Aurelia Cristina Nechifor

Aurelia Cristina Nechifor
Polytechnic University of Bucharest | UPB · Department of Analytical Chemistry and Instrumental Analysis

PhD Chemical Engineering

About

165
Publications
46,212
Reads
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1,003
Citations
Introduction
Research interests: Cean technologies; Membrane separation techniques; Medical applications of nanoparticles; Magnetic nanoparticles and ferrofluids; Biosorption. Disciplines: Analytical chemistry and instrumental analysis; Magnetic separations; Chemical speciation.
Additional affiliations
March 2015 - present
Polytechnic University of Bucharest
Position
  • Professor
Description
  • Membrane preparation and characterization, Magnetic materials, nano-particles, Membrane processes, Environmental applications of membranes and membrane processes, Analytical separation
June 2010 - March 2013
National Institute for Research and Development in Microtechnologies - IMT Bucharest
Position
  • PostDoc Position
Description
  • Micro-systems and applications, Magnetic nano-particles and applications
March 2006 - February 2007
Polytechnic University of Bucharest
Position
  • PostDoc Position
Description
  • composite membrane materials, composite membranes, membranes and membrane processes

Publications

Publications (165)
Article
The paper presents a set of three interconnected case studies on the depuration of food processing wastewaters by using aeration & ozonation and two types of hollow-fiber membrane bioreactor (MBR) approaches. A secondary and more extensive objective derived from the first one is to draw a clearer, broader frame on the variation of physical-chemical...
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This paper presents the synthesis of new nanostructured composite membranes based on polysulfone and different types of carbon nanotubes (single wall SWNTor multi wall DWNT). The membranes were obtained from different solvents (N, N'-dimethylformamide, aniline), with both types of nanotubes dispersed in polymer mass and coualently bonded to the pol...
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Recently, membrane technology started to be considered the leading technology in the field of separation techniques. In the present paper, Polysulfone-Sulfonate Polyetheretherketone-Polyaniline-Carbon Nanotube (PSF-SPEEK-PANI-CNT) nanocomposite membrane, has been obtained by phase inversion via immersionprecipitation from a dispersion of the SPEEK-...
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The obtaining of nanofunctionalized membranes is one of the newer trends for enhancing the performances of the membrane processes. In this paper, the results concerning the synthesis of new polymeric-carbon nanotube composite membranes based on polysulfone with different types of nanotubes, single wall (SWNT) and double wall (DWNT), are shown with...
Article
Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@ICPTES-cysteine MNPs have been prepared by the deposition of silica onto magnetite nanoparticles via controlled hydrolysis of TEOS. The new formed silica surface has been functionalized by grafting 3-(triethoxysilyl) propyl isocyanate (ICPTES) and, subsequently, by condensation of isocyanate moiety with cysteine. T...
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Background and Objectives: Quarantine, isolation and bed rest associated with COVID-19 22 infection, favored the loss of muscle and bone mass, especially in elderly patients. The current study 23 aims to compare the presence of sarcopenia and osteoporosis in patients with a recent (one month) 24 history of SARS-CoV-2 infection versus the general po...
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The bio-medical benefits of silver ions and 10-undecenoic acid in various chemical-pharmaceutical preparations are indisputable, thus justifying numerous research studies on delayed and/or controlled release. This paper presents the effect of the polymer matrix in the simultaneous release of silver ions and 10-undecenoic acid in an aqueous medium o...
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The incidence of the no-reflow (NR) phenomenon varies depending on the diagnostic criteria used. If only just the angiographic criteria are considered (i.e., a degree of thrombolysis in myocardial infarction ≤2), it will be found that the incidence of NR is quite low; on the other hand, when the myocardial NR is taken into account (i.e., a decrease...
Article
The ever-increasing frequency of metabolic syndrome (MetS) is still a major challenge of the public health care system, worldwide. In recent years, researchers have been drawn to the uncommon (at first look) link between skin illnesses and MetS. Because of the pro-inflammatory mechanisms and insulin resistance (IR) that are upregulated in metabolic...
