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Dr. Nechita Petronela
Dunarea de Jos University of Galati, Engineering and Agronomy Faculty of Braila, Romania

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0 Coatings
0 biopolymers and biocomposites
0 antimicrobial coatings
0 Waste and Wastewater treatment processes
0 cellulose fibres

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Journal article
Published: 25 December 2020 in Coatings
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Coatings based on pigment and polymer binders are applied on paper surfaces to improve their surface, optical, and printing properties. Besides the coating composition, the structure and properties of the coated papers are influenced by the coating layer consolidation upon drying. In this study, the influence of drying conditions on the structure and properties of coating layers based on natural pigments (clay) and polymer binders (butadiene acrylonitrile latex) has been analyzed. Using a laboratory rod Mayer device, the coatings were applied as thin layer (about 15–16 g/m2) on the paper surface and samples of coated paper were dried at 20 and 105 °C temperatures. The optical, structural, and water absorption properties of the coating layer were evaluated by the measurement of gloss, opacity, void fraction, light scattering, and contact angle. The obtained results highlighted that both the drying temperature and latex content in the coating color have a synergic effect on the coated paper quality.

ACS Style

Petronela Nechita. The Influence of Drying Conditions of Clay-Based Polymer Coatings on Coated Paper Properties. Coatings 2020, 11, 12 .

AMA Style

Petronela Nechita. The Influence of Drying Conditions of Clay-Based Polymer Coatings on Coated Paper Properties. Coatings. 2020; 11 (1):12.

Chicago/Turabian Style

Petronela Nechita. 2020. "The Influence of Drying Conditions of Clay-Based Polymer Coatings on Coated Paper Properties." Coatings 11, no. 1: 12.

Review
Published: 15 June 2020 in Coatings
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Paper and board show many advantages as packaging materials, but the current technologies employed to obtain adequate barrier properties for food packaging use synthetic polymers coating and lamination with plastic or aluminium foils—treatments which have a negative impact on packaging sustainability, poor recyclability and lack of biodegradability. Recently, biopolymers have attracted increased attention as paper coatings, which can provide new combinations in composite formulas to meet the requirements of food packaging. The number of studies on biopolymers for developing barrier properties of packaging materials is increasing, but only a few of them are addressed to food packaging paper. Polysaccharides are viewed as the main candidates to substitute oil-based polymers in food paper coating, due to their film forming ability, good affinity for paper substrate, appropriate barrier to gases and aroma, and positive effect on mechanical strength. Additionally, these biopolymers are biodegradable, non-toxic and act as a matrix for incorporation additives with specific functionalities for coated paper (i.e., active-antimicrobial properties). This paper presents an overview on the availability and application of polysaccharides from vegetal and marine biomass in coatings for foods packaging paper. The extraction methods, chemical modification and combination routes of these biopolymers in coatings for paper packaging are discussed.

ACS Style

Petronela Nechita; Mirela Roman (Iana-Roman). Review on Polysaccharides Used in Coatings for Food Packaging Papers. Coatings 2020, 10, 566 .

AMA Style

Petronela Nechita, Mirela Roman (Iana-Roman). Review on Polysaccharides Used in Coatings for Food Packaging Papers. Coatings. 2020; 10 (6):566.

Chicago/Turabian Style

Petronela Nechita; Mirela Roman (Iana-Roman). 2020. "Review on Polysaccharides Used in Coatings for Food Packaging Papers." Coatings 10, no. 6: 566.

Journal article
Published: 13 May 2020 in Nordic Pulp & Paper Research Journal
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The work presented in this paper is focussed on study of structure and properties of coating layers based on natural pigments (ground calcium carbonate and clay) and butadiene acrylonitrile latex as binder in correlation with functional properties of the final coated paper. It is quantified the influence of binder content and pigment type on the structural and liquids penetration properties of coating layer. The obtained results confirm that by increasing of binder content in the coating formulations a reduced efficiency of light-scattering and increased roughness for coated surfaces is obtained. At the high binder amounts (over 15 pph), the coating layer porosity is reduced and as result a lower liquids penetration in the coated papers is obtained.

ACS Style

Petronela Nechita. The influence of coating composition on the structural and functional properties of coated paper for packaging applications. Nordic Pulp & Paper Research Journal 2020, 35, 408 -418.

AMA Style

Petronela Nechita. The influence of coating composition on the structural and functional properties of coated paper for packaging applications. Nordic Pulp & Paper Research Journal. 2020; 35 (3):408-418.

