Rodica-Mariana Ion

Valahia University of Târgoviste · Doctoral School of Materials Engineering

Surface potential (SP) examination and FT–IR (infrared) reflection–absorption spectra were used for the characterization of interfacial effects in organic dye thin layer on solid substrates. Surface potentials of magnesium tetranaphtylporphyrin (MgTNP), magnesium or lead phthalocyanine monolayer on the water subphase were measured and the dipole mo...

Nanocomposite of polypyrrole and iron oxide were prepared using simultaneous gelation and polymerization processes. Varied amounts of pyrrole were added to a solution containing an Fe(III) salt as precursor and 2-metoxy ethanol as solvent. The particles were found to be nanocrystalline. However, the composites exhibited mixed phase, belonging to bo...

Phosphorus-nitrogen intumescent product (R2000) was filled into polypropylene (PP) as a flame retardant. The neat PP and flame-retarded PP blends were studied for their structural and mechanical properties after verification of the flame retardancy character of blends. In this paper, the influence of incorporation of different amount (5%, 10%, 15%,...

The porphyrins seem to be the most effective photosensitizers in photodynamic therapy of cancer. Monomers and dimers of sulfonated and nonsulfonated porphyrins [5,10,15,20-tetra-phenyl-porphyrin, 5,10,15,20-tetra-naphtyl-porphyrin (TNP), 5,10,15,20-tetra-p-sulfonato-phenyl-porphyrin (TS4PP) and 5,10,15,20-tetra-p-sulfonato-naphtyl-porphyrin], are s...

Four various phthalocyanines dyes were oriented in uniaxially stretched polymer films. Polarized absorption, fluorescence, and photoacoustic spectra were measured. From a stepwise reduction procedure, the orientation of molecules with respect to the film stretching direction as well as the orientation of absorption transition moments vectors with r...

In this paper, based on our previous expertise on ceramic artifacts, several archaeometric methods applied to some samples collected from the Dudești archaeological site (Oltenia region, Romania) are reported for the first time in the literature. The chemical composition and microstructural and morphological characterization of these samples offer...

Historical monuments (palaces, churches, protected urban areas, so on) are integral part of the national cultural heritage which need activities and measures to protect them. The Banloc complex, located in the west of Romania, encompasses five buildings: the castle, the hunting pavilion, the kitchen, housekeeper house, and the stall. This study inv...

Lignocellulose material is the main natural resource for the pulp and paper industry, and for its application the material should have a degree of whiteness as high as possible. For this reason, different bleaching treatments were applied during time. In this paper, the photobleaching induced by solar light of a lignocellulosic biomass using NaClO...

The paper aims to conduct a novel investigation of ceramic samples from the Trophaeum Traiani Monument in Romania using various nuclear analytical techniques such as WDXRF, XRD, neutron diffraction, and neutron tomography, which will be complemented by FTIR and Raman spectroscopy data. The experimental data gathered revealed the mineral and chemica...

A cost-effective solution to the problems that the automotive industry is facing nowadays regarding regulations on emissions and fuel efficiency is to achieve weight reduction of automobile parts. Glass fiber-reinforced polymers are regularly used to manufacture various components, and some parts may also contain thermoplastic elastomers for toughn...

In this paper B-oxide sintering process and Spark plasma Sintering (SPS) method is used to synthesize 0.88Pb(Zr 0.52 Ti 0.48 )O 3 – 0.12Pb(Mn 1/3 Sb 2/3 )O 3 – x at%Pr complex system where x = 0 and 0.02. The sintering temperature used in the SPS technique is considerably lower than that used in the B-oxide method (200 to 400 o C) with significant...

Technique development for getting environmentally friendly nanomaterials was the paper's main goal. Spectroscopic techniques were utilized to characterize the plant extracts used in this work (UV-Vis, FTIR and Raman). In this case, plants from the Valea Voievozilor was processed in a dry state, was used at the ideal moment and at the plant's peak m...

The paper aims to conduct a novel investigation of some ceramic samples that were taken from Hunedoara's Corvins' Castle (Romania). Some nuclear analytical techniques, such as WDXRF, XRD, neutron diffraction, and neutron tomography, will be used in the investigations. These techniques will be correlated with data from FTIR and Raman spectra. There...

The aim of the paper is a comparative testing of two Paraloid resins (B-72 and B-67), in order to determine which is the most efficient for the protection of wood artifacts. Healthy Spruce wood samples were cut (3cm ×3cm ×0.7cm) and covered by brushing with 3 layers of a Paraloid B 72 10% solution (solvent acetone: ethanol 1:1) and with a solution...

