THERMOCHIMICA ACTA
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2015
·
IF 2.184
Xiaolin Qiu,Lixin Lu,Ju Wang,Guoyi Tang,Guolin Song
Microencapsulation of n -octadecane or paraffin with poly(lauryl methacrylate) (PLMA) shell was performed by a suspension-like polymerization. The polymer shell was crosslinked by pentaerythritol tetraacrylate (PETRA). The surface morphologies of microcapsules were investigated by scanning electron microscopy (SEM). Phase change properties, thermal reliabilities and thermal stabilities of microcapsules were determined by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The n -octadecane microcapsule exhibits higher melting enthalpy (118.0 J g −1 ) and crystallization enthalpy (108.3 J g −1 ) compared with the paraffin microcapsule. The thermal resistant temperatures were enhanced by more than 25 °C when n -alkanes were microencapsulated by PLMA. The PCM contents of microcapsules decreased by less than 4 wt% and 6 wt% after 500 and 1000 thermal cycles, respectively. Heat-up experiments indicated that microcapsule-treated foams exhibited upgraded thermal regulation capacities. Consequently, microencapsulated n -octadecane or paraffin with PLMA as shell possesses good potentials for heat storage and thermal regulation.
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高影响因子
RSC Advances
·
2013
·Vol. 3
·期 44
·21863-21868
·
IF 2.562
Ningzhao Shang,Shutao Gao,Cheng Feng,Haiyan Zhang,Chun Wang,Zhi Wang
In this paper, an N-heterocyclic carbene–palladium complex (NHC-Pd2+) was immobilized onto the surface of graphene oxide via a chemical bonding method for the first time. The resultant graphene oxide supported NHC–Pd2+ composite (GO supported NHC-Pd2+) was characterized by transmission electron microscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy and infrared spectroscopy. It was demonstrated that the GO supported NHC-Pd2+ can act as an efficient catalyst for Suzuki–Miyaura coupling reactions. The yields of the products were in the range of 83% to 96%. The catalyst can be readily recovered and reused for at least 6 consecutive cycles without any significant loss in catalytic activity.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2013
·
IF 1.977
Qingqing Wang,Guoqing Zhan,Chunya Li
Using N -acetyl- l -cysteine (NAC) as a stabilizer, well water-dispersed, high-quality and stable CdHgSe quantum dots were facilely synthesized via a simple aqueous phase method. The as-prepared NAC capped CdHgSe quantum dots were thoroughly characterized by fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. A novel method for the selective determination of hemoglobin (Hb) was developed based on fluorescence quenching of the NAC capped CdHgSe quantum dots. A number of key factors including pH value of phosphate buffer solution, quantum dots concentration, the adding sequence of reagents and reaction time that influence the analytical performance of the NAC capped CdHgSe quantum dots in Hb determination were investigated. Under the optimal experimental conditions, the change of fluorescence intensity (Δ I ) was linearly proportional to the concentration of Hb in the range of 4.0 × 10 −9 –4.4 × 10 −7 mol L −1 with a detection limit of 2.0 × 10 −9 mol L −1 . The developed method has been successfully employed to determine Hb in human urine samples.
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PubMed
高影响因子
Energies
·
2015
·Vol. 8
·期 11
·13021-13032
·
IF 2.072
Pan Gao,Lu Xue,Qiang Lu,Changqing Dong
To study the effects of inherent and external alkali and alkaline earth metallic species (AAEMs,i.e., K, Ca and Mg) on the behavior of N-containing species release during rice straw (RS) pyrolysis, different pretreatments were applied in numerous experiments. Results indicate that ammonia (NH3) and hydrogen cyanide (HCN) are the major N-containing species and that the yields of isocyanic acid (HNCO) and nitric oxide (NO) are relatively low. The removal of inhert AAEMs shifts N-containing species release to a high-temperature zone according to volatile release behavior because of the increase in activation energy. The formation selectivity of NH3, HNCO, and NO increases by demineralized pretreatment, whereas HCN selectivity decreases. The formation of HNCO is mainly affected by alkaline earth metal. N-containing species release occurs in low temperatures with the addition of external AAEMs. The activation energy of samples impregnated with CaCl2and MgCl2sharply decreases compared to the original RS. The total yields of N-containing species are reduced significantly in the presence of KCl, CaCl2, and MgCl2as additives. The inhibition ability of AAEMs follows the sequence MgCl2> CaCl2> KCl. The inhibition effect of MgCl2can be improved by solution immersion compared with solid powder mixing. The clean biomass pyrolysis and gasification technology with low N-containing species content may be developed according to the results.Keywords:pyrolysis;N-containing species;alkali and alkaline earth metals (AAEMs);formation selectivity;relative yield
