CRYSTENGCOMM
·
2016
·Vol. 18
·期 39
·7614-7619
·
IF 3.849
Somboon Chaemchuem,Zhou Kui,Francis Verpoort
Lithium incorporation in metal–organic frameworks during solvothermal synthesis demonstrates a significant modification of the structure chemistry and surface properties of MOFs towards the adsorption selectivity of gas mixtures (CO2 and CH4) at ambient conditions. Variation of the lithium loading (xLi-MOF-5) led to tunability of the interpenetration resulting in materials with substantial differences in their properties. The behavior of xLi-MOF-5 was evaluated via phase identification based on XRD, functional group coordination using FTIR and adsorption measurements applying N2, CO2 and CH4 gas adsorption/desorption analysis. These efforts give rise to a new strategy to tailor MOFs for high efficiency CO2 adsorption and separation.
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Green Chemical Engineering
·
2022
·
IF 0
Shao-Min Wang,Qing-Yuan Yang
Natural gas processing involves the separation of higher hydrocarbons (C2–C3) from methane, which is an important and energy-intensive operation. In this paper, we present a comprehensive study of an innovative copper-based MOF (Cu-MOF) for the separation of propane and ethane from methane. The material exhibits a high adsorption capacity and selectivity for C2–C3 hydrocarbons over methane, which is primarily due to its preferential C2–C3 hydrocarbon adsorption. The adsorption isotherms at ambient conditions showed a remarkable uptake of C 3 H 8 of 134.0 cm 3 /g, as well as excellent selectivity of 204 and 9 for C 3 H 8 /CH 4 and C 2 H 6 /CH 4 . According to the theoretical calculations, differences in van der Waals interactions and polarizability of the guest molecules were responsible for influencing separation performance. In addition, we conducted adsorption kinetic experiments, dynamic breakthrough, and cycling experiments to further examine the separation performance. Overall, this research establishes an energy-efficient adsorbent for upgrading natural gas.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xing Sun,Ruo-Yun Zhang,Fang Zhang,Xiao-Lin Hou,Kai Cheng,Chao-Qing Li,Xiao-Ting Xie,Zi-Tao Zhong,Bin Zhang,Xiao-Quan Yang,Wei Chen,Bo Liu,Qiu-Ran Xu,Yuan-Di Zhao
Single treatment often faces the problem that it cannot completely eradicate tumor and inhibit the tumor metastasis. In order to overcome this shortcoming, multi-modal tumor treatment has attracted widespread attention. In the present article, based on ascorbyl palmitate (PA) and l -arginine ( l -Arg), a multifunctional nanocarrier is designed for synergetic treatment of tumor with photothermal and nitric oxide (NO) gas therapy . Firstly, PA and l -Arg were self-assembled to form novel functional micelles , PL, with high biosafety using electrostatic interaction and hydrogen bonding . The functional micelles could self-catalyze to produce NO at the tumor site. Then, Ag 2 S quantum dots having fluorescence imaging and photothermal properties were encapsulated to obtain the nanocarrier, A@PL. The results show that A@PL had a hydrated size of around 78 nm and presented good stability within 30 d. Moreover, in vitro studies indicate that it was efficient with regards to NO self-generating capacity, whereas the photothermal conversion efficiency was as high as 34% under near-infrared light irradiation . The cytotoxicity results show that, when the concentration of A@PL was as high as 2 mM, the survival rate of 3 T3 cells was still 78.23%, proving that the probe has good safety characteristics. Fluorescence imaging results show that its maximum enrichment can be achieved at the tumor site after tail vein injection for 3 h, and out of the body after 24 h, indicating good internal circulation. The in vivo studies show that the rate of inhibition of tumor using the nanocarrier was as high as 98%, and almost overcame the problem of tumor recurrence caused by single treatment, thus presenting a significant tumor treatment effect. This new multifunctional nanocarrier with self-catalytic production of NO provides a new idea for the efficient treatment of tumors.
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Analytical Methods
·
2019
·Vol. 11
·期 13
·1811-1815
·
IF 2.378
Shiwei Liu,Liang Liang,Qixian Zhang,Changpeng Liu,Wei Xing,Xiandui Dong
In this report, a reductive-heat-treated platinum tungsten oxide catalyst was prepared to improve the CO electro-oxidation activity and employed in the electrochemical sensor. Tungsten oxide was proved to be an effective co-catalyst for CO sensing and the strong interaction between platinum and tungsten oxide has been enhanced by the reductive heat treatment. As a result, the significant negative shift of CO oxidation potential was confirmed by an electrochemical characterization. Further, the sensing performance of the as-prepared catalyst was investigated by means of the portable CO sensor device, which showed higher sensitivity, faster response time and good linearity within 50 ppm CO.
