Evangelia A. Pavlatou

National Technical University of Athens | NTUA · Department of Chemical Sciences

Zinc oxide (ZnO) possesses exceptional potential to be utilized in water and wastewater treatment applications, either as a photocatalyst or in membrane incorporation. In the present study, ZnO nanoparticles were synthesized using the precipitation method. The Taguchi approach with the L32b orthogonal array was utilized in order to optimize the exp...

Aquatic habitats cover almost 70% of the Earth, containing several species contributing to marine biodiversity. Marine and aquatic organisms are rich in chemical compounds that can be widely used in biomedicine (dentistry, pharmacy, cosmetology, etc.) as alternative raw biomaterials or in food supplements. Their structural characteristics make them...

This review study aims to present, in a condensed manner, the significance of the use of crystalline carbon-based nanomaterials in biomedical applications. Crystalline carbon-based nanomaterials, encompassing graphene, graphene oxide, reduced graphene oxide, carbon nanotubes, and graphene quantum dots, have emerged as promising materials for the de...

Organic pollutants found in industrial effluents contribute to significant environmental risks. Degradation of these pollutants, particularly through photocatalysis, is a promising strategy ensuring water purification and supporting wastewater treatment. Thus, photodegradation of rhodamine B and phenol under visible-light irradiation using TiO2/SiO...

Over the last ten years, there has been a growing interest in metal-organic frameworks (MOFs), which are a unique category of porous materials that combine organic and inorganic components. MOFs have garnered significant attention due to their highly favorable characteristics, such as environmentally friendly nature, enhanced surface area and pore...

21ου αιϊνα κακϊσ και δεξιότθτεσ επιςτθμονικισ μεκοδολογίασ. Στο νζο Πρόγραμμα Σπουδϊν, παρουςιάηεται θ Χθμεία ωσ κφριο εργαλείο για τθν πρόοδο, τθν οικονομικι ανάπτυξθ και τθν ευθμερία των ςφγχρονων κοινωνιϊν, ενϊ αναδεικνφεται, για πρϊτθ φορά, ο ρόλοσ που καλείται να παίξει θ Χθμεία ςτθ διαμόρφωςθ των ενεργειακϊν πολιτικϊν του 21ου αιϊνα. Το περιε...

2013

The adhesion enhancement of a graphene oxide (GO) layer on porous ceramic substrates is a crucial step towards developing a high-performance membrane for many applications. In this work, we have achieved the chemical anchoring of GO layers on custom-made macroporous disks, fabricated in the lab by pressing α-Al2O3 powder. To this end, three differe...

Among key issues in municipal wastewater treatment plants (MWTP) is the existence of pathogenic bacteria in the discarded effluents. Conventional disinfectants (ozone, UV irradiation, chlorine) have been insufficient in providing safe water due to the development of undesirable and noxious by-products. TiO2 comprises an attractive alternative to co...

Early-stage, precise disease diagnosis and treatment has been a crucial topic of scientific discussion since time immemorial. When these factors are combined with experience and scientific knowledge, they can benefit not only the patient, but also, by extension, the entire health system. The development of rapidly growing novel technologies allows...

The aim of the present study was to investigate the photoinduced properties of nitrogen-doped titanium dioxide (N-TiO2) against the Salmonella ser. Typhimurium bacterial biofilm, under visible-light irradiation. The capability of N-TiO2 nanoparticles working as multipurpose materials with antimicrobial applications, as well as environmental ones, w...

The contemporary lifestyle of the last decade has undeniably caused a tremendous increase in oxidative-stress-inducing environmental sources. This phenomenon is not only connected with the rise of ROS levels in multiple tissues but is also associated with the induction of senescence in different cell types. Several signaling pathways that are assoc...

The primary objective of this research is to propose and compile a specific protocol for photocatalytic measurements of modified TiO2 particles under visible-light irradiation. Nitrogen-modified titanium dioxide (N-TiO2) powder was synthesized by the sol–gel method and characterized by X-ray Diffraction Analysis (XRD), Field Emission Scanning Elect...

The synthesis of titania-based composite materials with anticancer potential under visible-light irradiation is the aim of this study. In specific, titanium dioxide (TiO2) nanoparticles (NPs) chemically modified with silver were embedded in a stimuli-responsive microgel (a crosslinked interpenetrating network (IP) network that was synthesized by po...

Semiconductor photocatalysts, particularly ZnO nanoparticles, were synthesized via the precipitation method using four different precursors (zinc acetate/zinc nitrate/zinc sulfate/zinc chloride) and compared, according to their optical, structural, photocatalytic, and anticancer properties. The materials were characterized via X-ray Diffraction met...