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Regardless of the type of liquid membrane (LM) (Bulk Liquid Membranes (BLM), Supported Liquid Membranes (SLM) or Emulsion Liquid Membranes (ELM)), transport and separation of chemical species are conditioned by the operational (OP) and constructive design parameters (DP) of the permeation module. In the present study, the pH of the aqueous source p...
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Osteoarthritis (OA) is a common, frequently met degenerative disease, that generates pain and decreasing functionality; risk of suffering from this disorder increases with ageing. Being a complex disease, treatment is often difficult due to complications. Knee OA therapy demands a strategy that specialists agree with in considering the clinical sym...
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Diabetes exacerbates the progression of atherosclerosis and is associated with increased risk of developing acute coronary syndrome (ACS). Approximatively 25-30% of patients admitted for ACS have diabetes. ACS occurs earlier in diabetics and is associated with increased mortality and a higher risk of recurrent ischemic events. An increased proinfla...
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Liquid membranes usually have three main constructive variants: bulk liquid membranes (BLM), supported liquid membranes (SLM) and emulsion liquid membranes (ELM). Designing hybrid variants is very topical, with the main purpose of increasing the flow of substance through the membrane but also of improving the selectivity. This paper presents the op...
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Coronavirus disease 2019 (COVID-19) represents an unmet clinical need, due to a high mortality rate, rapid mutation rate in the virus, increased chances of reinfection, lack of effectiveness of repurposed drugs and economic damage. COVID-19 pandemic has created an urgent need for effective molecules. Clinically proven efficacy and safety profiles h...
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In the field of orthopedic surgery, cemented total knee arthroplasty (TKA) is considered to be one of the gold standards. However, there are categories of patients (i.e., obese and morbidly obese patients, younger than 65 years old) among whom cemented TKA has however a high failure rate. Moreover, the frequency of using uncemented TKA is increasin...
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The recovery of osmium from residual osmium tetroxide (OsO4) is a necessity imposed by its high toxicity, but also by the technical-economic value of metallic osmium. An elegant and extremely useful method is the recovery of osmium as a membrane catalytic material, in the form of nanoparticles obtained on a polymeric support. The subject of the pre...
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Transport and Separation of the Silver Ion with n-decanol Liquid Membranes Based on 10-undecylenic Acid, 10-undecen-1-ol and Magnetic Nanoparticles. Membranes 2021, 11, 936. https://doi. Abstract: This paper presents a transport and recovery of silver ions through bulk liquid membranes based on n-decanol using as carriers 10-undecylenic acid and 10...
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Composite membranes play a very important role in the separation, concentration, and purification processes, but especially in membrane reactors and membrane bioreactors. The development of composite membranes has gained momentum especially through the involvement of various nanoparticles, polymeric, oxide, or metal, that have contributed to increa...
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Extensive experimental, clinical, and epidemiological evidence has explained and proven that products of natural origin are significantly important in preventing and/or ameliorating various disorders, including different types of cancer that researchers are extremely focused on. Among these studies on natural active substances, one can distinguish...
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Membranes are associated with the efficient processes of separation, concentration and purification, but a very important aspect of them is the realization of a reaction process simultaneously with the separation process. From a practical point of view, chemical reactions have been introduced in most membrane systems: with on-liquid membranes, with...
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Chemical composition, antioxidant capacity, and antimicrobial activity of lavender es-25 sential oils (LEOs) extracted from three different varieties of Lavandula angustifolia Mill. (1-26 Moldoveanca 4, 2-Vis Magic, and 3-Alba 7) have been determined. These plants previously pa-27 tented in the Republic of Moldova were cultivated in organic agricul...
