scholarly journals Cotton Cellulose-CdTe Quantum Dots Composite Films with Inhibition of Biofilm-Forming S. aureus

Fibers ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 57 ◽  
Author(s):  
Rohan S. Dassanayake ◽  
Poorna T. Wansapura ◽  
Phat Tran ◽  
Abdul Hamood ◽  
Noureddine Abidi
Keyword(s):  
Quantum Dots ◽  
Composite Film ◽  
Biofilm Formation ◽  
Biomedical Applications ◽  
Composite Films ◽  
X Ray Diffraction ◽  
Promising Candidate ◽  
X Ray ◽  
Cdte Qds

A cellulose-cadmium (Cd)-tellurium (TE) quantum dots (QDs) composite film was successfully synthesized by incorporating CdTe QDs onto a cellulose matrix derived from waste cotton linters. Cellulose-CdTe QDs composite film was characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The antibacterial activity of the prepared composite film was investigated using the multidrug-resistance (MTR) Staphylococcus aureus bacteria. In vitro antibacterial assays demonstrated that CdTe QDs composite film can efficiently inhibit biofilm formation. Our results showed that the cellulose-CdTe QDs composite film is a promising candidate for biomedical applications including wound dressing, medical instruments, burn treatments, implants, and other biotechnology fields.

Bimetallic DppfM(II) (M = Pt and Pd) dithiocarbamate complexes: Synthesis, characterization, and anticancer activity

2019 ◽  
Vol 43 (9-10) ◽  
pp. 437-442 ◽  
Author(s):  
Shou De Xu ◽  
Xiang Hua Wu
Keyword(s):  
Antitumor Activity ◽  
Platinum Complex ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
Antitumor Activities ◽  
High Potency ◽  
Promising Candidate ◽  
X Ray ◽  
Mtt Assays

A series of bimetallic dppfM(II) (dppf = 1,1’-bis (diphenyphosphino) ferrocene; M = Pt and Pd) dithiocarbamate complexes is synthesized and characterized by spectroscopic methods and single-crystal X-ray diffraction. Their antitumor activities in vitro are investigated by MTT assays against four cancer cell lines. The anticancer studies indicate most of the complexes display good to excellent antitumor activity. Remarkably, the platinum complex with a pyrrolidinyl substituent (3b) was identified as the most promising candidate due to its high potency and broad spectrum of activity.

Interfacial Characterization of Mosi2+ X Sic Composite Thin Films on Molybdenum Substrates

1996 ◽  
Vol 458 ◽  
Author(s):  
S. Govindarajan ◽  
J. J. Moore ◽  
T. R. Ohno ◽  
J. Disam
Keyword(s):  
Composite Film ◽  
Composite Films ◽  
Carbon Diffusion ◽  
Detailed Examination ◽  
X Ray Diffraction ◽  
Diffusion Anneal ◽  
Temperature Oxidation ◽  
X Ray ◽  
Diffusion Barrier Layer

ABSTRACTA novel coating architecture is being examined for enhancing the high temperature, oxidation resistance of molybdenum. The coating incorporates a thin, composite film of MoSi2+1.96 mole fraction SiC in order to match the coefficients of thermal expansion between the molybdenum substrate and the coating. Since the as-deposited composite film is amorphous in nature, a diffusion anneal treatment is carried out at 1000°C to achieve crystallization of the film. In this paper, a detailed examination of the Mo-MoSi2+1.96 SiC interface will be presented. The microstructural features of the composite films will be discussed based on electron microscopy, auger electron spectroscopy (AES), and X-ray diffraction analysis. Finally, a novel diffusion barrier layer for minimizing silicon and carbon diffusion from the coating to the substrate will be discussed.

scholarly journals Preparation of N-Doped TiO2-ZrO2Composite Films under Electric Field and Heat Treatment and Assessment of Their Removal of Methylene Blue from Solution

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Lefu Mei ◽  
Ranfang Zuo ◽  
Jing Xie ◽  
Libing Liao ◽  
Hao Ding
Keyword(s):  
Methylene Blue ◽  
Electric Field ◽  
Visible Light ◽  
Composite Film ◽  
Photoelectron Spectroscopy ◽  
Composite Films ◽  
Partial Replacement ◽  
Cutoff Wavelength ◽  
X Ray Diffraction ◽  
X Ray

TiO2-ZrO2composite film with the grain size of 50 nm was synthesized by electric field and heat (EF&H) treatments. Portions of O atoms in the TiO2network structure were replaced by N atoms as revealed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses, suggesting formation of a nonstoichiometric compoundTiO2-xNxon the composite film. The UV-Vis spectra of the film suggested that the visible light with wavelength of 550 nm could be absorbed for the N-doped composite film after EF&H treatment in comparison to a cutoff wavelength of 400 nm for the composite film without EF treatment. Photocatalytic experiments showed that the degradation rate of methylene blue by N-doped composite films increased significantly under visible light irradiation. The partial replacement of O by doped N played a very important role in narrowing the band gap and improving the visible light photocatalytic reactivity.

