JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 43
·
IF 1.768
Xiaoqin Chen,Zuliang Liu,Weiwei Cao,Chunyan Yong,Xiaodong Xing
A viable method for coating of cellulose fiber with quaternarized N-halamine is reported in this article. The use of quaternary ammonium salt group in combination with N-halamine group can reinforce the antibacterial activity. The chemical structure of as-synthesized N-halamine precursor 4-(Bromo-acetic acid methylester)-4-ethyl-2- oxazolidinone (BEO) was characterized by 1 H-NMR. The cellulose fibers were characterized by Fourier transform infrared spectra and X-ray photoelectron spectra. The spectra data confirmed that the quaternarized N-halamine-grafted cellulose fibers were successfully obtained. The antibacterial properties of functional fibers were challenged with both Gram positive and Gram negative bacteria. The antibacterial tests and showed that the as-prepared antibacterial cellulose fibers exhibited powerful and rapid bactericidal performance against both Gram negative E. coli and Gram positive S. aureus . © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42702.
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2014
·
IF 0
Qingzhao Shi,Lishuai Jing,Weihong Qiao
Poor solubility of heavy hydrocarbons in CO 2 has limited the application of CO 2 -EOR (enhanced oil recovery) in modern oil recovery industry to some extent. Therefore, it is crucial to investigate the solubility regularity of different hydrocarbons in supercritical carbon dioxide (scCO 2 ) in the first place. In this paper, our objective is to explore the solubility of n -alkanes (C 6 H 14 –C 18 H 38 ) in scCO 2 . To measure cloud point pressures, the experiment utilizes high-pressure view chamber, and results for accuracy and repeatability of the experimental method and instrument are evidently positive. Then, cloud point pressures for n -alkanes from 318 K to 343 K show a proximately linear and positive correlation with the temperature; they also increase with expanding chain length of n -alkanes. In addition, the result of x (molar fraction of n -alkane at cloud point pressure) indicates that x has a positive correlation with the pressure at identical temperature, and when pressure is constant, temperature increase will reduce x . Finally, relationship studies between density of CO 2 and x reveal that, density of CO 2 has a positive influence on the solubility of n -alkane, and the Chrastil model corrects ln ρ and ln S data. The measured data align with the Chrastil model, with a maximum AARD value of 9.85%.
✓ 已验证
产品关联
DOI
Light-Science & Applications
·
2015
·Vol. 4
·期 12
·e364
·
IF 14.603
Qu Dan,Zheng Min,Li Jing,Xie Zhigang,Sun Zaicheng
Unlike inorganic quantum dots, fluorescent graphene quantum dots (GQDs) display excitation-dependent multiple color emission. In this study, we report N-doped GQDs (N-GQDs) with tailored single color emission by tuning π -conjugation degree, which is comparable to the inorganic quantum dot. Starting from citric acid and diethylenetriamine, as prepared N-GQDs display blue, green, and yellow light emission by changing the reaction solvent from water, dimethylformamide (DMF), and solvent free. The X-ray photoelectron spectroscopy, ultraviolet-visible spectra results clearly show the N-GQDs with blue emission (N-GQDs-B) have relatively short effective conjugation length and more carboxyl group because H 2 O is a polar protic solvent, which tends to donate proton to the reagent to depress the H 2 O elimination reaction. On the other hand, the polar aprotic solvent (DMF) cannot donate hydrogen, the elimination of H 2 O is promoted and more nitrogen units enter GQD framework. With the increase of effective π -conjugation length and N content, the emission band of N-GQDS red-shifts to green and yellow. We also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Keyi Wu,Yonghong Hu,Wenge Yang,Tuan Zhang,Qirun Guo,Shouhai Yang,Ying Shi
The solubility of N-Ethylcarbazole in methanol, ethanol, n-propanol, isopropanol, 1-butanol, 1-pentanol and petroleum ether was measured over the temperature range of 279.15–319.15 K at around 4 K intervals under atmospheric pressure. Experimental result showed that the solubility of N-Ethylcarbazole in seven solvents increased with the increasing temperature and they were in good agreement with the calculated solubility of the modified Apelblat equation and the λh equation. The thermodynamic properties of the solution process, including the Gibbs energy , enthalpy, and entropy were calculated by the van’t Hoff analysis. The values of both the standard molar enthalpy change and standard molar Gibbs energy change of solution were positive, which indicated that the process was endothermic.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Xiufang Yan,Zhiqiang Jie,Lianhong Zhao,Hong Yang,Shiping Yang,Jie Liang
Novel polymeric micro/nano particles (MNPs) containing amide functional groups, poly (styrene-co-N-(t-Bu)-acrylamide) (PSA-NH) MNPs, have been synthesized by a copolymerization of styrene and acrylic acid and then an amination with tert-butylamine. The as-synthesized PSA-NH MNPs were converted to antibacterial polymeric MNPs containing N-halamine groups, poly (styrene-co-N-(t-Bu)-N-chlorine-acryl amide) (PSA-N-Cl) MNPs, by a facile chlorination in diluted NaOCl solution. The as-prepared PSA-N-Cl MNPs were characterized by field emission scanning electron microscopy (FE-SEM), Brunauer–Emmet–Teller (BET) analysis, X-ray photoelectron spectra (XPS), and Fourier Transform infrared spectroscopy (FTIR). Antibacterial tests showed that the as-prepared PSA-N-Cl MNPs possess powerful antibacterial activity against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Minimum inhibitory concentration (MIC) values of PSA-N-Cl MNPs against E. coli and S. aureus were 0.20 μg/mL, whereas minimum bactericidal concentration (MBC) values of them against E. coli and S. aureus were 5.00 and 7.00 μg/mL, respectively. The storage stability test indicated that PSA-N-Cl MNPs are very stable under common storage conditions.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 36
