Small
·
2022
·Vol. 18
·期 16
·2105129
·
IF 15.153
Songlong Jiao,Mengshu Kong,Zhenpeng Hu,Shiming Zhou,Xiaoxuan Xu,Lei Liu
Single-atom catalysts (SACs) can achieve excellent catalytic efficiency at ultralow catalyst consumptions. Herein, platinum (Pt) atoms are fixed on the wall of atomic layer deposition (ALD)-made molybdenum disulfide nanotube arrays (MoS 2 -NTA) for efficient hydrogen evolution reaction (HER). More concretely, MoS 2 -NTA with different nanotube diameters and wall thicknesses are fabricated by a sacrificial strategy of anodic aluminum oxide (AAO) template via ALD; then Pt atoms are fixed on the wall of Ti 3 C 2 -supported MoS 2 -NTA as a catalytic system. The MoS 2 -NTA/Ti 3 C 2 decorated with 0.13 wt.% of Pt results in a low overpotential of 32 mV to deliver a current density of 10 mA cm –2 , which is superior to 20 wt.% commercial Pt/C (41 mV). Ordered MoS 2 -NTA instead of 2D MoS 2 prevents Pt atoms from aggregating and then exerts catalytic activities. The density functional theory calculations suggest that the Pt atoms are more likely to occupy the sites on the tubular MoS 2 than the planar MoS 2 , and the Pt atoms accumulated at the Mo site of MoS 2 -NT have a moderate Gibbs free energy (close to zero).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 8
·2200018
·
IF 5.006
Guochao Yang,Qiuhui Zhang
To improve the flame retardant performance of plywood and reduce the reagent loss and moisture absorption of the flame retardant, a bio-based supramolecular flame retardant is prepared by vacuum-pressure impregnation and high-temperature in situ polymerization in plywood. The best value of bonding strength appears at 170 °C, and the limiting oxygen index (LOI) of 170BF-B plywood is 42.3%. After hot pressing, the moisture absorption rate of the 170BF-B veneer is only 18.51%, while the loss resistance rate achieves 83.45%. Its residue at 700 °C is 91.36% higher than that of poplar veneer. In the combustion process, the peak value of heat release rate (PHRR) and heat release rate (HRR) of 170BF-B plywood are only 10.69% and 37.11% of that of untreated plywood. After combustion, an intumescent flame retardant layer exhibits a graphitization trend. In the flame retardant layer, there are not only functional groups, such as P═O, PO 4 3− , P O C decomposed by flame retardant but also characteristic functional groups of wood fiber, like C═O, C H, etc. The prepolymer BF-B, which is composed of phytic acid, urea, and dicyandiamide polymerized with chitosan or lignocellulose to form a supramolecular flame retardant connected with P O C and P O N functional groups, thus improving the flame retardant and anti-loss property by in situ polymerization.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mohsin Ali Marwat,Habib Ullah,Muhammad Usman,Muhammad Ali Ehsan,Haibo Zhang,Muhammad Fawad Khan,Sher Ali,Muhammad Yousaf
Herein, motivated with narrow/wide-bandgap heterojunction materials as one of the perfect solutions, we separately synthesized BiFeO 3 (BFO) and SnO 2 nanoparticles ; then coupled them in various weight percentages to obtain nanocomposites with efficient contacts for visible light 2,4-DCP and RhB degradation and effectively reduced charge recombination. The material of interest, i.e., with six weight percentage coupling of SnO 2 (i.e., 6SO/94BFO), endorsed superior photoactivity for 2,4-DCP and RhB degradation. In addition, under the visible light irradiation, this photocatalyst degraded 87.2% of RhB and 65.1% of 2,4-DCP in 2h, which compared to pristine BiFeO 3 nanoparticles are about 2.6- and 2.7-times enhancements, respectively. The photoluminescence spectroscopy and mechanism model showed a substantial interface between BiFeO 3 and SnO 2 and unfeasible electron-holes recombination. The electrons and holes are entirely utilized to produce superoxides and •OH radicals, respectively, predicting enhanced visible-light photodegradation. Overall, this work offers novel narrow/wide-bandgap heterojunction nanocomposites as feasible aspirants for pollution control and effective visible light photodegradation of chlorinated compounds.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 19
·195202
·
IF 3.953
Shuling Zhou,Bin Xie,Xuan Yang,Xinfeng Zhang,Xiaobing Luo
