SCIENTIFIC BASIS OF SILVER NANOPARTICLES COATINGS FORMATION ON SURFACE  OF POLYPROPYLENE ULTRATHIN FIBERS

New principles of silver nanoparticles coatings formation on the ultrathin fibers surface using electromagnetic radiation of the deci- and nanometer ranges for bactericidal modification of liquid media were proposed. Coating production involves the formation of silver nanoparticles as a result of photoreduction from an aqueous solution of AgNO3 with a concentration of 0.001M at the presence of ultrathin polypropylene fibers with their subsequent stabilization on the surface of the fibers with microwave radiation of the fiber material are initiated, which prevents agglomeration and stabilize silver nanoparticles on their surface. Ultrathin polypropylene fibers obtained as a result of pneumatic spraying of the melt are represented by an average diameter dav = 1.5-6 μm and a fairly wide lognormal distribution. The possibility of a two-step formation of coatings on the polymer fibers surface has been demonstrated using the method of numerical simulation of the self-assembly and self-organization of silver nanoparticles, taking into account the dissipation of their energy into the polymeric matrix through the exciton and phonon channels. It has been established that as a result of local microwave heating of silver nanoparticles, processes of the formation of supramolecular structures of the fiber material are initiated, which prevents agglomeration and stabilizes silver nanoparticles on their surface. The coatings obtained were characterized by transmission electron microscopy and spectroscopy. For example, silver nanoparticles formed and attached to the surface of fibers as a result of a ten-minute exposure to ultraviolet radiation have a size of 50 ± 18 nm. Studies of bactericidal activity showed that ultrathin polypropylene fibrous materials with coatings based on silver nanoparticles can effectively perform antibacterial treatment of natural waters with a high level of microbiological contamination. After 10 cycles of water purification, the amount of silver in the samples, according to atomic emission spectroscopy, remains unchanged.

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Adsorption of Silver Nanoparticles on Modified Surfaces

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.75 ◽

2015 ◽

Vol 645-646 ◽

pp. 75-79

Author(s):

Can Gao ◽

Tan Guo ◽

Xiu Shen Ye ◽

Hui Fang Zhang ◽

Hai Ning Liu ◽

...

Keyword(s):

Silver Nanoparticles ◽

Self Assembly ◽

Electrostatic Interactions ◽

Average Diameter ◽

Ag Nps ◽

Electron Microscopic ◽

Sem Images ◽

Glass Slides ◽

Transmission Electron ◽

Adsorption Processes

Uniform films of silver nanoparticles (Ag NPs) were fabricated by self-assembly on 3-aminopropyltriethoxysilane (APTES) and [3-(2-aminoethyl) aminopropyl] trimethoxysilane (AEAPTES) modified glass slides. A stable Ag NPs suspension was synthesized via the reduction of silver nitrate using sodium citrate. Bulk characteristics of Ag NPs in aqueous solution were carried out by measuring their absorption spectrum, morphology and particle shape using the UV-vis absorption spectroscopy and transmission electron microscopy (TEM), respectively. The average diameter of Ag NPs is about 50 nm. The coverage of adsorbed particles on the modified glasses was measured by scanning electron microscopic imaging (SEM). The SEM images indicate that the Ag NPs films on the glasses are uniform. It is supposed that the adsorption processes are mainly controlled by electrostatic interactions. The adsorption amount of Ag NPs on APTES modified glass slides is much more than the amount on AEAPTES modified glass slides.

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Construction of Chitosan/Alginate Nano-Drug Delivery System for Improving Dextran Sodium Sulfate-Induced Colitis in Mice

Nanomaterials ◽

10.3390/nano11081884 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1884

Author(s):

Mengfei Jin ◽

Shangyong Li ◽

Yanhong Wu ◽

Dandan Li ◽

Yantao Han

Keyword(s):

Self Assembly ◽

Average Diameter ◽

Mucosal Healing ◽

Plga Nanoparticles ◽

Narrow Particle Size Distribution ◽

Layer By Layer ◽

Systemic Side Effects ◽

Assembly Technology ◽

The Fourier Transform ◽

Polyelectrolyte Film

(1) Background: In the treatment of ulcerative colitis (UC), accurate delivery and release of anti-inflammatory drugs to the site of inflammation can reduce systemic side effects. (2) Methods: We took advantage of this goal to prepare resveratrol-loaded PLGA nanoparticles (RES-PCAC-NPs) by emulsification solvent volatilization. After layer-by-layer self-assembly technology, we deposited chitosan and alginate to form a three-layer polyelectrolyte film. (3) Results: It can transport nanoparticles through the gastric environment to target inflammation sites and slowly release drugs at a specific pH. The resulting RES-PCAC-NPs have an ideal average diameter (~255 nm), a narrow particle size distribution and a positively charged surface charge (~13.5 mV). The Fourier transform infrared spectroscopy showed that resveratrol was successfully encapsulated into PCAC nanoparticles, and the encapsulation efficiency reached 87.26%. In addition, fluorescence imaging showed that RES-PCAC-NPs with positive charges on the surface can effectively target and accumulate in the inflammation site while continuing to penetrate downward to promote mucosal healing. Importantly, oral RES-PCAC-NPs treatment in DSS-induced mice was superior to other results in significantly improved inflammatory markers of UC. (4) Conclusions: Our results strongly prove that RES-PCAC-NPs can target the inflamed colon for maximum efficacy, and this oral pharmaceutical formulation can represent a promising formulation in the treatment of UC.

