Evangelia A. Pavlatou

Evangelia A. Pavlatou
National Technical University of Athens | NTUA · Department of Chemical Sciences

Professor

About

78
Publications
15,157
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,992
Citations
Introduction
Skills and Expertise

Publications

Publications (78)
Article
Full-text available
The aim of this study is to investigate the predictive factors that predispose secondary school students’ interest in studying STEM (Science, Technology, Engineering, and Mathematics) fields in higher education. For this purpose, an already existing questionnaire was used and modified properly, according to the Greek educational system. The survey...
Article
Physical experiments on real-world systems are proposed as a means to raise learning outcomes and Arduino microcontroller is highlighted as an appropriate tool to perform them. However, experimentation on a real system may encounter various barriers. Therefore, a learning environment was developed in order to perform Arduino experiments on digital...
Article
Full-text available
A study with K-9 Greek students was conducted in order to evaluate how the declarative knowledge acquisition was affected by incorporating Arduino experiments in secondary Chemistry Education. A Digital Application (DA) that blends the use of the Arduino sensors’ experiments with digital educational material, including Virtual Labs (VLs), was const...
Article
Full-text available
Covalent organic frameworks comprise a unique class of functional materials that has recently emerged as a versatile tool for energy-related, photocatalytic, environmental, and electro-chromic device applications. A plethora of structures can be designed and implemented through a careful selection of ligands and functional units. On the other hand,...
Article
Full-text available
Background/aim: Nanomedicine is a promising scientific field that exploits the unique properties of innovative nanomaterials, providing alternative solutions in diagnostics, prevention and therapeutics. Titanium dioxide nanoparticles (TiO2 NPs) have a great spectrum of photocatalytic antibacterial and anticancer applications. The chemical modifica...
Article
Full-text available
During the last few decades, the utilization of nanotechnology is exponentially increasing in biomedical engineering applications, such as antibiotics , antimicrobial agents, and anticancer therapies. It is known that a large number of diseases caused by pathogenic microorganisms originate from the fact that these pathogens have developed resistanc...
Article
Full-text available
The multivariate condition of cancer disease has been approached in various ways, by the scientific community. Recent studies focus on individualized treatments, minimizing the undesirable consequences of the conventional methods, but the development of an alternative effective therapeutic scheme remains to be held. Nanomedicine could provide a sol...
Article
Full-text available
Direct current electrodeposited Sn–Ni/TiO2 nanostructured coatings were produced by embedding two different doped types of TiO2 particles within the alloy matrix, a commercially available doped carbon-based and doped N,S-TiO2 particles. The structural characteristics of the composite coatings have been correlated with the effect of loading, type of...
Article
Full-text available
The transmission of a wide range of diseases, related to the infection by pathogenic microorganisms is a major public health problem that daily endangers the safety of human population. Silver has been thoroughly studied and used against bacteria due to its antimicrobial properties. Nanostructured silver gathers all the advantages of the silver its...
Article
Full-text available
Alginic acid, also known as algin or alginate, is a natural carbohydrate, which is derived from marine brown algae, as well as some microorganisms. It can be used in various applications. In particular, alginate has shown great potential in the areas of wound healing, drug delivery, in vitro cell culture, and tissue engineering, allowing the catego...
Article
Full-text available
The global use of crude oil for energy applications has increased during the last decades, leading to an extensive release of oil into the environment as well. Thus, contamination deriving from oil spills and industrial wastewater has been recognized as one of the major environmental issues, imposing a serious threat to both human and marine ecosys...
Article
This paper presents an educational digital material on “solid crystal structures,” in which cartoons agents direct undergraduate students on a learning cycle of understanding concepts from the submicroscopic level and correlate with the corresponding macroscopic‐related properties. Specifically, undergraduate students are given the opportunity to s...
Article
Full-text available
In this study, the synthesis of smart, polymerically embedded titanium dioxide (TiO2) nanoparticles aimed to exhibit photo-induced anticancer properties under visible light irradiation is investigated. The TiO2 nanoparticles were prepared by utilizing the sol gel method with different dopants, including nitrogen (N-doped), iron (Fe-doped), and nitr...
Article
In chemical engineering, undergraduate students often have to face the highly demanding process of understanding concepts from the microscopic level (e.g., ionic crystals such as zinc sulphide or covalent lattice crystals diamond, graphite, graphene etc.) and then explain with certain physical–chemical properties their macroscopic behaviour. Theref...
