Superfast Preparation of SWNT Sponge by Flame Burning Method and Its Adsorptive, Elastic and Electrochemical Properties

NANO ◽  
2018 ◽  
Vol 13 (07) ◽  
pp. 1850077 ◽  
Author(s):  
Liang Lu ◽  
Hao Tong ◽  
Fengqiao Jin ◽  
Shihong Yue ◽  
Qing Meng ◽  
...  
Keyword(s):  
Large Scale ◽  
Organic Liquid ◽  
Compressive Strain ◽  
High Specific Capacitance ◽  
Flame Resistance ◽  
Electromechanical Properties ◽  
Single Walled Carbon Nanotube ◽  
Liquid Adsorption ◽  
Burning Method ◽  
Solvent Adsorption

A compressible single-walled carbon nanotube (SWNT) sponge was developed by a superfast flame burning method in less than 20[Formula: see text]s by moving polyurethane (PU) sponge template coated with SWNTs through an ethanol flame. By adjusting the geometries of the templates, the arbitrary shapes of the SWNT sponges composed of a unique network structure could be prepared as required. The SWNT sponges possessing good hydrophobicity and outstanding organic solvent adsorption capacity could adsorb various organic solvents and oils with high adsorption rate and good adsorption–volatilization and adsorption–combustion recycling performance. The SWNT sponges present good elasticity and compression stability even after a compressive strain of 80% and the 1000th loading/unloading cycle due to the stable skeleton structures. The SWNT sponges as flexible electrodes could also achieve high-specific capacitance of 126.8[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text] and 95% capacitance retention after 10 000 charge/discharge cycles. Owing to the availability of the flame, easy decomposition of the PU sponge and flame resistance of SWNTs, this facile flame burning method was demonstrated to be a practical approach to prepare the SWNT sponges on a large scale with controllable shape and density, moderate organic liquid adsorption capability, good elasticity and decent electromechanical properties.

Electronically Pure Single-Chirality Semiconducting Single-Walled Carbon Nanotube for Large-Scale Electronic Devices

2016 ◽  
Vol 8 (32) ◽  
pp. 20527-20533 ◽  
Author(s):  
Huaping Li ◽  
Hongyu Liu ◽  
Yifan Tang ◽  
Wenmin Guo ◽  
Lili Zhou ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Large Scale ◽  
Electronic Devices ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

Advanced Constitutive Model for the Accurate Evaluation of the Structural Performance of Welded Pipes in Offshore Applications

2018 ◽  
Author(s):  
Steven Cooreman ◽  
Dennis Van Hoecke ◽  
Martin Liebeherr ◽  
Philippe Thibaux ◽  
Hervé Luccioni
Keyword(s):  
Mechanical Properties ◽  
Constitutive Model ◽  
Large Scale ◽  
Structural Integrity ◽  
Compressive Strain ◽  
Longitudinal Direction ◽  
Structural Performance ◽  
Isotropic Hardening ◽  
Hardening Models ◽  
Strain Paths

To guarantee the structural integrity of oil and gas transporting pipelines, a detailed analysis of the pipe’s structural response has to be performed. This is of particular importance for offshore applications. As large scale testing is costly and time consuming, one often relies on FE (Finite Element) modelling to accomplish, at least, part of this task. Properties that typically need to be evaluated are compressive strain capacity, collapse resistance and ovalization during reel-lay installation. Furthermore, it can be assumed that those properties are influenced by the pipe forming process, as pipe forming will change the mechanical properties and the level of anisotropy and will modify/introduce residual stresses. Therefore, a first logical step is to simulate pipe forming before evaluating the pipe’s structural performance, to account for these effects. The reliability of FE simulations largely depends on the capability of the constitutive model to accurately describe the mechanical behaviour of the material being studied. Most commercial FE codes only offer combined kinematic-isotropic hardening models. Those models cannot capture the so-called cross-hardening effect and can therefore not predict the evolution of anisotropy during pipe forming. The present paper discusses the implementation and calibration of a more advanced constitutive model, more specifically the Levkovitch-Svendsen model, which accounts for isotropic, kinematic and distortional hardening. The model was implemented in Abaqus/Implicit through a UMAT user subroutine. An inverse modelling approach was applied to calibrate the constitutive model, whereby an extensive set of mechanical tests, involving cyclic tension-compression tests and tests with changing strain paths, was conducted. To assess the model’s performance, it was used in two case studies. The first study focused on the evolution of mechanical properties during spiral pipe forming. The results show that the Levkovitch-Svendsen model allows prediction of the properties in both the transverse and longitudinal direction on pipe. When applying a kinematic-isotropic hardening law only, the properties in the longitudinal direction are significantly underestimated. In the second study, different hardening models were used to predict the evolution of ovality during reel-lay installation. It was observed that the predictions made with the Levkovitch-Svendsen model were much closer to the experimental values than the results obtained by means of a kinematic-isotropic hardening model.

scholarly journals Simulating Molecular Interactions of Carbon Nanoparticles with a Double-Stranded DNA Fragment

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Zhuang Wang ◽  
Hao Fang ◽  
Se Wang ◽  
Fan Zhang ◽  
Degao Wang
Keyword(s):  
Carbon Nanotube ◽  
Quantum Dot ◽  
Molecular Interactions ◽  
Carbon Nanoparticles ◽  
Large Scale ◽  
Electrostatic Force ◽  
Md Simulations ◽  
Single Walled Carbon Nanotube ◽  
Double Stranded Dna ◽  
Dna Fragment

