Hydrogen-Bond-Driven Assembly of Thin Multiwalled Carbon Nanotubes

Han, Joong Tark; Kim, Sun Young; Woo, Jong Seok; Jeong, Hee Jin; Oh, Weontae; Lee, Geon-Woong

doi:10.1021/jp804334f

Cited by 20 publications

(19 citation statements)

References 20 publications

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“…In the FTIR spectrum of MWNT–OH, shown in Figure 1, the CO and CO stretching vibrations of ester groups shifted from 1722 cm −1 and 1182 cm −1 to 1738 cm −1 and 1203 cm −1 , respectively, as compared with the same transitions in Figure 1(B) 35, 36. This observation confirmed that the COCl group of MWNT–COCl reacted with ethylene glycol to form MWNT–OH.…”

Section: Resultssupporting

confidence: 61%

Adsorption of albumin on prosthetic materials: Implication for tribological behavior

Serro

Gispert²,

Martins³

et al. 2006

J Biomedical Materials Res

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The orthopedic prosthesis used to substitute damaged natural joints are lubricated by a pseudosynovial fluid that contains biological macromolecules with potential boundary lubrication properties. Proteins are some of those macromolecules whose role in the lubrication process is not yet completely understood. In a previous work, we investigated the influence of the presence of albumin, the major synovial protein, upon the tribological behavior of three of the most used pairs of artificial joint materials: ultra high molecular weight polyethylene (UHMWPE) against counterfaces of alumina, CoCrMo alloy, and 316L stainless steel. Albumin was found to cause a significant decrease in the friction coefficient when the counterfaces were metallic because transfer of UHMWPE was avoided, but this effect was much weaker in the case of alumina. The objective of the present work was to look for an explanation for these differences in tribological behavior in terms of albumin adsorption. With this goal, studies on adsorption of bovine serum albumin (BSA) on the counterface materials, from a biological model fluid (Hanks' balanced salt solution), were carried out using radiolabeled albumin ((125)I-BSA), X-ray photoelectron spectroscopy, and atomic force microscopy. The conclusion from all techniques is that the driving force for albumin adsorption is higher on the metals than on alumina. These results confirm that the greater the amount of protein adsorbed on the counterface, the more efficient is the protection against the transfer of polymeric film to the counterface.

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Section: Resultssupporting

confidence: 61%

Adsorption of albumin on prosthetic materials: Implication for tribological behavior

Serro

Gispert²,

Martins³

et al. 2006

J Biomedical Materials Res

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“…35,36 This observation confirmed that the ACOCl group of MWNT-COCl reacted with ethylene glycol to form MWNT-OH. The hydroxyl stretching band appeared as a strong, broad band at 3385 cm À1 in crude MWNTs but shifted to 3441 cm À1 and 3426 cm À1 in samples of MWNTÀCOOH and MWNTÀOH, respectively.…”

supporting

confidence: 58%

Synthesis and characterization of poly(trimethylene terephthalate) nanocomposites incorporating multi‐walled carbon nanotubes

2009

J of Applied Polymer Sci

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Poly(trimethylene terephthalate) (PTT) nanocomposites containing multi-walled carbon nanotubes (MWNTs) were prepared using a melt-blending process. Acrylic acid-grafted PTT (PTT-g-AA) and multihydroxylfunctionalized MWNTs (MWNTsÀOH) were used to improve the compatibility and dispersibility of MWNTs within the PTT matrix. The nanocomposites were characterized morphologically by transmission electron microscopy and chemically using Fourier transform infrared absorbance, 13 C solid-state nuclear magnetic resonance, and ultraviolet-visible spectroscopy. The thermal and mechanical properties of the blends were also evaluated. The functionalized PTT-g-AA/MWNT-OH blend showed markedly enhanced thermal and mechanical properties due to the formation of ester bonds from the condensation of the carboxylic acid groups of PTT-g-AA with the hydroxyl groups of MWNT-OH. The optimal proportion of MWNT-OH in the blends was 1 wt %. In excess of this amount, compatibility between the organic and inorganic phases was compromised.

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“…This implies that the higher stretching force in HS makes the polymer chains more ordered, resulting in breaking the semi-crystalline structure. Second, hydrogen bonding between the ester groups, which were formed in the polymer chains and in the carboxylic acid groups on the CNTs by pre-treatment with acid, could disrupt the crystallinity of the PVAc3940. Thus, these results emphasize the significance of understanding the interaction in the composite.…”

Section: Resultsmentioning

confidence: 91%

Handspinning Enabled Highly Concentrated Carbon Nanotubes with Controlled Orientation in Nanofibers

Lee

Watanabe

Kim

et al. 2016

Sci Rep

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The novel method, handspinning (HS), was invented by mimicking commonly observed methods in our daily lives. The use of HS allows us to fabricate carbon nanotube-reinforced nanofibers (CNT-reinforced nanofibers) by addressing three significant challenges: (i) the difficulty of forming nanofibers at high concentrations of CNTs, (ii) aggregation of the CNTs, and (iii) control of the orientation of the CNTs. The handspun nanofibers showed better physical properties than fibers fabricated by conventional methods, such as electrospinning. Handspun nanofibers retain a larger amount of CNTs than electrospun nanofibers, and the CNTs are easily aligned uniaxially. We attributed these improvements provided by the HS process to simple mechanical stretching force, which allows for orienting the nanofillers along with the force direction without agglomeration, leading to increased contact area between the CNTs and the polymer matrix, thereby providing enhanced interactions. HS is a simple and straightforward method as it does not require an electric field, and, hence, any kinds of polymers and solvents can be applicable. Furthermore, it is feasible to retain a large amount of various nanofillers in the fibers to enhance their physical and chemical properties. Therefore, HS provides an effective pathway to create new types of reinforced nanofibers with outstanding properties.

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Hydrogen-Bond-Driven Assembly of Thin Multiwalled Carbon Nanotubes

Cited by 20 publications

References 20 publications

Adsorption of albumin on prosthetic materials: Implication for tribological behavior

Adsorption of albumin on prosthetic materials: Implication for tribological behavior

Synthesis and characterization of poly(trimethylene terephthalate) nanocomposites incorporating multi‐walled carbon nanotubes

Handspinning Enabled Highly Concentrated Carbon Nanotubes with Controlled Orientation in Nanofibers

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