Ice-VII-like molecular structure of ambient water nanomeniscus

Shin, Dongha; Hwang, Jonggeun; Jhe, Wonho

doi:10.1038/s41467-019-08292-0

Cited by 40 publications

(33 citation statements)

References 48 publications

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“…The intensity of the component at 3400 cm −1 becomes stronger than that at 3200 cm −1 . In this form the enhanced Raman signal is very similar to other results reported for the resonance water spectrum [ 34 ]. Moreover, in the case of the AgNPs blue sample, the excitation laser light is absorbed much more strongly than in pure water or in the AgNPs yellow sample.…”

Section: Resultssupporting

confidence: 89%

“…3400 cm −1 present in the OH stretching vibration region. Additional factors, such as confinement effects or the presence of some solutes, are common in the research of the SERS effect of water [ 33 – 34 ]. In our previous work, we compared, for the first time, spontaneous and stimulated Raman surface enhancement of the signal of liquid water in an aqueous dispersion of silver nanoparticles [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

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Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Filipczak¹,

Hałagan²,

Ulański³

et al. 2021

Beilstein J. Nanotechnol.

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The resonance Raman effect (RRE) is a phenomenon which results in a strong selective enhancement of Raman signals from the samples. Previous studies showed that the RRE in liquid water directly corresponds to its supramolecular structure. It was also reported that the electric-field-induced orientation of water molecules on the electrode surface results in the surface-enhanced Raman scattering (SERS) effect. In this work, we show the SERS effect for water molecules in the dispersion of silver nanoparticles (AgNPs) without any external electrical field. An enhancement factor was estimated to be (4.8 ± 0.8) × 106 for an excitation wavelength of 514.5 nm and for AgNPs with an average size of 34 ± 14 nm. The temperature experiment results showed a higher enhancement with temperature increase. Performed simulation studies revealed a slowdown of the mobility of the water molecules close to the surface of AgNPs.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Filipczak¹,

Hałagan²,

Ulański³

et al. 2021

Beilstein J. Nanotechnol.

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“…because of difficulties in creating the required atomic-scale confinement 1,10,12 , the varying thickness of wetting films 1,2,[7][8][9][10][11][12][13]17 and huge capillary pressures that can cause considerable deformations 13,[23][24][25] . As for theory, the Kelvin equation is also believed to reach its applicability limit for confinement containing a few molecular layers because, at this smallest scale, the properties of water notably change 2,3,12,15,16 and the description in terms of homogeneous macroscopic thermodynamics becomes questionable 1-4,16-20 , leaving aside the fact that such quantities as d and θ in equation 1 can no longer be defined [1][2][3][18][19][20] .…”

mentioning

confidence: 99%

Capillary condensation under atomic-scale confinement

Yang

Sun

Fumagalli

et al. 2020

Nature

218

146

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Capillary condensation of water is ubiquitous in nature and technology. It routinely occurs in granular and porous media, can strongly alter such properties as adhesion, lubrication, friction and corrosion, and is important in many processes employed by microelectronics, pharmaceutical, food and other industries [1][2][3][4] . The century-old Kelvin equation 5 is commonly used to describe condensation phenomena and shown to hold well for liquid menisci with diameters as small as several nm [1][2][3][4][6][7][8][9][10][11][12][13][14] . For even smaller capillaries that are involved in condensation under ambient humidity and so of particular practical interest, the Kelvin equation is expected to break down because the required confinement becomes comparable to the size of water molecules . Here we take advantage of van der Waals assembly of two-dimensional crystals to create atomic-scale capillaries and study condensation inside. Our smallest capillaries are less than 4 Å in height and can accommodate just a monolayer of water. Surprisingly, even at this scale, the macroscopic Kelvin equation using the characteristics of bulk water is found to describe accurately the condensation transition in strongly hydrophilic (mica) capillaries and remains qualitatively valid for weakly hydrophilic (graphite) ones. We show that this agreement is somewhat fortuitous and can be attributed to elastic deformation of capillary walls [23][24][25] , which suppresses giant oscillatory behavior expected due to commensurability between atomic-scale confinement and water molecules 20,21 . Our work provides a much-needed basis for understanding of capillary effects at the smallest possible scale important in many realistic situations.The Kelvin equation predicts that capillaries become spontaneously filled with water at the relative humidity RHK = exp (-2σ/kBTdρN)where σ ≈ 73 mJ m -2 is the surface tension of water at room temperature T, ρN ≈ 3.3×10 28 m -3 is the number density of water, kB is the Boltzmann constant, and d is the diameter of the meniscus curvature. For a two-dimensional (2D) confinement created by parallel walls separated by a distance h, d = h/cos(θ) where θ is the contact angle of water on the walls' material. For capillary condensation to occur at relative humidity (RH) considerably below 100%, equation 1 dictates that d must be comparable to 2σ/kBTρN ≈ 1.1 nm. For example, under typical ambient RH of 40-50%, water is expected to condense in slits with h < 1.5 nm and cylindrical pores with diameters < 3 nm, if θ is close to zero. Even stronger confinement is required for capillaries involving less hydrophilic materials. So far, a broad consensus has been reached that the Kelvin equation remains accurate for menisci with d ≥ 8 nm [1][2][3][4][6][7][8][9][10][11] and can also describe condensation phenomena in hydrophilic pores as small as 4 nm in diameter 12-14 . To achieve agreement with the experiments at this scale, the Kelvin equation is usually modified to account for so-called wetting films that are adsorbed on...

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“…4 c, the Raman intensity vs. the number of particles is linearly well fitted, which indicates that the Au nanoparticles of the results demonstrate the SERS effect. Nanoparticles are widely used to make SERS samples using the coffee-ring effect [ 35 ], or other complicated processes [ 36 ]. Using the DEPQA system, one can make the SERS platform of enriched nanoparticles efficiently and control the SERS activity with the amount of solution in a very small area.…”

Section: Resultsmentioning

confidence: 99%

Sorting Gold and Sand (Silica) Using Atomic Force Microscope-Based Dielectrophoresis

et al. 2021

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Additive manufacturing–also known as 3D printing–has attracted much attention in recent years as a powerful method for the simple and versatile fabrication of complicated three-dimensional structures. However, the current technology still exhibits a limitation in realizing the selective deposition and sorting of various materials contained in the same reservoir, which can contribute significantly to additive printing or manufacturing by enabling simultaneous sorting and deposition of different substances through a single nozzle. Here, we propose a dielectrophoresis (DEP)-based material-selective deposition and sorting technique using a pipette-based quartz tuning fork (QTF)-atomic force microscope (AFM) platform DEPQA and demonstrate multi-material sorting through a single nozzle in ambient conditions. We used Au and silica nanoparticles for sorting and obtained 95% accuracy for spatial separation, which confirmed the surface-enhanced Raman spectroscopy (SERS). To validate the scheme, we also performed a simulation for the system and found qualitative agreement with the experimental results. The method that combines DEP, pipette-based AFM, and SERS may widely expand the unique capabilities of 3D printing and nano-micro patterning for multi-material patterning, materials sorting, and diverse advanced applications. "Image missing"

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Ice-VII-like molecular structure of ambient water nanomeniscus

Cited by 40 publications

References 48 publications

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Capillary condensation under atomic-scale confinement

Sorting Gold and Sand (Silica) Using Atomic Force Microscope-Based Dielectrophoresis

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