Surface Topography-Metrology and Properties
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2017
·Vol. 5
·期 4
·044001
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IF 0
Xiangyu Li,Yuwei Ye,Tong Liu,Wenru Zheng,Feng Yang,Haichao Zhao,Liping Wang
Novel quaternary ammonium cation containing tetraaniline (QATA) was successfully synthesized by condensation of amine-capped tetraaniline with 6-bromohexanoic acid, followed by quaternarization with triethylamine. The corrosion inhibition performance of QATA with their adsorption mechanisms for Q235 steel was studied in 1 M HCl solution by a series of methods such as weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM). The inhibition efficiency (IE%) increased with increasing concentrations of QATA, reaching a value up to 97.47% at a concentration of 150 mg l−1. Potentiodynamic polarization curves showed that the QATA affected both cathodic and anodic protection and was a mixed type inhibitor in 1 M HCl corrosive medium. Adsorption isotherm studies confirmed that the absorption of QATA on the Q235 steel surface in 1 M HCl solution obeyed Langmuir adsorption isotherm, and the adsorption process of corrosion inhibition on Q235 steel surface involved both the physical and chemical adsorption. The EDS analysis determined the adsorption of QATA molecules on the steel surface, the surface morphologies before and after immersion in 1 M HCl medium were also investigated by SEM and AFM.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Pengfei Wang,Hui Liu,Yuxing Xu,Yunfa Chen,Jun Yang,Qiangqiang Tan
Reducing the particle size is a straightforward way to increase the specific surface area of ruthenium oxide, which usually translates to the high specific capacitance for a supercapacitor. Herein, we report a facile strategy to fabricate ultrafine ruthenium oxides supported on various carbon-based substrates (carbon powders, carbon nanotubes, or reduced graphene oxides) as excellent electrode materials for a supercapacitor. The novelty of this work lies in its synthetic approach, which involves an aqueous synthesis of ruthenium nanoclusters under the control of pH value, and an air oxidation-based conversion process. In particular, owing to their ultrafine particle size, the as-prepared carbon-, carbon nanotube-, or reduced graphene oxide-supported ruthenium oxides exhibit specific capacitance as high as 879.1 F g −1 , 966.8 F g −1 and 1099.6 F g −1 , respectively, for a supercapacitor at a current density of 0.5 A g −1 . The specific capacitance maintains 98.4% (for carbon supports), 98.0% (for carbon nanotube supports) and 98.4% (for reduced graphene oxide supports) at current density of 1 A g −1 with good cycling stability. The remarkable simplicity and environmental friendliness of this synthesis may provide a liable quantity production route to produce ruthenium oxides as highly efficient electrode materials for a supercapacitor.
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高影响因子
BIOCHIMIE
·
2016
·
IF 3.017
Xiaoqiu He,Huayan Zhang,Yuhua Shi,Xin Gong,Shanshan Guan,He Yin,Lan Yang,Yongjiao Yu,Ziyu Kuai,Dongni Liu,Rui Hua,Song Wang,Yaming Shan
With increasing microbial drug resistance worldwide, antimicrobial peptides (AMPs) are considered promising alternatives to addressing this problem. In this study, a series of synthetic peptides were designed based on the membrane-disrupting properties of the membrane-proximal external region (MPER) of human immunodeficiency virus type 1 (HIV-1) envelope protein. The peptide AP16-A was found to exhibit the most effective antimicrobial activities against both Gram-negative and Gram-positive bacteria. The minimal bactericidal concentration (MBC) of AP16-A ranged from 2 μg/ml to 16 μg/ml. AP16-A had no detectable cytotoxicity in various tissue cultures and a mouse model. Furthermore, results of confocal fluorescence microscopy and the SYTOX Green uptake assay indicated that AP16-A killed Gram-negative bacteria by the combined effects of relatively slow membrane permeabilization and interaction with an intracellular target, while it killed Gram-positive bacteria by a fast membrane permeabilization process, which achieved relatively more rapid bacterial killing kinetics. The results of this study support the potential use of AP16-A as an AMP.
