Effect of Silver Nanoparticles in Silicalite-1 Zeolite on Antireflection and Antibacterial Performances

A nano-sized zeolite has been prepared in an autoclave, using tetraethoxysilane (TEOS), tetrapropylammonium hydroxide (TPAOH) and H2O at various hydrothermal synthesis temperatures. Using transmission electron microscopy and particle size analysis, the size of the nano-sized powders was revealed to be 10–300 nm and its distribution was uniform and spherical, depending on the hydrothermal temperature. X-ray diffraction analysis confirmed that the nano-sized powder was the silicalite-1 zeolite. A coating sol could be prepared by the proper combination of these nanoparticles with a solvent. The resulting coating on the glass substrate showed an antireflection effect, with less than 2–3% average reflectance over the visible range. In addition, the effect of silver nanoparticles in the silicalite-1 zeolite on antibacterial performances was carried as a function of the amount of nano-sized silver used. With increasing amounts of nano-sized silver, the number of colony forming unit decreased and became almost to zero.

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Green Synthesized Silver Nanoparticles Immobilized on Activated Carbon Nanoparticles: Antibacterial Activity Enhancement Study and Its Application on Textiles Fabrics

Molecules ◽

10.3390/molecules26133790 ◽

2021 ◽

Vol 26 (13) ◽

pp. 3790

Author(s):

Pratama Jujur Wibawa ◽

Muhammad Nur ◽

Mukhammad Asy’ari ◽

Wijanarka Wijanarka ◽

Heru Susanto ◽

...

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Activity ◽

Activated Carbon ◽

Aloe Vera ◽

Particle Size Analysis ◽

Size Analysis ◽

E Coli ◽

Transmission Electron ◽

Average Size ◽

Green Synthesized Silver Nanoparticles

This research aimed to enhance the antibacterial activity of silver nanoparticles (AgNPs) synthesized from silver nitrate (AgNO3) using aloe vera extract. It was performed by means of incorporating AgNPs on an activated carbon nanoparticle (ACNPs) under ultrasonic agitation (40 kHz, 2 × 50 watt) for 30 min in an aqueous colloidal medium. The successful AgNPs synthesis was clarified with both Ultraviolet-Visible (UV-Vis) and Fourier Transform Infrared (FTIR) spectrophotometers. The successful AgNPs–ACNPs incorporation and its particle size analysis was performed using Transmission Electron Microscope (TEM). The brown color suspension generation and UV-Vis’s spectra maximum wavelength at around 480 nm confirmed the existence of AgNPs. The particle sizes of the produced AgNPs were about 5 to 10 nm in the majority number, which collectively surrounded the aloe vera extract secondary metabolites formed core-shell like nanostructure of 8.20 ± 2.05 nm in average size, while ACNPs themselves were about 20.10 ± 1.52 nm in average size formed particles cluster, and 48.00 ± 8.37 nm in average size as stacking of other particles. The antibacterial activity of the synthesized AgNPs and AgNPs-immobilized ACNPs was 57.58% and 63.64%, respectively (for E. coli); 61.25%, and 93.49%, respectively (for S. aureus). In addition, when the AgNPs-immobilized ACNPs material was coated on the cotton and polyester fabrics, the antibacterial activity of the materials changed, becoming 19.23% (cotton; E. coli), 31.73% (polyester; E. coli), 13.36% (cotton; S. aureus), 21.15% (polyester; S. aureus).

