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1. Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation

Author:
Yong, Ee Ling; Lin, Yi-Pin
Source:
RSC advances 2016 v.6 no.22 pp. 18587-18595
ISSN:
2046-2069
Subject:
activation energy; ambient temperature; fulvic acids; hydroxyl radicals; models; moieties; ozonation; ozone; pH; pollutants; pollution control; rivers
Abstract:
... The effects of pH value and temperature on the initiation (kI), promotion (kP), inhibition (kS) and direct ozone reaction (kD) rate constants of natural organic matter (NOM) in water ozonation were investigated in this study. These rate constants were determined using a newly developed method that integrates the classical Rcₜ concept, the transient steady-state hydroxyl radical (˙OH) concentration ...
DOI:
10.1039/c5ra19359a

2. Hybridization of graphene sheets with polyethylene terephthalate through the process of in situ polymerization aided by ultrasound

Author:
González Morones, Pablo; Fernández Tavizón, Salvador; Hernández Hernández, Ernesto; Alberto Gallardo Vega, Carlos; De León Santillán, Arxel
Source:
RSC advances 2016 v.6 no.22 pp. 18413-18418
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray diffraction; graphene; moieties; nanocomposites; oxygen; polyethylene terephthalates; polymerization; thermogravimetry; transmission electron microscopy; ultrasonic treatment
Abstract:
... A new methodology to prepare hybrid graphene–polyethylenterephthalate nanocomposites by ultrasonication is reported. The hybrids were synthesized by in situ polymerization of a mixture of bis(2-hydroxyethyl) terephthalate (BHET) monomer and graphite oxide (GO) at 200 °C, in bulk. The hybrids were analyzed by Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), Raman sp ...
DOI:
10.1039/c5ra24325d

3. Removal of Rhodamine B from water by using CdTeSe quantum dot-cellulose membrane composites

Author:
Baslak, Canan; Arslan, Gulsin; Kus, Mahmut; Cengeloglu, Yunus
Source:
RSC advances 2016 v.6 no.22 pp. 18549-18557
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; absorbance; atomic force microscopy; confocal microscopy; contact angle; fluorescence emission spectroscopy; hydrochloric acid; pH; polymers; quantum dots; rhodamines
Abstract:
... Facilitated transport of Rhodamine B through a novel polymer inclusion membrane (PIM) containing CdTeSe Quantum Dots (QDs) as a carrier reagent has been investigated. The prepared PIM was characterized with Fourier transform infrared (FT-IR) spectroscopy, Atomic Force Microscopy (AFM), confocal microscopy, X-ray Photoelectron Spectroscopy (XPS) and fluorescence spectroscopy (PL) techniques and con ...
DOI:
10.1039/c5ra23433f

4. Silver nanoparticles with different size and shape: equal cytotoxicity, but different antibacterial effects

Author:
Helmlinger, J.; Sengstock, C.; Groß-Heitfeld, C.; Mayer, C.; Schildhauer, T. A.; Köller, M.; Epple, M.
Source:
RSC advances 2016 v.6 no.22 pp. 18490-18501
ISSN:
2046-2069
Subject:
antibacterial properties; atomic force microscopy; bacteria; blood platelets; cell culture; culture media; cytotoxicity; ions; light scattering; mesenchymal stromal cells; nanosilver; oxygen; pH; prokaryotic cells; pyrrolidones; scanning electron microscopy; silver; surface area; ultracentrifugation
Abstract:
... The influence of silver nanoparticle morphology on the dissolution kinetics in ultrapure water as well as the biological effect on eukaryotic and prokaryotic cells was examined. Silver nanoparticles with different shapes but comparable size and identical surface functionalisation were prepared, i.e. spheres (diameter 40–80 and 120–180 nm; two different samples), platelets (20–60 nm), cubes (140–18 ...
DOI:
10.1039/c5ra27836h

5. A hybrid organic–inorganic layered TiO₂ based nanocomposite for sunlight photocatalysis

Author:
Benavente, Eglantina; Maldonado, Carlos; Devis, Sindy; Diaz, Leslie; Lozano, Harold; Sotomayor-Torres, Clivia; González, Guillermo
Source:
RSC advances 2016 v.6 no.22 pp. 18538-18541
ISSN:
2046-2069
Subject:
cadmium; methylene blue; nanocomposites; nanosheets; photocatalysis; photolysis; solar radiation; stearic acid; titanium dioxide
Abstract:
... A novel hybrid nanocomposite constituted of single TiO₂ nanosheets sandwiched between stearic acid self-assembled monolayers was synthesized and tested in the photodegradation of methylene blue under sunlight. The product showed better photocatalytic performance than anatase under similar conditions, which may be further improved through sensitization with cadmium sulfide. ...
DOI:
10.1039/c5ra26981d

