- Electrochemical synthesis and: In vitro cytotoxicity study of copper(ii) carboxylates with different fatty acid alkyl chain lengths
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In the present study, an electrochemical technique based on the release of Cu2+ ions from a Cu anode in the presence of unsaturated fatty acids with different alkyl chain lengths has been used to synthesize Cu(ii) carboxylates. The fatty acids used in this study are lauric acid (C12:0) and stearic acid (C18:0). Optimum electrolysis conditions for the synthesis of Cu(ii) laurate (CuLa2) and Cu(ii) stearate (CuSt2) have been determined to maximize percentage yield and minimize energy consumption and loss of the Cu anode. We observe that both compounds (99.21%) are produced with lower energy consumption (～21.01 W h L-1) and anode loss (～0.57 mg L-1) by using the same optimum conditions of 10 V of applied voltage for 4 hours of electrolysis time in 0.1 M CH3COONH4 electrolyte solution. The cytotoxicity study on selected tumor cells (A549 and HeLa) shows that the synthesized compounds have moderate cytotoxic effects with IC50 in the range from 19.50 to 44.67 μM. CuLa2 with C12 alkyl chains provides better cytotoxicity effect on the selected tumor cells due to lower IC50 than CuSt2 with C18 alkyl chains. This shows that the length of alkyl chain also affects the compound toxicity towards selected tumor cells.
- Nordin, Norazzizi,Yahaya, Badrul Hisham,Yusop, Muhammad Rahimi
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supporting information
p. 15127 - 15135
(2018/09/29)
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- Tailoring Catalytic Properties of Copper Manganese Oxide Nanoparticles (Hopcalites-2G) via Flame Spray Pyrolysis
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Humidity tolerant copper manganese oxide catalysts of the second generation (“Hopcalites-2G”) were produced by flame spray pyrolysis process (FSP) and their catalytic activity for carbon monoxide oxidation under dry and humid conditions was evaluated. The effects of synthesis parameters such as flame specific variables (OFR=oxygen to fuel ratio, sheath gas, reactor) and the precursor specifications (composition, concentration, solvent) were investigated systematically. From the findings of the synthesis variations, it was possible to identify key factors decisive to achieve a high catalytic activity for CO oxidation under humid conditions. The most important characteristics are phase composition, specific surface area and the carbon content to achieve increased long-term stability of the flame made catalysts under humid conditions. A high productivity in the flame-based Hopcalite synthesis was achieved with catalysts performances similar or better than that of the commercial Hopcalite catalyst Carulite 300 (CARUS). The most active catalyst showed 50 % higher CO conversion after one hour on stream at 50 °C and humid conditions compared with the reference. The latter is a crucial step towards an improved humidity tolerance of Hopcalite catalysts in respiratory filter applications.
- Wegner, Karl,Medicus, Maximilian,Schade, Elke,Grothe, Julia,Kaskel, Stefan
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p. 3914 - 3922
(2018/08/06)
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- P-type Cu7Te5 single-crystalline nanocuboids: Size-controlled synthesis and large-scale self-assembly
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Cu7Te5 single-crystalline nanocuboids have been synthesized by a low-temperature solvothermal strategy, using environmentally friendly chemicals. The size, from nanometer to sub-micrometer, was controlled by adjusting the dodecanethiol (DDT) concentration. Through DDT capping, which induced appropriate van der Waals interactions, the alignment of the nanocuboids led to large-scale self-assembly of superstructures or supracrystals. The UV-vis-NIR spectra of the as-prepared nanocuboid colloid exhibited potential LSPR properties. Measurement of the Mott-Schottky impedance potential curve confirmed the p-type conductivity of the as-prepared Cu7Te5 nanocuboids. This journal is
- Dai, Baosong,Zhao, Qian,Gui, Jing,Zhang, Jiatao,Zhu, Hesun
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p. 9441 - 9445
(2015/02/19)
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- Characterisation of metal carboxylates by Raman and infrared spectroscopy in works of art
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This work introduces the complementary use of μ-Raman and μ-Fourier transform infrared (IR) spectroscopy for the detection of specific carbon chains and cations for the identification of metal carboxylates within oil paint microsamples. Metal carboxylates (metal soaps) form naturally when free fatty acids react with metal cations and may also be found as additives or degradation products. Twenty-two metal carboxylates were synthesised, and their spectra assembled in a reference database. Metal salts of cations commonly present in oil paintings were used, including lead, zinc, calcium, cadmium, copper and manganese. The fatty acids selected were the saturated acids palmitic (C1 6:0) and stearic (C18:0) and the polyunsaturated oleic acid (C1 8:1). Azelaic acid (C9 diacid), a product resulting from autoxidation of polyunsaturated acids, was also included. Metal carboxylates were characterised by Raman and IR spectroscopy, and their structures were confirmed by X-ray diffraction. Raman and IR spectroscopy proved to be complementary techniques for a full identification of the metal carboxylates in complex aged paint. Raman enables the differentiation of the carbon chain length in the C-C stretching region (1120-1040 cm-1), and IR distinguishes the metal cation in the COO- stretching absorption region (1650-1380cm-1). Principal component analysis was applied to the spectra in order to facilitate a fast and accurate method to discriminate between the different metal carboxylates and to aide in their identification. Finally, spectra from case studies were successfully projected in the principal component analysis models built, enabling a higher confidence level for the identification of copper palmitate and copper azelate in two 19th-century Portuguese oil paintings.
