Search results for: A.M. Benito

Items from 1 to 20 out of 38 results

article

PM104 Morphological Characterization of Intrinsic Cardiac Nervous System Throughout Golgi-Cox Method, in Experimental Models of Heart Failure in Rats

M.D.J. Gómez, A.M. Benito

Global Heart > 2016 > 11 > 2(S) > e89

article

The effect of gamma-irradiation on few-layered graphene materials

A. Ansón-Casaos, J.A. Puértolas, F.J. Pascual, J. Hernández-Ferrer, more

Applied Surface Science > 2014 > 301 > Complete > 264-272

The effect of γ-irradiation on the structure and composition of chemically synthesized few-layered graphene materials was studied. Fully oxidized graphene oxide and graphene nanoribbons, as well as their respective chemically post-reduced forms, were treated under γ-irradiation in an air-sealed environment. Three different irradiation doses of 60, 90 and 150kGy were applied. Structure and composition...

article

Processing dependency of percolation threshold of MWCNTs in a thermoplastic elastomeric block copolymer

J.G. Meier, C. Crespo, J.L. Pelegay, P. Castell, more

Polymer > 2011 > 52 > 8 > 1788-1796

We prepared carbon nanotube thermoplastic elastomeric block copolymer nanocomposites using a commercial styrene–ethylenebutylene–styrene (SEBS) block copolymer and multiwall carbon nanotubes (MWCNTs) at different filler concentrations. Hereto we applied two different processing strategies, namely direct melt mixing and solution-precipitation. We observe that the mechanical and electrical properties...

article

Optimizing catalyst nanoparticle distribution to produce densely-packed carbon nanotube growth

E. Terrado, I. Tacchini, A.M. Benito, W.K. Maser, more

Carbon > 2009 > 47 > 8 > 1989-2001

The experimental parameters involved in the formation of the Ni catalytic nanoparticles on Si/SiO ₂ substrates that seed carbon nanotube growth were investigated. It was found that after deposition of a nickel film on the substrate, the temperature and time of the thermal and reduction catalyst pre-treatment steps are crucial variables for optimized nanoparticle distribution with different...

article

Effects of partial and total methane flows on the yield and structural characteristics of MWCNTs produced by CVD

C. Vallés, M. Pérez-Mendoza, W.K. Maser, M.T. Martínez, more

Carbon > 2009 > 47 > 4 > 998-1004

Multi-walled carbon nanotubes (MWCNTs) were produced in a chemical vapor deposition (CVD) process employing methane and argon as hydrocarbon and carrier gas over supported sol–gel Co–Mo/MgO catalysts. A detailed study about the influence of the gas flow of both hydrocarbon and carrier gas on carbon yield, morphology, structure and graphitization degree is presented. Methane partial pressure, methane...

article

Carbon nanotube networks as gas sensors for NO2 detection

I. Sayago, H. Santos, M.C. Horrillo, M. Aleixandre, more

Talanta > 2008 > 77 > 2 > 758-764

Networks of different carbon nanotube (CNT) materials were investigated as resistive gas sensors for NO ₂ detection. Sensor films were fabricated by airbrushing dispersions of double-walled and multi-walled CNTs (DWNTs and MWNTs, respectively) on alumina substrates. Sensors were characterized by resistance measurements from 25 to 250°C in air atmosphere in order to find the optimum detection...

article

The influence of single-walled carbon nanotube functionalization on the electronic properties of their polyaniline composites

E. Lafuente, M.A. Callejas, R. Sainz, A.M. Benito, more

Carbon > 2008 > 46 > 14 > 1909-1917

The “in situ” preparation and characterization of composites of polyaniline (PANI) and single-walled carbon nanotubes (SWCNTs) are reported. To improve the dispersion and compatibility with the polymer matrix the raw SWCNTs were modified following different routes. SWCNTs oxidized by chemical or thermal treatments (nitric acid and air oxidation, respectively) were subjected to covalent functionalization...

article

Carbon Nanotube Mediated Reduction in Optical Activity in Polyaniline Composite Materials.

