Micrometer-size double-helical structures from phospholipid-modified carbon nanotubes

Ghellab, Salah Eddine; Han, Xiaojun

doi:10.1039/d2sm00198e

Cited by 2 publications

(1 citation statement)

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“…Transmission electron microscopy experiments have shown that single-tailed phospholipids form supramolecular complexes on the surface of CNTs [ 10 , 15 ]. Recently, self-assembly of phospholipids on CNTs has been shown to result in the formation of double-helical phospholipid-modified nanotube structures [ 16 , 17 ]. Such experimental findings are remarkable in view of the types of structures formed on the surface of CNTs and the potential applications of lipid–CNT hybrids.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Self-Assembly of Dipalmitoylphosphatidylcholine and Carbon Nanotubes: A Dissipative Particle Dynamics Simulation Study

2022

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Dissipative particle dynamics simulations were performed to investigate the self-assembly of dipalmitoylphosphatidylcholine (DPPC) as a model lipid membrane on the surface of carbon nanotubes (CNTs). The influence of surface curvature of CNTs on self-assembly was investigated by performing simulations on solutions of DPPC in water in contact with CNTs of different diameters: CNT (10, 10), CNT (14, 14), CNT (20, 20), and CNT (34, 34). DPPC solutions with a wide range of concentrations were chosen to allow for formation of lipid structures of various surface densities, ranging from a submonolayer to a well-organized monolayer and a CNT covered with a lipid monolayer immersed in a planar lipid bilayer. Our results are indicative of a sequence of phase-ordering processes for DPPC on the surface of CNTs. At low surface coverages, the majority of hydrocarbon tail groups of DPPC are in contact with the CNT surface. Increasing the surface coverage leads to the formation of hemimicellar aggregates, and at high surface coverages close to the saturation limit, an organized lipid monolayer self-assembles. An examination of the mechanism of self-assembly reveals a two-step mechanism. The first step involves densification of DPPC on the CNT surface. Here, the lipid molecules do not adopt the order of the target phase (lipid monolayer on the CNT surface). In the second step, when the lipid density on the CNT surface is above a threshold value (close to saturation), the lipid molecules reorient themselves to form an organized monolayer around the tube. Here, the DPPC molecules adopt stretched conformations normal to the surface, the end hydrocarbon groups adsorb on the surface, and the head groups occupy the outermost part of the monolayer. The saturation density and the degree of lipid ordering on the CNT surface depend on the surface curvature. The saturation density increases with increased surface curvature, and better-ordered structures are formed on less curved surfaces.

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Section: Introductionmentioning

confidence: 99%

Supramolecular Self-Assembly of Dipalmitoylphosphatidylcholine and Carbon Nanotubes: A Dissipative Particle Dynamics Simulation Study

2022

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Controllable Preparation of Helical Carbon Nanofibers for Electromagnetic Wave Absorption

Guo,

Li,

Xia

et al. 2024

ACS Appl. Nano Mater.

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Helical carbon nanofibers (HCNFs) with enhanced wave-absorbing properties are successfully prepared by a combustion method catalyzed by Sn-MOF and with an appropriate amount of water as the combustion additive. A series of characterization methods, such as X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy, consistently show that microstructures suitable for microwave absorption and scattering are formed in the prepared HCNFs with a relatively uniform size. The microwave absorption properties of these HCNFs are investigated in detail in this study. The HCNF-0.25, HCNF-0.5, and HCNF-0.75 samples showed much better microwave absorbing capacity compared with the HCNF-0 sample under the filling ratio of 20 wt %. The HCNF-0.75 sample exhibited a minimum reflection of −54.445 dB at 2.4 mm. Overall, this work provides valuable insights for more in-depth exporting of dielectric loss to enhance the microwave absorption properties of the nanomaterials.

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Micrometer-size double-helical structures from phospholipid-modified carbon nanotubes

Abstract: Biomolecular self-assembly plays a key role in the life system. Herein the double-helical phospholipid modified carbon nanotubes structures, first order, and secondary helical hybrids were constructed using self-assembly of phospholipids...

Cited by 2 publications

References 50 publications

Supramolecular Self-Assembly of Dipalmitoylphosphatidylcholine and Carbon Nanotubes: A Dissipative Particle Dynamics Simulation Study

Supramolecular Self-Assembly of Dipalmitoylphosphatidylcholine and Carbon Nanotubes: A Dissipative Particle Dynamics Simulation Study

Controllable Preparation of Helical Carbon Nanofibers for Electromagnetic Wave Absorption

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