David Durkin

David Durkin
United States Naval Academy | USNA · Department of Chemistry

About

67
Publications
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730
Citations

Publications

Publications (67)
Article
This work investigates the swelling and physical properties of additively manufactured (AM) acrylate and traditionally manufactured (TM) O-rings when exposed to gasoline and organic mixtures. Fuel chemical compositions were determined using gas chromatography/mass spectrometry. Polymer properties were found using differential scanning calorimetry,...
Article
Natural Fiber Welding The anchor is printed on cellulose paper using ionic liquid ink containing silver nanoparticle laden lignocellulose. The study in article number 2100872 by David P. Durkin and co‐workers shows how natural fiber welding can transform functional powders into anti‐microbial and anti‐biofilm textiles, which may be considered for p...
Article
Solar-driven photocatalytic generation of H2O2 over metal-free catalysts is a sustainable approach for value-added chemical production. Here, we synthesized chlorine-doped graphitic carbon nitride (Cl-doped g-C3N4) through a solvothermal method to effectively produce H2O2 with a rate of 1.19 ± 0.06 µM min⁻¹ under visible light irradiation, which wa...
Article
In this study, imidazolium-based polymerizable ionic liquids (Poly-ILs) are used to prepare novel polyionic biocomposites through Natural Fiber Welding. Two new Poly-ILs containing a 1-alkyl-3-vinylimidazolium cation and an alkylphosphonate anion were synthesized and evaluated for their ability to (i) solubilize a biopolymer (cellulose) matrix and...
Article
Biopolymer materials that use silver to imbue antimicrobial properties are finding broad application in areas such as packaging, textiles, and building materials. Conventional methods to incorporate silver can damage the supporting biopolymer matrix and/or result in large‐sized silver nanoparticles (Ag NPs) with poor antimicrobial efficacy. To miti...
Preprint
Full-text available
All-cellulose xerogel composites were fabricated using a facile, scalable three-step process-(1) partial ionic liquid dissolution, (2) non-solvent rinsing, and (3) drying. The xerogel composites are composed of two phases where the yarn center is non-porous highly crystalline cellulose I surrounded by mesoporous amorphous regenerated cellulose. The...
Article
All-cellulose xerogel composites were fabricated using a facile, scalable three-step process—(1) partial ionic liquid dissolution, (2) non-solvent rinsing, and (3) drying. The xerogel composites are composed of two phases where the yarn center is non-porous highly crystalline cellulose I surrounded by mesoporous amorphous regenerated cellulose. The...
Conference Paper
New additive manufacturing technology such as powder bed fusion must be tested rigorously to determine the chemical and mechanical properties of the resultant components. This study is focused on the characterization of Nylon-12 fabricated by selective laser sintering (SLS) as performed by the FormLabs Fuse 1 printer. It was found that the ultimate...
Conference Paper
3D printing techniques are utilized throughout the US military for their ability to rapidly and efficiently produce critical components onsite. Additionally, the use of lasers, for directed energy as well as in optical communications applications has become an ever more prevalent force multiplier. In the event of degraded or lost optical components...
Article
Full-text available
The significant diamagnetism of pyrolytic graphite (PyG) allows it to be passively levitated above permanent magnet arrays and translated in the plane of these arrays via optical radiation, which promotes applications in frictionless milli-scale robotics. Previous explanations for the translation effect have cited photothermal heating of levitated...
Article
We prepared a single-atom Fe catalyst supported on an oxygen-doped, nitrogen-rich carbon support (SAFe-OCN) for degrading a broad spectrum of contaminants of emerging concern (CECs) by activating peroxides such as peroxymonosulfate (PMS). In the SAFe-OCN/PMS system, most selected CECs were amenable to degradation and high-valent Fe species were pre...
Article
Airborne transmission of SARS-CoV-2 plays a critical role in spreading COVID-19. To protect public health, we designed and fabricated electrospun nanofibrous air filters that hold promise for applications in personal protective equipment (PPE) and the indoor environment. Due to ultrafine nanofibers (∼300 nm), the electrospun air filters had a much...
Article
Full-text available
