Influence of process parameters and scalability of the semi‐batch production of functionalized silver nanoparticles

Nogueira, André Lourenço; Machado, Ricardo Antônio Francisco; Souza, Alan Z. de; Franco, Carlos; Dutra, Gabriel Benedet

doi:10.1002/cjce.22530

Cited by 9 publications

(10 citation statements)

References 69 publications

(211 reference statements)

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“…Chemical engineering applications include waste‐water treatment, dye degradation, characterizing colloidal nanoparticles—silver, gold, and copper—metallic coordination of molybdenum and cobalt, bimetallic mesoporous materials with cobalt and chromium, and composites of graphene oxide and silver nanoparticles …”

Section: Applicationsmentioning

confidence: 99%

“…In chemical engineering applications, it quantifies concentration with calibration curves and Beer‐Lambert's equation, or evaluates shifts in the spectra from nanoparticles colloids to estimate the size distribution and the form of the particles . UV‐vis spectroscopy is one of the most reliable techniques for nanoparticle colloidal analysis even at the industrial scale …”

Section: Applicationsmentioning

confidence: 99%

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Experimental methods in chemical engineering: Ultraviolet visible spectroscopy—UV‐Vis

et al. 2018

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UV-vis spectroscopy is an inexpensive, simple, flexible, non-destructive, analytical method appropriate for a wide class of organic compounds and some inorganic species. UV-vis spectrophotometers measure the absorbance or transmittance of light passing through a medium as a function of the wavelength. Chemical engineers apply it for quantitative analysis, to derive liquid phase reaction kinetics, and to identify the mechanism at the molecular scale. High performance liquid chromatography and ultra-high performance liquid chromatography integrate UV-vis detectors to identify and quantify the concentration of compounds in liquid streams. Combining these techniques with mass spectrometry facilitates identifying all species. UV-vis diffuse reflectance spectroscopy is a variant with enhanced scattering properties that measures the properties of solids and powders. A bibliometric analysis of the 10 000 most cited papers referring to UV-vis (2016 and 2017) groups research in four major clusters: nanoparticles and nanostucutres; photocatalysis and water treatment; crystals, complexes, and derivatives; and Ag and Au nanoparticles biological interaction.

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: Ultraviolet visible spectroscopy—UV‐Vis

et al. 2018

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“…Os grupos funcionais metoxisilano (-Si-O-CH 3 ) presentes na molécula do AES se hidrolisam quando em contato com a água, formando grupos silanol (-Si-OH). Na presença de superfícies ricas em hidroxilas (OH), como é o caso da BNC, estes grupos funcionais formam ligações siloxanas por meio de reações de condensação [15]. Como a prata se liga aos nitrogênios presentes nos grupos funcionais amina (NH 2 e NH) do AES por meio de ligações de coordenação [16], as nanopartículas deste metal nobre acabam sendo incorporadas quimicamente na superfície das membranas de BNC, funcionalizando-as.…”

Section: Síntese E Incorporação Das Npags E Do Ce(no3)3 à Membranaunclassified

Biossíntese e caracterização de nanocelulose bacteriana para engenharia de tecidos