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Progressive degeneration of neurons and aggravation of dopaminergic neurons in the substantia nigra pars compacta results in the loss of dopamine in the brain of Parkinson's disease (PD) patients. Numerous therapies, exhibiting transient efficacy have been developed; however, they are mostly accompanied by side effects and limited reliability, ther...
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The membranes and membrane processes have succeeded in the transition from major technological and biomedical applications to domestic applications: water recycling in washing machines, recycling of used cooking oil, recovery of gasoline vapors in the pumping stations or enrichment of air with oxygen. In this paper, the neutralization of condensati...
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The separation, concentration and transport of the amino acids through membranes have been continuously developed due to the multitude of interest amino acids of interest and the sources from which they must be recovered. At the same time, the types of membranes used in the separa-tion of the amino acids are the most diverse: liquids, ion exchanger...
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The values of hematological and coagulation biomarkers were evaluated as predictors of 23 in hospital mortality and complications, in patients with acute coronary syndromes (ACS). This ret- 24 rospective observational study enroled 936 ACS subjects admitted to the Clinical Emergency Hos- 25 pital of Oradea, Romania, between January-December 2019. H...
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The present study introduces the process performances of nitrophenols pertraction using new liquid supported membranes under the action of a magnetic field. The membrane system is based on the dispersion of silver-iron oxide nanoparticles in n-alcohols supported on hollow mi-croporous polypropylene fibers. The iron oxide-silver nanoparticles are ob...
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The unpleasant odor that appears in the industrial and adjacent waste processing areas is a permanent concern for the protection of the environment and, especially, for the quality of life. Among the many variants for removing substance traces, which give an unpleasant smell to the air, membrane-based methods or techniques are viable options. Their...
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Metabolic syndrome (MetS) and type 2 diabetes mellitus (T2DM) are diseases that can be influenced by the structure of gut microbiota, whose improvement is often neglected in metabolic pathology. This review highlights the following aspects: the pathogenesis, developed as a consequence of altered gut microbiota, that negatively influences metabolic...
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Stability of nanofluids is one of the most important factors to ensure the most benefit of the properties of nanoparticles. Zinc oxide was used in the research with concentration between (0.2-1) wt. % with ethylene glycol base fluid. The stability of ZnO nanofluid was enhanced by adding two types of surfactants Tx-100 and Gum Arabic with concentrat...
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The massive scale of industrial development has resulted in environmental pollution in general and water contamination in particular. It is important at the present time to treat water for the purpose of eliminating or reducing pollutants, especially toxic pollutants, such as phenol compounds. In this study, zeolite (4A) was prepared firstly from t...
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Caseinase is involved in the breakdown of milk protein casein and converts casein into smaller simple sugars which can be easily utilized by the body for the production of ATP and Fat. Casein can be an instant energy source to the body and involves in muscle building. Caseinase enzyme can be extensively used at the industrial scale for Milk, Textil...
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The preparation of membranes from polymer solutions by the phase inversion method, the immersion-precipitation technique has proved since the beginning of obtaining technological membranes the most versatile and simple possibility to create polymeric membrane nanostructures. Classically, the phase inversion technique involves four essential steps:...
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A sensitive electrochemical method was used for the determination of the total phenolic content and antioxidant activity of Echinacea purpurea extracts. In this study, 3 glassy carbon electrodes (GCE) were used: one unmodified and the other two newly manufactured glassy carbon electrodes modified with carbon nanotubes (CNTs) and chitosan (CS) in di...
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The present study aimed to assess the eighteen month follow-up patient-centered outcomes of a simple and predictable protocol for 3D-printed functional complete dentures manufactured using an improved poly(methyl methacrylate) (PMMA)-nanoTiO2. A detailed morphological and structural characterization of the PMMA-TiO2 nanocomposite, using SEM, EDX, X...
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The present study aimed to assess the eighteen month follow-up patient-centered outcomes of a simple and predictable protocol for 3D-printed functional complete dentures manufactured using an improved poly(methyl methacrylate) (PMMA)-nanoTiO2. A detailed morphological and structural characterization of the PMMA-TiO2 nanocomposite, using SEM, EDX, X...
