scholarly journals Transport of Surface-modified Carbon Nanotubes through a Soil Column

10.3791/52634 ◽  
2015 ◽  
Author(s):  
Prabhakar Sharma ◽  
Fritjof Fagerlund
Keyword(s):  
Carbon Nanotubes ◽  
Soil Column ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

CARBON NANOTUBES AND NANO-Ce–Zr OXIDES SUPPORTED H3PW12O40 FOR EFFECTIVE ADSORPTION–DECOMPOSITION OF NOx

2012 ◽  
Vol 11 (06) ◽  
pp. 1240030
Author(s):  
LIN CHENG ◽  
RUI WANG
Keyword(s):  
Carbon Nanotubes ◽  
Ethyl Alcohol ◽  
Mixed Oxides ◽  
Impregnation Method ◽  
Adsorption Efficiency ◽  
Grinding Method ◽  
Water As Solvent ◽  
Surface Modified ◽  
Modified Carbon Nanotubes ◽  
Peak Value

Surface-modified carbon nanotubes (CNTs) and nano- Ce–Zr mixed oxides (CZO) were prepared and employed initially as supports of H3PW12O40 (HPW) for NO x adsorption–decomposition. Both CNTs and nano-CZO are favorable supports for HPW. After loading with HPW, the NO x adsorption efficiency increases, especially for HPW/CZO in which the highest adsorption efficiency can achieve 98% at the HPW loading of 70%, much higher than that of single HPW. NO x adsorption efficiency can be influenced considerably by catalyst preparing conditions, in particularly, ethyl alcohol is superior to water as solvent for HPW loading onto CNTs; the –OH containing CNTs shows better promotion effect on the adsorption of NO x than that containing –COOH when using absolute ethyl alcohol as solvent; mechanical grinding method is superior to incipient impregnation method in loading HPW onto the support of CZO. For both catalysts of HPW/CNTs and HPW/CZO, with the increase of HPW loading, the NO x adsorption efficiency tends to reach a peak value before dropping down. Heated from 150°C to 450°C at a rate of 50°C/min, the adsorbed NO was found to decompose into N2 , O2 and N2O , and yields of N2 being 21.8% and 27.3%, respectively for HPW/CNTs and HPW/CZO were obtained.

Shape-Memory Nanocomposite Elastomers Filled with Carbon Nanomaterials

2016 ◽  
Vol 100 ◽  
pp. 5-10
Author(s):  
Giuseppe Cesare Lama ◽  
Gennaro Gentile ◽  
Pierfrancesco Cerruti ◽  
Marino Lavorgna ◽  
Veronica Ambrogi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Carbon Nanomaterials ◽  
Thermomechanical Analysis ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Dispersion Test ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

In this contribution, the preparation and characterization of new shape-memory epoxy based nanocomposites filled with modified multiwalled carbon nanotubes are reported. The study has been focused on the optimization of the preparation methodology and on the evaluation of the effect of different contents of surface modified carbon nanotubes on the properties and the microstructure of the obtained materials. In particular, dispersion test, infrared spectroscopy, thermogravimetric analysis and bright field transmission electron microscopy have been carried out to analyze the modified filler. Moreover, the obtained nanocomposites have been characterized by morphological analysis, differential scanning calorimetry, thermomechanical analysis and X-ray analysis in order to clarify the effect of the nanofiller on the structure and shape memory properties of the materials.

Interaction between Palladium Nanoparticles and Surface-Modified Carbon Nanotubes: Role of Surface Functionalities

ChemCatChem ◽  
2014 ◽  
Vol 6 (9) ◽  
pp. 2607-2612 ◽  
Author(s):  
Bingsen Zhang ◽  
Lidong Shao ◽  
Wei Zhang ◽  
Xiaoyan Sun ◽  
Xiaoli Pan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Palladium Nanoparticles ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

scholarly journals Superior operational stability of immobilized l-asparaginase over surface-modified carbon nanotubes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mafalda R. Almeida ◽  
Raquel O. Cristóvão ◽  
Maria A. Barros ◽  
João C. F. Nunes ◽  
Rui A. R. Boaventura ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Operating Conditions ◽  
Operational Stability ◽  
Free Form ◽  
Consecutive Reaction ◽  
Multi Walled Carbon Nanotubes ◽  
Activity Loss ◽  
Surface Modified ◽  
Modified Carbon Nanotubes ◽  
Functionalized Mwcnts

Abstractl-asparaginase (ASNase, EC 3.5.1.1) is an enzyme that catalyzes the l-asparagine hydrolysis into l-aspartic acid and ammonia, being mainly applied in pharmaceutical and food industries. However, some disadvantages are associated with its free form, such as the ASNase short half-life, which may be overcome by enzyme immobilization. In this work, the immobilization of ASNase by adsorption over pristine and modified multi-walled carbon nanotubes (MWCNTs) was investigated, the latter corresponding to functionalized MWCNTs through a hydrothermal oxidation treatment. Different operating conditions, including pH, contact time and ASNase/MWCNT mass ratio, as well as the operational stability of the immobilized ASNase, were evaluated. For comparison purposes, data regarding the ASNase immobilization with pristine MWCNT was detailed. The characterization of the ASNase-MWCNT bioconjugate was addressed using different techniques, namely Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA) and Raman spectroscopy. Functionalized MWCNTs showed promising results, with an immobilization yield and a relative recovered activity of commercial ASNase above 95% under the optimized adsorption conditions (pH 8, 60 min of contact and 1.5 × 10–3 g mL−1 of ASNase). The ASNase-MWCNT bioconjugate also showed improved enzyme operational stability (6 consecutive reaction cycles without activity loss), paving the way for its use in industrial processes.

High-performance PDMS‐based triboelectric nanogenerator fabricated using surface-modified carbon nanotubes via pulsed laser ablation

2021 ◽  
Author(s):  
Kangpyo Lee ◽  
Sungwook Mhin ◽  
HyukSu Han ◽  
Ohyung Kwon ◽  
Woo-Byoung Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
High Performance ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Triboelectric Nanogenerator ◽  
Negative Friction ◽  
Surface Modified ◽  
Modified Carbon Nanotubes ◽  
High Electronegativity

Poly-(dimethylsiloxane) (PDMS) has been used as a negative friction layer in triboelectric nanogenerator (TENG) owing to its high electronegativity and flexibility. With advantage of the PDMS, various materials design to...

Rheological behavior of polypropylene nanocomposites at low concentration of surface modified carbon nanotubes

2012 ◽  
Vol 52 (9) ◽  
pp. 1868-1873 ◽  
Author(s):  
Selvin P. Thomas ◽  
Salihu Adamu Girei ◽  
Muataz Ali Atieh ◽  
S.K. De ◽  
Abdulhadi Al-Juhani
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Behavior ◽  
Low Concentration ◽  
Polypropylene Nanocomposites ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

Osteoblast cell response to surface-modified carbon nanotubes

2012 ◽  
Vol 32 (5) ◽  
pp. 1057-1061 ◽  
Author(s):  
Faming Zhang ◽  
Arne Weidmann ◽  
J. Barbara Nebe ◽  
Eberhard Burkel
Keyword(s):  
Carbon Nanotubes ◽  
Cell Response ◽  
Osteoblast Cell ◽  
Surface Modified ◽  
Modified Carbon Nanotubes
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