A5058186030- Microfluidic and Capillary Electrophoresis Applications
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- Microfluidic and Bio-sensing Technologies
- Advanced biosensing and bioanalysis techniques
- Electrowetting and Microfluidic Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Nanopore and Nanochannel Transport Studies
- Electrochemical sensors and biosensors
- Electrostatics and Colloid Interactions
- Plasmonic and Surface Plasmon Research
- Supercapacitor Materials and Fabrication
- Biosensors and Analytical Detection
- Electrohydrodynamics and Fluid Dynamics
- Engineering Education and Pedagogy
- Ionic liquids properties and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Chemical Sensor Technologies
- 3D Printing in Biomedical Research
- Conducting polymers and applications
- Near-Field Optical Microscopy
- ZnO doping and properties
- Nanofabrication and Lithography Techniques
- Spectroscopy and Quantum Chemical Studies
- Per- and polyfluoroalkyl substances research
New Jersey Institute of Technology
2016-2025
University of Missouri
2013-2016
University of Notre Dame
2007-2011
The growing global concerns to public health from human exposure perfluorooctanesulfonate (PFOS) require rapid, sensitive, in situ detection where current, state-of-the-art techniques are yet adequately meet sensitivity standards of the real world. This work presents, for first time, a synergistic approach targeted affinity-based capture PFOS using porous sorbent probe that enhances by embedding it on microfluidic platform. novel sorbent-containing platform functions as an electrochemical...
Exploiting the functionalization chemistry of graphene, long-range electrostatic and short-range covalent interactions were harnessed to produce multifunctional energetic materials through hierarchical self-assembly nanoscale oxidizer fuel into highly reactive macrostructures. Specifically, we report a methodology for directing Al Bi2O3 nanoparticles on functionalized graphene sheets (FGS) leading formation nanocomposite structures in colloidal suspension phase that ultimately condense...
One approach to reduce increasing concentrations of toxic per- and polyfluoroalkyl substances (PFAS) involves the capture PFAS from aqueous media using porous materials. The use highly porous, tunable metal organic framework (MOF) materials is appealing for targeted liquid phase sorption. In this work, we demonstrate excellent perfluorooctanesulfonate (PFOS) both chromium iron analogs MIL-101 framework. Experimental characterization PFOS uptake reveals unique differences in sorption...
Electric induced dipoles of nanocolloids the size Debye length are shown to be one order stronger than predicted by classical Maxwell-Wagner theory and its extensions. The difference is attributed normal ion migration within diffuse layer, adsorption onto Stern layer at poles. characteristic relaxation frequency (the crossover for dielectrophoresis) inversely proportional RC time capacitance resistance, has an anomalous -1 scaling with respect product particle size.
Other than concentrating the target molecules at sensor location, we demonstrate two distinct new advantages of an open-flow impedance-sensing platform for DNA hybridization on carbon nanotube (CNT) surface in presence a high-frequency AC electric field. The shear-enhanced and ion transport rate to CNT decouples parasitic double-layer impedance signal from charge-transfer due hybridization. flow field high frequency also amplifies across hybridized provides discrimination between targeted...
Molecular dielectrophoresis (DEP) is employed to rapidly (<ms) trap ssDNA molecules in a flowing solution cusp-shaped nanocolloid assembly on chip with locally amplified AC electric field gradient. By tuning frequency and DNA DEP mobility relative its electrophoretic due electrostatic repulsion from like-charged nanocolloids, mismatch-specific binding of at the cusp achieved by converging flow, concentration factor about 6 orders magnitude higher than bulk, thus allowing fluorescent...
Abstract Rhenium disulfide (ReS 2 ) differs fundamentally from other group‐VI transition metal dichalcogenides (TMDs) due to its low structural symmetry, which results in optical and electrical anisotropy. Although vertical growth is observed some TMDs under special conditions, ReS very different that it highly spontaneous substrate‐independent. In this study, the mechanism underpins thermodynamically favorable mode of uncovered. It found governing for involves two distinct stages. first...
Super-resolution imaging has been advantageous in studying biological and chemical systems, but the required equipment platforms are expensive unable to observe single-molecules at high (μM) fluorophore concentrations study protein interaction enzymatic activity. Here, a plasmonic platform was designed that utilized an inexpensively fabricated grating combination with scalable glancing angle deposition (GLAD) technique using physical vapor deposition. The GLAD creates abundance of...
Dielectrophoretic nanocolloid assay is a promising technique for sensitive molecular detection and identification, as target molecule hybridization onto the probe-functionalized nanocolloids can change their surface conductance consequently dielectrophoretic crossover frequencies. Thus, instead of relying on charge density increase after hybridization, in many capacitive field effect transistor impedance sensing techniques, current utilizes much larger (and dielectrophoresis frequency)...
Integrating transducer/sensing materials into microfluidic platforms has enhanced gas sensors′ sensitivity, selectivity, and response time while facilitating miniaturization. In this manuscript, microfluidics been integrated with non-planar microelectrode array functionalized ionic liquids (ILs) to develop a novel miniaturized electrochemical sensor architecture. The employs the IL 1-ethyl-3-methylimidazolium 2-cyanopyrolide ([EMIM][2-CNpyr]) as electrolyte capture molecule for detecting...
Ionic liquids (ILs) are being widely investigated as advanced electrolytes within electric double-layer capacitors (EDLCs) due to their inherent ionic conductivity, wide electrochemical windows, essentially zero volatility, and high temperature stability. Despite composed entirely of ions, the conductivity a typical IL is significantly hindered by its viscosity, rendering it akin normal electrolytes. In this light, in order increase applicability electrolytes, utmost priority discover...
Nanocomposites (NCs) have demonstrated promising potential in water remediation, and their catalytic role degrading hazardous contaminants has been widely explored. In this study, binary NCs of gold cuprous oxide (Au–Cu2O) were fabricated using a green protocol Saccharum officinarum L. bagasse (SOLB) extract as reducing stabilizing agent to generate nanoparticles (NPs). The biomediated Au–Cu2O NC formation was validated by various studies utilized for degradation antibiotics samples....
Normal and tangential surface ionic currents around low-permittivity nanocolloids with charges are shown to produce three different conductive mechanisms for ac-induced dipoles, all involving dynamic space charge accumulation at the double layerbulk interface a conductivity jump. However, distinct capacitor dimensions diffusive contributions disparate crossover frequencies which induced dipole reverses direction relative bulk field. A highly conducting collapsed diffuse layer, ion mobility,...
Electrical impedance spectroscopy (EIS) sensors, though rapid and cost-effective, often suffer from poor sensitivity. EIS sensors modified with carbon-based transducers show a higher conductance, thereby increasing the sensitivity of sensor toward biomolecules such as DNA. However, spectra are compromised by parasitic capacitance electric double layer (EDL). Here, new shear-enhanced, flow-through nonporous, nonplanar interdigitated microelectrode has been fabricated that shifts EDL capacitor...