6. A liquid-crystalline perylene tetracarboxylic bisimide derivative bearing trisiloxan-2-yl moieties: influence on mesomorphic properties and electron transport

Author:
Funahashi, Masahiro; Takeuchi, Nozomi; Sonoda, Akinari
Source:
RSC advances 2016 v.6 no.22 pp. 18703-18710
ISSN:
2046-2069
Subject:
ambient temperature; electron transfer; moieties
Abstract:
... Mesomorphic and electron transport properties are compared for liquid-crystalline (LC) perylene tetracarboxylic bisimide (PTCBI) derivatives bearing linear disiloxane and trisiloxane chains, as well as bis(trimethylsiloxanyl)methylsilyl(trisiloxan-2-yl) groups. In contrast to alkyl-substituted analogues, the PTCBI derivative bearing bulky trisiloxan-2-yl moieties exhibits a more ordered columnar p ...
DOI:
10.1039/c5ra23119a

7. An amperometric glucose biosensor based on a MnO₂/graphene composite modified electrode

Author:
Liu, Yuge; Zhang, Xiumei; He, Dongning; Ma, Feiyue; Fu, Qiong; Hu, Yun
Source:
RSC advances 2016 v.6 no.22 pp. 18654-18661
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; biosensors; electrochemistry; electron transfer; glassy carbon electrode; glucose; glucose oxidase; hot water treatment; manganese dioxide; nanorods; oxidation; scanning electron microscopy
Abstract:
... In this paper, a novel composite of graphene/MnO₂ (GR/MnO₂) was successfully synthesized by a simple one-step hydrothermal method. The as-synthesized MnO₂ and the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The results showed that MnO₂ was nanorods and the two ...
DOI:
10.1039/c6ra02680j

8. A new avenue to the synthesis of highly substituted pyrroles: synthesis from N-propargylamines

Author:
Vessally, Esmail
Source:
RSC advances 2016 v.6 no.22 pp. 18619-18631
ISSN:
2046-2069
Subject:
bioactive properties; pyrroles
Abstract:
... Pyrroles have attracted much attention due to their potential biological activities. Developing more efficient methods for the generation of pyrrole cores with unusual substitution patterns e.g. 2,4-disubstituted pyrroles is particularly interesting. This review gives an overview of new developments in the synthesis of highly substituted pyrroles from N-propargylamines in recent years. ...
DOI:
10.1039/c5ra20706a

9. A novel carbazole-based mitochondria-targeted ratiometric fluorescent probe for bisulfite in living cells

Author:
Wang, Gang; Chen, Hao; Chen, Xiuli; Xie, Yongmei
Source:
RSC advances 2016 v.6 no.22 pp. 18662-18666
ISSN:
2046-2069
Subject:
bisulfites; fluorescent dyes; mitochondria
Abstract:
... A novel mitochondria-targeted ratiometric fluorescent probe was developed via condensation of carbazole with two indolium units, which could realize the detection of bisulfite in a PBS buffer solution. The probe exhibited good mitochondrial location ability and could selectively respond to bisulfite among other sulfur-containing species in living cells. ...
DOI:
10.1039/c5ra27805h

10. Bandgap engineering of MoS₂/MX₂ (MX₂ = WS₂, MoSe₂ and WSe₂) heterobilayers subjected to biaxial strain and normal compressive strain

Author:
Su, Xiangying; Ju, Weiwei; Zhang, Ruizhi; Guo, Chongfeng; Zheng, Jiming; Yong, Yongliang; Li, Xiaohong
Source:
RSC advances 2016 v.6 no.22 pp. 18319-18325
ISSN:
2046-2069
Subject:
compression strength; semiconductors; sulfides
Abstract:
... Using first-principles calculations, we studied the electronic properties of quasi-2D MoS₂/MX₂ (MX₂ = WS₂, MoSe₂ and WSe₂) heterobilayers, focusing on engineering the band gap via application of in-plane biaxial strain and out-of-plane normal compressive strain (NCS). All heterobilayers show semiconducting characteristics with an indirect band gap except for the MoS₂/WSe₂ system which exhibits dir ...
DOI:
10.1039/c5ra27871f

11. Copper-catalysed synthesis of trifluoromethyl(hetero)arenes from di(hetero)aryl-λ³-iodanes

Author:
Pandey, Vinay Kumar; Anbarasan, Pazhamalai
Source:
RSC advances 2016 v.6 no.22 pp. 18525-18529
ISSN:
2046-2069
Subject:
aromatic hydrocarbons; moieties; regioselectivity
Abstract:
... An efficient synthesis of trifluoromethylated (hetero)arenes has been achieved through the regioselective copper-catalyzed trifluoromethylation of di(hetero)aryl-λ³-iodanes, employing readily available trifluoromethyltrimethylsilane. The reaction works well for both symmetrical and unsymmetrical di(hetero)aryl-λ³-iodanes with good regioselectivity and also tolerates diverse functional groups such ...
DOI:
10.1039/c5ra27128b

