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1. Bio-based PBS copolyesters derived from a bicyclic d-glucitol

Author:
Zakharova, Elena; Alla, Abdelilah; Martínez de Ilarduya, Antxon; Muñoz-Guerra, Sebastián
Source:
RSC advances 2015 v.5 no.57 pp. 46395-46404
ISSN:
2046-2069
Subject:
biodegradability; condensation reactions; crystal structure; dioxane; glass transition temperature; glycols; hydrolysis; melting; melting point; microstructure; molecular weight; polybutylene succinate; polyesters; sorbitol; thermal stability
Abstract:
... 2,4:3,5-di-O-methylene-d-glucitol (Glux-diol) was used for the synthesis of poly(butylene succinate) (PBS) copolyesters by melt polycondensation. Glux-diol possess a rigid bicyclic asymmetric structure made of two fused 1,3-dioxane rings and two hydroxyl functions at the end positions. Copolyesters were prepared over the whole range of compositions with molecular weights varying from 26 000 to 46  ...
DOI:
10.1039/c5ra03844h

2. Aggregated Pt–Pd nanoparticles on Nafion membrane for impulsive decomposition of hydrogen peroxide

Author:
Hasnat, Mohammad A.; Rahman, Mohammed M.; Siddiquey, Iqbal A.; Borhanuddin, S. M.; Alam, M. Saiful; Rahman, M. Hamidur; Asiri, Abdullah M.
Source:
RSC advances 2015 v.5 no.57 pp. 46295-46300
ISSN:
2046-2069
Subject:
ambient temperature; catalysts; hydrogen peroxide; nanoparticles; palladium; platinum
Abstract:
... Pt–Pd aggregated nanoparticles were immobilized on a Nafion-117 membrane to decompose hydrogen peroxide. The Pt or Pd particles alone decompose hydrogen peroxide at an insignificant rate. But a bimetallic Pt–Pd catalyst, having a Pt to Pd composition between 0.33 and 0.75, causes steady decomposition at an appreciable rate at room temperature. The Pd and Pt sites have been proposed to initiate and ...
DOI:
10.1039/c5ra05620a

3. An efficient one pot three-component nanocatalyzed synthesis of spiroheterocycles using TiO₂ nanoparticles as a heterogeneous catalyst

Author:
Tailor, Yogesh Kumar; Khandelwal, Sarita; Kumari, Yogita; Awasthi, Kamlendra; Kumar, Mahendra
Source:
RSC advances 2015 v.5 no.57 pp. 46415-46422
ISSN:
2046-2069
Subject:
carbonyl compounds; catalysts; catalytic activity; nanocrystals; nanoparticles; titanium dioxide
Abstract:
... An efficient and environmentally benign isocyanide based domino protocol has been presented for the synthesis of structurally diverse spiroheterocycles, spiroannulated with imidazothiazole and imidazothiadiazole, involving the three component reaction of 2-aminobenzothiazole/2-amino-1,3,4-thiadiazole, cyclohexyl/tert-butyl isocyanides and isatines/cyclic carbonyl compounds catalyzed by recyclable ...
DOI:
10.1039/c5ra04863j

4. Dual amplifying fluorescence anisotropy for detection of respiratory syncytial virus DNA fragments with size-control synthesized metal–organic framework MIL-101

Author:
Guo, Jing Fang; Fang, Rong Mei; Huang, Cheng Zhi; Li, Yuan Fang
Source:
RSC advances 2015 v.5 no.57 pp. 46301-46306
ISSN:
2046-2069
Subject:
DNA fragmentation; Respiratory syncytial virus; anisotropy; coordination polymers; fluorescence; fluorescent dyes; glycerol; hot water treatment; nanomaterials; nucleotide sequences; particle size; single-stranded DNA
Abstract:
... In order to eliminate the scattered light induced by the signal amplifier in fluorescence anisotropy (FA) assays, a nanosized metal–organic framework MIL-101, ranging from 80–500 nm, has been synthesized through a hydrothermal method with the addition of glycerol. We chose the 100 nm MIL-101 to enhance FA for label-free detection of the respiratory syncytial virus (RSV) gene sequence and the DNA-i ...
DOI:
10.1039/c5ra06654a

