Article
Chemistry, Multidisciplinary
Emily Schifano, Gianluca Cavoto, Francesco Pandolfi, Giorgio Pettinari, Alice Apponi, Alessandro Ruocco, Daniela Uccelletti, Ilaria Rago
Summary: The emergence of multidrug-resistant bacteria is a growing threat to public health, necessitating the development of non-antibiotic antibacterial approaches. In this study, vertically aligned carbon nanotubes (VA-CNTs) with controlled nanomorphology were proposed as effective platforms for bacteria eradication. Through a combination of microscopic and spectroscopic techniques, the topography of VA-CNTs was tailored in a controlled and time-efficient manner using plasma etching processes. The highest reduction in cell viability was observed for VA-CNTs modified using plasma etching with Ar and O-2, indicating their potential as a surface for inactivating both planktonic and biofilm infections.
Article
Nanoscience & Nanotechnology
Ruiting Chen, Yafei Xue, Xinyue Xu, Hui Yang, Tengfei Qiu, Lingling Shui, Xin Wang, Guofu Zhou, Michael Giersig, Sacha Pidot, James A. Hutchison, Eser Metin Akinoglu
Summary: This study presents a lithography-free method for fabricating carbon nanotube arrays with tunable pitch and size. The pitch of the periodic arrays can be controlled by the diameter of silica particles, while the size of individual nanotubes can be adjusted by the catalyst particle size and reaction time.
Article
Nanoscience & Nanotechnology
Kevin Laughlin, Richard R. Vanfleet, Robert C. Davis
Summary: Researchers have developed VACNT/carbon composite films with higher stiffness and strength than pure VACNTs, while maintaining low reflectance. These composites can withstand water exposure and handling, making them a promising material.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Petr Rozhin, Slavko Kralj, Brigitte Soula, Silvia Marchesan, Emmanuel Flahaut
Summary: Supramolecular hydrogels formed from simple peptides can be improved by the addition of carbon nanomaterials, although their interaction with the peptide structure needs to be investigated. This study compares the performance of single-walled and double-walled carbon nanotubes as additives for a tripeptide hydrogel, with the latter showing superior results. Various spectroscopic techniques, thermogravimetric analysis, microscopy, and rheology data provide detailed insights into the structure and behavior of these nanocomposite hydrogels.
Article
Engineering, Biomedical
Luis Nascimento, Cristiana Fernandes, Ricardo. M. Silva, Angela Semitela, Barbara M. de Sousa, Paula A. A. P. Marques, Sandra I. Vieira, Rui. F. Silva, Nathalie Barroca, Gil Goncalves
Summary: A novel therapeutic approach based on carbon nanotubes (CNTs) is explored in this study to enhance the regeneration of neural cells. Different morphologies of CNTs are created and tested for their ability to stimulate the formation of neurons and networks. The findings provide a new avenue for the construction of electroresponsive scaffolds for neural tissue engineering.
ADVANCED HEALTHCARE MATERIALS
(2023)
Review
Nanoscience & Nanotechnology
August Kohls, Mackenzie Maurer Ditty, Fahimeh Dehghandehnavi, Si-Yang Zheng
Summary: Vertically aligned carbon nanotubes (VACNTs) have numerous advantages that make them highly desirable in biomedical applications. This review discusses the utilization of VACNTs in sensing, biomolecule filtration systems, cell stimulation, regenerative medicine, drug delivery, and bacteria inhibition, and compares them to the traditionally nonaligned, randomly oriented nanotubes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Lev Rovinsky, Barun Kumar Barick, Elnatan Lieberman, Efrat Shawat Avraham, Gilbert Daniel Nessim, Tamar Segal-Peretz, Noa Lachman
Summary: This article demonstrates the limitations of thin-film deposition on very rough topographies by depositing alumina on vertically aligned carbon nanotubes (VACNTs). The study shows that even when surface topography exhibits high roughness, deposition quality can be significantly hindered, affecting performances of thin-film applications. Adjusting process parameters can improve deposition quality and enhance the performance of thin-film applications in various fields.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chaminda P. Nawarathne, Abdul Hoque, Chethani K. Ruhunage, Connor E. Rahm, Noe T. Alvarez
Summary: This study presents a method for achieving chemical bonding of CNTs to metal substrates at low temperatures, bypassing the need for high temperature treatments, and successfully establishing direct connections between CNTs and metal substrates. By functionalizing metal substrates with organic species and carefully controlling the process, successful chemical bonding between CNTs and metal substrates was achieved, opening up new possibilities for electronic applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Da-Chi Yang, Richard J. J. Castellano, Ricardo Prada Silvy, Sathish K. K. Lageshetty, Robert F. F. Praino, Francesco Fornasiero, Jerry W. W. Shan
Summary: This study reports on the first macroscopic membranes with vertically oriented, subnanometer carbon nanotube (CNT) pores, which show enhanced water flow. The membranes, made using a scalable, solution-based method, exhibit fast pressure-driven water transport with up to 10^5-fold enhancement compared to conventional flow. The results also show that the hydrodynamic slip lengths increase with decreasing nanotube diameter, suggesting that water transport in small-diameter CNTs is dominated by entrance resistance.
