X-Ray Photoelectron Spectroscopy with electrical modulation can be used to probe electrical properties of liquids and their interfaces at different stages.

07:00 EST 3rd December 2019 | BioPortfolio

Summary of "X-Ray Photoelectron Spectroscopy with electrical modulation can be used to probe electrical properties of liquids and their interfaces at different stages."

Operando X-Ray Photoelectron spectroscopy (o-XPS) has been used to record the binding energy shifts in C1s peak of a pristine poly-ethylene glycol (PEG) liquid drop in an electrowetting on dielectric (EWOD) geometry, and after exposing it to several high-voltage breakdown processes. This was achieved by recording XPS data while the samples were subjected to 10 V DC and AC (square-wave modulation) actuations to extract electrical information related with the liquid and its interface with the dielectric. Through analysis of the XPS data under AC actuation a critical frequency of 170 Hz is extracted for the pristine PEG, which is translated to a resistance value of 14 MOhm for the liquid and a capacitance value of 60 pF for the dielectric, by help of simulations using an equivalent circuit model, and also by XPS analyses of a mimicking device, under similar conditions. The same measurements yield an increased value of 23 MOhm for the resistance of the liquid after the breakdown, by assuming the capacitance of the dielectric stays constant. In addition, an asymmetry in polarity dependence is observed with respect to both the onset of the breakdown voltage, and also the leakage behavior of the deteriorated (PEG + dielectric) system, such that deviations are more pronounced at positive voltages. Both DC and AC behaviors of the post-breakdown system can also be simulated, but only by introducing an additional element, a diode or a polarity and magnitude dependent voltage source (VCVS), which might be attributed to negative charge accumulation at the interface. Measurements for a liquid mixture of PEG with 8 % ionic liquid, yields almost two orders of magnitude smaller resistance for the drop, due to the enhanced conductivity by the ions. Coupled with modelling, XPS measurements under DC and AC modulations enable probing unique electrochemical properties of liquid/solid interfaces.


Journal Details

This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827


DeepDyve research library

PubMed Articles [8222 Associated PubMed Articles listed on BioPortfolio]

High Thermoelectric Performance of Bi0.46Sb1.54Te3-SnTe: Synergistic Modulation of Electrical and Thermal Transports by the Introduction of Thermoelectric Hetero Nano Region.

Thermoelectric hetero nano region, as a new strategy, can effectively modulate the electrical and thermal transport properties. In this study, thermoelectric hetero nano region is explored to improve ...

Commercial silk-based electronic yarns fabricated using microwave irradiation.

Electronic textiles (e-textiles) are being developed because of their potential applications in wearable and flexible electronics. However, complex procedures and chemical agents are required to synth...

Quantitative detection and evaluation of thrombus formation based on electrical impedance spectroscopy.

Thrombus formation is quantitatively measured and evaluated by the electrical impedance spectroscopy method in this study, which confirms the possibility for the application of a promising non-invasiv...

Lab on a Tip: Applications of Functional Atomic Force Microscopy for the Study of Electrical Properties in Biology.

Electrical properties, such as charge propagation, dielectrics, surface potentials, conductivity, and piezoelectricity, play crucial roles in biomolecules, biomembranes, cells, tissues, and other biol...

Evidence of reverse electrical remodelling by non-invasive electrocardiographic imaging to assess acute and chronic changes in bulk ventricular activation following cardiac resynchronisation therapy.

Cardiac resynchronisation therapy (CRT) corrects electrical dyssynchrony. However, the temporal changes in the electrical timing according to substrate are unclear. We used electrocardiographic imagin...

Clinical Trials [3339 Associated Clinical Trials listed on BioPortfolio]

Effects of Cerebral and Peripheral Electrical Stimulation on Conditioned Pain Modulation in Healthy Subjects.

The Neuromatrix pain model and new findings on pain chronification process point to a greater efficacy of treatments that address central and peripheral rather than only peripheral structu...

The Effect of Frequency Modulation in TENS on Habituation and Pain Threshold

Purpose The purpose of this study is to determine whether application of Transcutaneous Electrical Nerve Stimulation (TENS) is effective on habituation to electrical current whether deliv...

AVAZZIA Electrical Stimulation

A clinical study at the Baylor College of Medicine, Division of Vascular Surgery and Endovascular Therapy, is being proposed to test the efficacy of a novel electrical stimulation platform...

Impedance Spectroscopy in Esophageal Cancer

Detection of early esophageal cancer in surrounding normal tissue can be challenging even for experienced examiners. The early detection is essential to determine the following treatment. ...

Transcutaneous Diaphragm Electrical Stimulation in Critically Ill Patients

This study evaluates the effect of a transcutaneous electrical stimulation in critically ill patients compared to a sham electrical stimulation to decrease the incidence of diaphragm dysfu...

Medical and Biotech [MESH] Definitions

Apparatus and instruments that generate and operate with ELECTRICITY, and their electrical components.

The electrical response evoked in a muscle or motor nerve by electrical or magnetic stimulation. Common methods of stimulation are by transcranial electrical and TRANSCRANIAL MAGNETIC STIMULATION. It is often used for monitoring during neurosurgery.

The electrical properties, characteristics of living organisms, and the processes of organisms or their parts that are involved in generating and responding to electrical charges.

Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.

A negative shift of the cortical electrical potentials that increases over time. It is associated with an anticipated response to an expected stimulus and is an electrical event indicative of a state of readiness or expectancy.

Quick Search

DeepDyve research library

Relevant Topic

Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...

Searches Linking to this Article