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Self-assembly and branching of sucrose stabilized silver nanoparticles by microwave assisted synthesis: From nanoparticles to branched nanowires structures

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2009.07.023 ◽

2009 ◽

Vol 348 (1-3) ◽

pp. 205-211 ◽

Cited By ~ 16

Author(s):

Emanuela Filippo ◽

Antonio Serra ◽

Daniela Manno

Keyword(s):

Silver Nanoparticles ◽

Self Assembly ◽

Microwave Assisted Synthesis ◽

Microwave Assisted

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Fabrication of silver nanoparticles/polyaniline composite thin films using Layer-by-Layer self-assembly technique for ammonia sensing

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2014.11.019 ◽

2015 ◽

Vol 467 ◽

pp. 57-65 ◽

Cited By ~ 20

Author(s):

Ekarat Detsri ◽

Jittaporn Popanyasak

Keyword(s):

Thin Films ◽

Silver Nanoparticles ◽

Self Assembly ◽

Layer By Layer ◽

Composite Thin Films ◽

Ammonia Sensing ◽

Assembly Technique

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Control of Surface Plasmon Localization via Self-Assembly of Silver Nanoparticles along Silver Nanowires

Journal of the American Chemical Society ◽

10.1021/ja807218e ◽

2008 ◽

Vol 130 (51) ◽

pp. 17240-17241 ◽

Cited By ~ 50

Author(s):

M. Linh Tran ◽

Silvia P. Centeno ◽

James A. Hutchison ◽

Hans Engelkamp ◽

Duoduo Liang ◽

...

Keyword(s):

Silver Nanoparticles ◽

Surface Plasmon ◽

Self Assembly ◽

Silver Nanowires

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From hollow lignin microsphere preparation to simultaneous preparation of urea encapsulation for controlled release using industrial kraft lignin via slow and exhaustive acetone-water evaporation

Holzforschung ◽

10.1515/hf-2019-0062 ◽

2019 ◽

Vol 74 (1) ◽

pp. 77-87 ◽

Cited By ~ 2

Author(s):

Miao Wang ◽

Yadong Zhao ◽

Jiebing Li

Keyword(s):

Controlled Release ◽

Self Assembly ◽

Average Diameter ◽

Kraft Lignin ◽

Water Evaporation ◽

Shell Wall ◽

Straightforward Method ◽

Acetone Water ◽

Direct Preparation ◽

Microsphere Preparation

AbstractLignin nano/microparticles have recently attracted growing interest for various value-additive applications of lignin, especially encapsulation. In this study, in order to establish a highly efficient and highly productive preparation process to effectively utilize technical lignin, a brand-new, slow and exhaustive solution evaporation process following a simple, self-assembly principle was developed using industrial softwood kraft lignin (SKL) from a starting acetone-water (80/20, v/v) solution to recover 100% of the lignin as homogeneous and well-shaped microspheres. The prepared microspheres had a typical average diameter of 0.81 ± 0.15 μm and were hollow with very thin shells (of nanoscale thickness). Based on this developed technique, encapsulation of urea by these lignin microspheres was directly achieved using the same process as hollow lignin microspheres with urea attached to the outside and entrapped inside of the wall. Two distinct urea release rates were observed for the urea-encapsulated microspheres: a fast release of the urea outside the shell wall and a slow (controlled) release of the urea inside the shell wall. The encapsulation efficiency was as high as 46% of the trapped urea as encapsulated inside the lignin microspheres. The slow and exhaustive solution evaporation procedure reported here is a simple and straightforward method for the valorization of industrial kraft lignin as hollow microspheres with controllable, homogeneous and desired morphologies, and especially for the direct preparation of lignin-based encapsulating fertilizers for controlled release.

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Novel static magnetic field effects on green chemistry biosynthesis of silver nanoparticles in Saccharomyces cerevisiae

Scientific Reports ◽

10.1038/s41598-021-99487-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Ameni Kthiri ◽

Selma Hamimed ◽

Abdelhak Othmani ◽

Ahmed Landoulsi ◽

Siobhan O’Sullivan ◽

...

Keyword(s):

Magnetic Field ◽

Saccharomyces Cerevisiae ◽

Silver Nanoparticles ◽

Magnetic Fields ◽

Green Chemistry ◽

Static Magnetic Field ◽

Culture Medium ◽

Average Diameter ◽

Magnetic Field Effects ◽

Static Magnetic Fields

AbstractThe bacteriocidal properties of silver nanoparticles (AgNPs) depend on their average diameter (toxicity increases with decreasing diameter). In the present work, we describe novel green chemistry biosynthesis of AgNPs from AgNO3 added to cell-free culture medium of baker’s yeast, Saccharomyces cerevisiae, yielding nanoparticles in the range 11–25 nm. However, when yeast was grown in a moderate static magnetic field, AgNPs obtained from the resulting cell-free culture medium, were significantly smaller (2–12 nm) than those obtained without magnetic field. These latter nanoparticles were highly crystalline, stable and near-uniform shape. Furthermore, the antibacterial activity of AgNPs obtained from static magnetic fields were greater than those from control cultures. Static magnetic fields show a promising ability to generate biocidal nanoparticles via this novel green chemistry approach.

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