Marwan Suleiman Mousa

Mu’tah University · Physics

The aim of this paper is to study the field electron emission of silicon dioxide coated tungsten cathode. Tungsten tips of less than 100 nm radius were prepared by electrochemical etching. The size of silicon dioxide (silica) nanoparticles ranges from 3 nm to 15 nm. Field emission studies were conducted on field emission microscope under high vacuu...

Modification of the molybdenum nano tips by coating with Resinpal 2301 Epoxy Resin. This thesis deals with a study of some electronic emission properties from tapered emitters prepared from molybdenum using specialized devices. Molybdenum has distinctive technical characteristics, which qualifies it to be a distinctive electronic source with chara...

The structural alterations that may arise in boiled and nonboiled bones are often overlooked despite their critical importance in the development of defleshing techniques across various scientific disciplines. To elucidate the microstructural characteristics of bones following the removal of soft tissue through conventional methods, attenuated tota...

The structural alterations that may arise in boiled and nonboiled bones are often overlooked despite their critical importance in the development of defleshing techniques across various scientific disciplines. To elucidate the microstructural characteristics of bones following the removal of soft tissue through conventional methods, attenuated tota...

The Murphy-Good Fowler-Nordheim equation was derived for planar and smooth conducting surfaces based on the Sommerfeld free-electron theory. It is applicable to a wide range of micro-emitters. The analyses of experimental field emission data from nano-scaled emitters showed deviation from the theoretical predictions. This has either been noticed in...

The Murphy-Good Fowler-Nordheim equation was derived for planar and smooth conducting surfaces based on the Sommerfeld free-electron theory. It is applicable to a wide range of micro-emitters. The analyses of experimental field emission data from nano-scaled emitters showed deviation from the theoretical predictions. This has either been noticed in...

Field electron emission measurements were carried out on copper of 99.95% purity emitters, with apex radii in the nano and micrometer range. Samples have been prepared by electrochemical etching using phosphoric acid (H 3 PO 4) solution. Measurements have been carried out under high vacuum environments with a base pressure of 10-7 mbar. Samples wer...

This work provides an experimental study on the effects of polyethylene coating on the field electron emission characteristics of clean (uncoated) tungsten tips. Several tungsten tips, with different apex radii, have been prepared, coated with different thicknesses of polyethylene layers and then examined using a standard field electron emission mi...

The electron energy spectra of transmitted scattered electrons from free-standing films are simulated using a Monte Carlo computational approach. Elastic scattering is simulated using Mott cross-sections and inelastic scattering via discrete processes determined from dielectric function data. This allows one to simulate the secondary electrons as w...

This paper studies and analyses the characteristics of cold field electron emission from uncoated polycrystalline tungsten tips before and after being coated with an insulating polystyrene layer of different thicknesses. The process of testing the samples has been carried out under high vacuum conditions (10 −8 mbar). Uncoated tungsten tips were pr...

This work provides an experimental study on the effects of polyethylene coating on the field electron emission characteristics of clean (uncoated) tungsten tips. Several tungsten tips, with different apex radii, have been prepared, coated with different thicknesses of polyethylene layers, and then examined in a standard field electron emission micr...

It is generally accepted that the formation of α-Al 2 O 3 scale on FeCrAl alloys is governed by inward oxygen transport along grain boundaries. However, it metal ion outward diffusion plays a role in the development of the oxide scales and their microstructural characteristics. This paper studies oxidation behavior and outward diffusion for iron-ch...

The amorphous/crystalline phase transition behavior of PEO films prepared from solution using spin casting method was studied. According to X-ray diffraction (DELTA) analysis, PEO film has a semicrystalline nature at room temperature. The amorphous to crystalline nature of PEO increases with temperature until reaching an amorphous state at 333 K. ¹...

Unterstützt von der GDCh trafen sich im Juni 2022 bereits zum neunten Mal junge Wissenschaftlerinnen und Wissenschaftler in einem arabischen Land zu einem interdisziplinären Workshop. Dieses Mal fand die Veranstaltung an der German‐Jordanian University (GJU), Madaba, Jordanien im Vorfeld des Humboldt‐Kollegs „How to Change the World via Science“ st...

U582: The best early treatment of field electron emission (FE) theory was presented by R.H. Fowler and L. (W.) Nordheim (FN) in 1928. This theory was developed as an application of quantum mechanical tunneling through an exactly triangular potential energy barrier. Although at a conceptual level this theory has been found popular and widely accepte...

