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2012

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Articles 1 - 30 of 280

Full-Text Articles in Nanoscience and Nanotechnology

Multi-Scale Models For Sulfonated Cross-Linked Poly (1, 3-Cyclohexadiene) Polymer, Qifei Wang, David Keffer, Suxiang Deng, Jimmy Mays May 2013

Multi-Scale Models For Sulfonated Cross-Linked Poly (1, 3-Cyclohexadiene) Polymer, Qifei Wang, David Keffer, Suxiang Deng, Jimmy Mays

Jimmy W. Mays

Atomistic and coarse-grained (CG) models of cross-linked sulfonated Poly (1, 3-cyclohexadiene) (xsPCHD) were developed and implemented in Molecular Dynamics (MD) simulations of PCHD chains with different architectures. In the atomistic model, PCHD chains are cross linked by a sulfur–sulfur bond. Sulfonic acid groups are evenly distributed along the chain. The architecture is specifically aimed for application as a proton exchange membrane used in fuel cells. An atomistic force field for this architecture was tested and applied in the atomistic MD simulation of xsPCHD for the first time. The atomistic simulations generate the density and cross-linker separation distribution. To further ...


Suppressing Leakage By Localized Doping In Si Nanotransistor Channels, Jesse Maassen, Hong Guo Dec 2012

Suppressing Leakage By Localized Doping In Si Nanotransistor Channels, Jesse Maassen, Hong Guo

Birck and NCN Publications

By first principles atomistic analysis we demonstrate how controlled localized doping distributions in nanoscale Si transistors can suppress leakage currents. We consider dopants (B and P atoms) to be randomly confined to a approximate to 1 nmwidth doping region in the channel. If this region is located away from the electrodes, roughly 20% of the channel length L, the tunneling leakage is reduced 2x compared to the case of uniform doping and shows little variation. Oppositely, we find the leakage current increases by orders of magnitude and may result in large device variability. We calculate the maximum and minimum conductance ...


Ict For Poverty Alleviation In Pacific Island Nations: Study Of Icts4d In Fiji, Deogratias Harorimana, Opeti Rokotuinivono, Emali Sewale, Fane Salaiwai, Marica Naulu, Evangelin Roy Dec 2012

Ict For Poverty Alleviation In Pacific Island Nations: Study Of Icts4d In Fiji, Deogratias Harorimana, Opeti Rokotuinivono, Emali Sewale, Fane Salaiwai, Marica Naulu, Evangelin Roy

Dr Deogratias Harorimana

ICT for Poverty Alleviation in Pacific Island Nations: Study of ICTs4D in Fiji There has been a vague and little knowledge on the role or potential of Information and Communications Technologies (ICTs) in relation to addressing poverty in Fiji. This may be probably due to the newness of the technology in the South Pacific Region as a whole but also probably due to the fact that only 9.7% of the current Fiji 931,000 populations are internet users (ITC Figures 2011). This paper reports on finding how ICTs is contributing towards poverty alleviation in Fiji. On the basis of ...


Real Time X-Ray Studies During Nanostructure Formation On Silicon Via Low Energy Ion Beam Irradiation Using Ultrathin Iron Films, Osman El-Atwani, Anastassiya Suslova, Alexander Demasi, Sean Gonderman, Justin Fowler, Mohamad El-Atwani, Karl Ludwig, Jean Paul Allain Dec 2012

Real Time X-Ray Studies During Nanostructure Formation On Silicon Via Low Energy Ion Beam Irradiation Using Ultrathin Iron Films, Osman El-Atwani, Anastassiya Suslova, Alexander Demasi, Sean Gonderman, Justin Fowler, Mohamad El-Atwani, Karl Ludwig, Jean Paul Allain

Birck and NCN Publications

Real time grazing incidence small angle x-ray scattering and x-ray fluorescence (XRF) are used to elucidate nanodot formation on silicon surfaces during low energy ion beam irradiation of ultrathin iron-coated silicon substrates. Four surface modification stages were identified: (1) surface roughening due to film erosion, (2) surface smoothing and silicon-iron mixing, (3) structure formation, and (4) structure smoothing. The results conclude that 2.5 x 10(15) iron atoms in a 50 nm depth triggers surface nanopatterning with a correlated nanodots distance of 25 nm. Moreover, there is a wide window in time where the surface can have correlated nanostructures ...