12. CTAB@BiOCl: a highly adsorptive photocatalyst for eliminating dye contamination

Author:
Yu, Yichang; Hu, Zhangjun; Zhang, Yalei; Gao, Hongwen
Source:
RSC advances 2016 v.6 no.22 pp. 18577-18582
ISSN:
2046-2069
Subject:
adsorption; cetyltrimethylammonium bromide; coprecipitation; hydrolysis; photocatalysis; photocatalysts; recycling; surface area
Abstract:
... The title composite was synthesized under facile conditions by hydrolysis and co-precipitation. Through comparative studies, it was found that the morphology, structure and properties were affected by hexadecyl trimethylammonium bromide (CTAB) doping. Although the surface area decreases from 53.5 to 7.5 m² g⁻¹, it was found that CTAB@BiOCl exhibits higher adsorption capacity than the isolated BiOC ...
DOI:
10.1039/c5ra27714k

13. Design, synthesis and in vitro evaluation of anticancer and antibacterial potential of surface modified Tb(OH)₃@SiO₂ core–shell nanoparticles

Author:
Khan, Shahanavaj; Ansari, Anees A.; Khan, Abdul Arif; Al-Kattan, Wael; Al-Obeed, Omar; Ahmad, Rehan
Source:
RSC advances 2016 v.6 no.22 pp. 18667-18677
ISSN:
2046-2069
Subject:
Gram-positive bacteria; Western blotting; antibacterial properties; apoptosis; biocompatibility; colorectal neoplasms; cytotoxicity; erythrocytes; genes; hemolysis; in vitro studies; inhibitory concentration 50; irradiation; nanoparticles; neoplasm cells; silica; solubility; terbium; therapeutics; transmission electron microscopy; ultraviolet radiation; viability
Abstract:
... In the current study, we modified the surface of Tb(OH)₃ nanoparticles with a silica layer to enhance their solubility and biocompatibility. Transmission electron microscopy confirmed the improvements in these properties. Tb(OH)₃@SiO₂ core–shell nanoparticles (TS-CSNPs) exhibited a strong green emission peak upon irradiation with ultraviolet light, which originates from the electric-dipole transit ...
DOI:
10.1039/c5ra17906h

14. DFT studies on the mechanism of palladium catalyzed arylthiolation of unactive arene to diaryl sulfide

Author:
Zhou, Ya-ping; Wang, Mei-yan; Fang, Sheng; Chen, Yu; Liu, Jing-yao
Source:
RSC advances 2016 v.6 no.22 pp. 18300-18307
ISSN:
2046-2069
Subject:
benzene; carbon-hydrogen bond activation; catalytic activity; chemical bonding; density functional theory; isomerization; ligands; palladium; protonation
Abstract:
... Palladium catalyzed arylthiolation of benzene with 1-(phenylthio) pyrrolidine-2,5-dione to form diaryl sulfide has been studied with the aid of density functional theory (DFT) calculations. Two catalytic cycles (I and II) were considered. In catalytic cycle I, the active species reacts first with benzene, while in catalytic cycle II, the active species reacts first with 1-(phenylthio) pyrrolidine- ...
DOI:
10.1039/c5ra27324b

15. 1-Dimensional fiber-based field-effect transistors made by low-temperature photochemically activated sol–gel metal-oxide materials for electronic textiles

Author:
Park, Chang Jun; Heo, Jae Sang; Kim, Kyung-Tae; Yi, Gyengmin; Kang, Jingu; Park, Jong S.; Kim, Yong-Hoon; Park, Sung Kyu
Source:
RSC advances 2016 v.6 no.22 pp. 18596-18600
ISSN:
2046-2069
Subject:
aluminum oxide; fabrics; indium; temperature; transistors; weaving
Abstract:
... We report the high performance metal-oxide fiber field-effect transistors (F-FETs) for electronic textiles (e-textiles). By using low-temperature and a solution process, dense, pinhole-free, and relatively uniform metal-oxide layers were successfully deposited on a 1-dimensional fiber substrate. Particularly, the atomic layer deposited aluminum oxide gate dielectric layer, deposited at 100 °C, exh ...
DOI:
10.1039/c5ra21613c

