BIOMACROMOLECULES
·
2023
·
IF 6.2
Han Hu,Qingyang Luan,Jiayi Li,Chen Lin,Xingyu Ouyang,Dong-Qing Wei,Jinggang Wang,Jin Zhu
Disulfide bonds have attracted considerable attention due to their reduction responsiveness, but it is crucial and challenging to prepare disulfide-bond-based polyesters by melt polycondensation. Herein, the inherently poor thermal stability of the S–S bond in melting polycondensation was overcome. Moreover, poly(butylene succinate-co-dithiodipropionate) (PBSDi) with a light color and high molecular weights (Mn values up to 84.7 kg/mol) was obtained. These polyesters can be applied via melt processing with Td,5% > 318 °C. PBSDi10-PBSDi40 shows good crystallizability (crystallinity 56–38%) and compact lamellar thickness (2.9–3.2 nm). Compared with commercial poly(butylene adipate-co-terephthalate) (PBAT), the elevated mechanical and barrier performances of PBSDi make them better packaging materials. For the degradation behavior, the disulfide monomer obviously accelerates the enzyme degradation but has a weaker effect on hydrolysis. In 0.1 mol/L or higher concentrations of H2O2 solutions, the oxidation of disulfide bonds to sulfoxide and sulfone groups can be realized. This process results in a stronger nucleophilic attack, as confirmed by the Fukui function and DFT calculations. Additionally, the greater polarity and hydrophilicity of oxidation products, proved by noncovalent interaction analysis, accelerate the hydrolysis of polyesters. Moreover, glutathione-responsive breakage, from polymers to oligomers, is confirmed by an accelerated decline in molecular weight. Our research offers fresh perspectives on the effective synthesis of the disulfide polyester and lays a solid basis for the creation of high-performance biodegradable polyesters that degrade on demand.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xin Zhang,Ruirui Cui,Min Zhang,Chaoyong Deng
The development of white light emitting diodes (WLEDs) prepared with tricolor phosphors is limited by issues such as reabsorption, difficulty in controlling sample proportions, low thermal stability, etc . This study synthesized a series of single-host Ca 2 GdNbO 6 : x Dy 3+ (CGNO: x Dy 3+ ) phosphors using High-temperature Solid-state Reaction. Then the structure characteristics, luminescence, thermal stability, and morphology were analyzed in detail. The results showed that all the samples, emitted white light superposed by the blue at 483 nm and the yellow light at 575 nm under near-ultraviolet excitation, exhibit good quantum yield, excellent optical properties, and good moisture resistance. Besides, the CIE chromaticity coordinates (CIE) and luminous pictures of CGNO: x Dy 3+ phosphors both at 352 nm and 389 nm were investigated. Then, the properties of LED devices obtained by coating the aforementioned phosphors on 365 nm and 395 nm chips were characterized. The research confirmed that CGNO: x Dy 3+ are potential single-host white light phosphors in the field of lighting.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xinyan Fan,Yonggui Wang,Yanjun Xie,Zefang Xiao,Haigang Wang
Among stimuli-responsive actuators, light-driven hydroplaning actuators have attracted significant attention because of their controllable and contactless nature. However, manufacturing actuators with rapid dynamic responses to a single stimulus remains challenging. Herein, inspired by rove beetles and water striders, we developed superhydrophobic light-driven actuators based on the in situ growth of copper sulfide on cellulose nanofiber and subsequent modification with octadecyltrimethoxysilane. The actuators exhibited excellent superhydrophobicity (water contact angle of 160.6°) and the water contact angle was maintained above 150° under various harsh conditions (acid/base immersion, ultraviolet irradiation, heat treatment, and sandpaper abrasion). Under