·22071-22078
·
IF 3.108
Cejun Hu,Guoxin Zhang,Haoyuan Li,Cong Zhang,Yingna Chang,Zheng Chang,Xiaoming Sun
Compositing graphene oxide (GO) with controllable secondary components is of great significance to achieve carbon materials with high-level physicochemical properties. In this study, thin sandwich composites of GO and N-doped carbon (GO@NdC) were fabricated through controllable deposition of polyvinyl dichloride (PVDC)-dehalogenated carbon on GO; this method exploited the high affinity between PVDC and GO. The thin deposited carbon layers on GO achieved the thicknesses ranging from 1.0 to 2.0 nm. Considering that dehalogenated carbon has been verified to be highly reactive for coupling heteroelements, an overall N content of ∼7.0 at% was obtained with the addition of melamine as a N source. Moreover, the byproducts EtOH and NaCl could tune the composites into open 3D structures in situ, efficiently preventing the thin-layered composites from re-stacking. After activation with KOH, GO@NdC further demonstrated a hierarchical pore structure and large specific surface area. Remarkably, KOH-activated GO@NdC exhibited a high specific capacitance of ∼354 F g−1 and a capacitance retention of >65% (at 10.0 A g−1). Finally, the GO@NdC symmetric supercapacitor also achieved a high specific energy of ∼11.8 W h kg−1 in an aqueous alkaline electrolyte.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Jirui Yang,Feng Shen,Mo Qiu,Xinhua Qi
This paper reports a nonreductive dechlorination pathway (dehydrochlorination) of lindane in the presence of N -MWCNTs (CNT-N1 and CNT N2) under environmentally relevant conditions. The enhanced catalytic dehydrochlorination at mild pH values (7.0–9.0) was mainly attributed to the Lewis base nature of nitrogen functional groups on the surface of N -MWCNTs, based on FT-IR spectra, X-ray photoelectron spectroscopy and CO 2 -TPD profile. Amine and pyridinic nitrogen species were inferred as the main basic sites that were responsible for the dehydrochlorination of lindane. The concentration of lindane was unchanged in homogenous alkaline aqueous solutions at pH 7.0 and 8.0 within 6 d, and up to 89.5% of lindane remained at pH 9.0. In sharp contrast, the reaction rate constant ( k obs ) increased from 0.024 to 0.876 d − 1 with the increasing pH from 7.0 to 9.0 when CNT-N2 catalyst was used. All lindane was transformed in the presence of CNT-N2 at pH 9.0, leading to a much greater k obs as compared to that obtained in homogenous solution (0.876 vs 0.019 d − 1 ). Even at neutral pH condition, the k obs obtained in the presence of CNT-N2 was higher than that observed in weakly alkaline solution (0.024 d − 1 at pH 7.0 vs 0.019 d − 1 at pH 9.0). γ-1,3,4,5,6-pentachlorocyclohexene and trichlorobenzene isomers were detected as the intermediate and final products, respectively. It might be inferred that amine and pyridinic nitrogen species could attack the hydrogen atom attached to the β‑carbon, and the dehydrochlorination of lindane followed a β-elimination mechanism. This study provides an alternative dechlorination way for making lindane less toxic and better biodegradable under mild conditions, which is beneficial for complete mineralization of lindane when coupled with microbial degradation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2016
·
IF 2.624
Jian Qin Zhou,Ting He,Jian Wen Wang
Microbial transglutaminase (mTG) is widely utilized in the PEGylation of pharmaceutical proteins. mTG immobilization can be achieved via covalent bonding on solid supports. However, the catalytic efficiency of mTG immobilized on solid supports was significantly reduced by mass transfer limitation. To overcome this limitation, mTG was covalently immobilized on the thermo-responsive carboxylated poly( N -isopropylacrylamide) (pNIPAM). The pNIPAM-mTG conjugate exhibited reversibly solubility in aqueous solution with a low critical solution temperature (LCST) at 39 °C, i.e., it was insoluble above 39 °C and soluble below 39 °C. The pH dependence of the pNIPAM-mTG conjugate was similar with that of the native mTG. Upon conjugation to pNIPAM, the optimal temperature of mTG shifted down from 50–55 °C to 40–45 °C, and the thermal stability of the conjugate was elevated. The easy separation of the pNIPAM-mTG conjugate with its substrate and the catalytic efficiency of the pNIPAM-mTG conjugate were demonstrated by employing the pNIPAM-mTG conjugate to cross-link bovine serum albumin (BSA) and catalyze PEGylation of therapeutic protein, cytochrome c (Cyt C), respectively. The thermo-responsive mTG is suitable to modify proteins in food processing and biomedical engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 3
·2282-2290
·
IF 2.019
Zhao Gao-yu,Yang Shao-wei,Jiang Lin,Zhang Hong-mei
Novel Ag 10 Si 4 O 13 /N–CeO 2 composite photocatalysts were synthesized by a facile one-pot method. XRD, SEM, EDS, and UV–Vis DRS were employed to characterize the structures of the samples. Moreover, the degradation activity of methyl violet (MV) was used to measure the photocatalytic performances of Ag 10 Si 4 O 13 , N–CeO 2 , and the Ag 10 Si 4 O 13 /N–CeO 2 composites. It was found that ASO-10 (the Ag 10 Si 4 O 13 /N–CeO 2 composite with 10 mg N–CeO 2 ) showed the highest photocatalytic activity in the degradation of MV, and the enhanced photocatalytic performance is attributed to an improvement in the separation efficiency of photoproduced electron–hole pairs. Effects of operational parameters, such as initial pH, catalyst dosage, initial dye concentration, anions and cations, have also been considered for better practical applications. In addition, the photocatalytic mechanism of the Ag 10 Si 4 O 13 /N–CeO 2 composites is also proposed.