16. Dimerization and ligand binding in tyrosylprotein sulfotransferase-2 are influenced by molecular motions

Author:
Singh, Warispreet; Karabencheva-Christova, Tatyana G.; Sparagano, Olivier; Black, Gary W.; Petrov, Petar Y.; Christov, Christo Z.
Source:
RSC advances 2016 v.6 no.22 pp. 18542-18548
ISSN:
2046-2069
Subject:
apoproteins; binding sites; dimerization; enzyme substrates; geometry; hydrophobic bonding; ligands; molecular dynamics; mutants; mutation; peptides; post-translational modification
Abstract:
... Tyrosylprotein sulfotransferase-2 catalyses important, but a less explored posttranslational modification of proteins. The crystallographic structure of the full complex, containing the enzyme, PAPS cofactor and the peptide substrate (WTFC) revealed important structural and atomistic details about the overall structure, binding sites and interactions in TPST-2, but is not informative about the con ...
DOI:
10.1039/c6ra01899h

17. Efficient removal of cadmium using facile functionalized of mesoporous silica via a biomimetic coating

Author:
Chen, Yan; Gao, Junkai; Wen, Xiaofei; Wu, Wenfeng
Source:
RSC advances 2016 v.6 no.22 pp. 18340-18347
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorption; biomimetics; cadmium; coatings; cost effectiveness; ionic strength; pH; porosity; porous media; scanning electron microscopy; silica; sorbents; surface area; transmission electron microscopy
Abstract:
... A mesoporous material (DMOS), prepared by a facile surface modification strategy based on grafting polydopamine onto meso-structured silica (MOS), was developed as a sorbent to sequester Cd²⁺. The method used to modify MOS was simple, facile and cost-effective. The DMOS was characterized by SEM, TEM, XRD, BET and FT-IR, showing that the material had clear multilayer structures, a large surface are ...
DOI:
10.1039/c5ra24735g

18. Extraction of an active enzyme by self-buffering ionic liquids: a green medium for enzymatic research

Author:
Gupta, Bhupender S.; Taha, Mohamed; Lee, Ming-Jer
Source:
RSC advances 2016 v.6 no.22 pp. 18567-18576
ISSN:
2046-2069
Subject:
anions; aqueous solutions; buffers; cations; chymotrypsin; ionic liquids; models; pH; protonation; quaternary ammonium compounds; temperature
Abstract:
... In this work, the extraction of a model enzyme α-chymotrypsin in its active conformation from an aqueous solution by using new biocompatible and self-buffering Good's buffer ionic liquids (GBILs)-based aqueous biphasic systems (ABSs) is demonstrated. The experimental liquid–liquid phase boundary data for these new GBIL-based ABSs were measured at 298.2 K. These new ionic liquids are derived from b ...
DOI:
10.1039/c6ra00607h

19. Fluoride concentration controlled TiO₂ nanotubes: the interplay of microstructure and photocatalytic performance

Author:
Wang, Xueqin; Li, Yanfang; Song, Hua; Huang, Yudong; Su, Ren; Besenbacher, Flemming
Source:
RSC advances 2016 v.6 no.22 pp. 18333-18339
ISSN:
2046-2069
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; chemical composition; crystallography; electric current; electrochemistry; fluorides; ions; mass transfer; microstructure; nanotubes; photocatalysis; rhodamines; scanning electron microscopy; titanium dioxide
Abstract:
... Electrochemical anodization has been considered an efficient technique to prepare highly ordered TiO₂ nanotubes (NTs) for photocatalysis. Most researchers focus on the influence of preparation parameters on the micromorphology of TiO₂ NTs, while the correlation between micro-morphology and the photocatalytic performance of TiO₂ NTs has been ignored to some extent. Fluoride ions in the electrolyte ...
DOI:
10.1039/c5ra24732b

20. Formal [3 + 3] annulation of isatin-derived 2-bromoenals with 1,3-dicarbonyl compounds enabled by Lewis acid/N-heterocyclic carbene cooperative catalysis

Author:
Xu, Junyu; Zhang, Weiguo; Liu, Yishan; Zhu, Suzhen; Liu, Ming; Hua, Xi; Chen, Siyi; Lu, Tao; Du, Ding
Source:
RSC advances 2016 v.6 no.22 pp. 18601-18606
ISSN:
2046-2069
Subject:
Lewis acids; carbenes; catalytic activity
Abstract:
... A series of novel isatin-derived 2-bromoenals were synthesized and applied in a formal [3 + 3] annulation with 1,3-dicarbonyl compounds enabled by a NHC/Lewis acid cooperative catalysis strategy. This newly developed methodology offers rapid access to functionalized spirooxindole δ-lactones. The newly synthesized isatin-derived 2-bromoenals may be further used as potential electrophilic 1,3-syntho ...
DOI:
10.1039/c5ra27848a