scholarly journals Biosynthesis of spinel nickel ferrite nanowhiskers and their biomedical applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hajar Q. Alijani ◽  
Siavash Iravani ◽  
Shahram Pourseyedi ◽  
Masoud Torkzadeh-Mahani ◽  
Mahmood Barani ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nickel Ferrite ◽  
Biomedical Applications ◽  
Leishmania Major ◽  
X Ray Diffraction ◽  
Green Method ◽  
X Ray ◽  
Transmission Electron ◽  
Low Toxicity

AbstractGreener methods for the synthesis of various nanostructures with well-organized characteristics and biomedical applicability have demonstrated several advantages, including simplicity, low toxicity, cost-effectiveness, and eco-friendliness. Spinel nickel ferrite (NiFe2O4) nanowhiskers with rod-like structures were synthesized using a simple and green method; these nanostructures were evaluated by X-ray diffraction analysis, transmission electron microscopy, scanning electron microscopy, and X-ray energy diffraction spectroscopy. Additionally, the prepared nanowhiskers could significantly reduce the survival of Leishmania major promastigotes, at a concentration of 500 μg/mL; the survival of promastigotes was reduced to ≃ 26%. According to the results obtained from MTT test (in vitro), it can be proposed that further studies should be conducted to evaluate anti-leishmaniasis activity of these types of nanowhiskers in animal models.

scholarly journals Synthesis of a Small Library of Nature-Inspired Xanthones and Study of Their Antimicrobial Activity

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2405 ◽  
Author(s):  
Diana I. S. P. Resende ◽  
Patrícia Pereira-Terra ◽  
Joana Moreira ◽  
Joana Freitas-Silva ◽  
Agostinho Lemos ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Biofilm Formation ◽  
Multidrug Resistant ◽  
Inhibitory Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xanthone Derivatives ◽  
Potent Inhibitory Effect ◽  
Resistant Strains

A series of thirteen xanthones 3–15 was prepared based on substitutional (appendage) diversity reactions. The series was structurally characterized based on their spectral data and HRMS, and the structures of xanthone derivatives 1, 7, and 8 were determined by single-crystal X-ray diffraction. This series, along with an in-house series of aminated xanthones 16–33, was tested for in-vitro antimicrobial activity against seven bacterial (including two multidrug-resistant) strains and five fungal strains. 1-(Dibromomethyl)-3,4-dimethoxy-9H-xanthen-9-one (7) and 1-(dibromomethyl)-3,4,6-trimethoxy-9H-xanthen-9-one (8) exhibited antibacterial activity against all tested strains. In addition, 3,4-dihydroxy-1-methyl-9H-xanthen-9-one (3) revealed a potent inhibitory effect on the growth of dermatophyte clinical strains (T. rubrum FF5, M. canis FF1 and E. floccosum FF9), with a MIC of 16 µg/mL for all the tested strains. Compounds 3 and 26 showed a potent inhibitory effect on two C. albicans virulence factors: germ tube and biofilm formation.

Electrophoretic Deposition of Organic - Inorganic Composites for Biomedical Applications

2012 ◽  
Vol 706-709 ◽  
pp. 617-622
Author(s):  
Rong Ma ◽  
Igor Zhitomirsky
Keyword(s):  
Electrophoretic Deposition ◽  
Biomedical Applications ◽  
Room Temperature ◽  
Deposition Time ◽  
Composite Films ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inorganic Composites ◽  
Deposition Yield

Electrophoretic deposition method has been developed for the fabrication of organic-inorganic composite films, containing bioglass and hydroxyapatite in a hyaluronic acid matrix. The film composition and deposition yield were varied by variation of the electrochemical bath composition and deposition time. The films were studied by scanning electron microscopy, thermogravimetric analysis and X-ray diffraction methods. The deposition method offers the advantages of room temperature processing and allows the fabrication of composite films for biomedical applications.