Η Χημεία διακρίνεται για το εύρος των εφαρμογών της, το οποίο άπτεται όλων, σχεδόν, των πτυχών της καθημερινότητας, της τεχνολογικής, της οικονομικής και της αειφόρου ανάπτυξης. Σκοπός της παρούσας εργασίας είναι να αναδείξει το νέο Π.Σ Χημείας Λυκείου, το οποίο σχεδιάστηκε με τέτοιο τρόπο, ώστε να δώσει την ευκαιρία στους μαθητές να συμμετέχουν σε...

Carbon quantum dots are a new class of zero-dimensional carbon nanomateri-als that due to their low toxicity, high water dispersibility and fluorescent properties, have attracted o lot of attention for biomedical applications. They can be synthesized with many different methods through both bottom-up and top-down approaches. In this mini review we...

Graphene oxide (GO) oligo-layered laminates were self-assembled on porous ceramic substrates via their simple dip-coating into aqueous GO dispersions. To augment the stability of the developed composite GO/ceramic membranes and control the morphology and stacking quality of the formed laminate, short-((3-glycidoxypropyl)trimethoxy silane-GLYMO, (3-...

Ο Οδηγός Εκπαιδευτικού για τη Χημεία του Γενικού Λυκείου έχει σκοπό να αναδείξει το περιεχόμενο και τις διδακτικές μεθοδολογίες που εισάγει το Πρόγραμμα Σπουδών (ΠΣ). Περιλαμβάνει θεωρητική θεμελίωση, διδακτικά σενάρια και φύλλα εργασίας, ενδεικτικούς προγραμματισμούς Θεματικών Ενοτήτων, ενδεικτικού ψηφιακού υλικού ανά ενότητα, παρατηρήσεις, επισημ...

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...

The modern era is characterized by the explosion of Information and Communication Technologies (ICT) and their multiple applications both in the school community and in the extracurricular activities. ICT enables the school community to be engaged in new educational storytelling approaches with educational and learning content, using multimedia app...

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...

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...

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,...

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...

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...

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...

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...

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...

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...

Surface-enhanced Raman Scattering (SERS) constitutes a powerful molecule detection and identification method. However, the design of a suitable substrate, which combines ease of use with reproducibility, remains a major problem. In this study, the use of silver mesoparticles (AgMPs) as SERS substrate was investigated. A green methodology was applie...

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...

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...

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...

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...

The scope of the current research was to assess the feasibility of encapsulating three commercial antifouling compounds, Irgarol 1051, Econea and Zinc pyrithione, in biodegradable poly(lactic acid) (PLA) nanoparticles. The emulsification-solvent evaporation technique was herein utilized to manufacture nanoparticles with a biocide:polymer ratio of 4...

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...

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...

Τα ψηφιακά βιβλία (e-books) μπορούν να προσφέρουν στους μαθητές της πρωτοβάθμιας και δευτεροβάθμιας εκπαίδευσης επιπλέον μαθησιακούς πόρους σε σύγκριση με τα παραδοσιακά βιβλία. Προς αυτή την κατεύθυνση έχουν εμπλουτιστεί τα ψηφιακά βιβλία με γνωστικό αντικείμενο τη Χημεία, όπως τα «Φυσικά» Ε’ Δημοτικού (2ο Κεφάλαιο) και «Χημεία» Γ’ Γυμνασίου (2ο Κ...

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...

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...

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...

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...

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...

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...

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...

In comparison with the traditional books, e-books can provide students of elementary and secondary education with increased resources, and in turn promote their learning effectiveness and outcome. In this work, in order to make the use of e-books more appealing to students from different ages; we have enriched them with multimedia educational games...

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...

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...

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...

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...

Η διαδραστική πολυμεσική εφαρμογή αναφέρεται στην ενότητα «Χημική κινητική» που διδάσκεται στο μάθημα της Χημείας Β΄ Λυκείου Θετικής Κατεύθυνσης και ακολουθεί βασικές αρχές της διερευνητικής μάθησης. Η εφαρμογή αποσκοπεί στη διδασκαλία της χημικής κινητικής μέσα από προσομοιώσεις πειραμάτων, διαδραστικά διαγραμμάτα, και υπολογισμούς, χρησιμοποιώντα...

Η παρούσα εργασία έχει ως σκοπό την αξιολόγηση της αξιοποίησης διαδραστικών πολυμεσικών εφαρμογών, οι οποίες κατασκευάστηκαν στα πλαίσια του εμπλουτισμού των σχολικών εγχειριδίων με ψηφιακό υλικό για το κεφάλαιο της Βιολογίας Γ’ Γυμνασίου «Οργάνωση της ζωής – Βιολογικά συστήματα». Για διδασκαλία διάρκειας τεσσάρων διδακτικών ωρών κατασκευάστηκαν δέ...

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...

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...

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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...

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...

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...

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...

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...

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...

The aim of this research was 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 17 and 18 years-old students in science courses. The study was carried out in Greece in a sample of 114 students of 12th g...