Universal Programmable Quantum Circuit Schemes To Emulate An Operator, Anmer Daskin, Ananth Grama, Giorgos Kollias, Sabre Kais Dec 2012

Universal Programmable Quantum Circuit Schemes To Emulate An Operator, Anmer Daskin, Ananth Grama, Giorgos Kollias, Sabre Kais

Birck and NCN Publications

Unlike fixed designs, programmable circuit designs support an infinite number of operators. The functionality of a programmable circuit can be altered by simply changing the angle values of the rotation gates in the circuit. Here, we present a new quantum circuit design technique resulting in two general programmable circuit schemes. The circuit schemes can be used to simulate any given operator by setting the angle values in the circuit. This provides a fixed circuit design whose angles are determined from the elements of the given matrix-which can be non-unitary-in an efficient way. We also give both the classical and quantum ...


The Effect Of Native Oxide On Ion-Sputtering-Induced Nanostructure Formation On Gasb Surfaces, Osman El-Atwani, Jean Paul Allain, Anastassiya Suslova Dec 2012

The Effect Of Native Oxide On Ion-Sputtering-Induced Nanostructure Formation On Gasb Surfaces, Osman El-Atwani, Jean Paul Allain, Anastassiya Suslova

Birck and NCN Publications

We have investigated the influence of native oxides on ion-sputtering-induced nanostructure formation on GaSb using in situ low energy ion scattering spectroscopy (LEISS) and X-ray photoelectron spectroscopy (XPS). Comparing an oxygen-free sample with a native oxide sample, LEISS and XPS reveal the effect of oxygen in generating higher surface Ga fractions during early stages (fluences of 1 x 10(15)-1 x 10(16) cm(-2)) of low energy (< 100 eV) Ar+ irradiation. Enhanced surface Ga and Ga2O3 fractions were also observed on "oxide free" samples exposed to air following irradiation. The results suggest preferential Ga oxidation and segregation on the top of the amorphous layer if oxygen is present on the surface. In addition, the native oxide also increases the fluence threshold for nanopatterning of GaSb surfaces by almost a factor of four during low energy irradiation. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772980]


An Investigation Of The Optical Properties Of Disordered Silicon Nanowire Mats, Hua Bao, Weixia Zhang, Liangliang Chen, Haoxiang Huang, Chen Yang, Xiulin Ruan Dec 2012

An Investigation Of The Optical Properties Of Disordered Silicon Nanowire Mats, Hua Bao, Weixia Zhang, Liangliang Chen, Haoxiang Huang, Chen Yang, Xiulin Ruan

Birck and NCN Publications

Optical reflectance spectra of three disordered silicon nanowire mats with average diameters of 40, 60, and 80 nm are investigated both experimentally and theoretically. The total hemispherical reflectance spectra from 200 to 1600 nm wavelength are first measured. All three samples exhibit reflectance about 15% to 20% within the ultraviolet band. As the wavelength becomes longer, the reflectance will first increase to around 50% and then decrease to below 20%. Such reflectance spectra are attributed to the combined effect of silicon dielectric function, the nanowire geometry, and the volume fraction of the mats. An analytical method based on Mie scattering ...


2011 Nanoelectronic Devices For Defense & Security (Nano-Dds) Conference: A Request For Funding To Support Attendee Participation. To Be Held Aug. 29 To Sept 1, 2011 At Nyu-Poly, Carl P. Tripp Dec 2012

2011 Nanoelectronic Devices For Defense & Security (Nano-Dds) Conference: A Request For Funding To Support Attendee Participation. To Be Held Aug. 29 To Sept 1, 2011 At Nyu-Poly, Carl P. Tripp

University of Maine Office of Research Administration: Grant Reports

Intellectual Merit: The Nanoelectronic Devices for Defense & Security (NANO-DDS) Conference is a bi-annual science and technology event which has been organized for the purpose of reviewing the evolving research and development (R&D) activities in the arena of nanoelectronic devices that have direct relevance to critical capability needs for national defense & security in the future. The charter of this special conference is to unify and focus the very broad array of nanoelectronic and supporting nanotechnology activities that are currently engaged in reaching the long expected applications payoffs in core defense and security related areas such as sensing, data processing, computation ...


