AICHE JOURNAL
·
2021
·Vol. 67
·期 10
·e17373
·
IF 3.993
Kaiqiang Shi,Xiaozhi Xu,Siyuan Dong,Biao Li,Jingbin Han
Inorganic–organic hybrid films containing two-dimensional nanosheets have shown good gas barrier performance, but moderate tensile property, because of the rigid characteristics of covalent or ionic bonds between the assembly units. In this work, we used LDH nanosheets rich in hydroxyl groups as building units, followed by modification of tannic acid (TA), to assemble with polyethylene oxide (PEO) through hydrogen bonds. Compared with previous work, the tensile property and oxygen barrier performance of (TA@LDH/PEO) n films have been significantly improved. A 50-bilayer TA@LDH/PEO film, deposited on a 1 mm thick natural rubber substrate, results in a 29× reduction (contrast with bare substrate) in oxygen transmission rate and maintains its good barrier property even under a large elongation of 120%. The excellent tensile and gas barrier properties are attributed to the ductility of hydrogen bond network among building blocks and the significant prolongation of oxygen transmission path induced by LDH nanosheets.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Jingjing Li,Xiaoguang Li,Xiaoying Zhang,Jingxian Zhang,Yusen Duan,Xingbang Li,Dongliang Jiang,Takahiro Kozawa,Makio Naito
Indoor gaseous pollutants pose a great threat to human health, graphene aerogel (GA) has attracted more and more attention due to its high adsorption performance. However, the increase of the adsorption capacity together with high strength for long time and repeat using is still a challenge. In this study, a novel silica modification method was proposed to modify graphene aerogels with high strength and ultrahigh adsorption capability. Apart from its high adsorption capacity for liquid toluene, the adsorption capability to benzene, an indoor pollutant gas, was increased to 809.51 mg/g, which is higher than pure graphene aerogel and other carbon-based adsorbents such as graphene, activated carbon and single-wall carbon nanotubes. The enhanced adsorption performance is due to two reasons in addition to the electrostatic interactions. On one hand, tetraethyl orthosilicate (TEOS) could help to modify the pore structure of aerogel, reducing its average pore diameter and increasing its BET specific surface area. On the other hand, the addition of TEOS could help to improve the hydrophobicity of aerogel. The selective adsorption character of graphene aerogels to benzene/toluene binary system in the breakthrough experiment confirmed that the prepared graphene aerogels could also be used in the field of separation of multicomponent indoor pollutant gases.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Zhanjia Kang,Dongzhi Zhang,Tingting Li,Xiaohua Liu,Xiaoshuang Song
This paper introduces a quartz crystal microbalance sensor (QCM) based on SnO 2 NFs/PDA composite with multi-layer stacked fiber nanostructure, which possesses high sensitivity and selectivity to formaldehyde gas. SnO 2 NFs/PDA composite was synthesized via electrospinning and further oxidative polymerization. The morphology and chemical compositions of the as-prepared composite nanomaterials were confirmed by a series of material characterization technologies. The QCM sensor based on SnO 2 NFs/PDA nanomaterials exhibited excellent sensing characteristics over a wide range of formaldehyde concentration (0.5 − 50 ppm), such as high sensitivity (12.2 Hz/ppm), short response/recovery times (25 s/38 s), high linearity and selectivity. The frequency shift characteristics and electrical parameters of the prepared sensors were confirmed by impedance analysis. The adsorption mechanism of formaldehyde gas could be attributed to hydrogen bonding and the combination of aldehyde ammonia Schiff base interactions. This work indicated that SnO 2 NFs/PDA based QCM possessed great potential in actual formaldehyde sensing, which provided a feasible solution for designing highly sensitive and selective formaldehyde sensor.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingni Yu,Jing Liu,Yingju Yang,Junyan Ding,Aijia Zhang
