scholarly journals One-step green approach for functional printing and finishing of textiles using silver and gold NPs

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25546-25557 ◽  
Author(s):  
T. Abou Elmaaty ◽  
Kh. El-Nagare ◽  
S. Raouf ◽  
Kh. Abdelfattah ◽  
S. El-Kadi ◽  
...  
Keyword(s):  
Cotton Fabrics ◽  
Ag Nps ◽  
Gold And Silver Nanoparticles ◽  
Simple Method ◽  
Au Nps ◽  
Green Approach ◽  
Functional Printing ◽  
One Step ◽  
Gold Nps ◽  
Functional Components

In this study, we present a successful simple method for printing and finishing of polyester and cotton fabrics using gold and silver nanoparticles (Au-NPs and Ag-NPs, respectively) as stable, fast colorants and functional components.

scholarly journals Green approach in gold, silver and selenium nanoparticles using coffee bean extract

2020 ◽  
Vol 5 (1) ◽  
pp. 761-767
Author(s):  
Reiyhaneh Abbasian ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Spherical Shape ◽  
Coffee Bean ◽  
Hydrothermal Conditions ◽  
Ag Nps ◽  
Au Nps ◽  
Stabilizing Agents ◽  
E Coli ◽  
Green Approach ◽  
Gold Silver ◽  
Ft Ir

AbstractGreen fabrication of metal nanoparticles (NPs), using natural reducing and stabilizing agents existed in plants and their derivatives, due to their unique properties, has gained more attention. The present study focuses on the synthesis of gold (Au), silver (Ag) and selenium (Se) NPs using coffee bean extract under hydrothermal conditions (1.5 atm and 121°C, for 15 min). Coffee bean extract obtained in 2 h processing using Clevenger apparatus and Fourier transform-infrared (FT-IR) spectroscopy indicated five highlighted peaks, namely, hydroxyl, amide, aromatic, alkane and ring groups. Dynamic light scattering analysis revealed that among three different NPs formed, fabricated Ag NPs had small particle size (153 nm) and high zeta potential value (16.8 mV). However, synthesized Au NPs had minimum polydispersity index (0.312). Results also indicated that fabricated Au, Se and Ag NPs had low antioxidant activity with values of 9.1, 8.9 and 8.7%, respectively. Morphological and antibacterial activity assessments, demonstrated that synthesized Ag, Au and Se NPs had spherical shape and high bactericidal activity against E. coli and S. aurous. Obtained results indicated that the synthesized NPs, can be utilized in various areas.

scholarly journals Rapid formation methods of arrays of randomly distributed Au and Ag nanoparticles, their morphologies and optical characteristics

2021 ◽  
Vol 22 (4) ◽  
pp. 804-810
Author(s):  
V.M. Rubish ◽  
V.K. Kyrylenko ◽  
M.O. Durkot ◽  
L.I. Makar ◽  
M.M. Pop ◽  
...  
Keyword(s):  
Radiation Heating ◽  
Ag Nps ◽  
Rapid Radiation ◽  
Au Nps ◽  
Glass Substrates ◽  
Sers Substrates ◽  
Rapid Formation ◽  
Gold Nps ◽  
Average Size ◽  
Nanoparticle Sizes

By the method of rapid radiation heating (at a speed of 20-25 K/s) of Au and Ag films with a thickness of 4-35 nm to temperatures of 573-693 K in air and in the process of vacuum deposition of silver on heated (up to 700 K at a heating rate of 10 K/s ) glass substrates formed Au and Ag NPs arrays with nanoparticle sizes from several tens to hundreds of nanometers, the position λSPR of which is in the range of 520-597 nm for Au NPs and 424-509 nm for Ag NPs. It is established that the average size of nanoparticles depends on the thickness of gold and silver films and the annealing temperature. The results testify that glass substrates with arrays of randomly distributed gold NPs can be used as effective SERS-substrates for the investigation of Raman spectra of nanosized (50-100 nm) chalcogenide films.

