Development of UV Protective Finished Fabric using Herbal Synthesized Colloidal Solution of Silver Nanoparticles

2021 ◽  
Author(s):  
Joyjit Ghosh
Keyword(s):  
Silver Nanoparticles ◽  
Colloidal Solution

scholarly journals A Novel Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. El-Sheikh
Keyword(s):  
Silver Nanoparticles ◽  
Room Temperature ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Water Soluble ◽  
Synthesis Process ◽  
Carboxymethyl Starch ◽  
Round Shape ◽  
First Time

The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride is used for the first time in the synthesis of silver nanoparticles (AgNPs). A new green synthesis method involves using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. A mechanism of the reduction of silver ions to AgNPs by PI/UV system as well as by the newly born aldehydic groups was proposed. The synthesis process was assessed by UV-vis spectra and TEM of AgNPs colloidal solution. The highest absorbance was obtained using CMS, PI and AgNO3concentrations of 10 g/L, 1 g/L, and 1 g/L, respectively; 40°C; 60 min; pH 7; and a material : liquor ratio 1 : 20. AgNPs so-obtained were stable in aqueous solution over a period of three weeks at room temperature (~25°C) and have round shape morphology. The sizes of synthesized AgNPs were in the range of 1–21 nm and the highest counts % of these particles were for particles of 6–10 and 1–3 nm, respectively.

Evaluation of the effect of a colloidal solution of silver nanoparticles on the sowing qualities of wheat seeds

2021 ◽  
Author(s):  
V.V. Keler ◽  
Keyword(s):  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Laboratory Studies ◽  
Seed Productivity ◽  
Wheat Seeds

The article presents the results of laboratory studies to assess the effect of a colloidal solution of silver nanoparticles on the sowing qualities of wheat seeds of the Novosibirsk 15 variety recommended for cultivation in the Krasnoyarsk Territory and an assessment of its effect on seed productivity.

Citrate Stabilized Silver Nanoparticles

2011 ◽  
Vol 3 (3) ◽  
pp. 15-28 ◽  
Author(s):  
Nabraj Bhattarai ◽  
Subarna Khanal ◽  
Pushpa Raj Pudasaini ◽  
Shanna Pahl ◽  
Dulce Romero-Urbina
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Colloidal Solution ◽  
Measurement Techniques ◽  
Structural Defects ◽  
Potential Measurement ◽  
Transmission Electron

Citrate stabilized silver (Ag) colloidal solution were synthesized and characterized for crystallographic and surface properties by using transmission electron microscopy (TEM) and zeta potential measurement techniques. TEM investigation depicted the size of Ago ranges from 5 to 50 nm with smaller particles having single crystal structure while larger particles with structural defects (such as multiply twinned, high coalescence and Moire patterns). ?-potential measurement confirms the presence of Ag+ in nAg stock solution. The shift in ?-potential measurement by +25.1 mV in the filtered solution suggests the presence of Ag+ in Ago nanoparticles.

scholarly journals Green Synthesis of Hydroxyethyl Cellulose-Stabilized Silver Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. El-Sheikh ◽  
S. M. El-Rafie ◽  
E. S. Abdel-Halim ◽  
M. H. El-Rafie
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Colloidal Solution ◽  
Hydroxyethyl Cellulose ◽  
Synthesis Process ◽  
Reaction Conditions ◽  
Oh Groups ◽  
Stabilizing Agents ◽  
Transmission Electron ◽  
Optimum Reaction

Green synthesis aims to minimize the use of unsafe reactants and maximize the efficiency of synthesis process. These could be achieved by using environmentally compassionate polymers and nontoxic chemicals. Hydroxyethyl cellulose (HEC), an ecofriendly polymer, was used as both reducing and stabilizing agents in the synthesis of stable silver nanoparticles, while silver nitrate was used as a precursor and water as a solvent. The formation of silver nanoparticles was assessed by monitoring UV-vis spectra of the silver colloidal solution. The size of the nanoparticles was measured using transmission electron microscope (TEM). Reaction kinetics was followed by measuring the absorbance of silver colloidal solution at different time intervals. Optimum reaction conditions revealed that the highest absorbance was obtained using HEC : AgNO3 of 1.5 : 0.17 (g/100 cm3) at 70°C for 120 min at pH 12. The Ag0 nanoparticles colloidal solution so obtained (1000 ppm) were found stable in aqueous solution over a period of six months at room temperature (°C). The sizes of these nanoparticles were found in the range of 11–60 nm after six months of storing. FTIR spectra confirmed the interaction of both the aldehyde and OH groups in the synthesis and stabilization of silver nanoparticles.

scholarly journals Antibacterial and Wound Healing Activities of Silver Nanoparticles Embedded in Cellulose Compared to Other Polysaccharides and Protein Polymers

2021 ◽  
Author(s):  
Mehran Alavi ◽  
Rajender S. Varma
Keyword(s):  
Thermal Stability ◽  
Wound Healing ◽  
Silver Nanoparticles ◽  
Chronic Wounds ◽  
Colloidal Solution ◽  
Antibacterial Activities ◽  
Wound Dressings ◽  
Future Perspective ◽  
Natural Polymers ◽  
Therapeutic Properties