Breast On-A-Chip: Mimicry Of The Channeling System Of The Breast For Development Of Theranostics, Meggie Grafton, Lei Wang, Pierre-Alexandre Vidi, James Leary, Sophie Lelievre Dec 2012

Breast On-A-Chip: Mimicry Of The Channeling System Of The Breast For Development Of Theranostics, Meggie Grafton, Lei Wang, Pierre-Alexandre Vidi, James Leary, Sophie Lelievre

Dr Lei Wang

Improved detection and therapy of breast neoplasia might benefit from nanodevices traveling inside mammary ducts. However, the decreasing size of branched mammary ducts prevents access to remote areas of the ductal system using a pressure-driven fluid-based approach. Magnetic field guidance of superparamagnetic submicron particles (SMPs) in a stationary fluid might provide a possible alternative but it is critical to first reproduce the breast ductal system to assess the use of such devices for future therapeutic & diagnostic ("theranostic'') purposes. Here we describe the engineering of a portion of a breast ductal system using polydimethylsiloxane (PDMS) microfluidic channels with a total volume ...


Increased Normal Incidence Photocurrent In Quantum Dot Infrared Photodetectors, Jiayi Shao, Thomas E. Vandervelde, Ajit Barve, Andreas Stintz, Sanjay Krishna Dec 2012

Increased Normal Incidence Photocurrent In Quantum Dot Infrared Photodetectors, Jiayi Shao, Thomas E. Vandervelde, Ajit Barve, Andreas Stintz, Sanjay Krishna

Birck and NCN Publications

We have increased the ratio of s-polarization (normal incidence) to p-polarization photocurrent to 50% in a quantum dot-in-a-well based infrared photodetector form the typical s-p polarization ratio about 20%. This improvement was achieved by engineering the dot geometry and the quantum confinement via post growth capping materials of the Stranski Krastanov growth mode quantum dots (QDs). The TEM images show that the height to base ratio of shape engineered QDs was increased to 8 nm/12 nm from the control sample's ratio 4 nm/17 nm. The dot geometry correlates with the polarized photocurrent measurements of the detector. (C ...


Controlled Synthesis Of One Dimensional Nanostructured Materials And Their Applications As Catalyst Supports In Proton Exchange Membrane Fuel Cells, Mohammad Norouzi Banis Dec 2012

Controlled Synthesis Of One Dimensional Nanostructured Materials And Their Applications As Catalyst Supports In Proton Exchange Membrane Fuel Cells, Mohammad Norouzi Banis

Electronic Thesis and Dissertation Repository

Nanomaterials have attracted significant interest in the past decade due to their unique structure and properties compared to their bulk counterparts. Nanomaterials-based solutions can address challenges in various technologies such as proton exchange membrane fuel cells (PEMFCs). PEMFC is an innovative energy conversion technology to directly convert chemical energy to electrical energy by using hydrogen as fuel. However, the current PEMFC system still faces significant technological roadblocks which have to be overcome before the system can become economically viable. A major impediment to the commercialization of PEMFC is the high cost of materials and manufacturing and stability, which is primarily ...


