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1. A concise protecting-group-free synthesis of cephalosporolides E and F

Author:
Chaudhari, Dipali A.; Kattanguru, Pullaiah; Fernandes, Rodney A.
Source:
RSC advances 2015 v.5 no.52 pp. 42131-42134
ISSN:
2046-2069
Subject:
lactones; olefin; regioselectivity
Abstract:
... A concise protecting-group-free synthesis of cephalosporolides E and F has been described. The key steps involve the one-pot conversion of l-mannonic-γ-lactone to γ-vinyl-β-hydroxy-γ-lactone, cross-metathesis and Wacker-type oxidative spiroketalization. The internal olefin served as a latent keto functionality with excellent delivery of a regioselective keto group for spiroketalization. The synthe ...
DOI:
10.1039/c5ra06991b

2. Bioapplication of graphene oxide derivatives: drug/gene delivery, imaging, polymeric modification, toxicology, therapeutics and challenges

Author:
Nurunnabi, Md; Parvez, Khaled; Nafiujjaman, Md; Revuri, Vishnu; Khan, Haseeb A.; Feng, Xinliang; Lee, Yong-kyu
Source:
RSC advances 2015 v.5 no.52 pp. 42141-42161
ISSN:
2046-2069
Subject:
biochemical compounds; biocompatibility; bioengineering; bioimaging; biosafety; cadmium; cell lines; chemical structure; disease diagnosis; drug delivery systems; drugs; electronics; gene transfer; graphene; graphene oxide; medicine; neoplasms; polymers; quantum dots; semiconductors; solar cells; surgery; tellurium; toxicity; toxicology
Abstract:
... Due to the wide range and various applications of graphene in multidisciplinary fields, such as electronics, solar cells, biomedicine, bioengineering, drug delivery, gene delivery and semiconductors, graphene and its derivatives have attracted most significant interest of diverse group of scientists in the last decades. Besides numerous applications in electrical and mechanical fields, their non-i ...
DOI:
10.1039/c5ra04756k

3. Enhanced lithium storage property of Na-doped Li₂Na₂Ti₆O₁₄ anode materials for secondary lithium-ion batteries

Author:
Lao, Mengmeng; Li, Peng; Lin, Xiaoting; Shao, Lianyi; Shui, Miao; Long, Nengbing; Wang, Dongjie; Shu, Jie
Source:
RSC advances 2015 v.5 no.52 pp. 41999-42008
ISSN:
2046-2069
Subject:
anodes; crystallization; electrochemistry; lithium; lithium batteries; particle size; sodium
Abstract:
... In this paper, a series of Na-doped Li₂Na₂Ti₆O₁₄ samples are synthesized by a simple solid-state reaction method through Li-site substitution with Na. Morphology observation shows that all five materials are well crystallized with a particle size in the range of 150–300 nm. Electrochemical analysis shows that Li₁.₉₅Na₂.₀₅Ti₆O₁₄ exhibits lower charge–discharge polarization (0.05 V) than that (0.11 ...
DOI:
10.1039/c5ra04427h

4. Enhanced visible-light-driven photocatalytic performances using Bi₂WO₆/MS (M = Cd, Zn) heterostructures: facile synthesis and photocatalytic mechanisms

Author:
Tang, Rongfeng; Su, Huaifen; Duan, Shengxia; Sun, Yuanwei; Li, Lei; Zhang, Xianxi; Zeng, Suyuan; Sun, Dezhi
Source:
RSC advances 2015 v.5 no.52 pp. 41949-41960
ISSN:
2046-2069
Subject:
3-mercaptopropionic acid; X-ray diffraction; X-ray photoelectron spectroscopy; ammonium oxalate; benzoquinones; cadmium; cadmium sulfide; hydroxyl radicals; microstructure; nanoparticles; photocatalysis; rhodamines; scanning electron microscopy; semiconductors; silver nitrate; superoxide anion; transmission electron microscopy; zinc; zinc sulfide
Abstract:
... The formation of type II heterostructures is proved to be an effective method to improve the photocatalytic performance of semiconductors. In this report, a surface functionalization method using 3-mercaptopropionic acid (MPA) as the surface functionalizing agent was adopted for the fabrication of Bi₂WO₆/MS (M = Cd and Zn) heterostructures. The composition and microstructures of the as-prepared he ...
DOI:
10.1039/c5ra04655f