M. inhetPanhuis, K.J. Doherty, R. Sainz, A.M. Benito, more

The Journal of Physical Chemistry C > 2008 > 112 > 5 > 1441 - 1445

article

Preparation of palladium loaded carbon nanotubes and activated carbons for hydrogen sorption

A. Ansón, E. Lafuente, E. Urriolabeitia, R. Navarro, more

Journal of Alloys and Compounds > 2007 > 436 > 1-2 > 294-297

Single wall carbon nanotubes (SWNTs) and MAXSORB activated carbon have been used as the support of palladium nanoparticles. The preparation of the palladium loaded carbon materials has been done by direct reaction between the support and a Pd (0) compound, either Pd ₂ (dba) ₃ ·CHCl ₃ or Pd(PPh ₃ ) ₄ . The efficiency of the loading reaction has been much better...

article

Important parameters for the catalytic nanoparticles formation towards the growth of carbon nanotube aligned arrays

E. Terrado, E. Muñoz, W.K. Maser, A.M. Benito, more

Diamond & Related Materials > 2007 > 16 > 4-7 > 1082-1086

Presented here is a systematic study on the experimental parameters involved in the formation of catalytic nanoparticles from homogeneous Ni films deposited by dc sputtering towards carbon nanotube (CNT) production on Si/SiO ₂ . We have found a critical temperature and time for the thermal and reduction pre-treatment processes to obtain catalyst nanoparticles with the appropriate size and...

article

CVD production of double-wall and triple-wall carbon nanotubes

C. Vallés, M. Pérez-Mendoza, M.T. Martínez, W.K. Maser, more

Diamond & Related Materials > 2007 > 16 > 4-7 > 1087-1090

Carbon nanotubes with a drastically reduced number of graphitic layers were synthesized in high yield by chemical vapor deposition of methane over a sol–gel Mo–Co catalyst supported on magnesium oxide particles. We show that both the catalyst composition and the methane flow rate strongly influence the porosity of the catalyst support, the catalyst dispersion, the degree of aromatization of the hydrocarbon...

article

Novel selective sensors based on carbon nanotube films for hydrogen detection

I. Sayago, E. Terrado, M. Aleixandre, M.C. Horrillo, more

Sensors & Actuators: B. Chemical > 2007 > 122 > 1 > 75-80

Novel resistive gas sensors based on single-walled carbon nanotubes (SWNTs) as an active sensing element have been evaluated for hydrogen detection. Sensor films were fabricated by airbrushing SWNT dispersions on alumina substrates. The employed SWNT materials were either chemically functionalized with Pd or sputtered with Pd to enhance their sensitivity to hydrogen. Sensors were characterized by...

chapter

NO2 detection with Single Walled Carbon Nanotube Networks

I. Sayago, E. Terrado, M.C. Horrillo, M. Aleixandre, more

2007 Spanish Conference on Electron Devices > 189 - 192

2007 Spanish Conference on Electron Devices

Single-walled carbon nanotube (SWNT) networks were tested as gas sensors for nitrogen dioxide detection. Sensor films were fabricated by airbrushing SWNT dispersions on alumina substrates. Sensors were characterized by resistance measurements from 25 to 200?C. The best response to NO2 was obtained at 200?C. The tested SWNT sensors were sensitive to low NO2 concentrations in nitrogen and air atmospheres...

chapter

Multi-Walled Carbon Nanotube Networks As Gas Sensors for NO2 Detection

I. Sayago, H. Santos, M.C. Horrillo, M. Aleixandre, more

TRANSDUCERS 2007 - 2007 International Solid-State Sensors, Actuators and Microsystems Conference > 1035 - 1038

TRANSDUCERS '07 & Eurosensors XXI. 2007 14th International Conference on Solid-State Sensors, Actuators and Microsystems

Multi-walled carbon nanotube (MWNT) networks were investigated as resistive gas sensors for nitrogen dioxide detection. Sensor films were fabricated by airbrushing MWNT dispersions on alumina substrates. Sensors were characterized by resistance measurements from 25 to 250degC in air atmosphere, in order to find the optimum detection temperature. The best response to NO₂ was obtained at 25degC. The...

article

Carbon nanotube growth on cobalt-sprayed substrates by thermal CVD

E. Terrado, M. Redrado, E. Muñoz, W.K. Maser, more

Materials Science & Engineering C > 2006 > 26 > 5-7 > 1185-1188

We present a very simple spray-coating method for depositing cobalt catalyst over quartz substrates that can be efficiently utilized in the production of carbon nanotubes (CNTs) by thermal chemical vapor deposition (CVD). Very uniform multi-walled carbon nanotubes (MWNTs) have been grown from cobalt catalyst over large surfaces by thermal CVD using mixtures of acetylene and ammonia. The effect of...