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SOLID STATE IONICS
·
2020
·
IF 3.107
Ying Zhou,Tingting Zhou,Yipeng Zhang,Li Tang,Qing Guo,Mingfeng Wang,Changsheng Xie,Dawen Zeng
Core-shell heterostructures of metal oxide semiconductor (MOS) and metal organic framework (MOF) improve gas-sensing properties due to the MOF's molecular sieving effects. However, the selection of MOF is limited by the requirement of identical metal element in MOF to that in MOS, which is crucial for valid interface adhesion. In this paper, WO 3 @ZIF-71 (zeolitic imidazolate framework) structure with different metal elemental components (W and Zn) was fabricated by a step-by-step (SBS) approach. As a result, ZIF-71 was uniformly coated on the surface of WO 3 . In order to explore the influence of ZIF-71 (pore size: 4.8 Å), the gas sensitivity of WO 3 and WO 3 @ZIF-71 were tested. Different kinetic diameters gases: H 2 S (3.62 Å), CH 3 COCH 3 (4.6 Å), CH 3 CH 2 OH (4.53 Å), NO 2 (5.8 Å) were selected as testing gas. Gases with small molecules (H 2 S, CH 3 COCH 3 and CH 3 CH 2 OH) can pass through the membrane of ZIF-71 and contact with WO 3 , while larger ones (NO 2 ) were blocked outside the membrane. Excitingly, the response of WO 3 @ZIF-71 toward H 2 S gas was significantly improved, which soars from 2.24 of 20 ppm for pure WO 3 to 19.12 for H 2 S at 250 °C, increased about 9 times. These results indicate that the MOS@MOF core-shell structure can be synthesized by the SBS method without the restriction of the same metal elements in MOS and MOF, which is also an effective approach to regulate the selectivity and sensitivity of the MOS@MOF gas sensor.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Dong Fu,Xue Feng,Pan Zhang
Amino acid ionic liquids (AAILs) including 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium L -lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) were used to enhance the absorption of CO 2 in N -methyldiethanolamine (MDEA) aqueous solutions. The mole fractions of CO 2 in N 2 + CO 2 gas mixtures ranged from 0.2 to 1.0. The mass fractions of MDEA and AAILs respectively ranged from 0.300 to 0.400 and 0.050 to 0.100. The absorption capacity and absorption rate under series of conditions were presented and the influences of CO 2 partial pressure and the types of AAILs on the absorption performance were demonstrated.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 41
·e52994
·
IF 3.057
Jing Ni,Hongchao Niu,Shiqing Lai,Chanjuan Liu,Li Zhou,Lichun Wang,Xiaohua Huang
Through one-step copolymerization of 4-(4-[1-morpholinyl]phenyl)-2,6-bis(4-aminophenyl)pyridine (MPAP), 9,9-bis(4-aminophenyl)fluorene (BAFL), and (4,4′-hexafluoroisopropylidene)diphthalic anhydride (6FDA), a series of polyimides containing morpholine group, pyridine ring, fluorene “cardo” pendant and hexafluoroisopropyl group are obtained. The synthesized polyimides have good thermal stability, high transparency, outstanding hydrophobicity and excellent solubility in not only high-boiling solvents but also low boiling-point solvents. Furthermore, polyimide films have large molecular chain spacing, which is consistent with the free volume calculated by molecular simulation. Consequently, polyimide membranes display better gas permeability values of CO 2 (up to 24.47 Barrer) and He (up to 45.04 Barrer), and good ideal gas selectivity values of CO 2 /N 2 (up to 15.33 Barrer) and He/N 2 (up to 23.89 Barrer), which also shows potential application of polyimide matrix materials in gas separation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ziyu Qin,Chao Ouyang,Jian Zhang,Li Wan,Shimin Wang,Changsheng Xie,Dawen Zeng
Recently, Tungsten disulfide (WS 2 ) nanosheets are widely used for room-temperature NH 3 sensing. However, the lower sensitivity and the microstructural instability severely limit its potential application. Here, few- or mono-layer WS 2 nanosheets decorated with different amounts of TiO 2 quantum dots (QDs) were successfully prepared for room-temperature NH 3 sensing. The gas sensing studies revealed that the nanohybrids exhibited significantly enhanced sensitivity to NH 3 at room temperature. The response of nanohybrids with the optimal molar ratio to 250 ppm NH 3 is nearly 17 times higher than that of the pristine WS 2 . Especially, the TiO 2 QDs decorated WS 2 nanohybrids showed almost no decline in sensitivity after several testing cycles, indicating the long-term stability of the nanohybrids-based sensing materials. The sensing mechanism based on the largely enhanced sensitivity and the long-term stability of nanohybrids also discussed in detail. It was believed that the largely enhanced sensitivity was attributed to the effective electron transfer between the WS 2 and the TiO 2 QDs through S O Ti bonding, which was confirmed by XPS analysis. We hope that this work could help us to further understand the QDs sensitization mechanism and could provide a guideline to explore more transition metal dichalcogenides-based gas sensors with even higher sensing performances.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Feng Qiu,Yuguo Xia,Ting Wu,Shuying Li,Shicui Xing,Xiuling Jiao,Dairong Chen
In the last decade, three-dimensional nanofibrous porous materials (3D NPMs) have been attracting widespread interest ranging from thermal insulation to biological engineering. However, their practical application is always limited by the complex and high-cost fabrication process. Here, inspired by the mechanism of fermentation to produce cooked wheaten food, a general scalable strategy, namely, liquid film-assisted gas templating, is designed to fabricate anisotropic 3D NPMs from two-dimensional nanofibrous membranes (2D NFMs) without the tedious and time-consuming fabrication process. The successive production of gas promotes the bending of nanofiber layers and the increase of the gap between the adjacent layers, thereby forming numerous new interconnections, leading to cellular pore structures. Attributing to the maintenance of the continuous nature of the fibers and their layers, as well as the formation of new joints, the as-prepared 3D NPM exhibits anisotropic and superior mechanical properties. The high porosity and low density of the 3D NPM endow it with an outstanding thermal insulation performance, and the thermal conductivity can reach up to 0.045 W m–1 K–1. Additionally, the 3D NPM also shows potential applications in terms of oil adsorption, waterproofing, and gas permeability. Finally, the criteria for this process are given based on theoretical simulation and analysis, and the universality of this strategy has been confirmed through fabricating various 3D NPMs of inorganic, organic, and composite materials.