Article
Cyclo-olefin polymer (COP) surfaces are micro-nanotextured using O2 plasma chemistry in one-step process. These surfaces subsequently display multiple functionality, (A) they are stable in time (i.e. non ageing), functional, high surface area, substrates suitable for biomolecule binding, after thermal annealing in order to induce accelerated hydrop...
Chapter
In this paper, we present five video-recorded experiments that are embedded in multimedia applications uploaded in the “Digital School-Digital educational material” platform, which is the official platform for educational material of the Greek Ministry of Education. The presented videos provide students with the basic information on how to use a mi...
Article
Full-text available
Purpose: The use of nanoparticles has seen exponential growth in the area of health care, due to the unique physicochemical properties of nanomaterials that make them desirable for medical applications. The aim of this study was to examine the effects of crystal phase-nanostructured titanium dioxide particles on bioactivity/cytotoxicity in breast c...
Article
In this study, the score equivalence of computer-based assessment (CBA) and paper-and-pencil testing (PPT) in an undergraduate course of introductory computer programing at the National Technical University of Athens' School of Chemical Engineering, was examined. The research was carried out with 211 students participating, and was realized by a sp...
Article
The present study was the first in Greece in which educational effectiveness theory constituted a knowledge base for investigating the impact of chemistry classroom environment in 10 Grade students’ enjoyment of class. An interpretive heuristic schema was developed and utilised in order to incorporate two factors of teacher behaviour at classroom l...
Article
Titanium dioxide (TiO2) nano-particles were immobilized in nickel matrix coatings using the direct current electrodeposition technique. The influence of nickel surface morphology and crystallographic orientation on the photocatalytic activity and photo-induced hydrophilicity of the composite coatings were investigated under UVA illumination. The ov...
Article
Visible light activated nanostructured TiO2 with nitrogen and fluorine co-dopants were prepared by the surfactant assisted sol–gel method and immobilized on glass substrates by dip coating. The films were inserted inside a continuous flow photoreactor and examined for the photocatalytic oxidation of NO air pollutant with initial concentration of 20...
Article
In the frame of research that examines the use of task-specific ionic liquids (ILs) for developing green methodologies toward novel bioactive compounds, ethanolamine-derived ILs were synthesized and used as solvents and catalysts in a domino Knoevenagel–Michael reaction. After extended optimization studies regarding the most important reaction para...
Article
Full-text available
This study reports research findings on whether the use of 3D visualization types i.e. Interactive 3D Virtual Environment (I3DVE), 3D Animations Interface (3DAIF) and 3D Static Illustrations Interface (3DSIIF), combined with narration and text in multimedia applications, contributes to the learning process of 12th grade students in science. A total...
Article
The removal of Cr(VI) from aqueous solutions was investigated using various minerals, such as zeolite (clinoptilolite), bentonite, exfoliated vermiculite and attapulgite. These minerals were modified using hexadecylammonium bromide (HDTMA-Br). The parameters under investigation were the HDTMA-Br concentration (0.36–8 g L−1), the pH (3–9) at which t...
Article
Nickel nanocrystalline electrodeposits were produced from a Watts type bath with the addition of cis-2-butene-1,4-diol and simultaneous application of either direct or pulse current conditions. The surface morphology, the preferred orientation, grain size and microhardness of Ni deposits were determined as functions of the concentration of the addi...
Article
Full-text available
The present paper concerns the use of animated cartoons as an assessment tool in teaching science regarding students of elementary education. Different instructional strategies are presented whereas with the aid of two sets of questions with animated cartoons, the teacher is able to: (i) find out and evaluate what students already know about specif...
Article
Nanocomposite coatings were obtained by electrochemical codeposition of TiO2 nano-particles (mean diameter 21 nm, Degussa P-25) with nickel, from an additive-free Watts type bath. Pure Ni and composite Ni-TiO2 coatings were electrolytically deposited under both direct and pulse current conditions and an extended region of electrolysis conditions (p...
Article
This study describes the development and validation of a Greek-language instrument that can be used to assess grade 10 students' perceptions of their chemistry classroom environment as a means of showing differences between chemistry learning environments in Greece (Attica) and Cyprus. The development of the instrument was based on available learni...
Article
Pure and composite nickel deposits containing nano-TiO2 particles (d m = 21 nm) were produced under direct-DC and pulse current-PC conditions. The influence of pulse frequency on the codeposition of TiO2 particles, preferred orientation of Ni crystallites and grain size, as well as microhardness of the composites, was investigated systematically. C...
