CHEMISTRY OF MATERIALS
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2023
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IF 8.6
Shan Ye,Wenjing Ma,Guodong Fu
The bilayer hydrogel actuators have attracted extensive attention for their unique stimulus-responsive properties. Most of the current research studies only focused on changing the constituent materials of two layers in the fixed bilayer structure to enhance the responsive deformability of bilayer hydrogels without involving the exploration on a structural level, which limited its further development. In this study, we proposed a novel bilayer-co-gradient structure constructed via a simple and low-cost structural programming strategy, which was self-assembled by introducing an embedded gradient structure into a single bilayer structure with the assistance of gradient-dissolved oxygen in nature. This multistructure endowed the hydrogel with a faster bending response than a single bilayer structure due to the synergistic asymmetry of the simple bilayer structure and the embedded gradient structure. It was found that the prepared hydrogels exhibited significantly anisotropic electrical conductivity and swelling properties. Moreover, the stimulus-responsive shape deformation exhibited superior temperature- and pH-based deformation programmability. Additionally, this hydrogel could serve as a hydrogel gripper to perform grasping behavior, which demonstrated that our study opens up a new route for designing and fabricating smart actuators.
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高影响因子
JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Renping Cao,Caiping Chen,Fangrui Cheng,Ting Chen,Bang Lan,Lan Li,Ru Liu,Jing Wang
In this work, we synthesize Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Ca 3 Bi(PO 4 ) 3 :Eu 3+ , and Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ . The crystal structure, phase purity, and the luminescence properties of samples are investigated, respectively. Ca 3 Bi(PO 4 ) 3 :Dy 3+ under excitation at 350 nm shows yellow emission because of the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ . Ca 3 Bi(PO 4 ) 3 :Eu 3+ with excitation at 394 nm emits red-orange emission due to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Eu 3+ with excitation at 394 nm mainly shows the emission of Eu 3+ , however, that with excitation at 350 nm mainly derive from Dy 3+ ion. We investigate the effects of the ratio between Dy 3+ and Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ on the luminescence properties. The energy transfer from Dy 3+ to Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ is found. We analyze the luminous mechanism of samples by energy level diagrams of Dy 3+ and Eu 3+ ions. The results are helpful for the research of other Dy 3+ and Eu 3+ co-doped luminescence materials.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xiaodi Zhang,Jiming Wang,Guojie Zhang,Jun Liu,Ying Wang,Yuqing Zhao,Guoqiang Li
To improve the DRM reaction performance of the catalysts, a series of Co–Ni/WC-AC catalysts are prepared by impregnation using WC-AC as the support. The structural features of the fresh and spent catalysts are characterized by BET, XRD , H 2 -TPR, XPS and TG . The results show that the introduction of Ni in the 20Co/WC-AC catalyst promotes the conversion of W species to WC. Further, WC enhances the interaction between the active metal and the support. Thus, the activity and sintering resistance of Co–Ni/WC-AC catalysts are improved. It is also found that the introduction of different ratios of Ni has a significant effect on the chemical environment (oxygen environment) on the catalyst surface.10Co–10Ni/WC-AC catalysts showed high surface O α and O β contents of 26% and 53%, respectively. The catalyst shows excellent catalytic performance. The conversion of CH 4 and CO 2 is stable at about 84% and 85% at 800 °C.
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ACS Catalysis
·
2022
·
IF 13.7
Yongjun Ji,Shaomian Liu,Shaojia Song,Wenqing Xu,Liang Li,Yu Zhang,Wenxing Chen,Huifang Li,Jingang Jiang,Tingyu Zhu,Zhenxing Li,Ziyi Zhong,Dingsheng Wang,Guangwen Xu,Fabing Su
Pt-based catalysts are promising for the selective catalytic reduction of NOx by CO (CO-SCR), but some technical issues hinder their practical application, including the high Pt loading needed, high reduction temperature, and the low tolerance toward SO2. Here, we report a novel Pt catalyst for CO-SCR, which has negatively charged single-atom Pt embedded on CuO squares, and the latter is supported on CoAlO nanosheets. This Pt–CuO/CoAlO catalyst with an ultra-low Pt loading (0.02 wt %) exhibited 91% NO conversion and 80% N2 selectivity in 3% O2 at 200 °C. More importantly, it showed almost no activity loss in 200 ppm SO2 over a 15 h test. The theoretical calculations reveal that the negatively charged Pt has a stronger NO adsorption ability than the positively charged Pt, and Cu serves as the CO adsorption site. The much-weakened SO2 adsorption on Pt–CuO/CoAlO relative to the NO and CO adsorption effectively avoids the catalyst poisoning by SO2.
