The surface adsorption, aggregate structure and antibacterial activity of Gemini quaternary ammonium surfactants with carboxylic counterions

A group of Gemini quaternary ammonium surfactants with the formula C n H 2 n +1 CONH(CH 2 ) 2 N + (CH 3 ) 2 (CH 2 ) 2 N + (CH 3 ) 2 (CH 2 ) 2 NHCOC n H 2 n +1 · 2Y ( n = 11, 13 and 15, Y = HCOO − , CH 3 COO − and CH 3 CHOHCOO − ) have been synthesized by a counterion conversion process and characterized by Fourier transform infrared spectroscopy and mass spectroscopy. Their adsorption and self-aggregation properties are investigated by surface tension, conductivity, dynamic light scattering and transmission electron microscopy (TEM) measurements. The results show that these surfactants reduce the surface tension of water to a minimum value of 26.51 mN m −1 at a concentration of 5.72 × 10 −2 mmol l −1 . Furthermore, the increased alkyl chain length of the carboxylic counterions leads to the increased critical micelle concentration, the decreased degree of counterion binding ( β ) and the decreased self-assembly tendency, but the minimum area per surfactant molecule ( A min ) adsorbed at the air–aqueous solution are similar. TEM images reveal that these surfactants self-assemble spontaneously into aggregates with vesicle or bilayer structures. It is also found that they have superior antibacterial activity at a concentration of 0.1 g l −1 . The high surface activity and high antibacterial activity of the Gemini quaternary ammonium salt surfactants containing different carboxylic counterions bring more possibilities for the application in the field of biomedicine.

Download Full-text

Antimicrobial Activity of O-Carboxymethyl Chitosan Nanofibers Containing Silver Nanoparticles Synthesized by Green Method

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.40.136 ◽

2016 ◽

Vol 40 ◽

pp. 136-145 ◽

Cited By ~ 1

Author(s):

Metwally Ezzat ◽

Mohammed Ghanim ◽

Hassan Nageh ◽

Ahmed H. Hassanin ◽

Ahmed Abdel-Moneim

Keyword(s):

Antibacterial Activity ◽

Wound Dressing ◽

Pathogenic Bacteria ◽

Reaction Times ◽

Carboxymethyl Chitosan ◽

Diffusion Method ◽

Ag Nps ◽

High Antibacterial Activity ◽

Transmission Electron ◽

Bacteria And Fungi

New green synthesis of Ag-nanoparticles (Ag-NPs) using O-Carboxymethyl Chitosan (O-CMCs) as stabilizing agent and ascorbic acid as reducing agent was achieved. The reaction was carried out in an autoclave at a pressure of 0.12 MPa and a temperature of 120°C at varying concentrations of solution precursors and different reaction times. The size, shape and structure of Ag-NPs were measured using transmission electron microscope (TEM), X-Ray Diffraction (XRD), FT-IR and UV spectrophotometers. The Ag-NPs stabilized in O-CMCs were blended with polyvinyl alcohol (PVA) polymer solution and then electrospun to produce wound dressing nanofibers with high antibacterial activity. The morphological study of O-CMCs/ PVA/Ag-NPs nanofiber membranes was characterized using SEM. Finally, the release behavior of Ag-NPs from these nanofibers was examined and the antibacterial activity was measured against some skin pathogenic bacteria and fungi using the agar diffusion method. The newly developed membranes show a unique antibacterial activity against the tested strains and were presented as promising active wound dressing materials in medical applications.

Download Full-text

Synthesis and properties of quaternary ammonium surfactants containing a methoxy benzyl substitute

RSC Advances ◽

10.1039/c4ra07363k ◽

2014 ◽

Vol 4 (100) ◽

pp. 56918-56925 ◽

Cited By ~ 11

Author(s):

Zhenlong Zhao ◽

Xiangfeng Guo ◽

Lihua Jia ◽

Yanyan Liu

Keyword(s):

Surface Activity ◽

Thermodynamic Functions ◽

Quaternary Ammonium ◽

High Surface ◽

Quaternary Ammonium Surfactants ◽

High Surface Activity

m-MDRA-n exhibit high surface activity, excellent adsorptive and bacterial properties, thermodynamic functions of micellization for m-MDRA-n were researched.