et al. 2018

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RESUMOQueimaduras causam lesões do revestimento epitelial, a partir de um agente externo, podendo variar desde uma pequena bolha flictena até formas mais graves, capazes de desencadear respostas sistêmicas. O uso de curativos contendo substâncias cicatrizantes e antimicrobianas é uma opção para terapia local. Os curativos de nanocelulose bacteriana (BNC) já demonstraram seu grande potencial de aplicação devido às suas propriedades como alto teor de pureza, alto poder de absorção de água e ótima adaptabilidade biológica. A incorporação de metais na membrana de nanocelulose é bastante promissora. Nanopartículas de prata (NPAgs) têm sido objeto de vários estudos devido às suas propriedades antibacterianas; nitrato de cério, Ce(NO 3 ) 3 , por sua vez, aumenta a eficácia no tratamento por apresentar propriedades imunomoduladoras. O objetivo deste trabalho foi sintetizar e caracterizar membranas de nanocelulose bacteriana funcionalizadas com nitrato de cério e nanopartículas de prata visando aplicação no tratamento de pele humana lesionada por queimadura. O comportamento térmico, interações entre a BNC, Ce(NO 3 ) 3 e NPAg, bem como a morfologia, capacidade de retenção de água, reidratação e potencial antimicrobiano foram analisadas por termogravimentria (TGA), microscopia eletrônica de varredura (MEV), análise de conteúdo de capacidade de água, capacidade de reidratação e atividade antimicrobiana. A membrana formada pela incorporação de Ce(NO 3 ) 3 e NPAgs simultaneamente, e submetida ao tratamento térmico, conservou as propriedades térmicas de ambos os materiais, assim como também boa capacidade de reidratação e um potencial de redução microbiana de 98% para Staphylococcus aureus. A análise de MEV apresentou alteração na morfologia, redução de poros e a presença de partículas, o que sugere adequada incorporação dos compostos. Palavras-chave:Antimicrobianos, Nanocelulose bacteriana, Gluconacetobacter hansenii, nanotecnologia. ABSTRACTBurns cause lesions of the epithelial lining, from an external agent, and can range from a small injury to more severe forms, capable of triggering systemic responses. The use of dressings containing healing and antimicrobial substances are options for local therapy. Bacterial nanocellulose (BNC) dressings have already demonstrated their great potential due to their properties such as high purity, high water absorption capacity and optimum biological adaptability. The incorporation of metals in the nanocellulose membrane is quite promising. Silver nanoparticles (AgNPs) have been studied because of their antibacterial properties; cerium nitrate, Ce(NO 3 ) 3 , on the other hand, increases the efficacy of the treatment because of its immunomodulatory properties. The objective of this work was to synthesize and characterize bacterial nanocellulose membranes functionalized with cerium nitrate and silver nanoparticles aiming the treatment of human skin that has been subject to burning injuries. Thermal behavior, interactions between BNC, Ce(NO 3 ) 3 and AgNP, as well as morphology, water retent...

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“…In a previous work, it was demonstrated that 5 ppm of AgNp was enough to produce ABS/PC blend nanocomposites with very good antibacterial properties against S. aureus , E. coli , and Klebsiella pneumoniae . In the present study, bionanocomposite membranes with excellent antibacterial activity against S. aureus were produced by adding only 13 ppm of AgNp.…”

Section: Resultsmentioning

confidence: 99%

“…Hereafter, 10.0 mL of a sodium borohydride solution (reducing agent, purchased from Cinética, Jandira, Brazil, purity >98%) was fed into the reaction media with a volumetric flow of 1.0 mL min −1 . After the feeding of the reducing agent solution, the system was maintained at the same operational conditions (1000 rpm and 20 °C) for 10 min to guarantee the consumption of the chemical reagents . The sodium citrate concentration selected to be used in the experimental runs was 15.0 mmol L −1 .…”

Section: Methodsmentioning

confidence: 99%

PLLA–silver nanoparticles bionanocomposite membranes: Preparation, antibacterial activity, and in vitro hydrolytic degradation assessment

Zanella

Becker

Schneider

et al. 2019

J of Applied Polymer Sci

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Silver nanoparticles (AgNp) were synthesized in aqueous phase and transferred to chloroform using a fatty amine as phase transfer agent. Poly(l‐lactic acid) (PLLA) membranes were prepared using the “functionalized” chloroform. The amount of AgNp in the chloroform was determined by atomic absorption spectroscopy. Thermogravimetric analysis, differential scanning calorimetry, and field emission scanning electron microscopy were used to characterize the membranes. A decrease of the thermal stability of the membranes was observed upon the addition of AgNp; meanwhile, the polymer crystallinity degree increased, making the membranes more fragile and brittle. The in vitro degradation assessments of the membranes in artificial saliva suggested that the time necessary to degrade the PLLA reduced by raising the concentration of the nanostructures. Additionally, the antibacterial assays demonstrated that the addition of only 13 ppm of AgNp were enough to inhibit the formation of biofilm over the bionanocomposite membranes. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47998.

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Influence of process parameters and scalability of the semi‐batch production of functionalized silver nanoparticles

Cited by 9 publications

References 69 publications

Experimental methods in chemical engineering: Ultraviolet visible spectroscopy—UV‐Vis

Experimental methods in chemical engineering: Ultraviolet visible spectroscopy—UV‐Vis

Biossíntese e caracterização de nanocelulose bacteriana para engenharia de tecidos

PLLA–silver nanoparticles bionanocomposite membranes: Preparation, antibacterial activity, and in vitro hydrolytic degradation assessment

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