Silica Nanoparticle-Based Coatings With Superhydrophilic And Superhydrophobic Properties, Robert Andrew Fleming Dec 2012

Silica Nanoparticle-Based Coatings With Superhydrophilic And Superhydrophobic Properties, Robert Andrew Fleming

Theses and Dissertations

Superhydrophilic and superhydrophobic surfaces have potential for implementation into a variety of fields, including self-cleaning surfaces, anti-fogging transparent materials, and biomedical applications. In this study, sandblasting, oxygen plasma treatments, silica nanoparticle films, and a low surface energy fluorocarbon film were employed to change the natural surface wettability of titanium, glass, and polyethylene terephthalate (PET) substrates, with an aim to produce superhydrophilic and superhydrophobic behavior. The effects of these surface modifications are characterized by water contact angles (WCAs), surface wetting stability, surface morphology and roughness, surface elemental composition, and optical transmittance measurements. The results show that stable superhydrophilic and superhydrophobic surfaces ...


Distribution Map Of Multi-Walled Carbon Nanotubes In A Refrigerant/Oil Mixture Within A 2.5 Ton Unitary Air-Conditioner, Warren Russell Long Dec 2012

Distribution Map Of Multi-Walled Carbon Nanotubes In A Refrigerant/Oil Mixture Within A 2.5 Ton Unitary Air-Conditioner, Warren Russell Long

Theses and Dissertations

In recent years, nanoparticles have received considerable attention as a potential additive to heat transfer fluids (i.e. refrigerant) in order to increase the heat transfer capabilities of these fluids. The potential of carbon nanotubes (CNTs) to exit the compressor, migrate throughout a vapor compression air conditioning system, and possibly foul the components of such a system was experimentally investigated in this research. Six grams of CNTs were dispersed in the polyol ester oil used by a 2.5 ton (8.79 kW) unitary air conditioning system, which was continuously operated for 168 hours. After this time, the unit was ...


Development Of Nano-Zro2 Reinforced Self-Flowing Low And Ultra Low Cement Refractory Castables, Cem Gogtas Dec 2012

Development Of Nano-Zro2 Reinforced Self-Flowing Low And Ultra Low Cement Refractory Castables, Cem Gogtas

Theses and Dissertations

The main goal of this research is to develop high strength high toughness nano-ZrO2 reinforced self flow low cement (5%) and ultra low cement (3 and 1%) castables based on tabular alumina. In processing these castables, the Andreassen model was used to obtain optimum self flow properties in both, low and ultra low castables. The castables thus produced were fired at 110 and 1000, 1300 and 1500oC and the phases obtained were investigated by X-ray diffraction (XRD) including energy dispersive X-ray (EDX), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and differential thermal analysis (DTA). In addition, the other castable properties ...


Note: A Transimpedance Amplifier For Remotely Located Quartz Tuning Forks, Ethan Kleinbaum, Gabor Csathy Dec 2012

Note: A Transimpedance Amplifier For Remotely Located Quartz Tuning Forks, Ethan Kleinbaum, Gabor Csathy

Birck and NCN Publications

The cable capacitance in cryogenic and high vacuum applications of quartz tuning forks imposes severe constraints on the bandwidth and noise performance of the measurement. We present a single stage low noise transimpedance amplifier with a bandwidth exceeding 1 MHz and provide an in-depth analysis of the dependence of the amplifier parameters on the cable capacitance. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769271]


Synthesis And Characterizations Of Pyridinium Salts Including Poly(Pyridinium Salt)S And Their Applications, Tae Soo Jo Dec 2012

Synthesis And Characterizations Of Pyridinium Salts Including Poly(Pyridinium Salt)S And Their Applications, Tae Soo Jo

UNLV Theses, Dissertations, Professional Papers, and Capstones

Pyridinium salts, both molecular and polymeric, are an interesting class of multifunctional materials that exhibit liquid-crystalline and light-emitting properties. Moreover, their properties can be easily tuned by introducing new types of anions or by modifying their chemical structures. This dissertation describes synthesis and characterization of poly(pyridinium salt)s containing macrocounterions and fluorene moieties in their backbones, synthesis and characterization of nanocomposites of poly(pyridinium salt)s with single-walled carbon nanotubes via non-covalent interactions, and synthesis and characterizations of pyridinium salts having different aliphatic linkages and their application in organic acid sensing.

First, all of these ionic polymers were prepared ...