Download Full-text

Imaging of carbon nanomembranes with helium ion microscopy

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.6.175 ◽

2015 ◽

Vol 6 ◽

pp. 1712-1720 ◽

Cited By ~ 18

Author(s):

André Beyer ◽

Henning Vieker ◽

Robin Klett ◽

Hanno Meyer zu Theenhausen ◽

Polina Angelova ◽

...

Keyword(s):

Self Assembly ◽

High Surface ◽

Charge Compensation ◽

Depth Of Field ◽

Free Standing ◽

Transmission Electron ◽

Helium Ion ◽

Assembled Monolayers ◽

Efficient Charge ◽

Radiation Induced

Carbon nanomembranes (CNMs) prepared from aromatic self-assembled monolayers constitute a recently developed class of 2D materials. They are made by a combination of self-assembly, radiation-induced cross-linking and the detachment of the cross-linked SAM from its substrate. CNMs can be deposited on arbitrary substrates, including holey and perforated ones, as well as on metallic (transmission electron microscopy) grids. Therewith, freestanding membranes with a thickness of 1 nm and macroscopic lateral dimensions can be prepared. Although free-standing CNMs cannot be imaged by light microscopy, charged particle techniques can visualize them. However, CNMs are electrically insulating, which makes them sensitive to charging. We demonstrate that the helium ion microscope (HIM) is a good candidate for imaging freestanding CNMs due to its efficient charge compensation tool. Scanning with a beam of helium ions while recording the emitted secondary electrons generates the HIM images. The advantages of HIM are high resolution, high surface sensitivity and large depth of field. The effects of sample charging, imaging of multilayer CNMs as well as imaging artefacts are discussed.

Download Full-text

Preparation of Novel Gemini Quaternary Ammonium Salt Cationic Surfactant

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.1433 ◽

2012 ◽

Vol 174-177 ◽

pp. 1433-1436 ◽

Cited By ~ 3

Author(s):

Zong Cheng Miao ◽

Fang Wang ◽

Deng Deng ◽

Yong Ming Zhang ◽

Xiao Ping Huo ◽

...

Keyword(s):

Surface Tension ◽

Ammonium Chloride ◽

Cationic Surfactant ◽

Ammonium Salt ◽

Quaternary Ammonium ◽

Quaternary Ammonium Salt ◽

Foam Stability ◽

High Surface ◽

Amine Hydrochloride ◽

Gemini Cationic Surfactant

In order to obtain some novel cationic surfactants with high surface activity, n-octadecyldimethylamine and epichlorohydrin were used to synthesize 2-hydroxy-1, 3-dis (chloride octadecyl dimethyl ammonium) propane, which was a kind of gemini quaternary ammonium salt. N-octadecyldimethylamine and epichlorohydrin were used to prepare active epoxy intermediate glycidyloctadecyldimethyl ammonium chlorided, and then glycidyloctadecyldimethyl ammonium chlorided was reacted with octadecyldimethyl amine hydrochloride to synthesize the gemini cationic surfactant. FTIR and 1H NMR were used to represent structure of the gemini cationic surfactant. The interface characteristics were studied in detail. The critical micellar concentration (CMC) was determined by surface tension test to obtain the values of CMC and surface tension at CMC. The foam ability and foam stability of the gemini cationic surfactant were also discussed through contrast octadecyltrimethyl ammonium chloride and cetyltrimethyl ammonium chloride.

Download Full-text

Evaluation of Samarium Doped Hydroxyapatite, Ceramics for Medical Application: Antimicrobial Activity

Journal of Nanomaterials ◽

10.1155/2015/849216 ◽

2015 ◽

Vol 2015 ◽

pp. 1-11 ◽

Cited By ~ 27

Author(s):

C. S. Ciobanu ◽

S. L. Iconaru ◽

C. L. Popa ◽

M. Motelica-Heino ◽

D. Predoi

Keyword(s):