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The Evaporative Decomposition of Solutions Method (Eds) for the Production of Ultrafine Y1Ba2Cu3O7 from Nitrate and Mixed Anion Precursor Solutions

MRS Proceedings ◽

10.1557/proc-169-385 ◽

1989 ◽

Vol 169 ◽

Cited By ~ 2

Author(s):

Rollin E. Lakis ◽

Sidney R. Butler

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

Barium Carbonate ◽

Hollow Spheres ◽

Particle Size Analysis ◽

Size Analysis ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron

AbstractY1Ba2Cu3O7 has been prepared by the evaporative decomposition of solutions method. Nitrate and mixed anion solutions were atomized and decomposed at temperatures ranging from 300°C to 950°C. The resulting materials have been characterized using x-ray powder diffraction, Thermal Gravimetric Analysis (TGA), particle size analysis, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The powder consists of 0.3 micron agglomerated hollow spheres with a primary particle size of 0.06 micron. TGA and x-ray diffraction indicate the presence of barium nitrate and barium carbonate due to incomplete decomposition and/or product contamination by the process environment.

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Particle Size Analysis of the Synthesized Al2O3 by Dissolution and Alkali Fusion-Coprecipitation Methods

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.860.128 ◽

2020 ◽

Vol 860 ◽

pp. 128-134

Author(s):

Cahyaning Fajar Kresna Murti ◽

Malik Anjelh Baqiya ◽

Endarko ◽

Triwikantoro

Keyword(s):

Particle Size ◽

Ammonium Hydroxide ◽

Particle Size Analysis ◽

Fusion Product ◽

Size Analysis ◽

Particle Sizes ◽

X Ray Diffraction ◽

Bottom Up ◽

Alkali Fusion ◽

Transmission Electron

Particle size analysis of synthesized Al2O3 by dissolution and alkali fusion-coprecipitation methods has been conducted. The formation of nano- or microparticles can be synthesized by the top-down (physically) and bottom-up (chemically) methods. In this study, the commercial alumina (Merck) with the particle size of 63 µm was synthesized through the bottom-up method. The dissolution method was done by reacting to alumina with ammonium hydroxide (NH4OH). The alkali fusion method was carried out by reacting alumina with sodium hydroxide (NaOH) and it obtained by coprecipitation of the alkali fusion product with HCl and NH4OH. The result from both methods were calcined at 600°C. The phase of synthesized Al2O3 was identified by using X-ray diffraction (XRD), whereas the morphology observed using a transmission electron microscope (TEM), and the particle sizes measured by particle sizes analyzer (PSA). The XRD pattern shows the γ-Al2O3 phases with particle sizes of ~33 nm and ~25 nm from TEM observations, while the PSA results revealed agglomerated particles with particle sizes of 1263 nm and 477 nm for the dissolution and alkali fusion-coprecipitation method, respectively. Therefore, both methods can be used to reduce the particle size of γ-Al2O3.

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Preparation, Characterization of Co3O4 Nano-Particles and its Catalytic Effect on the Combustion of Fuel Rich Propellants

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.560-561.284 ◽

2012 ◽

Vol 560-561 ◽

pp. 284-288 ◽

Cited By ~ 1

Author(s):

Wei Qiang Pang ◽

Xiao Bing Shi ◽

Yang Li

Keyword(s):

Particle Size ◽

Catalytic Effect ◽

Solid Phase ◽

Particle Size Analysis ◽

Nano Particles ◽

Size Analysis ◽

X Ray Diffraction ◽

Transmission Electron ◽

Wide Size Distribution

The mono-dispersed Co3O4 nano-particles were prepared by means of solid phase synthetical method. The particle size, specific surface area, crystal structure and morphology of the samples were characterized by laser particle size analysis, x-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The catalytic effects of nano-particles on the combustion of fuel rich propellant were investigated. The results show that the Co3O4 nano-particles prepared are uniform and with relatively wide size distribution curve. The catalytic effect of Co3O4 nano-particles on the fuel rich propellant is stronger than those of micro-sized Co3O4 particles and CuO nano-particles.