Abstract The aggregation of silver nanoparticles (AgNPs) in colloidal solution and the oxidative cytotoxicity towards human cells are two major hindrances for their thriving medicinal applications. Their incorporation in natural polymers such as cellulose, chitosan, alginate, collagen, gelatin, silk fibroin, carrageenan, hyaluronic acid, keratin and starch may be an alluring alternative strategy to sidestep these complications and attaining the advantageous wound dressings. Biocompatibility, bioavailability, biodegradability, and inherent therapeutic properties known for theses polymers, would accelerate the healing of infected chronic wounds. However, the low thermal stability, mechanical strength, rapid biodegradation, and weak washing resistance properties are some of the limitations for these polymers. Herein, recent advances, present challenges and future perspective for AgNPs incorporated nanocomposites (NCs) are discussed to realize ideal antibacterial activities by exploiting the abundant natural biopolymers.

Structural Characteristics and Ionic Composition of a Colloidal Solution of Silver Nanoparticles Obtained by Electrical-Spark Discharge in Water

2021 ◽  
Vol 83 (4) ◽  
pp. 448-460
Author(s):  
O. V. Kristavchuk ◽  
A. S. Sohatsky ◽  
V. I. Kozlovskiy ◽  
V. V. Skoi ◽  
A. I. Kuklin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Structural Characteristics ◽  
Ionic Composition ◽  
Spark Discharge

Ultrasonic Characterization of Silver Nanoparticles

2005 ◽  
Vol 23 ◽  
pp. 271-274
Author(s):  
S. Rajagopalan ◽  
S.J. Sharma ◽  
V.Y. Nanotkar
Keyword(s):  
Silver Nanoparticles ◽  
Ultrasonic Velocity ◽  
Colloidal Solution ◽  
Adiabatic Compressibility ◽  
Ammonium Bromide ◽  
Velocity Measurements ◽  
Abnormal Behaviour ◽  
Phase Separations ◽  
Ultrasonic Characterization

Nanoparticles exhibit unusual properties in contrast with their bulk properties due to small particle size and quantum confinement. In the present work, ultrasonic velocity and density measurements have been carried out in solutions of silver nanoparticles in micellar dispersion of cetyl tri-metyl ammonium bromide, CTAB. Ultrasonic velocity measurements at different concentrations of surfactant and temperatures were carried out using Sing-Around technique, operated at 2MHz. It is observed that ultrasonic velocity and adiabatic compressibility show abnormal behaviour with increase in concentration of CTAB in the solution, indicating the existence of the phase separations in nano-colloidal solution.

SERS Study of Alizarin Red Dye on Colloidal Silver Nanoparticles

2009 ◽  
Vol 1241 ◽  
Author(s):  
Raj Kumar Swarnkar ◽  
Subhash Chandra Singh ◽  
Ram Gopal
Keyword(s):  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Pulsed Laser ◽  
Colloidal Silver ◽  
Alizarin Red ◽  
Colloidal Silver Nanoparticles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Red Dye

AbstractThe present paper deals with surface enhanced Raman scattering (SERS) study of an organic dye Alizarin Red on colloidal silver nanoparticles. The colloidal solution of nanoparticles is synthesized by pulsed laser ablation of silver rod in pure deionized water using focused out put of 1064nm wavelength of Nd:YAG laser having 35mJ/ pulse energy. Sodium chloride is used as aggregating agents. It is observed that SERS enhancement factor varies strongly depending on concentration of used aggregating agent (especially on the concentration of Cl- ions). These changes in SERS efficiency of colloid are reflected through changes on the absorption spectra. The possible mechanism of SERS is also discussed.

scholarly journals Colloidal solution of silver nanoparticles for label-free colorimetric sensing of ammonia in aqueous solutions

2018 ◽  
Vol 9 ◽  
pp. 499-507 ◽  
Author(s):  
Alessandro Buccolieri ◽  
Antonio Serra ◽  
Gabriele Giancane ◽  
Daniela Manno
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Morphological Analysis ◽  
Colloidal Solution ◽  
Ammonia Concentration ◽  
Dependent Manner ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Concentration Dependent Manner ◽  
High Ammonia

Silver nanoparticles were synthesized in the presence of saccharides and ammonia (NH3) in the concentration range from 10−2 to 103 ppm to develop an optical sensor for NH3 in aqueous solutions. Ammonia affects the features of the nanoparticles obtained in a concentration-dependent manner as determined by UV–vis absorption analysis and TEM observations. Structural and morphological analysis provides the basis for the production of a colorimetric label-free sensor for ammonia. Overall, surface plasmon resonance increases when ammonia concentration rises, although the functional trend is not the same over the entire investigated ammonia concentration range. Three different ranges have been identified: very low ammonia concentrations from 0.01 to 0.2 ppm, high ammonia concentrations from 20 to 350 ppm and, most importantly, the intermediate or physiological range of ammonia from 0.5 to 10 ppm.

Formation of silver nanoparticles in an acid-catalyzed silica colloidal solution

2004 ◽  
Vol 233 (1-4) ◽  
pp. 135-140 ◽  
Author(s):  
Zhong-Jie Jiang ◽  
Chun-Yan Liu ◽  
Yun Liu
Keyword(s):  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Acid Catalyzed
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