Polyaniline Protonation and Deprotonation Process as the Main Mechanism for Ionic Field Effect Sensors

2015 ◽  
Vol 1795 ◽  
pp. 41-46 ◽  
Author(s):  
José Renato Alcarás ◽  
Hugo J.N.P.D. Mello ◽  
Marcelo Mulato
Keyword(s):  
Electric Potential ◽  
Field Effect ◽  
Main Mechanism ◽  
Alkaline Solutions ◽  
Electric Response ◽  
Ionic Field ◽  
Response Versus ◽  
Before And After

ABSTRACTIn this work, Polyaniline (PANI) was used as a sensing film for pH measures due to its characteristic of switching protonation states under acid and alkaline solutions. Equally produced films had their sensitivity (electric response versus pH) measured before and after being under the influence of a constant electric potential (from 3.5 to 6 V, one for each film) for the analysis on how the electric potential influenced the sensitivity. Then, the protonation caused by the application of the first potential was reversed by applying a constant 5 V reverse potential and the sensitivity was then evaluated again. The results show, on average, a constant relation between intensity of protonation and the potential applied and that the process of protonation is reversible by applying a higher opposite potential then the protonation one.

scholarly journals Indication of the Coronavirus Model Using a Nanowire Biosensor

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 50
Author(s):  
Vladimir Generalov ◽  
Olga Naumova ◽  
Dmitry Shcherbakov ◽  
Alexander Safatov ◽  
Boris Zaitsev ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Negative Charge ◽  
Positive Charge ◽  
Silicon On Insulator ◽  
Nanowire Surface ◽  
Before And After ◽  
Effect Transistor ◽  
Current Value ◽  
Silicon On Insulator Technology

The presented results indicate virus-like particles of the coronavirus (CVP) using a nanowire (NW) biosensor based on silicon-on-insulator technology. In the experiment, we used suspensions of CVP and of specific antibodies to the virus. Measurements of the current value of the field-effect transistor before and after the introduction of the CVP on the surface of the nanowire were performed. Results showed antibody + CVP complexes on the phase section with the surface of the nanowire modulate the current of the field-effect transistor; CVP has an electrically positive charge on the phase section “nanowire surface-viral suspension»; antibody + CVP complexes have an electrically negative charge on the phase section “nanowire surface-viral suspension”; the sensitivity of the biosensor is made up of 10−18 M; the time display was 200–300 s.

scholarly journals Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5819
Author(s):  
Lukas Wetterau ◽  
Claas Abert ◽  
Dieter Suess ◽  
Manfred Albrecht ◽  
Bernd Witzigmann
Keyword(s):  
Electric Potential ◽  
Giant Magnetoresistance ◽  
Spin Diffusion ◽  
Magnetic Vortex ◽  
Electric Response ◽  
Stray Field ◽  
Soft Magnetic ◽  
Micromagnetic Simulations ◽  
Gmr Sensor ◽  
Magnetization Change

We present a numerical investigation on the detection of superparamagnetic labels using a giant magnetoresistance (GMR) vortex structure. For this purpose, the Landau–Lifshitz–Gilbert equation was solved numerically applying an external z-field for the activation of the superparamagnetic label. Initially, the free layer’s magnetization change due to the stray field of the label is simulated. The electric response of the GMR sensor is calculated by applying a self-consistent spin-diffusion model to the precomputed magnetization configurations. It is shown that the soft-magnetic free layer reacts on the stray field of the label by shifting the magnetic vortex orthogonally to the shift direction of the label. As a consequence, the electric potential of the GMR sensor changes significantly for label shifts parallel or antiparallel to the pinning of the fixed layer. Depending on the label size and its distance to the sensor, the GMR sensor responds, changing the electric potential from 26.6 mV to 28.3 mV.

Dechlorination of large marine iron artifact using a novel technique involving impressed current

2015 ◽  
Vol 62 (4) ◽  
pp. 259-269
Author(s):  
Georgios Batis ◽  
Angeliki Zacharopoulou ◽  
Evgenia Zacharopoulou ◽  
Helene Siova ◽  
Vasilike Argyropoulos
Keyword(s):  
Organic Coating ◽  
Corrosion Products ◽  
Alkaline Solutions ◽  
Content Type ◽  
Conservation Treatment ◽  
Chemical Reagents ◽  
Before And After ◽  
Long Time ◽  
Electrochemical Chloride Extraction ◽  
Short Time

Purpose – This paper aims to develop an electrochemical dechlorination method for large objects in a short time, which were for a long time in the sea. Traditionally, in conservation, chlorides are extracted from marine iron artifacts using complete immersion of those objects in alkaline solutions with or without electrolysis. However, these techniques are time-consuming and very costly, especially when applied to large marine artifacts such as cannons and anchors. Design/methodology/approach – An appropriate sponge was chosen based on resistance to NaOH and the rate of exacted chlorides. Application of electrochemical dechlorination in situ and removal of chloride were measured by the scanning electron microscope (SEM)-EDAX method on the corrosion products and by titration of the electrolysis solution. X-ray diffraction (XRD) method is used for identification of corrosion products before and after application of electrochemical chloride extraction. Findings – The electrochemical chloride extraction (ECE) method is applied against the corrosion of reinforced concrete. From the authors’ research, it is obvious that ECE can successfully extract chlorides from dried large metallic objects exported from the sea. The method of ECE removes the majority of chlorides from the metal during conservation treatment so that the application of organic coating will allow the object to remain stable over a long period. Originality/value – A new methodology was developed for dechlorination of metallic objects exported from the sea in a short time and thus the consumption of chemical reagents was cut down.