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Particuology
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2015
·
IF 2.11
Haifeng Jiang,Qianghui Xu,Chao Huang,Lin Shi
Nanofluids were prepared by dispersing Cu nanoparticles (∼20 nm) in n-tetradecane by a two-step method. The effective thermal conductivity was measured for various nanoparticle volume fractions (0.0001–0.02) and temperatures (306.22–452.66 K). The experimental data compares well with the Jang and Choi model. The thermal conductivity enhancement was lower above 391.06 K than for that between 306.22 and 360.77 K. The interfacial thermal resistance increased with increasing temperature. The effective thermal conductivity enhancement was greater than that obtained with a more viscous fluid as the base media at 452.66 K because of nanoconvection induced by nanoparticle Brownian motion at high temperature.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 57
·35687-35693
·
IF 3.108
Wenjie Gao,Yanhua Jiang,Zhihui Zhang,Yifang Zhang,Yanyan Liu,Yanhong Zhou,Xin Liu
Conventional protocols for cellular N-glycan profiling often need several time-consuming and labor-intensive steps, and a large amount of material (5–20 × 106 cells) is required. In this study, an optimized co-derivatization method was applied for convenient, rapid and highly-sensitive analysis of cellular N-glycan. Taking human cervical carcinoma cells (HeLa) as a model, the required amount for comprehensive cellular N-glycans analysis was reduced down to an original cell number of 105 and the total analysis time was decreased from several days to several hours. Good reproducibility of the method was also obtained with the CV averaging to less than 13.1%. In addition, compared to permethylation derivatization, more than 5-fold sensitivity improvement was achieved and more concise and clear mass spectra were obtained with the new developed method. As a preliminary study, this method was also successfully applied to reveal the difference in cellular N-glycan profiling of two heterogeneous live cell lines, human normal liver cells (L-02) and human hepatocyte carcinoma cells (HepG2), showing great potential for high-throughput analysis of N-glycans from limited cell samples, such as primary cell lines, cells obtained from cell sorting and small size cancer specimens.
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RSC Advances
·
2017
·Vol. 7
·期 22
·13325-13330
·
IF 3.108
Zhenlong Zhang,Junfeng Li,Xiaoli Wang,Jianqing Qin,Wenjia Shi,Yuefeng Liu,Huiping Gao,Yanli Mao
In this paper, Zr and N co-doped TiO2 (Zr/N–TiO2) nanorod arrays were synthesized using a hydrothermal method and perovskite solar cells were fabricated using them as an electron transfer layer. The solar cells based on Zr/N–TiO2 presented an enhanced performance compared with those based on un-doped TiO2. The solar cell performance was optimized by changing the Zr doping content. The efficiency of solar cells based on Zr/N–TiO2 with a Zr doping content of 1% (Zr/Ti, atomic ratio) has been achieved at 12.6%, which was 31.6% higher than that of solar cells based on un-doped TiO2. To get an insight into the enhancement, some investigations were carried out. The results indicate that the larger open voltage (Voc) could be due to the larger conduction band offset resulting from the smaller energy band gap for Zr/N–TiO2, and the enlarged short current (Isc) could be attributed to the faster electron transfer and reduced recombination rate for Zr/N–TiO2 NRs. These induce the enhancement of solar cell efficiency.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2015
·
IF 3.071
Wendi Liu,Tingting Chen,Tianshun Xie,Renhui Qiu
Soybean oil-based thermosets from acrylated epoxidized soybean oil (AESO) with a highly reactive vinyl monomer, N -vinyl-2-pyrrolidone (NVP), as crosslinking agent to replace styrene (St) were formulated for the fabrication of hemp fiber composites. The theoretical miscibility of NVP–AESO and St–AESO systems were discussed based on the group contribution method. The AESO resin with 30 wt% NVP exhibited a slightly higher viscosity than the counterpart with St, while the maximum curing temperature of the former was considerably lower than that of the latter. The composites from 20 wt% NVP resin gained comparable mechanical properties and higher glass transition temperature ( T g ) to the composites with 30 wt% St. Further increase in NVP usage to 40 wt% resulted in the composites with higher tensile strength , tensile modulus , flexural strength , flexural modulus, storage modulus, and T g of 29.6%, 22.4%, 22.5%, 20.6%, 21.6%, and 47.2%, respectively, when compared to those of the St-based composites.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2017
·
IF 3.255
Danyi Lu,Qian Xie,Baojian Wu
