JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Rui Qi,Baohua Liu,Hongmei Li,Jian Wang,Xiaohong Li,Yong Jin,Songzhi Xie
Controlling the shape and size of the nanomicelles attracts great interest and is still challenging. Herein, we synthesized a kind of diblock copolymers with the hydrophilic block (poly (ethylene glycol) methyl ether, PEG) and the core-forming block composed alternately by hydrophobic segments, hydrogen-bonding carbamates and pH-responsive groups. The synergy effect of the pH variation and the core-forming block length on the morphologies of the assemblies was well studied. Ultrathin scarf-like micelles, ultrathin disk-like micelles and spherical micelles were obtained by tailoring the pH values and the lengths of the core-forming blocks. The ultrathin scarf-like micelles and ultrathin disk-like micelles were proved to be composed of a lamellar bimolecular layer of the block copolymers. This study will supply an effective method to fabricate well-defined nanostructures.
研究领域:
高分子化学
·
纳米材料科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Dou Zhang,Bo-hui Li,Yi-lei Li,Jun Zhao,Xiao-jing Wang,Fa-tang Li
The efficient conversion of CO 2 to carbon-neural fuels by photocatalysts can effectively address the increasingly prominent challenges of environmental pollution and energy shortage. TiO 2 is considered a promising photocatalyst. However, its disadvantages, such as poor adsorption of CO 2 and low carrier separation efficiency, inhibit its performance and selectivity in photocatalytic CO 2 reduction. Herein, K + -modified anatase TiO 2 ultrathin nanosheet photocatalysts were obtained via a reverse etching method using K 2 Ti 8 O 17 as the precursor. The selectivity of the optimized photocatalyst for methane was 96.02% in a gas–solid system without additives, with an excellent photocatalytic rate of 42.3 μmol·g −1 ·h −1 , which was 3.39 times higher than that of P25. The effects of K + on photocatalytic behaviors and the selectivity of CH 4 was systematically investigated. The test results showed that during treatment with formic acid, a large amount of K + from the layered K 2 Ti 8 O 17 were removed and the original structure was destroyed. Therefore, highly dispersed TiO 2 nanosheets were obtained, with a small amount of K + remaining on the TiO 2 surface. The well-defined rectangular shapes of TiO 2 reduce the transmission distance of photogenerated carriers, whereas the presence of K + increase the chemisorption of CO 2 molecules, thereby activating CO 2 , promoting the conversion of bridge *CO to -CHO, and increasing CH 4 production. This study provides insightful references for the preparation and modification of traditional photocatalysts for photocatalytic CO 2 reduction reactions.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 10
·1118
·
IF 2.935
Tianhao Jiang,Chaoqun Shang,Qingguo Meng,Mingliang Jin,Hua Liao,Ming Li,Zhihong Chen,Mingzhe Yuan,Xin Wang,Guofu Zhou
Herein, we synthesized BiOBr/ultrathin g-C3N4/ternary heterostructures modified with black phosphorous quantum dots using a simple water bath heating and sonication method. The ternary heterostructure was then used for the photocatalytic degradation of tetracycline in visible light, with an efficiency as high as 92% after 3 h of irradiation. Thus, the photodegradation efficiency is greatly improved compared to that of ultrathin g-C3N4, BiOBr, and black phosphorous quantum dots alone. The synthesized ternary heterostructure improves the charge separation efficiency, thus increasing the photodegradation efficiency. This work provides a new and efficient method for the degradation of antibiotics in the environment.Keywords:BiOBr;ultrathin g-C3N4;black phosphorous quantum dots;photodegradation;antibiotics
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kaiyue Gao,Chengming Zhang,Yi Zhang,Xiaoyu Zhou,Shuo Gu,Kehua Zhang,Xiufang Wang,Xiaojie Song
