Radical functionalization of single-walled carbon nanotubes with azo(bisisobutyronitrile)

Wang, Xianbao; Li, Shaoqing; Xu, Youlong; Wan, Li; You, Haijun; Q, Li; Wang, Shimin

doi:10.1016/j.apsusc.2007.03.048

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…ρ MWCNT = 1.7 g/cm 3 is the average density of MWCNT used in the research. This result is consistent with previously published findings that increasing oxygen content on the surface of CNT [7] or shortening of tubes [15] leads to the network with a more uniform pore structure and denser morphology, i.e., the lower porosity. It indicates better nanotube dispersion in the aqueous suspension during filtration, when tubes are deposited as more individualized units or as smaller agglomerates.…”

Section: Free-standing Entangled Mwcnt Networksupporting

confidence: 95%

“…KMnO 4 produces mainly carboxylic acid groups (-COOH) with some amounts of other oxygenated functional groups, such as hydroxyl (-OH) or carbonyl (=O) groups, on the nanotube surface [13,14]. Functionalized nanotubes are better individualized from the bundles and aggregates since they are shorter and the functional groups tend to push away individual nanotubes from each other [15]. Commonly used high-energy ultrasound can also cause degradation of CNT when the aspect ratio of the tubes decreases and their ends open [16,17].…”

Section: Free-standing Entangled Mwcnt Networkmentioning

confidence: 97%

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Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Slobodian

Riha

Olejník

2011

Lecture Notes in Electrical Engineering

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Abstract.A network of entangled multiwall carbon nanotubes and the composite consisting of filter-supported multiwall carbon nanotube network are conductors whose conductivity is sensitive to compressive stress both in the course of monotonic stress growth and when loading/unloading cycles are imposed. The testing has shown as much as 100% network conductivity increase at the maximum applied stress. The entangled carbon nanotube networks are prepared by vacuum filtration method and peeled off from the filter. The carbon nanotubes are used in pristine condition or chemically functionalized. The filtersupported entangled networks are prepared by the nanotube dispersion filtration through a non-woven flexible polystyrene filter. The nanotubes infiltrate partly into the filter surface pores and link the accumulated filtrate layer with the filtering mat. The filter-support increases nanotube network mechanical integrity, the composite tensile ultimate strength and affects favorably the composite electrical resistance. Other obvious effect of the supporting polymer is reduction of the resistance temperature dependence. Moreover, the conductivity of carbon nanotube networks manifests also organic vapor dependence. The dependence is reversible, reproducible, selective as well as influenced by nanotube oxidation.

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Section: Free-standing Entangled Mwcnt Networksupporting

confidence: 95%

Section: Free-standing Entangled Mwcnt Networkmentioning

confidence: 97%

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Slobodian

Riha

Olejník

2011

Lecture Notes in Electrical Engineering

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“…In the case of MWCNT‐N/PMMA network composite prepared by solution polymerization of allyl isocyanate functionalized MWCNT‐N, the loss value represents the molecules covalently bonded to CNT surface by radical addition and/or incorporation of free allyl groups attached to CNT surface. Also some portion of isobutyronitrile groups originated from radical initiator AIBN should be expected to be covalently bonded to CNT surface again by process of radical addition 29. The detected value around 13 wt % is lower in comparison with 45 wt % of PS,31 or 47 wt % of PMMA32 for the same technique using isocyanate‐based binding elements followed by radical polymerization.…”

Section: Resultsmentioning

confidence: 97%

“…In the case of grafted composite, the CNT surface is functionalized by the radicals originated during polymerization process. The free radicals created either from the initiator or as a growing polymer macro‐radicals are able to react with CNT structure by opening the π‐bonds in carbon nanotubes and creating a covalent bond between CNT and the radicals (radical addition) 29, 30. In the case of MWCNT‐N/PMMA network composite prepared by solution polymerization of allyl isocyanate functionalized MWCNT‐N, the loss value represents the molecules covalently bonded to CNT surface by radical addition and/or incorporation of free allyl groups attached to CNT surface.…”

Section: Resultsmentioning

confidence: 99%

Increased sensitivity of multiwalled carbon nanotube network by PMMA functionalization to vapors with affine polarity

Olejník

Slobodian

Riha

et al. 2012

J of Applied Polymer Sci

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Multiwalled carbon nanotube network (MWCNT-N)/poly(methyl methacrylate) (PMMA) composite is prepared by solution radical polymerization. The entangled multiwall carbon nanotube network (MWCNT-N) is obtained by vacuum filtration and functionalized by allyl isocyanate to form polymerizable vinyl groups on a nanotube surface. The solution polymerization binds PMMA covalently to these groups and yields MWCNT-N/PMMA composite manifesting electrical conduction and selective chemical vapor sensing. The latter property is evaluated in terms of affinity of organic solvent vapor and PMMA polarities. It is found that the affinity of ace-tone polarity with polarity of PMMA improves significantly the sensitivity of the composite to this solvent while the sensitivity to methanol is the same and to iso-pentane even decreased in comparison with the corresponding property of MWCNT-N. The composite selective response is favorable for a possible composite use as a sensing element and/or vapor switch.

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“…Projection pursuit dynamic clustering method has been successfully applied in multi-factor comprehensive evaluation. For example, projection pursuit dynamic clustering method has been applied to analyze climate zoning in reference [12], and satisfactory results have been obtained. In reference [13], a projection pursuit dynamic clustering method was established to solve the problem of regional partition of water resources in China, and so on.…”

Section: Comprehensive Evaluation Model Of Lightning Disaster Vulneramentioning

confidence: 99%

Study on Vulnerability Evaluation Method of Lightning Disaster based on Projection Pursuit Dynamic Clustering Model

Zhang¹,

Huang²

2018

Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)

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Vulnerability evaluation of lightning disaster is an important part of lightning disaster research and it is a typical multi-factor comprehensive evaluation problem based on index system. Multi-factor evaluation methods such as hierarchical zoning method, cluster analysis, analytic hierarchy process, principal component analysis and fuzzy evaluation are all applied to the vulnerability evaluation of lightning disaster. However, these methods need to determine the weights of each index artificially in the process of comprehensive evaluation, which leads to the subjective differences of evaluation results. Therefore, a comprehensive evaluation model of lightning disaster vulnerability is established by using projection pursuit dynamic clustering method. The case studies show that the method does not need to be given the weight of each index in advance, but evaluates comprehensively according to the characteristics of the sample data. The results are objective and easy to operate, which provides a new method for the objective evaluation of lightning disasters vulnerability.

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Radical functionalization of single-walled carbon nanotubes with azo(bisisobutyronitrile)

Cited by 19 publications

References 16 publications

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Increased sensitivity of multiwalled carbon nanotube network by PMMA functionalization to vapors with affine polarity

Study on Vulnerability Evaluation Method of Lightning Disaster based on Projection Pursuit Dynamic Clustering Model

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