In this study, multi-walled carbon nanotubes (MWCNTs) were decorated with different types of nanoparticles (NPs) in order to obtain hybrid materials improved antimicrobial activity. Structural and morphological analysis, such as Fourier transformed infrared spectroscopy, Raman X-ray diffraction, transmission electron microscopy, environmental scanning microscopy/energy-dispersive spectroscopy the Brunauer–Emmett–Teller technique used investigate decoration NPs. Analysis showed a narrow size...

Carbonated hydroxyapatite derivatives (CHAp) and its metallic (Ag, Sr, Ba, K, Zn) have been prepared characterized in this paper their coating capacity on some model stone samples evaluated discussed. These compounds were by using several analytical tools, including X-ray diffraction analysis (XRD), thermogravimetric (TGA), Fourier transform infrared spectroscopy (FTIR), to determine the purity of CHAp sample. The XRD FTIR results confirmed presence AB-carbonated type CHAp. thermal (TGA)...

This research focuses on the synthesis of multi-walled carbon nanotubes (MWCNTs) decorated with TiO2 nanoparticles (NPs) and incorporated in cellulose acetate-collagen film order to obtain a new biomaterial potential biomedical applications improved antimicrobial activity. The successful decoration MWCNTs NPs was confirmed by several structural morphological analysis, such as Fourier transformed infrared spectroscopy, Raman X-ray diffraction transmission electron microscopy. obtained...

The color characteristics, vibration spectra, phase and mineral composition, internal structural organization of several fragments the ancient Roman mosaics from Mosaic Museum, Constanta, Romania were studied by non-destructive (Chromatic analysis, Neutron Diffraction, Tomography) micro-invasive techniques (Optical Microscopy, X-ray Field Emission Scanning Electron Microscopy–Energy Dispersive Spectroscopy, Raman Wavelength Dispersion Fluorescence). These investigations performed in order to...

(1) Background: Due to the precarious situation of many monuments or archeological sites, analytical investigations are necessary obtain information about used materials, as well identify most appropriate solutions for their conservation/restoration. This paper addresses characterization mural painting fragments collected during excavation in 2018 Rapoltu Mare (La vie), Deva. (2) Methods: Specific techniques were used, follows: X-ray diffractometry (XRD), wavelength dispersive fluorescence...

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 X-ray diffraction analysis was used to determine the purity of synthetized compound. Also, transmission electron microscopy atomic force microscopy, diameter between 9 nm 43 approximately 500–600 in length nanotubes, confirmed. Further, functionalized with negative charged functional...

In this work, new treatments based on multi-walled carbon nanotubes (MWCNTs), MWCNTs decorated with zinc oxide (ZnO), hydroxyapatite (HAp) and silver (Ag) nanoparticles dispersed in PHBHV solution are proposed for improving sound oak wood properties. We hypothesize that the solutions containing will be more efficient as consolidants, not only because of improved mechanical properties treated but also hydrophobic layer created surface. order to test these hypotheses, treatments’ potential was...

Abstract Lignocellulose material is the main natural resource for pulp and paper industry, its application should have a degree of whiteness as high possible. For this reason, different bleaching treatments were applied during time. In paper, photobleaching induced by solar light lignocellulosic biomass using NaClO was studied. The colorimetric measurements, UV spectra absorption, FTIR changes are evaluated discussed in paper. L*a*b parameters can be considered proof reactions generated...

The aim of this paper is to analyze the construction materials (mortars) an architectural monument (Deserted Tower (Lilly Tower) from Corvins’ Castle, Romania). mortars were characterized following a multidisciplinary approach, combining macroscopic observation with petrographic microscopy, mineralogical analysis (X-ray diffraction) and elemental fluorescence), hydric properties, color representative samples monument. results revealed use gypsum (produced by lumps higher Fe content), minor...

This paper presents the synthesis of triple substituted carbonated hydroxyapatite with magnesium, strontium and zinc (Mg-Sr-Zn-CHAp), as well its structural, morphological compositional characterization. The analytical techniques used (WDXRF, XRD FTIR) highlighted, on one hand, B form for apatite structure, presence three metal ions in other hand (small shifts 1120–900 cm−1 500–600 absorption peaks due to metals incorporated into CHAp structure). ratio between metallic that substitute...

Abstract Recycling of electric and electronic equipment is an emerging global issue in order to decrease the high amount waste deposited on landfill or incinerated, thus reducing environmental pollution. Different strategies eliminating this can be applied. In paper, non‐metallic fraction printed circuit boards, due contained glass fiber rigid epoxy matrix, are considered suitable for valorization as reinforcing filler polyvinyl chloride recovered from insulation cables. The composites...