The conversion of N 2 to NH 3 is one of the most promising processes in maintaining natural life and chemical production. Photocatalytic nitrogen reduction reaction (NRR) has the advantage of clean and sustainable, which is considered to be an ideal synthesis technology. In this work, we report the successful synthesis of Bi 12 O 17 Br 2 ultrathin nanosheets through simple alkali treatment and solvothermal method . The Bi 12 O 17 Br 2 ultrathin nanosheets can improve the separation of carriers and the transfer of photogenerated electrons to N 2 molecules, thus improving the photocatalytic efficiency. Of note, the higher Bi/Br atomic ratio in Bi 12 O 17 Br 2 is beneficial to broaden the light absorption edge, and the high concentration of O atoms is easy to produce oxygen vacancies on the surface during the synthesis process of Bi 12 O 17 Br 2 . The abundant oxygen vacancies and high specific surface area enable N 2 molecules and water to have powerful chemical adsorption and activation. In addition, the photocatalytic reduction of N 2 to NH 3 in pure water shows excellent and stable performance, and the average generation rate of NH 3 reaches up to 620.5 μmol·L -1 ·h −1 . This study discovers that rich oxygen vacancies and ultrathin morphology may have a significant part in the process of the photocatalytic nitrogen reduction reaction.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Engineering
·
2022
·
IF 12.834
Yanqiu Zhang,Fan Yang,Hongguang Sun,Yongping Bai,Songwei Li,Lu Shao
Although nanoporous membranes are of great interest in desalination, it is still challenging to construct highly permeable nanoporous membranes with excellent rejections for an efficient desalination process. In this work, highly permeable nanoporous membranes were built from renewable resources, assisted by the versatile functions of glucose and dopamine, with coupling reactive groups via interfacial reaction with 1,3,5-benzenetricarbonyl trichloride (TMC). The small molecules (0.66 nm) of glucose, which have high hydrophilicity, can diffuse into the membrane for an effective reaction to ensure structural integration. Our novel ultrathin (∼44 nm) nanofiltration (NF) membrane exhibits ultra-high Na 2 SO 4 flux and excellent rejection of Na 2 SO 4 (66.5 L∙m −2 ∙h −1 , 97.3%) and MgSO 4 (63.0 L∙m −2 ∙h −1 , 92.1%) under a pressure of 5 bar (1 bar = 10 5 Pa) which is much superior to the performance of natural-product NF membranes. The membrane demonstrates excellent long-term stability, as well as tremendous acid-base and alkali-base stability and high anti-pollution capacity. The designed membrane materials and architecture open a new door to biopolymer-based separation membranes beyond existing membrane materials.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Jinming Hu,Shengting Zhu,Ying Lv,Ronghui Guo,Min Gu,Yinan Zhang
Holography, as a technique for coherent wavefront reconstruction, is extensively used in numerous optical applications such as optical imaging, 3D display, photolithography, and optical artificial intelligence. In order to achieve highly compact and functional integration with optoelectronic devices, the hologram needs to possess ultrathin thickness as well as multicolor functionality. However, its thickness is typically limited to optical wavelength ranges due to the requirement for pronounced amplitude or phase modulation, and it generally operates at a single wavelength band without wavelength-multiplexed channels. Here, the hologram is decreased thickness to sub-ten nanometers by exploiting the large refractive index and strong exciton absorption of 2D perovskites. Ultrathin perovskite holograms and holographic neural networks with high stability are successfully developed by using femtosecond laser direct writing, and their operation wavelength can be rationally tuned from 400–515 nm through halide anion engineering. Consequently, the wavelength can be multiplexed with low cross-talks by stacked perovskite nanolayers for applications of holographic display and neural networks without the usages of complex optical structures or filters. This work provides a feasible and promising technical route for integrating ultrathin, high pixel density, and multiplexed holographic structures with flat optoelectronic devices for next-generation integrated optical systems.