Influence of Strontium on In Vitro Bioactivity of Heat-Treated Porous Ca-P Ceramics on Titanium for Biomedical Applications

2011 ◽  
Vol 493-494 ◽  
pp. 453-457
Author(s):  
Kuan Chen Kung ◽  
Tzer Min Lee ◽  
Truan Sheng Lui
Keyword(s):  
Body Fluid ◽  
Biomedical Applications ◽  
Clinical Applications ◽  
Apatite Layer ◽  
X Ray Diffraction ◽  
Apatite Phase ◽  
X Ray ◽  
Heat Treated ◽  
Scanning Electron

The bioactivity of materials was evaluated based on the ability to induce a bond-like apatite layer on the surface in simulated body fluid (SBF). The aim of this study was to investigate the coatings containing strontium on bioactivity after heat treatment. After the materials were soaked in SBF for 1 day, precipitates did not form on the surface of heat-treated MAO coating without strontium. The precipitates were observed on surface of heat-treated MAO coatings containing strontium. After 7 days, the surface of heat-treated MAO coatings containing strontium was completely covered with precipitates. The precipitates were found to be composed of fiber structures using scanning electron microscope (SEM). The phase was identified as the apatite phase using thin film X-ray diffraction (TF-XRD). The results show that heat-treated MAO coatings containing strontium can induce the formation of an apatite layer on their surface. All finding in this study indicated that heat-treated MAO coatings containing strontium have good bioactivity for clinical applications.

Extraction and Characterization of Natural Hydroxyapatite from Goat Bone for Biomedical Applications

2020 ◽  
Vol 1010 ◽  
pp. 573-578
Author(s):  
Sarfa Azian Ismail ◽  
Hasan Zuhudi Abdullah
Keyword(s):  
Calcination Temperature ◽  
Biomedical Applications ◽  
Extraction Process ◽  
Apatite Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Shape Structure ◽  
Micron Size

Bioactive apatite, which is hydroxyapatite (HAP) with the chemical formula of Ca10(PO4)6(OH)2 have been extensively investigated for biomedical applications in bone and teeth implants due to its biocompatibility characteristics has similar physical-chemical characteristics with human bone. The issues to be highlighted here is to explore the potential of using food waste from goat bone to produce useful natural HAP. This study is to extract natural HAP powder from goat bone waste. The extraction process involved cleaning and boiling process, drying process, crushing, grinding and milling to obtain micron size powder of goat bone and joint. The sample then underwent a calcination process with 900°C, 1000°C, and 1100°C for goat bone and 900°C for goat joint with 3 hours holding time. The characteristic of produced HAP powder was characterised with Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The in vitro testing of HAP completed by using Simulated Body Fluid (SBF) and SEM to observe the microstructure of apatite formation. The XRD and EDS results show the HAP crystallinity and Ca/P ratio increase with the increasing of calcination temperature for bone. The bone-like apatite formation appeared in the goat bone and joint sample with calcination temperature 900°C, 1000°C, and 1100°C. The optimum hydroxyapatite is from goat bone sample with calcination temperature 1100°C due to the apatite growth fully cover the surface of the sample with a needle shape structure of the cauliflower structure.

Electrically excited oscillation and crystalline structure of a nanoclay/poly(vinylidene fluoride) composite film

2011 ◽  
Vol 22 (18) ◽  
pp. 2103-2112 ◽  
Author(s):  
Go Murasawa ◽  
Akihiro Nishioka ◽  
Ken Miyata ◽  
Tomonori Koda ◽  
Hideo Cho
Keyword(s):  
Composite Film ◽  
Crystalline Structure ◽  
Vinylidene Fluoride ◽  
Composite Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Impedance Characteristics ◽  
Poly Vinylidene Fluoride ◽  
Excited Oscillation

This study was conducted to investigate electrically excited oscillation and crystalline structure of nanoclay/poly(vinylidene fluoride) (PVDF) composite films. First, nanoclay/PVDF composite films are fabricated by solvent casting. Second, their PVDF crystalline structure and nanoclay orientation are analyzed using x-ray diffraction. The impedance characteristics of films are then measured. Third, the oscillation excited from films as a result of applied voltage is measured. Thereby, we confirmed the presence of unoriented β-phase PVDF crystals and exfoliated-type nanoclay structure in a composite film. The output oscillation showed monotonic component corresponding to the input sinusoidal voltage at a high frequency range, although its amplitude is low.

Synthesis and Characterization of CdTe Quantum Dots Capped by N-Acetyl-L-Cysteine

2013 ◽  
Vol 275-277 ◽  
pp. 1956-1959
Author(s):  
Xiu Lin Liao ◽  
Na Yang ◽  
Lin Xiang Xie ◽  
Xiao Cui Yang ◽  
Xiu Pei Yang
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Emission Spectra ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cdte Qds ◽  
Transmission Electron ◽  
Cadmium Telluride Quantum Dots

The highly luminescent cadmium telluride quantum dots (CdTe QDs) have been synthesized by using N-acetyl-L-cysteine (NAC) as stabilizer in aqueous solution. Experiments indicate that the QDs nanocrystals could grow larger as the extension of reaction time, causing the red shift of emission spectra. The typical product was analyzed by fluorescence spectroscopy, high-resolution transmission electron microscope (HRTEM), x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The morphological and structural characterization confirmed the formation of monodisperse CdTe QDs with several nanometers in size.

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