- Otero, Vanessa,Sanches, Diogo,Montagner, Cristina,Vilarigues, Mrcia,Carlyle, Leslie,Lopes, Joo A.,Melo, Maria J.
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p. 1197 - 1206
(2015/02/19)
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- Synthesis and self-assembly of triangular Cu2-xSe nanocrystals
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High quality triangular Cu2-xSe nanocrystals were successfully synthesized through a green phosphine free route by the non-injection one-pot colloidal approach with Se-octadecene (ODE) as a precursor. CuSt2 was used as reactant and oleylamine (OAM) was used as reaction solvent. By using this new non-injection method, triangle shaped Cu2-xSe nanocrystals with sizes ranging from 2.8 to 12 nm were achieved by simply controlling the reaction time. Transmission electron microscopy (TEM) and high resolution TEM (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray (EDX) measurements were used to characterize as-synthesized nanocrystals. Cubic berzelianite crystal phase and narrow size distributions were demonstrated by the results. Additionally, the narrow size distribution promoted as-synthesized Cu2-xSe nanocrystals self-assembled into ordered superstructures with the assistance of OAM.
- Tian, Guimin,Zhao, Taotao,Niu, Jinzhong,Shen, Huaibin,Li, Lin Song
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p. 39547 - 39551
(2014/12/09)
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- Surface plasmon resonance enhanced light absorption and photothermal therapy in the second near-infrared window
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Enhanced near-field at noble metal nanoparticle surfaces due to localized surface plasmon resonance (LSPR) has been researched in fields ranging from biomedical to photoelectrical applications. However, it is rarely explored on nonmetallic nanomaterials discovered in recent years, which can also support LSPR by doping-induced free charge carriers, let alone the investigation of an intricate system involving both. Here we construct a dual plasmonic hybrid nanosystem Au-Cu9S5 with well controlled interfaces to study the coupling effect of LSPR originating from the collective electron and hole oscillations. Cu9S5 LSPR is enhanced by 50% in the presence of Au, and the simulation results confirm the coupling effect and the enhanced local field as well as the optical power absorption on Cu9S5 surface. This enhanced optical absorption cross section, high photothermal transduction efficiency (37%), large light penetration depth at 1064 nm, excellent X-ray attenuation ability, and low cytotoxicity enable Au-Cu9S5 hybrids for robust photothermal therapy in the second near-infrared (NIR) window with low nanomaterial dose and laser flux, making them potential theranostic nanomaterials with X-ray CT imaging capability. This study will benefit future design and optimization of photoabsorbers and photothermal nanoheaters utilizing surface plasmon resonance enhancement phenomena for a broad range of applications.
- Ding, Xianguang,Liow, Chi Hao,Zhang, Mengxin,Huang, Renjun,Li, Chunyan,Shen, He,Liu, Mengya,Zou, Yu,Gao, Nan,Zhang, Zhijun,Li, Yonggang,Wang, Qiangbin,Li, Shuzhou,Jiang, Jiang
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p. 15684 - 15693
(2015/01/09)
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- Ligand chain length conveys thermochromism
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Thermochromic properties of a series of non-ionic copper compounds have been reported. Herein, we demonstrate that Cu(ii) ion with straight-chain primary amine (A) and alpha-linolenic (fatty acid, AL) co-jointly exhibit thermochromic properties. In the current case, we determined that thermochromism becomes ligand chain length-dependent and at least one of the ligands (A or AL) must be long chain. Thermochromism is attributed to a balanced competition between the fatty acids and amines for the copper(ii) centre. The structure-property relationship of the non-ionic copper compounds Cu(AL) 2(A)2 has been substantiated by various physical measurements along with detailed theoretical studies based on time-dependent density functional theory. It is presumed from our results that the compound would be a useful material for temperature-sensor applications. This journal is the Partner Organisations 2014.