5. Efficient Au⁰/C catalyst synthesized by a new method for acetylene hydrochlorination

Author:
Tian, Xiaohui; Hong, Guotai; Jiang, BinBo; Lu, Feipeng; Liao, Zuwei; Wang, Jingdai; Yang, Yongrong
Source:
RSC advances 2015 v.5 no.57 pp. 46366-46371
ISSN:
2046-2069
Subject:
X-ray photoelectron spectroscopy; acetylene; catalysts; catalytic activity; gold; oxidation; solvents; temperature; transmission electron microscopy; vacuum drying
Abstract:
... A new impregnation method, involving a mixture of solvents and a vacuum drying process, was used to prepare a gold catalyst (MIV-1Au/C1) for acetylene hydrochlorination. It was found that MIV-1Au/C1 was twice as active as the catalyst prepared through the traditional method (PI-1Au/C1). The new method is green, mild and simple. Moreover, it appears to be controllable by tuning solvent and temperat ...
DOI:
10.1039/c5ra06552f

6. Gold loaded titanium dioxide–carbon nanotube composites as active photocatalysts for cyclohexane oxidation at ambient conditions

Author:
Mohamed, Mohamed Mokhtar
Source:
RSC advances 2015 v.5 no.57 pp. 46405-46414
ISSN:
2046-2069
Subject:
X-ray diffraction; absorption; adsorption; autoxidation; carbon nanotubes; cobalt; cyclohexanones; gas chromatography-mass spectrometry; gold; graphene oxide; hydrogen peroxide; hydrophobicity; nanogold; nanoparticles; nitrogen; oxidants; particle size; photocatalysis; photocatalysts; reflectance spectroscopy; superoxide anion; surface area; temperature; titanium; titanium dioxide; transmission electron microscopy; ultraviolet radiation
Abstract:
... Photocatalytic oxidation of neat cyclohexane (CHA) with H₂O₂ as an oxidant was carried out using gold modified versions of several types of materials, including titania nanotubes (Au/TNT), reduced graphene oxide (Au/RGO) as well as titania nanotubes–multiwalled carbon nanotubes composite (Au/TNT–MWCNT) under UV irradiation (125 W, λ > 296 nm). The synthesized nanoparticles were characterized using ...
DOI:
10.1039/c5ra05253j

7. Impact of fluorine substitution upon the photovoltaic properties of benzothiadiazole-fluorene alternate copolymers

Author:
Cartwright, Luke; Iraqi, Ahmed; Zhang, Yiwei; Wang, Tao; Lidzey, David. G.
Source:
RSC advances 2015 v.5 no.57 pp. 46386-46394
ISSN:
2046-2069
Subject:
absorption; composite polymers; films (materials); fluorenes; fluorine; fluorocarbon polymers; hydrogen; moieties; solar cells
Abstract:
... The effect of fluorine substitution on the ubiquitously-studied, moderate band gap polymer, poly(2,7-fluorene-alt-dithienylbenzothiadiazole) (PFO-DBT) has been investigated by substituting the hydrogen atoms at the 5,6-positions of benzothiadiazole to yield the polymer, PFO-DffBT. An analogous polymer, PFDo-DffBT, with longer chains on the 9H-positions of the fluorene moiety, was synthesised to re ...
DOI:
10.1039/c5ra06076a

8. The behaviour of β-triketimine cobalt complexes in the polymerization of isoprene

Author:
Alnajrani, Mohammed N.; Mair, Francis S.
Source:
RSC advances 2015 v.5 no.57 pp. 46372-46385
ISSN:
2046-2069
Subject:
X-ray diffraction; aluminum; aromatic compounds; catalysts; catalytic activity; cobalt; crosslinking; fluorine; isoprene; ligands; microstructure; molecular weight; polymerization; polymers; stereoselectivity; temperature
Abstract:
... Four new β-triketimine cobalt complexes [(LCo-μ-Br)₂][BArF]₂ where L = N,N′,N′′-triaryl-β-diketimine were synthesised and then characterized by single-crystal X-ray diffraction, MALDI-MS and elemental analysis. In combination with three previously reported, they provided a series of seven subtly different complexes which were screened for activity in the catalysis of isoprene polymerization: the s ...
DOI:
10.1039/c5ra06792h

