scholarly journals Multifunctional Nanocomposite Cellulose Fibers Doped in Situ with Silver Nanoparticles

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 562 ◽  
Author(s):  
Olga Rac-Rumijowska ◽  
Irena Maliszewska ◽  
Marta Fiedot-Toboła ◽  
Iwona Karbownik ◽  
Helena Teterycz
Keyword(s):  
Silver Nanoparticles ◽  
Combustion Process ◽  
Antibacterial Properties ◽  
Cellulose Fibers ◽  
Sem Images ◽  
Linear Resistance ◽  
Stage Combustion ◽  
Tg Studies ◽  
Environmentally Friendly Method

This paper presents a method for the preparation of nanocomposite cellulose fibers doped with silver nanoparticles (AgNPs), as well as the effect of silver nanoparticles on the structure and properties of fibers. The fibers were obtained by an environmentally friendly method using N-Methylmorpholine N-oxide (NMMO) as a solvent, in a non-polluting closed system. Doping with silver nanoparticles was carried out as a direct (in situ) reduction of Ag+ ions in the presence of a stabilizing agent during the preparation of the spinning solution. SEM images of the surface and cross section of the fibers showed that the distribution of nanoparticles in the fibers’ volume was uniform. The fibers exhibited very good antibacterial properties in relation to Staphylococcus aureus, Escherichia coli, Acinetobacter baumannii, and Candida albicans. Flammability analysis showed that the fibers were subjected to a one-stage combustion process and that the silver nanoparticles reduced the heat release rate (HRR) of the fibers by 36%. TG studies showed that the modification of cellulose fibers with silver nanoparticles promoted the formation of mill scale in the combustion of fibers, which was directly related to the reduction of flammability. Tests of the electrical properties showed that the linear resistance of cellulose fibers containing 3 wt % silver was 108 Ω/cm.

scholarly journals Photocatalytic activity and antibacterial properties of linen fabric using reduced graphene oxide/silver nanocomposite

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41600-41611
Author(s):  
A. Farouk ◽  
S. El-Sayed Saeed ◽  
S. Sharaf ◽  
M. M. Abd El-Hady
Keyword(s):  
Silver Nanoparticles ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Antibacterial Properties ◽  
Reduced Graphene ◽  
Silver Nanocomposite ◽  
Linen Fabric

Silver nanoparticles were in situ prepared on the surface of linen fabric coated by graphene oxide (GO).

Antibacterial properties and cytocompatibility of bio-based nanostructured carbon aerogels derived from silver nanoparticles deposited onto bacterial cellulose

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97467-97476 ◽  
Author(s):  
Ning Yan ◽  
Yabin Zhou ◽  
Yudong Zheng ◽  
Shuang Qiao ◽  
Qun Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Controlled Release ◽  
Bacterial Cellulose ◽  
Antibacterial Properties ◽  
Carbon Aerogels ◽  
Nanostructured Carbon

p-BC/AgNP carbon aerogels with excellent reabsorption capacities and mechanical properties were prepared by in situ reduction and carbonization. The aerogels had better antibacterial behavior and biocompatibility due to their slow controlled release of silver.

Catechol End-Functionalized Polysarcosine for In-situ Synthesis and Stabilization of Silver Nanoparticles

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1113-1120
Author(s):  
Hailemariam Gebru ◽  
Zhenjiang Li
Keyword(s):  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
In Situ Synthesis ◽  
High Concentration ◽  
Ag Nps ◽  
Sem Images ◽  
Stabilizing Agents ◽  
H Nmr ◽  
Dopamine Hydrochloride

ABSTRACTFunctional polymers were previously employed to minimize the susceptibility of metallic nanoparticles (MNPs) for aggregation. Herein, we intended to conjugate catechol moiety into the polymer chain end considering its anchoring ability to virtually most surfaces. Accordingly, catechol end-functionalized polysarcosine (cat-PSar) was successfully prepared from the ring-opening polymerization (ROP) of sarcosine N-carboxyanhydrides (Sar-NCA) using dopamine hydrochloride initiator. ROP of Sar-NCA was carried out at different monomer to initiator feed ratios. The molecular structure of cat-PSar was confirmed by 1H NMR and MALDITOF. Afterward, the obtained catechol functionalized polymer was used for in-situ synthesis and stabilization of silver nanoparticles (Ag-NPs) in aqueous solution. The observed characteristic absorption peak at λmax of 415 nm indicates the formation of Ag-NPs. Scanning electron microscope (SEM) images also elucidate the formation of Ag-NPs with the relatively small sizes of the nanocomposite at a high concentration of silver nitrate. Hence, biomimetic polymers could play a dual role as reducing and stabilizing agents in the preparation of monodispersed MNPs.