Doping Concentration Tuning and Plasmonic Optical Properties Modelling of Metal Nano Particles Utilizing FDTD Method

2020 ◽  
Vol 995 ◽  
pp. 197-202
Author(s):  
Mehran Rafiee ◽  
Subhash Chandra ◽  
Hind Ahmed ◽  
Aaron Glenn ◽  
Conor Mc Loughlin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Doping Concentration ◽  
Radiative Decay ◽  
Fdtd Method ◽  
Nano Particles ◽  
Noble Metal Nanoparticles ◽  
Field Energy ◽  
Ag Nps ◽  
Gold And Silver Nanoparticles ◽  
Au Nps

Among noble metal nanoparticles (MNPs), plasmonic effect of gold and silver nanoparticles (Au NPs and Ag NPs) is interesting to study due to their high near-field energy. This makes them excellent particles to absorb and scatter incident radiation in optical applications such as coupling them to fluorescent emitters to enhance their radiative decay and emission rate. This paper reviews and studies the methodology required for tuning the doping concentration and modelling plasmonic optical properties of Au NPs and Ag NPs by using finite difference time domain (FDTD) method. The frequency-dependent optical behaviour of MNPs is discussed. Plasmonic optical properties of MNPs can be characterised by their dimension, shape and doping concentration. Dimension and shape of MNPs can be simply defined in FDTD space grid (known as Yee grid). However, tuning MNPs doping concentration is more challenging which is undertaken by changing the spacing between MNPs and lateral boundaries of FDTD Yee grid. This can be vastly useful in Au NPs and Ag NPs optical optimization and applications to estimate plasmonic resonance based on doping concentration of particles.

One step hydrothermal green approach of CuO/Ag nanocomposites: analysis of structural, biological activities

2019 ◽  
Vol 6 (9) ◽  
pp. 095036 ◽  
Author(s):  
E Nandhakumar ◽  
P Priya ◽  
P Selvakumar ◽  
E Vaishnavi ◽  
A Sasikumar ◽  
...  
Keyword(s):  
Biological Activities ◽  
Green Approach ◽  
One Step

State-of-art of silver and gold nanoparticles synthesis routes, characterization and applications: a review

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Faisal Ali ◽  
Muhammad Hamza ◽  
Munawar Iqbal ◽  
Beriham Basha ◽  
Norah Alwadai ◽  
...  
Keyword(s):  
Electron Microscope ◽  
X Rays ◽  
Ag Nps ◽  
Au Nps ◽  
Advantages And Disadvantages ◽  
Transmission Electron ◽  
Synthesis Properties ◽  
Synthesis Routes ◽  
Synthesis Approach ◽  
Comprehensive Study

Abstract To date, the noble metal-based nanoparticles have been used in every field of life. The Au and Ag nanoparticles (NPs) have been fabricated employing different techniques to tune the properties. In this study, the methodologies developed and adopted for the fabrication of Au and Ag have been discussed, which include physical, chemical and biological routes. The Au and Ag characteristics (morphology, size, shape) along with advantages and disadvantages are discussed. The Au and Ag NPs catalytic and biomedical applications are discussed. For the Ag and Au NPs characterization, SEM (scanning electron microscope), TEM (transmission electron microscope), FTIR (Fourier transform infra-red spectroscopy), XRD (X-rays diffraction) and DLS (dynamic light scattering) techniques are employed. The properties of Au and Ag NPs found dependent to synthesis approach, i.e., the size, shape and morphologies, which showed a promising Catalytic, drug delivery and antimicrobial agent applications. The review is a comprehensive study for the comparison of Au and Ag NPs synthesis, properties and applications in different fields.