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PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2016
·
IF 1.78
Tianyang Wang,Haiya Sun,Ting Lu,Krithanthi C. Weerasinghe,Dongzhi Liu,Wenping Hu,Xueqin Zhou,Lichang Wang,Wei Li,Lizeng Liu
It is proved that introducing the ethyl substituted group to 1-amino will enhance the intramolecular charge transfer ( ICT ) process of 1-N substituted anthraquinone derivatives. Bathochromic shift of the absorption maxima and diminished absorption intensity are observed with the increase of the electron donation abilities of the N-ethyl groups. Moreover, the intramolecular and intermolecular hydrogen bonds further intensify the ICT properties through introducing the end amino group. This work exhibits more effective acceptors than anthraquinone in novel multichromophore materials for organic solar cells and other optoelectronic devices.
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高影响因子
NEW PHYTOLOGIST
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2016
·Vol. 211
·期 2
·658-670
·
IF 7.21
Jian Yang,Ming-Xing Gao,Han Hu,Xiao-Meng Ding,Hong-Wei Lin,Lei Wang,Ji-Ming Xu,Chuan-Zao Mao,Fang-Jie Zhao,Zhong-Chang Wu
Summary Arsenic (As) contamination in a paddy environment can cause phytotoxicity and elevated As accumulation in rice ( Oryza sativa ). The mechanism of As detoxification in rice is still poorly understood. We isolated an arsenate (As(V))-sensitive mutant of rice. Genomic resequencing and complementation identified OsCLT1 , encoding a CRT-like transporter, as the causal gene for the mutant phenotype. OsCLT1 is localized to the envelope membrane of plastids. The glutathione and γ-glutamylcysteine contents in roots of Osclt1 and RNA interference lines were decreased markedly compared with the wild-type (WT). The concentrations of phytochelatin PC 2 in Osclt1 roots were only 32% and 12% of that in WT after As(V) and As(III) treatments, respectively. OsCLT1 mutation resulted in lower As accumulation in roots but higher As accumulation in shoots when exposed to As(V). Under As(III) treatment, Osclt1 accumulated a lower As concentration in roots but similar As concentration in shoots to WT. Further analysis showed that the reduction of As(V) to As(III) was decreased in Osclt1 . Osclt1 was also hypersensitive to cadmium (Cd). These results indicate that OsCLT1 plays an important role in glutathione homeostasis, probably by mediating the export of γ-glutamylcysteine and glutathione from plastids to the cytoplasm, which in turn affects As and Cd detoxification in rice.
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PubMed
高影响因子
CATALYSIS TODAY
·
2017
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IF 4.636
Zhijie Wu,Min Zhang,Yirong Yao,Jingtuo Wang,Danhong Wang,Minghui Zhang,Yongfeng Li
1,3-propanediol (1,3-PDO) and γ-valerolactone (GVL) were simultaneously obtained via the hydrogenolysis of glycerol in levulinic acid (LA) using Ru/C catalysts. Ru/C catalyst exhibited a high LA conversion (∼99%) and a high GVL selectivity (∼99%) for the hydrogenation of LA; while a low conversion (∼11%) and little selectivity of 1,3-PDO for the hydrogenolysis of glycerol. LA promoted the hydrogenolysis of glycerol over Ru/C catalyst, in which LA catalyzed dehydration of glycerol into acetol (precursor of 1,2-propanediol (1,2-PDO)), and glycerol acetalization with the hydrogenated GVL into cyclic acetals, resulting in the formation of 1,3-PDO. A reaction scheme involves the formation of cyclic acetal ethers between GVL and glycerol was proposed to explain the product distributions in the one-pot synthesis of 1,3-PDO and GVL. 64.5% conversion of glycerol and 35.8% selectivity of 1,3-PDO together with 99.1% conversion of LA and 85.8% selectivity of GVL were obtained during one-pot converting glycerol and LA with 3.0 MPa H 2 at 200 °C for 6 h. We reported an effective strategy for the preparation of 1,3-PDO by selective hydrogenolysis of dioxan originated from glycerol with aldehydes or ketones.