Iron oxide (Fe 2 O 3 ) has been used as an effective sorbent to remove various heavy metals due to its large adsorption capacity and low cost. The cadmium capture capability of Fe 2 O 3 sorbent was investigated in the simulated flue gas at the temperatures of 700–1100 °C. Fe 2 O 3 sorbent exhibited much better Cd adsorption capability than SiO 2 and Al 2 O 3 sorbents. The largest Cd adsorption capacity of Fe 2 O 3 sorbent was 86.7 mg/g at 700 °C. The XPS analysis demonstrated that Fe 3+ might partially participate in the cadmium adsorption process. A large quantity of CdO was generated and adsorbed on the Fe 2 O 3 surface. The density functional theory (DFT) calculations were used to determine the active sites and the involved mechanism of different cadmium species adsorption over Fe 2 O 3 sorbent. Cd, CdCl 2 , and CdO can be stably adsorbed on the Fe 2 O 3 surface with the adsorption energies of −40.64 kJ/mol, −237.42 kJ/mol, and −375.03 kJ/mol, respectively. The results illustrate that the Fe atoms are the essential active sites for cadmium species adsorption on Fe 2 O 3 surface. The orbital hybridization between cadmium atom and Fe site suggests that the strong interaction occurs during Cd adsorption process. Both physisorption and chemisorption mechanisms were responsible for the cadmium capture by Fe 2 O 3 sorbent.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jinyu Huang,Hao Liang,Jiexiong Ye,Dongting Jiang,Yiling Sun,Xuejin Li,Youfu Geng,Jiaqi Wang,Zhengfang Qian,Yu Du
Au-loaded ZnO were successfully prepared by means of seed-assisted solvothermal methods. The vertically ordered nanorod arrays are uniformly grown on the Al 2 O 3 substrate. The sensing properties of ZnO and Au-loaded ZnO sensors toward HCHO were investigated. Remarkably, the sensor based on 4 wt%Au-loaded ZnO nanorod arrays exhibits high response, short response and recover times, excellent selectivity, as well as low HCHO detection limit at 70 °C. After the incorporation of Au nanoparticle, the detection limit decreases from 10 ppm to 0.25 ppm, and the response increases more than 20 times under 100 ppm HCHO at 70 °C. Moreover, the mechanism of HCHO sensing with Au-loaded ZnO was explored by the calculations obtained from the first-principle studies.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Shuangping Xu,Wenqiang Ma,Hailiang Zhou,Yushu Zhang,Hongge Jia,Jingyu Xu,Pengfei Jiang,Xintian Wang,Wenwen Zhao
Hybrid membranes containing different loadings of butadiene-bridged polymethylsiloxane (BBPMS) in ethyl cellulose (EC) were prepared by an one-pot blending method from a non-isolated solution of polymethylhydrosiloxane (PMHS) reaction with butadiene, and a solution of EC in THF. The semi-crosslinked BBPMS and the BBPMS/EC hybrid membranes having good compatibility were characterized by Fourier transfer infrared (FTIR) and Scanning electron microscopy (SEM). The BBPMS/EC hybrid membranes exhibited good membrane forming ability, heat resistance and mechanical properties. It was worth mentioning that the BBPMS/EC blended membranes exhibit good selectivity for CO 2 /N 2 and O 2 /N 2 . Specifically, the blended membrane (BBPMS/EC-5:5) showed the highest ideal selectivities for CO 2 /N 2 and O 2 /N 2 were 25.5 (at a CO 2 permeability of 175 Barrer) and 4.85 (at a O 2 permeability of 33.2 Barrer), respectively. Compared to the pure EC membrane, the ideal CO 2 /N 4 selectivity and the ideal O 2 /N 2 selectivity of the blended membrane (BBPMS/EC-5:5) were increased by 41.8% and 53.0%, respectively. The modification strategy using semi-crosslinked polysiloxanes to enhance gas transfer of EC is promising for fabrication of high performance CO 2 and O 2 separation membranes.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Run Zhang,Jie Dang,Dong Liu,Zepeng Lv,Gangqiang Fan,Liwen Hu