Chicago/Turabian Style

Petronela Nechita. 2020. "The influence of coating composition on the structural and functional properties of coated paper for packaging applications." Nordic Pulp & Paper Research Journal 35, no. 3: 408-418.

Book chapter
Published: 04 March 2020 in Generation, Development and Modifications of Natural Fibers
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Knowing the negative impact of plastic materials from agriculture sources on the environmental pollution, in this chapter, some of research activities carried on the utilization of secondary cellulose fibers (from recovered papers and boards) and other lignocellulosic materials on obtaining of sustainable composite materials are presented. The aim was to obtain the (bio)composite materials with applications in manufacturing processes of biodegradable nutritive pots used in the production of vegetable seedlings. The tests were developed on a pilot plant designed to obtain the pots from a mixture of secondary cellulose fibers, red peat, and other additives. These materials were characterized in terms of biodegradability and growth and development of tomatoes and lettuce seedlings. For all the compositional versions studied, the specific indicators of seedlings growth and development have recorded values that allow a normal growth of plants similar to the use of plastic pots or biodegradable pots available on the import market.

ACS Style

Petronela Nechita. Use of Recycled Cellulose Fibers to Obtain Sustainable Products for Bioeconomy Applications. Generation, Development and Modifications of Natural Fibers 2020, 1 .

AMA Style

Petronela Nechita. Use of Recycled Cellulose Fibers to Obtain Sustainable Products for Bioeconomy Applications. Generation, Development and Modifications of Natural Fibers. 2020; ():1.

Chicago/Turabian Style

Petronela Nechita. 2020. "Use of Recycled Cellulose Fibers to Obtain Sustainable Products for Bioeconomy Applications." Generation, Development and Modifications of Natural Fibers , no. : 1.

Journal article
Published: 23 July 2019 in Polymers
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Recent studies have highlighted an innovative way to produce highly porous materials based on cellulose fibers. These studies have focused on the foam-forming process, where the cellulose fibers and other components are mixed with foam. In the authors’ previous research, the foam-formed cellulose materials (FCM) were obtained by mixing a surfactant with cellulose fibers, taken from virgin pulp and recovered papers. In the present paper, the authors performed additional experimental and computational analyses in order to evaluate the sound insulation capabilities of these FCM beyond the initial impedance of tube investigations. The poroacoustics computational methodology parameters—i.e., airflow resistivity, porosity, tortuosity, viscous, and thermal characteristic lengths—were herein evaluated. This analysis was performed using both a theoretical/empirical approach from the specialized literature and an experimental investigation developed by the authors. The computational investigations were conducted in two stages: First, we evaluated the approximation of the experimentally gained normal incidence parameters, in terms of absorption and reflection, respectively, relative to the estimated ones. The second stage of analysis consists of a parametrical estimation of sound insulation characteristics concerning the incidence angle of sound hitting the porous layer. The results presented in this paper are in agreement with the computational experimental results, providing extended soundproof characteristics to the incidence angle of the acoustic field. Further, this study supplies additional information useful for future analyses regarding the influences of random geometry air inclusions into the FCM layer.

ACS Style

Carmen Debeleac; Petronela Nechita; Silviu Nastac. Computational Investigations on Soundproof Applications of Foam-Formed Cellulose Materials. Polymers 2019, 11, 1223 .

AMA Style

Carmen Debeleac, Petronela Nechita, Silviu Nastac. Computational Investigations on Soundproof Applications of Foam-Formed Cellulose Materials. Polymers. 2019; 11 (7):1223.

Chicago/Turabian Style

Carmen Debeleac; Petronela Nechita; Silviu Nastac. 2019. "Computational Investigations on Soundproof Applications of Foam-Formed Cellulose Materials." Polymers 11, no. 7: 1223.

Journal article
Published: 15 December 2018 in The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science
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Due to high efficiency, in terms of effluent quality, the activated sludge treatment is the most common method for removing the biodegradable impurities from industrial and urban wastewaters. Although these engineering systems of biological wastewater treatments increase the rate of biodegradable substances removing, in most cases, these are rarely able to achieve the maximum performances due to the lack of some fast methods to monitor and control the living biomass. In this context, in present paper are described some methods for evaluation of viability and biological activity of activated sludge, as essential parameters for ensuring the performance of biological treatment process. The proposed methods are based on the determination of metabolically active bacteria in activated sludge, using the activity of dehydrogenase enzymes (Triphenyl tetrazolium chloride TTC method) in the biological treatment of wastewaters generated from the paper manufacturing process.

