scholarly journals Aerogels Based on Graphene Oxide with Addition of Carbon Nanotubes: Synthesis and Properties

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
F.R. Sultanov ◽  
Shin-Shem Steven Pei ◽  
M. Auyelkhankyzy ◽  
G. Smagulova ◽  
B.T. Lesbayev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Aqueous Dispersion ◽  
Chitosan Solution ◽  
Graphene Layers ◽  
Physico Chemical ◽  
Sorption Ability ◽  
High Sorption

<p>Nowadays numerous sorbents based on graphene and other carbon nanomaterials have been synthesized for the removal or collecting of oil remains due to its unique physico-chemical properties. Obtaining of aerogels based on graphene oxide and carbon nanotubes with addition of chitosan solution as a binder <br />component is shown in this paper. Aerogels were synthesized by reduction of aqueous dispersion of graphene oxide using the reducing agents, followed by ultrasonic and thermal treatment. Ultrasound destroys the graphene layers, decreasing them in size, thereby exposing new layers to form edges that already have no stabilizing carboxyl groups, which are located at the edges, and participate in the formation of bonds. The surface morphology of obtained aerogels was studied by SEM. The study of the sorption capacity showed that graphene/CNTs aerogel is characterized by short absorption time and high sorption ability that depend <br />on densities of the used solvents. All experimental results show the possibility of using the aerogels based on graphene and CNTs as sorbents for collection of oil residues.</p>

scholarly journals Adsorption of Phenol from Aqueous Solutions by Carbon Nanomaterials of One and Two Dimensions: Kinetic and Equilibrium Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
M. de la Luz-Asunción ◽  
V. Sánchez-Mendieta ◽  
A. L. Martínez-Hernández ◽  
V. M. Castaño ◽  
C. Velasco-Santos
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Electrostatic Interactions ◽  
Carbon Nanomaterials ◽  
Adsorption Process ◽  
Chemical Properties ◽  
Freundlich Isotherm ◽  
Two Dimensions ◽  
Multiwalled Carbon ◽  
Equilibrium Studies

Carbon nanomaterials have a great potential in environmental studies; they are considered as superior adsorbents of pollutants due to their physical and chemical properties. Functionalization and dimension play an important role in many functions of these nanomaterials including adsorption. In this research, adsorption process was achieved with one-dimension nanomaterials: single walled and multiwalled carbon nanotubes were used as received and after oxidation treatment also two-dimensional nanomaterials were used: graphene oxide and reduced graphene oxide. Carbon nanotubes were modified by hydrogen peroxide under microwave irradiation. The reduction of graphene oxide was achieved by using ascorbic acid.R2values obtained with the pseudo-second-order model are higher than 0.99. The results demonstrate that Freundlich isotherm provides the best fit for the equilibrium data (R2>0.94).RLvalues are between 0 and 1; this represents favorable adsorption between carbon nanomaterials and phenol. The adsorption process occurs byπ-πinteractions and hydrogen bonding and not by electrostatic interactions. The results indicate that the adsorption of phenol on carbon nanomaterials depends on the adsorbents’ surface area, and it is negatively influenced by the presence of oxygenated groups.

scholarly journals Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 957 ◽  
Author(s):  
Krzysztof Tadyszak ◽  
Jacek K. Wychowaniec ◽  
Karol Załęski ◽  
Emerson Coy ◽  
Łukasz Majchrzycki ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Chemical Properties ◽  
Fiber Axis ◽  
Paramagnetic Resonance ◽  
Physico Chemical ◽  
Reduced Graphene ◽  
Calcium Doping ◽  
Bulk Structures ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic

