Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 40
·14139-14145
·
IF 7.393
Yuxuan Zhang,Xue Zhao,Jianhang Yuan,Xialei An,Xuefang Sun,Jie Yi,Xi-Ming Song
The research on the photomechanical effects of azobenzene-containing high performance polymer materials has received much attention due to their potential applications in high temperature environments. At present, there are few types of photoinduced deformable polymers based on azobenzene-containing high performance polymers, and their photoinduced deformation rates need to be improved. In this paper, a novel series of azobenzene-containing poly(arylene ether)s with various contents of binaphthalene groups were synthesized. Introducing binaphthalene groups into azobenzene-containing poly(arylene ether)s was a helpful strategy to increase the free volume, which could increase the photoinduced deformation rates of the polymers. Under 442 nm unpolarized laser irradiation, the photoinduced deformation rates increased with the contents of binaphthalene groups of the polymers. Under 442 nm polarized laser irradiation, the cantilevers of the azobenzene-containing poly(arylene ether)s have shown unusual photoinduced deformation behavior. When the polarization direction of the polarized laser was perpendicular to the long axis of the cantilevers of the polymers, the cantilevers bent away from the excitation laser at the beginning, then bent towards the excitation laser and could reach the initial position. The angles of the polymers bent away from the excitation laser increased with the contents of binaphthalene groups of the polymers. The photoinduced deformation behavior of the polymers could be adjusted by adjusting the polarization direction of the polarized laser, the laser power and the thickness of the cantilevers of the polymer. This interesting phenomenon has not been reported in previous research on the photoinduced deformation behavior of azobenzene-containing high performance polymers.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 18
·2100971
·
IF 6.147
Saqib Nawaz Khan,Sijie Ge,Ening Gu,Santhosh Kumar Karunakaran,Wentao Yang,Ruijiang Hong,Yaohua Mai,Xianzhong Lin,Guowei Yang
The use of transparent conducting oxides (TCO) as a back contact for Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cell enables light absorption from both front and rear sides and allows for the fabrication of semi-transparent photovoltaic devices. However, the CZTSSe solar cell based on TCO substrate suffers from high parasitic losses owing to the long post-annealing time at elevated temperature required for high-quality absorber. This work aims to overcome this issue by carefully tailoring the annealing conditions to obtain high-performance solar cell. Rapid thermal processing is used to instantaneously generate high Se vapor pressure at target temperature and shorten the annealing time. The crystalline quality, morphology, and particularly the photovoltaic performance of the resulting CZTSSe thin film are systematically investigated. It is found that the increase of annealing temperature and time improves the crystalline quality but unfortunately deteriorates the device performance owing to increasing parasitic losses. Increasing the amount of Se allows to get highly crystalline absorber within 7 min of annealing, yielding a total area 5.56% efficient CZTSSe solar cell with front illumination resulting from reducing parasitic losses. This work provides a simple approach to preserve the back contact without using a complex interfacial layer.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xuedong Du,Wenyang Fu,Pei Su,Qizhan Zhang,Minghua Zhou
The reduced S-modified MIL-53(Fe) was prepared by sulfurizing MIL-53(Fe) at low temperature, which was an efficient electro-Fenton catalyst at wide pH range (3–9) for sulfamethazine (SMT) degradation. The best temperature and MIL-53(Fe)/S ratio were 350 °C and 1:2, at which the BET surface area was much enlarged. The MIL-53(Fe) surface was etched by S to many 2D nanosheets with the thickness of ~50 nm, while S 2–2 replaced OH - to coordinate with Fe 2+ and increased the Fe 2+ content, which improved the catalytic performance. Even at initial pH of 7.0, the SMT removal was 95.8%, and the rate constant ( k ) in the Hetero-EF process was 16-folds of that in the Homo-EF process. The turnover frequency (TOF d ) value of MIL-53(Fe)/S(1:2)−350 was 0.48 L g −1 min −1 , which was 6.8 times that of commercial FeS 2 . The S 2–2 in catalyst adjusted the pH superfast, and promoted the generation of Fe 2+ and thus efficiently activating H 2 O 2 to form surface · OH, which was verified to be the main radical by EPR and radical scavenger experiments. This catalyst showed promising prospect for environmental application and could be regenerated by sulfidation method. S-doped MIL-53(Fe) was an excellent pH regulator, thus promoting promising application in Hetero-EF processes.
