Unusual buffer action of free-standing nanoscopically confined water

Liao, Kylin; Xu, Xiaolong; Du, Xuezhong

doi:10.1016/j.jcis.2009.09.063

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…For instance, the nanoconfined water could act as buffer media in response to the external pH change, because the low dielectric constant of the nanoconfined water in interface layer favors the presence of hydrogen or hydroxide ion as the form of ion pairs (bottom of Figure 4c). 132 One thus could expect a stronger chemical stability of active nanoparticles inside the nanoconfinement for environmental application. However, when confined between 2D FeS mackinawite interlayers, the dissociation extent of water increases by 2 orders of magnitude because of the increase of water dielectric constant.…”

Section: On the Fundamentals Of Nanoconfined Water And Implications F...mentioning

confidence: 99%

“…From the perspective of the anomalous dielectric constant of nanoconfined water, its unique electric polarizability should affect the water-mediated intermolecular forces, and thus, result in a change of ion solubility , and even the thermodynamics of chemical reaction. For instance, the nanoconfined water could act as buffer media in response to the external pH change, because the low dielectric constant of the nanoconfined water in interface layer favors the presence of hydrogen or hydroxide ion as the form of ion pairs (bottom of Figure c) . One thus could expect a stronger chemical stability of active nanoparticles inside the nanoconfinement for environmental application.…”

Section: On the Fundamentals Of Nanoconfined Water And Implications F...mentioning

confidence: 99%

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Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Qian

Gao

Pan

2020

Environ. Sci. Technol.

257

113

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Safe and clean water is of pivotal importance to all living species and the ecosystem on earth. However, the accelerating economy and industrialization of mankind generate water pollutants with much larger quantity and higher complexity than ever before, challenging the efficacy of traditional water treatment technologies. The flourishing researches on nanomaterials and nanotechnologies in the past decade have generated new understandings on many fundamental processes and brought revolutionary upgrades to various traditional technologies in almost all areas, including water treatment. An indispensable step toward the real application of nanomaterials in water treatment is to confine them in large processable substrate to address various inherent issues, such as spontaneous aggregation, difficult operation and potential environmental risks. Strikingly, when the size of the spatial restriction provided by the substrate is on the order of only one or several nanometers, referred to as nanoconfinement, the phase behavior of matter and the energy diagram of a chemical reaction could be utterly changed. Nevertheless, the relationship between such changes under nanoconfinement and their implications for water treatment is rarely elucidated systematically. In this Critical Review, we will briefly summarize the current state-of-the-art of the nanomaterials, as well as the nanoconfined analogues (i.e., nanocomposites) developed for water treatment. Afterward, we will put emphasis on the effects of nanoconfinement from three aspects, that is, on the structure and behavior of water molecules, on the formation (e.g., crystallization) of confined nanomaterials, and on the nanoenabled chemical reactions. For each aspect, we will build the correlation between the nanoconfinement effects and the current studies for water treatment. More importantly, we will make proposals for future studies based on the missing links between some of the nanoconfinement effects and the water treatment technologies. Through this Critical Review, we aim to raise the research attention on using nanoconfinement as a fundamental guide or even tool to advance water treatment technologies.

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Section: On the Fundamentals Of Nanoconfined Water And Implications F...mentioning

confidence: 99%

Section: On the Fundamentals Of Nanoconfined Water And Implications F...mentioning

confidence: 99%

Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Qian

Gao

Pan

2020

Environ. Sci. Technol.

257

113

View full text Add to dashboard Cite

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“…Water is ubiquitous in metal oxide nanoparticle systems, and its presence on the surface of such particles affects their stability at the nanoscale . Yet, significant differences in the structure, dynamics, dissolution properties, and liquid–solid phase transition temperature for confined water relative to bulk liquid water have been reported, demonstrating that water confined to nanoscale domains exhibits unique physical and chemical properties. − Consequently, if one is to obtain a comprehensive understanding of the surface chemistry of nanoparticle systems, it is imperative that the thermodynamic properties of the surface hydration layers be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Size and Water Coverage on the Thermodynamic Properties of Water Confined on the Surface of SnO₂ Cassiterite Nanoparticles

et al. 2011

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“…A cuvette with two CaF 2 windows as the infrared beam path is used. Conversion of absorbance at 3400 cm –1 into water core thickness is based on the work of Liao et al Figure shows the infrared spectrum of a NBF formed by the “stock solution” (without formaldehyde). The features within 2850–3000 cm –1 are from the C–H stretching vibration .…”

Section: Methodsmentioning

confidence: 99%

Nanometer-Thick Newton Black Film for Selective Formaldehyde Gas Detection

Zhang

2018

Anal. Chem.

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A fluorescence spectroscopic assay using Newton black film (NBF) for sensitive and selective detection of gaseous formaldehyde at room temperature is reported. The method relies on the Hantzsch reaction of formaldehyde with ammonium citrate and acetylacetone, plus a combination of the large surface area-to-volume ratio (5 × 10 m) and efficient uptake of gas by the nanometer-thick aqueous core of NBF. The assay has a limit of detection (LOD) of 4 ppb, a linear signal-to-concentration correlation up to 300 ppb of HCHO gas in the air, and a nonlinear monotonic increasing correlation in the range of 300 ppb to 1.2 ppm. It is unaffected by relevant analytes such as acetaldehyde, benzaldehyde, acetone, and propionaldehyde. We also demonstrate the sensing of formaldehyde outgassing from a plywood sample using this method and the results agree with the factory specifications.

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Unusual buffer action of free-standing nanoscopically confined water

Cited by 8 publications

References 25 publications

Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Influence of Particle Size and Water Coverage on the Thermodynamic Properties of Water Confined on the Surface of SnO₂ Cassiterite Nanoparticles

Nanometer-Thick Newton Black Film for Selective Formaldehyde Gas Detection

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Unusual buffer action of free-standing nanoscopically confined water

Cited by 8 publications

References 25 publications

Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Nanoconfinement-Mediated Water Treatment: From Fundamental to Application

Influence of Particle Size and Water Coverage on the Thermodynamic Properties of Water Confined on the Surface of SnO2 Cassiterite Nanoparticles

Nanometer-Thick Newton Black Film for Selective Formaldehyde Gas Detection

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Product

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Influence of Particle Size and Water Coverage on the Thermodynamic Properties of Water Confined on the Surface of SnO₂ Cassiterite Nanoparticles