The doped Pb(Zr 0.52 Ti 0.48 )O 3 system with Nb ⁵⁺ and Sr ²⁺ were obtained by solid state reactions. The influence of nature of dopants on structural and microstructural properties were analyzed by XRD and SEM techniques and were also investigated the obtained dielectric and piezoelectric properties. The XRD analyzes and the SEM images highlighted...

Citation: Iancu, L.; Grigorescu, R.M.; Ion, R.-M.; David, M.E.; Predoana, L.; Gheboianu, A.I.; Alexandrescu, E. Abstract: This paper presents the synthesis of the triple substituted carbonated hydroxyapatite with magnesium, strontium and zinc (Mg-Sr-Zn-CHAp), as well as its structural, morphological and compositional characterization. The analytica...

The aim of the paper is a spectral study of a mural fresco from Serbesti wooden church, Dambovita county, partially painted, a historical monument from 1828 (or 1804 after some other documents). Spectral techniques as X-ray Fluorescence wavelengths dispersive (WDXRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) or Raman...

Citation: Baldea, I.; Danescu, S.; Tabaran, F.; Filip, A.G.; Ion, R.M.; Olteanu, D.E.; Sevastre-Berghian, A.C.; Decea, R.M.; Iacovita, C.; Hanganu, D.; et al. Inhibition of Survival Mechanisms and Cell Death Induction in Melanoma Following Photodynamic Therapy Mediated by Meso-5,10,15,20-tetrakis-(4-hydroxyphenyl)-porphyrin. Processes 2023, 11, 917...

The current work deals with specific investigations on the ceramic fragment samples from the archaeological site of Topolița (Eastern Romania), which is essentially unexplored to date. X-ray diffraction (XRD) has shown that the ceramics contain quartz, berlinite, mica (muscovite), calcite, and opaque minerals, such as hematite. All evidence indicat...

Currently, approximately 70% of paintings in museum collections are affected by the presence of metallic soaps, evidenced by spherical globules visible on the surface of the paintings. They are responsible for altering the paintings’ surface through processes such as exfoliation and cracking, or even in the form of surface “skins” that appear in th...

In the context of an imperious necessity to reduce the high amount of electric and electronic equipment waste, mainly by recycling also the plastics, not only the noble metals, the paper aims to reuse as reinforcing fillers some blends of polystyrene fraction of WEEE and the non-metallic part of printed circuit boards (WPCB). Elastomeric materials...

search of new food-grade pH sensitive formulations, red beet extract rich in betacyanin was included in different inorganic matrices based on silica and aluminosilicate to improve the stability of the dye. By the direct method of encapsulation of the pigments in silica support, stabilizing agents such as inclusion complex forming ?-cyclodextrin and...

The aim of the paper consists in assessing the protection of fir wood samples against UV degradation by using polyacrylates and titanium dioxide as absorber. The irradiation was achieved for 648 hours, considered as about 2 years of weathering. Colorimetric, water absorption, and mechanical investigations were performed on samples before and after...

The aim of the paper was to develop methods for obtaining environmentally friendly nanomaterials. The plant extracts used in this paper were characterized by spectroscopic methods (UV-Vis, FTIR and Raman). In this regard, it was used vegetal material at the optimal time and in the period of maximum maturity of the plant, from the geographical area...

The aim of the paper consists in the study of three Romanian types of marble (Ruschita, Albesti, Carrara) with different compositions in different temperature conditions, for different periods of time. The three samples were exposed to two different types of treatments: 25 cycles of freeze-thaw (according to SR EN 12371) and 3 cycles of exposure to...

The aim of the paper consist in the synthesis of double substituted carbonated hydroxyapatite using Zn2+ and Mg2+ ions in comparison with the previous obtained Sr-Zn-CHAp. Fourier transform infrared spectroscopy, X-ray diffraction, environmental scanning electron microscope (ESEM) coupled with EDS is used to highlight the presence of the metallic i...

Innovative composites based on polypropylene waste impurified cu HDPE (PPW) combined with two thermoplastic block-copolymers, namely styrene-butadiene-styrene (SBSBC) and styrene-isoprene-styrene (SISBC) block-copolymers, and up to 10 wt% nano-clay, were obtained by melt blending. SBSBC and SISBC with almost the same content of polystyrene (30 wt%)...