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Carbon Letters
·
2022
·Vol. 33
·期 2
·373-385
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IF 3.117
Lu Shuxin,Zhang Hongyu,Chai Maozhou,Yao Xiaohong,Zhang Xiangyu,Yang Yongqiang
Poor mechanical properties and bacterial infection are the main problems faced by dental restorative resins in clinical use. In this study, graphene quantum dots (GQDs) grafted with imidazole groups and mesoporous silica (MSN) are co-filled in a dental resin to impart excellent antimicrobial activity and mechanical properties to the dental resin. The higher specific surface area of GQDs and MSN results in an increased contact area with the resin matrix, which enhances the strength of the dental composite resin. The introduction of GQDs significantly improves the antimicrobial activity of the resin. The inhibition efficiency of the composite resin against Streptococcus mutans reached 99.9% with the addition of GQDs at only 0.2 wt.%. When MSN and GQDs are co-filled, MSN interferes with the release of GQDs, thus reducing the antimicrobial activity of the dental resin but improving the cyto-compatibility. By reasonably adjusting the amount of GQDs and MSN, the dental composite resin can exhibit excellent antimicrobial properties, mechanical properties and cyto-compatibility at the same time.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2022
·Vol. 103
·期 8
·3812-3821
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IF 4.125
Jing Zhang,Lulu Dong,Qianwang Zheng,Jie Xiao,Yong Cao,Yaqi Lan
BACKGROUND There is increasing interest in the development of oleogel-based emulsions. However, they usually contained surfactants for stabilization, especially small-molecular weight surfactants, which may have adverse health impacts. RESULTS Herein, a surfactant-free oleogel-based emulsion stabilized by co-assembled ceramide/lecithin (CER/LEC) crystals was developed. The formation and stabilization mechanisms were explored. The different molar ratios of gelator (LEC and CER) in emulsions resulted in different crystal morphology, crystallinity as well as different emulsion properties. This suggested that appropriate crystallinity, crystal size, and interfacial distribution of these crystals provided higher surface coverage against droplets coalescence, thus better emulsion stabilization. Both X-ray diffractograms and contact angle results confirmed that the crystals which were primarily responsible for emulsion stabilization, are co-assembled crystals consisted of both gelators (CER and LEC). Furthermore, the percentage of free fatty acids (FFAs%) results revealed a negative relationship between lipid digestibility and crystal concentration. CONCLUSIONS This strategy greatly enriched surfactant-free oleogel-based emulsion formulations, as well as their potential applications in healthy lipid-based products and novel food delivery systems with controlled lipid digestibility. © 2022 Society of Chemical Industry.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Jiying Shi,Linlin Zang,Long Zhang,Jingzhen Wang,Qing Xu,Yanhong Zhang,Liguo Sun
Porous carbon supported metal nanoparticles as supercapacitor electrode materials have attracted extensive attention. In this paper, cobalt nitrate/polystyrene microspheres/chitosan(Co(NO 3 ) 2 /PS/CS) balls were fabricated by emulsion encapsulation and self-assembly process. After carbonization, Co nanoparticles (NPs) loaded on porous ball-in-ball N-doped carbon (Co/BNC) were prepared. Co/BNCs with high surface area profit formation of sufficient active sites and facilitate ion transport due to the interconnected and interpenetrating porous carbon structure. The electrochemical performances of Co/BNCs are affected by Co NPs content and the Co/BNC with the optimal Co NPs content (Co/BNC-2) possesses a commendable specific capacitance of 1120 F g −1 at 1 A g −1 . Moreover, the capacitance retention of the asymmetric supercapacitors assembled by Co/BNC-2 and activated carbon is about 85.38 % after 5000 cycles. Remarkably, the device exhibits a maximum energy density of 60.9 Wh kg −1 at 764 W kg −1 and maintains 37.8 Wh kg −1 at 7878 W kg −1 . Co/BNCs mentioned here have the potential to be candidates for high-performance supercapacitor electrode materials.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 4
·e202200154
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IF 1.8
Chengcheng Zeng,Zongwei Yang,Jiahui Liu,Ling Ding,Shilong Hao,Feiyan Gong,Zhijian Yang
