such as surfactants play a significant role in diverse processes including emulsification, foaming, − interfacial property modification, − excipient formulation, , drug delivery, , environmental remediation, , and oil recovery. , While surfactants have hydrophobic and hydrophilic regions, their structural details vary. Surfactant headgroups generally fall into two classes: charged (i.e., anionic or cationic) and uncharged (i.e., nonionic or zwitterionic) .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

et al. 2022

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Developing the knowledge on surfactant interfacial phenomena is highly valuable for the advancement of technological, commercial, and industrial products, as these applications often rely on interfacial and colloidal chemistry. Zwitterionic surfactants are a less toxic alternative to standard charged surfactants. With both positively charged quaternary ammonium and negatively charged sulfonate constituents, zwitterionic DDAPS can have diverse interfacial interactions with various coadditives. In this work, we investigate DDAPS adsorption to a planar oil/water interface and its stabilization of oil-in-water nanoemulsions. By studying both interfacial geometries with surface-specific, nonlinear spectroscopy, we gain deeper insights and a molecular perspective into DDAPS’s behavior in the presence of various salts and cosurfactants. From an application standpoint, zwitterionic surfactants are often mixed with other chemicals or used in an environment with pre-existing chemicals (e.g., ocean water during oil remediation). Thus, it is important to understand how such coadditives alter DDAPS’s behavior and its performance as an emulsifier. Our results show that DDAPS is nearly uninfluenced by coadditives at a planar oil/water interface, but the identical coadditives are crucial for DDAPS to form and stabilize nanoemulsions. Additionally, the surfactant packing properties vary between interfaces as well as coadditives, indicating that certain interactions with the DDAPS headgroup are stronger and play a greater role in tuning DDAPS’s interfacial behavior.

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Stabilizing decontamination foam using surface-modified silica nanoparticles containing chemical reagent: foam stability, structures, and dispersion properties

Abstract: The stabilization of decontamination foams containing a chemical reagent is a crucial requirement for their use in the decontamination of nuclear power plants.

Cited by 18 publications

References 61 publications

Spectral Properties of Foams and Emulsions

Spectral Properties of Foams and Emulsions

Effects of Fatty Alcohols with Different Chain Lengths on the Performance of Low pH Biomass-Based Foams for Radioactive Decontamination

Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

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