article

Polyazomethine/carbon nanotube composites

E. Lafuente, M. Piñol, L. Oriol, E. Muñoz, more

Materials Science & Engineering C > 2006 > 26 > 5-7 > 1198-1201

Composites were synthesized by “in-situ” polymerization of polyazomethine, a liquid crystal polymer (LCP), in presence of multi-walled carbon nanotubes (MWNTs) previously dispersed in one of the employed monomers. Fiber processing was carried out by extrusion from the composites containing 1 and 10 wt.% of MWNTs at the mesophase temperature. We have observed that the typical highly oriented internal...

article

Aligned carbon nanotubes grown on alumina and quartz substrates by a simple thermal CVD process

E. Terrado, M. Redrado, E. Muñoz, W.K. Maser, more

Diamond & Related Materials > 2006 > 15 > 4-8 > 1059-1063

A very simple spray-coating method is presented here for depositing iron salt and iron sol-gel solutions on quartz and alumina substrates that can be efficiently used to produce carbon nanotubes (CNTs) by thermal chemical vapor deposition (CVD). Aligned and curly and randomly oriented multi-walled carbon nanotubes (MWNTs) have been efficiently grown from iron catalyst over large surfaces using mixtures...

article

Ni–Y/Mo catalyst for the large-scale CVD production of multi-wall carbon nanotubes

M. Pérez-Mendoza, C. Vallés, W.K. Maser, M.T. Martínez, more

Carbon > 2005 > 43 > 14 > 3034-3037

article

Hydrogen sensors based on carbon nanotubes thin films

I. Sayago, E. Terrado, E. Lafuente, M.C. Horrillo, more

Synthetic Metals > 2005 > 148 > 1 > 15-19

Single-walled carbon nanotubes (SWNTs) produced by arc-discharge have been researched as resistive gas sensors for H ₂ detection. Raw as well as modified single-walled carbon nanotubes were utilised as sensor material. Two types of modification treatments were carried out on the as grown SWNT material; chemical functionalization with palladium and doping with palladium by sputtering.CNTs were...

article

Enhanced hydrogen adsorption on single-wall carbon nanotubes by sample reduction

M.A. Callejas, A. Ansón, A.M. Benito, W. Maser, more

Materials Science & Engineering B > 2004 > 108 > 1-2 > 120-123

The effect of the reduction of single-wall carbon nanotubes (SWNTs) samples on the hydrogen adsorption is reported. Hydrogen adsorption isotherms have been performed at 77K and until 300Torr of hydrogen pressure on raw and modified SWNTs material produced by arc-discharge using Ni/Y as catalyst at different atomic percentages. The hydrogen adsorption isotherms of the samples after hydrogen reduction...

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INFONA - science communication portal

Search results for: A.M. Benito

PM104 Morphological Characterization of Intrinsic Cardiac Nervous System Throughout Golgi-Cox Method, in Experimental Models of Heart Failure in Rats

The effect of gamma-irradiation on few-layered graphene materials

Processing dependency of percolation threshold of MWCNTs in a thermoplastic elastomeric block copolymer

Optimizing catalyst nanoparticle distribution to produce densely-packed carbon nanotube growth

Effects of partial and total methane flows on the yield and structural characteristics of MWCNTs produced by CVD

Carbon nanotube networks as gas sensors for NO2 detection

The influence of single-walled carbon nanotube functionalization on the electronic properties of their polyaniline composites

Carbon Nanotube Mediated Reduction in Optical Activity in Polyaniline Composite Materials.

Preparation of palladium loaded carbon nanotubes and activated carbons for hydrogen sorption

Important parameters for the catalytic nanoparticles formation towards the growth of carbon nanotube aligned arrays

CVD production of double-wall and triple-wall carbon nanotubes

Novel selective sensors based on carbon nanotube films for hydrogen detection

NO2 detection with Single Walled Carbon Nanotube Networks

Multi-Walled Carbon Nanotube Networks As Gas Sensors for NO2 Detection

Carbon nanotube growth on cobalt-sprayed substrates by thermal CVD

Polyazomethine/carbon nanotube composites

Aligned carbon nanotubes grown on alumina and quartz substrates by a simple thermal CVD process

Ni–Y/Mo catalyst for the large-scale CVD production of multi-wall carbon nanotubes

Hydrogen sensors based on carbon nanotubes thin films

Enhanced hydrogen adsorption on single-wall carbon nanotubes by sample reduction

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