Low melting point compound MTNP was usually adopt to form co-crystal explosive with CL-20 to reduce sensitivity, and the co-crystal may have the potential of green engineering application. Improving mechanical properties of co-crystals explosive is one of the effective ways to broaden its practical application. In this work, CL-20/MTNP energetic co-crystal was selected to be coated by polydopamine (PDA) and neutral bonding agent (NBA), with enhanced mechanical properties and developed interfacial strength between crystal and binder. The TG-DSC curve showed that thermal decomposition of co-crystal explosives divided into two steps, and the melting point delayed to 210 °C compared with that of MTNP. After surface modification, the storage modulus of PBX was increased by more than 20 % at the temperature range of (25–120) °C, and creep strain was also effectively reduced. The Brazilian and compressive strength of PDA coating samples increased by 69.89 % and 210.53 % respectively, as well as improved elongation, leading to increased fracture toughness. Here, the highlighted modification on the surface of CL-20/MTNP co-crystal can be used as a reference insight to improve the mechanical properties of new explosives.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Yirong Sun,Jundong Zhong,Ziyu Lin,Ruiyin Sun,Liyuan Chen,Zhenhua Jiang,Jinhui Pang
Interfacial polymerization has always been a research hotspot for the preparation of polyamide (PA) membranes for molecular sieving. In previous reports, water-soluble amines (such as piperazine (PIP), m-phenylenediamine (MPD), etc.) were mostly used as monomers containing amino functional groups in the aqueous phase to conduct interfacial polymerization with 1,3,5-mesotribenzoyl chloride (TMC) in hexane , resulting in a dense PA film. However, this approach limits the diversity of polymer structures in PA films. To introduce water-insoluble 9,9-Bis(4-aminophenyl)fluorene (BAF) with a rigid twisted structure into interfacial polymerization, this study reports the interfacial polymerization of BAF in DMF/water solution with TMC in n-hexane. BAF-PA films with a larger free volume compared with MPD-PA were successfully prepared. The anomalous interfacial diffusion phenomenon was explained by the interfacial properties and molecular diffusion mechanism of the two-phase solvent and was confirmed by observing the microscopic morphology of the film. Since the structure of BAF-PA has a larger free volume, the BAF-PA film prepared by co-solvent interfacial polymerization has higher permeance to methanol (23.88 L m −2 h −1 bar −1 ). Meanwhile, it has more than 90% rejection of dyes with molecular weights of 585 Da and above. The large free volume PA film prepared with DMF/water mixed solvent exhibited excellent performance in organic solvent nanofiltration . This method also offers the possibility of introducing other water-insoluble amines into the interfacial polymerization to prepare PA films.
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Arabian Journal of Chemistry
·
2022
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IF 6.212
Lusheng Shi,Pengquan Yan,Zhihua Gao,Wei Huang
Due to the complexity of the structure–activity relationship of the CuAl 2 O 4 spinel catalyst, optimization of the catalyst structure is a great challenge. In this paper, three different CuAl 2 O 4 spinel catalysts were prepared by the solid-phase method using copper hydroxide, copper nitrate, and copper oxide as the copper source, respectively, to study the difference in the structure of CuAl 2 O 4 spinel catalysts induced by the raw materials and the catalytic behavior for CO hydrogenation. The structure of CuAl 2 O 4 spinel catalyst was characterized by XRD, BET, SEM, TEM, H 2 -TPR and XPS. The activity of CO hydrogenation over the CuAl 2 O 4 spinel catalyst without pre-reduction was evaluated in the slurry reactor. The results demonstrated that different copper sources had obvious influence on the CuAl 2 O 4 spinel texture properties, surface enrichment degree, as well as decomposition and reduction ability, which further regulated the ratio of Cu + /Cu 0 and thus affected the catalytic performance, especially the alcohol distribution. The CuAl 2 O 4 spinel, employing copper hydroxide as the copper source, showed better selectivity of C 2+ OH, which was assigned to a higher ratio of Cu + /Cu 0 , along with larger pore size and pore volume. Moreover, the synergistic effect between Cu 0 and γ-Al 2 O 3 improved the selectivity of dimethyl ether.