The decrease in crystallinity of a cotton thread upon exposure to the ionic liquid 1-ethyl-3-methylimidazolium acetate is investigated via two-dimensional Raman spectral mapping of the thread cross-section. By monitoring an intrinsic cellulose I Raman mode, the transition from highly crystalline cellulose I to amorphous cellulose is monitored as a...
Preprint
Full-text available
Airborne transmission of SARS-CoV-2 plays a critical role in spreading COVID-19. To protect public health, we designed and fabricated electrospun nanofibrous air filters that hold promise for applications in personal protective equipment and indoor environment. Due to ultrafine nanofibers (~300 nm), the electrospun air filters had a much smaller po...
Article
Photocatalysis holds promise for inactivating environmental pathogens. Visible-light-responsive composites of carbon-doped graphitic carbon nitride and chitosan with high reactivity and processability were fabricated, and they can control pathogenic biofilms for environmental, food, biomedical, and building applications. The broad-spectrum biofilm...
Article
Carbon nanotubes (CNTs) have unique physical and chemical properties that drive their use in a variety of commercial and industrial applications. CNTs are commonly oxidized prior to their use to enhance dispersion in polar solvents by deliberately grafting oxygen-containing functional groups onto CNT surfaces. In addition, CNT surface oxides can be...
Article
Natural Fiber Welding (NFW) is a green engineering process that uses Ionic Liquids (IL) to prepare functional biocomposites for applications including water purification, energy storage, sensing, and thermal enhancement. The composition of the welding solution can significantly impact welding efficiency as well as the structure and composition of f...
Chapter
Ionic liquid-based (IL-based) manufacturing has the potential to revolutionize the materials industry and disrupt overdependence on petroleum-based plastics. Nature provides amazing materials at large scale; however, scalable techniques to mold and shape biomaterials have not existed at scale. Natural Fiber Welding, Inc. (NFW) has developed commerc...
Article
Heat capacity and heat of vaporization are thermal properties that affect the combustion of fuels in engines. This study highlights new calorimetric methods to measure the thermal properties of JP-5 and surrogate fuel systems. First, the heat capacity of military jet fuel (JP-5) and surrogate fuel mixtures were measured using a standalone different...
Article
Full-text available
In this study we report the synthesis and characterization of superparamagnetic Fe-Pd (1–75 at.% Fe) nanomagnets grown within a lignocellulose fiber matrix for future advanced material applications. The small (~5 nm diameter) Fe-Pd nanoparticles are crystalline with spherical shape and evenly dispersed throughout the lignocellulose support while pr...
Article
This study reveals how natural fiber welding (NFW) can be used to engineer biopolymer materials with improved thermal stability. First, it is shown how NFW without binders improves lignocellulose yarn thermal stability by ≈17 °C, primarily by condensing microfibril structure. Next, silanized‐cellulose nanofibrils (Si‐CNFs) are developed as NFW bind...
Article
Commercially available lumber, pressure-treated with micronized copper azole (MCA), has largely replaced other inorganic biocides for residential wood treatment in the USA, yet little is known about how different outdoor environmental conditions impact the release of ionic, nano-scale, or larger (micron-scale) copper from this product. Therefore, w...
Article
Full-text available
In this study, we evaluated the molar conductivity and dynamic viscosity of 1-ethyl-3-methylimidazolium acetate based solvent systems containing dissolved cellulose (cotton or microcrystalline cellulose), cellobiose, or glucose. Matrix variables included solute concentration, as well as concentration of acetonitrile or water (typical molecular spec...
Article
We provide an efficient, sustainable, low-cost, and potentially scalable method to prepare N-functionalized activated carbon (AC) for Pd-based catalysis with improved performance for water purification. N-functionalized AC supports were realized via ‘soft nitriding’, i.e., low temperature heating of a urea-AC mixture, and Pd nanoparticles with a si...
Article
For nanocellulose to function effectively as a nanofiller in polymers, its interfacial properties are often modified to enhance the dispersion of nanocellulose in the polymer matrix. However, the effect of different surface modification strategies on the persistence of nanocellulose in the environment is unclear. In this study, we have examined the...
Article