Paper aging and protection processes play an essential function in the preservation of library collections and archives. In this study, some physical-mechanical properties of paper samples from XXth century books (private collections), such as pH acidity, tensile strength, and modulus of elasticity, as well as optical properties, such as absolute c...

In this work, new treatments based on multi-walled carbon nanotubes (MWCNTs), MWCNTs decorated with zinc oxide (ZnO), MWCNTs decorated with hydroxyapatite (HAp) and MWCNTs decorated with silver (Ag) nanoparticles dispersed in PHBHV solution are proposed for improving sound oak wood properties. We hypothesize that the solutions containing decorated...

Introduction: History can be defined as the study of people who have lived in the past. From one generation to another, people transmit values and knowledge through art. The more efficient the processes of evaluation, cleaning, and restoration of cultural heritage, the more efficient the communication between generations. Over time, the painting un...

(1) Background: Due to the precarious situation of many monuments or archeological sites, analytical investigations are necessary to obtain information about the used materials, as well as to identify the most appropriate solutions for their conservation/restoration. This paper addresses the characterization of mural painting fragments collected du...

Background and aim: Photodynamic therapy, PDT, is a promising option among the local treatments with oncolytic potential. Although the basic principle is simple, its intricate mechanisms allow for a broad range of optimization methods. The purpose of this study was to assess the effects of Resveratrol and Curcumin as adjuvants of PDT on experiment...

Worldwide, one of the most significant threats to human health problems remains antibiotic resistance [...]

(1) Background: In time, stone monuments suffer a process of aging and loss of aesthetic and mechanical properties. In order to restore and stop the loss of their properties, various treatments are used, and in this context, a new class of discovered materials with interesting properties are layered double hydroxides or LDHs. (2) Methods: The LDHs,...

The cultural heritage field represents a witness to artifacts values in a continuous evolution, it strongly influences our sense of identity and our behavior as people. To protect these archaeological treasures, different conservation and restoration methods are required. Considering the field of priceless artifacts, our research direction led us t...

The present work aims to study the adsorption processes and the photochemical depollution of the waters contaminated with Direct Orange textile dyes - 26 released into the water. Also, the paper shows the polysulfone (PSf) membranes, used for adsorption processes of the textile dyes azo - direct-orange-26, presenting the kinetics and experimental a...

Citation: Rizescu, C.E.; Zaulet, I.-O.; Vasile, D.A.; Vincze, I.; Marin, L.; Ion, R.M. The Effects of Different Temperature Conditions on Marble Properties. Chem. Proc. 2022, 7, 45.

Introduction: History can be defined as the study of people who have lived in the past [...]

Introduction: Silver nanoparticles (AgNPs), widely recognized for their antimicrobial and antioxidant capacity, can be prepared following both conventional and unconventional routes and have a multitude of applications in numerous scientific domains, including the catalytic degradation of dyes that result from the textile industry [1,2]. The presen...

The phytosynthesis of metallic nanoparticles (MNPs) represents an interesting domain of research, with promising perspectives especially in medicine and food protection. A special area represents biosynthesis of MNPs by vegetal materials. In the present research, synthesis of silver nanoparticles (AgNPs) was obtained through a simple method, using...

Introduction: Silver nanoparticles (AgNPs), widely recognized for their antimicrobial and antioxidant capacity, can be prepared following both conventional and unconventional routes and have a multitude of applications in numerous scientific domains, including the catalytic degradation of dyes that result from the textile industry [...]

In this study curcumin was immobilized in a silica matrix to overcome its poor aqueous solubility and rapid degradation profile. Two kinds of sol–gel powders based on colloidal silica were synthesized and characterized, one prepared with an ethanolic solution of curcumin and the other using cethyltrimethylammonium bromide (CTAB) to solubilize the d...

This research focuses on the synthesis of multi-walled carbon nanotubes (MWCNTs) decorated with TiO2 nanoparticles (NPs) and incorporated in cellulose acetate-collagen film in order to obtain a new biomaterial with potential biomedical applications and improved antimicrobial activity. The successful decoration of the MWCNTs with TiO2 NPs was confir...

In this study, it was reported the preliminary results on the chemical and structural composition of decorative elements remains from original Roman mosaic fragments collected from the Roman Mosaic Museum, Constanta (Romania). These investigations were carried out by using non-destructive and micro-invasive techniques such as optical microscopy, X-...

In this study, it was reported the preliminary results on the chemical and structural composition of decorative elements remains from original Roman mosaic fragments collected from the Roman Mosaic Museum, Constanta (Romania). These investigations were carried out by using non-destructive and micro-invasive techniques such as optical microscopy, X-...