Design, Fabrication, Testing Of Cnt Based Isfet And Characterization Of Nano/Bio Materials Using Afm, Zhuxin Dong Dec 2012

Design, Fabrication, Testing Of Cnt Based Isfet And Characterization Of Nano/Bio Materials Using Afm, Zhuxin Dong

Theses and Dissertations

A combination of Carbon Nanotubes (CNTs) and Ion Selective Field Effect Transistor (ISFET) is designed and experimentally verified in order to develop the next generation ion concentration sensing system. Micro Electro-Mechanical System (MEMS) fabrication techniques, such as photolithography, diffusion, evaporation, lift-off, packaging, etc., are required in the fabrication of the CNT-ISFET structure on p-type silicon wafers. In addition, Atomic Force Microscopy (AFM) based surface nanomachining is investigated and used for creating nanochannels on silicon surfaces. Since AFM based nanomanipulation and nanomachining is highly controllable, nanochannels are precisely scratched in the area between the source and drain of the FET where ...


Refractive Index Chemical Sensing With Noble Metal Nanoparticles, Phillip Blake Dec 2012

Refractive Index Chemical Sensing With Noble Metal Nanoparticles, Phillip Blake

Theses and Dissertations

Chemical sensing is a key component in modern society, especially in engineering applications. Because of their widespread impact, improvements to chemical sensors are a significant area of research. One class of sensors, plasmonic sensors, is being heavily researched because of their ability to detect low levels of analyte in near real time without destroying the analyte. This work studies a new class of plasmonic sensor that utilizes diffractive coupling to improve sensor performance. Specifically, this work outlines the first study of diffractive coupling sensors with typical nanoparticle shapes. Sensitivity of this new class of sensor is directly compared to typical ...


Modeling, Fabrication And Characterization Of Scalable Electroless Gold Plated Nanostructures For Enhanced Surface Plasmon Resonance, Gyoung Gug Jang Dec 2012

Modeling, Fabrication And Characterization Of Scalable Electroless Gold Plated Nanostructures For Enhanced Surface Plasmon Resonance, Gyoung Gug Jang

Theses and Dissertations

The scientific and industrial demand for controllable thin gold (Au) film and Au nanostructures is increasing in many fields including opto-electronics, photovoltaics, MEMS devices, diagnostics, bio-molecular sensors, spectro-/microscopic surfaces and probes. In this study, a novel continuous flow electroless (CF-EL) Au plating method is developed to fabricate uniform Au thin films in ambient condition. The enhanced local mass transfer rate and continuous deposition resulting from CF-EL plating improved physical uniformity of deposited Au films and thermally transformed nanoparticles (NPs). Au films and NPs exhibited improved optical photoluminescence (PL) and surface plasmon resonance (SPR), respectively, relative to batch immersion EL ...


Pulse Sharpening Effects Of Thin Film Ferroelectric Transmission Lines, Robert J. Sleezer Dec 2012

Pulse Sharpening Effects Of Thin Film Ferroelectric Transmission Lines, Robert J. Sleezer

Theses and Dissertations

Advances in material science have resulted in the development of electrically nonlinear high dielectric thin film ferroelectrics, which have led to new opportunities for the creation of novel devices. This dissertation investigated one such device: a low voltage nonlinear transmission line (NLTL). A finite element simulation of ferroelectric transmission lines showed that NLTLs are capable of creating shockwaves. Additionally, if the losses are kept sufficiently low, it was shown that voltage gain should be possible. Furthermore, a method of accounting for material dispersion was developed. Results from simulations including material dispersion showed that temporal solitons might be possible from a ...


Quantum Dot Deposition Into Pdms And Application Onto A Solar Cell, Christopher Marcus Botros, Richard N. Savage Dec 2012

Quantum Dot Deposition Into Pdms And Application Onto A Solar Cell, Christopher Marcus Botros, Richard N. Savage

Master's Theses and Project Reports

Research to increase the efficiency of conventional solar cells is constantly underway. The goal of this work is to increase the efficiency of conventional solar cells by incorporating quantum dot (QD) nanoparticles in the absorption mechanism. The strategy is to have the QDs absorb UV and fluoresce photons in the visible region that are more readily absorbed by the cells. The outcome is that the cells have more visible photons to absorb and have increased power output. The QDs, having a CdSe core and a ZnS shell, were applied to the solar cells as follows. First, the QDs were synthesized ...


