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Filtering by: Creator Ostermann, Stacey D. Remove constraint Creator: Ostermann, Stacey D. Academic Affiliation Chemical, Biological and Environmental Engineering Remove constraint Academic Affiliation: Chemical, Biological and Environmental Engineering Degree Level Master's Remove constraint Degree Level: Master's

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An in silico Approach to Determine the Influence of Surface Chemical Properties on the Toxicity of Engineered Zinc Oxide Nanoparticles

Creator:

Zhou, Zitao

Abstract:

Nanotechnology products have long since made their way to markets around the world increasing the concerns about whether nanomaterials pose a risk to our environment or health. It has been suggested that engineered nanomaterial (ENM) with broad applications and rapid commercialization need better risk assessment and regulation. However, the refinement...

Resource Type:

Masters Thesis

Full Text:

Toxicity of Engineered Zinc Oxide Nanoparticles. Abstract approved: Stacey L. Harper Nanotechnology
Method development for characterizing the hydrophobicity of engineered nanoparticles

Creator:

Lee, Fang Yu

Abstract:

Characterizing the hydrophobicity of nanoparticles can help us understand their fate and transport in the environment, as well as how nanoparticles may interact with biological systems. However, contact angle and partition coefficient have limitations in measuring the hydrophobicity of nanoparticles, thus promising methods to measuring the hydrophobicity of nanoparticles are...

Resource Type:

Masters Thesis

Full Text:

Stacey L. Harper Characterizing the hydrophobicity of nanoparticles can help us understand their
Studies on effect of stabilizers, chelators and inherent periodicity on nanoparticle antioxidant activity

Creator:

Zhou, Zheng

Abstract:

The level of reactive oxygen species (ROS) is tightly regulated in biological systems as overproduction can lead to oxidative stress and result in a number of diseases. Due to its negative effects, antioxidants are studied and used against ROS in medicine, pharmaceuticals and therapeutics. Because of issues with the uptake...

Resource Type:

Masters Thesis

Full Text:

Abstract approved: ______________________________________________________ Stacey L. Harper The
Development of traceable metal oxide nanoparticles for examining environmental fate and transport

Creator:

Rowbotham, Brian

Abstract:

The fate and transport of engineered nanoparticles (ENPs) such as titanium dioxide (TiO₂) are of concern due to their increasing use in consumer products. Although analytical methods for detection and quantification of ENPs in environmental matrices are being developed, these methods are difficult, time consuming, and not easily validated for...

Resource Type:

Masters Thesis

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treatment, an d the ability of labeled particles to be detected against background titanium concentrations
The effects of engineered coatings and natural organic matter on nanoparticle aggregation

Creator:

McDowell, Shannon A.

Abstract:

In order to better predict the aggregation state of nanomaterials, the factors that influence aggregation must be understood. The combined effects of natural and engineered coatings have been shown to factor into nanoparticle aggregation behavior in preliminary research. In this study, aggregation behaviors of gold nanoparticles with two different engineered...

Resource Type:

Masters Thesis

Full Text:

. Aggregation of cit-AuNPs in the presence of NOM isolates and KCl. (a-d) TR-DLS profiles of cit-AuNPs in 1
Development and applications of a high-throughput activity assay, using the ammonia-oxidizing bacteria Nitrosomonas europaea

Creator:

Bartow, Shannon M.

Abstract:

The rising demand on freshwater resources emphasizes the benefit of biogeochemical processes that maintain clean water by removing pollutants such as excess nitrogen. The most sensitive step in the removal of nitrogen from waterways is the oxidation of ammonia, a part of nitrification, which is carried out by ammonia oxidizing...

Resource Type:

Masters Thesis

Full Text:

nitrogen under section 303(d) of the Clean Water Act (EPA 1993). Jurisdictions with waters that exceed
Heteroaggregation between citrate-stabilized gold nanoparticles and hematite colloids : mechanisms and quantification of nanoparticle-colloid interactions

Creator:

Smith, Brian M.