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高影响因子
CARBOHYDRATE POLYMERS
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2016
·
IF 4.219
Panyu Li,Ting Li,Yu Zeng,Xiang Li,Xiaolong Jiang,Yabo Wang,Tonghui Xie,Yongkui Zhang
Herein, we report the production of xanthan gum by fermentation using kitchen waste as the sole substrate. The kitchen waste was firstly pretreated by a simple hydrolysis method, after which the obtained kitchen waste hydrolysate was diluted with an optimal ratio 1:2. In a 5-L fermentor, the maximum xanthan production, reducing sugar conversion and utilization rates reached 11.73 g/L, 67.07% and 94.82%, respectively. The kinetics of batch fermentation was also investigated. FT-IR and XRD characterizations confirmed the fermentation product as xanthan gum. TGA analyses showed that the thermal stability of the xanthan gum obtained in this study was similar to commercial sample. The molecular weights of xanthan gum were measured to be 0.69–1.37 × 10 6 g/mol. The maximum pyruvate and acetyl contents in xanthan gum were 6.11% and 2.49%, respectively. This study provides a cost-effective solution for the reusing of kitchen waste and a possible low-cost approach for xanthan production.
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PubMed
高影响因子
International Journal of Nanomedicine
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2017
·
IF 4.3
Fei Tong,Suhuan Liu,Bing Yan,Xuejun Li,Shiwei Ruan,Shuyu Yang
The purpose of the study was to reveal the therapeutic effect of quercetin (QUE) nanoparticle complex on diabetic nephropathy (DN) by regulating the expression of intercellular adhesion molecular-1 (ICAM-1) on endothelium as compared to free QUE. QUE 10 mg/kg as a single abdominal subcutaneous injection daily for 8 weeks continuously in diabetic rats and 10 mg/kg QUE nanoparticle complex as a single abdominal subcutaneous injection every 5 days, continuously administered for 8 weeks to diabetic rats. Blood and left kidneys were collected; pathological change of kidney, renal function, oxidative stress level, blood glucose level, serum lipid, urine protein, and albumin/creatinine ratio were measured; and neutrophil adhesion, ICAM-1 expression, and CD11b+ cells infiltration were observed. Both QUE and QUE nanoparticle complex preconditioning ameliorated the pathological damage of kidney and improved renal function, alleviated renal oxidative stress injury, restricted inflammatory cells infiltration, and downregulated the ICAM-1 expression as compared to DN group, while QUE nanoparticle complex significantly alleviated this effect.
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高影响因子
Pharmacological Reports
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2017
·
IF 2.587
Ting Wu,Haixin Li,Jiasheng Chen,Ying Cao,Weimin Fu,Pingzheng Zhou,Jianxin Pang
Background Apigenin is a flavonoid compound, widely distributed in natural plants. Various studies have suggested that apigenin has inhibitory effects towards several drug transporters, such as the organic anion transporting (OAT) polypeptides , 1B1 and 1B3 (OATP1B1 and OATP1B3). However, the mechanism by which apigenin interacts with OAT1 has not been well studied. Methods MDCK cells stably-expressing OAT1 were used to examine the inhibitory effects of apigenin on OAT1. UPLC–MS/MS was used to evaluate the in vitro and in vivo effects of apigenin on the uptake of acyclovir by OAT1. Cytotoxicity was determined by the cell viability , MTT assays . Results Apigenin effectively inhibited the activity of OAT1 in a dose-dependent manner with an IC50 value of 0.737 μM. Pre-incubation of cells with apigenin caused a time-dependent inhibition (TDI) of OAT1. Additionally, we examined the interactions between apigenin and acyclovir or adefovir . Data showed that apigenin (1 μM) significantly blocked the uptake of acyclovir by OAT1 in vitro with an inhibition rate of 55%. In vivo , apigenin could increase the concentration of acyclovir in plasma when co-administered with acyclovir. Importantly, the MTT assays showed that, at a dose of 50 μM, apigenin significantly reduced the cytotoxicity of adefovir and substantially increased cell viability from 50.6% to 112.62%. Conclusion Our results demonstrate that apigenin regulates OAT1, and can cause TDI or herb-drug interaction (HDI) when used in combination with acyclovir or adefovir. Therefore, apigenin could be used as a nephroprotective agent when used in combination with the substrates of OAT1.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2016
