Imidazolium Ion-Terminated Self-Assembled Monolayers on Au:  Effects of Counteranions on Surface Wettability

Lee, Bang Sook; Shik, Young; Lee, Jae Yeol; Choi, Insung S.; Song, Choong Eui; Namgoong, Sung Keon; Lee, Sang Gi

doi:10.1021/ja038405h

Cited by 229 publications

(135 citation statements)

References 31 publications

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“…From Figure 2a, the size of CNT aggregates is about 30-50 µm, however there is no obvious CNT aggregates in Figure 2b. The imidazolium-functionalized CNTs bearing hydrophilic Chlorine anion were found to convert the hydrophobic surface of CNT to hydrophilic 40,41 . After screening various solvent systems, a mixture of ethanol and acetone (3:1, v/v) was found to favor the uniform dispersion of the CNTs-IL.…”

Section: Resultsmentioning

confidence: 99%

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Wang¹,

Colorado

Guo

et al. 2012

Mat. Res.

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A brand-new type of multifunctional nanocomposites with high DC conductivity and enhanced mechanical strength was fabricated. Ionic liquid functionalized Carbon Nanotubes (CNTs-IL) were embedded into epoxy matrix with covalent bonding by the attached epoxy groups. The highest DC conductivity was 8.38 × 10 -3 S.m -1 with 1.0 wt. (%) loading of CNTs-IL and the tensile strength was increased by 36.4% only at a 0.5 wt. (%) concentration. A mixing solvent was used to disperse CNTs-IL in the epoxy monomer. The dispersion and distribution of CNTs-IL in the polymer matrix were measured by utilizing both optical microscopy and scanning electron microscopy, respectively.

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Section: Resultsmentioning

confidence: 99%

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Wang¹,

Colorado

Guo

et al. 2012

Mat. Res.

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“…Due to the extremely low vapor pressures and the interesting transport as well as electrochemical properties of this material class, ILs were used as reaction media, [1,2] as electrolytes in batteries and supercapacitors, [3][4][5][6][7] in solar and fuel cells, [8][9][10][11][12][13] for electrochemical deposition of metals and semiconductors, [14] as additives for stabilizing proteins, [15] for liquid-liquid extractions [16] and in nanoscience. [17][18][19] The fundamental physical properties (e.g. melting point, viscosity, conductivity, density etc.)…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Viscosity and Conductivity of Mildly Functionalized and Non‐Functionalized [Tf₂N]⁻ Ionic Liquids

et al. 2011

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A series of bis(trifluoromethylsulfonyl)imide ionic liquids (ILs) with classical as well as mildly functionalized cations was prepared and their viscosities and conductivities were determined as a function of the temperature. Both were analyzed with respect to Arrhenius, Litovitz and Vogel-Fulcher-Tammann (VFT) behaviors, as well as in the context of their molecular volume (V(m)). Their viscosity and conductivity are highly correlated with V(m)/T or related expressions (R(2) ≥0.94). With the knowledge of V(m) of new cations, these correlations allow the temperature-dependent prediction of the viscosity and conductivity of hitherto unknown, non- or mildly functionalized ILs with low error bars (0.05 and 0.04 log units, respectively). The influence of the cation structure and mild functionalization on the physical properties was studied with systematically altered cations, in which V(m) remained similar. The T(o) parameter obtained from the VFT fits was compared to the experimental glass temperature (T(g)) and the T(g)/T(o) ratio for each IL was calculated using both experimental values and Angell's relationship. With Walden plots we investigated the IL ionicity and interpreted it in relation to the cation effects on the physical IL properties. We checked the validity of these V(m)/T relations by also including the recently published variable temperature viscosity and conductivity data of the [Al(OR(F))(4)](-) ILs with R(F) =C(H)(CF(3))(2) (error bars for the prediction: 0.09 and 0.10 log units, respectively).