9. A high performance supercapacitor based on a ceria/graphene nanocomposite synthesized by a facile sonochemical method

Author:
Dezfuli, Amin Shiralizadeh; Ganjali, Mohammad Reza; Naderi, Hamid Reza; Norouzi, Parviz
Source:
RSC advances 2015 v.5 no.57 pp. 46050-46058
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; capacitance; ceric oxide; crystal structure; dielectric spectroscopy; electrochemistry; electrodes; graphene; graphene oxide; nanocomposites; nanoparticles; scanning electron microscopy
Abstract:
... In this work, we have developed a novel nanocomposite material of ceria (CeO₂)–reduced graphene oxide (RGO) by a sonochemical route for application as a symmetric supercapacitor. CeO₂ nanoparticles have been anchored on RGO sheets in order to maximize the specific capacitances of these materials. Nanostructure studies and electrochemical performances of the CeO₂ nanoparticles on the RGO sheets wer ...
DOI:
10.1039/c5ra02957k

10. A novel, rapid and green method of phosphorylation under ultrasound irradiation and catalyst free conditions

Author:
Bouzina, Abdeslem; Belhani, Billel; Aouf, Nour-Eddine; Berredjem, Malika
Source:
RSC advances 2015 v.5 no.57 pp. 46272-46275
ISSN:
2046-2069
Subject:
amines; catalysts; chemical bonding; phosphorylation; rapid methods; solvents; ultrasonic treatment
Abstract:
... The phosphorylation reaction of various N-acylamines, N-acylaminoesters N-acylaminoalcohols and N-acylsulfonamides with trimethylphosphite or triethylphosphite was effectively promoted under ultrasound irradiation, solvent and catalyst free conditions to produce the corresponding amidophosponate. This rapid method produced the products in short reaction times (5–15 min) and excellent yields (75–90 ...
DOI:
10.1039/c5ra06380a

11. Application of aqueous Ag:ZnInSe quantum dots to non-toxic sensitized solar cells

Author:
Wang, Zhao-Chong; Xu, Shu-Hong; Wang, Chun-lei; Zhu, Li; Bo, Fan; Lin, Xiao-Yan; Wang, Zhu-Yuan; Cui, Yi-Ping
Source:
RSC advances 2015 v.5 no.57 pp. 46186-46191
ISSN:
2046-2069
Subject:
adsorption; electrodes; octoxynol; porous media; quantum dots; silver; solar cells; surfactants; titanium dioxide; zinc sulfide
Abstract:
... We report the assembly of non-toxic Ag-doped ZnInSe (AZIS) quantum dot (QD)-sensitized solar cells (QDSSC) with a conversion efficiency of 0.89% at 1 sun. The QDs were directly adsorbed on a TiO₂ film with the addition of a surface-active agent (Triton X-100). ZnS treatment was performed on QDs by the successive ionic layer adsorption and reaction method to inhibit the recombination current in QDS ...
DOI:
10.1039/c5ra04242a

12. A strategy for synthesis of lipid nanoparticles using microfluidic devices with a mixer structure

Author:
Maeki, Masatoshi; Saito, Tatsuyoshi; Sato, Yusuke; Yasui, Takao; Kaji, Noritada; Ishida, Akihiko; Tani, Hirofumi; Baba, Yoshinobu; Harashima, Hideyoshi; Tokeshi, Manabu
Source:
RSC advances 2015 v.5 no.57 pp. 46181-46185
ISSN:
2046-2069
Subject:
lipids; nanoparticles
Abstract:
... Formation behavior of lipid nanoparticles (LNPs) in microfluidic devices with a staggered herringbone micromixer (SHM) structure was investigated. The fundamental role for SHMs in LNP formation was demonstrated by determining such factors as the limiting SHM cycle numbers and the effect of flow rate. The SHM cycle numbers and the position of the first SHM were as significant as factors as the flow ...
DOI:
10.1039/c5ra04690d

