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1. Adsorption of Cr(vi) onto a magnetic CoFe₂O₄/MgAl-LDH composite and mechanism study

Author:
Deng, Lin; Shi, Zhou; Peng, Xiaoxu
Source:
RSC advances 2015 v.5 no.61 pp. 49791-49801
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorbents; adsorption; aqueous solutions; chromium; coprecipitation; heat production; ion exchange; magnetic materials; magnetism; nitrogen; pollutants; scanning electron microscopy; sorption isotherms; temperature; wastewater treatment
Abstract:
... Magnetic materials as adsorbents can provide effective removal and quickly separate pollutants in wastewater treatment. A magnetic CoFe₂O₄/MgAl-LDH composite was successfully synthesized through a low saturation coprecipitation method. The adsorption behaviors of Cr(vi) from an aqueous solution by CoFe₂O₄/MgAl-LDH were investigated. The adsorbents were characterized using scanning electron microsc ...
DOI:
10.1039/c5ra06178d

2. A sensor for formaldehyde detection: luminescent metal–organic framework [Zn₂(H₂L)(2,2′-bpy)₂(H₂O)]ₙ

Author:
Zhao, Zhengyan; Hao, Juanyuan; Song, Xuedan; Ren, Suzhen; Hao, Ce
Source:
RSC advances 2015 v.5 no.61 pp. 49752-49758
ISSN:
2046-2069
Subject:
coordination polymers; density functional theory; encapsulation; fluorescence; formaldehyde; geometry; hydrogen bonding; nuclear magnetic resonance spectroscopy
Abstract:
... Density functional theory and time-dependent density functional theory methods have been used to investigate the hydrogen bonding between the Metal–organic framework [Zn₂(H₂L)(2,2′-bpy)₂(H₂O)]ₙ and formaldehyde in the electronically excited state. The calculated geometric configuration, ¹H NMR chemical shift and IR spectra of the hydrogen-bonded complex demonstrated that the hydrogen bond was stre ...
DOI:
10.1039/c5ra07373a

3. High performance NiO microsphere anode assembled from porous nanosheets for lithium-ion batteries

Author:
Chu, Lihua; Li, Meicheng; Li, Xiaodan; Wang, Yu; Wan, Zipei; Dou, Shangyi; Song, Dandan; Li, Yingfeng; Jiang, Bing
Source:
RSC advances 2015 v.5 no.61 pp. 49765-49770
ISSN:
2046-2069
Subject:
anodes; electrochemistry; electrolytes; lithium; lithium batteries; microparticles; nanosheets; nickel oxide
Abstract:
... 3D NiO microspheres assembled from porous nanosheets are prepared and evaluated as an anode material for lithium-ion batteries, showing excellent electrochemical performance with high lithium storage capacity, and satisfactory cyclability and rate performance. The NiO microspheres deliver a first discharge capacity of 1242 mA h g⁻¹ with a reversible capacity up to 820 mA h g⁻¹ after 100 cycles at ...
DOI:
10.1039/c5ra05659d

4. In vitro 30 nm silver nanoparticles promote chondrogenesis of human mesenchymal stem cells

Author:
He, Wei; Kienzle, Arne; Liu, Xujie; Müller, Werner E. G.; Feng, Qingling
Source:
RSC advances 2015 v.5 no.61 pp. 49809-49818
ISSN:
2046-2069
Subject:
acute exposure; antibiotics; antimicrobial properties; cartilage; chondrocytes; chondrogenesis; chronic exposure; collagen; cytoplasm; glycosaminoglycans; hypertrophy; immunohistochemistry; mesenchymal stromal cells; nanomedicine; nanosilver; quantitative polymerase chain reaction; staining; tissue engineering
Abstract:
... Silver nanoparticles (Ag NPs) are one of the most widely used products in nano-medicine due to their broad-spectrum antimicrobial activity. In tissue engineering, Ag NPs are often incorporated as antibacterial agents in scaffolds, which are subsequently loaded with human bone marrow-derived mesenchymal stem cells (hMSCs). In this study, we investigated the effect of Ag NPs on chondrogenesis of hMS ...
DOI:
10.1039/c5ra06386h