near-infrared (NIR) irradiation (808 nm, 1.4 W cm −2 ), excellent photothermal performance was achieved, with a photothermal-induced temperature change of 81.0 °C. Based on the mechanisms of superhydrophobicity, the Marangoni effect, and vapor jet flow, the light-driven actuators exhibited a rapid dynamic response (response time of 0.5 ± 0.2 s), ensuring fast linear motion (velocity of 8.7 ± 0.7 mm s −1 ) and flexible rotation (angular speed of 2.4 rad s −1 ) under NIR irradiation. Moreover, complex motions such as S-shaped, triangular, and circular motions were achieved by combining linear motion and rotation, which could facilitate obstacle avoidance, smart transportation, and contactless delivery.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Coal Preparation and Utilization
·
2023
·
IF 2.1
Han Guo,Min Liu,Haichang Yang,Erfa Ding,Shiqi Dai,Yijun Cao,Xiahui Gui,Mengdi Xu,Xing Yaowen
Wettability is an important interfacial property that affects the separation of micro-fine particles. This paper carried out a new approach to evaluate the wettability of low-rank coal (LRC) powder based on multiple light scattering. Four collectors are used to modify the coal powder to obtain different wettabilities. The stability analyzer is used to investigate the wettability and wetting process of coal sample, which is observed by transmitted light. The stability of coal samples dispersed in a sample cell completely wetted by water is analyzed by Turbiscan Stability Index (TSI). The TSI value shows that stronger wettability of coal sample can make the system less stable. Moreover, the change law of the transmitted light shows that the coal sample with high wettability is quickly wetted by water, resulting in a shorter time for the transmitted light intensity (T) to decrease to 0% due to the volume concentration of the particles entering the water phase increase rapidly. Therefore, the wettability is characterized by the variation time of T. The shorter time represents the stronger wettability. While ΔT/t is used as an evaluation of the wetting rate, the larger absolute value shows a faster wettability rate. This provides a basis for rapid and accurate evaluation of the wettability of LRC samples.
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yanting Dou,Yu Gao,Deng Gu,Jiqi Zheng,Bo Zhang,XiuXin Li,Meijia He,Qinglong Zou,Tiaoli Liao,Fu Ding,Yaguang Sun,Zhenhe Xu
Developing a photocatalyst that can effectively utilize the full solar spectrum remains a high-priority objective in the ongoing pursuit of efficient light-to-chemical energy conversion. Herein, the ternary nanocomposite g-C3N4/RGO/W18O49 (CN/RGO/WO) was constructed and characterized by a variety of techniques. Remarkably, under the excitation of photon energies ranging from the ultraviolet (UV) to the near-infrared (NIR) region, the photocatalytic performance of the CN/RGO/WO nanocomposite exhibited a significant enhancement compared with single component g-C3N4 or W18O49 nanosheets for the degradation of methyl orange (MO). The MO photodegradation rate of the optimal CN/1.0 wt% RGO/45.0 wt% WO catalyst reached 0.816 and 0.027 min–1 under UV and visible light excitation, respectively. Even under low-energy NIR light, which is not sufficient to excite g-C3N4, the MO degradation rate can still reach 0.0367 h–1, exhibiting a significant enhancement than pure W18O49. The outstanding MO removal rate and stability were demonstrated by CN/RGO/WO nanocomposites, which arise from the synergistic effect of localized surface plasmon resonance effect induced by W18O49 under vis–NIR excitation and the Z-scheme nanoheterojunction of W18O49 and g-C3N4. In this work, we have exploited the great potential of integrating nonmetallic plasmonic nanomaterials and good conductor RGO to construct high-performance g-C3N4-based full-solar spectral broadband photocatalysts.