The arrangement of two-dimensional graphene oxide sheets has been shown to influence physico-chemical properties of the final bulk structures. In particular, various graphene oxide microfibers remain of high interest in electronic applications due to their wire-like thin shapes and the ease of hydrothermal fabrication. In this research, we induced the internal ordering of graphene oxide flakes during typical hydrothermal fabrication via doping with Calcium ions (~6 wt.%) from the capillaries. The Ca2+ ions allowed for better graphene oxide flake connections formation during the hydrogelation and further modified the magnetic and electric properties of structures compared to previously studied aerogels. Moreover, we observed the unique pseudo-porous fiber structure and flakes connections perpendicular to the long fiber axis. Pulsed electron paramagnetic resonance (EPR) and conductivity measurements confirmed the denser flake ordering compared to previously studied aerogels. These studies ultimately suggest that doping graphene oxide with Ca2+ (or other) ions during hydrothermal methods could be used to better control the internal architecture and thus tune the properties of the formed structures.

scholarly journals Graphene and its derivatives as biomedical materials: future prospects and challenges

2018 ◽  
Vol 8 (3) ◽  
pp. 20170056 ◽  
Author(s):  
Arghya Narayan Banerjee
Keyword(s):  
Tissue Engineering ◽  
Cell Culture ◽  
Graphene Oxide ◽  
Cell Growth ◽  
Drug Loading ◽  
Chemical Properties ◽  
Culture Cell ◽  
Biomedical Materials ◽  
Physico Chemical ◽  
Bio Imaging

Graphene and its derivatives possess some intriguing properties, which generates tremendous interests in various fields, including biomedicine. The biomedical applications of graphene-based nanomaterials have attracted great interests over the last decade, and several groups have started working on this field around the globe. Because of the excellent biocompatibility, solubility and selectivity, graphene and its derivatives have shown great potential as biosensing and bio-imaging materials. Also, due to some unique physico-chemical properties of graphene and its derivatives, such as large surface area, high purity, good bio-functionalizability, easy solubility, high drug loading capacity, capability of easy cell membrane penetration, etc., graphene-based nanomaterials become promising candidates for bio-delivery carriers. Besides, graphene and its derivatives have also shown interesting applications in the fields of cell-culture, cell-growth and tissue engineering. In this article, a comprehensive review on the applications of graphene and its derivatives as biomedical materials has been presented. The unique properties of graphene and its derivatives (such as graphene oxide, reduced graphene oxide, graphane, graphone, graphyne, graphdiyne, fluorographene and their doped versions) have been discussed, followed by discussions on the recent efforts on the applications of graphene and its derivatives in biosensing, bio-imaging, drug delivery and therapy, cell culture, tissue engineering and cell growth. Also, the challenges involved in the use of graphene and its derivatives as biomedical materials are discussed briefly, followed by the future perspectives of the use of graphene-based nanomaterials in bio-applications. The review will provide an outlook to the applications of graphene and its derivatives, and may open up new horizons to inspire broader interests across various disciplines.

Single-walled carbon nanotubes: differential genotoxic potential associated with physico-chemical properties

2012 ◽  
Vol 7 (2) ◽  
pp. 144-156 ◽  
Author(s):  
Bella B. Manshian ◽  
Gareth JS. Jenkins ◽  
Paul M. Williams ◽  
Chris Wright ◽  
Andrew R. Barron ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Properties ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Genotoxic Potential ◽  
Physico Chemical ◽  
Walled Carbon Nanotubes

scholarly journals Self-Assembling Peptides and Carbon Nanomaterials Join Forces for Innovative Biomedical Applications

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4084
Author(s):  
Petr Rozhin ◽  
Costas Charitidis ◽  
Silvia Marchesan
Keyword(s):  
Carbon Nanostructures ◽  
Biomedical Applications ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Building Blocks ◽  
Research Areas ◽  
Self Assembling ◽  
Concise Review ◽  
Physico Chemical ◽  
Great Progress

Self-assembling peptides and carbon nanomaterials have attracted great interest for their respective potential to bring innovation in the biomedical field. Combination of these two types of building blocks is not trivial in light of their very different physico-chemical properties, yet great progress has been made over the years at the interface between these two research areas. This concise review will analyze the latest developments at the forefront of research that combines self-assembling peptides with carbon nanostructures for biological use. Applications span from tissue regeneration, to biosensing and imaging, and bioelectronics.