5. Role of propane sultone as an additive to improve the performance of a lithium-rich cathode material at a high potential

Author:
Pires, Julie; Timperman, Laure; Castets, Aurore; Peña, Jésus Santos; Dumont, Erwan; Levasseur, Stéphane; Dedryvère, Rémi; Tessier, Cécile; Anouti, Mérièm.
Source:
RSC advances 2015 v.5 no.52 pp. 42088-42094
ISSN:
2046-2069
Subject:
cathodes; cobalt; electric potential difference; electrolytes; manganese; nickel; propane
Abstract:
... This study presents the use of 1,3-propane sultone (PS) in the [EC–DMC + 1 mol L⁻¹ LiPF₆] electrolyte as a protective additive for the Li-rich-NMC xLi₂MnO₃–(1 − x)LiMO₂ (x ≫ 1; M = Ni, Co, Mn) cathode–electrolyte interface during cathode material activation and cycling at a high potential (5 V vs. Li). The results showed that the presence of 1% PS (w/w) ensured complete and better electrode activa ...
DOI:
10.1039/c5ra05650k

6. A consensus subunit-specific model for annotation of substrate specificity for ABC transporters

Author:
Hu, Yayun; Guo, Yanzhi; Shi, Yinan; Li, Menglong; Pu, Xuemei
Source:
RSC advances 2015 v.5 no.52 pp. 42009-42019
ISSN:
2046-2069
Subject:
ABC transporters; amino acids; computational methodology; data collection; drugs; enzymes; lipids; nutrients; prediction; substrate specificity; sugars; toxins
Abstract:
... Members of the ATP-binding cassette (ABC) transporter family are present in three kingdoms of life and play a vital role in most cellular functions. ABC transporters function as either importers that bring nutrients and other molecules into cells, or as exporters that pump toxins, drugs and lipids across membranes. Currently, the limitation of 3D structures highlights the importance of the functio ...
DOI:
10.1039/c5ra05304h

7. Biodegradable polylactide based materials with improved crystallinity, mechanical properties and rheological behaviour by introducing a long-chain branched copolymer

Author:
Liu, Ming-Jing; Chen, Si-Chong; Yang, Ke-Ke; Wang, Yu-Zhong
Source:
RSC advances 2015 v.5 no.52 pp. 42162-42173
ISSN:
2046-2069
Subject:
biodegradability; composite polymers; copolymerization; crystal structure; crystallization; differential scanning calorimetry; droplets; lactones; light microscopy; mechanical properties; polylactic acid; rheological properties; transmission electron microscopy
Abstract:
... Herein we developed a novel strategy for preparing biodegradable polylactide (PLA) based materials with improved crystallinity, mechanical properties and rheological behaviour by introducing a long-chain branched block copolymer (LB-PCLA) of PLA and poly-ε-caprolactone (PCL). The LB-PCLA copolymer was synthesized by single hydroxyl-terminated PLA (PLA-OH) and three hydroxyl-terminated PCL (PCL-3OH ...
DOI:
10.1039/c5ra04742k

8. Cadmium selenide quantum dots solar cells featuring nickel sulfide/polyaniline as efficient counter electrode provide 4.15% efficiency

Author:
Yue, Gentian; Tan, Furui; Wu, Jihuai; Li, Fumin; Lin, Jianming; Huang, Miaoliang; Zhang, Weifeng
Source:
RSC advances 2015 v.5 no.52 pp. 42101-42108
ISSN:
2046-2069
Subject:
cadmium; catalytic activity; dielectric spectroscopy; electrochemistry; electrodes; electrolytes; lighting; nickel; platinum; polyaniline; quantum dots; selenides; solar cells; tin dioxide; titanium dioxide
Abstract:
... Nickel sulfide decorated polyaniline (NiS/PANI) co-deposition onto fluorine-doped tin oxide (FTO) substrate using an in situ electropolymerization route and served as the counter electrode (CE) for polysulfide electrolyte in cadmium selenide (CdSe) quantum dots sensitized solar cells (QDSSCs). The NiS/PANI CE provided great electrocatalytic activity and lower charge-transfer resistance compared to ...
DOI:
10.1039/c5ra02867a

