Positive Charge-doping on Carbon Nanotube Walls and Anion-directed Tunable Dispersion of the Derivatives

Shin, U–Cheul; Knowles, Jonathan C.; Kim, Hae‐Won

doi:10.5012/bkcs.2011.32.5.1635

Cited by 8 publications

(8 citation statements)

References 24 publications

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“…Generally, CNT molecules are highly hydrophobic and structurally stable in their pristine state, making them impossible to disperse in most experimental solvents 35. To solve this problem, our group has recently developed a new method of modifying CNTs 39. The sidewalls of pristine CNTs were chemically modified to retain a positive charge by means of first opening the ring of THF with Lewis‐acidic ionic liquid [bmim][Sb 2 F 11 ] ([bmim] = 1‐butyl‐3‐methylimidazolium), followed by CNT alkylation with the strongly electrophilic THF, allowing to provide sidewalls a bunch of positive charge doping.…”

Section: Resultsmentioning

confidence: 99%

“…35 To solve this problem, our group has recently developed a new method of modifying CNTs. 39 The sidewalls of pristine CNTs were chemically modified to retain a positive charge by means of first opening the ring of THF with Lewis-acidic ionic liquid…”

Section: Resultsmentioning

confidence: 99%

“…The preparation of imCNTs bearing anion Cl has been described in detail in our previous works. 39 In brief, pristine CNTs (pCNTs; multiwalled; ILJIN Nanotech, Korea) were mixed with [bmim][Sb 2 F 11 ] in dichloromethane (DCM) under Ar gas, followed by the addition of tetrahydrofuran (THF) and quenching in water. After filtering, washing with acetone and DCM, and drying in a vacuum, CNT-SbF 6 was obtained as an air-stable black powder.…”

Section: Ionically Modified Cnts (Imcnts)mentioning

confidence: 99%

“…We recently exploited one effective method of modifying CNTs by introducing a positive charge onto their surface. This modified form consists of a positively charged CNT derivative and anionic counterpart in the form of [CNT] + Cl − or [CNT] + SbF 6 − 38, 39. These ionically modified CNTs ( im CNTs) were shown to dissolve smoothly in a range of solutions, including tetrahydrofuran (THF) and dichloromethane (DCM), without agglomeration; these are also solvents competent to dissolve synthetic biopolymers like PCL.…”

Section: Introductionmentioning

confidence: 99%

“…This modified form consists of a positively charged CNT derivative and anionic counterpart in the form of [CNT] þ Cl À or [CNT] þ SbF 6 À . 38,39 These ionically modified CNTs (imCNTs) were shown to dissolve smoothly in a range of solutions, including tetrahydrofuran (THF) and dichloromethane (DCM), without agglomeration; these are also solvents competent to dissolve synthetic biopolymers like PCL. Therefore, it is considered that the CNT molecules can be effectively mixed with biopolymers by a simple solvent approach, consequently enabling the production of homogeneous CNT/polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Robocasting nanocomposite scaffolds of poly(caprolactone)/hydroxyapatite incorporating modified carbon nanotubes for hard tissue reconstruction

Dorj

Won

Kim

et al. 2012

J Biomedical Materials Res

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Nanocomposite scaffolds with tailored 3D pore configuration are promising candidates for the reconstruction of bone. Here we fabricated novel nanocomposite bone scaffolds through robocasting. Poly(caprolactone) (PCL)-hydroxyapatite (HA) slurry containing ionically modified carbon nanotubes (imCNTs) was robotic-dispensed and structured layer-by-layer into macrochanneled 3D scaffolds under adjusted processing conditions. Homogeneous dispersion of imCNTs (0.2 wt % relative to PCL-HA) was achieved in acetone, aiding in the preparation of PCL-HA-imCNTs slurry with good mixing property. Incorporation of imCNTs into PCL-HA composition significantly improved the compressive strength and elastic modulus of the robotic-dispensed scaffolds (~1.5-fold in strength and ~2.5-fold in elastic modulus). When incubated in simulated body fluid (SBF), PCL-HA-imCNT nanocomposite scaffold induced substantial mineralization of apatite in a similar manner to the PCL-HA scaffold, which was contrasted in pure PCL scaffold. MC3T3-E1 cell culture on the scaffolds demonstrated that cell proliferation levels were significantly higher in both PCL-HA-imCNT and PCL-HA than in pure PCL, and no significant difference was found between the nanocomposite scaffolds. When the PCL-HA-imCNT scaffold was implanted into a rat subcutaneous tissue for 4 weeks, soft fibrous tissues with neo-blood vessels formed well in the pore channels of the scaffolds without any significant inflammatory signs. Tissue reactions in PCL-HA-imCNT scaffold were similar to those in PCL-HA scaffold, suggesting incorporated imCNT did not negate the beneficial biological roles of HA. While more long-term in vivo research in bone defect models is needed to confirm clinical availability, our results suggest robotic-dispensed PCL-HA-imCNT nanocomposite scaffolds can be considered promising new candidate matrices for bone regeneration.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Ionically Modified Cnts (Imcnts)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Robocasting nanocomposite scaffolds of poly(caprolactone)/hydroxyapatite incorporating modified carbon nanotubes for hard tissue reconstruction