N -glucuronidation is an important pathway for metabolism and disposition of tertiary amines in humans. This reaction is mainly catalyzed by the enzymes UGT1A4 and UGT2B10. However, the metabolic patterns of UGT1A4- and UGT2B10-mediated N -glucuronidation are not fully clear. In this study, we first optimized in vitro reaction conditions for N -glucuronidation by using specific substrates (i.e., trifluoperazine for UGT1A4, cotinine and amitriptyline for UGT2B10). Furthermore, we found that hepatic N -glucuronidation showed significant species differences. In addition, UGT1A4 and UGT2B10 were primarily responsible for N -glucuronidation of many tertiary amines, including asenapine, loxapine, clozapine, chlorpromazine, dothiepin, doxepin, mirtazapine, mianserin, chlorcyclizine, cyclizine, promethazine, cyclobenzaprine, imatinib, retrorsine, strychnine and brucine. In conclusion, this study provides an in vitro assay system for evaluating N -glucuronidation of amines. Also, UGT1A4- and UGT2B10-mediated N -glucuronidation might play significant roles in metabolism and detoxification of tertiary amines in humans.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jinshe Chen,Zunbin Duan,Zhaoyang Song,Lijun Zhu,Yulu Zhou,Yuzhi Xiang,Daohong Xia
The amorphous NiP nanoparticles were synthesized and a novel amorphous NiP/Hβ catalyst was prepared successfully further. Due to the superior surface property of amorphous NiP/Hβ catalyst, it exhibited good catalytic application for n-hexane isomerization. The catalytic activity of amorphous NiP/Hβ catalyst was close to that of the prepared Pt/Hβ sample, and better than that of commercial catalyst and crystalline Ni 2 P/Hβ catalyst. What's more, the amorphous NiP/Hβ catalyst shows high resistance to different sulfur compounds and water on account of its unique surface property. The effect of loading amounts on surface property and catalytic performance was investigated, and the structure-function relationship among them was studied ulteriorly. The results demonstrate that loading amounts have effect on textural property and surface acid property, which further affect the catalytic performance. The 10 wt.% NiP/Hβ sample has appropriate pore structure and acid property with uniformly dispersed NiP nanoparticles on surface, which is helpful for providing suitable synergistic effect. The effects of reaction conditions on surface reactions and the mechanism for n-hexane isomerization were investigated further. Based on these results, the amorphous NiP/Hβ catalyst with superior surface property probably pavesa way to overcome the drawbacks of traditional noble metal catalyst, which shows good catalytic application prospects.
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高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Guoguang Wei,Alei Zhang,Kequan Chen,Pingkai Ouyang
This study presents an efficient pretreatment of crayfish shell using high pressure homogenization that enables N -acetyl- d -glucosamine (GlcNAc) production by chitinase. Firstly, the chitinase from Serratia proteamaculans NJ303 was screened for its ability to degrade crayfish shell and produce GlcNAc as the sole product. Secondly, high pressure homogenization, which caused the crayfish shell to adopt a fluffy netted structure that was characterized by Scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), was evaluated as the best pretreatment method. In addition, the optimal conditions of high pressure homogenization of crayfish shell were determined to be five cycles at a pressure of 400 bar, which achieved a yield of 3.9 g/L of GlcNAc from 25 g/L of crayfish shell in a batch enzymatic reaction over 1.5 h. The results showed high pressure homogenization might be an efficient method for direct utilization of crayfish shell for enzymatic production of GlcNAc.
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PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2017
·Vol. 20
·期 4
·873-880
·
IF 1.45
Zhao Mingwei,Wang Shilu,Dai Caili
Hydrophobic silica nanoparticles were prepared for pressure decreasing in water injection through modification of hydrophilic silica nanoparticles by n -propyltrichlorosilane. Fourier transform infrared spectroscopy analysis and surface hydroxyl number measurement results certified that the modification was very successful. The core flowing experiment showed that the modified hydrophobic silica nanoparticles have an excellent pressure-decreasing ability. The contact angles measurement results showed that the core chip changed from strong water wet to neutral wet after treated by the modified silica nanoparticles. In this work, a roughness decreasing mechanism is proposed to explain the pressure-decreasing mechanism of modified silica nanoparticles. After injection into the core, the modified silica nanoparticles occupied the spaces between the sand grains, forming a discontinuous hydrophobic film on the flowing channel surface. This can not only partially change the wettability of the sand surface, but also decrease the roughness of the core flowing channel, decreasing the critical layer thickness and flowing pressure accordingly.
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