Mu'tah University, Jordan Field ion emission is a technique used to study the surface structure of the field emission nano-tips after applying high external electric filed. Composite tungsten-epoxy resin nano emitters with radii about 100 nm have been used for this type of measurements. The tungsten uncoated tips were prepared using the electrochem...

Loading of the anti-cancer drug 6-gingerol on graphene, graphene oxide, and Fe3O4 nanocarriers is investigated using Monte Carlo (MC) adsorption locator simulations in the gases phase. Molecular dynamics (MD) simulations are used in aqueous medium and neutral pH for the adsorption of 6-gingerol. In this study, the 6-gingerol loading ability of grap...

The survey researched the aspects that inspire secondary school physics teachers to utilize computer technology in instruction and learning in four areas of the Hashemite Kingdom of Jordan. To assess the research question, the survey used a quantitative review research strategy utilizing a survey questionnaire comprising of 25 Likert-type scale inq...

In field electron emission (FE) studies, to interpret current-voltage data and extract characterization parameters, we use smooth planar metal-like emitter (SPME) methodology and a data-analysis plot. Three types exist: Millikan-Lauritsen (ML), Fowler-Nordheim (FN) and Murphy-Good (MG) plots. In SPME methodology, ML and FN plots are slightly curved...

In field electron emission (FE) studies, interpretation of measured current–voltage characteristics and extraction of emitter characterization parameters are usually carried out within the framework of “smooth planar metal-like emitter (SPME) methodology”, using a data-analysis plot. This methodology was originally introduced in the 1920s. Three ma...

Using the spin coating technique, polyethylene oxide (PEO)-Curcumin nanocomposite thin films have been deposited on a quartz substrate. The film thickness role on the optical properties was investigated. SEM investigated the morphology of the thin films and revealed that curcumin NPs have a spherical shape with an average size of less than 100 nm....

This work studies the impact of positioning nickel nanoparticles (Ni‐NPs) on the surface of doped (P84‐PEO) nanocomposite films by using an ultra‐uniform magnetic field as a model for positioning magnetic NPs inside a polymeric matrix. This process is used to achieve desired and adjustable optoelectronic properties and to obtain new optical and ele...

The significance of the Fowler-Nordheim-type plots lies in the possibility of extracting useful and reliable physical parameters of the field electron emitters. This is achieved by the parameter's extraction methods. We report on the application of two parameters extraction methods on field emission data from bundles of carbon fibers (CFs) grouped...

This pre-print has been superseded by the published paper entitled: "Interpretation of field emission current–voltage data: Background theory and detailed simulation testing of a user-friendly webtool".

The changes that could occur in the structure of boiled bone and non-boiled bone are not frequently considered. However, these differences are significant to establishing the defleshing process in many science fields. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) and X-Ray Diffraction (XRD) Spectroscopies were used to reveal th...

Advanced methodologies in gamma-ray spectroscopy allow for excellent background suppression and increased efficiency using composite Clover detectors with combinations of active shields. The active shield consists of multiple scintillators carefully oriented around the Ge crystals, and consist of BGO, CsI and Plastic scintillators. The events from...

Advanced methodologies in gamma-ray spectroscopy allow for excellent background suppression and increased efficiency using composite Clover detectors with combinations of active shields. The active shield consists of multiple scintillators carefully oriented around the Ge crystals, and consist of BGO, CsI and Plastic scintillators. The events from...

This thesis deals with the process of field-induced electron emission from the surfaces of metals into vacuum, before and after coating by a dielectric material. This process – induced by an intense external electrostatic field and usually called cold field electron emission (CFE) – is technically important due to its large number of application...

In field electron emission (FE) studies, the current/voltage or the macroscopic current-density/field characteristics of single tip or large area field emitters can be expressed in a nearly linear form using one of a small number of standard data-analysis plots. Usually, the chosen plot is a Fowler-Nordheim plot, a Murphy-Good plot or a Millikan-La...

Field Electron Emission from Carbon Fiber Microemitters Coated with Dielectric Epoxy Mu’tah University, 2017 This thesis deals with the process of field-induced electron emission from the surfaces of metals into vacuum, before and after coating by a dielectric material. This process -induced by an intense external electrostatic field and usually...