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A Study and Comparison of the Preparation of Gadolinium Aluminate Nanoparticles Using γ-Irradiated and Unirradiated Precursors

Advances in Materials Science and Engineering ◽

10.1155/2018/9128696 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Tehani I. Al-Muhimeed ◽

Abdullah A. Al-Kahtani ◽

Refaat M. Mahfouz ◽

Mujeeb Khan ◽

M. Rafiq H. Siddiqui

Keyword(s):

Electron Microscopy ◽

Solid State ◽

Sol Gel ◽

Particle Size Analysis ◽

Size Analysis ◽

Sintered Pellet ◽

X Ray Diffraction ◽

Gadolinium Nitrate ◽

Transmission Electron ◽

Sol Gel Process

The effects of γ-irradiation and the application of different precursors on the formation of gadolinium aluminate (GdAlO3) nanoparticles (NPs) have been studied in detail. GdAlO3 NPs were prepared by using different gadolinium-based precursors including gadolinium acetate (Gd(CH3COO)3·4H2O) and gadolinium nitrate (Gd(NO3)3·6H2O), while Al2O3 and Al(NO3)3·9H2O were used as the source of Al3+. The preparation of GdAlO3 was carried out by two different methods, solid-state reaction and sol-gel process. To study the effect of γ-irradiation, both irradiated and unirradiated Gd(CH3COO)3·4H2O have been tested for the preparation of gadolinium aluminate (GdAlO3). Notably, Gd(CH3COO)3·4H2O did not produce GdAlO3 in both solid-state and sol-gel processes even after optimizing various parameters, including the application of γ-irradiation. However, single-phase nanocrystalline GdAlO3 NPs were successfully obtained from the reaction of gadolinium nitrate Gd(NO3)3·6H2O and Al(NO3)3·9H2O by a sol-gel process. The formation of NPs has been confirmed by X-ray diffraction analysis (XRD) and Fourier-transform infrared (FT-IR) spectroscopy. The results indicate towards the formation of an orthorhombic perovskite structure of GdAO3 in the Pbnm space group. Transmission electron microscopy (TEM) has been employed for the particle-size analysis, which revealed the formation of spherical-shaped nanoparticles with the size range of 50–70 nm. Surface morphology of the sintered pellet was obtained from high-resolution scanning electron microscopy (HR-SEM). Besides, the effect of irradiation with γ-rays on the quality of resultant NPs has also been studied.

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Novel Synthesis of Ultra-Small Silver Nanoparticles with High Antimicrobial Activity

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.1080 ◽

2008 ◽

Vol 47-50 ◽

pp. 1080-1083 ◽

Cited By ~ 2

Author(s):

H.J. Lee ◽

M.A. Do ◽

E.J. Kim ◽

J.H. Yeum ◽

H.D. Ghim ◽

...

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Antimicrobial Activity ◽

Silver Nanoparticles ◽

Particle Size Analysis ◽

Wound Dressings ◽

Size Analysis ◽

High Antimicrobial Activity ◽

Novel Synthesis ◽

Transmission Electron

Ultra-small and well dispersed silver nanoparticles were prepared by mixing AgNO3 in PEI (polyethylenimine) solution. Particle size analysis and transmission electron microscopy confirmed that the average diameters of PEI/silver nanoparticles are 20-40 nm. The ultra-small silver nanoparticles had an antimicrobial activity in the aqueous solution at the concentration over 0.0105% by M.I.C test. Suggestively, the PEI/silver nanoparticles have potentials for development of wound dressings.

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Synthesis and Characterization of Novel Modified SBA-15/PSF Nanocomposite Membrane Coated by PDMS for Gas Separation

Journal of Nanotechnology in Engineering and Medicine ◽

10.1115/1.4003862 ◽

2011 ◽

Vol 2 (2) ◽

Cited By ~ 3

Author(s):

A. Jomekian ◽

M. Pakizeh ◽

M. Poorafshari ◽

S. A. A. Mansoori

Keyword(s):

