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Full-Text Articles in Nanoscience and Nanotechnology

Application Of 3d Printing Technology In Porous Anode Fabrication For Enhanced Power Output Of Microbial Fuel Cells, Bin Bian Sep 2015

Application Of 3d Printing Technology In Porous Anode Fabrication For Enhanced Power Output Of Microbial Fuel Cells, Bin Bian

Electronic Thesis and Dissertation Repository

Microbial fuel cells (MFCs) are widely researched for application in wastewater treatment. However, the current anodes used in MFCs often suffer from high fabrication cost and uncontrollable pore sizes. In this thesis, three-dimensional printing technique was utilized to fabricate anodes with different micro pore sizes for MFCs. Copper coating and carbonization were applied to the printed polymer anodes to increase the conductivity and specific surface area. Voltages of MFCs with various anodes were measured as well as other electrochemical tests such as linear sweep voltammetry and electrochemical impedance spectroscopy. 3D copper porous anode produced higher maximum voltages and power densities ...


Field Scale Application Of Nanoscale Zero Valent Iron: Mobility, Contaminant Degradation, And Impact On Microbial Communities, Chris M.D. Kocur Aug 2015

Field Scale Application Of Nanoscale Zero Valent Iron: Mobility, Contaminant Degradation, And Impact On Microbial Communities, Chris M.D. Kocur

Electronic Thesis and Dissertation Repository

This thesis began by verifying that nanoscale zero valent iron (nZVI) synthesis methods could be scaled up and implemented at the field scale in a safe manner. This led to successful demonstration of nZVI injection and mobility under constant head gravity injection into a contaminated utility corridor in Sarnia, Ontario. Where field studies have fallen short in the past was linking the somewhat qualitative field geochemical parameters to other evidence of nZVI transport. Definitive nZVI detection was elusive in previous field studies due to the highly reactive nature of the particles caused by their high surface area. nZVI was detected ...


Nanoscaled Cellulose And Its Carbonaceous Material: Application And Local Structure Investigation, Yujie Meng Aug 2015

Nanoscaled Cellulose And Its Carbonaceous Material: Application And Local Structure Investigation, Yujie Meng

Doctoral Dissertations

In this dissertation, cellulose nanocrystals three-dimensional morphology, size distribution, and the crystal structure were statistically and quantitatively investigated. Lognormal distribution was identified as the most likely for cellulose nanocrystals’ size distribution. Height and width dimensions were shown to decrease toward the ends from the midpoint of individual CNCs, implying a spindle-like shape. XRD analysis of crystallite size accompanied with TEM and AFM measurements revealed that the cross-sectional dimensions of individual switchgrass CNC were either rectangular or elliptical shape, with an approximately 3~5 nm [nanometer] lateral element length range. A sponge-like carbon aerogel from microfibril cellulose with high porosity, ultra-low ...


In Vitro Studies Of Gold And Gold Silica Nanoparticle Radiosensitization With Kilovoltage X-Rays, Gregory Colarch May 2015

In Vitro Studies Of Gold And Gold Silica Nanoparticle Radiosensitization With Kilovoltage X-Rays, Gregory Colarch

UNLV Theses, Dissertations, Professional Papers, and Capstones

Technological advances in the ability to construct and manipulate nanoscale particles have opened up the possibility of using solid metallic nanoparticles and mixed metal nanoshells as a means to increase dose enhancement and treatment efficacy to tumors. In order for nanoparticles to be an effective form of treatment, they must be delivered to tumors in sufficient concentrations so that there is a dose enhancement factor due to ionizing radiation, as well as being essentially non-toxic to healthy cells. Gold nanoparticles and silica-gold nanoshells fit these requirements. Gold has a high atomic number (Z=79), which gives a larger cross section ...


Interactions Of Nanomaterials With Biological Systems: A Study Of Bio-Mineralized Nanoparticles And Nanoparticle Antibiotics, Jennifer Chappell Gifford Jan 2015

Interactions Of Nanomaterials With Biological Systems: A Study Of Bio-Mineralized Nanoparticles And Nanoparticle Antibiotics, Jennifer Chappell Gifford

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

Nature is continually able to out-perform laboratory syntheses of nanomaterials with control of specific properties under ambient temperatures, pressures and pH. The investigation of existing biomolecule-mediated nanoparticle synthesis provides insight and knowledge necessary for duplicating these processes. In this way, peptides or proteins with nanomaterial mediation capabilities can be: 1) explored to further understand the ways in which biomolecules create specific nanoparticles then 2) used to create genetically encodable tags for use in electron tomography. The goal of designing such a tag was to assist in closing the resolution gap that exists in current imaging techniques between approximately 5 nm ...


Integrated Nanoscale Imaging And Spatial Recognition Of Biomolecules On Surfaces, Congzhou Wang Jan 2015

Integrated Nanoscale Imaging And Spatial Recognition Of Biomolecules On Surfaces, Congzhou Wang

Theses and Dissertations

Biomolecules on cell surfaces play critical roles in diverse biological and physiological processes. However, conventional bulk scale techniques are unable to clarify the density and distribution of specific biomolecules in situ on single, living cell surfaces at the micro or nanoscale. In this work, a single cell analysis technique based on Atomic Force Microscopy (AFM) is developed to spatially identify biomolecules and characterize nanomechanical properties on single cell surfaces. The unique advantage of these AFM-based techniques lies in the ability to operate in situ (in a non-destructive fashion) and in real time, under physiological conditions or controlled micro-environments.

First, AFM-based ...


Development Of Gold Nanoparticle-Based Antigen Delivery Platform For Vaccines Against Hiv-1, Feng Lin Jan 2015

Development Of Gold Nanoparticle-Based Antigen Delivery Platform For Vaccines Against Hiv-1, Feng Lin

Graduate Theses and Dissertations

As one of the world’s most devastating viruses, HIV-1 has killed more than 39 million people, and around two million cases of newly infected individuals are recorded every year. However, no effective vaccine has been developed to stop this pandemic since its onset in the 1980s. Since vaccine development is moving slowly, delivery platforms as an essential element to enhance both the efficiency and efficacy of vaccines have drawn increased attention. Gold nanoparticles (GNPs) as a novel delivery platform has been studied in drug and vaccine delivery. My research goal is to apply this delivery platform in the AIDS ...


Carbon Nanopipettes For Advanced Cellular Probing And Microinjection, Sean Eric Anderson Jan 2015

Carbon Nanopipettes For Advanced Cellular Probing And Microinjection, Sean Eric Anderson

Publicly Accessible Penn Dissertations

Carbon nanopipettes (CNPs) consist of a pulled-quartz micropipette with a thin layer of amorphous carbon deposited along its entire interior surface via chemical vapor deposition. The micropipette maintains a continuous fluidic pathway from its nanoscopic tip to its distal macroscopic end, while the insulated carbon film provides an electrical path to the tip that can be used as a working electrode. The quartz at the tip of the CNP can be chemically etched to expose a desired length of a carbon pipe to control the size and characteristics of the electrode. CNPs are inexpensive, batch- fabricated, and can be made ...