Article
Nickel and nickel-phosphorous matrix composite coatings reinforced by TiO2, SiC and WC particles were produced under direct and pulse current conditions from an additive-free Watts' type bath. The influence of the variable electrolysis parameters (type of current, frequency of current pulses and current density) and the reinforcing particles proper...
Article
During the last years, the waste electrical and electronic equipment (WEEE) are gathering attention, as a very special section of waste. In fact, they have been proven to be source for the recovery of metals. In the present study printed circuit boards (PCBs) were cut and treated thermally at 500°C for 1 h in both air and nitrogen atmosphere. The o...
Article
In the present work pure nickel–phosphorous and nickel–phosphorous composite coatings with WC particles (mean diameter 200nm) have been produced under both direct and pulse current conditions, from a modified, organic-free, Watts bath. The produced coatings were thermally treated at various temperatures and the structure, morphology and the microha...
Article
Full-text available
This research aims to determine whether the use of specific types of visualization (3D illustration, 3D animation, and interactive 3D animation) combined with narration and text, contributes to the learning process of 13- and 14- years-old students in science courses. The study was carried out with 212 8th grade students in Greece. This exploratory...
Article
Full-text available
A survey exploring the views of scientists, chemists and chemical engineers, on current trends in Chemistry Education was conducted in Greece. Their opinions were investigated using a questionnaire focusing on curricula (the content and process of chemistry teaching and learning), as well as on the respondents’ general educational beliefs and their...
Article
Full-text available
This study describes the development and validation of a Greek-language instrument that can be used to assess grade 10 students' perceptions of their chemistry classroom environment as a means of showing differences between chemistry learning environments in Greece (Attica) and Cyprus. The development of the instrument was based on available learni...
Article
An additive-free Watts type bath containing micron- and nano-SiC particles (1 μm and 20 nm respectively), as well as ultrafine-WC particles (200 nm), was used for the production of pure Ni and nickel matrix composite electrocoatings under both direct and pulse current conditions. Moreover, nickel nanocrystalline deposits were obtained from a Watts...
Article
Full-text available
NiP-SiC composite coatings were produced under both direct and pulse current conditions, from an additive-free modified Watts type bath. The influence of current parameters and hydrodynamic conditions of plating bath in the structure, morphol- ogy and mechanical properties of the composite coatings were examined. Addition- ally, micro-structural an...
Article
Nanocrystalline nickel deposits were produced by applying both direct current (DC) and pulse current electroplating (PC) from an additive-free Watts type bath and in the presence of 2-butyne-1,4-diol (BD). The surface morphology, the preferred orientation, the grain size and the microhardness of the deposits were investigated. Under DC conditions,...
Article
Pure Ni and nickel matrix composite electrocoatings containing micron- and nano-SiC particles (1μm and 20nm respectively) were produced under direct and pulse current conditions from an additive-free Watts type bath. The effect of the particle size, codeposition percentage of SiC and type of imposed current on the microhardness as well as on the mi...
Article
Nickel matrix composite coatings containing micro and nano-sized SiC particles were prepared from an additive-free Watts’ type solution under direct and pulse current conditions, in order to study the correlation between SiC particles embedding and the tribological behaviour of deposits. The wear properties of Ni/SiC composite coatings were shown t...
Article
The electrolytic codeposition of ultrafine WC particles (mean diameter of 0.2 μm) from an additive-free nickel Watts' solution by applying both direct (DC) and pulse (PC) electroplating, has been investigated. Electrodeposition of Ni/WC composites was carried out on a rotating disk electrode (RDE) at various rotation velocities. The effect of type...
Article
Full-text available
The vapors of NbF5 and TaF5 have been investigated by Raman spectroscopy in the temperature range 475–675K and at total pressures from ∼0.1 to ∼4.0atm. The temperature and pressure dependence of the spectra is indicative of equilibrium shifts between monomer and associated (polymer) gaseous species. The intensities of Raman bands, which were charac...
Article
Full-text available
The picosecond dynamics of molten alkali halides is discussed, and the low-frequency Raman spectra of molten LiCl, CsCl, and the LiCl–CsCl eutectic are fitted to the model enabling to obtain the times of vibrational dephasing, τV and vibrational frequency modulation τω. In terms of the Wilmshurst criterion [J. Chem. Phys. 39, 1779 (1963)] and using...