Quantum dot (QD) features many exceptional optical performances but is also vulnerable to moisture which results in structural damage and luminescent decrease. This work provided and fabricated a novel superior hydrophobic methylated core/shell silica-coated QD (MSQ) for high water stability. QD was coated with a silica shell and then surface-methylated by trimethyl silane. Mercaptopropyl trimethoxy silane, tetraethyl orthosilicate, and ethoxy trimethyl silane were utilized as the ligand exchanger, the raw material of silica, and the surface modification, respectively. Characterization results illustrated the core/shell structure of MSQ. In addition, its water contact angle was up to 159.6°. QD-, silica-coated QD(SQ)-, and MSQ-silicone were made and displayed similar absorption, emission, and excitation spectra but different water stabilities. The photoluminescence intensity and photoluminescence quantum yield of MSQ-silicone hardly changed during 15 d of water immersion, in contrast to the dramatical decrease of other two kinds of composite silicone. Specifically, the photoluminescence quantum yield decreases of MSQ-, SQ-, and QD-silicone were 1%, 40%, and 43%, respectively. Therefore, MSQ had a much better water stability. The superior hydrophobic methylated silica-coated QD has a great potential to realize the long-term working stability in a humid environment and the wider application in diverse fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2022
·
IF 8.857
Xiaoya Zang,Jing Wang,Yong He,Xuebing Zhou,Deqing Liang
Tetrabutylammonium bromide (TBAB) is a typical thermodynamic additive that can enhance the hydrate equilibrium temperature . Additionally, semi-clathrate hydrates formed from TBAB solutions exhibit reasonable CO 2 adsorption performance. In this study, TBAB hydrates were synthesized to determine their carbon capture capacity from a ternary gas mixture of CH 4 /CO 2 /N 2 (0.5/0.4/0.1). We measured the effect of temperature, pressure, and TBAB mass fractions (0.05–0.2) on the formation of gas hydrates, which were analyzed using Raman spectroscopy, powder X-ray diffraction (PXRD), and cryo-scanning electron microscopy (Cryo-SEM). With a 0.05 TBAB aqueous solution, the maximum recovery factor of CH 4 was 1.646 at 290.1 K and 7.0 MPa, whereas the maximum CO 2 split ratio was 0.454 at a pressure of 7.0 MPa and temperature of 280.1 K. Furthermore, the cryo-SEM images revealed that the addition of TBAB significantly increased the specific surface area of the hydrate crystals compared with the pure water system. PXRD and Raman spectroscopy showed that the hydrate structure transformed from a SI to a semi-clathrate hydrate. The hydrate samples formed from the 0.05 TBAB solution were found to be type A and B, leading to greater gas consumption. These results are expected to provide support for hydrate gas separation technology.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Linsha Wei,Junyang Ding,Jiaqi Wu,Lai Li,Qipeng Li,Li-Xiong Shao,Jianmei Lu,Jinjie Qian
Due to the harmfulness of diabetes, a fast and efficient glucose detector is particularly important. Metal-organic polyhedron (MOP) provides a porous framework and a special matrix, which makes it an excellent precursor for electrochemical detection . Herein, we report a novel MOP as a precursor for the preparation of an electrocatalytic detector for glucose. The new metal-organic polyhedron of Cu 4 (TPDC) 4 can be solvothermally obtained and characterized by X-ray crystallography, which can be thermally converted into nanosized copper oxides embedded into graphitic carbon layers ( MOP-CO ). The as-prepared MOP-CO electrode is further applied to glucose detection, which shows a fast response time (<1 s) in a wide linear range of 0–4000 μM and high sensitivity of 2720 μA mM −1 cm −2 , as well as low detection limit (26 nM (S/N = 3)), good anti-interference, repeatability and stability (>3600 s).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4226-4232
·
IF 3.925
Zhiwen Li,Jiyue Zhang,Qiyao Sun,Wenwen Shi,Tingxian Tao,Yingqiang Fu
A new method of ratiometric fluorescence detection of moxifloxacin (MOX) was developed based on carbon quantum dots (CQDs). Through a one-step hydrothermal method using soluble starch and acetic acid buffer solution as precursors, blue fluorescent CQDs with excitation wavelength-dependence were prepared. MOX could combine with CQDs to form a CQDs/MOX through hydrogen bonding. The absorption spectrum of CQDs/MOX and the fluorescence emission spectrum of CQDs overlapped to a certain extent, which allowed for fluorescence resonance energy transfer (FRET) formation between CQDs/MOX and CQDs. For MOX detection, as the MOX concentration increased, the intensity of the fluorescence emission peak of CQDs decreased gradually, the intensity of the fluorescence emission peak of CQDs/MOX increased gradually, and the fluorescence emission peaks of CQDs and CQDs/MOX both had a red-shift. Based on the FRET system between CQDs and CQDs/MOX, a new method for ratiometric fluorescence detection of MOX was established. This method was more effective for MOX detection in the concentration range 3.3 × 10−7 to 2 × 10−6 M. Our method had high sensitivity and selectivity, and the limit of detection was 2.59 nM. The recovery rate of simulated water samples was 98.37–101.15%, which showed that this method was feasible for MOX analysis of actual water samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Yuqi Su,Songtao Cao,Taotao Zhan,Maogang He,Ying Zhang