scholarly journals OPPORTUNITIES OF BIOMEDICAL USE OF CARBON NANOTUBES

2014 ◽  
Vol 13 (1) ◽  
pp. 135-144
Author(s):  
I. V. Mitrofanova ◽  
I. V. Milto ◽  
I. V. Suhodolo ◽  
G. Yu. Vasyukov
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Properties ◽  
Tissue Level ◽  
Pathological Process ◽  
The Body ◽  
Therapeutic Effects ◽  
Target Delivery ◽  
Physico Chemical ◽  
Near Future ◽  
Biological And Medical Applications

Nanomaterials  –  materials,  whouse  structure  elements  has  proportions  doesn’t  exceed  100  nm.  In superdispersed state matter acquire new properties. In the last decade, carbon nanotubes become the most popular nanomaterials, that cause attention of representatives of various scientific field. The сarbon nanotubes offer new opportunities for biological and medical applications: imaging at the molecular, cellular and tissue levels, biosensors and electrodes based on carbon nanotubes, target delivery of various substances, radiation and photothermal therapy. The most promising of carbon nanotubes in the context of biomedical applications is their ability to penetrate the various tissues of the body and carry large doses of agents, providing diagnostic and therapeutic effects. Functionalized nanotubes are biodegradable. Other current direction of using carbon nanotubes in medicine and biology is to visualize objects on the molecular, cellular and tissue level. Associated with carbon nanotubes contrasting substances improve the visualization of cells and tissues, which can detected new patterns of development of the pathological process. Due to the vagueness of the question of biocompatibility and cytotoxicity of carbon nanotubes possibility of their practical application is hampered. Before the introduction of carbon nanotubes into practical health care is necessary to provide all the possible consequences of using nanotubes. High rates of properties and development of new nanostructures based on carbon nanotubes in the near future will lead to new advances related to the application and development of new parameters that will determine their properties and effects. In these review attention is paid to the structure, physico-chemical properties of nanotubes, their functionalization, pharmacokinetics and pharmacodynamics and all aspects of using of carbon nanotubes.

Electrical and piezoresistive properties of cement composites with carbon nanomaterials

2018 ◽  
Vol 52 (24) ◽  
pp. 3325-3340 ◽  
Author(s):  
Doo-Yeol Yoo ◽  
Ilhwan You ◽  
Hyunchul Youn ◽  
Seung-Jung Lee
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Carbon Nanomaterials ◽  
Peak Load ◽  
Compressive Load ◽  
Gauge Factor ◽  
Fractional Change ◽  
Graphite Nanofibers ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This study investigates the effect of nanomaterials on the piezoresistive sensing capacity of cement-based composites. Three different nanomaterials—multi-walled carbon nanotubes, graphite nanofibers, and graphene oxide—were considered along with a plain mortar, and a cyclic compressive test was performed. Based on a preliminary test, the optimum flowability was determined to be 150 mm in terms of fiber dispersion. The electrical resistivity of the composites substantially decreased by incorporating 1 wt% multi-walled carbon nanotubes, but only slightly decreased by including 1 wt% graphite nanofibers and graphene oxide. This indicates that the use of multi-walled carbon nanotubes is most effective in improving the conductivity of the composites compared to the use of graphite nanofibers and graphene oxide. The fractional change in resistivity of the composites with nanomaterials exhibited similar behavior to that of the cyclic compressive load, but partial reversibility in fractional change in resistivity was obtained beyond 60% of the peak load. A linear relationship between the fractional change in resistivity and cyclic compression strain (up to 1500 με) was observed in the composites with multi-walled carbon nanotubes, and the gauge factor was found to be 166.6. It is concluded that cement-based composites with 1 wt% multi-walled carbon nanotubes can be used as piezoresistive sensors for monitoring the stress/strain generated in concrete structures.

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