5. Morphological evolution of gold nanoparticles on silicon nanowires and their plasmonics

Author:
Li, Yuan; Shi, Wenwu; Gupta, Aditya; Chopra, Nitin
Source:
RSC advances 2015 v.5 no.61 pp. 49708-49718
ISSN:
2046-2069
Subject:
Raman spectroscopy; X-ray photoelectron spectroscopy; annealing; chemical composition; gold; heat treatment; nanogold; nanoparticles; nanowires; phase transition; silicon; vapors
Abstract:
... One-dimensional heterostructures composed of silicon (Si) nanowires and uniformly decorated with gold (Au) nanoparticles were fabricated and used as a substrate for organic detection based on the surface-enhanced Raman spectroscopy. Si nanowires were grown via a silane-based chemical vapor deposition approach. The controlled decoration of Au nanoparticles on the Si nanowires was achieved using wet ...
DOI:
10.1039/c5ra06921a

6. Understanding room-temperature metastability of graphene oxide utilizing hydramines from a synthetic chemistry view

Author:
Qian, Yueyue; Zhang, Shupeng; Gao, Juanjuan; Song, Haiou
Source:
RSC advances 2015 v.5 no.61 pp. 49688-49695
ISSN:
2046-2069
Subject:
active sites; ambient temperature; graphene; graphene oxide; moieties; nanocomposites; nanomaterials; organic matter
Abstract:
... Owing to polydispersity and polyfunctionality, the chemically controlled heterogeneous synthesis of graphene-based compounds is a great challenge for synthetic chemists. Graphene oxide as significant precursor is playing an irreplaceable part in multiple applications. The external temperature stimuli-response process based on the chemistry of graphene oxide is not well understood. An improved fund ...
DOI:
10.1039/c5ra05742f

7. A eutectic mixture of choline chloride and urea as an assisting solvent in the synthesis of flower-like hierarchical BiOCl structures with enhanced photocatalytic activity

Author:
Ge, Jianhua; Guo, Xuetao; Xu, Xin; Zhang, Pingping; Zhu, Jingling; Wang, Jingbo
Source:
RSC advances 2015 v.5 no.61 pp. 49598-49605
ISSN:
2046-2069
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; aqueous solutions; catalysts; chlorine; choline chloride; lighting; nitrogen; oxidation; photocatalysis; reflectance spectroscopy; scanning electron microscopy; solar radiation; solvents; urea
Abstract:
... Flower-like hierarchical BiOCl structures were successfully synthesized in the presence of a eutectic mixture of choline chloride and urea through a solvothermal process. The as-prepared sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption–desorption analysis, photo-electrochemical analysis and UV-vis diffuse ...
DOI:
10.1039/c5ra07090b

8. An electrochemical study based on thymine–Hg–thymine DNA base pair mediated charge transfer processes

Author:
Xu, Ensheng; Lv, Yanqin; Liu, Jifeng; Gu, Xiaohong; Zhang, Shuqiu
Source:
RSC advances 2015 v.5 no.61 pp. 49819-49823
ISSN:
2046-2069
Subject:
DNA; atomic force microscopy; deformation; electrochemistry; gold; ions; mercury; methylene blue; nucleobases
Abstract:
... A DNA monolayer composed of a double strand of 25 base pairs was adsorbed onto a Au surface. Matched base pairs were present at the gold surface and distal part, while (TT)ₙ mismatched pairs were present at the middle of DNA monolayer. Methylene blue was attached to the end DNA monolayer via a C₆ alkyene linker and acted as the electrochemical probe. Upon the addition of mercury ions (Hg(ii)), thy ...
DOI:
10.1039/c5ra06238a

9. Assembly of Zn-metal organic frameworks based on a N-rich ligand: selective sorption for CO₂ and luminescence sensing of nitro explosives

