Synthesis of antibacterial polyurethane film and its properties

AbstractPolyurethane (PU) is a polymer widely used in the biomedical field with excellent mechanical properties and good biocompatibility. However, it usually exhibits poor antibacterial properties for practical applications. Efforts are needed to improve the antibacterial activities of PU films for broader application prospect and added application values. In the present work, two PU films, TDI-P(E-co-T) and TDI-N-100-P(E-co-T), were prepared. Silver nanoparticles (AgNPs) were composited into the TDI-N-100-P(E-co-T) film for better mechanical properties and antibacterial activities, and resultant PU/AgNPs composite film was systematically characterized and studied. The as-prepared PU/AgNPs composite film exhibits much better antibacterial properties than the traditional PU membrane, exhibiting broader application prospect.

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Mechanically Robust Flexible Multilayer Aramid Nanofibers and MXene Film for High-Performance Electromagnetic Interference Shielding and Thermal Insulation

Nanomaterials ◽

10.3390/nano11113041 ◽

2021 ◽

Vol 11 (11) ◽

pp. 3041

Author(s):

Jun Zhou ◽

Junsheng Yu ◽

Dongyu Bai ◽

Huili Liu ◽

Lu Li

Keyword(s):

Mechanical Properties ◽

Composite Film ◽

Electromagnetic Interference ◽

Multilayer Structure ◽

High Performance ◽

Composite Films ◽

Next Generation ◽

Shielding Effectiveness ◽

Breaking Strain ◽

Practical Applications

In order to overcome the various defects caused by the limitations of solid metal as a shielding material, the development of electromagnetic shielding materials with flexibility and excellent mechanical properties is of great significance for the next generation of intelligent electronic devices. Here, the aramid nanofiber/Ti3C2Tx MXene (ANF/MXene) composite films with multilayer structure were successfully prepared through a simple alternate vacuum-assisted filtration (AVAF) process. With the intervention of the ANF layer, the multilayer-structure film exhibits excellent mechanical properties. The ANF2/MXene1 composite film exhibits a tensile strength of 177.7 MPa and a breaking strain of 12.6%. In addition, the ANF5/MXene4 composite film with a thickness of only 30 μm exhibits an electromagnetic interference (EMI) shielding efficiency of 37.5 dB and a high EMI-specific shielding effectiveness value accounting for thickness (SSE/t) of 4718 dB·cm2 g−1. Moreover, the composite film was excellent in heat-insulation performance and in avoiding light-to-heat conversion. No burning sensation was produced on the surface of the film with a thickness of only 100 μm at a high temperature of 130 °C. Furthermore, the surface of the film was only mild when touched under simulated sunlight. Therefore, our multilayer-structure film has potential significance in practical applications such as next-generation smart electronic equipment, communications, and military applications.

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Evaluation of Nanocomposite Made of Polylactic Acid and Nanocellulose from Carrot Pomace Modified with Silver Nanoparticles

Polymers ◽

10.3390/polym12040812 ◽

2020 ◽

Vol 12 (4) ◽

pp. 812 ◽

Cited By ~ 1

Author(s):

Monika Szymańska-Chargot ◽

Monika Chylińska ◽

Piotr M. Pieczywek ◽

Anna Walkiewicz ◽

Giorgia Pertile ◽

...

Keyword(s):