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 23
·7810
·
IF 4.6
Truong Nguyen Xuan,Dien Nguyen Thi,Quang Tran Thuong,Tue Nguyen Ngoc,Khanh Dang Quoc,Zsombor Molnár,Shoaib Mukhtar,Erzsébet Szabó-Bárdos,Ottó Horváth
Graphitic carbon nitride (g-C3N4) has proved to be a promising heterogeneous photocatalyst in the visible range. It can be used, among others, for the oxidative conversion of environmentally harmful nitrophenols occurring in wastewater. However, its photocatalytic activity needs to be enhanced, which can be achieved by modification with various dopants. In our work, copper-modified g-C3N4was prepared by ultrasonic impregnation of the pristine g-C3N4synthesized from thiourea. The morphology, microstructure, and optical properties of the photocatalysts were characterized by XRD, FT-IR, DRS, SEM, XPS, and TEM. DRS analysis indicated a slight change in both the CB and the VB energies of Cu/g-C3N4compared to those of g-C3N4. The efficiency of the photocatalysts prepared was tested by the degradation of nitrophenols. Copper modification caused a sevenfold increase in the rate of 4-nitrophenol degradation in the presence of H2O2at pH = 3. This dramatic enhancement can be attributed to the synergistic effect of copper and H2O2in this photocatalytic system. A minor Fenton reaction role was also detected. The reusability of the Cu/g-C3N4catalyst was demonstrated through five cycles. Copper-modified g-C3N4with H2O2proved to be applicable for efficient visible-light-driven photocatalytic oxidative degradation of nitrophenols.Keywords:graphitic carbon nitride;photocatalysis;copper-modification;oxidation of nitrophenols;visible-light irradiation;pH effect;H2O2effect
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2023
·
IF 7.3
Zihan Xue,Xiang Yu,Xuebin Ke,Jian Zhao
Microplastic pollution has attracted considerable attention. Here, we develop a visible-light-driven photocatalysis and photothermal Fenton-like reaction method for their removal, utilizing an α-Fe2O3 nanoflower on TiO2 with a hierarchical structure of inverse opal-like layer/nanotube arrays (α-Fe2O3/TiO2HNTAs film). Without external H2O2 dosage, nearly 100% degradation of 310 nm polystyrene (PS) spheres is obtained after 4 h at 75 °C induced by visible-light irradiation. The light initiation and photothermal effect are essential for achieving high degradation efficiency of plastics on α-Fe2O3. A distinctive melting phenomenon of PS under mild conditions due to the synergistic effect is observed for the first time. The catalyst system also works well for PS spheres with large particle size (2.0–2.9 μm) and real PS plastic foam. We believe that this work provides a novel strategy and new insights for removing microplastics and bulk plastics.
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Baiyu Chen,Man Zhang,Kaili Yao,Churu Zhang,Qi Wu,Tianding Hu,Shaoyun Shan
Metal-organic frameworks (MOFs) have attracted exciting application prospects in photocatalytic hydrogen (H 2 ) evolution due to the diversity of organic ligands and metal ions . However, the inappropriate conduction band position of pristine MOFs and corresponding large overpotential for H 2 evolution restrict the H 2 production under visible light. Herein, a dye-sensitized NH 2 -UiO-66 anchored with copper ions (EY-6Cu-NU-66) was synthesized by in-situ Cu anchoring followed by Eosin Y sensitization. The H 2 production activity showed that EY-6Cu-NU-66 reached 3579.82 μmol·g −1 ·h −1 under visible light, which was four times higher than that of dye-sensitized pristine NU-66 (EY-NU-66) and 99-fold higher than that of 6Cu-NU-66 free of dye sensitization. A series of characterizations and theoretical computations indicated that photo-generated electrons first transfer from the excited Eosin Y to the lowest unoccupied molecular orbital (LUMO) of the NU-66, then further transfer to the transition Cu II /Cu I metal center that is formed by Cu anchored on -NH 2 . This tandem mechanism not only improves the visible-light absorption ability of NU-66 but also promotes its separation efficiency of photo-generated carriers, thus greatly reducing the overpotential for H 2 evolution. This work provides a new strategy for visible-light-driven H 2 production by dye-sensitized MOF-based materials without noble metal loading.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 46
·18785-18793
·
IF 6.7
Shan Yang,Songbin Liu,Yuxuan Qiu,Yu Liao,Ze Zhang,Di Wu,Xinyu Ye