Author:
Hu, Xiao-Li; Qin, Chao; Zhao, Liang; Liu, Fu-Hong; Shao, Kui-Zhan; Su, Zhong-Min
Source:
RSC advances 2015 v.5 no.61 pp. 49606-49613
ISSN:
2046-2069
Subject:
acetone; adsorption; aromatic compounds; carbon dioxide; coordination polymers; emissions factor; explosives; fumaric acid; ions; ligands; luminescence; methanol; nitrobenzenes; nitrogen; solvents; topology; zinc
Abstract:
... Two novel Zn(II) coordination polymer compounds, namely, [Zn₃(HL)₂(fma)₂]·DMA·H₂O (1) and [Zn₂(μ₃-OH)(HL)(Br-bdc)]·0.5DMA·CH₃OH·H₂O (2) have been successfully obtained with 1-(5-tetrazolyl)-4-(1-imidazolyl) benzene ligand and dicarboxylic acids (fma = fumaric acid; Br-bdc = 2-bromoterephthalic acid). Compound 1 exhibits a 3D framework with a square aperture diameter for the channel is 8.8 × 8.8 Ų ...
DOI:
10.1039/c5ra05945c

10. A ZnO decorated chitosan–graphene oxide nanocomposite shows significantly enhanced antimicrobial activity with ROS generation

Author:
Ray Chowdhuri, Angshuman; Tripathy, Satyajit; Chandra, Soumen; Roy, Somenath; Sahu, Sumanta Kumar
Source:
RSC advances 2015 v.5 no.61 pp. 49420-49428
ISSN:
2046-2069
Subject:
Escherichia coli; Fourier transform infrared spectroscopy; Gram-negative bacteria; Gram-positive bacteria; Staphylococcus aureus; X-ray diffraction; antibacterial properties; antibiotic resistance; antibiotics; catalase; chitosan; crystal structure; environmental engineering; enzyme activity; graphene; graphene oxide; health services; minimum inhibitory concentration; moieties; nanocomposites; nanoparticles; nitric oxide; reactive oxygen species; scanning electron microscopy; zinc oxide
Abstract:
... The rise in antimicrobial resistance requires the development of new antibacterial agents. Herein, we develop nanocomposites by growing zinc oxide nanoparticles on the surface of chitosan (CS) modified graphene oxide (GO), obtaining GO@CS/ZnO as a novel antibacterial material. The crystal structures, surface functional groups and morphology were analyzed by using X-ray diffraction (XRD) pattern, F ...
DOI:
10.1039/c5ra05393e

11. Controlled synthesis of functional Ag, Ag–Au/Au–Ag nanoparticles and their Prussian blue nanocomposites for bioanalytical applications

Author:
Pandey, Prem. C.; Singh, Richa; Pandey, Yashashwa
Source:
RSC advances 2015 v.5 no.61 pp. 49671-49679
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; catalytic activity; cations; cyclohexanones; dispersibility; formaldehyde; gold; metal ions; nanocomposites; nanogold; nanoparticles; nanosilver; peroxidase; reducing agents; silver; transmission electron microscopy; ultraviolet-visible spectroscopy
Abstract:
... In this work, we report a facile approach to synthesize processable silver nanoparticles (AgNPs), bimetallic nanoparticles (Ag–Au/Au–Ag) and a decorated Prussian blue nanocomposite (PB–AgNP). The presence of cyclohexanone/formaldehyde facilitates the formation of functional AgNPs and Ag–Au/Au–Ag from 3-aminopropyltrimethoxysilane (3-APTMS) and the respective capped noble metal ions. The use of the ...
DOI:
10.1039/c5ra06251a

12. Co₃O₄ nanoparticles/cellulose nanowhiskers-derived amorphous carbon nanoneedles: sustainable materials for supercapacitors and oxygen reduction electrocatalysis

Author:
Silva, R.; Pereira, G. M.; Voiry, D.; Chhowalla, M.; Asefa, T.
Source:
RSC advances 2015 v.5 no.61 pp. 49385-49391
ISSN:
2046-2069
Subject:
capacitance; carbon; catalytic activity; cellulose; cobalt; cobalt oxide; composite materials; electrochemistry; metal ions; nanocrystals; nanoparticles; oxygen; pyrolysis; silica
Abstract:
... Hybrid nanostructured materials comprised of amorphous carbon nanoneedles (CNN)-supported Co₃O₄ nanoparticles (Co₃O₄-CNN) were synthesized. The synthesis involved layer-by-layer nanocasting of cellulose nanowhiskers with precursors of cobalt oxide and silica, followed by pyrolysis of the core–shell–shell composite materials and etching of the outer silica shells from the carbonized materials. Nota ...
DOI:
10.1039/c5ra08037a