研究领域:
光学
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材料科学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 26
·16043-16051
·
IF 10.7
Keying Su,Shan Yang,Yulu Zhu,Yujia Liang,Yawen Tang,Xiaoyu Qiu
High-entropy alloy (HEA) nanoparticles have been recognized as one kind of efficient electro-catalyst for water splitting. However, their higher catalytic activity is restrained by the difficulty in precisely shaping the HEAs into ordered facets and fully exposed surface structures. Herein, we report a seed-mediated conformal growth and partial etching method for the controlled synthesis of PtIrRuRhPd HEA cubic nanocages (CNCs), which feature the ordered {100} facets and ultrathin shells of five atomic layers. The slow injection of a PtIrRuRh layer on Pd nanocubes and the subsequent capture of dissociative Pd atoms in the etching step are responsible for the formation of nearly equimolar PtIrRuRhPd HEAs. Due to the synergistic effects derived from the multicomponent high-entropy effects, the ordered (100) facets, and the ultrathin feature, the PtIrRuRhPd HEA CNCs exhibit significantly high electro-catalytic activities for hydrogen and oxygen evolution reactions in an acidic medium, with overpotentials of 20 mV and 272 mV at 10 mA cm−2 (η10), respectively. As electrodes for a water electrolyzer, the PtIrRuRhPd HEA CNCs afford an η10 as low as 196 mV, together with superior long-term durability for 200 000 s.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Yuhang Guo,Hong Wu,Shaoyun Guo,Jianhui Qiu
Bimodal pore structure design of separation membranes is a promising way to simultaneously improve permeability and selectivity. However, the thickness limitation of bimodal porous membranes is an obstacle to further improving the separation efficiency. In this study, a novel bimodal porous structure with uniform small pores on the surface and a unique laminated large pore structure in the thickness direction was successfully constructed through biaxial stretching of gel films in ultra-high molecular weight polyethylene membranes. With an increase in the draw ratio to 12 × 12, the uniformly refined small pores increased the rejection rate of the carbon nanoparticle solution (particle size distribution of 60–400 nm) to 99.4%, and the unique laminated large pore structure enabled the permeance to reach 1141.8 L m -2 h −1 bar −1 . By further increasing the draw ratio to 16 × 16, the membrane thickness decreased to 0.91 μm and the permeance was further increased to 2008.2 L m -2 h −1 bar −1 while the selectivity slightly decreased to 98.9%. Furthermore, a bimodal porous membrane with sufficient strength (237 MPa of 16 × 16) was efficient for long-term water separation. This study proposes a new design idea for ultrathin porous membranes, which can be further expanded to prepare various antifouling, self-cleaning, and multifunctional separation membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
TOPICS IN CATALYSIS
·
2021
·Vol. 64
·期 7
·559-566
·
IF 2.91
Chen Fangyuan,Mu Kelei,Zhang Dongpeng,Mi Xueyue,Li Yi,Shen Zhurui,Zhan Sihui
As a photocatalyst responding to visible light, red phosphorus has the advantages of cheap and easy availability, low toxicity and suitable band gap. In this work, ultra-thin red phosphorus (URP) with the narrower band gap through ultrasound for 8 h was successfully synthesized. Though a series of characterization (such as: XPS analysis, photoelectric response analysis, Raman analysis, AFM images, etc.), the narrow band gap and ultra-thin nanosheet structure could promote the generation of more photogenerated electrons and effectively improve the separation rate of photogenerated charges for highly efficient hydrogen evolution. URP showed the excellent photocatalytic hydrogen production without any cocatalysts (0.55 mmol g −1 h −1 ), which was 2.88 times for untreated red phosphorus. In addition, URP overcame the limited stability and decreased the band gap of red phosphorus, producing hydrogen at a rate of 0.16 mmol g −1 h −1 after three cycles. This readily available and ultra-thin material can be used as a substrate material for other materials due to its similar graphene thickness.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 5
·1172-1180
·
IF 3.117
Qibing Dong,Chao Shuai,Zunli Mo,Ruibin Guo,Nijuan Liu,Guigui Liu,Jia Wang,Wentong Liu,Ying Chen,Jingjing Liu,Yangyang Jiang,Qinqin Gao