Electron Microscopy ◽

Particle Size Analysis ◽

Gas Permeation ◽

Nanocomposite Membrane ◽

Size Analysis ◽

X Ray Diffraction ◽

Transmission Electron ◽

Structure Of Nanoparticles ◽

Electron Microscopy Analysis ◽

Microscopy Analysis

SBA-15 nanoparticles were prepared by in situ assembly of inorganic precursors and CTAB. The structure of nanoparticles was characterized by X-ray diffraction, transmission electron microscopy, particle size analysis, and N2 adsorption techniques. The surface modification of particles in order to perfect dispersion in PSF matrix was performed by DMDCS and APTMS as new modification agents. Thermogravimetric analysis and scanning electron microscopy analysis were applied to investigate thermal stability and quality of distribution of particle in the nanocomposite membrane, respectively. The PDMS was used to coat the possible defects of synthesized membranes. For all gases (N2, CO2, CH4, and O2), the permeance of uncoated DMDCS modified SBA-15/PSF (20 wt %) raised from 16 to 31.6, 0.47–0.99, 0.45–1.1 and 2.75–5.33 for CO2, N2, CH4, and O2, respectively in comparison with PSF. The corresponding values of CO2, N2, CH4, and O2 permeances through uncoated APTMS modified SBA-15/PSF (20 wt %) enhanced to 29.12, 0.8, 0.85, and 4.75 respectively, compared with neat PSF membrane. The ideal selectivities of CO2/CH4 and O2/N2 for DMDCS modified SBA-15 (20 wt %) nanocomposite membranes coated by 30 wt % PDMS solution enhanced from 26 to 35 and from 5.4 to 7.1, respectively. Using APTMS as modification agent resulted in higher selectivity of CO2/CH4 (38.2) and O2/N2 (7.2) than those of DMDCS modified. The measured actual selectivities of CO2/CH4 and O2/N2 and permeances of all gases tested are a few amounts lower than ideal selectivities and permeances of gases in single gas permeation tests but are still much higher than those for pure PSF.

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Mining Wastes of an Albite Deposit as Raw Materials for Vitrified Mullite Ceramics

Minerals ◽

10.3390/min11030232 ◽

2021 ◽

Vol 11 (3) ◽

pp. 232

Author(s):

Pedro J. Sánchez-Soto ◽

Eduardo Garzón ◽

Luis Pérez-Villarejo ◽

George N. Angelopoulos ◽

Dolores Eliche-Quesada

Keyword(s):

Particle Size ◽

Raw Materials ◽

Phase Evolution ◽

Particle Size Analysis ◽

Size Analysis ◽

Mining Wastes ◽

X Ray Diffraction ◽

X Ray ◽

Maximum Value

In this work, an examination of mining wastes of an albite deposit in south Spain was carried out using X-ray Fluorescence (XRF), X-ray diffraction (XRD), particle size analysis, thermo-dilatometry and Differential Thermal Analysis (DTA) and Thermogravimetric (TG) analysis, followed by the determination of the main ceramic properties. The albite content in two selected samples was high (65–40 wt. %), accompanied by quartz (25–40 wt. %) and other minor minerals identified by XRD, mainly kaolinite, in agreement with the high content of silica and alumina determined by XRF. The content of Na2O was in the range 5.44–3.09 wt. %, being associated with albite. The iron content was very low (<0.75 wt. %). The kaolinite content in the waste was estimated from ~8 to 32 wt. %. The particle size analysis indicated values of 11–31 wt. % of particles <63 µm. The ceramic properties of fired samples (1000–1350 °C) showed progressive shrinkage by the thermal effect, with water absorption and open porosity almost at zero at 1200–1250 °C. At 1200 °C, the bulk density reached a maximum value of 2.38 g/cm3. An abrupt change in the phase evolution by XRD was found from 1150 to 1200 °C, with the disappearance of albite by melting in accordance with the predictions of the phase diagram SiO2-Al2O3-Na2O and the system albite-quartz. These fired materials contained as main crystalline phases quartz and mullite. Quartz was present in the raw samples and mullite was formed by decomposition of kaolinite. The observation of mullite forming needle-shape crystals was revealed by Scanning Electron Microscopy (SEM). The formation of fully densified and vitrified mullite materials by firing treatments was demonstrated.