·
IF 2.628
Meixia Zhao,Xianyong Wei,Zhimin Zong
A new solid acid was prepared by trifluoromethanesulfonic acid (TFMSA) impregnation into an acid-treated attapulgite (ATA). Di(1-naphthyl)methane (DNM) hydrocracking was used as the probe reaction to evaluate the catalytic performance of TFMSA/ATA for cleaving C ar –C alk bridged bonds in coals. The results show that DNM was specifically hydrocracked to naphthalene and 1-methylnaphthalene over TFMSA/ATA in methanol in the absence of gaseous hydrogen. In particular, TFMSA/ATA was demonstrated to be stable after four cycles with slight loss in catalytic activity. Furthermore, a proposed H + transfer mechanism successfully interprets the TFMSA/ATA-catalyzed hydrocracking reaction of DNM.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Yuanhang Song,Tao Wang,Jingxian Zhang,Yanhui Li,Junru Li,Chuanwei Zhang,Pengfei Zhang
This study explores the ion transport properties of self-microporous polymers by introducing a novel combination of carboxylated PIM-1 with sulfonated graphene oxide (SGO) to fabricate membranes. The resulting membranes exhibit enhanced structural stability, hydrophilicity, and ion exchange capacity (IEC) compared with the original carboxylated PIM-1 (CPIM-1), while preserving the subnanoporous structure. However, it was observed that excessive SGO loading leads to a detrimental “blocking effect” that compromises various membrane properties. Through electrically driven ion transport tests in a 0.01 M NaCl solution, it is demonstrated that a moderate amount of SGO effectively enhances membrane conductivity from 46.96 μS m −1 (for carboxylated PIM-1 membranes without SGO) to 56.55 μS m −1 . Additionally, the membranes exhibit selective sieving of cations and anions. The presence of small-sized ion channels and the electrostatic repulsion generated by the abundant carboxyl and sulfonic acid groups significantly hinder Cl − transport. Consequently, the Na + /Cl − migration ratio (t + /t − ) reaches 98 at a concentration ratio of 10:1 on both sides of the membrane, surpassing the value of 3.74 observed for the pure CPIM-1 membrane. This investigation provides valuable insights for the practical application of easily prepared, processable, and cost-effective hydrophilic self-contained microporous polymer membranes in ion transport applications.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rongrong Hu,Wenfang Peng,Lin Cheng,Qiaoyun Wu,Gaolei Dong,Pan Liang,Bobo Yang,Yuefeng Li,Jun Zou,Donghai Feng
Metal halide perovskite nanocrystals (NCs) are emerging for emitting applications due to their high photoluminescence (PL) quantum yield and wide PL wavelength tunability. Here, the light-induced PL enhancement in complexes of CsPbBr3 NCs and 1-octanethiol (OT) molecules (refers to below as NC–OT complexes) is investigated. In comparison with that of as-grown CsPbBr3 NCs, the PL intensity of NC–OT complexes is lower before light illumination. While after ultraviolet light illumination, the PL performance of NC–OT complexes is improved in both air and nitrogen atmospheres. Compared with air atmospheres, anaerobic atmospheres are more effective at increasing the PL intensity because of eliminating photo-oxidation. The light illumination prevents the nonradiative process and enhances the radiative emission in NC–OT complexes, supported by transient PL and photobleaching measurements, due to better surface passivation through thiol–ene reactions. The light-induced PL enhancement in NC–OT complexes provides valuable information for the applications of perovskite nanomaterial-based emitting devices.
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