A5030530103- Nanoparticles: synthesis and applications
- Heavy metals in environment
- Analytical chemistry methods development
- Recycling and Waste Management Techniques
- Field-Flow Fractionation Techniques
- Microplastics and Plastic Pollution
- Graphene and Nanomaterials Applications
- Electrochemical Analysis and Applications
- Geochemistry and Geologic Mapping
- Ion-surface interactions and analysis
- Nanotechnology research and applications
- Mercury impact and mitigation studies
- Gas Sensing Nanomaterials and Sensors
- Dental Erosion and Treatment
- Pharmaceutical and Antibiotic Environmental Impacts
- Air Quality and Health Impacts
- Electrostatics and Colloid Interactions
- Transition Metal Oxide Nanomaterials
- Advanced Nanomaterials in Catalysis
- nanoparticles nucleation surface interactions
- Conducting polymers and applications
- Metal Extraction and Bioleaching
- Carbon Nanotubes in Composites
- Water Quality and Pollution Assessment
- Polymer Science and PVC
Western Washington University
2019-2025
University of Córdoba
2022
University of Vienna
2022
Duke University
2016-2020
Bellingham Technical College
2019
Colorado School of Mines
2013-2016
Durham Technical Community College
2016
The utilization of microsecond dwell times allows for the detection multiple elements within a single particle.
Environmental context The detection and characterisation of engineered nanomaterials in the environment is essential for exposure risk assessment this emerging class materials. However, ubiquitous presence naturally occurring presents a unique challenge accurate determination environmental matrices. New techniques methodologies are being developed to overcome some these issues by taking advantage subtle differences elemental isotopic ratios within nanomaterials. Abstract increasing...
This tutorial review focuses on aqueous slurries of dispersed engineered nanoparticles (ENPs) used in chemical mechanical planarization (CMP) for polishing wafers during manufacturing semiconductors.
A recreational water system was monitored for release of both mineral and organic sunscreen constituents the first time.
The rapid development of nanotechnology has led to concerns over their environmental risk. Current analytical techniques are underdeveloped and lack the sensitivity specificity characterize these materials in complex biological matrices. To this end, single particle ICP-MS (spICP-MS) been developed past decade, with capability detect nanomaterials at environmentally relevant concentrations However, some composed elements inherently difficult quantify by quadrupole due abundant molecular...
Nanogeochemistry is an emerging focus area recognizing the role of nanoparticles in Earth systems. Engineered nanotechnology has cultivated advanced analytical techniques that are also applicable to nanogeochemistry. Single particle inductively coupled plasma ICP-time-of-flight-mass spectrometry (ICP-TOF-MS) promises a significant step forward, as time-of-flight mass analyzers enable simultaneous quantification entire atomic spectrum (∼7-250 m/z+). To demonstrate utility this approach,...
The development and application of engineered nanomaterials has required pushing the boundaries analytical instrumentation in order to detect, quantify characterize properties behaviors materials at the...
A methodology has been developed to measure nanoparticle mass and density, by combining centrifugal field-flow fractionation (CeFFF; more commonly called sedimentation FFF or SdFFF) transmission electron microscopy (TEM). Particle effective obtained from CeFFF retention data particle size the TEM images were used calculate density. The method was initially applied density of monodispersed polystyrene latex nanoparticles. Measured densities for nanoparticles 160–300 nm in diameter range...
The recent expansion in the use of nanomaterials consumer and industrial applications has led to a growing concern over their behavior, fate, impacts environmental systems. However, engineered nanoparticles comprise only small fraction total nanoparticle mass aquatic Human activities, particularly urban watersheds, are increasing population incidental likely altering cycling more abundant natural nanoparticles. Accurate detection, quantification, characterization, tracking these different...
Current approaches provide a view of natural nanomaterials while emerging technologies open the door to further studies nanogeoscience.
A key aspect in the safety testing of metal nanoparticles (NPs) is measurement their dissolution and true particle uptake organisms. Here, based on tendency Ag-NP to dissolve Au-NP be inert environment, we exposed earthworm Eisenia fetida Au core-Ag shell NPs (Au@Ag-NPs, Ag-NPs with a core) both single combined exposures non-coated Au-NPs, Ag-NPs, Ag+ Au+ ions natural soil. Our hypothesis was that Ag would partially or completely from Au@Ag-NPs core thereby behave as tracer particulate...
Nanoparticles (NPs) and their colloidal aggregates are ubiquitous play important roles in the transport release of metals. Knowledge dissolution rates aggregation behavior solution crucial for better prediction fate biogeochemical cycling, ecotoxicity, environmental remediation. There however significant technical challenges to accurately obtain such information as a result heterogeneity highly dynamic transformation exhibited by NPs, particularly at relatively low particle concentrations...
The development of engineered nanotechnology has necessitated a commensurate maturation nanoanalysis capabilities. Building off legacy established by electron microscopy and light-scattering, environmental now benefited from ongoing advancements in instrumentation data analysis, which enable deeper understanding nanomaterial properties, behavior, impacts. Where once nanoparticles colloids were grouped into broad 'dissolved or particulate' classes that are dependent on filter size cut-off,...
The continued growth of the nanotechnology industry and incorporation nanomaterials into consumer applications will inevitably lead to their release environmental systems. Single-walled carbon nanotubes (SWCNTs) in particular have exhibited many attractive optical, mechanical, electrical properties that lend themselves new exciting applications. Assessing impact upon environment is contingent quantifying characterizing SWCNTs matrixes. In this study, were isolated from estuarine sediments...
Plastics have long been an environmental contaminant of concern as both large-scale plastic debris and micro- nano-plastics with demonstrated wide-scale ubiquity. Research in the past decade has focused on potential toxicological risks posed by microplastics, well their unique fate transport brought colloidal nature. These efforts slowed lack analytical techniques sufficient sensitivity selectivity to adequately detect characterize these contaminants biological matrices. To improve analyses,...
Environmental context Carbon nanotubes are added to polymers such as polycarbonate and epoxy form nanocomposites with enhanced material properties. factors including temperature, UV light exposure pH have the potential degrade these composites increase release of toxic polymer-associated chemicals. This study investigates how carbon nanotube loading decreases known endocrine-disrupting compounds, bisphenol A 4-tert-butylphenol, from polymer under simulated weathering environments. Abstract...