The aim of this study was to evaluate the influence of mineral and natural additives (2.5; 5; 10 wt.%) on the impact strength of epoxy–basalt composites. Three types of filler were used to modify the epoxy matrix: basalt powder (BP), basalt microfiber (BF) and sunflower husk ash (SA). The impact strength and the maximum force were determined for th...

After the Conference for Environment in Stockholm 1972 and the first report to the Club of Rome „Limits of the Growth“, which has been published in same year, was finally understood, that the technological progress can bring also undesired effects. As a consequence of the recognized situation, debates on a global level have started concerning poten...

Enhanced field emission properties of composite metallic cathodes, with carbon black Nanoparticles and paste carbon black Nanoparticles with Epoxy lite EPR-478.

U572: This poster introduces a user friendly webtool to test and analyze field electron emission data analysis plots. Mainly: Fowler-Nordheim, Millikan-Lauritsen and Murphy-Good plots. The webtool is available online on the link: https://fieldemissionanalysis.weebly.com/

Field electron emission theory and experiments include testing and analyzing the measured current-voltage characteristics using the so-called Fowler-Nordheim or Murphy-Good plots. Although Fowler-Nordheim plots are theoretically predicted to be slightly curved and Murphy-Good plots are predicted to be almost-exactly straight, still they provide the...

Field electron emission theory and experiments include testing and analyzing the measured current-voltage characteristics using the so-called Fowler-Nordheim or Murphy-Good plots. Although Fowler-Nordheim plots are theoretically predicted to be slightly curved and Murphy-Good plots are predicted to be almost-exactly straight, still they provide the...

This research is aimed towards more in-depth understanding of field emission properties of tungsten single tip field emitters (STFEs) coated with tens of nanometer thin barrier of selected refractory oxides such as Al 2 O 3 . Introducing the additional barrier into metal-vacuum interface system of the emitter can be beneficial for an improvement of...

A comprehensive investigation has been carried out to determine the source of an inherent temporal instability in the spatial distribution and the emission current obtained from field electron-emitting carbon fiber tips of type Polyacrylonitrile VPR – 19, thermally treated at 2800 °C. These instability effects have been successfully overcome by coa...

Objective Recent developments in gamma spectroscopy and data processing techniques opened up the possibility of providing high degrees of flexibility for different kinds of ambient, cosmic, and sample-related background suppression. The BALQARAD clover active shield is a newly acquired germanium detector that offers extraordinary and non-convention...

A comprehensive investigation has been carried out to determine the source of an inherent temporal instability in the spatial distribution and the electron emission current obtained from field electron-emitting carbon fiber tips of type Polyacrylonitrile VPR – 19, thermally treated at 2800 °C. These instability effects have been successfully overco...

This study introduces an easy methodology to test and analyze experimental field electron emission current-voltage data from metallic single-tip emitters; this novel and easy methodology is called the Murphy-Good plots. Tungsten electron emitters were used as an example and were prepared by the electrochemical etching process. The current-voltage c...

A poster in which we participated to Kashiwa Dark matter symposium 2020.

Superalloy inspired Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy is known for its gamma-gamma' microstructure and the third Heusler phase. Variations of this alloy, gained by replacing 0.5 or 1 at. pct Al by the equivalent amount of Mo, W, Zr, Hf or B, can show more phases in addition to this three-phase morphology. When the homogenization...

Field electron emission studies normally use Fowler-Nordheim (FN) plots to analyze measured current-voltage characteristics. More precise extraction of emitter characterization parameters could perhaps be achieved if the data were plotted as a so-called “Murphy-Good (MG) plot”. Unlike a Fowler-Nordheim plot, which is theoretically predicted to be s...

Advanced methodologies in gamma-ray spectroscopy allow for excellent background suppression and increased efficiency using composite Clover detectors with combinations of active shields. The active shield consists of multiple scintillators carefully oriented around the Ge crystals, and consist of BGO, CsI and Plastic scintillators. The events from...

Dark matter is the generally accepted paradigm in astrophysics and cosmology as a solution to the higher rate of rotation in galaxies, among other things. But since there are still some problems encountered by the standard dark matter paradigm at this scale, we have resorted to an alternative solution, similar to Milgrom's MOND. Here, we have assum...

In field electron emission (FE) studies, it is important to check and analyse the quality and validity of results experimentally obtained from samples, using suitably plotted current-voltage [I m (V m)] measurements. For the traditional plotting method, the Fowler-Nordheim (FN) plot, there exists a so-called "orthodoxy test" that can be applied to...