13. Bridged-cyclodextrin supramolecular hydrogels: host–guest interaction between a cyclodextrin dimer and adamantyl substituted poly(acrylate)s

Author:
Wang, Jie; Xu, Yisheng; Wang, Yiming; Liu, Jianjia; Xu, Jun; Li, Li; Nguyen, Hanh-Trang; Pham, Duc-Truc; Lincoln, Stephen F.; Guo, Xuhong
Source:
RSC advances 2015 v.5 no.57 pp. 46067-46073
ISSN:
2046-2069
Subject:
calorimetry; crosslinking; cyclodextrins; hydrogels; hydrophobicity; nuclear magnetic resonance spectroscopy; polymers; titration
Abstract:
... The formation of a hydrogel constructed from a cyclodextrin dimer (βCD₂ur) and adamantyl substituted poly(acrylate) was investigated by 2D NOESY ¹H NMR and isothermal titration calorimetry (ITC). The two methods generally demonstrate enhancement of complexation as the length of the hydrophobic tether increases, which is likely to be due to the cooperative effect. An optimal tether length of 6 was ...
DOI:
10.1039/c5ra06163f

14. Ceramic anion-exchange membranes based on microporous supports infiltrated with hydrated zirconium dioxide

Author:
Martí-Calatayud, M. C.; García-Gabaldón, M.; Pérez-Herranz, V.; Sales, S.; Mestre, S.
Source:
RSC advances 2015 v.5 no.57 pp. 46348-46358
ISSN:
2046-2069
Subject:
aluminum oxide; anion-exchange membranes; ceramics; electrical conductivity; electrochemistry; industrial applications; ion exchange; ion exchange capacity; kaolin; porosity; porous media; starch; zirconium oxide
Abstract:
... Anion-exchange membranes made from inexpensive ceramic materials were synthesized by using a simple procedure based on incorporating particles of an ion exchanger into a host microporous structure. Microporous ceramics produced from alumina and kaolin were used as supports, and their internal voids were functionalized by direct precipitation of hydrated ZrO₂. The addition of starch as pore former ...
DOI:
10.1039/c5ra04169d

15. Crosslinking of collagen using a controlled molecular weight bio-crosslinker: β-cyclodextrin polyrotaxane multi-aldehydes

Author:
Liu, Sa; Xie, Renjian; Cai, Jie; Wang, Lin; Shi, Xuetao; Ren, Li; Wang, Yingjun
Source:
RSC advances 2015 v.5 no.57 pp. 46088-46094
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; beta-cyclodextrin; biodegradation; cell adhesion; collagen; collagenase; crosslinking; cytotoxicity; gels; glutaraldehyde; mechanical testing; molecular weight; porosity; rotaxanes; scanning electron microscopes; tissue engineering
Abstract:
... In this study, a series of β-cyclodextrins (β-CD) polyrotaxane multi-aldehydes with different molecular weight were prepared and then were used as crosslinker for collagen. The properties of crosslinked collagen were characterized by Fourier transform infrared spectrophotometry (FTIR), collagenase degradation assay, mechanical testing, scanning electron microscope (SEM) and in vitro cell studies. ...
DOI:
10.1039/c5ra07036h

16. Crystal engineering of ibuprofen using starch derivatives in crystallization medium to produce promising ibuprofen with improved pharmaceutical performance

Author:
Nokhodchi, Ali; Homayouni, Alireza; Araya, Ruta; Kaialy, Waseem; Obeidat, Wasfy; Asare-Addo, Kofi
Source:
RSC advances 2015 v.5 no.57 pp. 46119-46131
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; aqueous solutions; crystallization; crystals; ethanol; hardness; ibuprofen; sodium; starch; viscosity
Abstract:
... Ibuprofen exhibits poor flow, poor compaction and dissolution behaviour, and it is prone to capping after ejection from the die. Therefore, the aim of the present research was to engineer ibuprofen crystals in the presence of two disintegrants (starch and sodium starch glycolate) in order to improve its flow, compactibility and dissolution behaviour simultaneously. To this end ibuprofen and differ ...
DOI:
10.1039/c5ra06183k