One Step Thermochromic Pigment Printing and Ag NPs Antibacterial Functional Finishing of Cotton and Cotton/PET Fabrics

2018 ◽  
Vol 19 (11) ◽  
pp. 2317-2323 ◽  
Author(s):  
Tarek Abou Elmaaty ◽  
Shaimaa M. Ramadan ◽  
Sally M. Nasr Eldin ◽  
Gehan Elgamal
Keyword(s):  
Ag Nps ◽  
One Step ◽  
Thermochromic Pigment

scholarly journals Compact Tri-band Bandpass Filter Based on Asymmetric Step Impedance Resonators for WiMAX and RFID Systems

2021 ◽  
Vol 21 (4) ◽  
pp. 316-321
Author(s):  
Abdul Basit ◽  
Muhammad Irfan Khattak ◽  
Ayman Althuwayb ◽  
Jamel Nebhen
Keyword(s):  
Radio Frequency Identification ◽  
Bandpass Filter ◽  
Coupled Resonators ◽  
Simple Method ◽  
Rfid Systems ◽  
Fundamental Frequencies ◽  
Half Wavelength ◽  
Frequency Identification ◽  
One Step ◽  
Rfid Applications

In this article, a simple method is developed to design a highly miniaturized tri-band bandpass filter (BPF) utilizing two asymmetric coupled resonators with one step discontinuity and one uniform impedance resonator (UIR) for worldwide interoperability for microwave access (WiMAX) and radio frequency identification (RFID) applications. The first and second passbands located at 3.7 GHz and 6.6 GHz are achieved through two asymmetric coupled step impedance resonators (SIRs), while the third passband, centered at 9 GHz, is achieved using a half-wavelength UIR, respectively. The fundamental frequencies of this BPF are implemented by tuning the physical length ratio (α) and impedance ratio (R) of the asymmetric SIRs. The proposed filter is designed and fabricated with a circuit dimension of 13.69 mm × 25 mm (0.02 λg × 0.03 λg), where λg represents the guided wavelength at the first passband. The experimental and measured results are provided with good matching.

scholarly journals One-Step Surface Immobilization of Protein A on Hydrogel Nanofibers by Core-Shell Electrospinning for Capturing Antibodies

2021 ◽  
Vol 22 (18) ◽  
pp. 9857
Author(s):  
Chihiro Naganuma ◽  
Kosuke Moriyama ◽  
Shin-ichiro Suye ◽  
Satoshi Fujita
Keyword(s):  
Protein A ◽  
Core Shell ◽  
Aqueous Environment ◽  
High Porosity ◽  
Surface Immobilization ◽  
Affinity Separation ◽  
Simple Method ◽  
Complex Processes ◽  
One Step ◽  
Fiber Sheet

Nanofibers (NFs) are potential candidates as filter materials for affinity separation owing to their high liquid permeability based on their high porosity. Multiple and complex processes were conventionally performed to immobilize proteins for modifying NF surfaces. A simple method must be developed to immobilize proteins without impairing their biological activity. Herein, we succeeded in fabricating NFs with a core of cellulose acetate and a shell of hydrophilic polyvinyl alcohol immobilized with staphylococcal recombinant protein A by a one-step process based on core-shell electrospinning. A total of 12.9 mg/cm3 of antibody was captured in the fiber shell through high affinity with protein A immobilized in an aqueous environment of the hydrogel. The maximum adsorption site and dissociation constant evaluated by the Langmuir model were 87.8 µg and 1.37 µmol/L, respectively. The fiber sheet withstood triplicate use. Thus, our NF exhibited high potential as a material for membrane chromatography.

One-step integration of a multiple-morphology gold nanoparticle array on a TiO2filmviaa facile sonochemical method for highly efficient organic photovoltaics

2018 ◽  
Vol 6 (18) ◽  
pp. 8419-8429 ◽  
Author(s):  
Weijing Shao ◽  
Zhiqiang Liang ◽  
Tianfu Guan ◽  
Jianmei Chen ◽  
Zhifang Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Absorption Band ◽  
Gold Nanoparticle ◽  
Organic Photovoltaics ◽  
Device Performance ◽  
Sonochemical Method ◽  
Nanoparticle Array ◽  
Au Nps ◽  
Highly Efficient ◽  
One Step

Well-dispersed Au NPs arrays with multiple morphology are integrated on a TiO2thin filmviaa facile sonochemical approach, which exhibit a broadened absorption band, and enable a noticeable enhancement in device performance of organic photovoltaics.

Sign in / Sign up

Export Citation Format

Share Document