Novel Pd-based catalysts (i.e., Pd and Pd-Cu) supported on graphitic carbon nitride (g-C3N4) were prepared for nitrite and nitrate hydrogenation. The catalysts prepared by ethylene glycol reduction exhibited ultrafine Pd and Pd-Cu nanoparticles (~ 2 nm), and they showed high reactivity, high selectivity toward nitrogen gas over byproduct ammonium,...
Article
In the present work, we have studied the flame-retardant properties of phosphorus-functionalized multi-walled carbon nanotubes (MWCNTs) created by treating oxidized MWCNTs (O-MWCNTs) with phosphoric acid. These phosphorus MWCNTs (P-MWCNTs), along with pristine MWCNTs and O-MWCNTs, were incorporated into polystyrene (PS) and poly (methyl methacrylat...
Article
Graphitic carbon nitride (g-C3N4) has recently emerged as a promising visible-light-responsive polymeric photocatalyst; however, a molecular-level understanding of material properties and its application for water purification were underexplored. In this study, we rationally designed non-metal doped, supramolecule-based g-C3N4 with improved surface...
Article
Understanding the combined effect of applied tension and polymer mobilization is vital both for controlling sample contraction during “natural-fiber welding” (NFW) experiments as well as for designing scaled-up NFW processes that rely upon tension for pulling yarn and cloth stocks through a continuous treatment apparatus. A preliminary set of tests...
Article
In our study, linen and bamboo yarns were fabricated via Natural Fiber Welding (NFW) into a robust, free-standing, sustainable catalyst for water treatment. First, a series of powder catalysts were created by loading monometallic palladium (Pd) and bimetallic palladium-copper (Pd-Cu) nanoparticles onto ball-milled yarn powders via incipient wetness...
Article
We report a facile synthesis method for carbon nanofiber (CNF) supported Pd catalysts via one-pot electrospinning and their application for nitrite hydrogenation. A mixture of Pd acetylacetonate [Pd(acac)2], polyacrylonitrile (PAN), and non-functionalized multi-walled carbon nanotubes (MWCNTs) was electrospun and thermally treated to produce Pd/CNF...
Article
In article number 1401286, Paul C. Trulove, Yury Gogotsi, Genevieve Dion, and co-workers report the fabrication of electrode yarns using a process called natural fiber welding. The process uses ionic liquids to embed capacitive carbon particles into the surface of cellulose yarns. The electrode yarns are then assembled into a striped knitted fabric...
Article
Natural fiber welded (NFW) yarns embedded with porous carbon ­materials are described for applications as electrodes in textile electrochemical capacitors. With this fabrication technique, many kinds of carbons can be embedded into cellulose based yarns and subsequently knitted into full ­fabrics on industrial knitting machines. Yarns welded with c...
Article
In this work, all-natural textile composites were prepared from commercially available linen yarns and chitin. An ionic liquid (IL), 1-ethyl-3-methyl-imidazolium acetate, was used to dissolve chitin, a natural biopolymer found in the exoskeletons of crustaceans and insects. Chitin was incorporated into linen yarns via IL assisted natural fiber weld...
Article
This report presents a novel ionic liquid-based method for fabricating flexible double layer supercapacitor electrodes utilizing natural substrates. It investigates the performance of these yarns knitted as fabrics and with other cellulose-based fibers welded with carbon particles. Scanning electron microscopy, mechanical properties testing, conduc...
Article
The concept of dual opposite injection in capillary electrophoresis (DOI-CE) for the simultaneous separation, under conditions of suppressed electroosmotic flow, of anionic and cationic compounds with no bias in resolution and analysis time, is extended to a higher pH range in a zone electrophoresis mode (DOI-CZE). A new DOI-CE separation mode base...
Article
The use of capillary electrophoresis (CE) as an alternative to existing methods of quantitation of carbon monoxide (CO) in hemoglobin from postmortem blood samples is presented. The isolation of heme (the portion of the hemoglobin molecule in which CO binding takes place) from hemoglobin is described. Reduced (containing no gas molecules) heme and...
Article
This project demonstrates the use of capillary electrophoresis as an improvement to existing methods of analysis for carbon monoxide (CO) in human hemoglobin (Hb). Current methods for CO analysis are CO-oximetry and tonometry/gas chromatography, which involve lengthy sample manipulation followed by spectroscopic or gas displacement measurements. Th...

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