Electron Microscopy ◽

Antimicrobial Activity ◽

Antibacterial Activity ◽

Enterococcus Faecalis ◽

Medical Application ◽

Inhibitory Effect ◽

Linear Increase ◽

High Antibacterial Activity ◽

Hydroxyapatite Ceramics ◽

Transmission Electron

Samarium doped hydroxyapatite (Sm:HAp),Ca10-xSmx(PO4)6(OH)2(HAp), bionanoparticles with differentxSmhave been successfully synthesized by coprecipitation method. Detailed characterization of samarium doped hydroxyapatite nanoparticles (Sm:HAp-NPs) was carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). The biocompatibility of samarium doped hydroxyapatite was assessed by cell viability. The antibacterial activity of the Sm:HAp-NPs was tested against Gram-negative bacteria (Pseudomonas aeruginosaandEscherichia coli) and Gram-positive bacteria (Enterococcus faecalisandStaphylococcus aureus). A linear increase of antimicrobial activity ofP. aeruginosahas been observed when concentrations of Sm:HAp-NPs in the samples withxSm=0.02were higher than 0.125 mg/mL. For Sm:HAp-NPs withxSm=0.05a significant increase of antibacterial activity onE. coliwas observed in the range 0.5–1 mg/mL. For low concentrations of Sm:HAp-NPs (xSm=0.05) from 0.031 to 0.125 mg/mL a high antibacterial activity onEnterococcus faecalishas been noticed. A growth of the inhibitory effect onS. aureuswas observed for all concentrations of Sm:HAp-NPs withxSm=0.02.

Download Full-text

Adsorption properties of biologically active derivatives of quaternary ammonium surfactants and their mixtures at aqueous/air interface. I. Equilibrium surface tension, surfactant aggregation and wettability

Colloids and Surfaces B Biointerfaces ◽

10.1016/j.colsurfb.2013.05.009 ◽

2013 ◽

Vol 110 ◽

pp. 387-394 ◽

Cited By ~ 8

Author(s):

Monika Rojewska ◽

Andrzej Biadasz ◽

Michał Kotkowiak ◽

Anna Olejnik ◽

Joanna Rychlik ◽

...

Keyword(s):

Surface Tension ◽

Quaternary Ammonium ◽

Adsorption Properties ◽

Biologically Active ◽

Equilibrium Surface ◽

Equilibrium Surface Tension ◽

Air Interface ◽

Quaternary Ammonium Surfactants ◽

Derivatives Of ◽

Biologically Active Derivatives

Download Full-text

Fortunella japonica extract as a reducing agent for green synthesis of silver nanoparticles

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.10733 ◽

2018 ◽

Vol 7 (3) ◽

pp. 1570

Author(s):

Nguyen Phung Anh ◽

Truong Thi Ai Mi ◽

Duong Huynh Thanh Linh ◽

Nguyen Thi Thuy Van ◽

Hoang Tien Cuong ◽

...

Keyword(s):

Electron Microscopy ◽

Silver Nanoparticles ◽

Antibacterial Activity ◽

Volume Ratio ◽

Diffusion Method ◽

High Antibacterial Activity ◽

Agno3 Solution ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Average Size

A rapid way of synthesizing silver nanoparticles (AgNPs) by treating Ag+ ions with a green Fortunella Japonica (F.J.) extract as a combined reducing and stabilizing agent was investigated. The reaction solutions were monitored using UV-Vis spectroscopy, the size and shape of crystals were determined by scanning electron microscopy and transmission electron microscopy, the crystalline phases of AgNPs were presented by X–ray diffraction, and the relation of nanoparticles with Fortunella Japonica extract was confirmed using fourier transform infrared spectroscopy. The results indicated that no formation of AgNPs had taken place in the dark during 24 hours at room temperature and 40 oC. Meanwhile, it was found that the rate of AgNPs formation increased rapidly under the sunlight. The effects of the synthesis factors on the AgNPs formation were investigated. The suitable conditions for the synthesis of AgNPs using F.J. extract were determined as follows: F.J. extract was mixed with AgNO3 1.75 mM solution with the volume ratio of 3.5 AgNO3 solution/1.5 F.J. Extract, stirred 300 rpm for 150 minutes at 40 oC under sunlight illumination. At these conditions, AgNPs showed high crystalline structure with the average size of 15.9 nm. The antibacterial activity of silver nanoparticles was determined by agar well diffusion method against E. coli and B. subtilis bacteria. The green synthesized AgNPs performed high antibacterial activity against both bacteria.

Download Full-text