Multilayer Graphene Sheet with Conical Nanopores as a Membrane for High-Permeance Molecular Separation

Abstract We consider how the bending stiffness of a multilayer graphene sheet relies on its bending geometry, including the in-plane length L and the curvature κ. We use an interlayer shear model to characterize the periodic interlayer tractions due to the lattice structure. The bending stiffness for the sheet bent along a cylindrical surface is extracted via an energetic consideration. Our discussion mainly focuses on trilayer sheets, particularly the complex geometry-dependency of their interlayer stress transfer behavior and the overall bending stiffness. We find that L and κ dominate the bending stiffness, respectively, in different stable regions. These results show good quantitative agreement with recent experiments where the stiffness was found to be a non-monotonic function of the bending angle (i.e., Lκ). Besides, for a given in-plane length, the trilayer graphene in the flat state (κ → 0) is found to have the maximum bending stiffness. According to our analytical solution to the flat state, the bending stiffness of trilayer graphene sheet can vary by two orders of magnitude. Furthermore, once multilayer graphene sheets are bent along a cylindrical surface with small curvature, the sheets perform similar characteristics. Though the discussion mainly focuses on the trilayer graphene, the theoretical framework presented here can be readily extended for various van der Waals materials beyond graphene of arbitrary layer numbers.

Download Full-text

Flexural electromechanical properties of multilayer graphene sheet/carbon nanotube/vinyl ester hybrid nanocomposites

Composites Science and Technology ◽

10.1016/j.compscitech.2020.108164 ◽

2020 ◽

Vol 194 ◽

pp. 108164 ◽

Cited By ~ 1

Author(s):

C.A. Sierra-Chi ◽

H. Aguilar-Bolados ◽

M.A. López-Manchado ◽

R. Verdejo ◽

J.V. Cauich-Rodríguez ◽

...

Keyword(s):

Carbon Nanotube ◽

Graphene Sheet ◽

Vinyl Ester ◽

Hybrid Nanocomposites ◽

Multilayer Graphene ◽

Electromechanical Properties

Download Full-text

Elastic properties of graphene-reinforced aluminum nanocomposite: Effects of temperature, stacked, and perforated graphene

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420720930739 ◽

2020 ◽

Vol 234 (9) ◽

pp. 1218-1227

Author(s):

Ashish Kumar Srivastava ◽

Vimal Kumar Pathak

Keyword(s):

Graphene Sheet ◽

Graphene Sheets ◽

Marginal Effect ◽

Multilayer Graphene ◽

Plane Shear ◽

Shear Moduli ◽

Temperature Changes ◽

Stiffness Properties ◽

Out Of Plane ◽

Dynamics Simulations

In this article, the elastic and shear moduli of the graphene sheet-reinforced aluminum nanocomposite have been investigated by molecular dynamics simulations. Different models have been simulated to study the effect of multilayer graphene sheet, perforation of GS, and temperature on the elastic and shear moduli of resulting nanocomposite. The simulation results show that the elastic and shear moduli of graphene sheet-reinforced aluminum are sensitive to the temperature changes, multilayer, and perforated graphene sheets. The temperature and perforation of graphene sheets exert adverse effects on the elastic and shear moduli of graphene sheet-reinforced aluminum nanocomposites. However, the multilayer graphene sheet leads to favorable effects on the stiffness properties of the nanocomposite. It is also observed that there is only a marginal effect of the chirality of graphene sheet on the out-of-plane shear moduli of the nanocomposite.

Download Full-text

Iono-molecular Separation with Composite Membranes II. Preparation and characterization of polysulphone and composite nanoparticles

Revista de Chimie ◽

10.37358/rc.17.2.5420 ◽

2017 ◽

Vol 68 (2) ◽

pp. 203-209

Author(s):

Hussam Nadum Abdalraheem Al Ani ◽

Anca Maria Cimbru ◽

Corneliu Trisca-Rusu ◽

Szidonia Katalin Tanczos ◽

Adriana Cuciureanu ◽

...

