Surface Modification of Aligned Carbon Nanotube Arrays for Electron Emitting Applications

Patil, Ajeeta; Vaia, R. A.; Dai, Liming

doi:10.1016/j.synthmet.2005.07.058

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…As PHBV is poorly wettable, improving the wettability of the PHBV matrix has been attempted using plasma or γ radiation or ozone‐induced oxidation 9, 12, 31, 32. Such approaches have endowed the solid polymer surface with rich chemical functionality, while keeping the polymer surface flat on the micrometer scale 33. To make the chemically modified PHBV more bioactive, one approach is to coat biological molecules onto the polymer surface 9, 12.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the biological responses of osteoblast‐like UMR‐106 cells to the engineered porous PHBV matrix

Liu

Raghavan

Stubbs

2006

J Biomedical Materials Res

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Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) has been investigated for biomedical applications due to its many biologically favorable properties. However, to explore its application in bone tissue engineering, the poorly bioactive surface property of PHBV must be improved. To engineer PHBV to achieve a biologically active surface, in this study each porous PHBV matrix was prepared by solute leaching of salt/PHBV cast film and was treated with ozone followed by dip coating with type I collagen. The biological responses of osteoblast-like UMR-106 cells after being grown on the engineered PHBV matrix were evaluated. Confocal microscopy and the MTT assay were used to map and quantify the viable cell proliferation on the PHBV matrix, respectively. The cells were cultivated in osteogenic media containing beta-glycerophosphate and later stained with alizarin red to visualize mineralization of the matrix. RNA was extracted from the UMR-106 cells, and reverse transcriptase-polymerase chain reaction (RT-PCR) was applied to detect expression of glyceraldehyde 3-phosphate dehydrogenase (GAPDH) (a house keeping gene) and bone sialoprotein (BSP) (marker of the osteoblastic phenotype). The results showed that the UMR-106 cells after cultivation on the engineered PHBV matrix retained the osteoblastic phenotype characteristics, indicating that the porous PHBV matrix after ozone treatment and collagen dip coatings are a promising scaffold for bone tissue engineering applications.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the biological responses of osteoblast‐like UMR‐106 cells to the engineered porous PHBV matrix

Liu

Raghavan

Stubbs

2006

J Biomedical Materials Res

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“…The success in this field offers a wide range of technological opportunities in a myriad of applications. For instance, in order to enhance the field-emission properties of VA-CNTs, a two-step method can be applied [125]. It consists of sheathing the nanotubes with a thin layer of polymer coating by means of a radio-frequency hexane-plasma treatment, followed by a water-induced restructuring.…”

Section: Reviewmentioning

confidence: 99%

Functionalization of vertically aligned carbon nanotubes

Hooijdonk¹,

Bittencourt²,

Snyders³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryThis review focuses and summarizes recent studies on the functionalization of carbon nanotubes oriented perpendicularly to their substrate, so-called vertically aligned carbon nanotubes (VA-CNTs). The intrinsic properties of individual nanotubes make the VA-CNTs ideal candidates for integration in a wide range of devices, and many potential applications have been envisaged. These applications can benefit from the unidirectional alignment of the nanotubes, the large surface area, the high carbon purity, the outstanding electrical conductivity, and the uniformly long length. However, practical uses of VA-CNTs are limited by their surface characteristics, which must be often modified in order to meet the specificity of each particular application. The proposed approaches are based on the chemical modifications of the surface by functionalization (grafting of functional chemical groups, decoration with metal particles or wrapping of polymers) to bring new properties or to improve the interactions between the VA-CNTs and their environment while maintaining the alignment of CNTs.

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“…Polymer nanocomposite materials are often easy to process and provide property enhancements extending orders of magnitude beyond those realized with traditional polymer composites. Carbon nanotubes (CNTs), − layered silicate clay nanoparticles, − cellulose nanocrystals, graphite nanoflakes, − etc. are the examples of commonly used reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Effects of Plasticizers and Clays on the Physical, Chemical, Mechanical, Thermal, and Morphological Properties of Potato Starch-Based Nanocomposite Films

2020

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Biodegradable polymeric films have great potential as alternatives to synthetic polymeric films to reduce environmental pollution. Plasticizing agents and nanofillers can improve the mechanical properties of polymer-based composites, resulting in materials with better flexibility and extensibility. Starch, a natural polymer, can be produced at low cost and on a large scale from abundant and inexpensive agricultural resources like potatoes. The aim of the present work was to fabricate mechanically strong and thermally stable potato starch films reinforced with different types of plasticizers and nanoclays at different concentrations. Different types of plasticizers such as water, glycerin, ethylene glycol, sorbitol, and formamide and three types of clays such as montmorillonite, hectorite, and kaolinite at various concentrations were used to prepare potato starch-based nanocomposite films. The films were prepared using a very simple solution casting process. The mechanical properties and thermal stabilities of nanocomposite films significantly improved using montmorillonite, hectorite, and kaolinite clays. The water uptake percentage of the fabricated films decreased with addition of plasticizers and further decreased with addition of different types of clays. The structural and morphological changes of the fabricated films in the presence of plasticizers and nanoclays were correlated in detail with their mechanical properties, crystallinity, biodegradability, thermal stability, and water absorption capacities.

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Surface Modification of Aligned Carbon Nanotube Arrays for Electron Emitting Applications

Cited by 9 publications

References 9 publications

Evaluation of the biological responses of osteoblast‐like UMR‐106 cells to the engineered porous PHBV matrix

Evaluation of the biological responses of osteoblast‐like UMR‐106 cells to the engineered porous PHBV matrix

Functionalization of vertically aligned carbon nanotubes

Effects of Plasticizers and Clays on the Physical, Chemical, Mechanical, Thermal, and Morphological Properties of Potato Starch-Based Nanocomposite Films

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