JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 6
·1-15
·
IF 2.02
Qin Xin,Shi Penghui,Liu Haolin,Fan Jinchen,Min Yulin,Xu Qunjie,Yao Weifeng
Metal nanoparticles have been combined with magnet metal–organic frameworks (MOFs) to afford new materials that demonstrate an efficient catalytic degradation, high stability, and excellent reusability in areas of catalysis because of their exceptionally high surface areas and structural diversity. Magnetic M
x
O
y
@N-C (M = Fe, Co, Mn) nanocrystals were formed on nitrogen-doped carbon surface by using 8-hydroxyquinoline as a C/N precursor. The Co@N-C, MnO@N-C, and Fe/Fe 2 O 3 @N-C catalysts were characterized by X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N 2 adsorption/desorption, and X-ray photoelectron spectroscopy (XPS). The catalytic performances of catalysts were thoroughly investigated in the oxidation of aniline solution based on sulfate radicals (SO 4
−. ) toward Fenton-like reaction. Magnetic M
x
O
y
@N-C exhibits an unexpectedly high catalytic activity in the degradation of aniline in water. A high magnetic M
x
O
y
@N-C catalytic activity was observed after the evaluation by aniline degradation in water. Aniline degradation was found to follow the first-order kinetics, and as a result, various metals significantly affected the structures and performances of the catalysts, and their catalytic activity followed the order of Co > Mn > Fe. The nanoparticles displayed good magnetic separation under the magnetic field.
ᅟ
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 46
·期 1
·363-369
·
IF 1.491
Wang Xuesong,Li Haiying,Ni Mucui,Wang Lianyuan,Liu Li,Wang Han,Guo Xuexin
The ruptured Nd-doped In 2 O 3 porous nanotubes have been successfully synthesized by single-capillary electrospinning method. The morphologies of the as-prepared materials were characterized by scanning electron microscopy and transmission electron microscopy. It can be seen obviously that the surface of the nanotubes are distributed with cracks and pores, which formed such an open nanostructure. The crystal structures and components were determined by x-ray diffraction, energy-dispersive x-ray spectroscopy and x-ray photoelectron spectrometer. The gas-sensing properties of ruptured Nd-doped In 2 O 3 porous nanotubes were studied and the results show the excellent performances of the as-obtained materials. The response of ruptured Nd-doped In 2 O 3 porous nanotubes to 100 ppm of formaldehyde is 46.8 at the optimum temperature of 240°C. The response and recovery times are 8 s and 22 s, respectively. Furthermore, the lowest detection limit of formaldehyde is 100 ppb with the value of 2.4. In addition, the ruptured Nd-doped In 2 O 3 porous nanotubes exhibit good selectivity to formaldehyde and long-term stability.
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2017
·Vol. 60
·期 12
·1878-1884
·
IF 1.719
Liu YanXiong,Liu Dong,Liu GuanNan
In the present study, Fe nanoparticles (NPs) can ignite when exposed to a conventional camera flash. The ignition process of Fe NPs was composed of the initial ignition stage with the maximum temperature level of 2000 K and the burning stage with temperature level of 800 K. The microstructure characterization indicated Fe NPs were oxidized to Fe 2 O 3 via the exposure-melt mechanism. It was found that more particle numbers per unit area can lead to lower minimum ignition energy which may be caused by the enhancement light energy absorption. The light energy absorbed from the flash was influenced by wavelengths but the conversion of Fe was only related to the packing mass.