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NANO
·
2016
·
IF 0.951
Yong Zhang,Long-Zhen Xie,Chao-Xin Yuan,Chun-Lin Zhang,Su Liu,Ying-Quan Peng,Hai-Rong Li,Miao Zhang
In this study, rose-like nickel oxide nanoparticles (diameter of 400–500 nm) were prepared on indium tin oxide (ITO) glass substrates by a simple electrodeposition in NiSO 4 ⋅ 6H 2 O solution. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used for analysis of the NiO nanoparticles. The effects of operating temperature on the sensor response and the response versus gas concentration properties of the NiO nanorose-based sensors were investigated. We determined the operating temperature of the gas sensors to be 230 ∘ C, considering the proper sensitivity and a rapid response. In addition, gas-sensing characteristics of rose-like NiO nanoparticles to formaldehyde were investigated. It was shown that the sensors exhibited good response ( R g / R a = 3 . 4 3 ) properties to formaldehyde gas at 230 ∘ C, making them to be promising candidates for practical detectors to formaldehyde gas.
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JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 5
·2263-2270
·
IF 5.101
Qi Zheng,Yongheng Zhu,Jiaqiang Xu,Zhixuan Cheng,Huimin Li,Xinxin Li
Two new mesoporous SBA-15/organic hybrids featuring fluoroalcohol and fluorinated-phenol derivatives were successfully synthesized via a co-condensation route. Hexafluorobisphenol and hexafluoroisopropanol were chosen to graft onto mesostructured silica, respectively. The as-synthesized hybrids preserve their mesoscopic structures with relative large surface areas and pore volume, as confirmed by SAXS, TEM and N2 adsorption–desorption porosimetry. Moreover, FT-IR and solid-state MAS NMR spectroscopy proved covalent anchoring of the organic functional groups onto the SBA-15. In order to confirm the potential application of the hybrids in gas sensing, investigations on the sensing properties toward the nerve agent simulant dimethyl methylphosphonate (DMMP) were carried out by QCM transducer. The QCM sensors based on hybrid materials exhibit excellent sensitivity toward trace DMMP vapour down to 26 ppb. In comparison with pristine SBA-15, the hybrids also show remarkably enhanced selectivity to DMMP due to suitable H-bonding interactions. Therefore, the well-defined mesoscopic porosity of the organic–inorganic hybrids together with the grafted fluoroalcohol and fluorinated-phenol derivatives lead to excellent sensing properties to DMMP vapour, and show great potential in the area of nerve agent detection.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 24
·2000120
·
IF 4.886
Chun-Xia Zhang,Hong-Wei Li,Yuqing Wu
A novel strategy is reported for the synthesis of glutathione (GSH)-protected bimetallic nanoclusters, Au-AgNCs@GSH, and its fabrication with polyvinyl alcohol (PVA) into a film sensor for H 2 S gas detection. Meanwhile, carbon dots (CDs) synthesized from polyethyleneimine (PEI) are introduced as an internal standard to correct the photobleaching of Au-AgNCs@GSH and uniformity of film. The joining of it greatly improves the chemical and structural stability of the composite film via multi cross-linking between PEI, PVA, and GSH. The PVA-AuAgNCs-CDs film exhibits an emission-quenching response to H 2 S gas at atmosphere, which is highly repeatable, fast, sensitive, and can distinguish H 2 S from other poisonous gases. Finally, the in-depth mechanism investigations reveal that the quenching response is attributed to decomposition of Au-AgNCs@GSH and the formation of Au 2 S and Ag 2 S in the composite film. As a sensor, the PVA-supported film combines the functions of fluorescent metal nanoclusters and polymer CDs, providing a portable device for the rapid detection of H 2 S gas in air.
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