scholarly journals Polyacrylonitrile Nanofibers Containing Viroblock as Promising Material for Protective Clothing

2021 ◽  
Vol 11 (23) ◽  
pp. 11469
Author(s):  
Mujtaba Hussain ◽  
Abdul Salam ◽  
Muhammad Fahad Arain ◽  
Azeem Ullah ◽  
Anh-Tuan Dao ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Protective Clothing ◽  
Composite Nanofibers ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Lipid Vesicle ◽  
Infectious Agents ◽  
Bactericidal Property ◽  
Water Contact ◽  
Electrospinning Method

Antimicrobial viroblock/polyacrylonitrile nanofiber webs fabricated using the electrospinning method were assessed in terms of the antimicrobial activity against infectious agents as a potential material used in mask production. Viroblock (VB) is an amalgam of lipid vesicle and silver. Lipid vesicle depletes the virus outer membrane, which contains cholesterol, while silver ions penetrate the virus, interact with sulfur-bearing moieties, and possess the virus bactericidal property. VB, having anti-coronavirus and anti-influenza properties, was prepared in four different concentrations, 0.5 wt%, 1 wt%, 1.5 wt%, and 2 wt%, in regard to nanofiber weight. The resultant nanofibers were characterized by scanning electron microscope (SEM), Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), water contact angle, water content, and thermogravimetric analysis (TGA). Moreover, all nanofibrous samples were evaluated for cell proliferation assay and ATCC antibacterial tests. Based on characterization results and cytotoxicity, the developed composite nanofibers-based webs showed good promise for utilization in anti-viral masks. Particularly, 2 wt% VB/PAN nanofibers have the highest antibacterial properties against negative and positive bacteria along with excellent cell viability.

Composited Silver-Contained PA 6 Electrospun Fibers with Spunbond Nonwovens for Filtration Applications

2011 ◽  
Vol 287-290 ◽  
pp. 2626-2629 ◽  
Author(s):  
Yi Jun Pan ◽  
Wei Sheng Chuang ◽  
Chao Yu Lin ◽  
Chun Hua Chu
Keyword(s):  
Electrospun Fiber ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Polyamide 6 ◽  
Filtration Efficiency ◽  
Electrospun Fibers ◽  
Silver Particles ◽  
Filter Media ◽  
Electrospinning Method ◽  
Composite Filter

By using electrospinning method, polyamide 6 (PA 6) nanofibers containing 1 wt% of AgNo3 were spun from different concentrations solutions (15-25 wt%) for use as composite filter media. The silver ions in PA 6 nanofibers were reduced by ascorbic acid solution to silver particles offering antibacterial properties to the final filter after electrospinning. The results show, fibers with mean diameters less than 160 nm were prepared for use as filter media by electrospinning. The diameter of electrospun fiber was proportioned to the viscosity of PA 6 solution but was inversed to the applied electrical voltage. The viscosities of PA 6 solution were decreased by adding of AgNo3 from which brought more irregular formation of electrospun fibers. The filtration efficiency of spunbond nonwoven would improve greatly by compositing the electrospun PA6 web with or without silver.

Hydrophobic silica-aerogel integrated polyacrylonitrile nanofibers

2020 ◽  
pp. 152808372093967
Author(s):  
Refik Arat ◽  
Havva Baskan ◽  
Gulay Ozcan ◽  
Pelin Altay
Keyword(s):  
Thermal Stability ◽  
Thermal Insulation ◽  
Silica Aerogel ◽  
Protective Clothing ◽  
Composite Nanofibers ◽  
High Specific Surface Area ◽  
Water Contact ◽  
Insulating Material ◽  
Silicon Alkoxides ◽  
Thermal Stability Of

Owing to its high specific surface area, high thermal stability and excellent thermal insulation, silica aerogel is used as an insulating material in protective clothing. In this study, the hydrophobicity and thermal insulation properties of the electrospun polyacrylonitrile (PAN) nanofibers were enhanced by integrating silica aerogel (SA), which was synthesized using silicic acid as silica precursor instead of silicon alkoxides or sodium silicate and modified with phenyltrimethoxysilane. The electrospun PAN-SA composite nanofibers showed higher surface roughness and hydrophobicity (water contact angle of 142°) compared to the smooth and hydrophilic PAN (control) nanofiber. Further, the thermal stability of the PAN nanofibers was increased by 17 °C while their thermal conductivity was decreased from 15.8 W/mK to 0.4 W/mK (reduction of 97.5%). These features make the PAN-SA composite nanofibers particularly suitable for use in thermal insulation protective clothing.

