神戸大学附属図書館デジタルアーカイブ
入力補助
English
カテゴリ
学内刊行物
ランキング
アクセスランキング
ダウンロードランキング
https://hdl.handle.net/20.500.14094/90007532
このアイテムのアクセス数:
37
件
(
2024-05-02
06:44 集計
)
閲覧可能ファイル
ファイル
フォーマット
サイズ
閲覧回数
説明
90007532 (fulltext)
pdf
3.40 MB
27
メタデータ
ファイル出力
メタデータID
90007532
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Estimation of solid-liquid interfacial potential enabled by quantitative analysis and relaxation observation of quadrupolar NMR
著者
Maki, Hideshi ; Tachibana, Takashi ; Eun, Song Jung ; Mizuhata, Minoru
著者ID
A0923
研究者ID
1000030283873
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=0254a9fbd8d16dcd520e17560c007669
著者名
Maki, Hideshi
牧, 秀志
マキ, ヒデシ
所属機関名
環境保全推進センター
著者名
Tachibana, Takashi
著者名
Eun, Song Jung
著者ID
A0922
研究者ID
1000010283871
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=bc56357c0d6f0f29520e17560c007669
著者名
Mizuhata, Minoru
水畑, 穣
ミズハタ, ミノル
所属機関名
工学研究科
収録物名
Colloids and Surfaces A: Physicochemical and Engineering Aspects
巻(号)
604
ページ
125286
出版者
Elsevier B.V.
刊行日
2020-11-05
公開日
2022-12-01
抄録
Relaxation time measurements and quantitative analyses of quadrupolar nuclei via NMR were effective for the estimation of the interfacial potential at the solid-liquid interface. Moreover, quantitative nuclear magnetic resonance (qNMR) spectroscopy experiments for 23Na and 35Cl nuclei were performed. The calibration curve of the external standard aqueous NaCl solution showed excellent linearity over a considerably wide concentration range from 4 x 10(-4) to 2 mol L−1 (an increase in concentration of 5000 times), with a simple experimental and analytical procedure. The relaxation time and detection rate of Cl- ions in the 35Cl NMR spectrum of a 0.10 mol L–1 NaCl aq. solution with 10 vol% α-Al2O3 drastically decreased as the zeta potential of the solid phase (ζ(s)) of α-Al2O3 approximated a negative value. Such a result was due to the decrease in both the mobility of Cl– ions and the symmetry of the electrostatic field around 35Cl nuclei caused by the electrostatic interactions between Cl- ions and the solid surface. In the case of Na+ ions, which have a charge opposite to that of Cl- ions, the ζ(s) dependences of the relaxation time and detection rate of Na+ ions of 23Na NMR were also opposite to those of 35Cl NMR. Particularly, such values were almost constant when ζ(s) > 0 mV but decreased monotonically when ζ(s) < 0 mV. It was also clarified that the counterions condensed around the vicinity of the solid phase wherein the concentration of the counterions was approximately several tens of times higher than that in the bulk phase. The estimation of electrostatic field intensities not only at solid-liquid interfaces but also at liquid-liquid interfaces and various interfaces, including those in non-aqueous solvents, can thus be performed through the proposed method.
キーワード
qNMR
Quantitative NMR
23Na NMR
35Cl NMR
Zeta potential
Counterion condensation
カテゴリ
環境保全推進センター
工学研究科
学術雑誌論文
権利
© 2020 Elsevier B.V.
This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
詳細を表示
資源タイプ
journal article
言語
English (英語)
ISSN
0927-7757
OPACで所蔵を検索
CiNiiで学外所蔵を検索
eISSN
1873-4359
OPACで所蔵を検索
CiNiiで学外所蔵を検索
NCID
AA10892561
OPACで所蔵を検索
CiNiiで表示
関連情報
DOI
https://doi.org/10.1016/j.colsurfa.2020.125286
ホームへ戻る