Keyword(s):

Chemical Species ◽

Composite Membranes ◽

Ammonium Persulfate ◽

Operating Pressure ◽

Polysulfone Membrane ◽

Polymeric Nanoparticle ◽

Molecular Separation ◽

Copper Complexation ◽

Molecular Separations ◽

Methyl Pyrrolidone

This paper illustrates the possibility of producing iono-molecular separations using ionic colloidal ultrafiltration membrane of polysulfone synthetic solutions of cupric ions and nitro phenols through ultrafiltration assisted by polymeric nanoparticle composites based on polysulfone. In the present work, in order to reduce the operating pressure and increase the flow of water we are using the process of ultrafiltration through a polysulfone membrane in N-methylpyrrolidone 10% prepared by coagulation in isopropanol. The nanoparticles needed in colloidal ultrafiltration had been obtained through the immersion technique of precipitation of a solution of 5% PSf in N-methyl pyrrolidone containing 3% aniline in lower alcohols: methanol, ethanol, and isopropanol, followed by the oxidation of the remaining aniline in a solution of 10% hydrochloric acid and ammonium persulfate. The Nanoparticles of polysulfone (NP-PSf) and The three obtained variants of nanoparticles composites (NP-PSf-PANI) were morphologically (SEM) and (AFM), structurally and compositionally (FTIR) characterized and the results show that nanoparticles polysulfone have a much lower range than the composites. The Possibility of copper complexation by both nitrophenols, and by nanoparticle surface probably lead to the formation of more stable aggregates in the supply, which can sufficiently justify the increased retention. The Retentions of the chemical species in question use in all the tests made the same series:R NP-PSf-PANI-M] R NP-PSf-PANI-E] R NP-PSf-PANI-P] R NP-PSf

Download Full-text

Iono-molecular Separation with Composite Membranes VI. Nitro-phenol separation through sulfonated polyether ether ketone on capillary polypropylene membranes

Revista de Chimie ◽

10.37358/rc.18.7.6379 ◽

2018 ◽

Vol 69 (7) ◽

pp. 1603-1607

Author(s):

Ion Spiridon Din ◽

Anca Maria Cimbru ◽

Abbas Abdul Kadhim Klaif Rikabi ◽

Szidonia Katalin Tanczos ◽

Simona Ticu (Cotorcea) ◽

...

Keyword(s):

Flow Rate ◽

Water Solubility ◽

Composite Membranes ◽

Membrane System ◽

Polyether Ether Ketone ◽

Molecular Separation ◽

Capillary Membrane ◽

Sulfonated Polyether Ether Ketone ◽

Source Phase ◽

Receptor Phase

The importance of removing and / or separating nitro phenols from aqueous solutions through membranes is substantiated by the multitude of recent research in the field, which broadly justifies both the economic and ecological reasons of such an approach. The present paper outlines the results of the transfer of nitro phenols through a membrane system made up of PPET impregnated polypropylene capillaries (PP) impregnated with sulfonate polyetheretherketone (SPEEK). The experiments were carried out in a PP-SPEEK capillary membrane module, with a useful size of 1 m2. Determinations made by using a 4 L / min flow rate source at a 5 mg / l nitrophenol concentration and pH 5 or pH 7, and the pH 12 receiving phase and a flow rate of 0.3 L / min, revealed that o- and p-nitrophenol were transferred much faster than m-nitrophenol (the flux is nearly double); the source phase of the system is concentrated in m-nitrophenol, and the receptor phase in o- and p-nitro phenols; the transfer data correlates with the higher water solubility of m-nitrophenol; mono nitro phenols transfer much faster than di nitrophenol, but both the mono and di nitrophenol streams decrease over time; after 4-5 hours of work, the mono nitrophenol concentration triples in the receiving phase, while the 2,4-dinitrophenol concentration doubles in the source phase.

Download Full-text