Near-infrared-to-ultraviolet (NIR-to-UV) multiphoton upconversion has recently received increasing attention owing to its promising frontier applications in the fields of biomedicine and nanophotonics. However, the realization of high-efficiency NIR-to-UV upconversion remains a dispiriting challenge due to weak excitation light harvesting and photo-conversion efficiency. Herein, we propose a mechanistic strategy to achieve intensified UV upconversion by manipulating the injected excitation energy flux. A simple LiYbF4:Tm@LiYF4 host-sensitized sublattice core–shell nanostructure was initially proposed to compete with the concentration quenching effect and increase energy transfer efficiency. Then, the organic dye ICG was further coated to introduce the antenna sensitization effect to highly increase the absorption ability of nanocrystals. After optimizing the ICG number loaded on the surface and separation distance, up to 167-fold UV upconversion emission enhancement was achieved under low-power excitation of 808 nm. More importantly, the efficient UV upconversion exhibits enhanced reactive oxygen species (ROS) generation activity by fabricating a TiO2-modified upconversion nanocomposite, revealing great application potential in frontier fields such as in vivo photodynamic therapy and bioimaging-guided therapeutics. Our results can provide versatile designs to achieve efficient UV upconversion, overcome conventional limitations, and offer exciting opportunities for potential applications in biomedical fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaoguang Zhao,Yili Tang,Jie Wang,Yihang Li,Daokui Li,Xiaochao Zuo,Huaming Yang
Fully stimulating the capacity of light-driven phase change materials (PCMs) for efficient capture, conversion, and storage solar energy requires an ingenious combination of PCMs, supporting structural materials, and photothermal materials, therefore motivating the synergistic effects between the components. Herein, this work thoroughly explores the interaction forces between PCMs and supporting structural materials and the synergy between PCMs and photothermal materials in photothermal conversion. Rejoicingly, when capitalizing on the prepared directional channel structure of hierarchically porous composite aerogel (PEPG) as a supporting structural material, a superior paraffin wax (PW) encapsulation rate of 85.11% is achieved, and the prepared PEPG2-PW has a high phase change enthalpy of 182.9 J/g. The van der Waals force and Lewis acid-base action between PEPG and PW molecules reveal the excellent stabilities of PEPG-PW. More importantly, the PEPG2-PW has an ultrahigh photothermal conversion efficiency of 95.2% under 1 sun irradiation and durability. Most importantly, the COMSOL Multiphysics software calculations demonstrate that transparent PW can anchor sunlight on the surface of graphite nanoplates, converting it into heat by enhancing the loss of graphite backbone lattice vibrations, and the accumulated heat is then stored in molten PW. This work provides some design principles for high-efficiency solar-thermal conversion materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Qingqian Wang,Hongmei Zhu,Yangzhi Tan,Junjie Hao,Taikang Ye,Haodong Tang,Zhaojin Wang,Jingrui Ma,Jiayun Sun,Tianqi Zhang,Fankai Zheng,Wenda Zhang,Hoi Wai Choi,Wallace C. H. Choy,Dan Wu,Xiao Wei Sun,Kai Wang
Chiral-induced spin selectivity (CISS) effect provides innovative approach to spintronics and quantum-based devices for chiral materials. Different from the conventional ferromagnetic devices, the application of CISS effect is potential to operate under room temperature and zero applied magnetic field. Low dimensional chiral perovskites by introducing chiral amines are beginning to show significant CISS effect for spin injection, but research on chiral perovskites is still in its infancy, especially on spin-light emitting diode (spin-LED) construction. Here, the spin-QLEDs enabled by 2D chiral perovskites as CISS layer for spin-dependent carrier injection and CdSe/ZnS quantum dots (QDs) as light emitting layer are reported. The regulation pattern of the chirality and thickness of chiral perovskites, which affects the circularly polarized electroluminescence (CP-EL) emission of spin-QLED, is discovered. Notably, the spin injection polarization of 2D chiral perovskites is higher than 80% and the CP-EL asymmetric factor ( g CP-EL ) achieves up to 1.6 × 10 −2 . Consequently, this work opens up a new and effective approach for high-performance spin-LEDs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 11
·1391
·
IF 3.9
Taoming Yu,Doudou Wang,Lili Li,Wenjing Song,Xuan Pang,Ce Liang
The design of highly efficient organic/inorganic photocatalysts with visible-light response has attracted great attention for the removal of organic pollutants. In this work, the polyacrylonitrile (PAN) worked as the matrix polymer, while polyaniline (PANI) and Sb2S3–ZnO were used as organic/inorganic photocatalysts. The heterojunction PAN/PANI–Sb2S3–ZnO photocatalyst was prepared using electrospinning and surface ultrasound. PAN/PANI–Sb2S3–ZnO exhibited an excellent visible-light absorption intensity in the wavelength range of 400–700 nm. The maximum removal efficiencies of PAN/PANI–Sb2S3–ZnO for four organic dyes were all greater than 99%. The mechanism study showed that a dual Z-scheme could be constructed ingeniously because of the well-matched bandgaps between organic and inorganic components in the photocatalyst, which achieved efficient separation of photogenerated carriers and reserved photogenerated electrons (e−) and holes (h+) with strong redox ability. The active species •OH and •O2−played an important role in the photocatalytic process. The composite photocatalyst also had excellent stability and reusability. This work suggested a pathway for designing novel organic/inorganic composite photocatalysts with visible-light response.Keywords:photocatalyst;Sb2S3;PANI;ZnO
✓ 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）