Progress toward a solid-state ionic field effect transistor

2012 ◽  
Vol 111 (7) ◽  
pp. 074511 ◽  
Author(s):  
Ann M. Deml ◽  
Annette L. Bunge ◽  
Michael A. Reznikov ◽  
Alex Kolessov ◽  
Ryan P. O’Hayre
Keyword(s):  
Solid State ◽  
Solid State Ionic ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Ionic Field ◽  
Effect Transistor ◽  
State Ionic

Ionic Field Effect in Epitaxial AgBr Layers

1977 ◽  
pp. 675-684
Author(s):  
V Zhelev ◽  
J Malinowski
Keyword(s):  
Field Effect ◽  
Ionic Field

scholarly journals The active modulation of drug release by an ionic field effect transistor for an ultra-low power implantable nanofluidic system

Nanoscale ◽  
2016 ◽  
Vol 8 (44) ◽  
pp. 18718-18725 ◽  
Author(s):  
Giacomo Bruno ◽  
Giancarlo Canavese ◽  
Xuewu Liu ◽  
Carly S. Filgueira ◽  
Adriano Sacco ◽  
...  
Keyword(s):  
Drug Release ◽  
Low Power ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Ultra Low Power ◽  
Ionic Field ◽  
Effect Transistor ◽  
Nanofluidic System

scholarly journals Ionic field effect and memristive phenomena in single-point ferroelectric domain switching

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Anton V. Ievlev ◽  
Anna N. Morozovska ◽  
Eugene A. Eliseev ◽  
Vladimir Ya Shur ◽  
Sergei V. Kalinin
Keyword(s):  
Field Effect ◽  
Domain Switching ◽  
Single Point ◽  
Ferroelectric Domain ◽  
Ionic Field

scholarly journals Reactivity of Metakaolin in Alkaline Environment: Correlation of Results from Dissolution Experiments with XRD Quantifications

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2214
Author(s):  
Sebastian Scherb ◽  
Mathias Köberl ◽  
Nancy Beuntner ◽  
Karl-Christian Thienel ◽  
Jürgen Neubauer
Keyword(s):  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Systematic Investigation ◽  
Attenuated Total Reflection ◽  
Emission Spectrometry ◽  
Alkaline Solutions ◽  
X Ray ◽  
Inductively Coupled ◽  
Before And After ◽  
Congruent Dissolution

Systematic investigation of filtrates and filter residues resulting from a 24 h treatment of metakaolin in different alkaline solutions were performed. On filtered metakaolin particles, inductively coupled plasma-optical emission spectrometry (ICP-OES) measurements reveal an enrichment of iron and titanium, which suggests an inhomogeneous distribution of these cations. Since the SiO2/Al2O3 ratio remains constant in all filter residues examined, the dissolution of the Si and Al monomers is congruent. Structural differences, identified by attenuated total reflection–Fourier transform infrared spectroscopy (ATR-FTIR) as a consequence of alkali uptake, influence the X-ray scattering contribution of metakaolin, and thus quantifications with the partial or no known crystal structure (PONKCS) method. This leads to deviations between the degree of reaction calculated from Si and Al solubility from filtrate and that quantified by quantitative powder X-ray diffraction (QPXRD) using the filter residue. Nevertheless, the described changes do not cause a shift in the X-ray amorphous hump in case of congruent dissolution, and thus allow the quantification of the metakaolin before and after dissolution with the same hkl-phase model.

Field-effect studies of C60 thin films before and after implantation with potassium

1996 ◽  
Vol 81 (2-3) ◽  
pp. 259-263 ◽  
Author(s):  
P. Trouillas ◽  
B. Ratier ◽  
A. Moliton ◽  
K. Pichler ◽  
R.H. Friend
Keyword(s):  
Thin Films ◽  
Field Effect ◽  
Before And After

The Research on Hot Compression Mechanism of Light Alloy

2012 ◽  
Vol 204-208 ◽  
pp. 4079-4082
Author(s):  
Jun Wei Liu ◽  
Shi Qiang Lu ◽  
Xian Juan Dong ◽  
Xuan Xiao ◽  
Gui Fa Li
Keyword(s):  
Mechanical Property ◽  
Microstructure Evolution ◽  
Main Mechanism ◽  
Second Phase ◽  
Light Alloy ◽  
Two Stage ◽  
Second Stage ◽  
Second Phase Particles ◽  
Before And After ◽  
Compression Mechanism

In this research, in order to explore the main mechanism of direct and two-stage compression in as-cast light alloy, the mechanical property, microstructure evolution and the flowing of second phase particles were studied, before and after deformation. Then, the influence of the strain volume in first stage on flowing stress of the second stage deformation also was researched.

Sign in / Sign up

Export Citation Format

Share Document