This paper aims with the preparation of Sr2+ and Zn2+ double substituted carbonated hydroxyapatite (Sr-Zn-CHAp) by nanoemulsion method to evaluate its consolidation capacity on artificial stone samples. The changes in CHAp lattice parameters were observed a synergy between shrinkage dilatation induced two metallic ions, different ionic radii comparison calcium. changed morphology obtained calcination was evidenced SEM analysis. Also, tendency agglomerate as micron- sub-micron-sized particles...

In recent years, nanomedicine focused on the development of functional AuNPs for biomedical imaging, attributed to intriguing optical properties these nanoparticles, which are discussed in this review. Moreover, presented most important vivo diagnostic techniques have benefited from engineered AuNPs, such as computed tomography and photothermal/photoacoustic imaging. Another advantage related nanoparticles refers their excellent performance studies clinical trials. Also, side effects...

Abstract Besides other lignocellulose waste resulting from agriculture, spent mushroom substrate is a major concern due to the high amount of waste, usually improper disposed. Also, sand-based mortars require use this non-renewable and exhaustive aggregate problems environment protection arise. The study aims analyze possibilities sand replacement in composition with grounded substrate. ratio between cement studied compositions was 1:1, 1:2, 1:4. hardened are analyzed terms colorimetric...

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessExtended Abstract Chemical Synthesis of Multi-Walled Carbon Nanotubes and Their Functionalization with Carboxylated Groups † by Madalina Elena David 1,2,*, Rodica-Mariana Ion 1,2, Ramona Marina Grigorescu 1, Lorena Iancu Andrei Raluca Somoghi Adriana Nicoleta Frone 1 Maria Stirbescu 3 National Institute for Research & Development in Chemistry...

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessExtended Abstract Carbonated Hydroxyapatite Substituted with Magnesium for Stone Consolidation † by Lorena Iancu 1,2,*, Rodica-Mariana Ion 1,2, Ramona Marina Grigorescu 1, Paul Niculae Ghioca Bogdan Spurcaciu Madalina Elena David Andrei Marius Ghiurea Raluca Maria Stirbescu 3 and Alin Bucurica 1 National Institute Research & Development in Chemistry...

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessExtended Abstract Investigation of Chromatic Parameters Some Samples from Constanta Casino † by Ionut Marina 1,*, Rodica-Mariana Ion 1,2, Madalina Elena David Lorena Iancu 1,2 and Ramona Grigorescu 2 1 Valahia University Târgoviste, Doctoral School Materials Engineering, 13 Aleea Sinaia, 130105, Romania National Institute for Research & Development in...

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessAbstract Surface Consolidation of Model Stone Samples with Carbonated Hydroxyapatite † by Lorena Iancu 1,2,*, Rodica-Mariana Ion 1,2, Ramona Marina Grigorescu 1, Paul Niculae Ghioca Madalina Elena David Andrei George Ionut Radu Mircea Ioan Filipescu Raluca Ioana Suica-Bunghez Cristian Andi Nicolae Somoghi Bogdan Trica 1 and Sofia Teodorescu 3 National...

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessAbstract Photocatalytic Degradation of Direct Orange Dye under Solar Light † by Madalina Elena David 1,2,*, Rodica-Mariana Ion 1,2, Lorena Iancu Ramona Marina Grigorescu 1, Andrei George Ionut Radu Mircea Ioan Filipescu Alexandrina Nuta 1 and Ana-Alexandra Sorescu National Institute for Research & Development in Chemistry Petrochemistry – ICECHIM...

Open AccessAbstract Hybrid Materials Based on Multi-Walled Carbon Nanotubes and TiO2 Nanoparticles with Antimicrobial Properties † by Madalina Elena David 1,2,*, Rodica Mariana Ion 1,2, Lorena Iancu 1, Ramona Marina Grigorescu Alina Maria Holban 3, Raluca Somoghi Adrian Ionut Nicoara 4, Bogdan Spurcaciu 1 Anca Irina Gheboianu 5 National Institute for Research Development in Chemistry Petrochemistry—ICECHIM, 060021 Bucharest, Romania 2 Doctoral School of Engineering Department, Valahia...

Abstract The aim of the paper consist in synthesis double substituted carbonated hydroxyapatite using Zn 2+ and Mg ions comparison with previous obtained Sr-Zn-CHAp. Fourier transform infrared spectroscopy, X-ray diffraction, environmental scanning electron microscope (ESEM) coupled EDS is used to highlight presence metallic into apatite structure. Both inorganic compounds are tested as consolidants for two types fir wood, young 30-years old samples. consolidation efficiency demonstrated by...

Abstract The aim of the paper consists in assessing protection fir wood samples against UV degradation by using polyacrylates and titanium dioxide as absorber. irradiation was achieved for 648 hours, considered about 2 years weathering. Colorimetric, water absorption, mechanical investigations were performed on before after irradiation. structural changes evidenced FTIR spectroscopy. Small color coated are observed maximum h treatment, with best results obtained specimen covered Paraloid...