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Damage arrest mechanisms in nanoparticle interleaved composite interfaces

Subramanian, N. (author), Bisagni, C. (author)

The effectiveness of carbonaceous nanoparticles in arresting and delaying damage in nanocomposites has been attributed to multiscale toughening mechanisms. To explore their application in joined interfaces of composites, this study investigates the use of carbon nanotube (CNT) interleaved films for co-cured joining of composite parts and their...

conference paper 2022

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EBSD characterization of Al7075/graphene nanoplates/carbon nanotubes composites processed through post-deformation annealing

Imanian Ghazanlou, Siavash (author), Eghbali, Baitallah (author), Petrov, R.H. (author)

The effects of the post-deformation annealing on the microstructural evolution of hot rolled Al7075 matrix composites reinforced with CNTs and GNPs were investigated. The multi-pass hot rolling was applied on the stir cast samples. Annealing was then applied to the composites at 450 °C for 4 h. Microstructural evolution was examined by SEM,...

journal article 2021

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H₂O₂ Production at Low Overpotentials for Electroenzymatic Halogenation Reactions

Bormann, Sebastian (author), van Schie, M.M.C.H. (author), Pedroso de Almeida, T. (author), Zhang, W. (author), Stöckl, Markus (author), Ulber, Roland (author), Hollmann, F. (author), Holtmann, Dirk (author)

Various enzymes utilize hydrogen peroxide as an oxidant. Such “peroxizymes” are potentially very attractive catalysts for a broad range of oxidation reactions. Most peroxizymes, however, are inactivated by an excess of H₂O₂. The electrochemical reduction of oxygen can be used as an in situ generation method for hydrogen...

journal article 2019

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Multiscale computational modeling of size effects in carbon nanotube-polymer composites

Malagu, M. (author)

The development of carbon nanotube(CNT)-polymer composites advocates for a better understanding of their physical and mechanical properties that depend on the diameter of the embedded CNTs. Given that the experimental assessment of size effects is extremely difficult, the use of numerical models can be enormously helpful. However, since size...

doctoral thesis 2017

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Thermophoretic transport of ionic liquid droplets in carbon nanotubes

Rajegowda, Rakesh (author), Kannam, Sridhar Kumar (author), Hartkamp, Remco (author), Sathian, Sarith P. (author)

Thermal-gradient induced transport of ionic liquid (IL) and water droplets through a carbon nanotube (CNT) is investigated in this study using molecular dynamics simulations. Energetic analysis indicates that IL transport through a CNT is driven primarily by the fluid-solid interaction, while fluid-fluid interactions dominate in water-CNT...

journal article 2017

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Multi-Scale Material and Technology for Heterogeneous Integration

Poelma, R.H. (author)

This thesis describes a series of experiments and fabrication methods on high-aspect-ratio 3D microstructures for wafer level packaging and 3D heterogeneous system integration (3D-HSI) using novel materials such as carbon nanotubes and thick-film photo-resists. Furthermore, theoretical and experimental research efforts are made to understand the...

doctoral thesis 2016

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Tailoring the Mechanical Properties of High-Aspect-Ratio Carbon Nanotube Arrays using Amorphous Silicon Carbide Coatings

Poelma, R.H. (author), Morana, B. (author), Vollebregt, S. (author), Schlangen, H.E.J.G. (author), Van Zeijl, H.W. (author), Fan, X. (author), Zhang, G.Q. (author)

The porous nature of carbon nanotube (CNT) arrays allows for the unique opportunity to tailor their mechanical response by the infiltration and deposition of nanoscale conformal coatings. Here, we fabricate novel photo-lithographically defined CNT pillars that are conformally coated with amorphous silicon carbide (a-SiC) to strengthen the...

journal article 2014

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Photocurrent in Carbon Nanotubes

Barkelid, K.M. (author)

doctoral thesis 2014

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Carbon Nanotubes as Vertical Interconnects in 3D Integrated Circuits

Vollebregt, S. (author)

Interconnects in integrated circuits (IC) are the major cause of power dissipation and delay. 3D integration has been proposed as a method to reduce these issues. For this 3D integration, fabrication of high aspect ratio reliable vertical interconnects (vias) are required. For this new materials, like carbon nanotubes (CNT), are being considered...

doctoral thesis 2014

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Submicrosecond-timescale readout of carbon nanotube mechanical motion

Meerwaldt, H.B. (author), Johnston, S.R. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

We report fast readout of the motion of a carbon nanotube mechanical resonator. A close-proximity high electron mobility transistor amplifier is used to increase the bandwidth of the measurement of nanotube displacements from the kHz to the MHz regime. Using an electrical detection scheme with the nanotube acting as a mixer, we detect the...