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POLYMER JOURNAL
·
2021
·Vol. 54
·期 1
·47-55
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IF 3.08
Jiao Danhua,Cai Xiaodong,Song Qun,Zhou Ruiqun,Peng Xiao,Bao Dongmei
A series of aliphatic poly(carbonate-co-ester)s (PBCFs) were successfully synthesized via melt polycondensation of 1,4-butanediol (BD) and dimethyl carbonate (DMC) in the presence of biobased fumaric acid (FA). The prepared unsaturated copolymers had weight-average molecular weights ( M w ) in the 4.98 × 10 4 to 8.82 × 10 4 g·mol −1 range and from 1.56 to 1.83 polydispersities. They all had random microstructures. The physical properties of the novel poly(carbonate-co-ester)s, such as melting temperature ( T m ) and melting enthalpy ( ∆H m ), varied widely depending on their composition. The stiff fumaric acid units in the poly(butylene carbonate) (PBC) chain caused an increase in the glass transition temperature ( T g ) and thermal stability. Furthermore, PBCF10 to PBCF20 (with fumaric acid unit content of <19%) contained PBC crystals, while the lattice structure of PBCF40 to PBCF80 (with fumaric acid unit content greater than 37%) was similar to that of the poly(butylene fumarate) (PBF) type. The mechanical properties and biodegradability of the copolymers were also studied.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 45
·16795-16802
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IF 4.39
Su-Yun Zhang,Fangchao Long,Chenxu Kang,Zhengyuan Jin,Ailun Zhao,Huawei Liang,Shuangchen Ruan,Yu-Jia Zeng
γ-phase copper(I) iodide (abbreviated to CuI hereafter) with different morphologies is realized through a one-step redox process from I-containing ionic liquid (IL) or poly(ionic liquid)s (PILs) precursors at room temperature. The phase composition, morphology, and electronic states of the synthesized CuI samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The resulting CuI products exhibit three different types of morphologies, namely nanocrystals, with an average size of 0.8 ± 0.2 μm, nanoplates, with a thickness of 35.8 ± 0.9 nm, and nanoflowers, with petals with a thickness of 12.2 ± 0.8 nm. Moreover, the as-synthesized CuI samples exhibit gradually diminishing bandgaps and improved photocatalysis performance for the photodegradation of rhodamine B (RhB) under visible light irradiation as the thickness decreases. XPS measurements confirm that IL/PILs coupled to the CuI surface, resulting in a further charge transfer between Cu and I. These results conclusively prove that IL/PILs serve as both the reducing agents and assemble as orientation templates in the formation of the CuI nanostructures, and also successfully mediate the functional properties of the samples by changing the surface electronic structures.
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Biomaterials Science
·
2021
·Vol. 9
·期 13
·4765-4777
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IF 6.843
Shu Li,Chen Guo,Xingjiao Zhang,Xiaojing Liu,Jing Mu,Chunxia Liu,Yali Peng,Min Chang
Anxiety disorders are the most common mental diseases and can greatly disrupt everyday life. Although there has been substantial research on anxiety disorders, novel therapeutics are needed. Neuropeptide S (NPS) is a potential therapeutic candidate owing to its strong anxiolytic activity; however, some disadvantages, such as its poor metabolic stability and inability to cross the blood–brain barrier (BBB), limit its use in the clinic. Herein, inspired by nose-to-brain drug delivery strategies, an endogenous 20-amino-acid-long mNPS peptide was modified by incorporating palmitic acid into its functional Lys12 side chain (M-3), which was expected to facilitate nose-to-brain penetration and exert a prolonged anxiolytic-like effect compared to mNPS. We found that M-3 assembled into nanofibers that retained the bioactivity of NPS and exhibited obvious improvements in metabolic stability. Notably, as expected, self-assembled M-3 was able to penetrate into the brain and exert anxiolytic effects. The elevated plus-maze (EPM) results further revealed that M-3 could produce prolonged anxiolytic-like effects in mice. In vivo imaging studies revealed that self-assembled M-3 could be efficiently transported from the nasal cavity to the brain. Furthermore, when intranasally administered, this molecule exhibited a