Problemele legate de conservarea descoperirilor arheologice excavate au cea mai mare relevanță astăzi. De cele mai multe ori, acestea au fost asimilate într-o manieră eronată, ca un amestec dintre o disciplină de cercetare (arheologie) și o profesie care urmărește păstrarea și îngrijirea obiectelor de patrimoniu (conservare). Conform acestui punct...

In recent years, the rising number of bone diseases which affect millions of people worldwide has led to an increased demand for materials with restoring and augmentation properties that can be used in therapies for bone pathologies. In this work, PMMA- MBG composite scaffolds containing ceria (0, 1, 3 mol%) were obtained by the phase separation me...

Multifunctional composite coatings composed of metal oxide nanoparticles dispersed in polymer matrices are an advanced solution to solve the problem of stone heritage deterioration. Their innovative design is meant to be stable, durable, transparent, easy to apply and remove, non-toxic, hydrophobic, and permeable. Coating formulations for the prote...

The present paper is focused on the microclimatic investigation and weather-climatic phenomena matrix assessment, which can be generated for heritage objectives at different spatial and temporal resolutions, correlated with physicochemical analysis of the particulate matter (PM2.5-10). In the literature the importance of atmospheric PM monitoring i...

Recycling of electric and electronic equipment is an emerging global issue in order to decrease the high amount of waste deposited on landfill or incinerated, and thus reducing the environmental pollution. Different strategies of eliminating this waste can be applied. In this paper, the non‐metallic fraction of printed circuit boards, due to the co...

The dye-sensitized solar cells (DSSC) and thin-layer heterojunctional solar cells have attracted much attention as an alternative to relatively expensive silicon-based solar cells. Among the various photosensitizers used to build these cells, porphyrins have proven to be outstanding candidates due to their strong absorption in the visible region an...

The Scientific Committee on Health, Environmental and Emerging Risks (SCHEER) was requested by the European Commission (EC) to provide a scientific opinion on the safety of breast implants in relation to anaplastic large cell lymphoma (ALCL). There are several types of textured breast implants; surface textures of breast implants are not all manufa...

In this study, multi-walled carbon nanotubes (MWCNTs) were decorated with different types of nanoparticles (NPs) in order to obtain hybrid materials with improved antimicrobial activity. Structural and morphological analysis, such as Fourier transformed infrared spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy,...

Green chemistry is constantly detaching itself as an important alternative to conventional chemical routes since it is environmentally friendly, cost-effective, neither does it require the use of toxic chemicals nor does it produce hazardous by-products. For preparing eco-friendly silver and gold nanoparticles, numerous plants have been used and th...

Methylene blue is generally used as dyeing agent in textile, printing and pharmaceutical industries, which leads to the obtaining of large amounts of wastewater. The purpose of this study is to remove methylene blue dye from aqueous solutions using fir wood sawdust waste as low cost biosorbent material. In order to evaluate the adsorption process,...

Photodynamic inactivation is known as a new antimicrobial photodynamic therapy (aPDT). It is based on the administration of a photosensitizer located in the bacterial/viral cell followed by exposure to light radiations (with a proper wavelength corresponding with the maximum value of absorption of the photosensitizer) that generate singlet oxygen o...

The aim of this study was to address one of the major challenges of the conservation state of wooden artifacts or artworks namely, the preservation and restoration of wood surfaces. The factors involved in the deterioration of wood are mainly the external factors such as fire, low temperature and microbiological agents, which induce some degradatio...

Macro-heterocyclic compounds, such as porphyrins and phthalocyanines, are being studied extensively for their important physical and chemical properties. Their ability to absorb light throughout the spectrum and self-organization being adequate for the realization of several applications. Investigations of the spectral properties of the supramolecu...

In recent years pharmaceutical formulations using polymeric nanocapsules have been widely studied for developing novel drug delivery strategies. Nanocapsules provide a unique core-shell nanostructure, consisting of a liquid/solid core surrounded by a polymeric shell. Natural or modified polysaccharides are prime candidates for use as building block...

Scientific studies have demonstrated that the vegetable material extracts act as potential precursors for the synthesis of nanomaterial using eco-friendly ways. Because the plant extracts contain various secondary metabolites, they act as reducing and stabilizing agents for the bioreduction reaction for synthesis of novel metallic nanoparticles. He...

