Enhancement of the Hydrogen-Bonding Network of Water Confined in a Polyelectrolyte Brush

Yamazoe, Kazuaki; Higaki, Yasuki; Inutsuka, Yoshihiro; Miyawaki, Jun; Cui, Yi‐Tao; Takahara, Atsushi; Harada, Yoshihisa

doi:10.1021/acs.langmuir.7b00243

Cited by 52 publications

(49 citation statements)

References 46 publications

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“…For example, it was proven that the local structure of water reorganizes in the vicinity of polyelectrolyte brushes, leading to an enhancement of the hydrogen-bond network. 49 Furthermore, a similar effect on the methanol liquid structure can be obtained by playing with temperature and pressure. 50 This kind of effect might be exploited similarly to how LiCl has been used in our work.…”

Section: Discussionmentioning

confidence: 81%

Tuning Solvent Miscibility: A Fundamental Assessment on the Example of Induced Methanol/n-Dodecane Phase Separation

et al. 2019

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In this work, we assess the fundamental aspects of mutual miscibility of solvents by studying the mixing of two potential candidates, methanol and n -dodecane, for nonaqueous solvent extraction. To do so, 1 H NMR spectroscopy and molecular dynamics simulations are used jointly. The NMR spectra show that good phase separation can be obtained by adding LiCl and that the addition of a popular extractant (tri- n -butyl phosphate) yields the opposite effect. It is also demonstrated that in a specific case the poor phase separation is not due to the migration of n -dodecane into the more polar phase, but due to the transfer of the extractant into it, which is especially relevant when considering industrial applications of solvent extraction. With the aid of molecular dynamics simulations, explanations of this behavior are given. Specifically, an increase of all hydrogen-bond lifetimes is found to be consequent to the addition of LiCl which implies an indirect influence on the methanol liquid structure, by favoring a stronger hydrogen-bond network. Therefore, we found that better phase separation is not directly due to the presence of LiCl, but due to the “hardening” of the hydrogen-bond network.

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Section: Discussionmentioning

confidence: 81%

Tuning Solvent Miscibility: A Fundamental Assessment on the Example of Induced Methanol/n-Dodecane Phase Separation

et al. 2019

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“…Compared with bulk water, bound water exhibits unique structural properties, including difficulty freezing, difficult separation, and restricted mobility and solubility, which endow it with unique applications 36 , 40 , 41 . A recent study 42 indicated that the bound water confined in a polyelectrolyte brush exhibited a tight arrangement with a high density, which greatly enhanced the hydrogen-bonded network. The strong hydrogen-bonding structures of water in swollen polymer brushes have been reported to suppress protein adsorption, affording biocompatibility 43 .…”

Section: Introductionmentioning

confidence: 99%

Induction of long-lived room temperature phosphorescence of carbon dots by water in hydrogen-bonded matrices

et al. 2018

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Phosphorescence shows great potential for application in bioimaging and ion detection because of its long-lived luminescence and high signal-to-noise ratio, but establishing phosphorescence emission in aqueous environments remains a challenge. Herein, we present a general design strategy that effectively promotes phosphorescence by utilising water molecules to construct hydrogen-bonded networks between carbon dots (CDs) and cyanuric acid (CA). Interestingly, water molecules not only cause no phosphorescence quenching but also greatly enhance the phosphorescence emission. This enhancement behaviour can be explained by the fact that the highly ordered bound water on the CA particle surface can construct robust bridge-like hydrogen-bonded networks between the CDs and CA, which not only effectively rigidifies the C=O bonds of the CDs but also greatly enhances the rigidity of the entire system. In addition, the CD-CA suspension exhibits a high phosphorescence lifetime (687 ms) and is successfully applied in ion detection based on its visible phosphorescence.

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“…We investigated the unique water structure confined in polyelectrolyte brushes by synchrotron-based soft X-ray absorption and emission spectroscopies (XAS and XES, respectively) [ 42 ]. XAS and XES yield element-specific unoccupied and occupied electronic structures to show the local symmetry of hydrogen bonding.…”

Section: X-ray Spectroscopymentioning

confidence: 99%

“…( b ) Soft X-ray absorption spectra of water confined in the polyelectrolyte brush, dry brush measured in vacuum, liquid H 2 O at room temperature, and I h ice. Reproduced with permission [ 42 ]. 2017, American Chemical Society.…”

Section: Figurementioning

confidence: 99%

Application of Synchrotron Radiation X-ray Scattering and Spectroscopy to Soft Matter

et al. 2020

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Light produced by synchrotron radiation (SR) is much brighter than that produced by conventional laboratory X-ray sources. The photon energy of SR X-ray ranges from soft and tender X-rays to hard X-rays. Moreover, X-rays become element sensitive with decreasing photon energy. By using a wide energy range and high-quality light of SR, different scattering and spectroscopic methods were applied to various soft matters. We present five of our recent studies performed using specific light properties of a synchrotron facility, which are as follows: (1) In situ USAXS study to understand the deformation behavior of colloidal crystals during uniaxial stretching; (2) structure characterization of semiconducting polymer thin films along the film thickness direction by grazing-incidence wide-angle X-ray scattering using tender X-rays; (3) X-ray absorption fine structure (XAFS) analysis of the formation mechanism of poly(3-hexylthiophene) (P3HT); (4) soft X-ray absorption and emission spectroscopic analysis of water structure in polyelectrolyte brushes; and (5) X-ray photon correlation spectroscopic analysis of the diffusion behavior of polystyrene-grafted nanoparticles dispersed in a polystyrene matrix.

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Enhancement of the Hydrogen-Bonding Network of Water Confined in a Polyelectrolyte Brush

Cited by 52 publications

References 46 publications

Tuning Solvent Miscibility: A Fundamental Assessment on the Example of Induced Methanol/n-Dodecane Phase Separation

Tuning Solvent Miscibility: A Fundamental Assessment on the Example of Induced Methanol/n-Dodecane Phase Separation

Induction of long-lived room temperature phosphorescence of carbon dots by water in hydrogen-bonded matrices

Application of Synchrotron Radiation X-ray Scattering and Spectroscopy to Soft Matter

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