A one-pot method to prepare a ZnO/Ag/polypyrrole composite for zinc alkaline secondary batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 33814-33817 ◽  
Author(s):  
Jianhang Huang ◽  
Zhanhong Yang
Keyword(s):  
Reducing Agent ◽  
Metallic Silver ◽  
Complex Ions ◽  
One Pot ◽  
Ammonia Complex ◽  
Pyrrole Monomer ◽  
Polypyrrole Composite

A ZnO/Ag/polypyrrole (ZAP) composite was synthesized by a facile one-pot method in which silver ammonia complex ions were reduced to metallic silver using a pyrrole monomer as the reducing agent. Meanwhile, the pyrrole monomer was oxidized and formed polypyrrole.

Ethyl Acetate as a Pro-Reducing Agent in an One-Pot Reductive Deamination of Nitroanilines

2004 ◽  
Vol 77 (5) ◽  
pp. 1027-1028 ◽  
Author(s):  
Valeriy A. Bacherikov ◽  
May-Jane Wang ◽  
Shu-Yun Cheng ◽  
Ching-Huang Chen ◽  
Kuo-Tung Chen ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Reducing Agent ◽  
One Pot

scholarly journals Ligand-Free (Z)-Selective Transfer Semihydrogenation of Alkynes Catalyzed by in situ Generated Oxidizable Copper Nanoparticles

2021 ◽  
Author(s):  
Rafał Kusy ◽  
Karol Grela
Keyword(s):  
Suzuki Reaction ◽  
Ammonia Borane ◽  
Water Soluble ◽  
Selective Transfer ◽  
One Pot ◽  
Ammonia Complex ◽  
Ligand Free ◽  
Simple Phase ◽  
Operational Simplicity

Herein, we present (<i>Z</i>)-selective transfer semihydrogenation of alkynes based on in situ generated CuNPs in the presence of hydrogen donors, such as ammonia-borane and a protic solvent. This environmentally-friendly method is characterized by operational simplicity combined with high stereo- and chemoselectivity and functional group compatibility. Auto-oxidation of CuNPs after the semihydrogenation reaction is completed results in the formation of water-soluble ammonia complex, so that the catalyst may be reused several times by simple phase-separation with no need of any special regeneration process. Formed NH<sub>4</sub>B(OR)<sub>4</sub> can be easily transformed back to ammonia-borane or to boric acid. In addition, one-pot tandem sequence involving Suzuki reaction followed by semihydrogenation was presented.<br>

scholarly journals Durable Antimicrobial Behaviour from Silver-Graphene Coated Medical Textile Composites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2000 ◽  
Author(s):  
Nuruzzaman Noor ◽  
Suhas Mutalik ◽  
Muhammad Waseem Younas ◽  
Cheuk Ying Chan ◽  
Suman Thakur ◽  
...  
Keyword(s):  
Soft Matter ◽  
Optical Emission ◽  
Textile Composites ◽  
Reducing Agent ◽  
Metallic Silver ◽  
Silver Nanostructures ◽  
Ion Release ◽  
Electron Microscopic ◽  
Host Matrix ◽  
X Ray

Silver nanoparticle (AgNP) and AgNP/reduced graphene oxide (rGO) nanocomposite impregnated medical grade polyviscose textile pads were formed using a facile, surface-mediated wet chemical solution-dipping process, without further annealing. Surfaces were sequentially treated in situ with a sodium borohydride (NaBH4) reducing agent, prior to formation, deposition, and fixation of Ag nanostructures and/or rGO nanosheets throughout porous non-woven (i.e., randomly interwoven) fibrous scaffolds. There was no need for stabilising agent use. The surface morphology of the treated fabrics and the reaction mechanism were characterised by Fourier transform infrared (FTIR) spectra, ultraviolet-visible (UV–Vis) absorption spectra, X-ray diffraction (XRD), Raman spectroscopy, dynamic light scattering (DLS) energy-dispersive X-ray analysis (EDS), and scanning electron microscopic (SEM). XRD and EDS confirmed the presence of pure-phase metallic silver. Variation of reducing agent concentration allowed control over characteristic plasmon absorption of AgNP while SEM imaging, EDS, and DLS confirmed the presence of and dispersion of Ag particles, with smaller agglomerates existing with concurrent rGO use, which also coincided with enhanced AgNP loading. The composites demonstrated potent antimicrobial activity against the clinically relevant gram-negative Escherichia coli (a key causative bacterial agent of healthcare-associated infections; HAIs). The best antibacterial rate achieved for treated substrates was 100% with only a slight decrease (to 90.1%) after 12 equivalent laundering cycles of standard washing. Investigation of silver ion release behaviours through inductively coupled plasmon optical emission spectroscopy (ICP-OES) and laundering durability tests showed that AgNP adhesion was aided by the presence of the rGO host matrix allowing for robust immobilisation of silver nanostructures with relatively high stability, which offered a rapid, convenient, scalable route to conformal NP–decorated and nanocomposite soft matter coatings.

scholarly journals Magnetic γFe2O3@Sh@Cu2O: an efficient solid-phase catalyst for reducing agent and base-free click synthesis of 1,4-disubstituted-1,2,3-triazoles