Escherichia Coli ◽

Mechanical Properties ◽

Carbon Dioxide ◽

Silver Nanoparticles ◽

Polylactic Acid ◽

Cellulose Nanofibrils ◽

Antibacterial Properties ◽

Young Modulus ◽

Transmission Rates ◽

Degradation Temperature

In this research, it was proposed to use carrot cellulose nanofibrils (CCNF) isolated from carrot pomace modified with silver nanoparticles (AgNPs) as a filler of polylactic acid (PLA) composites matrix. The new procedure was based on two steps: first, the preparation of nanocellulose modified with metal nanoparticles, and then the combination with PLA. Two concentrations—0.25 mM and 2 mM—of AgNO3 were used to modify CCNF. Then, PLA was mixed with the filler (CCNF/AgNPs) in two proportions 99:1 and 96:4. The influence of CCNF/AgNPs on mechanical, hydrophilic, thermal, and antibacterial properties of obtained nanocomposites was evaluated. The greatest improvement of mechanical properties was observed for composite containing CCNF with 2 mM of AgNPs, which obtained the lowest Young modulus and highest strain at break. The degradation temperature was lower for PLA with CCNF/AgNPs, but crystallization temperature wasn’t influenced. The addition of CCNF/AgNPs also increased hydrophilicity. The transmission rates of oxygen, nitrogen, and carbon dioxide also increased after the addition of CCNF/AgNPs to PLA. The antibacterial function against Escherichia coli and Bacillus cereus was obtained after the addition of AgNPs but only at the contact surface with the material made, suggesting the lack of migration of nanoparticles from the composite.

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Studies of mechanical properties of electrospun zein/poly(ɛ-caprolactone) composites and antibacterial properties against Listeria monocytogenes strains of zein/poly(ɛ-caprolactone)/ poly(ɛ-lysine) films

Textile Research Journal ◽

10.1177/0040517517732083 ◽

2017 ◽

Vol 88 (24) ◽

pp. 2800-2809 ◽

Cited By ~ 3

Author(s):

Xiyu Hu ◽

Liang liang Yang ◽

Kaijun Wang ◽

Yanli Zixuan Wei ◽

Hongwu Deng ◽

...

Keyword(s):

Mechanical Properties ◽

Listeria Monocytogenes ◽

Wound Dressing ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Mechanical Analysis ◽

Hydrophilic Surface ◽

Packing Materials ◽

Antimicrobial Films ◽

Scanning Electron

Ultra-fine fibers of zein/poly(ɛ-caprolactone) (PCL) composites were prepared by oriented electrospun technology to enhance the toughness and ductility of zein. The mechanical, morphological and thermal properties of fibrous films of zein/PCL were studied by texture analysis and nanoindentation tests, scanning electron microscopy and dynamic mechanical analysis. Wettability of fibrous films was also measured and discussed. The mechanical properties of these fibrous films were significantly improved with the addition of PCL. Research on the antibacterial activities of poly(ɛ-lysine) (EPL) loaded films of zein/PCL/poly(ɛ-lysine) shows that the films could inhibit the growth of Listeria monocytogenes. Films of zein/PCL blend systems with a hydrophilic surface do not dissolve in water and have excellent toughness and ductility. This is very favorable for applications in biodegradable materials, food packing materials, facial masks and as antimicrobial films for wound dressing.

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Interaction of Silver Nanoparticles with Serum Proteins Affects Their Antimicrobial ActivityIn Vivo

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.00152-13 ◽

2013 ◽

Vol 57 (10) ◽

pp. 4945-4955 ◽

Cited By ~ 87

Author(s):

Divya Prakash Gnanadhas ◽

Midhun Ben Thomas ◽

Rony Thomas ◽

Ashok M. Raichur ◽

Dipshikha Chakravortty

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Activity ◽

Serum Albumin ◽

Serum Proteins ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Resistant Bacteria ◽

Human Society ◽

Vis Spectroscopy

ABSTRACTThe emergence of multidrug-resistant bacteria is a global threat for human society. There exist recorded data that silver was used as an antimicrobial agent by the ancient Greeks and Romans during the 8th century. Silver nanoparticles (AgNPs) are of potential interest because of their effective antibacterial and antiviral activities, with minimal cytotoxic effects on the cells. However, very few reports have shown the usage of AgNPs for antibacterial therapyin vivo. In this study, we deciphered the importance of the chosen methods for synthesis and capping of AgNPs for their improved activityin vivo. The interaction of AgNPs with serum albumin has a significant effect on their antibacterial activity. It was observed that uncapped AgNPs exhibited no antibacterial activity in the presence of serum proteins, due to the interaction with bovine serum albumin (BSA), which was confirmed by UV-Vis spectroscopy. However, capped AgNPs [with citrate or poly(vinylpyrrolidone)] exhibited antibacterial properties due to minimized interactions with serum proteins. The damage in the bacterial membrane was assessed by flow cytometry, which also showed that only capped AgNPs exhibited antibacterial properties, even in the presence of BSA. In order to understand thein vivorelevance of the antibacterial activities of different AgNPs, a murine salmonellosis model was used. It was conclusively proved that AgNPs capped with citrate or PVP exhibited significant antibacterial activitiesin vivoagainstSalmonellainfection compared to uncapped AgNPs. These results clearly demonstrate the importance of capping agents and the synthesis method for AgNPs in their use as antimicrobial agents for therapeutic purposes.