A Ni-based metal organic framework (Ni-BDC) and subsequently derived NiFe-LDH were studied to overcome the defect of the low availability of active sites for the oxygen evolution reaction (OER) during the water splitting process. This work reported NiFe-LDH nanosheets with an ultra-thin structure through an in situ surface-conversion derived from Ni-BDC. The unique structure and characteristic morphology were confirmed using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy, and the OER activities of the catalysts were systematically studied. The obtained results indicated that the synthesized Ni-BDC@NiFe-LDH-2 showed excellent OER activity, with a low overpotential of 272 mV at a current density of 10 mA cm−2, a small Tafel slope of 45 mV dec−1, and excellent stability, owing to the addition of abundant metal sites and the expansion of the electron transport channels during the conversion process to form the ultra-thin layer structure. This work provides a novel strategy for the application, design, and manufacture of metal organic framework (MOF)-based high-efficiency active materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 19
·6316-6323
·
IF 7.393
Yuexuan Li,Yugang Duan,Xiaoqing Kang
Microwave absorption materials (MAMs) are specialist kinds of composites applied in stealth technology and electromagnetic interference (EMI). However, it is tough to satisfy the ultrathin and broadband requirements due to the imperfect impedance matching with external air and single absorbing fillers. Herein, a lower concentration of short carbon fiber (SCF)/Prussian blue (PB)/Fe3O4/epoxy resin (EP)-based butterfly-scale metamaterial (BSM) absorber with ultrathin and broadband was achieved via integrated design and fabrication. This revealed that the synergic effect between the SCF/PB/Fe3O4/EP MAMs with dielectric–magnetic behavior and physical resonance loss of the periodic unit for the BSM absorber is profitable for improving the electromagnetic absorption performance. Furthermore, the integrated fabrication process completely avoided the interface effect in traditional metamaterials. As a result, the proposed BSM absorber exhibited an absorption bandwidth of 29.54 GHz below −9.5 dB (>88.7% absorption) under TE = 0° polarization in the 2–40 GHz frequency range and 35 GHz below −9.5 dB under TM = 50° polarization. Analysis of the micro- and macro-absorption mechanism implied that the magnetic loss mainly resulted in power loss compared with dielectric loss. This highlights that the BSM absorber is an appropriate candidate for further practical applications, such as communication devices and military equipment.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2017
·Vol. 10
·期 13
·2788-2795
·
IF 7.226
Yong Du,Chao Zhang,Qi-Zhi Zhong,Xi Yang,Jian Wu,Zhi-Kang Xu
Graphical Some thin good : Ultrathin cross-linked alginate coatings can be fabricated through combination of a sustainable contra-diffusion method and substrate surface modification. The as-prepared membranes demonstrate good mono-/divalent ion selectivity and antifouling properties, as well as one order of magnitude higher water permeance than other alginate nanofiltration membranes. It is highly desirable to develop environmentally friendly processes for fabricating thin-film composite (TFC) nanofiltration membranes (NFMs) from natural materials. However, the nanofiltration performance of such TFC NFMs is not satisfactory for practical applications owing to the lack of efficient methods for constructing ultrathin, uniform, stable coatings as selective layers. In this study, a contra-diffusion strategy is used to fabricate TFC NFMs with ultrathin cross-linked alginate coatings as selective layers without the use of any organic solvents. The as-prepared NFMs show a water permeation flux that is nearly one order of magnitude higher than that of other alginate-based TFC NFMs with similar salt rejection, and represents the best performance among all TFC NFMs from natural materials. These NFMs also demonstrate excellent mono-/divalent ion selectivity, as well as good long-term operation stability and antifouling properties. Furthermore, this strategy maximizes the reactant usage rate, minimizes the waste discharge and provides new insight into environmentally friendly fabrication of TFC NFMs.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）