Abstract:

Understanding the aggregation behavior of engineered nanomaterials (ENMs) in aqueous environments is essential to understanding their fate, transport, and toxicity. Because naturally occurring colloids will likely be present at much higher concentrations than ENMs in environmental systems, heteroaggregation and attachment with these natural colloids could significantly influence ENM fate and...

Resource Type:

Masters Thesis

Full Text:

of laboratory resources by Dr. Stacey Harper and Dr. Christine Kelly. Conversations with Ed
Interactions between natural organic matter and gold nanoparticles stabilized with different organic capping agents

Creator:

Stankus, Dylan Paul

Abstract:

The adsorption of natural organic matter (NOM) to the surfaces of natural colloids and engineered nanoparticles is known to strongly influence, and in some cases control, their surface properties and aggregation behavior. As a result, the understanding of nanoparticle fate, transport and toxicity in natural systems must include a fundamental...

Resource Type:

Masters Thesis

Full Text:

diffuse layer (d) is comprised of free ions which move in the fluid under the influence of electric
Spherical Au Nanoparticle Interaction with Lipid Monolayers Probed with Sum Frequency Generation Spectroscopy

Creator:

Faase, Ryan A.

Abstract:

Nanoparticles have become more prevalent from their use in sunscreen to antimicrobial agents in socks. In light of these applications, gaining a fundamental understanding of how NPs interact with humans is crucial for their future. Specifically, how cells interact with NPs and what factors drive the modes of cellular uptake....

Resource Type:

Masters Thesis

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were collected between 1950 and 2150 cm-1 looking at C-D vibrational modes, while the non-deuterated
Effects of silver ions and nanoparticles on suspended cells and biofilms of Nitrosomonas europaea

Creator:

Barker, Leila Kelly

Abstract:

Silver nanoparticles are increasingly being incorporated into consumer products due to their broad-spectrum antimicrobial properties. The resulting influx of silver nanoparticles into wastewater may pose a threat to bacteria involved in biological wastewater treatment. Ammonia-oxidizing bacteria, which convert ammonia to nitrite in the first step of nitrification, are highly sensitive...

Resource Type:

Masters Thesis

Full Text:

their lab space and helped with fluorescence microscopy. Thanks to the Stacey Harper lab for use of

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Academic Affiliation

Chemical, Biological and Environmental Engineering[remove]13

Advisor

Harper, Stacey L.3
Semprini, Lewis3
Nason, Jeffrey2
Nason, Jeffrey A.2
Baio, Joe E.1
more Advisors »

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 2011 to 2020

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Committee Member

Harper, Stacey5
Radniecki, Tyler3
Higgins, Adam2
Semprini, Lewis2
Arnadottir, Liney1
more Committee Members »

Creator

Barker, Leila Kelly1
Bartow, Shannon M.1
Faase, Ryan A.1
Lee, Fang Yu1
Mcdowell, Shannon A.1
more Creators »

Contributor

Angstrom, Arek M.1
Baio, Joe E.1
Chang, Chih Hung1
Harper, Stacey L.1
Mackiewicz, Marilyn R.1
more Contributors »

Date

Date range begin – Date range end

Current results range from 2010 to 2020

View distribution

Decade

2020-20291
2010-201912

Degree Field

Chemical Engineering7
Environmental Engineering6

Degree Level

Master's[remove]13

Degree Name

Master of Science (M.S.)13

Language

English [eng]13

License

All rights reserved13

Non-Academic Affiliation

Oregon State University. Graduate School11

Peer Reviewed

No13

Resource Type

Masters Thesis13

Rights Statement

In Copyright13

Subject

Nanoparticles -- Environmental aspects4
Nanoparticles3
Aggregation (Chemistry)2
Nanoparticles -- Toxicology2
Nitrosomonas2
more Subjects »

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