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

RSC Advances ◽

10.1039/c5ra15485e ◽

2015 ◽

Vol 5 (118) ◽

pp. 97467-97476 ◽

Cited By ~ 11

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.

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Green Synthesis of Silver Nanoparticles by Extracellular Extracts from Aspergillus japonicus PJ01

Molecules ◽

10.3390/molecules26154479 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4479

Author(s):

Pei-Jun Li ◽

Jiang-Juan Pan ◽

Li-Jun Tao ◽

Xia Li ◽

Dong-Lin Su ◽

...

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Properties ◽

Antimicrobial Properties ◽

Antibacterial Activities ◽

Synthesis Process ◽

Biological Synthesis ◽

X Ray Diffraction ◽

Aspergillus Japonicus ◽

Transmission Electron ◽

Naoh Solution

The present study focuses on the biological synthesis, characterization, and antibacterial activities of silver nanoparticles (AgNPs) using extracellular extracts of Aspergillus japonicus PJ01.The optimal conditions of the synthesis process were: 10 mL of extracellular extracts, 1 mL of AgNO3 (0.8 mol/L), 4 mL of NaOH solution (1.5 mol/L), 30 °C, and a reaction time of 1 min. The characterizations of AgNPs were tested by UV-visible spectrophotometry, zeta potential, scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric (TG) analyses. Fourier transform infrared spectroscopy (FTIR) analysis showed that Ag+ was reduced by the extracellular extracts, which consisted chiefly of soluble proteins and reducing sugars. In this work, AgNO3 concentration played an important role in the physicochemical properties and antibacterial properties of AgNPs. Under the AgNO3 concentration of 0.2 and 0.8 mol/L, the diameters of AgNPs were 3.8 ± 1.1 and 9.1 ± 2.9 nm, respectively. In addition, smaller-sized AgNPs showed higher antimicrobial properties, and the minimum inhibitory concentration (MIC) values against both E. coli and S. aureus were 0.32 mg/mL.

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A Study of 3D-Printable Reinforced Composite Resin: PMMA Modified with Silver Nanoparticles Loaded Cellulose Nanocrystal

Materials ◽

10.3390/ma11122444 ◽

2018 ◽

Vol 11 (12) ◽

pp. 2444 ◽

Cited By ~ 12

Author(s):

Shenggui Chen ◽

Junzhong Yang ◽

Yong-Guang Jia ◽

Bingheng Lu ◽

Li Ren

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Silver Nanoparticles ◽

Composite Resin ◽

Antibacterial Activities ◽

Dental Restoration ◽

Composite Resins ◽

Resin Matrix ◽

Homogeneous Distribution ◽

Reinforced Composite

With the rapid application of light-curing 3D printing technology, the demand for high-performance polymer resins is increasing. Existing light-curable resins often have drawbacks limiting their clinical applications. This study aims to develop a new type of polymethyl methacrylate (PMMA) composite resins with enhanced mechanical properties, high antibacterial activities and excellent biocompatibilities. A series of reinforced composite resins were prepared by mechanically mixing PMMA with modified cellulose nanocrystals (CNCs), which were coated with polydopamine and decorated by silver nanoparticles (AgNPs) via Tollen reaction. The morphology of CNCs-Ag was observed by transmission electron microscopy and the formation of AgNPs on CNCs was confirmed by X-Ray photoelectron spectroscopy analyses. Functional groups in PMMA-CNCs-Ag composites were verified by Fourier Transform infrared spectroscopy (FTIR) spectroscopy. The mechanical assessment and scanning electron microscopy analysis suggested that the evenly distributed CNCs-AgNPs composite effectively improve mechanical properties of PMMA resin. Cytotoxicity assay and antibacterial activity tests indicated excellent biocompatibility and high antibacterial activities. Furthermore, PMMA with CNCs-AgNPs of 0.1 wt.% (PMMA-CNCs-AgNPs-0.1) possessed the most desirable mechanical properties owing to the homogeneous distribution of AgNPs throughout the resin matrix. This specific composite resin can be used as a functional dental restoration material with potential of other medical applications.