✓ 已验证
DOI
高影响因子
Food Analytical Methods
·
2017
·Vol. 10
·期 12
·4094-4103
·
IF 2.038
Li Zhaoqian,Qi Mengyu,Tu Chunyan,Wang Weiping,Chen Jianrong,Wang Ai-Jun
We have developed an analytical method for the extraction and determination of enrofloxacin in milk sample by magnetic solid-phase extraction with metal-organic framework/graphene oxide (Fe 3 O 4 /MIL-100(Fe)/GO) as a sorbent coupling to spectrofluorimetry. The prepared Fe 3 O 4 /MIL-100(Fe)/GO nanocomposite were characterized by scanning electron microscopy, FT-IR spectroscopy, x-ray diffraction, and vibration sample magnetometer. The parameters affecting extraction efficiency including sample pH, amounts of sorbent, adsorption time, and acidity of elution solvent were optimized systematically. The optimal extraction conditions were as follows: 100.0-mL sample at pH of 8.0, 20.0 mg of Fe 3 O 4 /MIL-100(Fe)/GO as sorbent, extraction time of 30 min, and 4.00 mL of 15% ( v / v ) formic acid in methanol as eluent. A matrix-matched linear relationship (10.00–350.00 μg L −1 ) between the fluorescence intensity and the concentrations of enrofloxacin was obtained with correlation coefficient ( r ) = 0.9979. The limit of detection (S/ N = 3) and the limit of quantification (S/ N = 10) were 0.65 and 2.17 μg L −1 , respectively. The relative standard deviations of intraday and interday analysis ( n = 5) were 1.64 and 2.86%, respectively. The proposed method was successfully applied for the determination of enrofloxacin in milk sample with recoveries ranged from 85.7 to 106.3%.
✓ 已验证
产品关联
DOI
高影响因子
GLYCOCONJUGATE JOURNAL
·
2017
·Vol. 34
·期 5
·625-632
·
IF 2.186
Song Shuang,Yu Qi,Zhang Bao,Ai Chunqing,Sun Yujiao,Fu Yinghuan,Zhao Meiyu,Wen Chengrong
Fish intestines and livers are usually considered as delicious and nutritious food in China. Acidic polysaccharides are important nutrients in these food of animal origin, but there is currently little information regarding their quantitative distributions. The present study demonstrated a method to quantify acidic polysaccharides simultaneously by analyzing their disaccharides produced from the acid hydrolysis using high-performance liquid chromatography (HPLC) coupled with triple quadrupole mass spectrometry. The recoveries for these acidic polysaccharides were all 97%–115% with relative standard deviation of 3.0%–9.0%. All of the acidic polysaccharides had good linearities. Then this method was applied to determine the composition of acidic polysaccharides in 5 edible fish livers and intestines. Besides well-known glycosaminoglycans (GAGs) including hyaluronic acid (HA), Chondroitin sulfate (CS), dermatan sulfate (DS) and heparin (HP), 4 novel acidic polysaccharides including 2 GAGs and 2 non-GAGs comprised of hexose-hexuronic acid repeating units were also found. CS and HP were the major acidic polysaccharides components in fish intestines and livers, respectively. The absolute amounts of acidic polysaccharides differed greatly in these fish tissues, but their proportions showed similarity in the same type of tissues. The present study demonstrated an effective method for acidic polysaccharides quantification, and revealed acidic polysaccharides compositions of edible fish livers and intestines.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2017
·Vol. 295
·期 9
·1609-1619
·
IF 1.723
Ding Amin,Zhou Yifeng,Chen Pengpeng,Nie Wangyan
Amphiphilic star-shaped copolymers based on star-shaped poly(L-lactide) (s-PLLA) and poly(ethylene glycol) (PEG) (s-PLLA-PEG) were synthesized with variable molecular weights (M w ) of PEG, and the relationship between the PEG block molecular weight of s-PLLA-PEG copolymers and their micelle properties were investigated. The structure and M w of s-PLLA-PEG were characterized with 1 H NMR, GPC, DSC, and XRD. The ibuprofen (IBU)-loaded s-PLLA-PEG micelles were prepared by dialysis method. The effects of PEG block molecular weight on the morphology, particle size, zeta potential, drug loading content (LC), drug encapsulation efficiency (EE), and in vitro drug release behavior of prepared micelles were investigated. Results indicated that the average diameters, LC, and EE of IBU-loaded s-PLLA-PEG micelles increased with increasing the M w of PEG in s-PLLA-PEG copolymers. The in vitro study showed that the IBU accumulative release can be depressed by increasing the M w of the s-PLLA-PEG, and the release profiles of IBU from s-PLLA-PEG followed the Baker-Lonsdale model equation. The results suggest that structural tailoring of PEG length from s-PLLA-PEG copolymers could provide a new strategy for designing drug carriers of high efficiency.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Zhang Xueqin,Wang Huihui,Liu Chuanfu,Zhang Aiping,Ren Junli