The mutual diffusion coefficients of dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary systems were measured at temperatures from 288.15 K to 318.15 K with the mass fraction of dimethyl carbonate from 0.05 to 0.95 under atmospheric pressure. All the mutual diffusion coefficients we reported are Fick diffusion coefficients, which were measured by the digital holographic interferometry. The expanded relative uncertainty for the measured mutual diffusion coefficients is estimated to 2.4% with the level of confidence of 0.95 (coverage factor k = 2). Moreover, a theoretical model (UNIDIF) of mutual diffusion coefficients for dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary mixtures was given by fitting the experimental results, and the adjustable parameters and infinite dilution diffusion coefficients of these two solutions were given. The influences of temperature and composition on the mutual diffusion coefficients were discussed.
✓ 已验证
产品关联
DOI
高影响因子
Innovative Food Science & Emerging Technologies
·
2023
·
IF 6.6
Li-Shuang Wang,Xiao-Shuai Yu,Ke-Xin Wang,Jin-Jie Huo,Xiao-Qi Ma,Yu-Min Duan,Zhi-Gang Xiao,Peng Wang
The presence of glutelin plays an important role in the textural properties of reconstituted rice, but available information is limited. Herein, a comprehensive assessment of the effects of multi-scale structure and intramolecular interactions of glutelin on the textural properties of reconstituted rice was performed. The results demonstrated that the hardness, adhesiveness, and chewiness of reconstituted rice were improved as the added ratio of glutelin increased and the internal structure changed by forming compact flake-like, fibrous branches, more α-helix and β-sheet structure, and enhanced intermolecular interactions. Furthermore, extrusion promoted the generation of special aroma substances by the Maillard reaction . Correlation analysis revealed that the hardness, adhesiveness, and chewiness of reconstituted rice were significant positive correlation with Tp, ∆H, β-turn, random coil, and free SH content, and negative correlation with α-helix of glutelin. These observations provide better insights into strategies for producing reconstituted rice by extrusion.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhihong Lin,Ziyi Yuan,Kaifang Wang,Xuezhong He
Novel mixed matrix membranes (MMMs) with superior CO 2 /N 2 separation properties are of great importance for post-combustion CO 2 capture from flue gas . Metal-organic frameworks (MOFs) as one of the most attractive porous fillers for MMMs fabrication, are considered to provide a solid molecular sieving mechanism for enhancing CO 2 /N 2 selectivity. However, it causes the reduction in gas permeability and limits its further industrialization. Herein, we proposed a new strategy for filler functionalization by doping silver ions (Ag + ) into UiO-66-NH 2 nanoparticles through the double-solvent method and used for the preparation of advanced MMMs. The double-solvent method is benefits for the enrichment of Ag + in the hydrophilic pores of UiO-66-NH 2 . As a result, the prepared novel MMMs called Ag + @UiO@PIM-1 with the polymers of intrinsic microporosity (PIMs) as polymer matrix , show outstanding CO 2 permeability. According to the mixed gases (CO 2 /N 2 = 10:90) permeation experiments under 25 °C and 2 bar, the membrane with 30%Ag + @10%UiO loading achieves more than 65% increase in CO 2 /N 2 selectivity (∼30) and 120% in CO 2 permeability (>15,000 Barrer) compared to the pristine PIM-1 membrane. By optimizing the Ag + doping amount and Ag + @UiO loading content, the separation performance exceeds the 2019 CO 2 /N 2 upper bound. To figure out the separation mechanism, the pore texture properties and CO 2 affinity of the functional filler (Ag + @UiO) together with the membrane structure were characterized by XPS , PXRD , SEM, gas sorption , etc. The synergistic mechanisms by combing CO 2 facilitated transport and molecular sieving from pore regulation were identified to enable advanced CO 2 /N 2 membrane separation .