INFLUENCE PF POLYSTYREN DIELECTRIC COATING ON THE ELECTRON EMISSION MECHANISM OF TUNGSTEN TIPS By M’otasem M. Alabtah Supervisor Dr. Moneeb Taiseer M. Shatnawi Co-Supervisor Dr. Marwan Suleiman Mousa, Prof. ABSTRACT The research work involved in this thesis deals with the characterization of field electron emission from tungsten tips coated with di...

This work reports the results obtained from the comparison of different data analysis methods, i.e. Fowler-Nordheim, Millikan-Lauritsen, and Murphy-Good plots for the current-voltage measurements or the macroscopic current-density/ field characteristics of electrostatic field electron emission experiments. Where Fowler-Nordheim and Millikan-Laurits...

Industrial activities have the direct goal to support increasing humanity quality of life. Made experiences emphasized that beside positive direct effects of industrial activities these often have also negative, undesired and sometimes unthinkable effects on environment and society. Nowadays humanity is confronting with a series of global problems,...

U564: Field electron emission studies normally use Fowler- Nordheim (FN) plots to analyze measured current-voltage characteristics. More precise extraction of emitter characterization parameters could perhaps be achieved if the data were plotted as a so-called "Murphy-Good (MG) plot". Unlike a Fowler-Nordheim plot, which is theoretically predicted...

U564: Field electron emission studies normally use Fowler- Nordheim (FN) plots to analyze measured current-voltage characteristics. More precise extraction of emitter characterization parameters could perhaps be achieved if the data were plotted as a so-called "Murphy-Good (MG) plot". Unlike a Fowler-Nordheim plot, which is theoretically predicted...

This paper investigates field emission behavior from a surface of a tip that was prepared from polymer graphite nanocomposites subjected to electrochemical etching. The essence of the tip preparation is to create a membrane of etchant over an electrode metal ring. The graphite rod acts here as an anode and immerses into the membrane filled with alk...

The study investigated the factors that motivate secondary school physics instructors to use virtual lab simulations in teaching and learning in four regions of the Hashemite Kingdom of Jordan. To examine the research question, the study utilized a quantitative survey research methodology using a survey questionnaire consisting of 25 Likert-type sc...

In field electron emission (FE) studies, it is important to check and analyse the quality and validity of experimental current-voltage data, which is usually plotted in one of a small number of standard forms. These include the so-called Fowler-Nordheim (FN), Millikan-Lauritsen (ML) and Murphy-Good (MG) plots. The Field Emission Orthodoxy Test is a...

In field electron emission (FE) studies, it is important to check and analyse the quality and validity of results experimentally obtained from samples, using suitably plotted current-voltage [I(V)] measurements. For the traditional plotting method, the Fowler-Nordheim (FN) plot, there exists a so-called "orthodoxy test" that can be applied to the F...

This paper discusses the similarities and differences between two studies that deal with resin-coated field-emission cathodes. The two works that are compared within this paper are entitled: Hot Electron Emission from Composite-Insulator Micropoint Cathodes and Methods of Preparation and Characterization of Experimental Field-Emission Cathodes. Wit...

The objective of this work is to study differences that occur in behavior and properties of the emitted electrons beam from the tungsten (W) tips before and after coating these tips with a thin layer of a good proven dielectric materials employed. Core metallic tips have been prepared from a polycrystalline (99.995% purity) tungsten (W) wires. Anal...

Composite nano tips for field electron emission of carbon fiber with a dielectric coating layer of polystyrene were prepared and characterized. A method of electrochemical fabrication was used for the preparation of the carbon fiber tips with radii of few nanometers. The etched tips were then coated with a thin layer of polystyrene. The composite n...

Dark matter is an accepted paradigm among astrophysicists, which is proposed to explain the higher rate of rotation in galaxies. But the problem remains that all experiments to detect particles that might be dark matter candidates have given negative results so far (Arnaud et al., 2019), which is one of the main reasons why some astrophysicists beg...

This poster analyzes the differences that occurred in field electron emission and ion emission after coating some tungsten tips with a thin layer of dielectric material. The mechanism of emission of electrons the dielectric material also is described. For the purposes of analysis, the emitters were prepared by coating a tungsten tip with a layer of...