Ring-opening graft polymerization (ROGP) of l -Lactide ( l -LA) is a practical method of altering the physical and chemical properties of lignocellulose. Previous studies have mainly investigated cellulose and tin-based catalysts, particularly of tin(II) 2-ethylhexanoate (Sn(oct) 2 ), at high temperatures and reported low graft efficiencies. In the present study, ROGP of l -LA was successfully achieved on xylan-type hemicelluloses in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an effective organic catalyst. Mild reaction condition (50 °C) was used to limit transesterification, and thus enhance the graft efficiency. The hydroxyl groups on xylan acted as initiators in the polymerization, and DBU, enhanced the nucleophilicity of the initiator and the propagating chain. Xylan- graft -poly( l -Lactide) (xylan- g -PLA) copolymer with a degree of substitution (DS) of 0.58 and a degree of polymerization (DP) of 5.51 was obtained. In addition, the structures of the xylan- g -PLA copolymers were characterized by GPC, FT-IR and NMR, confirming the success of the ROGP reaction. Thermal analysis revealed that the copolymers exhibited a single glass-transition temperature ( T
g ), which decreased with increasing molar substitution (MS). Thus, modification resulted in the graft copolymers with thermoplastic behavior and tunable T
g .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·613-620
·
IF 1.385
Fu Yuanyuan,Zhong Baoying,Chen Yaqin,Song Yonggui,Zhou Rihui,Song Yonghai,Chen Shouhui
A novel porous spherical ZnO@carbon (C) nanocomposite based on zeolitic imidazolate frameworks (ZIFs-8)-directed method was prepared for lithium-ion batteries (LIBs). In this strategy, spherical ZnO nanoparticles were firstly prepared, then 2-methylimidazolate and Zn 2+ were added alternately under ultrasound to fabricate ZnO@ZIF-8. Finally, the novel porous spherical ZnO@C nanocomposites were obtained via pyrolyzing the corresponding ZnO@ZIF-8. The novel porous spherical ZnO@C nanocomposites were characterized with different analysis techniques such as scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. The resulted spherical ZnO@C nanocomposites exhibited a high reversible capacity of 932 mA h g −1 at 0.1 A g −1 after 100 cycles, which is much higher than that of the pure ZnO nanoparticles. The porous structure, high specific surface area and good electrical conductivity eventually contribute to the good performance of the resulted ZnO@C nanocomposites for LIBs should be ascribed to the proous structure and high BET surface area derived from ZIFs, as well as the good electrical conductivity of the amourphous carbon derived from ZIFs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·
IF 2.101
Zhang Jing,Li Mengfei,Yuan Zhefan,Wu Dan,Chen Jia-da,Feng Jie
Abstract A novel type of stepwise-activable multifunctional peptide-guided prodrug micelles (MPPM) was fabricated for cancerous cells intracellular drug release. Deca-lysine sequence (K 10 ), a type of cell-penetrating peptide, was synthesized and terminated with azido-glycine. Then a new kind of molecule, alkyne modified doxorubicin (DOX) connecting through disulfide bond (DOX-SS-alkyne), was synthesized. After coupling via Cu-catalyzed azide–alkyne cycloaddition (CuAAC) click chemistry reaction, reduction-sensitive peptide-guided prodrug was obtained. Due to the amphiphilic property of the prodrug, it can assemble to form micelles. To prevent the nanocarriers from unspecific cellular uptake, the prodrug micelles were subsequently modified with 2,3-dimethyl maleic anhydride to obtain MPPM with a negatively charged outer shell. In vitro studies showed that MPPM could be shielded from cells under psychological environment. However, when arriving at mild acidic tumor site, the cell-penetrating capacity of MPPM would be activated by charge reversal of the micelles via hydrolysis of acid-labile β -carboxylic amides and regeneration of K 10 , which enabled efficient internalization of MPPM by tumor cells as well as following glutathione- and protease-induced drug release inside the cancerous cells. Furthermore, since the guide peptide sequences can be accurately designed and synthesized, it can be easily changed for various functions, such as targeting peptide, apoptotic peptide, even aptamers, only need to be terminated with azido-glycine. This method can be used as a template for reduction-sensitive peptide-guided prodrug for cancer therapy. Graphical abstract A novel type of stepwise-activable multifunctional peptide-guided prodrug micelles (MPPM) was fabricated for selective drug delivery in cancerous cells. MPPM could be shielded from cells under psychological environment. However, when arriving at mild acidic tumor site, the cell-penetrating capacity of MPPM would be activated by charge reversal of the prodrug micelles via hydrolysis of acid-labile β -carboxylic amides and regeneration of K 10 . The cell-penetrating peptide, K 10 , would enable efficient internalization of MPPM by tumor cells, and the drug would be rapidly released induced by concentrated glutathione and numerous proteases inside the cancerous cells, resulting in the inhibited effect of the cells .