17. Designing temperature-memory effects in semicrystalline polyurethane

Author:
Mirtschin, Nikolaus; Pretsch, Thorsten
Source:
RSC advances 2015 v.5 no.57 pp. 46307-46315
ISSN:
2046-2069
Subject:
cooling; deformation; heat; melting; polyurethanes; temperature; urethane; wide-angle X-ray scattering
Abstract:
... Temperature-memory polymers are able to generate a substantial mechanical response when heated above the temperature, at which a preceding deformation was carried out. Here we show how to design the temperature-memory effect (TME) by thermomechanical treatment. As a model polymer, phase segregated poly(ester urethane) (PEU) containing crystallizable segments of poly(1,4-butylene adipate) (PBA) was ...
DOI:
10.1039/c5ra05492c

18. Effect of molecular chain length on the properties of amine-functionalized graphene oxide nanosheets/epoxy resins nanocomposites

Author:
Liu, Fengdan; Wu, Ling; Song, Yanjie; Xia, Wenguang; Guo, Kunkun
Source:
RSC advances 2015 v.5 no.57 pp. 45987-45995
ISSN:
2046-2069
Subject:
amines; chemical bonding; crosslinking; epoxides; graphene oxide; mixing; molecular weight; nanosheets; polymer nanocomposites; polymers; resins; thermal properties
Abstract:
... Amine-functionalized graphene oxide nanosheets (D400-GOs and D2000-GOs) were prepared by linear poly(oxyalkylene)amines with two different molecular weights, 400 and 2000 (D400 and D2000), attached onto the surface of graphene oxides via the reactions of amines with alkylcarboxyle groups. By mixing the amine-functionalized graphene oxide nanosheets, the epoxy resins (EPs) and curing agent, the ami ...
DOI:
10.1039/c5ra02013a

19. Effect of the nature of a transition metal dopant in BaTiO₃ perovskite on the catalytic reduction of nitrobenzene

Author:
Srilakshmi, Chilukoti; Rao, G. Mohan; Saraf, Rohit
Source:
RSC advances 2015 v.5 no.57 pp. 45965-45973
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; amines; barium titanate; catalysts; catalytic activity; chelating agents; chemical reduction; cobalt; iron; nickel; nitrobenzenes; oxalic acid; particle size; physicochemical properties; surface area; synthesis; titration; transmission electron microscopy
Abstract:
... In the present study, we have synthesized Fe, Co and Ni doped BaTiO₃ catalyst by a wet chemical synthesis method using oxalic acid as a chelating agent. The concentration of the metal dopant varies from 0 to 5 mol% in the catalysts. The physical and chemical properties of doped BaTiO₃ catalysts were studied using various analytical methods such as X-ray diffraction (XRD), Fourier transform infrare ...
DOI:
10.1039/c5ra06864a

20. Efficient organo-photocatalysis system of an n-type perylene derivative/p-type cobalt phthalocyanine bilayer for the production of molecular hydrogen from hydrazine

Author:
Abe, Toshiyuki; Tanno, Yoshinori; Taira, Naohiro; Nagai, Keiji
Source:
RSC advances 2015 v.5 no.57 pp. 46325-46329
ISSN:
2046-2069
Subject:
cobalt; energy; hydrazine; hydrogen; light; nitrogen; photocatalysis; stoichiometry
Abstract:
... The stoichiometric decomposition of hydrazine (N₂H₄) into N₂ and H₂ was observed to occur efficiently in a photocatalysis system of an organic p–n bilayer. The primary feature of the present system is that the entire visible-light energy spectrum can be utilised for N₂H₄ decomposition. Furthermore, this paper presents the first demonstration of H₂ formation by the reducing power photogenerated at ...
DOI:
10.1039/c5ra03842a