9. Correction: Synergistic effect of carbon fibers and carbon nanotubes on improving thermal stability and flame retardancy of polypropylene: a combination of a physical network and chemical crosslinking

Author:
Gong, Jiang; Niu, Ran; Wen, Xin; Yang, Hongfan; Liu, Jie; Chen, Xuecheng; Sun, Zhao-Yan; Mijowska, Ewa; Tang, Tao
Source:
RSC advances 2015 v.5 no.52 pp. 42054
ISSN:
2046-2069
Subject:
carbon fibers; carbon nanotubes; crosslinking; polypropylenes; thermal stability
Abstract:
... Correction for ‘Synergistic effect of carbon fibers and carbon nanotubes on improving thermal stability and flame retardancy of polypropylene: a combination of a physical network and chemical crosslinking’ by Jiang Gong et al., RSC Adv., 2015, 5, 5484–5493. ...
DOI:
10.1039/c5ra90045j

10. Design and application of the recyclable poly(l-proline-co-piperidine) catalyst for the synthesis of mesityl oxide from acetone

Author:
Xu, Lin; Huang, Jiejun; Liu, Yubing; Wang, Yining; Xu, Bolian; Ding, Kehong; Ding, Yuanhua; Xu, Qing; Yu, Lei; Fan, Yining
Source:
RSC advances 2015 v.5 no.52 pp. 42178-42185
ISSN:
2046-2069
Subject:
acetone; chemical industry; organocatalysts; piperidines; polymers; proline
Abstract:
... Unexpectedly, l-proline/piperidine was found to be a better recyclable catalyst system than l-proline or piperidine alone in the condensation of acetone to prepare mesityl oxide (MO), an important intermediate in the chemical industry. Binding the catalyst system onto polymer resin enhanced the MO selectivity and reduced the catalyst loss. The mechanism of the bi-component catalyst system was also ...
DOI:
10.1039/c5ra05741h

11. Disposable ionic liquid-coated etched stainless steel fiber for headspace solid-phase microextraction of organophosphorus flame retardants from water samples

Author:
Kang, Haiyan; Mao, Yanli; Wang, Xianli; Zhang, Yan; Wu, Junfeng; Wang, Hongqiang
Source:
RSC advances 2015 v.5 no.52 pp. 41934-41940
ISSN:
2046-2069
Subject:
coatings; detection limit; flame retardants; gas chromatography; headspace analysis; photometry; solid phase microextraction; stainless steel; standard deviation
Abstract:
... A simple and sensitive method for determining organophosphorus flame retardants (PFRs) in water samples was first developed based on headspace solid-phase microextraction (HS-SPME) using an ionic liquid-coated etched stainless steel (IL-ESS) fiber followed by a gas chromatography-flame photometric detector (GC-FPD). The etched stainless steel wire, whose rough and porous structure could not only a ...
DOI:
10.1039/c5ra03504j

12. Electrospinning of a PMA-co-PAA/FP biopolymer nanofiber: enhanced capability for immobilized horseradish peroxidase and its consequence for p-nitrophenol disposal

Author:
Li, Changlong; Zhou, Lei; Wang, Cuie; Liu, Xinhua; Liao, Kaiming
Source:
RSC advances 2015 v.5 no.52 pp. 41994-41998
ISSN:
2046-2069
Subject:
biopolymers; catalysts; environmental protection; immobilized enzymes; nanofibers; p-nitrophenol; pH; peroxidase; polypeptides; temperature
Abstract:
... In this study, a novel poly(methyl acrylate-co-acrylic acid)/feather polypeptide (PMA-co-PAA/FP) composite nanofiber, which was prepared via the electrospinning technique, was employed as a support for scalable immobilization of horseradish peroxidase (HRP) for the first time. The resulting PMA-co-PAA/FP–HRP can function as an active and recyclable nanobiocatalyst for p-nitrophenol (PNP) disposal, ...
DOI:
10.1039/c5ra05626h

