scholarly journals Nanoparticle induced formation of self-assembled zwitterionic surfactant microdomains which mimic microemulsions for the in situ fabrication and dispersion of silver nanoparticles

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 34161-34166
Author(s):  
Taichi Nakagawa ◽  
Akihide Hibara ◽  
Willie L. Hinze ◽  
Yoshitaka Takagai
Keyword(s):  
Silver Nanoparticles ◽  
Zwitterionic Surfactant ◽  
Ag Nps ◽  
In Situ Fabrication ◽  
Self Assembled

The illustration of the mechanism of fabrication of dispersive microemulsion enclosing Ag-NPs.

In situ fabrication of self-assembled BiOBrxI1−x coated on carbon nanofibers for efficient solar light-driven photocatalytic nitrogen fixation

2020 ◽  
Vol 4 (12) ◽  
pp. 6196-6202
Author(s):  
Chenghe Hua ◽  
Xiaoli Dong ◽  
Nan Zheng ◽  
Xinxin Zhang ◽  
Mang Xue
Keyword(s):  
Nitrogen Fixation ◽  
Carbon Nanofibers ◽  
Carbon Nanofiber ◽  
Solar Light ◽  
In Situ Fabrication ◽  
Composite Photocatalysts ◽  
Self Assembled

BiOBrxI1−x composite photocatalysts have been successfully deposited on carbon nanofiber (CNF) substrates via two steps.

Core–Shell γ-Fe2O3/SiO2/PCA/Ag-NPs Hybrid Nanomaterials as a New Candidate for Future Cancer Therapy

2014 ◽  
Vol 13 (01) ◽  
pp. 1450008 ◽  
Author(s):  
R. Soleyman ◽  
A. Pourjavadi ◽  
N. Masoud ◽  
A. Varamesh
Keyword(s):  
Silver Nanoparticles ◽  
Cancer Therapy ◽  
Silver Ions ◽  
Core Shell ◽  
Capping Agent ◽  
Hybrid Nanomaterials ◽  
Ag Nps ◽  
Core Nanoparticles ◽  
Size And Structure

In the current study, γ- Fe 2 O 3/ SiO 2/ PCA / Ag -NPs hybrid nanomaterials were successfully synthesized and characterized. At first, prepared γ- Fe 2 O 3 core nanoparticles were modified by SiO 2 layer. Then they were covered by poly citric acid (PCA) via melting esterification method as well. PCA shell acts as an effective linker, and provides vacancies for conveying drugs. Moreover, this shell as an effective capping agent directs synthesis of silver nanoparticles ( Ag -NPs) via in situ photo-reduction of silver ions by sunlight-UV irradiation. This system has several benefits as a suitable cancer therapy nanomaterial. Magnetic nanoparticles (MNPs) can guide Ag -NPs and drugs to cancer cells and then Ag -NPs can affect those cells via Ag -NPs anti-angiogenesis effect. Size and structure of the prepared magnetic hybrid nanomaterials were characterized using FTIR and UV-Vis spectra, AFM and TEM pictures and XRD data.

Catechol End-Functionalized Polysarcosine for In-situ Synthesis and Stabilization of Silver Nanoparticles

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1113-1120
Author(s):  
Hailemariam Gebru ◽  
Zhenjiang Li
Keyword(s):  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
In Situ Synthesis ◽  
High Concentration ◽  
Ag Nps ◽  
Sem Images ◽  
Stabilizing Agents ◽  
H Nmr ◽  
Dopamine Hydrochloride

ABSTRACTFunctional polymers were previously employed to minimize the susceptibility of metallic nanoparticles (MNPs) for aggregation. Herein, we intended to conjugate catechol moiety into the polymer chain end considering its anchoring ability to virtually most surfaces. Accordingly, catechol end-functionalized polysarcosine (cat-PSar) was successfully prepared from the ring-opening polymerization (ROP) of sarcosine N-carboxyanhydrides (Sar-NCA) using dopamine hydrochloride initiator. ROP of Sar-NCA was carried out at different monomer to initiator feed ratios. The molecular structure of cat-PSar was confirmed by 1H NMR and MALDITOF. Afterward, the obtained catechol functionalized polymer was used for in-situ synthesis and stabilization of silver nanoparticles (Ag-NPs) in aqueous solution. The observed characteristic absorption peak at λmax of 415 nm indicates the formation of Ag-NPs. Scanning electron microscope (SEM) images also elucidate the formation of Ag-NPs with the relatively small sizes of the nanocomposite at a high concentration of silver nitrate. Hence, biomimetic polymers could play a dual role as reducing and stabilizing agents in the preparation of monodispersed MNPs.

scholarly journals Silver nanoparticles sintering at low temperature on a copper substrate: In situ characterization under inert atmosphere and air

2012 ◽  
Vol 48 (1) ◽  
pp. 63-71 ◽  
Author(s):  
J. Sopousek ◽  
J. Bursik ◽  
J. Zalesak ◽  
Z. Pesina
Keyword(s):  
Silver Nanoparticles ◽  
Low Temperature ◽  
Copper Substrate ◽  
Simultaneous Thermal Analysis ◽  
Inert Atmosphere ◽  
Ag Nps ◽  
Scanning Calorimetry ◽  
External Conditions ◽  
Wet Synthesis