journal article 2013

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Thermal conductivity of low temperature grown vertical carbon nanotube bundles measured using the three-? method

Vollebregt, S. (author), Banerjee, S. (author), Beenakker, K. (author), Ishihara, R. (author)

The thermal conductivity of as-grown vertical multi-walled carbon nanotubes (CNT) bundles fabricated at low temperature (500?°C) was measured using a vertical 3?-method. For this, CNT were selectively grown inside an oxide opening and sandwiched between two metal electrodes. The validity of the method was confirmed by both measurements as...

journal article 2013

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Carbon nanotubes as electromechanical resonators: Single-electron tunneling, nonlinearity, and high-bandwidth readout

Meerwaldt, H.B. (author)

A carbon nanotube (CNT) is a remarkable material and can be thought of as a single-atom thick cylinder of carbon atoms capped of with a semisphere. This is called a single-walled CNT and, depending on how the cylinder is rolled up, CNTs are either semiconducting or metallic. A CNT is made into a mechanical resonator by suspending it between two...

doctoral thesis 2013

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Josephson effects in carbon nanotube mechanical resonators and graphene

Keijzers, C.J.H. (author)

doctoral thesis 2012

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Microwave-induced nonequilibrium temperature in a suspended carbon nanotube

Hortensius, H.L. (author), Öztürk, A. (author), Zeng, P. (author), Driessen, E.F.C. (author), Klapwijk, T.M. (author)

Antenna-coupled suspended single carbon nanotubes exposed to 108?GHz microwave radiation are shown to be selectively heated with respect to their metal contacts. This leads to an increase in the conductance as well as to the development of a power-dependent DC voltage. The increased conductance stems from the temperature dependence of tunneling...

journal article 2012

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Transport Properties of Carbon-Nanotube/Cement Composites

Han, B. (author), Yang, Z. (author), Shi, X. (author), Yu, X. (author)

This paper preliminarily investigates the general transport properties (i.e., water sorptivity, water permeability, and gas permeability) of carbon-nanotube/cement composites. Carboxyl multi-walled carbon nanotubes (MWNTs) are dispersed into cement mortar to fabricate the carbon nanotubes (CNTs) reinforced cement-based composites by applying...

journal article 2012

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Imaging the formation of a p-n junction in a suspended carbon nanotube with scanning photocurrent microscopy

Buchs, G. (author), Barkelid, K.M. (author), Bagiante, S. (author), Steele, G.A. (author), Zwiller, V. (author)

We use scanning photocurrent microscopy (SPCM) to investigate individual suspended semiconducting carbon nanotube devices where the potential profile is engineered by means of local gates. In situ tunable p-n junctions can be generated at any position along the nanotube axis. Combining SPCM with transport measurements allows a detailed...

journal article 2011

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Single electron-ics with carbon nanotubes

Götz, G.T.J. (author)

We experimentally investigate Quantum Dots, formed in Carbon Nanotubes. The first part of this thesis deals with charge sensing on such quantum dots. The charge sensor is a metallic Single-electron-transistor, sensitive to the charge of a single electron on the quantum dot. We use this technique for real-time charge readout and precise tuning of...

doctoral thesis 2010

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Positioning Pd catalyst particles for carbon nanotube growth using charge patterns created with a scanning electron microscope

Zonnevylle, A.C. (author), Hagen, C.W. (author), Kruit, P. (author), Valenti, M. (author), Schmidt-Ott, A. (author)

Positioning of charged nanoparticles with the help of charge patterns in an insulator substrate is a known method. However, the creation of charge patterns with a scanning electron microscope for this is relatively new. Here a scanning electron microscope is used for the creation of localized charge patterns in an insulator, while a glowing wire...

journal article 2009

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Imaging of charge trapping in distorted carbon nanotubes by x-ray excited scanning probe microscopy

Ishii, M. (author), Hamilton, B. (author), Poolton, N. (author)

We have observed the distribution of electron trapping centers on distorted carbon nanotubes (CNTs) by a unique x-ray analysis technique that has both elemental and spatial selectivities. This technique involves the use of scanning probe microscopy (SPM) under synchrotron radiation excitation of the inner shell of carbon. The probe detects the...

journal article 2008

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Electron-capture decay rate of 7Be@C60 by first-principles calculations based on density functional theory

Morisato, T. (author), Ohno, K. (author), Ohtsuki, T. (author), Hirose, K. (author), Sluiter, M. (author), Kawazoe, Y. (author)

Carrying out a first-principles calculation assuming linear relationship between the electron density at Be nucleus and the electron-capture (EC) decay rate, we explained why 7Be@C60 shows higher EC decay rate than 7Be crystal, which was originally found experimentally by Ohtsuki et al. [Phys. Rev. Lett. 93, 112501 (2004)]. From the results of...

journal article 2008