13. Environmentally benign bio-inspired synthesis of Au nanoparticles, their self-assembly and agglomeration

Author:
Raliya, Ramesh; Biswas, Pratim
Source:
RSC advances 2015 v.5 no.52 pp. 42081-42087
ISSN:
2046-2069
Subject:
Solanum lycopersicum; chlorides; cysteine; gold; leaves; nanogold; nanoparticles; pH; temperature; thiols; tomatoes; toxic substances; toxicity; transmission electron microscopy
Abstract:
... The synthesis and characterization of stable gold nanoparticles (Au NPs) from gold chloride in soluble protein extracts of tomato (Solanum lycopersicum L.) leaves is demonstrated. This approach is a completely “green” synthetic method, which is simple, environmentally benign, and efficient, in contrast to conventional approaches that use toxic or hazardous chemicals, high temperature, pressure, an ...
DOI:
10.1039/c5ra04569j

14. Evaluation of methionine and tryptophan derivatised vehicles: Met-ac-TE3A/Trp-ac-TE3A for tumor imaging

Author:
Singh, Sweta; Tiwari, Anjani K.; Varshney, Raunak; Mathur, Rashi; Hazari, Puja P.; Singh, B.; Mishra, Anil K.
Source:
RSC advances 2015 v.5 no.52 pp. 41977-41984
ISSN:
2046-2069
Subject:
blood serum; cell lines; humans; image analysis; metal ions; methionine; mice; muscles; neoplasms; pharmacokinetics; rabbits; therapeutics; thermodynamics; tracer techniques; tryptophan
Abstract:
... Two novel amino acid (methionine and tryptophan) appended 1,4,8,11-tetraazacyclotetradecane triacetate (TE3A) compounds Met-ac-TE3A and Trp-ac-TE3A were synthesized and evaluated for imaging applications. The pharmacokinetics of these compounds was analyzed by ⁹⁹ᵐTc labeled tracer methods. In vitro human serum stability of ⁹⁹ᵐTc labeled Met-ac-TE3A/Trp-ac-TE3A was found to be 96.5% and 96.0% after ...
DOI:
10.1039/c5ra07138k

15. Formation of ammonium in saline solution treated by nanosecond pulsed cold atmospheric microplasma: a route to fast inactivation of E. coli bacteria

Author:
Maheux, Simon; Duday, David; Belmonte, Thierry; Penny, Christian; Cauchie, Henry-Michel; Clément, Franck; Choquet, Patrick
Source:
RSC advances 2015 v.5 no.52 pp. 42135-42140
ISSN:
2046-2069
Subject:
Escherichia coli; ambient temperature; ammonium; bacteria; cold; nitrogen; nonthermal processing; pH; sodium chloride
Abstract:
... He/N₂ cold atmospheric plasma treatment of E. coli suspension leads to a fast and efficient inactivation process. Significant generation of ammonium is reported. The formation of NH₄⁺ species in saline solution treated by cold atmospheric plasma is proposed for the first time as the main process responsible for the fast bacterial inactivation in pH-buffered solutions, at ambient temperature and ph ...
DOI:
10.1039/c5ra01109d

16. Ga-based magnetic fluid with Al₂O₃-coated Ni nanoparticles

Author:
Zhao, Shuchun; Yang, Chuncheng; Bian, Xiufang; Guo, Tongxiao; Yu, Mengchun
Source:
RSC advances 2015 v.5 no.52 pp. 41961-41966
ISSN:
2046-2069
Subject:
heat treatment; liquids; magnetic properties; magnetism; nanoparticles; nickel
Abstract:
... Five kinds of metal-based magnetic fluids were prepared by dispersing different kinds of Ni nanoparticles (NPs) into liquid Ga: (a) neat Ni NPs, (b) Al₂O₃-coated Ni NPs, (c) SiO₂-coated Ni NPs, (d) Ni NPs after 573 K heat treatment, (e) Ni NPs after 673 K heat treatment. The stabilities and magnetic properties of the five different magnetic fluids were characterized. The saturation magnetizations ...
DOI:
10.1039/c5ra02453f

17. Hollow Co₃O₄ microspheres with nano-sized shells: one-step large-scale synthesis, growth mechanism and supercapacitor properties