The present study investigated the reduction and carbonization behavior of perovskite-geikielite by using CH 4 –H 2 gas mixture, which aimed to recycle the titanium resource in titanium-bearing blast furnace slag. Thermodynamic phase equilibrium analysis in the CaTiO 3 –CH 4 –H 2 , MgTiO 3 –CH 4 –H 2 and CaTiO 3 –MgTiO 3 –CH 4 –H 2 systems was performed by FactSage. The analysis indicated that CaTiO 3 could be ultimately reduced and carbonized to TiC x O y by CH 4 –H 2 gas mixture at temperature above 1300 °C, while the temperature for reduction of MgTiO 3 was above 1200 °C. MgTiO 3 is found to be reduced prior to CaTiO 3 in the CaTiO 3 –MgTiO 3 –CH 4 –H 2 systems. The reduction experiments of perovskite-geikielite were carried out in a temperature range of 1300 °C to 1450 °C in a flowing CH 4 –H 2 atmosphere. Experimental results showed that perovskite-geikielite could be reduced completely to TiC x O y at 1400 °C and above after 8 h reduction, while geikielite was reduced prior to perovskite. The reduction and carbonization extent of samples increased with increasing time and temperature when in a low temperature range (below 1400 °C). However, a much higher temperature (above 1400 °C) would hinder further carbonization of TiC x O y for the production of deposited carbon. Addition of iron oxides to sample strongly facilitated the reduction reaction, and even promoted the reduction of titanium to be completed at only 1300 °C after 8 h reduction. The gas-solid reaction provided a low temperature method to reduce and carbonize perovskite and geikielite, and thus it provided a possible way to use titanium-bearing blast furnace slag.
✓ 已验证
DOI
PubMed
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2019
·Vol. 34
·期 3
·e8576
·
IF 2.045
Jiaxiang Xu,Guohua Zhu,Huarong Zhang,Jinsong Liu,Kezhi Jiang
Rationale m -Cresol is listed as a priority controlled contaminant in many countries, but it is very difficult to accurately determine isomeric cresols due to their incomplete chromatographic separation on commercially available chromatographic columns and their nearly identical mass spectra. Methods Silylation of isomeric cresols was carried out by treatment with N -methyl- N -(trimethylsilyl)trifluoroacetamide. The formed trimethyl(tolyloxy)silanes were analyzed by gas chromatography/mass spectrometry (GC/MS). Theoretical calculations were carried out with the Gaussian 03 program using the density functional theory (DFT) method at the B3LYP/6-311 + G(2d,p) level. Results The derivatives of three isomeric cresols and six isomeric xylenols have been completely separated on an HP-5MS capillary column within a GC run of only 10 minutes. In addition, the derivative o -cresol can be very easily differentiated from its isomers due to its characteristic base peak ion at m / z 91 in electron ionization (EI)-MS. DFT calculation results indicated that the formation of the abundant fragment ion at m / z 91 is attributed to a facile dissociation pathway involving the shift of a neighboring phenylmethyl hydrogen atom in EI-MS of trimethyl( o -tolyloxy)silane. Conclusions Silylation provides a promising solution for simultaneous determination of isomeric cresols and isomeric xylenols.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 9
·5463-5468
·
IF 1.093
Zhang Nan,Liu Xinyang,Hou Ruirui,Zhang Jiangnan,Li Jia,Huo Pengchao,Xu Yue,Zhang Zhenzhong
The purpose of current research is to develop ultrasound-triggered gas-generating Doxorubicin PLGA nanoparticle for cancer therapy. Method: pH-sensitive PLGA nanoparticles (PLGANPs) was fabricated to deliver doxorubicin (DOX) and sodium bicarbonate (NaHCO3) using the water-in-oil-in-water
(w/o/w) double emulsion method. Result: The nanoparticle with the size (650 nm) and high drug loading (15.8±2.3%) were successfully prepared and showed pH-responsive release characteristics. In vitro results indicate that DOX/NaHCO3@PLGANPs with ultrasound had higher
inhibition and cell uptake on MCF-7 cells than free DOX and other formulation. In vivo animal experiments showed that after treatment of DOX/NaHCO3@PLGANPs with ultrasound, the relative tumor volume (0.63) of S180-tumor-bearing mice was lower than that of without ultrasound