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There is an increased interest in recycling valuable waste materials for usage in procedures with high added values. Silica microparticles are involved in the processes of catalysis, separation, immobilization of complexants, biologically active compounds, and different nanospecies, responding to restrictive requirements for selectivity of various...
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Bio-based, environmentally benign production of commodity chemicals such as 1,4-butanediol (BDO) from renewable feedstocks is highly challenging due to the lack of natural synthesis pathways. Herein, we present a systematic model-driven evaluation of the production potential for Escherichia coli to produce BDO from renewable carbohydrates (glucose,...
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Bio-based, environmentally benign production of commodity chemicals such as 1,4-butanediol (BDO) from renewable feedstocks is highly challenging due to the lack of natural synthesis pathways. Herein, we present a systematic model-driven evaluation of the production potential for Escherichia coli to produce BDO from renewable carbohydrates (glucose,...
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The bio-based synthesis of 1,4-butanediol (BDO), a key compound in many industries, has recently been achieved in Escherichia coli, however the yield even in glucose was far below the theoretical maximum. Furthermore, the impact of the BDO pathway on cell metabolism is yet to be discovered. The main objective of this study was to in silico improve...
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The study describes a method for the determination of ascorbic acid (AA) with the technique of high performance liquid chromatography with UV detection (UV-HPLC) modified for routine analysis of agricultural products. For successful use of the method in the test laboratory practice, the reliability of using this method has been confirmed by validat...
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The polymer-inorganic nanoparticles composite membranes are the latest solutions for multiple physicochemical resistance and selectivity requirements of membrane processes. This paper presents the production of polysulfone-silica microfiber grafted with titanium dioxide nanoparticles (PSf-SiO2-TiO2) composite membranes. Silica microfiber of length...
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A complex formulation for topical treatment, consisting of melatonin, hyaluronic acid, tetracycline, and metronidazole mixture is proposed as periodontal disease adjunctive treatment. In order to follow the structural aspects of the active mixture, spectrophotometric methods: UV-Vis and fluorescence, have been applied. The results obtained complete...
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The current study aimed to investigate the elimination of dyes from sewerage, using microfiltration membrane mechanism. Three dyes were applied, acid yellow-23, disperse blue-79 and acid orange-7. Experiments were performed with feed concentration (40-120) ppm, feed flow rate (25-65) l/h and time (0.25-1.5) h. The membrane used ceramic membrane, co...
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Eggshells was used as a natural adsorbent to remove direct blue(DB) dye from aqueous solution and investigating the four factors that affect the adsorption of DB dye ; amount of eggshell rang (0.1-1g), initial concentration (10-60 mg/L), time (5-45 min.) and pH (3-11). Central Composition Design with four variables and five levels coupled with resp...
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The ionic conductivity, ionic viscosity as intrinsic properties of PMMA-TiO 2 nanocomposites were investigated. The PMMA doped with 0.4% TiO 2 nanoparticles has been used for 3D printed dentures manufacturing. A structural characterization using microcomputer tomography method was performed on 3D printed dentures, which have been permanently used f...
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The aim of the present paper was to highlight the individual effects of melatonin (MEL) and hyaluronic acid (HA) on periodontal structures and repair mechanism and to investigate a possible synergic effect and if each component of the proposed mixture (MEL-HA) would maintain their specific characteristics, when using booth active principles, for a...
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Co+2, Ni+2 , Cu+2 as well Zn+2 compounds mixed ligand from 8-hydroxyquinoline(8-HQ) also tributylphosphine (PBu3) have been attended at aquatic ethyl alcohol for (1:2:2) (M:8-HQ:PBu3). Produced complexes have been identified by utilizing atomic absorption flame, FT-IR as well UV-Vis spectrum manners also magnetic susceptibility as well as conductiv...