Dorj

Won

Kim

et al. 2012

J Biomedical Materials Res

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Production of Carbonaceous Materials with Various Lengths in Small Spheroidal Fullerenes and Long CNTs by Tunable Multi‐walled Carbon Nanotube Cutting

Kim

Shin

2016

Bulletin Korean Chem Soc

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Tunable cutting of multi-walled carbon nanotubes (CNTs) using high pressure homogenizer and/or HNO 3 /H 2 SO 4 solution was accomplished, resulting in the production of short CNTs with minimum length of 35 nm. Field emission scanning electron microscopy (FE-SEM) and Zeta sizer analysis showed significant reduction of CNT length from this tunable cutting (e.g. from long and entangled pristine CNTs at about 20 μm to ≥1000 nm,~400 nm,~200 nm, and~100 nm via high pressure jet-spraying cutting within 5 h, while chemical cutting process using greatly longer hours (48 h) showed a reduction only to about 1000 nm). When CNT sample of average 1000 nm length previously shortened by HNO 3 /H 2 SO 4 was subjected to the high pressure jet-spraying cutting process, the reduction progressed faster (≤1 h), producing ≥35 nm. Fourier transform infrared spectra and thermogravimetric analysis (TGA) indicated restricted formation of hydrophilic functional groups such as carboxylic group and hydroxyl group in the high pressure jet-spraying cutting, whereas an intensive formation of hydrophilic functional groups on the surface of shortened CNT samples was found after chemical cutting. Such short CNT samples would fulfill the requirements for carbonaceous materials with various lengths in small spheroidal fullerenes and long CNTs. The short CNTs produced are promising for scientific and technological applications in many fields such as electronics, diagnostics, pharmaceuticals, biomedical engineering, and environmental or energy industries.

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Ruthenium oxide–carbon-based nanofiller-reinforced conducting polymer nanocomposites and their supercapacitor applications

Ateş

Fernandez

2018

Polym. Bull.

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In this review article, we have presented for the first time the new applications of supercapacitor technologies and working principles of the family of RuO 2-carbon-based nanofiller-reinforced conducting polymer nanocomposites. Our review focuses on pseudocapacitors and symmetric and asymmetric supercapacitors. Over the last years, the supercapacitors as a new technology in energy storage systems have attracted more and more attention. They have some unique characteristics such as fast charge/discharge capability, high energy and power densities, and long stability. However, the need for economic, compatible, and easy synthesis materials for supercapacitors have led to the development of RuO 2-carbon-based nanofillerreinforced conducting polymer nanocomposites with RuO 2. Therefore, the aim of this manuscript was to review RuO 2-carbon-based nanofiller-reinforced conducting polymer nanocomposites with RuO 2 over the last 17 years.

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Positive Charge-doping on Carbon Nanotube Walls and Anion-directed Tunable Dispersion of the Derivatives

Cited by 8 publications

References 24 publications

Robocasting nanocomposite scaffolds of poly(caprolactone)/hydroxyapatite incorporating modified carbon nanotubes for hard tissue reconstruction

Robocasting nanocomposite scaffolds of poly(caprolactone)/hydroxyapatite incorporating modified carbon nanotubes for hard tissue reconstruction

Production of Carbonaceous Materials with Various Lengths in Small Spheroidal Fullerenes and Long CNTs by Tunable Multi‐walled Carbon Nanotube Cutting

Ruthenium oxide–carbon-based nanofiller-reinforced conducting polymer nanocomposites and their supercapacitor applications

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