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Xijun Li,Sifan Zhang,Lihua Zhu,Jun Liu,Huan Zhang,Ning Zhao,Bing Hui Chen
Herein, a series of the Pt-based bimetallic catalysts (PtM x /SBA-15) are gained by using ultrasonic incipient wetness impregnation method (M = Co, Cu, Ni or Zn). The experimental results show that the catalytic performance (including catalytic activity (turnover frequency-TOF), selectivity to crotyl alcohol) of PtCo x /SBA-15 for catalyzing crotonaldehyde selective hydrogenation is the best among PtM x /SBA-15. Additionally, the ratio of Pt/Co in the PtCo x /SBA-15 catalysts is changed to successfully synthesize PtCo/SBA-15, PtCo 2 /SBA-15, PtCo 5 /SBA-15. It demonstrates that the selectivity of the PtCo x /SBA-15 catalysts for crotonaldehyde selective hydrogenation to crotyl alcohol is significantly improved with the increase of the Co content. The PtCo 5 /SBA-15 catalyst provides 83.8% conversion of crotonaldehyde, 94.3% selectivity to crotyl alcohol and TOF of 910.5 h −1 under mild reaction conditions (3.0 MPa H 2 , 80 °C and 2.0 h). And PtCo 5 /SBA-15 has much better catalytic performance (higher catalytic activity and selectivity to crotyl alcohol) than PtCu 5 /SBA-15, PtNi 5 /SBA-15 and PtZn 5 /SBA-15. The reasons are as follows: (1) PtCo alloy forms, which is conducive to crotonaldehyde adsorption and activation; (2) there is an appropriate synergy effect between Pt and Co, greatly improving the capacity of the catalyst activating hydrogen under mild conditions; (3) the electron transfers from Co to Pt, resulting in the increase of Pt electron density and decrease of Co electron density, then the Co sites are advantageous to C O group adsorption and activation and Pt sites for H 2 adsorbing and activating; (4) with the increase of the Co proportion in PtCo x /SBA-15, the synergy effect between Pt and Co in PtCo alloy strengthens and thus increases the selectivity of C O group hydrogenation.
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Biomaterials Advances
·
2023
·
IF 0
Lin Zhan,Xuelian Yin,Yuxi Zhang,Jiale Ju,Yinghua Wu,Lin Ding,Chenchen Li,Xuerui Chen,Yanlin Wang
Cutting off glucose provision by glucose oxidase (GOx) to famish tumors can be an assistance with chemotherapy to eliminate cancer cells. Co-encapsulation of GOx and chemotherapeutics (doxorubicin) within pH-sensitive metal-organic frameworks (MOFs) could disorder metabolic pathways of cancer cells and generate excessive intracellular reactive oxygen species (ROS), together. To prevent premature leach of GOx from the porous channels of MOFs, polydopamine (PDA) was deposited on the surface of MOFs, which endowed the delivery system with photothermal conversion ability. Our nanoscaled co-delivery system (denoted as DGZPNs) remains stable with low amount of drug leakage under simulated physiological conditions in vitro and internal environment, while they are triggered to release doxorubicin (DOX) and GOx in acid tumor microenvironment and at high temperature for reinforced chemotherapy. NIR laser irradiation also activates superior photothermal conversion efficiency of PDA (36.9 %) to initiate hyperthermia to ablate tumor tissue. After being phagocytized by 4 T1 cells (breast cancer cells), the DGZPNs delivery system showed a superior therapeutic efficacy with a tumor growth inhibition of 88.9 ± 6.6 % under NIR irradiation, which indicated that the starvation-assisted chemo-photothermal therapy prompts the significant advance of synergistic therapy in a parallelly controlled mode.
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