13. Cyclosporine A loaded self-nanoemulsifying drug delivery system (SNEDDS): implication of a functional excipient based co-encapsulation strategy on oral bioavailability and nephrotoxicity

Author:
Jain, Sanyog; Kambam, Sindhu; Thanki, Kaushik; Jain, Amit K.
Source:
RSC advances 2015 v.5 no.61 pp. 49633-49642
ISSN:
2046-2069
Subject:
bioactive compounds; bioavailability; biomarkers; blood serum; cell lines; creatinine; cyclosporine; drug delivery systems; emulsifying; gastric juice; hulls; nephrotoxicity; oils; pharmacokinetics; reactive oxygen species; solubility; stabilizers; surfactants; urea nitrogen; value added; vitamin E
Abstract:
... The present work focusses on the formulation development and evaluation of a functional excipient (surfactant stabilizer), a vitamin E TPGS loaded self-nanoemulsifying drug delivery system (SNEDDS), for improving the deliverability and safety profile of cyclosporine A (CyA). The saturation solubility of individual bioactive compounds were evaluated in a series of oils and surfactants. In addition, ...
DOI:
10.1039/c5ra04762e

14. Dielectric elastomers, with very high dielectric permittivity, based on silicone and ionic interpenetrating networks

Author:
Yu, Liyun; Madsen, Frederikke Bahrt; Hvilsted, Søren; Skov, Anne Ladegaard
Source:
RSC advances 2015 v.5 no.61 pp. 49739-49747
ISSN:
2046-2069
Subject:
actuators; dielectric permittivity; electric potential difference; modulus of elasticity; silicone; viscoelasticity
Abstract:
... Dielectric elastomers (DEs), which represent an emerging actuator and generator technology, admittedly have many favourable properties, but their high driving voltages are one of the main obstacles to commercialisation. One way to reduce driving voltage is by increasing the ratio between dielectric permittivity and the Young's modulus of the elastomer. One system that potentially achieves this inv ...
DOI:
10.1039/c5ra07375h

15. Diindenothienoacene–tetrathiafulvalene redox systems

Author:
Christensen, Mikkel A.; Rudebusch, Gabriel E.; Parker, Christian R.; Andersen, Cecilie Lindholm; Kadziola, Anders; Haley, Michael M.; Hammerich, Ole; Nielsen, Mogens Brøndsted
Source:
RSC advances 2015 v.5 no.61 pp. 49748-49751
ISSN:
2046-2069
Subject:
cations; crystals; thiophene
Abstract:
... Extended tetrathiafulvalenes with central diindenothienoacene cores were prepared and studied for their redox and spectroelectrochemical properties, which depended strongly on the orientation of the thiophene rings. The cations undergo remarkably strong associations, rendering them attractive as redox-controllable tectons in supramolecular chemistry, and in one case crystals were grown by electroc ...
DOI:
10.1039/c5ra09581f

16. Di(p-methoxyphenyl)amine end-capped tri(p-thiophenylphenyl)amine based molecular glasses as hole transporting materials for solid-state dye-sensitized solar cells

Author:
Bui, Thanh-Tuân; Shah, Said Karim; Sallenave, Xavier; Abbas, Mamatimin; Sini, Gjergji; Hirsch, Lionel; Goubard, Fabrice
Source:
RSC advances 2015 v.5 no.61 pp. 49590-49597
ISSN:
2046-2069
Subject:
air; dyes; energy conversion; glass; lighting; solar cells
Abstract:
... Three tris(thienylphenyl)amine-based molecular glass hole transporting materials were synthetized, characterized and incorporated in solid state dye-sensitized solar cells. Devices using these compounds as solid hole conductors show relatively high Vₒc thanks to good energy level matching between them and the associated D102 indoline dye. However, they yield relatively low Jₛc and FF compared to S ...
DOI:
10.1039/c5ra07226c