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Phytochemical and Biological Evaluation of a Newly Designed Nutraceutical Self-Nanoemulsifying Self-Nanosuspension for Protection and Treatment of Cisplatin Induced Testicular Toxicity in Male Rats

Molecules ◽

10.3390/molecules26020408 ◽

2021 ◽

Vol 26 (2) ◽

pp. 408

Author(s):

Sherif R. Abdel-All ◽

Zeinab T. Abdel Shakour ◽

Dalia M. N. Abouhussein ◽

Enji Reda ◽

Thoraya F. Sallam ◽

...

Keyword(s):

Antineoplastic Agent ◽

Biological Evaluation ◽

Particle Size Analysis ◽

Male Rats ◽

Size Analysis ◽

Dilution Method ◽

Tribulus Terrestris ◽

Testicular Toxicity ◽

Transmission Electron ◽

Male Wistar Rats

The incorporation of cisplatin (CP) as a cytotoxic antineoplastic agent in most chemotherapeutic protocols is a challenge due to its toxic effect on testicular tissues. Natural compounds present a promising trend in research, so a new nutraceutical formulation (NCF) was designed to diminish CP spermatotoxicity. A combination of three nutraceutical materials, 250 mg Spirulina platensis powder (SP), 25 mg Tribulus terrestris L. extract (TT), and 100 mg fish oil (FO) were formulated in self-nanoemulsifying self-nanosuspension (SNESNS). SP was loaded into the optimized self-nanoemulsifying system (30% FO, 50% span 80/cremophor EL and 20% isopropanol) and mixed with TT aqueous solution to form SNESNS. For the SP, phytochemical profiling revealed the presence of valuable amounts of fatty acids (FAs), amino acids, flavonoids, polyphenols, vitamins, and minerals. Transmission electron microscopy (TEM) and particle size analysis confirmed the formation of nanoemulsion-based nanosuspension upon dilution. Method validation of the phytochemical constituents in NCF has been developed. Furthermore, NCF was biologically evaluated on male Wistar rats and revealed the improvement of spermatozoa, histopathological features, and biochemical markers over the CP and each ingredient group. Our findings suggest the potential of NCF with SNESNS as a delivery system against CP-induced testicular toxicity in male rats.

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Development of a Solid Dispersion of Nystatin with Maltodextrin as a Carrier Agent: Improvements in Antifungal Efficacy against Candida spp. Biofilm Infections

Pharmaceuticals ◽

10.3390/ph14050397 ◽

2021 ◽

Vol 14 (5) ◽

pp. 397

Author(s):

Carlos Benavent ◽

Carlos Torrado-Salmerón ◽

Santiago Torrado-Santiago

Keyword(s):

Antifungal Activity ◽

Solid Dispersions ◽

Particle Size Analysis ◽

Size Analysis ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

Candida Spp ◽

Microbiological Techniques ◽

Characterization Studies ◽

Candida Albicans Biofilms

The aim of this study was to improve the treatment of Candida albicans biofilms through the use of nystatin solid dispersions developed using maltodextrins as a hyperosmotic carrier. Characterization studies by differential scanning calorimetry, X-ray diffraction, dissolution studies, and particle size analysis were performed to evaluate changes in nystatin crystallinity. Antifungal activity and anti-biofilm efficacy were assessed by microbiological techniques. The results for nystatin solid dispersions showed that the enhancement of antifungal activity may be related to the high proportions of maltodextrins. Anti-biofilm assays showed a significant reduction (more than 80%) on biofilm formation with SD-N:MD [1:6] compared to the nystatin reference suspension. The elaboration process and physicochemical properties of SD-N:MD [1:6] could be a promising strategy for treatment of Candida biofilms.

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