Author:
Feng, Chao; Zhang, Jinfeng; Deng, Yida; Zhong, Cheng; Liu, Lei; Hu, Wenbin
Source:
RSC advances 2015 v.5 no.52 pp. 42055-42062
ISSN:
2046-2069
Subject:
X-ray diffraction; capacitance; cobalt oxide; electrochemistry; hydrogen peroxide; microparticles; nitrates; scanning electron microscopes; scanning electron microscopy; temperature; transmission electron microscopes; transmission electron microscopy
Abstract:
... Hollow Co₃O₄ microspheres with thin spherical shells were produced using a one-step method at a low hydrothermal temperature (120 °C), and could be obtained without the use of a solid template, organic reagent or subsequent calcination. These hollow Co₃O₄ microspheres possess a diameter of ca. 500 nm and a thin shell thickness of ca. 50 nm. The samples were characterized by field emission scanning ...
DOI:
10.1039/c5ra03052h

18. Leveling graphene sheets through electrospinning and their conductivity

Author:
Wang, Yao; Tang, Jianguo; Xie, Shiqiang; Liu, Jixian; Xin, Zhichao; Liu, Xiaoling; Belfiore, Laurence A.
Source:
RSC advances 2015 v.5 no.52 pp. 42174-42177
ISSN:
2046-2069
Subject:
graphene; graphene oxide; nanofibers; polyacrylonitrile; polyvinylpyrrolidone; reducing agents; vapors
Abstract:
... This study provided a strategy to extend and level easily-curved graphene sheets through electrospinning. A suspension of graphene oxide (GO) sheets in polar polymers, such as polyacrylonitrile (PAN) and polyvinyl pyrrolidone (PVP), was first electrospun into a composite network in which the GO sheets were sandwiched and leveled under the drag force of the electrospun nanofibers at the surface and ...
DOI:
10.1039/c5ra01922b

19. Multifunctional polyelectrolyte multilayers coated onto Gd₂O₃:Yb³⁺,Er³⁺@MSNs can be used as drug carriers and imaging agents

Author:
Huang, Shanshan; Cheng, Ziyong; Chen, Yinyin; Liu, Bei; Deng, Xiaoran; Ma, Ping'an; Lin, Jun
Source:
RSC advances 2015 v.5 no.52 pp. 41985-41993
ISSN:
2046-2069
Subject:
bioimaging; breast neoplasms; coatings; cytotoxicity; doxorubicin; drug therapy; electrolytes; luminescence; magnetic resonance imaging; nanocarriers; nanocomposites; nanoparticles; neoplasm cells; porous media; silica; sol-gel processing; styrene; sulfonates
Abstract:
... Mesoporous silica nanoparticles (MSNs) were firstly functionalized with upconversion luminescent Gd₂O₃:Yb³⁺,Er³⁺via the Pechini sol–gel method. Then, polyelectrolyte multilayers (PEM) composed of poly(allyamine hydrochloride) (PAH) and poly(styrene sulfonate) (PSS) were coated onto the Gd₂O₃:Yb³⁺,Er³⁺@MSNs using a layer-by-layer (LbL) technique to achieve the pH-responsive properties of the nanoca ...
DOI:
10.1039/c5ra01750e

20. Ordering and dynamics of oligo(phenylene ethynylene) self-assembled monolayers on Au(111)

Author:
Wu, Hairong; Sotthewes, Kai; Schön, Peter M.; Vancso, G. Julius; Zandvliet, Harold J. W.
Source:
RSC advances 2015 v.5 no.52 pp. 42069-42074
ISSN:
2046-2069
Subject:
gold; periodicity; scanning tunneling microscopy
Abstract:
... Self-assembled monolayers of 4-[4′-(phenylethynyl)-phenylethynyl]-benzenethiolate (PPB-S) molecules on flame annealed Au(111) have been investigated by ultra-high vacuum scanning tunneling microscopy. We have found a hitherto unknown self-assembled monolayer phase. This phase consists of a fine-striped pattern that is aligned along the close packed 〈11̄0〉 directions of the Au(111) surface. The fin ...
DOI:
10.1039/c5ra03577e