Molecular interactions between carbon nanoparticles (CNPs) and a double-stranded deoxyribonucleic acid (dsDNA) fragment were investigated using molecular dynamics (MD) simulations. Six types of CNPs including fullerenes (C60and C70), (8,0) single-walled carbon nanotube (SWNT), (8,0) double-walled carbon nanotube (DWNT), graphene quantum dot (GQD), and graphene oxide quantum dot (GOQD) were studied. Analysis of the best geometry indicates that the dsDNA fragment can bind to CNPs through pi-stacking and T-shape. Moreover, C60, DWNT, and GOQD bind to the dsDNA molecules at the minor groove of the nucleotide, and C70, SWNT, and GQD bind to the dsDNA molecules at the hydrophobic ends. Estimated interaction energy implies that van der Waals force may mainly contribute to the mechanisms for the dsDNA-C60, dsDNA-C70, and dsDNA-SWNT interactions and electrostatic force may contribute considerably to the dsDNA-DWNT, dsDNA-GQD, and dsDNA-GOQD interactions. On the basis of the results from large-scale MD simulations, it was found that the presence of the dsDNA enhances the dispersion of C60, C70, and SWNT in water and has a slight impact on DWNT, GQD, and GOQD.

Engineering Study of an Oil Gellation Technique to Control Spills from Distressed Tankers

1973 ◽  
Vol 1973 (1) ◽  
pp. 247-253
Author(s):  
Arnold M. Goldstein ◽  
Robert M. Koros ◽  
Barry L. Tarmy
Keyword(s):  
Crude Oil ◽  
Engineering Design ◽  
Environmental Protection Agency ◽  
Large Scale ◽  
Organic Liquid ◽  
Mixing Time ◽  
Gel Strength ◽  
Scale Model ◽  
Experimental Unit ◽  
Design Data

ABSTRACT Crude oil gellation is a potentially attractive technique for minimizing or preventing the loss of oil from a distressed tanker by converting the liquid oil into a rigid solid. The procedure involves the chemical reaction of two organic liquid gelling agents dissolved in the oil to form a gelant compound which entraps the oil. The resulting gel would float as a coherent mass if it were extruded from a ship or escape as a result of tanker break-up. This paper presents the results of a program undertaken to demonstrate in situ gellation on a large scale, and to gather engineering design information for this technique. The work was jointly funded in part by the U.S. Environmental Protection Agency. Engineering design data gathered during this study include the effect of mixing energy, mixing time, gellation time and temperature on gel strength. In addition, rheological properties of the gel were examined to relate gel strength to the maximum fluid static head that may be maintained without flow through a certain hull hole. Details of a gellation test with 500 bbl of South Louisiana crude oil will be discussed. The experimental unit was 7′ × 14′ × 30′ high and represented the region between two transverse frames in a wing compartment of a 21,000 dwt tanker. The design criteria for the mixing equipment required for gellation was validated by tracer mixing studies in both the 500 bbl tank and a one-seventh scale model of the larger unit. This work forms the basis for the further efforts on equipment development, selection and evaluation required before this technique can be used in the field.

Ultralow Feeding Gas Flow Guiding Growth of Large-Scale Horizontally Aligned Single-Walled Carbon Nanotube Arrays

Nano Letters ◽  
2007 ◽  
Vol 7 (7) ◽  
pp. 2073-2079 ◽  
Author(s):  
Zhong Jin ◽  
Haibin Chu ◽  
Jinyong Wang ◽  
Jinxing Hong ◽  
Wenchang Tan ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Large Scale ◽  
Gas Flow ◽  
Nanotube Arrays ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Carbon Nanotube Arrays

Large scale highly organized single-walled carbon nanotube networks for electrical devices

2009 ◽  
Vol 96 (2) ◽  
pp. 373-377 ◽  
Author(s):  
Laila Jaber-Ansari ◽  
Myung Gwan Hahm ◽  
Tae Hoon Kim ◽  
Sivasubramanian Somu ◽  
Ahmed Busnaina ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Large Scale ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Electrical Devices ◽  
Carbon Nanotube Networks

scholarly journals Compressive Behavior of Carbon Nanotube Reinforced Polypropylene Composites Under High Strain Rate: Insights From Molecular Dynamics

2021 ◽  
Author(s):  
Brijesh Mishra ◽  
Sumit Sharma
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Strain Rate ◽  
Compressive Strain ◽  
Md Simulations ◽  
Vital Role ◽  
Key Factors ◽  
Single Walled Carbon Nanotube ◽  
Vacancy Defects ◽  
Polypropylene Composites

Abstract Since the discovery of carbon nanotubes (CNTs), these have received a lot of attention because of their unusual mechanical electrical properties. Strain rate is one of the key factors that play a vital role in enhancing the mechanical properties of nanocomposites. In this study, (4, 4) armchair single-walled carbon nanotube (SWCNT) was employed with the polymer matrix as polypropylene (PP). The influence of compressive strain rate on SWCNT/PP nanocomposites was evaluated using MD simulations, and mechanical properties have been predicted. Stone-Wales (SW) and vacancy defects, were integrated on the SWCNT. The maximum Young’s modulus (E) of 81.501 GPa was found for the pristine SWCNT/PP composite for a strain rate of 1010 s-1. The least value of E was 45.073GPa for 6% SW defective/PP composite for a strain rate of 108 s-1. While the 6% vacancy defective CNT/PP composite showed the lowest value of E as 39.57GPa for strain rate 108 s-1. It was found that the mechanical properties of SWCNT/PP nanocomposites decrease with the increase in percent defect. It was also seen that the mechanical properties were enhanced with the increment in the applied strain rate. The results obtained from this study could be useful for the researchers designing PP-based materials for compression loading to be used for biomedical applications.

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