Effect of Silver Ions on the Structural and Antibacterial Properties of Bone Replacement Material

2013 ◽  
Vol 795 ◽  
pp. 692-696 ◽  
Author(s):  
Nida Iqbal ◽  
Mohammed Rafiq Abdul Kadir ◽  
Nasrul Humaimi Bin Mahmood ◽  
Micheal Moses ◽  
Mashitah Binti Mad Salim ◽  
...  
Keyword(s):  
Calcium Phosphates ◽  
Bacterial Species ◽  
Calcium Nitrate ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Antibacterial Activities ◽  
Silver Addition ◽  
Wide Range ◽  
Microbial Infections ◽  
Inorganic Mineral

Antibacterial materials based on calcium phosphates have wide range of biomedical applications in the prevention of microbial infections. The synthesis of inorganic mineral component of bone i.e. hydroxyapatite was done with the addition of silver (Ag) (5-15 wt %) as antibacterial agent. The wet precipitation synthesis was carried out using diammonium hydrogen phosphate and calcium nitrate as P and Ca precursors. The presence and effect of silver addition on the structure was studied using Fourier Transform-Infrared (FTIR) spectroscopy and Energy Dispersive X-ray (EDX) techniques. The antibacterial properties of all samples were evaluated using Disc Diffusion Technique (DDT) againstS. aureus,B. subtilis, P. aeruginosaandE. coli. Antibacterial activities of samples were found to vary depending on the bacterial species and Ag loading percentage. The antibacterial assay suggested that the addition of Ag ions within hydroxyapatite can be effectively provided the required level of antibacterial activity against bacteria.

Immobilization of Silver Nanoparticles on Chitosan-Coated Silica-Gel-Beads and the Antibacterial Activity

2021 ◽  
Vol 892 ◽  
pp. 36-42
Author(s):  
Muhammad Iqbal Hidayat ◽  
Muhammad Adlim ◽  
Ilham Maulana ◽  
Muhammad Zulfajri
Keyword(s):  
Silver Nanoparticles ◽  
Silica Gel ◽  
Low Cost ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Silver Ions ◽  
Filter Material ◽  
Silver Ion ◽  
Gel Beads ◽  
Metal Colloid

Silver nanoparticles (Ag0) have attracted the most attention due to their broad antimicrobial application and outstanding activity. The silver nanoparticles are usually in colloidal form, then immobilization the colloid onto solid support is still interesting to explore. In this work, a new method for silver colloidal nanoparticle immobilization on silica gel beads (SiG), which was then symbolized as Ag0-[chi-SiG] was conducted and characterized successfully. The finding proved that SiG must be coated with three chitosan film layers to give stable support for silver nanoparticles. This coating method caused the chitosan completely covered SiG, and the chitosan film provides coordination bonding for silver ions. The most appropriate solvent for silver ion impregnation on the surface of chi-SiG is methanol compared to other solvents. Tungsten lamp as the photo-irradiation, which is low cost and environmentally friendly has been proven effective for silver ion reduction, as shown by silver metal colloid UV-Vis surface plasmon resonance at 400-700 nm. Ag0-[chi-SiG] showed the antibacterial properties of inhibiting the growth Staphylococcus aureus and Escherichia coli; then it provides the potential application for antibacterial filter material. According to the weight comparison between antibacterial standard and Ag content, then Ag0-[chi-SiG] has two and five times higher of exhibiting zone for each bacteria.

Preparation of TiO2–SiO2 Hybrid Nanosols Coated Flame-Retardant Polyester Fabric Possessing Dual Contradictory Characteristics of Superhydrophobicity and Self Cleaning Ability

2020 ◽  
Vol 20 (3) ◽  
pp. 1780-1789 ◽  
Author(s):  
Priyanka Katiyar ◽  
Shraddha Mishra ◽  
Anurag Srivastava ◽  
N. Eswara Prasad
Keyword(s):  
Electron Microscopy ◽  
Contact Angle ◽  
Flame Retardant ◽  
Protective Clothing ◽  
Sol Gel ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Contact ◽  
Vis Spectroscopy ◽  
Self Cleaning

TiO2, SiO2 and their hybrid nanocoatings are prepared on inherent flame retardant textile substrates from titanium(IV)iso-proproxide (TTIP) and tetraethoxysilane (TEOS) precursors using a sol–gel process followed by hydrothermal treatment. The coated samples are further functionalized by hexadecyltrimethoxysilane (HDTMS) to impart superhydrophobicity. Sample characterization of the nanosols, nanoparticles and coated samples are investigated using, X-ray diffractometer, transmission electron microscopy, scanning electron microscopy, UV-Vis spectroscopy, contact angle measurement. Stain degradation test under mild UV irradiation shows almost 54% degradation of coffee stain within 4 hours measured by Spectrophotometer. UV-Vis Absorption Spectroscopy demonstrates complete degradation of methyl orange colorant within 3 hours. Hybrid nanosol coated and HDTMS modified inherent flame retardant polyester surfaces show apparent water contact angle as ~145°, which is much closer to proximity of superhydrophobic surfaces. Thus, the novelty of present work is, by using sol–gel technique, a bi-functional textile surface has been developed which qualifies the very specific requirements of protective clothing like self-cleaning property (imparted by TiO2 nanoparticles) and superhydrophobicity (imparted by SiO2 nanoparticles and further surface modification by HDTMS), which are entirely contradictory in nature, in a single fabric itself. Thus developed textile surfaces also possess the other attributes of protective clothing like flame retardancy and air permeability.