- Ganguly, Mainak,Panigrahi, Sudipa,Chandrakumar,Sasmal, Anup Kumar,Pal, Anjali,Pal, Tarasankar
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p. 11624 - 11636
(2014/07/22)
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- Influence of doping on semiconductor nanocrystals mediated charge transfer and photocatalytic organic reaction
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Doped and undoped ZnS semiconductor nanocrystals having different recombination pathways are explored to study the charge transfer reaction between the nanocrystals and the 4-nitrophenol/sodium borohydride redox couple.
- Sarkar, Suresh,Guria, Amit K.,Pradhan, Narayan
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supporting information
p. 6018 - 6020
(2013/07/27)
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- Facile solution-phase synthesis of CuInSe2 nanocrystals with controlled morphologies
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The morphology of CuInSe2 nanocrystals plays a key role in their functional properties. Achieving controllable morphology is significant for studying their structures and novel properties. Here, CuInSe2 nanocrystals with a trigonal-pyramidal shape have successfully been synthesized by a facile solution-phase method. The nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), etc. The morphological evolution of the CuInSe2 nanocrystals was illustrated by tuning the injection temperature of oleylamine-selenium (OAm-Se). In addition, CuInSe2 nanocrystals with spherical and ellipsoidal shapes were also obtained when copper stearate was used as the copper precursor. CuInSe2 nanocrystals with a trigonal-pyramidal shape were successfully synthesized by a facile solution-phase route. When copper stearate was used as the precursor, a spherical shape was obtained, and this further evolved into an ellipsoid by tuning the concentration of oleylamine. The results demonstrate that precise control of the morphology of CuInSe2 nanocrystals can be achieved.
- Bai, Tianyu,Li, Feifei,Huang, He,Wang, Zhaorui,Shi, Zhan,Li, Chunguang,Wang, Ge,Feng, Shouhua
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supporting information
p. 5906 - 5910
(2013/12/04)
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- Facile synthesis and optical properties of ultrathin Cu-doped ZnSe nanorods
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Successful doping of anisotropic semiconductor nanocrystals with impurities offers an effective pathway to manipulate their physical properties and enhance the application performances. However, such doping into anisotropic nanocrystals is seldom reported because it needs simultaneous controls in the crystal growth for a specific shape and composition engineering for transition-metal doping. Here, ultrathin Cu-doped ZnSe nanorods are synthesized by a growth-doping process. The doped nanorods are characterized by XRD and TEM techniques to reveal their crystal structure. Their optical properties are described in terms of UV-Vis absorption spectra and PL spectra. The tunable emission from 480 to 520 nm evidences the successful doping of Cu into ZnSe nanorods. The effects of the reaction time, the reaction temperature and the surface ligand on the optical properties are discussed in detail. After purification, the doped nanorods with a Cu/Zn ratio of 1% give a quantum yield of 7%. This emission could be retained for weeks in air, which is important for its future applications in many fields.
- Kou, Shufang,Yao, Tingting,Xu, Xiaofeng,Zhu, Rui,Zhao, Qing,Yang, Jian
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p. 10495 - 10499
(2013/12/04)
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- FATTY ACID METAL SALT FOR FORMING ULTRAFINE METAL PARTICLE
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A fatty acid metal salt used for forming ultrafine metal particles satisfying at least one of that: (i) the water content is 200 ppm or less; (ii) the volume-cumulative particle diameter D90 is 80 μm or smaller as measured by the particle size distribution measuring method of the laser diffraction/scattering type; or (iii) a metal of an atomic weight of 50 to 200 is contained, and the amount of the unreacted substance or the by-product is 4.0 mol% or less when the fatty acid metal salt is formed. The fatty acid metal salt can be favorably used for forming ultrafine metal particles in a resin, or for forming a resin composition, a coating, a dispersion solution or a molded article containing the ultrafine metal particles.
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Page/Page column 11
(2010/11/19)
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- Phosphine-free synthesis of high quality ZnSe, ZnSe/ZnS, and Cu-, Mn-doped ZnSe nanocrystals
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High quality zinc blende ZnSe and ZnSe/ZnS core/shell nanocrystals have been synthesized by two converse injection methods (i.e. zinc precursor injection or selenium precursor injection) when Se-ODE complex was chosen as the phosphine-free selenium precur
- Shen, Huaibin,Wang, Hongzhe,Li, Xiaomin,Niu, Jin Zhong,Wang, Hua,Chen, Xia,Li, Lin Song
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p. 10534 - 10540
(2010/04/04)
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- Catalytic oxidative cleavage of terminal olefins by chromium(III) stearate
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A new synthetic methodology for the preparation of carbonyl compounds from the oxidative cleavage of terminal olefins has been developed. With the use of TBHP in combination with chromium(III) stearate, selective oxidation of double bonds conjugated with aromatic ring or carbonyl group could be achieved at ambient temperature in moderate to excellent yield. The oxidative cleavage of electron rich α-methylstyrene derivatives proceeded in good to excellent yield whereas lower yields were observed in α-methylstyrene derivatives containing an electron withdrawing group. This developed oxidation reaction was believed to undergo via free radical process and high valent chromium oxo species.
