Nanohelices from planar polymer self-assembled in carbon nanotubes

Fu, Hongjin; Xu, Shuqiong; Li, Yunfang

doi:10.1038/srep30310

Cited by 21 publications

(19 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, solvent polarity was shown to affect polymer adsorption on CNTs by altering polymer flexibility and the strength of nonbonded interactions [14]. MD simulations also provided important details on the interaction between CNTs and various polymeric systems, such as pyrene-attached polyethylene chains [14], branched PPOpolyethylene oxide segments [15], different polyether surfactants [16], polyamide-66 [17], lipid-PEG chains [18], and different flexible polymers [19,20].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of adsorption of long pyrene-PEG chains on athin carbon nanotube

AKKUŞ¹,

LEVİTAS²

2019

Turk J Chem

View full text Add to dashboard Cite

Carbon nanotubes have emerged as highly promising theranostic agents due to their unique structural/physical features, high surface area, and high drug-loading capacity. The high cytotoxicity of carbon nanotubes can be eliminated by noncovalent coating using hydrophilic polymers. We investigated the adsorption of long pyrene functionalized polyethylene glycol (PEG) chains, PEG 2000 and PEG 5000 , on a single-walled carbon nanotube (SWNT) from a crowded solution. Full-atom molecular dynamics simulations in explicit water were used to mimic the experimental conditions of noncovalent PEGylation with a stoichiometry of one SWNT to ten pyrene-PEG. Although the diffusional behavior of the pyrene molecules still attached to the polymers did not change according to chain length, the adsorption rate for pyrene-PEG 2000 to the SWNT was higher than that for pyrene-PEG 5000 chains. Here longer chains sterically hindered the adsorption of pyrene groups on the SWNT surface. Once adsorbed, pyrene molecules stayed on the SWNT surface even though they frequently adopted different orientations that may weaken their π − π stacking interactions with the nanotube surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of adsorption of long pyrene-PEG chains on athin carbon nanotube

AKKUŞ¹,

LEVİTAS²

2019

Turk J Chem

View full text Add to dashboard Cite

show abstract

“…Non-covalent functionalization processes are primarily in use when it comes to electrical, thermal, or catalytic applications of CNT. Another non-covalent method involves helical wrapping of the CNT with a polymer [ 9 ]. Applications in mechanically stressed structural parts usually benefit from the covalent modification approach.…”

Section: Introductionmentioning

confidence: 99%

Acid Free Oxidation and Simple Dispersion Method of MWCNT for High-Performance CFRP

et al. 2018

View full text Add to dashboard Cite

Carbon nanotubes (CNT) provide an outstanding property spectrum which can be used to improve a wide range of materials. However, the transfer of properties from the nanoscale to a macroscopic material is a limiting factor. Different approaches of functionalizing the surface of a CNT can improve the interaction with the surrounding matrix but is connected to difficult and expensive treatments, which are usually inconvenient for industrial applications. Here, a simple and eco-friendly method is presented for the oxidation of CNT, where hydrogen peroxide (H2O2) is the only chemical needed and no toxic emissions are released. Also, the extensive step of the incorporation of CNT to an epoxy matrix is simplified to an ultrasonic dispersion in the liquid hardener component. The effectiveness is proven by mechanical tests of produced CNT/CFRP and compared to a conventional processing route. The combination of those simple and cost efficient strategies can be utilized to produce multiscale composites with improved mechanical performance in an ecological and economical way.

show abstract

“…Local aggregations of lamellae and traces of helicoidal structures on the nanotube walls are also observed in the same TEM images. 39,40 Most of the co-axial lamellae structures wrap around the SWNTs either perpendicularly or with a specific tilting angle (see Figure 3i), in a way to form a closed ring structure when the absorption stresses, provided by the SWNTs, overcome the bending strain energy of the polymer chains. The closed-ring perpendicular arrangement, that resembles a HSK structure, is clearly visible in the AFM images (Figure 3a) that show a closer look of the resulting nanopiston morphology.…”

Section: Resultsmentioning

confidence: 99%

“Sliding Crystals” on Low-Dimensional Carbonaceous Nanofillers as Distributed Nanopistons for Highly Damping Materials

Talò

Lanzara

Krause

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Improving energy dissipation in lightweight polymer nanocomposites to achieve environmentally friendly and mechanically stable structures has reached a limit because of the low-density electrostatic interactions that can be harnessed through the stick–slip mechanism between carbonaceous nanofillers and polymeric chains wrapped around them. In this paper, the atomic friction between the two nanocomposite components is greatly amplified by locally increasing the density of the energetically higher noncovalent bonds. This gives rise to a new material design concept in which crystallite structures, nucleated around the carbonaceous nanofillers, become the source of enhanced energy dissipation. The rheological concept is a nanopiston unit consisting of a carbon nanotube (CNT) as a nanofiller coated with crystallite structures which, upon unconventionally and reversibly overcoming the interfacial interaction forces, monolithically roto-translate from an energetically stable state to the adjacent states. The efficiency of this novel “sliding crystals” mechanism is proven by its higher dissipation capability that turns out to be at least twice as much as that of the conventional CNT/polymer stick–slip within a larger strain range.

show abstract

Nanohelices from planar polymer self-assembled in carbon nanotubes

Cited by 21 publications

References 47 publications

Molecular dynamics simulations of adsorption of long pyrene-PEG chains on athin carbon nanotube

Molecular dynamics simulations of adsorption of long pyrene-PEG chains on athin carbon nanotube

Acid Free Oxidation and Simple Dispersion Method of MWCNT for High-Performance CFRP

“Sliding Crystals” on Low-Dimensional Carbonaceous Nanofillers as Distributed Nanopistons for Highly Damping Materials

Contact Info

Product

Resources

About