(0.81), DOX@PLGANPs (1.00) and Free DOX (1.12). Moreover, safety evaluation result indicated that DOX/NaHCO3@PLGANPs was safer than free DOX. In conclusion, the DOX/NaHCO3@PLGANPs was successfully developed and evaluated In vitro and In vivo. This drug delivery
system will be a promising strategy for cancer therapy and diagnosis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Kelin Hu,Feipeng Wang,Hongcheng Liu,Yanqiong Li,Wen Zeng
Pd-doped SnO 2 nanofibres were prepared by electrospinning and magnetron sputtering . It was found that the efficiency of gas sensing properties in these fibres depends primarily on the density of oxygen vacancies , which can be regulated by plasma treatment. We demonstrated that moderate plasma treatment can increase the oxygen vacancy as well as improve the gas sensing performance of SnO 2. However, excessive plasma treatment led to the production of other substances that deteriorated the gas sensing performance. Furthermore, the best results for hydrogen gas sensing were obtained when the nanofibres were subjected to plasma treatment for 1 min. The fabricated material demonstrated a response of more than 53 for 500 ppm hydrogen at the optimum temperature (130 °C), which is a significant improvement as compared to sensors without plasma treatment. Evidently, plasma treatment is an effective method to further enhance the sensing properties of the fabricated nanofibres.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Fanfan Yan,Guowen Shen,Xi Yang,Tianjiao Qi,Jie Sun,Xinghua Li,Mingtao Zhang
Developing of novel chemiresistive gas sensing materials with desired unique gas chemisorption properties is of great important. In this work, motivated by the special electronic structure, Ag 3 PO 4 semiconductor is systematically investigated as gas sensing material for the first time. Encouragingly, the Ag 3 PO 4 nanoparticles based gas sensors exhibit high selectivity to NH 3 at near room temperature of 50 °C with negligible responses to the other gases (including H 2 , CO, ethanol, acetone, NO 2 and SO 2 ). Furthermore, the responses decreased with the increase of operating temperature from 50 to 100 °C, indicating the superior NH 3 sensing activity. The in-situ infrared characterization and theoretical calculations reveal that the lone pair of NH 3 coordinate with the superficial silver atoms of Ag 3 PO 4 accompanied with strong adsorption energy , efficient quantities electron migration and thermodynamic favorable, explained the origin of the high selectivity. Our work indicates that Ag 3 PO 4 based materials are very promising low operating temperature and highly selective NH 3 -sensing materials.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4757-4764
·
IF 3.069
Yunfan Yin,Qianghua Wu,Qingxian Liu,Longchao Du
The greenhouse gas carbon dioxide was converted to an oligomeric poly(propylene carbonate)-diol by a high activity salen–Co(III) catalyst. The new mussel biomimetic hydrogel was synthesized by the reaction of poly(propylene carbonate)-diol with 1,6-hexamethylene diisocyanate followed by lysine dopamine as a chain extender. DSC tests indicate that the hydrogel has two Tg peaks, and they gradually become compatible upon increasing the molecular weight of poly(propylene carbonate)-diol. The TGA curve shows that the hydrogel gradually degrades with the degradation of the dopamine side chain, the poly(propylene carbonate) backbone and the polyurethane backbone. UV-vis spectroscopy showed that when mixed with Fe3+, Fe3+ has different complex numbers with the hydrogel at different pH values, accompanied with color changes. Rheological tests show that the stronger the alkalinity, the greater the elastic modulus of the hydrogel. SEM confirmed the cross-linking structure of the hydrogel. The numerous catechol groups impart good cell affinity and bio-tissue adhesion to the hydrogel and promote tissue adhesion and integration. By using CO2, the biomimetic material can reduce greenhouse gas emissions, which will have broad application prospects.
✓ 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）