Article
Chemistry, Physical
A. Andalouci, Y. Roussigne, L. Gangloff, P. Legagneux, S. Farhat, S. M. Cherif
Summary: In this study, vertically aligned multiwalled carbon nanotubes (MWCNTs) filled with Co magnetic nanowires were synthesized in a one-step process using bias-assisted plasma enhanced chemical vapor deposition (PECVD) method. The growth, alignment, and filling of the carbon nanotubes were achieved simultaneously by applying a negative bias to the substrate. The structural investigations revealed the growth mechanisms, and the analysis confirmed the presence of Co, Pd, C, N, and O in the nanotubes. The hysteresis cycles exhibited ferromagnetic behavior, with higher coercive field values observed for nail-shaped Co nanoparticles embedded in the CNTs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Multidisciplinary
Muthusamy Saranya, Janne T. Koivisto, Ana C. M. Carvalho, Fernando Sato, Andrea Lassenberger, Lionel Porcar, Baleeswaraiah Muchharla, Saikat Talapatra, Birgitte H. McDonagh, Lauriane Janssen, Olli Pitkanen, Minna Kellomaki, Krisztian Kordas, Gabriela S. Lorite
Summary: Injectable scaffolds are a promising strategy for tissue repair and regeneration. The design of an aligned injectable hydrogel-based scaffold via remote-induced alignment is reported in this study. The use of low magnetic field to align carboxylated multi-walled carbon nanotubes into the hydrogel is demonstrated, showing potential for engineering functional tissues with specific cell orientation.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Sabrina Roguai, Abdelkader Djelloul
Summary: In this study, gold (Au) films were deposited onto vertically aligned carbon nanotubes (CNTs) using the DC magnetron sputtering method to create supercapacitor electrodes. The resulting Au@CNTs had a porous nanostructure morphology with a high apparent surface area. The porous Au/CNTs electrodes showed a good areal capacitance compared to traditional Au-based electrodes (25.6 mF cm-2 at 5 mV/s) and excellent cycling stability (90% retention after 10,000 cycles) in a 0.5 M H2SO4 aqueous solution. This research demonstrates the advantageous use of CNTs in fabricating porous Au deposits for improved electrochemical energy storage. Furthermore, these porous structures can serve as templates for other materials in electrochemical energy storage.
Article
Nanoscience & Nanotechnology
Gongdong Wang, Mingyang Zheng, Zhendong Liu, Meng Wang
Summary: A flexible piezoresistive sensor with high anisotropy has been developed using internal vertically aligned carbon nanotubes and an external microdome structure. The sensor exhibits increased sensitivity in the pressure direction due to the synergistic effect of the carbon nanotubes and microdome structure. It has potential applications in areas such as human health monitoring, wearable electronics, and intelligent human-computer interaction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Corentin Querne, Thomas Vignal, Mathieu Pinault, Philippe Banet, Martine Mayne-Hermite, Pierre -Henri Aubert
Summary: This paper studies the influence of high density vertically aligned carbon nanotubes (VACNT) grown on different grades of aluminum collectors on electrochemical performances. VACNT electrodes exhibit high areal capacitance and average gravimetric capacitance, which are related to the thickness and volumetric density of the nanotubes. Symmetrical supercapacitor based on VACNT/Al electrodes assembled in coin-cell shows high energy and power density with high potential difference and great energy retention capacity.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Electrical & Electronic
Lucas Lum, Zhi Kai Ng, Rong Tao Jiang, Chong Wei Tan, Edwin Hang Tong Teo, Beng Kang Tay
Summary: This article reports the complex electromagnetic properties of vertically aligned carbon nanotube arrays. The VACNT arrays were found to be partially anisotropic and displayed lossy dielectric and diamagnetic behavior. This findings contribute to the design of carbon nanotube applications in high-frequency electronics in the future.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)