BMC Chemistry ◽  
2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Fereshteh Norouzi ◽  
Shahrzad Javanshir
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Click Reaction ◽  
Copper Acetate ◽  
Reducing Agent ◽  
Gravimetric Analysis ◽  
High Turnover ◽  
One Pot ◽  
X Ray

AbstractA hybrid magnetic material γFe2O3@Sh@cu2O was easily prepared from Shilajit (Sh) decorated Fe3O4 and copper acetate. The prepared magnetic hybrid material was fully characterized using different analysis, including Fourier transform infrared (FT-IR), X-ray diffraction (XRD), inductively coupled plasma (ICP), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) thermal gravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET). All these analysis revealed that during coating of Fe3O4@Sh using copper salt (II), synchronized redox sorption of CuII to CuI occurs at the same time as the oxidation of Fe3O4 to γFe2O3. This magnetic catalyst exhibited excellent catalytic activity for regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles via one pot three-component click reaction of sodium azide, terminal alkynes and benzyl halides in the absence of any reducing agent. High yields, short reaction time, high turnover number and frequency (TON = 3.5 * 105 and TOF = 1.0 * 106 h−1 respectively), easy separation, and efficient recycling of the catalyst are the strengths of the present method.

One-pot synthesis of CuFeO2 nanoparticles capped with glycerol and proteomic analysis of their nanocytotoxicity against fungi

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97629-97635 ◽  
Author(s):  
Hani Nasser Abdelhamid ◽  
Sekar Kumaran ◽  
Hui-Fen Wu
Keyword(s):  
Proteomic Analysis ◽  
Reducing Agent ◽  
One Pot ◽  
One Pot Synthesis

One-pot synthesis of cuprous ferrite (CuFeO2) nanoparticles modified with glycerol (glycerol@CuFeO2 NPs) using oligol and reducing agent was reported.

One-pot high-yield synthesis of single-crystalline gold nanorods using glycerol as a low-cost and eco-friendly reducing agent

2015 ◽  
Vol 17 (10) ◽  
Author(s):  
Rashida Parveen ◽  
Janaina F. Gomes ◽  
Sajjad Ullah ◽  
José J. S. Acuña ◽  
Germano Tremiliosi-Filho
Keyword(s):  
Gold Nanorods ◽  
Low Cost ◽  
Reducing Agent ◽  
High Yield ◽  
One Pot ◽  
Single Crystalline

scholarly journals Facile and One Pot Synthesis of Gold Nanoparticles Using Tetraphenylborate and Polyvinylpyrrolidone for Selective Colorimetric Detection of Mercury Ions in Aqueous Medium

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sidhureddy Boopathi ◽  
Shanmugam Senthilkumar ◽  
Kanala Lakshminarasimha Phani
Keyword(s):  
Gold Nanoparticles ◽  
Alkaline Medium ◽  
Color Change ◽  
Colorimetric Detection ◽  
Spherical Shape ◽  
Reducing Agent ◽  
Nanoparticle Dispersion ◽  
Mercury Ions ◽  
One Pot ◽  
Resonance Band

In this work, we reported for the first time, a facile and one step synthesis of gold nanoparticles from HAuCl4, employing tetraphenylborate as the reducing agent. The synthesis is not only facile but also yields “dumb-bell-shaped”particles. This shape appears to arise from a possible emulsion of the products of oxidation/decomposition of tetraphenylborate by HAuCl4, surrounding the particle. The size and shape of the AuNPs were characterized by Transmission electron microscopy (TEM) and UV-visible Spectroscopy. Interestingly, the addition of polyvinylpyrrolidone (PVP) during the synthesis was found to enhance the stability of the nanoparticle dispersion. The particles synthesized under these conditions assume “spherical” shape with the appearance of only transverse surface plasmon resonance band. The highlight of the observations is that the gold nanoparticles synthesized using tetraphenylborate as reducing agent and PVP as stabilizer are highly stable in alkaline medium, in contrast to the synthesis wherein borohydride is used as reducing agent. The AuNPs synthesized using tetraphenylborate and PVP show their mercury sensing behavior only in the alkaline medium. The color of the nanoparticle dispersion undergoes distinct color change from pink to blue with the addition of mercury ions. They also show dramatic selectivity to mercury ions in presence of other interfering ions, Pb2+, Zn2+and Ca2+.

Transformation of an Acid Dipyrromethane into its Formyl Dipyrromethane without Decarboxylation

1998 ◽  
Vol 02 (04) ◽  
pp. 295-304 ◽  
Author(s):  
DENNIS H. BURNS ◽  
MICHAEL W. BURDEN ◽  
YUE HU LI
Keyword(s):  
Acid Chloride ◽  
Oxalyl Chloride ◽  
Reducing Agent ◽  
Acyl Chloride ◽  
One Pot ◽  
Sodium Triacetoxyborohydride

A method for the preparation of an α-formylated pyrrole or dipyrromethane which contains an electron-withdrawing β-acetyl is described. Formylation proceeds directly from the corresponding acid pyrrole or dipyrromethane without the need of the usual two-step acid decarboxylation/formylation procedure. The acid is first transformed into its acid chloride with oxalyl chloride, followed by reduction to the aldehyde with the mild reducing agent sodium triacetoxyborohydride, in a one-pot reaction. The non-basic acylating reagent PR 3 is necessary both for acyl chloride formation and for the reduction to succeed.

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