Chronic neuropathic pain and particularly peripheral pain related with diabetes is a cause 18 of great concern for diabetic patients. The current treatment includes numerous agents including 19 capsaicinoids' known as a deterrent of neuropathic pain despite their inconvenients associated with 20 local side effects. In this context, the current work...

Green chemistry is a state-of-the art method widely recognized as a useful tool for promoting and enabling sustainable development at both laboratory and industrial scale characterized by the use of environmentally friendly materials such as bacteria, fungi, and different plant species. Metallic nanoparticles exhibit attractive and unique propertie...

Green chemistry is constantly detaching itself as an important alternative to conventional chemical routes since it is environmentally friendly, cost-effective, neither does it require the use of toxic chemicals nor does it produce hazardous by-products. For preparing eco-friendly silver and gold nanoparticles, numerous plants have been used and th...

The Scientific Committee on Health, Environmental and Emerging Risks (SCHEER) was requested by the European Commission to provide a scientific opinion on the safety of breast implants in relation to anaplastic large cell lymphoma (ALCL). Literature searches were carried out using PubMed and Find-eR. The publication period covered was from 1 Septem...

Some ceramics samples from Corvins'Castle Court Area, in different weathering stages, have been analysed in this paper by different analytical techniques: XRD, thermal analysis (TG, DTG), porosity and thermoluminescence (TL) dating. For identification of the technology employed in the pottery production, the firing temperature could be determined t...

In this paper, multi-walled carbon nanotubes have been prepared at low synthesis temperatures and without high pressure by a simple chemical route. Fourier transformed infrared spectroscopy, Raman spectroscopy and X-ray diffraction analysis was used to determine the purity of the synthetized compound. Also, by transmission electron microscopy and a...

Pumpkin (Cucurbita maxima) is a fruit packed with vitamins and nutrients beneficial to human health with numerous therapeutic uses including antiparasitic, antioxidant, it helps to lower bad cholesterol, as an adjuvant in weight loss, improves cancer prevention, etc. Pumpkin is rich in beta-carotene, and contains significant amounts of lutein and z...

The present research describes the components of the ivy (Hedera helix L.) plant extract. It is known that ivy presents a lot of health benefits, like antibacterial, antimicrobial, anticancer properties or skin care, due to their components. So, the aim of our study was to characterize quantitative (polyphenols, tannins, flavonoids, terpenoids) and...

The International Conference on Emerging Technology and Innovation for the Conservation of Cultural Heritage (ETICCH) aims at building a relationship between science and sustainable conservation. To this end, ETICCH is committing to bringing together conservators, restorers, curators, bibliographers, archivists, conservation scientists, chemists, p...

The present research describes the components of two types of medicinal plants. [...]

Knowledge from materials science can be used to design systems that target specific issues in the conservation of cultural heritage, such as cleaning, consolidation, and anion removal. Layered double hydroxides are a group of anionic clays that have several properties of interest in the field of heritage conservations, one of them being the propert...

Knowledge from materials science can be used to design systems that target specific issues in the conservation of cultural heritage, such as cleaning, consolidation, and anion removal. Layered double hydroxides are a group of anionic clays that have several properties of interest in the field of heritage conservations, one of them being the propert...

The Casino building from Constanta is the most important and characteristic public building [...]

Knowledge from materials science can be used to design systems that target specific issues in [...]

Hydroxyapatite is mainly used in biomedical applications because of its very important property—bioactivity. [...]

Nowadays, more than ever, cultural heritage is linking humanity to its history. In order to [...]

The history portrays the identity of a culture, of people and various civilizations, which has [...]

In the last decades, the waste electric and electronic equipment (WEEE) has increased substantially due to an accelerated development of the economy and the lifetime of electronics.

Carbonated hydroxyapatite (CHAp) is an inorganic compound with various applications that presents better homogeneity and consolidating effect than HAp [1]. [...]

Knowledge from materials science can be used to design systems that target specific issues in the conservation of cultural heritage, such as cleaning, consolidation, and anion removal. Layered double hydroxides are a group of anionic clays that have several properties of interest in the field of heritage conservations, one of them being the propert...

The study aim was the synthesis and characterization by thermal and structural properties of nanofibers, obtained by electrospinning using styrene butadiene blockcopolymers (SBS) and styreneisoprene blockcopolymers (SIS), as well as their composites with isofural. In the first step, styrenebutadiene blockcopolymers (SBS) and styrene isoprene blockc...

Carbon nanotubes (CNTs) have attracted attention, due to their structures as well as their ability to present multiple walls. [...]