Preparation and antibacterial properties of an AgBr@SiO2/GelMA composite hydrogel

2022 ◽  
Author(s):  
Bo Li ◽  
Hong Li ◽  
Haocheng Yang ◽  
Yue Shu ◽  
Kejiang Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Uv Light ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Skin Wound ◽  
Wound Dressings ◽  
Sprague Dawley ◽  
Sio2 Microspheres ◽  
Modified Stöber Method

Abstract Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg/mL, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg/mL AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.

scholarly journals Fabrication of bio-based polyurethane nanofibers incorporated with a triclosan/cyclodextrin complex for antibacterial applications

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3450-3458 ◽  
Author(s):  
Joo Hyung Lee ◽  
Sang Ho Park ◽  
Seong Hun Kim
Keyword(s):  
Antibacterial Properties ◽  
Cyclodextrin Complexes ◽  
Cyclodextrin Complex ◽  
Electrospinning Method

Bio-polyurethane nanofibers containing triclosan–cyclodextrin complexes to enhance antibacterial properties were prepared using an electrospinning method.

Preparation of PCL/PVP/Ag Nanofiber Membranes by Electrospinning Method

2012 ◽  
Vol 268-270 ◽  
pp. 580-583 ◽  
Author(s):  
Yong Tang Jia ◽  
Cui Wu ◽  
Feng Chun Dong ◽  
Gang Huang ◽  
Xian Hua Zeng
Keyword(s):  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Composite Nanofibers ◽  
Average Diameter ◽  
Vinyl Pyrrolidone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrospinning Method ◽  
Nanofiber Membranes ◽  
Poly Vinyl Pyrrolidone

The composite nanofiber membranes of poly (ε-caprolactone)/poly(vinyl pyrrolidone) (PCL/PVP) containing silver nanoparticles were prepared by electrospinning method. The morphology of composite nanofibers was characterized by scanning electron microscopy (SEM). The silver nanoparticles on the electrospun fibers were characterized by X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The contact angle and water uptake of PCL/PVP/Ag nanofiber membranes were measured. The SEM photos indicated that the average diameter of the fibers was significantly decreased with the addition of silver nanoparticles. The X-Ray images showed that Ag nanoparticles were distributed on the surface of nanofiber membranes. When the PVP mole ratio was higher than 15%, the nanofiber membranes showed good hydrophilic property. The PCL/PVP/Ag nanofiber membranes could be applied to prepare wound dressing.

Using antibacterial fibers and metallic wires to make woven fabrics used as smart diapers

2020 ◽  
pp. 152808372093037
Author(s):  
Bing-Chiuan Shiu ◽  
Jia-Ci Jhang ◽  
Ting-Ting Li ◽  
Hao-kai Peng ◽  
Li-wei Wu ◽  
...  
Keyword(s):  
Short Circuit ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Bottom Layer ◽  
Woven Fabrics ◽  
Cellular Phones ◽  
Electric Resistance ◽  
Nonwoven Fabrics ◽  
Metallic Wires ◽  
Moisture Absorbent

Cloth diapers also known as eco-diapers, traditional sandwich-structured eco-diapers are composed of top and bottom layers that are made of cotton or polyester nonwoven fabrics. On account of the hydrophilic bottom layer, urine permeates when the water absorption reaches saturation. In this study, polypropylene is melt-blown into hydrophobic polypropylene nonwoven fabrics to be used as the top and bottom layer. Polypropylene is hydrophobic but after being fabricated into nonwoven fabrics, the porous structure enables the urine to leak to the absorbent interlayer of eco-diapers. Hence, the top layer of diaper does not contain urine, which makes smart diapers more comfortable than cloth diapers that are made of cotton or other moisture-absorbent materials. Moreover, the sensing mechanism via Bluetooth module can detect the water content of the interlayer with a view to improving the demerit of urine leakage. The interlayer is the sensing layer that has antibacterial function. Two types of antibacterial yarns are treated by zinc oxide and silver ions. The yarns are fabricated into antibacterial woven fabrics, after which the antibacterial properties of fabrics are investigated with quantitative and qualitative tests. Next, two parallel metallic wires are assembled in order to trigger short circuit when sensing moisture, thereby obtaining different electric resistance based on different moisture levels. Furthermore, the miniature senor can signify the cellular phones or buzzers when the two metallic wires generate electrical resistance due to the presence of urine. The metallic wires are silver-plated copper yarns, stainless steel fibers, and copper fibers, which possess different electric resistance for the corresponding miniature sensors. This study proposes an efficient manufacture of smart diapers that require only a combination of woven fabrics and two metallic wires to sense moisture, the design of which can be encompassed in diverse fields.

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