scholarly journals In Situ and Ex Situ Designed Hydroxyapatite: Bacterial Cellulose Materials with Biomedical Applications

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4793
Author(s):  
Adrian Ionut Nicoara ◽  
Alexandra Elena Stoica ◽  
Denisa-Ionela Ene ◽  
Bogdan Stefan Vasile ◽  
Alina Maria Holban ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Composite Materials ◽  
Bacterial Cellulose ◽  
Antibacterial Properties ◽  
Antimicrobial Effect ◽  
Absorption Capacity ◽  
Coprecipitation Method ◽  
Ex Situ ◽  
Degradation Rates

Hydroxyapatite (HAp) and bacterial cellulose (BC) composite materials represent a promising approach for tissue engineering due to their excellent biocompatibility and bioactivity. This paper presents the synthesis and characterization of two types of materials based on HAp and BC, with antibacterial properties provided by silver nanoparticles (AgNPs). The composite materials were obtained following two routes: (1) HAp was obtained in situ directly in the BC matrix containing different amounts of AgNPs by the coprecipitation method, and (2) HAp was first obtained separately using the coprecipitation method, then combined with BC containing different amounts of AgNPs by ultrasound exposure. The obtained materials were characterized by means of XRD, SEM, and FT-IR, while their antimicrobial effect was evaluated against Gram-negative bacteria (Escherichia coli), Gram-positive bacteria (Staphylococcus aureus), and yeast (Candida albicans). The results demonstrated that the obtained composite materials were characterized by a homogenous porous structure and high water absorption capacity (more than 1000% w/w). These materials also possessed low degradation rates (<5% in simulated body fluid (SBF) at 37 °C) and considerable antimicrobial effect due to silver nanoparticles (10–70 nm) embedded in the polymer matrix. These properties could be finetuned by adjusting the content of AgNPs and the synthesis route. The samples prepared using the in situ route had a wider porosity range and better homogeneity.

Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films

Holzforschung ◽  
2020 ◽  
Vol 74 (5) ◽  
pp. 523-528 ◽  
Author(s):  
Li Fan ◽  
Hui Zhang ◽  
Mengxi Gao ◽  
Meng Zhang ◽  
Pengtao Liu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Cellulose Nanocrystals ◽  
Food Packaging ◽  
Moisture Absorption ◽  
Antibacterial Properties ◽  
Nanocomposite Films ◽  
Hydroxyl Groups ◽  
In Situ Preparation ◽  
The Many

AbstractWith the increasing application of polyvinyl alcohol (PVA) films in the field of food packaging, it is important to improve its mechanical and antibacterial properties. This paper focuses on the preparation of PVA nanocomposite films and how their properties are affected by a silver-loaded nanocellulose solution. Cellulose nanocrystals (CNCs) were used as both the carrier and the dispersant of silver nanoparticles (AgNPs) prepared using glucose as the reducing agent. Ag+ was stabilized by the many hydroxyl groups located in the CNCs, and then the Ag+ was reduced to AgNPs in situ. After addition of silver-loaded nanocellulose, the tensile strength of the CNC-PVA-AgNP films increased from 47 MPa to 73 MPa, and the nanocomposite films displayed reduced moisture absorption and good antibacterial properties.

scholarly journals Gentamicin-loaded silk/nanosilver composite scaffolds for MRSA-induced chronic osteomyelitis

2019 ◽  
Vol 6 (5) ◽  
pp. 182102 ◽  
Author(s):  
Peng Zhang ◽  
Jianzhong Qin ◽  
Bo Zhang ◽  
Yi Zheng ◽  
Lingyan Yang ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Formic Acid ◽  
Chronic Osteomyelitis ◽  
Antibacterial Properties ◽  
Bone Defects ◽  
Composite Scaffolds ◽  
Effective Inhibition

Methicillin-resistant Staphylococcus aureus (MRSA) often induces chronic osteomyelitis and then bone defects. Here, gentamicin-loaded silk/nanosilver composite scaffolds were developed to treat MRSA-induced chronic osteomyelitis. AgNO 3 was reduced with silk as a reducing agent in formic acid, forming silver nanoparticles in situ that were distributed uniformly in the composite scaffolds. Superior antibacterial properties against MRSA were achieved for the composite scaffolds, without the compromise of osteogenesis capacity. Then gentamicin was loaded on the scaffolds for better treatment of osteomyelitis. In vivo results showed effective inhibition of the growth of MRSA bacteria, confirming the promising future in the treatment of chronic osteomyelitis.

scholarly journals Enhancement of antibacterial properties of various polymers functionalized with silver nanoparticles