17. Discovery of NAD(P)H:quinone oxidoreductase 1 (NQO1) inhibitors with novel chemical scaffolds by shape-based virtual screening combined with cascade docking

Author:
Bian, Jinlei; Qian, Xue; Deng, Bang; Xu, Xiaoli; Guo, Xiaoke; Wang, Yalou; Li, Xiang; Sun, Haopeng; You, Qidong; Zhang, Xiaojin
Source:
RSC advances 2015 v.5 no.61 pp. 49471-49479
ISSN:
2046-2069
Subject:
NAD (coenzyme); NAD(P)H dehydrogenase (quinone); databases; dicoumarol; in vitro studies; quinones; screening; toxicity
Abstract:
... A number of novel NAD(P)H:quinone oxidoreductase 1 (NQO1) inhibitors were discovered from the ChemDiv database via a simple protocol. Based on two reference NQO1 inhibitors, dicoumarol (DIC) and ES936, a shape-based similarity search and cascade docking filtering were conducted to identify new NQO1 inhibitors. Using these techniques, 43 compounds were selected, ordered, and tested. Among them, 7 c ...
DOI:
10.1039/c5ra05919d

18. Doped graphene: synthesis, properties and bioanalysis

Author:
Zhang, Wenyan; Wu, Longfei; Li, Zhaolong; Liu, Yang
Source:
RSC advances 2015 v.5 no.61 pp. 49521-49533
ISSN:
2046-2069
Subject:
catalytic activity; graphene
Abstract:
... Graphene has attracted an enormous amount of interest because of its excellent properties. The relatively versatile possibilities in the doping of graphene sheets afford them with tuneable electronic properties, and provide a simple but efficient approach in tuning their catalytic activity at an atomic level. Recently, a lot of efforts have been carried out to further tailor the electronic and cat ...
DOI:
10.1039/c5ra05051k

19. Efficient access to polysubstituted tetrahydrofurans by electrophilic cyclization of vinylsilyl alcohols

Author:
Barbero, Asunción; Barbero, Héctor; González-Ortega, Alfonso; Pulido, Francisco J.; Val, Patricia; Diez-Varga, Alberto; Morán, Joaquín R.
Source:
RSC advances 2015 v.5 no.61 pp. 49541-49551
ISSN:
2046-2069
Subject:
Lewis acids; alcohols; cyclization reactions; stereoselectivity; tetrahydrofuran
Abstract:
... Vinylsilyl alcohols undergo intramolecular cyclization to provide di-, tri- or tetrasubstituted-tetrahydrofurans. The influence of the number and position of substituents in the stereoselectivity of the process has been studied. Moreover, DFT calculations have been performed to get better insight into the influence of the substitution pattern of the vinylsilyl alcohol in the stereoselectivity of t ...
DOI:
10.1039/c5ra06640a

20. Electrochemical characterization of Pt–Ru–Ni/C anode electrocatalyst for methanol electrooxidation in membraneless fuel cells

Author:
Arun, A.; Gowdhamamoorthi, M.; Ponmani, K.; Kiruthika, S.; Muthukumaran, B.
Source:
RSC advances 2015 v.5 no.61 pp. 49643-49650
ISSN:
2046-2069
Subject:
X-ray diffraction; ambient temperature; anodes; catalysts; catalytic activity; chemical reduction; crystal structure; electrochemistry; electrolytes; energy-dispersive X-ray analysis; fuel cells; fuels; methanol; nickel; oxidants; oxidation; particle size; platinum; ruthenium; sodium borohydride; sulfuric acid; transmission electron microscopy
Abstract:
... In the present work, carbon-supported Pt–Ru, Pt–Ni and Pt–Ru–Ni electrocatalysts with different atomic ratios were synthesized by NaBH₄ reduction method. The synthesized electrocatalysts were characterized by TEM, EDX and XRD analyses. The Pt metal was the predominant material in all the samples, with peaks attributed to the face-centered cubic (fcc) crystalline structure. The TEM analysis indicat ...
DOI:
10.1039/c5ra04958j