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Effect of Silver Nanoparticles on Physicochemical and Antibacterial Properties of Calcium Silicate Cements

Brazilian Dental Journal ◽

10.1590/0103-6440201600689 ◽

2016 ◽

Vol 27 (5) ◽

pp. 508-514 ◽

Cited By ~ 13

Author(s):

Fernando Vazquez-Garcia ◽

◽

Mário Tanomaru-Filho ◽

Gisselle Moraima Chávez-Andrade ◽

Roberta Bosso-Martelo ◽

...

Keyword(s):

Mechanical Properties ◽

Silver Nanoparticles ◽

Compressive Strength ◽

Antibacterial Activity ◽

Calcium Silicate ◽

Setting Time ◽

Antibacterial Properties ◽

Mineral Trioxide Aggregate ◽

Biological Properties ◽

Calcium Silicate Cements

Abstract Mineral trioxide aggregate (MTA) and Portland cement (PC) are calcium silicate cements. They have similar physicochemical, mechanical and biological properties. The addition of zirconium oxide (ZrO2) to PC provides radiopacity. Silver nanoparticles (AgNPs) may improve some properties of cements. The aim of this study was to evaluate the effect of AgNPs on physicochemical/mechanical properties and antibacterial activity of white MTA (WMTA) and PC associated with ZrO2. The following materials were evaluated: WMTA; PC 70% + ZrO2 30%; WMTA+ AgNPs; and PC 70% + ZrO2 30% + AgNPs. The study evaluated radiopacity, setting time, pH, compressive strength and solubility. For radiopacity analysis, radiographs were made alongside an aluminum (Al) step wedge. To evaluate the antibacterial activity, direct contact test was performed on planktonic cells and Enterococcus faecalis biofilm induced on bovine root dentin for 14 days. The experimental periods were 5 and 15 h. Data were obtained as CFU mL-1. The obtained data were submitted to ANOVA and Tukey tests (p<0.05). The addition of AgNPs to WMTA increased the pH, lowered the solubility and the initial and final setting times. The addition of AgNPs to PC/ZrO2 maintained the pH, lowered the solubility, and increased the setting time and compressive strength. The radiopacity of all materials was higher than 4 mmAl. The addition of AgNPs promoted an increase in antibacterial activity for calcium silicate cements and favored the physicochemical and mechanical properties of the materials.

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Enhancement of antibacterial properties of various polymers functionalized with silver nanoparticles

Biointerface Research in Applied Chemistry ◽

10.33263/briac0103.592598 ◽

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.

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Synthesis of Gold Nanobipyramids by Seed-mediated Method and Santibacterial Activities

Communications in Physics ◽

10.15625/0868-3166/28/2/10846 ◽

2018 ◽

Vol 28 (2) ◽

pp. 179 ◽

Cited By ~ 1

Author(s):

Ngo Vo Ke Thanh ◽

Huynh Trong Phat ◽

Nguyen Thi Kim Anh ◽

Nguyen Dang Giang ◽

Lam Quang Vinh

Keyword(s):

Silver Nanoparticles ◽

Metallic Nanoparticles ◽

Cetyltrimethylammonium Bromide ◽

Antibacterial Agents ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Seed Mediated ◽

Antibacterial Nanoparticles ◽

Gold Nanobipyramids ◽

And Staphylococcus Aureus

Metallic nanoparticles as antibacterial agents have been studied for several years. The most used antibacterial nanoparticles are silver nanoparticles. The mechanisms and antibacterial properties of silver nanoparticles are well known, but the effects of gold nanoparticles, especially gold Nano bipyramids, are not considered. In this research, we synthesized gold nanobipyramids (NBPs) by seed mediated method using surfactant cetyltrimethylammonium bromide (CTAB). After preparing, gold nanobipyramids is removed CTAB and modified the surface using polyethylene glycol, polyvinyl alcohol and chitosan as the stabilizers. Besides, antibacterial effects of gold nanobipyramids on both Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) are investigated in this paper. The results show that gold nanobipyramids have good antibacterial activities even at low concentration. The optimal concentration of stabilizers and gold nanobipyramids in antibacterial activities are also studied in this paper.

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