Tuning the surface wettability of carbon nanotube carpets in multiscale hierarchical solids

Karumuri, Anil Kumar; He, Lymeng; Mukhopadhyay, Sharmila M.

doi:10.1016/j.apsusc.2014.10.154

Cited by 19 publications

(27 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is an important observation, because the CA is an indication of surface morphology combined with chemical functional groups. Surface-functional bonds and related CA changes caused by oxygen plasma were reported earlier to be temporary and could be reversed by 110°C heat treatments [25]. This study indicates that even the process of AgNP deposition, which involves exposure to a precursor solution combined with very gentle heat treatment (60°C), can reverse the wettability of plasma-oxygen treated CNT carpet to a significant extent, if not fully.…”

Section: Influence Of Cnt Functionalization On Agnp Distributionsupporting

confidence: 57%

“…The second involves a sol-gel silica coating, created by dipping and drying the CNT-carpets in a silica precursor solution, followed by controlled heating. The details of both treatments have been reported in an earlier publication [25]. O 7 , MP bio; 99%).…”

Section: Methodsmentioning

confidence: 99%

“…In fact, the contact angles (CAs) could be cycled between 165±2°to less than 10°degrees by repeated cycles of plasma treatment and air annealing. On the other hand, permanent surface hydrophilic behavior could be imparted to these CNT carpets by coating them with an inorganic silica layer using a modified sol-gel method [25]. The latter method resulted in a permanent decrease in the CA from 160 to 35°.…”

Section: Q1mentioning

confidence: 99%

See 2 more Smart Citations

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

View full text Add to dashboard Cite

The effectiveness of nanoparticle-based functional devices depends strongly on the surface morphology and area of the support. An emerging powerful approach of increasing the available surface area without decreasing strength or increasing bulk is to attach arrays of suitable nanotubes on the surface, and to attach the necessary nanoparticles to them. Earlier publications by this team have shown that carpet-like arrays of carbon nanotubes (CNT) can be successfully grown on a variety of larger carbon substrates such as graphite, foams and fabric, which offer hierarchical multiscale supporting architecture suitable for the attachment of silver nanoparticles (AgNPs). A limiting factor of pure CNT arrays in fluid-based applications is their hydrophobicity, which can reduce the percolation of an aqueous medium through individual nanotubes. Previous studies have demonstrated that the treatment of CNT carpets with dry (oxygen) plasma can induce reversible wettability, and treatment with wet (sol-gel) coating can impart permanent wettability. In this paper, we report the influence of such treatments on the attachment of AgNPs, and their effectiveness in water disinfection treatments. Both types of hydrophilic surface treatments show an increase in silver loading on the CNT carpets. Oxygenplasma treated surfaces (O-CNTs) show fine and densely packed AgNP, whereas silica-coated nanotubes (silica-CNTs) show uneven clusters of AgNPs. However, O-CNT surfaces lose their hydrophilicity during AgNP deposition, whereas silica-CNT surfaces remain hydrophilic. This difference significantly impacts the antibacterial effectiveness of these materials, as tested in simulated water containing Gram negative Escherichia coli (E. coli, JM109). AgNPs on silicacoated CNT substrates showed significantly higher reduction rates of E. coli compared to AgNPs on plasma-treated CNT substrates, despite the finer and better dispersed AgNP distribution in the latter. These results provide important insights into different aspects of surface modification approaches that can control the wettability of CNT carpets, and their applicability in water treatment applications.

show abstract

Section: Influence Of Cnt Functionalization On Agnp Distributionsupporting

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Q1mentioning

confidence: 99%

See 1 more Smart Citation

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Carbon nanotube "carpets" are another example of hierarchical nanostructures built onto RVC [141]. An additional silica sol-gel coating or an oxygen-plasma treatment was performed to increase the wettability of the typically hydrophobic nanotube layer.…”

Section: Modified Rvc Electrodesmentioning

confidence: 99%

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

Walsh

Arenas

León

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

The limitations of 2-dimensional electrodes can be overcome by using threedimensional materials having sufficient porosity and active area while offering moderate mass transport rates and a relatively low pressure drop at controlled electrolyte flow rate. In concept, a wide variety of metal, ceramic and composite materials are possible but restrictions are imposed by the need to avoid materials degradation, while maintaining adequate electrical conductivity, sufficient robustness and the possibility of facile scale-up. Despite its fragility, one of the traditional electrode materials used as a porous, 3-dimensional electrode is carbon foam, particularly in the 97% vol. porous form of reticulated vitreous carbon, RVC. A timeline indicates that the history of this material dates back over 50 years to the mid1960s, when it was primarily used as an uncoated material in small-scale, laboratory electroanalysis. Surface modification and diverse coatings have considerably extended the use of RVC. Recent applications are found in sensors and monitors, electrosynthesis, environmental processing and energy conversion. This review highlights the fundamental structure and summarises the physicochemical properties of RVC. Fluid flow through various porosity grades of the material, their active electrochemical area and rates of mass transport are quantified. The diverse applications of RVC in energy conversion, environmental treatment and electrosynthesis are illustrated by selected examples from the authors' laboratories and others over the last 30 years. Recent research on coated RVC, energy conversion environmental remediation and sensors is highlighted. Critical areas deserving further research and development are proposed.

show abstract

“…In this study, we engineered multiscale hierarchy into carbonbased materials with controlled nanoscale (nano-roughness, wettability) and microscale features (highly interconnected pores vs highly aligned fibers). More specifically, we processed carbon materials into two types of multiscale hierarchical scaffolds; namely, interconnected porous carbon foams [24] and aligned carbon fiber mats. The 200-500 lm size micro-pores with wall width of 50-80 lm were structural repeating units in reticulated carbon foams while carbon microfibers (diameter 5-6 lm) were repeating units in aligned carbon fiber mats.…”

Section: Introductionmentioning

confidence: 99%

Carbon-based hierarchical scaffolds for myoblast differentiation: Synergy between nano-functionalization and alignment

et al. 2016

Self Cite

View full text Add to dashboard Cite

Due to limited regenerative potential of skeletal muscle, strategies stimulating regeneration of functional muscles are important. These strategies are aimed at promoting differentiation of progenitor cells (myoblasts) into multinucleated myotubes, a key initial step in functional muscle regeneration. Recent tissue engineering approaches utilize various scaffolds ranging from decellularized matrices to aligned biomaterial scaffolds. Although, majority of them have focused on nano- or microscale organization, a systematic approach to build the multiscale hierarchy into these scaffolds is lacking. Here, we engineered multiscale hierarchy into carbon-based materials and demonstrated that the nanoscale features govern the differentiation of individual myoblasts into myocytes whereas microscale alignment cues orchestrate fusion of multiple myocytes into multinucleated myotubes underlining the importance of multiscale hierarchy in enhancing coordinated tissue regeneration.

show abstract

Tuning the surface wettability of carbon nanotube carpets in multiscale hierarchical solids

Cited by 19 publications

References 31 publications

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

Carbon-based hierarchical scaffolds for myoblast differentiation: Synergy between nano-functionalization and alignment

Contact Info

Product

Resources

About