Silver nanoparticles (Ag-NPs) were prepared by wet synthesis. The Ag-NPs suspension and the copper substrate plate were used for a preparation of substrate-nanoparticle-substrate samples. The sandwich like samples Cu/Ag/Cu were prepared and investigated in-situ at the isothermal external conditions (IEC) and inside apparatus for simultaneous thermal analysis STA409 (DSC). The in-situ results of the electrical resistance were recorded during the Cu/Ag/Cu (IEC) sample preparation and heat treatment. Thermal effects of the Ag-NPs sintering between copper substrates were measured by differential scanning calorimetry (DSC) under different atmospheres. The prepared Cu/Ag/Cu sandwich samples were characterised by means of both optical and electron microscopy. The process of the low temperature sintering inside calorimeter of the Ag-NPs was monitored using both thermogravimetry (TG) and DSC technique under inert gas and under synthetic air. The exothermic heat effect of nanosilver sintering was evaluated.

In situ fabrication of single-crystalline porous ZnO nanoplates on zinc foil to support silver nanoparticles as a stable SERS substrate

CrystEngComm ◽  
2012 ◽  
Vol 14 (18) ◽  
pp. 6023 ◽  
Author(s):  
Heng Yang ◽  
Shou-Qing Ni ◽  
Xiaohong Jiang ◽  
Wei Jiang ◽  
Jinhua Zhan
Keyword(s):  
Silver Nanoparticles ◽  
Sers Substrate ◽  
Single Crystalline ◽  
In Situ Fabrication

scholarly journals In-Situ Biofabrication of Silver Nanoparticles in Ceiba pentandra Natural Fiber Using Entada spiralis Extract with Their Antibacterial and Catalytic Dye Reduction Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1104 ◽  
Author(s):  
Wan Khaima Azira Wan Mat Khalir ◽  
Kamyar Shameli ◽  
Seyed Davoud Jazayeri ◽  
Nor Azizi Othman ◽  
Nurfatehah Wahyuny Che Jusoh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Natural Fiber ◽  
Ag Nps ◽  
X Ray ◽  
Ceiba Pentandra ◽  
Dye Reduction ◽  
Scanning Electron

It is believed of great interest to incorporate silver nanoparticles (Ag-NPs) into stable supported materials using biological methods to control the adverse properties of nanoscale particles. In this study, in-situ biofabrication of Ag-NPs using Entada spiralis (E. spiralis) aqueous extract in Ceiba pentandra (C. pentandra) fiber as supporting material was used in which, the E. spiralis extract acted as both reducing and stabilizing agents to incorporate Ag-NPs in the C. pentandra fiber. The properties of Ag-NPs incorporated in the C. pentandra fiber (C. pentandra/Ag-NPs) were characterized using UV-visible spectroscopy (UV-vis), X-ray Diffraction (XRD), Field Emission Transmission Electron Microscope (FETEM), Scanning Electron Microscope (Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX), Brunauer-Emmett-Teller (BET), Thermogravimetric (TGA) and Fourier Transform Infrared (FTIR) analyses. The average size of Ag-NPs measured using FETEM image was 4.74 nm spherical in shape. The C. pentandra/Ag-NPs was easily separated after application, and could control the release of Ag-NPs to the environment due to its strong attachment in C. pentandra fiber. The C. pentandra/Ag-NPs exposed good qualitative and quantitative antibacterial activities against Staphylococcus aureus (ATCC 25923), Enterococcus faecalis (ATCC 29212), Escherichia coli (ATCC 25922) and Proteus vulgaris (ATCC 33420). The dye catalytic properties of C. pentandra/Ag-NPs revealed the dye reduction time in which it was completed within 4 min for 20 mg/L rhodamine B and 20 min for 20 mg/L methylene blue dye, respectively. Based on the results, it is evident that C. pentandra/Ag-NPs are potentially promising to be applied in wound healing, textile, wastewater treatment, food packaging, labeling and biomedical fields.

scholarly journals In Situ Reduction of Silver Nanoparticles on the Plasma-Induced Chitosan Grafted Polylactic Acid Nonwoven Fabrics for Improvement of Antibacterial Activity

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1517
Author(s):  
Yu Ren ◽  
Tingyue Fan ◽  
Xiaona Wang ◽  
Yongyin Guan ◽  
Long Zhou ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Polylactic Acid ◽  
Antibacterial Properties ◽  
In Situ Reduction ◽  
Ag Nps ◽  
X Ray ◽  
Nonwoven Fabrics ◽  
Uniform Dispersion

An eco-friendly approach for improvement of antibacterial properties of polylactic acid (PLA) nonwoven fabrics was obtained by in situ reduction of silver nanoparticles (Ag NPs) on dielectric barrier discharge (DBD) plasma-induced chitosan grafted (DBD-CS-Ag NPs) PLA nonwoven fabrics. The surface morphology, surface element composition and the chemical state of silver of the PLA surfaces after the treatment were evaluated through scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. The antibacterial activity of DBD-CS-Ag NPs treated PLA against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) was tested. The uniform dispersion of silver nanoparticles on the DBD-CS-Ag NPs treated PLA surface were confirmed by SEM images. The results of XPS and XRD showed that the concentration of silver element on the surface of PLA nonwoven fabrics was significantly improved after DBD-CS-Ag NPs treatment. The DBD-CS-Ag NPs treated PLA nonwoven fabrics also exhibited excellent antibacterial properties.

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