2019 ◽  
Vol 10 (3) ◽  
pp. 5592-5598
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticles ◽  
Surface Morphology ◽  
Bacillus Cereus ◽  
Water Absorption ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Color Transformation ◽  
Green Procedure

A new green deposition of silver nanoparticles (AgNPs) on polymers was proposed in this work. In-situ synthesis of AgNPs on polymers was achieved via a green procedure using natural reducing agents, which are Ageratum conyzoidez and Mikania micrantha. Several characterizations of the treated polymers such as color transformation, surface morphology, elemental contents, and water absorption were comprehensively evaluated. For the application, the treated polymers were then tested against waterborne bacteria, which are Escherichia coli and Bacillus cereus. Rapid deposition of AgNPs via the presently biological method can be successfully achieved as observed via surface morphology analysis and energy dispersive X-ray investigation. Water absorption capabilities of the polymers can be decreased after attaching with AgNPs, which can also probably contribute to the enhancement of their antibacterial activities. This study observed that the treated polymers showed excellent antibacterial activities against Escherichia coli and Bacillus cereus. The findings of this study are useful in designing water purifiers to disinfect contaminated water.

scholarly journals Effect of Ag nanoparticles on R6G laser dye hosted by PMMA polymerized by plasma jet

2019 ◽  
Vol 14 (29) ◽  
pp. 27-36
Author(s):  
Hammad R. Humud
Keyword(s):  
Thin Films ◽  
Silver Nanoparticles ◽  
Laser Dye ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Visible Absorption ◽  
Interferometric Method ◽  
Glass Substrates ◽  
Afm Analysis

This work aim to prepare Ag/R6G/PMMA nanocomposite thinfilms by In-situ plasma polymerization and study the changes in theoptical properties of fluorophore due to the presence of Agnanoparticles structures in the vicinity of the R6G laser dye. Theconcentrations of R6G dye/MMA used are: 10-4M solutions wereprepared by dissolving the required quantity of the R6G dye inMMAMonomer. Then Silver nanoparticles with 50 average particlessize were mixed with MMAmonomer with concentration of 0.3, 0.5,0.7wt% to get R6G silver/MMA in liquid phase. The films weredeposited on glass substrates by dielectric barrier discharge plasmajet. The Ag/R6G/PMMA nanocomposite thin films werecharacterization by UV-Visible absorption spectra by using a doublebeam UV-Vis-NIR Spectrophotometer and fluorescenceSpectrophotometer. The thin films surface morphological analysis iscarried out by employing an AFM and SEM. the structure analysisare achieved by X-ray diffraction. The thickness of the films wasmeasured by optical interferometric method. AFM analysis showsthat the surface roughness of plasma polymerized pure PMMA thinfilms was 2.7 nm and for (10-4 R6G + 0.7wt% Ag)Ag/R6G/PMMAthin films was 4.16 nm. The SEM images were indicates that Agnanoparticles (NPs) disperse in the PMMA matrix with uniformdistribution and formed mostly spherical NPs and slightlyagglomerate. Also the silver nanoparticles with 0.7wt%concentration enhances the absorption process by 2.3 times and thefluorescence by 1.7 times. it can be conclude, that the addition of lowconcentrations of silver nanoparticles to the PMMA/ R6G matrix waschanging the optical properties of the prepared nanocomposite thinfilms.

scholarly journals In Situ Reduction of Silver Nanoparticles on the Plasma-Induced Chitosan Grafted Polylactic Acid Nonwoven Fabrics for Improvement of Antibacterial Activity

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1517
Author(s):  
Yu Ren ◽  
Tingyue Fan ◽  
Xiaona Wang ◽  
Yongyin Guan ◽  
Long Zhou ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Polylactic Acid ◽  
Antibacterial Properties ◽  
In Situ Reduction ◽  
Ag Nps ◽  
X Ray ◽  
Nonwoven Fabrics ◽  
Uniform Dispersion

An eco-friendly approach for improvement of antibacterial properties of polylactic acid (PLA) nonwoven fabrics was obtained by in situ reduction of silver nanoparticles (Ag NPs) on dielectric barrier discharge (DBD) plasma-induced chitosan grafted (DBD-CS-Ag NPs) PLA nonwoven fabrics. The surface morphology, surface element composition and the chemical state of silver of the PLA surfaces after the treatment were evaluated through scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. The antibacterial activity of DBD-CS-Ag NPs treated PLA against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) was tested. The uniform dispersion of silver nanoparticles on the DBD-CS-Ag NPs treated PLA surface were confirmed by SEM images. The results of XPS and XRD showed that the concentration of silver element on the surface of PLA nonwoven fabrics was significantly improved after DBD-CS-Ag NPs treatment. The DBD-CS-Ag NPs treated PLA nonwoven fabrics also exhibited excellent antibacterial properties.

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