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“…In 2004, Choi et al prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and In order to elaborate reversible superhydrophobic properties by ion exchange, gold micro and nanostructured substrates were performed by electroless etching process by immersing silicon substrates in aqueous solution of HAuCl 4 and HF (Figure 2).…”

Section: Ion Exchangementioning

confidence: 99%

“…In 2004, Choi et al prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and they found that the surface hydrophobicity increases like this: Br The substituent has also an important influence on the surface wettability [3,4].…”

Section: Ion Exchangementioning

confidence: 99%

Switchable and Reversible Superhydrophobic Surfaces: Part Two

Taleb¹,

Darmanin²,

Guittard³

2018

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

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In this book chapter, most of the methods used in the literature to prepare switchable and reversible superhydrophobic surfaces are described. Inspired by Nature, it is possible to induce the Cassie-Baxter-Wenzel transition using different external stimuli such as light, temperature, pH, ion exchange, voltage, magnetic field, mechanic stress, plasma, ultrasonication, solvent, gas or guest. Such properties are extremely important for various applications but especially for controllable oil/water separation membranes, oil-absorbing materials, and water harvesting systems.Keywords: superhydrophobic, reversible, switchable, bioinspiration, biomimetism Reversible superhydrophobic surfaces: Part twoThis section provides continuation of the description of the stimuli used in the literature to induce reversible changes in surface wettability. Ion exchangeSince 2004, the researchers have shown that the presence of charged species such as quaternary ammonium groups are sensitive to ion exchange and lead to different surface wettabilities. In 2004, Choi et al. prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and In order to elaborate reversible superhydrophobic properties by ion exchange, gold micro and nanostructured substrates were performed by electroless etching process by immersing silicon substrates in aqueous solution of HAuCl 4 and HF (Figure 2). The surface was then modified by SAM using a thiol terminated by a quaternary ammonium. Then, the surface wettability could be reversely changed from superhydrophilic to superhydrophobic after [20]. Here, the presence of TSPM (sol-gel precursor) was used not only to form a polymer network via intramolecular interactions but also to anchor substrates (Figure 3). The membranes could reversely change from superhydrophobic/highly oleophobic to superhydrophilic/superoleophobic after exchanging Cl − ions by heptadecafluorooctanesulfonic acid (C 8 F 17 SO 3 − or HPS − ) ions. Moreover, the membranes were also highly efficient filter medium for removing multiple contaminants such as SO 2 form waster gas streams. A nother strategy was to deposit polyelectrolyte multilayers poly(diallyldimethylammonium chloride (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) on gold micro and nanostructured substrates [21]. The authors studied the influence of the exchanged ions and the highest properties were obtained by exchanging Cl − (θ w < 5°) ions by PFO − (θ w = 164°). The authors also deposited polyelectrolyte multilayers on micro and nanostructured aluminum substrates obtained by etching in HCl and immersion in boiling water [22,23]. Using PFO − ions, the substrates were superhydrophobic and superoleophobic. When the substrates were immersed in seawater, the PFO − ions were exchanged by hydrophilic Cl − or SO 4 2− making the substrates underwater superoleophobic. Magnetic fieldEnvironment protection against oil leakage during oil tankers sinking is ...

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Imidazolium Ion-Terminated Self-Assembled Monolayers on Au: Effects of Counteranions on Surface Wettability

Cited by 229 publications

References 31 publications

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Temperature Dependence of the Viscosity and Conductivity of Mildly Functionalized and Non‐Functionalized [Tf₂N]⁻ Ionic Liquids

Switchable and Reversible Superhydrophobic Surfaces: Part Two

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Imidazolium Ion-Terminated Self-Assembled Monolayers on Au: Effects of Counteranions on Surface Wettability

Cited by 229 publications

References 31 publications

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Effective functionalization of carbon nanotubes for bisphenol F epoxy matrix composites

Temperature Dependence of the Viscosity and Conductivity of Mildly Functionalized and Non‐Functionalized [Tf2N]− Ionic Liquids

Switchable and Reversible Superhydrophobic Surfaces: Part Two

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Temperature Dependence of the Viscosity and Conductivity of Mildly Functionalized and Non‐Functionalized [Tf₂N]⁻ Ionic Liquids