- Jarupinthusophon, Suekanya,Thong-In, Uthumporn,Chavasiri, Warinthorn
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p. 289 - 294
(2008/10/09)
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- Mechanistic investigation of the autooxidation of cumene catalyzed by transition metal salts supported on polymer
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The autooxidations of cumene to cumene hydroperoxide (CHP) in the presence of various transition metal salts supported on Bio-Rex 70 which is a macroreticular polyacrylate with carboxylate functional group, were investigated. The polymer supported catalyst is denoted as MS-BR-r in which MS represents transition metal salt, BR represents the polymer support and r is the loading of metal salt in the unit of mmoles per gram of dry support. In a catalyst loading of 0.20 g per 10 ml of cumene and initial O2 pressure 103 kPa at 363 K, the catalyzed autooxidation rate follows the order: Mn(OAc)2-BR-0.6 > Co(OAc)2-BR-0.6 > FeCl2-BR-0.6 > Cu(OAc)2-BR-0.6 > Cr(NO3)3-BR-0.6 >> Ni(OAc)2-BR-0.6. The selectivities to CHP are 97% for Cu(OAc)2-BR-0.6 and Cr(NO3)2-BR-0.6; and 92% for Mn(OAc)2-BR-0.6, Co(OAc)2-BR-0.6 and FeCl2-BR-0.6. These data indicate that Cu(OAc)2-BR-0.6 is the best catalysts among the catalysts investigated in this work. The metal loading effect was investigated for Co(OAc)2-BR-r, r = 0.3, 0.6, 1.5, 2.0 and 2.5. In the catalyst loading of 0.20 g per 10 ml of cumene and initial O2 pressure 100 kPa at 363 K, the oxidation rate increases with r from 3.96 X 10-5 M/s at r = 0.3 to 8.35 X 10-5 M/s for r = 2.5. The selectivity to CHP decreases with increasing r from 93.8% for r = 0.3 to 88.1% for r = 2.5 at a conversion of 7%. When cumene autooxidation catalyzed by Co(OAc)2-BR-2.0 was investigated at temperatures in the range of 363 K to 323 K, we found that oxidation rate decreases with temperature. However, unexpectedly, the selectivity decreases with temperature. This is interpreted by considering the competing reactions between the formation of CHP which has a high activation energy and the catalyzed redox decomposition of CHP which has a low activation energy. When temperature decreases, the rate of formation of CHP decreases more than that of the decomposition of CHP. When the autooxidation is catalyzed by a small amount of soluble copper(II) laurate or copper(II) stearate, the oxidation rate is faster and the selectivity to CHP is lower than that catalyzed by Cu(OAc)2-BR-0.6 under similar reaction conditions. The carboxylate coordination environment on copper(II) reaction center is not sufficient for Cu(OAc)2-BR-0.6 to be an effective catalyst in cumene autooxidation. We propose that the role played by the polymer support is that the backbone of the polymer reduces the rate of the catalyzed redox decomposition of CHP by hindering the change of the coordination environments on the copper center during the redox decomposition reaction of CHP.
- Hsu, Ying Fang,Cheng, Cheu Pyeng
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- Palatable solid pesticidal compositions of ethylene and vinyl acetate copolymer
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The invention comprises compositions in solid form of ethylene/vinyl acetate copolymer with an effective amount of bioactive agent, a protein/carbohydrate-lipid source, 0 to 20% of an edible oil and optionally an attractant, dye, preservative, adversive agent and biomarker and the use, thereof, to control pests.
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- SYNTHESIS OF Cu(II) AND Zn(II) AMINOCARBOXYLATES AND THEIR PROPERTIES.
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It was established by methods of chemical analysis, IR spectroscopy, and thermogravimetry that the reaction of Cu(II) and Zn(II) carboxylates of the corresponding monobasic aliphatic acids with gaseous ammonia in dimethylformamide leads to realization of coordination compounds of composition Cu(RCOO)//2 multiplied by (times) 2NH//3, Zn(CH//3COO)//2 multiplied by (times) 2NH//3.
- Prisyazhnyuk,Dzhambek
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