ACS Style

Petronela Nechita; Carmen Mariana Burtea; Vasilica Barbu; Dunarea de Jos"; University of Galati; "Dunarea de Jos" University of Galati. Considerations on Applying Practical Control Methodsin the Biological Treatment of Wastewaters from Paper Manufacturing. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 2018, 41, 29 -34.

AMA Style

Petronela Nechita, Carmen Mariana Burtea, Vasilica Barbu, Dunarea de Jos", University of Galati, "Dunarea de Jos" University of Galati. Considerations on Applying Practical Control Methodsin the Biological Treatment of Wastewaters from Paper Manufacturing. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science. 2018; 41 (4):29-34.

Chicago/Turabian Style

Petronela Nechita; Carmen Mariana Burtea; Vasilica Barbu; Dunarea de Jos"; University of Galati; "Dunarea de Jos" University of Galati. 2018. "Considerations on Applying Practical Control Methodsin the Biological Treatment of Wastewaters from Paper Manufacturing." The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 41, no. 4: 29-34.

Research article
Published: 01 November 2017 in Journal of Thermoplastic Composite Materials
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Due to their advantages (low cost, non-toxic, biodegradable, abundant, low density and very good mechanical properties), the lignocellulosic residues were widely used in the last time as reinforcements in composite materials with applications in the building industry. Besides these wastes, expanded perlite (EP) and natural polymers are promising candidates for the building industry, based on their specific characteristics and economic advantages. In this article, the results are presented regarding the thermal insulation properties of composite materials based on EP and natural polymers (starch polymer matrix reinforced with lignocellulosic wastes). The samples of composite materials were obtained from the laboratory and characterized in terms of the main specific properties of building materials, such as thermal conductivity/resistance, water absorption capacity, apparent density and image analyses by scanning electron microscopy. The obtained results have highlighted the values for thermal conductivity of composite samples between 0.05 and 0.11 (W/mK), similar to those materials currently used in building thermal insulation.

ACS Style

Petronela Nechita; Ştefania Miţa Ionescu. Investigation on the thermal insulation properties of lightweight biocomposites based on lignocellulosic residues and natural polymers. Journal of Thermoplastic Composite Materials 2017, 31, 1497 -1509.

AMA Style

Petronela Nechita, Ştefania Miţa Ionescu. Investigation on the thermal insulation properties of lightweight biocomposites based on lignocellulosic residues and natural polymers. Journal of Thermoplastic Composite Materials. 2017; 31 (11):1497-1509.

Chicago/Turabian Style

Petronela Nechita; Ştefania Miţa Ionescu. 2017. "Investigation on the thermal insulation properties of lightweight biocomposites based on lignocellulosic residues and natural polymers." Journal of Thermoplastic Composite Materials 31, no. 11: 1497-1509.

Review article
Published: 20 June 2017 in Journal of Composite Materials
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Use of foam-formed cellulose composite materials is a viable alternative that provides potential savings in terms of raw materials, energy and water compared with conventional methods for obtaining the fibrous composites. This new innovative manufacturing method leads to obtaining porous materials with low density and low environmental impact, which could replace the petroleum-based products in different industrial application fields like sound control. In this paper is presented a methodology for producing low-density cellulose composite materials in foam media. In this methodology a surfactant is mixed with cellulose fibres (from virgin pulp and recovered papers) at high shear velocity (2000 r/min) to entrain air, dewatered on Buchner funnel under low vacuum and air dried in non-restrained conditions. The obtained composite materials have been tested by sound insulation parameters (sound transmission loss and absorption coefficients) using two experimental impedance tubes with four-microphone configuration and anechoic termination. Three samples of foam-formed cellulose composites and one water-formed composite sample were obtained. Their sound insulation performances were compared with two different commercially available petroleum-based materials currently used in sound insulation applications (i.e. expanded/extruded polystyrene). The experimental results show comparable performances between foam-formed cellulose composites and polystyrene-based samples, but in terms of the environmental impact, these materials can be an appropriate green alternative which can cut the costs of recycling process.

ACS Style

P Nechita; S Năstac. Foam-formed cellulose composite materials with potential applications in sound insulation. Journal of Composite Materials 2017, 52, 747 -754.

AMA Style

P Nechita, S Năstac. Foam-formed cellulose composite materials with potential applications in sound insulation. Journal of Composite Materials. 2017; 52 (6):747-754.

Chicago/Turabian Style

P Nechita; S Năstac. 2017. "Foam-formed cellulose composite materials with potential applications in sound insulation." Journal of Composite Materials 52, no. 6: 747-754.