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaolei Wang,Wenxin Cao,Zhenhua Su,Kunlong Zhao,Bing Dai,Ge Gao,Jiwen Zhao,Kechen Zhao,Zhuochao Wang,Tingting Sun,Jiecai Han,Jiaqi Zhu
Polymer-based thermally conductive materials are preferred for heat dissipation owing to their low density, flexibility, low cost, and easy processing. Researchers have been trying to develop a polymer-based composite film with excellent thermal conductivity (TC), mechanical strength, thermal stability, and electrical properties. However, synergistically achieving these properties in a single material is still a challenge. To address the above requirements, we prepared poly(diallyldimethylammonium chloride)-functionalized nanodiamond (ND@PDDA)/aramid nanofiber (ANF) composite films using a self-assembly strategy. Owing to a strong interfacial interaction arising from electrostatic attraction, ND particles attract strongly along the ANF axis to form ANF/ND “core–sheath” arrangements. These assemblies self-construct three-dimensional thermally conductive networks through ANF gelation precipitation, which was analyzed as the key parameter for the realization of high thermal performances. The as-prepared ND@PDDA/ANF composite films exhibited high in-plane and through-plane TCs up to 30.99 and 6.34 W/m·K, respectively, at a 50 wt % functionalized ND loading, representing the optimal values among all previously reported polymer-based electrical insulating composite films. Furthermore, the nanocomposites also achieved other properties necessary for realistic applications, such as outstanding mechanical properties, excellent thermal stability, ultra-low thermal expansion coefficient, excellent electrical insulation, low dielectric constant, low dielectric loss, and outstanding flame retardancy. Thus, this excellent comprehensive performance enables the ND@PDDA/ANF composite films to be used as advanced multifunctional nanocomposites in thermal management, flexible electronics, and intelligent wearable equipment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2023
·
IF 8.3
Yuanyuan Chen,Hanqing Dai,Zhe Hu,Jinxin Wei,Wenjie Zhou,Zhongtao Duan,Zhongjie Cui,Wei Wei,Guoqi Zhang,Wanlu Zhang,Ruiqian Guo
Hydrogel materials have biocompatibility, flexibility, transparency, self-healing ability, adhesion with various substrates, anti-freeze ability, and high-temperature resistance. However, the existing hydrogel devices cannot continue to operate in the case of damage, and they cannot work during the repair period, which brings great challenges and threats to life safety. Herein, we have designed a bio-inspired combinable low-power device by imitating the generation of nerve signals whose components can be disassembled and can continue to operate during the period of reconstruction. And the mechanism and determinants of the above phenomena are revealed. The results indicate that this device can establish some information interaction relationships with the body or its surroundings to reflect and identify certain changes, implying that it will possess promising potential in feedback systems, power transformers, intelligence systems, soft robotics, wearable devices , implanted electronics with flexible characteristics matching biological tissues, etc.
✓ 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）