Energy Trapping Of Thickness-Shear And Thickness-Twist Modes In A Partially Electroded At-Cut Quartz Resonator, Huijing He, Guoquan Nie, Jinxi Liu, Jiashi Yang Dec 2012

Energy Trapping Of Thickness-Shear And Thickness-Twist Modes In A Partially Electroded At-Cut Quartz Resonator, Huijing He, Guoquan Nie, Jinxi Liu, Jiashi Yang

Mechanical & Materials Engineering Faculty Publications

The thickness-shear and thickness-twist vibrations of a finite and partially electroded AT-cut quartz resonator are investigated. The equations of anisotropic elasticity are used with the omission of the small elastic constant c56 . An analytical solution is obtained using Fourier series from which the free vibration resonant frequencies, mode shapes, and energy trapping are calculated and examined.


The Impact Of Controlled Solvent Exposure On The Morphology, Structure And Function Of Bulk Heterojunction Solar Cells, Raghavendra Hegde Nov 2012

The Impact Of Controlled Solvent Exposure On The Morphology, Structure And Function Of Bulk Heterojunction Solar Cells, Raghavendra Hegde

Raghavendra R Hegde Dr

Films of poly(3-hexyl thiophene) (P3HT):[6,6]-phenyl C61-butyric acid methyl ester (PCBM) were controllably exposed to CS2 vapor in a column with a linear solvent vapor pressure gradient. Changes in the morphology of the P3HT:PCBM thin film were monitored and correlated to the ability of this thin film to act as the active layer in an organic solar cell. The results show that the crystallinity and crystal size of the P3HT increase initially with solvent vapor pressure and annealing time, but longer exposure to solvent decreases P3HT crystallinity and photovoltaic efficiency. Neutron reflectivity indicates that the PCBM ...


Contrasting Energy Scales Of Reentrant Integer Quantum Hall States, Nianpei Deng, J. D. Watson, L. P. Rokhinson, M. J. Manfra, G. A. Csathy Nov 2012

Contrasting Energy Scales Of Reentrant Integer Quantum Hall States, Nianpei Deng, J. D. Watson, L. P. Rokhinson, M. J. Manfra, G. A. Csathy

Birck and NCN Publications

We report drastically different onset temperatures of the reentrant integer quantum Hall states in the second and third Landau level. This finding is in quantitative disagreement with the Hartree-Fock theory of the bubble phases which is thought to describe these reentrant states. Our results indicate that the number of electrons per bubble in either the second or the third Landau level is likely different than predicted.


Conductivity Of An Atomically Defined Metallic Interface, David J. Oliver, Jesse Maassen, Mehdi El Ouali, William Paul, Till Hagedorn, Yoichi Miyahara, Yue Qi, Hong Guo, Peter Gruetter Nov 2012

Conductivity Of An Atomically Defined Metallic Interface, David J. Oliver, Jesse Maassen, Mehdi El Ouali, William Paul, Till Hagedorn, Yoichi Miyahara, Yue Qi, Hong Guo, Peter Gruetter

Birck and NCN Publications

A mechanically formed electrical nanocontact between gold and tungsten is a prototypical junction between metals with dissimilar electronic structure. Through atomically characterized nanoindentation experiments and first-principles quantum transport calculations, we find that the ballistic conduction across this intermetallic interface is drastically reduced because of the fundamental mismatch between swave-likemodes of electron conduction in the gold and d wave-like modes in the tungsten. The mechanical formation of the junction introduces defects and disorder, which act as an additional source of conduction losses and increase junction resistance by up to an order of magnitude. These findings apply to nanoelectronics and semiconductor device ...