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2017
·Vol. 60
·期 9
·1191-1196
·
IF 4.132
Ji Shaobo,El Mard Hicham,Smet Mario,Dehaen Wim,Xu Huaping
Macrocycles possess potential applications in supramolecular chemistry and biosystems. Thus development of new kinds of macrocycles is of significance. Herein, novel macrocycles containing Se–Se/Se–S bonds were synthesized via transformation between selenium related dynamic covalent bonds. A monomer containing two ebselen moieties was synthesized ( M1 ). The Se–N bonds in M1 were reduced by dithiothreitol, forming Se–S linked dimer ( D1 ). To realize the transformation from Se–S bonds to Se–Se bonds, guest molecules were added as template, triggering the formation of Se–Se linked dimer ( D2 ). The formation of these two new kinds of macrocycles was determined by 1 H NMR and 77 Se NMR, and the necessity of guest molecules was also confirmed. The introduction of ebselen moieties and Se–S bonds or Se–Se bonds into macrocycles may endow it with new responsiveness and bioactivities, as well as new types of host-guest chemistry.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·A3303
·
IF 3.259
Qianqing Zhao,Mingqi Li
To develop high-capacity and low-cost carbon material, a novel high-content N, O-codoped C anode material is synthesized using melamine and glucose as starting materials. The as-prepared sample is composed of hierarchical meso-macroporous carbon bulks and graphene-like carbon sheets with 23.5 wt% N and 13.8 wt% O. The high-content N, O-codoped C exhibits high lithium storage capacity, long cycle life and excellent rate capability. At 200 mA g−1 over a voltage window of 0–3.0 V at 25°C, a discharge of about 670 mAh g−1 can be obtained after 500 cycles. Even at 1600 mA g−1, the high-content N, O-codoped C still exhibits a stable discharge capacity of 330 mAh g−1. Compared with the O-doped C and non-doped C materials, the high-content N, O-codoped C shows significant advantages in lithium storage performance, which are attributed to its high surface area, abundant porosity, graphene-like structure and rich heteroatom doping. With the rise of temperature, the lithium storage capacity of the high-content N, O-codoped C increases. With the decrease of delithation cutoff voltage, the reversible capacity of the high-content N, O-codoped C decreases. When assembled a full cell with the LiNi0.5Co0.2Mn0.3O2 cathode, a relatively stable cycling performance can be obtained.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Zhihong Tian,Jiajia Huang,Xin Zhang,Gonglei Shao,Qiuyun He,Shaokui Cao,Siguo Yuan
High adsorption capacity and selectivity of microprous carbon are critical for exceptional post-combustion CO 2 capture ability. Herein we report a novel strategy to prepare N-doped microprous carbon with high surface area (2363 m 2 g −1 for CPTHB-7), narrow pore size distribution and high ultramicropore ratio (<0.7 nm, 68% for CPTHB-6) via a simple chemical activation of a rigid polymer porous framework (PTHB) synthesized via polycondensation reaction of 1,3,5-THB and aniline. The as-prepared microprous carbon exhibit high CO 2 adsorption capacities of 5.6–6.3 mmol g −1 (273 K and 1 bar) and sufficient CO 2 /N 2 selectivity of 12–22 for a 0.15/0.85 CO 2 /N 2 mixture at 298 K and 1 bar (conditions of CO 2 capture application). The effect of microporosity and N content for our materials on the CO 2 adsorption performance had also been investigated. Microporous volume below critical size contributed to the adsorption capacity for CO 2 , while the N content and nitrogen species play a role in the CO 2 /N 2 selectivity.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）