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 24
·25056-25064
·
IF 2.76
Jia Yuyu,Kong Qian,Yang Zhaoguang,Wang Lin
Aquatic environment suffered from serious heavy metal and As pollutions due to rapid industrialization and urbanization in the last decades. In order to evaluate the heavy metal and As contamination in aquatic organism in southern China, the levels of As, Cd, Co, Cr, Cu, Fe, Mn, Pb, and Zn in muscle, gill, and liver of white bream ( Parabramis pekinensis ) collected from Xiang River were analyzed. The statistically significant differences of the analyzed element concentration (wet weight) between tissues were determined through one-way analysis of variance (ANOVA). The liver presented high affinity for accumulation of Cd, Cu, and Zn due to the binding activity of metallothionein proteins. Mn and Pb mainly accumulated in the gill indicated the major uptake route through the gill. Lack of correlation between analyzed element and fish size might imply no or weak biomagnification of the analyzed elements in fish tissues. The potential health risk associated with exposure to heavy metals and As was evaluated. The uncertainty of target hazard quotient was calculated by Monte Carlo simulation. The results indicated that the analyzed element contents in the white bream muscle posed relatively low-chronic toxic risk to consumers.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 8
·4719-4730
·
IF 1.369
Bao Lina,Wang Hong,Zhou Changqing,Cui Lu,Xin Baifu
The synthesis of high activity TiO 2 –CTAB–SiC composite possessing the microwave absorption capacity has been reported. Herein, the commercial Silicon carbide (SiC) particles were used as the microwave absorbent and supporter. TiO 2 nanopowders were loaded on the surface of SiC modified by hexadecyl trimethyl ammonium bromide (CTAB) via the hydrothermal route. The as-prepared TiO 2 –CTAB–SiC composite was characterized by X-ray diffraction, field-emission scanning electron microscopy, Fourier transformed infrared spectra, inductively coupled plasma-atomic emission spectrometry and fluorescence emission (PL). Its photocatalytic activity was evaluated by the degradation of rhodamine B in the microwave discharge electrodeless lamp (MDEL) system. The experimental results showed that TiO 2 –CTAB–SiC composite exhibited obviously higher photocatalytic activity in the MDEL system compared with pure TiO 2 nanopowders. Their reusability and separation performance were evaluated by recycling experiments. The reasons for the improvement in photocatalytic performance were discussed in detail.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 12
·3127-3133
·
IF 3.431
Guan Xiujuan,Cheng Ting,Wang Shuxia,Liu Xiaoyan,Zhang Haixia
Solid-phase microextraction with polysulfone and molecularly imprinted polymers as coating on nickel foam were used to adsorb and enrich floxacin drugs. The preparation method is simple and reproducible to obtain the materials with controlled thickness. After evaluation by scanning electron microscope and various adsorption experiments, the materials were used to adsorb analytes in water samples and biological samples. Coupling with chromatographic analysis, the method recoveries are satisfactory with 90.0–104.8% and 79.31–107.1% for water and biological samples. The method repeatability by intra- and interday experiments shows that the RSD values for water and biological samples were 1.0–9.9% and 1.7–10.3%, with the quantitative limits of three floxacin drugs as 3.0–6.2 μg L −1 .
Preparation diagram of polysulfone material
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）