Communications And Energy-Harvesting In Nanosensor Networks, Michele C. Weigle Nov 2012

Communications And Energy-Harvesting In Nanosensor Networks, Michele C. Weigle

Computer Science Presentations

PDF of a powerpoint presentation from the National Science Foundation (NSF) Workshop on Biological Computations and Communications in Boston, Massachusetts, November 9, 2012. Also available on Slideshare.


Research Inequality In Nanomedicine, Thomas Woodson Nov 2012

Research Inequality In Nanomedicine, Thomas Woodson

Thomas Woodson

The 10-90 gap is an idea in the healthcare literature that less than 10%of all research funding goes to solving health problems that are 90%of the global disease burden. This paper examines whether there is inequality in nanotechnology healthcare research (nanomedicine). To understand the inequality in nanomedicine, I conducted a bibliometric review of Web of Science and PubMed databases. Overall there is not large inequality in nanomedicine research. The bibliometric analysis shows that most nanomedicine research is done in high income countries, but their research portfolios extend beyond rich world diseases like Alzheimer’s disease and diabetes to ...


Study On Pore Distribution And Formation Rule Of Sepiolite Mineral Nanomaterials, Qingguo Tang, Fei Wang, Mengran Tang, Jinsheng Liang, Chongyan Ren Nov 2012

Study On Pore Distribution And Formation Rule Of Sepiolite Mineral Nanomaterials, Qingguo Tang, Fei Wang, Mengran Tang, Jinsheng Liang, Chongyan Ren

Electrical and Computer Engineering Faculty Publications

Theoretical research and specific surface area analysis of nitrogen adsorption indicated that a lot of structural micropores exist in sepiolite minerals fibers. However, the microporous size, existing form, and the distribution relationship between microporous structures were not proved yet. In this paper, the section TEM samples of nanofibers were prepared on the basis of the metal embedding and cutting technique, and the inner structure of sepiolite nanofibers was observed by TEM. The results showed that sepiolite fibers have multiplayer structure similar to concentric circles, and many micropores with the size of about 2–5 nm are normal and parallel to ...


Nonlinear Dynamics Of The Atomic Force Microscope At The Liquid-Solid Interface, Daniel Kiracofe, Arvind Raman Nov 2012

Nonlinear Dynamics Of The Atomic Force Microscope At The Liquid-Solid Interface, Daniel Kiracofe, Arvind Raman

Birck and NCN Publications

The measurement of intermolecular forces at the liquid-solid interface is key to many studies of electrochemistry, wetting, catalysis, biochemistry, and mechanobiology. The atomic force microscope (AFM) is unique in its ability to measure and map these forces with nanometer resolution using the oscillating sharp tip of an AFM cantilever. These surface forces are only measured by observing the changes they induce in the dynamics of the resonant AFM probe. However, AFM cantilever dynamics at this interface can be significantly different when compared to air/vacuum environments due to the nature of nanoscale forces at the interface and the low-quality factors ...


Nanobarcoding: Detecting Nanoparticles In Biological Samples Using In Situ Polymerase Chain Reaction, Trisha Eustaquio, James F. Leary Nov 2012

Nanobarcoding: Detecting Nanoparticles In Biological Samples Using In Situ Polymerase Chain Reaction, Trisha Eustaquio, James F. Leary

Birck and NCN Publications

Background: Determination of the fate of nanoparticles (NPs) in a biological system, or NP biodistribution, is critical in evaluating an NP formulation for nanomedicine. Current methods to determine NP biodistribution are greatly inadequate, due to their limited detection thresholds. Herein, proof of concept of a novel method for improved NP detection based on in situ polymerase chain reaction (ISPCR), coined "nanobarcoding," is demonstrated. Methods: Nanobarcoded superparamagnetic iron oxide nanoparticles (NB-SPIONs) were characterized by dynamic light scattering, zeta potential, and hyperspectral imaging - measurements. Cellular uptake of Cy5-labeled NB-SPIONs (Cy5-NB-SPIONs) was imaged by confocal microscopy. The feasibility of the nanobarcoding method was ...