Article
Nickel matrix composite coatings containing micron- and nano-sized SiC particles were prepared in order to study the interdependence of the SiC particles embedding and the deposits 'mechanical behaviour. SiC particles of two different sizes, namely 1 μm and 20 nm, were codeposited with nickel from Watts solutions under pulse current conditions. It...
Article
Full-text available
In this article we present the first quantitative estimates of the spectroscopically active part of the interaction potential in molten complex chlorides based on dephasing studies. We have selected the molten salt systems containing quasispherical complex MCl4−2 anions (M=Mn+2 and Zn+2) and performed the study of their ν1(A1) isotropic Raman line...
Article
Coatings applied to several mechanical parts involved in the cotton textile industry are expected to improve production efficiency and to decrease the relevant costs. The quality of cotton products is one of the most crucial parameters in the development of textile industry and is significantly associated with the mechanical and tribological proper...
Article
Full-text available
Raman spectra of solid and liquid beryllium chloride and of binary liquid BeCl2–CsCl mixtures have been measured. Systematic investigation of the Raman spectra upon heating the crystalline forms of BeCl2 revealed two different solid phase transitions at 350 and 405 °C. A glass phase was also obtained by vapour transport with a crystallisation tempe...
Article
Full-text available
As part of the ternary system Na3AlF6-Na2B4O7-TiO2, the binary subsystem: Na2B4O7TiO2 and the pseudobinary subsystem Na2B4O7-[Na3AlF6-TiO2](e) were investigated. The phase diagrams established by DTA measurements evidenced a simple eutectic point for both systems except for the concentration range >85 wt. % Na2B4O7 Of the Na2B4O7-[Na3AlF6TiO2](e),...
Article
Several spare parts of the equipment in textile industry should exhibit some special characteristics due to their continue contact with very sensible materials, such as yarns, filaments, clothes. These parts must be very smooth, hard and possess very good wear resistance. In practice, manufacturers use very often hard chromium coated parts, which b...
Article
Full-text available
A complex study was carried out on Na2B4O7-Na3AlF6 binary system by means of differential thermal analyses (DTA), X-ray diffraction as well as infrared (IR), and Raman spectroscopy. Although the system exhibits a simple eutectic at 83 wt % Na2B4O7 and Te = 642°C, interesting structural changes of borate glasses formed have been evidenced by means o...
Article
Full-text available
A complex study was carried out on Na2B4O7-Na3AlF6 binary system by means of differential thermal analyses (DTA), X-ray diffraction as well as infrared (IR), and Raman spectroscopy. Although the system exhibits a simple eutectic at 83 wt % Na2B4O7 and Te = 642 C, interesting structural changes of borate glasses formed have been evidenced by means o...
Article
Full-text available
The evolution of the Raman spectrum of amorphous GeS2 is reported over wide temperature (300 to 1075 K) and pressure (0 to 10.8 GPa) ranges. The temperature dependence shows that a-GeS2 turns gradually crystalline above Tg, first to the 3D-phase and then to the layered (2D)-phase, with the latter one being retained up to the melting point and upon...
Article
A complex study was carried out on Na2B4O7-Na3AlF6 binary system by means of differential thermal analyses (DTA), X-ray diffraction as well as infrared (IR), and Raman spectroscopy. Although the system exhibits a simple eutectic at 83 wt% Na2B4O7 and Te D642 ±C, interesting structural changes of borate glasses formed have been evidenced by means of...
Article
Full-text available
Computer simulations of the short-time, vibrational dynamics of the network-forming ionic melts, LaCl3 and ZnCl2, and of their mixtures with network-breaking alkali halides are described. In the mixtures, high frequency peaks in the vibrational density of states are shown to be describable in terms of the normal coordinates of vibration of transien...
Article
Full-text available
Photon correlation spectroscopy in both polarized and depolarized geometries has been utilized to study density and orientation fluctuations in ZnCl2, ZnBr2, and their symmetric mixture in the metastable supercooled state. The pure components display behavior intermediate between strong and fragile glasses reflected in the shape (L(log τ)) and dyna...
Article
Full-text available
Molten mixtures of lithium chloride and cesium chloride have been studied using Raman spectroscopy at temperatures up to 850 °C. Reduced isotropic and anisotropic Raman relative intensities have been measured at different compositions and temperatures. The spectra of the mixtures show two bands with ‘‘characteristic’’ frequencies ωCs and ωLi close...