significantly prolonged anxiolytic-like effect, which further illustrated that this molecule has a potent nose-to-brain penetration in vivo. Overall, this self-assembled nanofiber showed potent nose-to-brain penetration ability and prolonged bioactivity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hong Li,Xinzhu Wen,Feng Shao,Shiwei Xu,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Rational materials design is critical to develop advanced electrodes for high-performance sodium-ion battery. In this work, a well-designed structure with interlayer-expanded molybdenum disulfide (MoS 2 ) vertically anchored on graphene substrates (v-MoS 2 /rGO) is achieved by one-pot hydrothermal synthesis . The vertical anchored MoS 2 and high conductivity graphene sheets provide a good path for electrons/ion transfer. More importantly, the direct linkage of O from functional group on graphene oxide (GO) with edge S of MoS 2 (C-O-S) is constructed, which can maintain the stability of the v-MoS 2 /rGO electrode and enhance its electrons transport rate for the high-rate performance and long cycle life. The assembled sodium-ion battery shows high rate performance (129.2 mAh g −1 at 10 A g −1 ) and long cycling stability (251.2 mAh g ‐1 −1 at 2 A g −1 after 1000 cycles with an ultra-low degradation of 10.9 μAh g −1 per cycle). The excellent performance makes the designed structure a fascinating anode for sodium battery.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Qiao He,Qingyun Wu,Xuxu Wang,Shuting Fu,Senchuan Huang,Shengfu Tong,Yangfei Cao,Zheng Liu,Mingmei Wu
Silicon is one of the most promising candidates for anode materials for next-generation lithium-ion batteries due to its high theoretical capacity. However, the catastrophic volume change upon lithiation/delithiation and the subsequent pulverization result in poor electrochemical performance and hinder its applications. To address this issue, a Si@N,S-doped carbon core–shell structure (Si@NSC) is proposed in this work. The composites are prepared by in situ polymerization and pyrolysis. The as-prepared Si@NSC electrode exhibits a stable capacity of 1720 mAh g–1 at 0.3 A g–1 after 550 cycles with a capacity retention of 90.2%. Compared with commercial silicon and a mixture of Si and C, Si@NSC demonstrates high initial efficiency and superior cyclic stability owing to its unique structure and moderate Si/C ratio. The Si@NSC composites shed light on the application of Si-based anode materials for high-capacity lithium storage.
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Molecular Catalysis
·
2021
·
IF 5.062
Qun Li,Tingting Huang,Zichen Zhang,Meng Xiao,Hengjun Gai,Yu Zhou,Hongbing Song
Carbon dioxide (CO 2 ) emissions from the burning of fossil fuels have seriously aggravated the global greenhouse effect, leading to extreme environmental problems. Thus, the sufficient and effective use of CO 2 resources has always been an urgent issue. Herein, dication poly(ionic liquid)s (PILs)-supported palladium nanoparticles (Pd NPs) were designed to catalyze the hydrogenation of CO 2 to formic acid (FA) under mild conditions. The prepared catalysts were characterized by FT-IR, ICP, SEM, TEM, XPS, and other techniques. Results indicate that due to the strong metal-support interactions in the resultant catalysts, PILs are constructed by the IL units comprising dications and hydrophobic anions (bis(trifluoromethanesulfonyl)amide, Tf 2 N − ) that can uniformly disperse Pd NPs and enhance the catalytic hydrogenation of CO 2 to FA. The effect of various factors on CO 2 conversion is also investigated. Turnover frequency (TOF) can reach as high as 13.32 s −1 when using 1%Pd/PIL-2-Tf 2 N as a catalyst under the conditions of 80 °C, 1 h, 2 MPa pressure of CO 2 , and 0.88 M sodium borohydride aqueous solution, and the maximum amount of the obtained FA can reach up to 82% of the theoretical value. A possible mechanism of catalytic hydrogenation of CO 2 to FA is proposed according to the product analysis. This study highlights that PIL, as support, can promote the catalytic performance, and the resulting catalyst has potential application value for the CO 2 industry.
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WATER RESEARCH
·
2021
·
IF 11.236
Ziyu Zhang,Xiaoyan Huang,Jie Ma,Zhiguo Pei,Lei Luo,Xin Ke,Fei Qin,Yingming Li,Ruiqiang Yang,Ying Zhu,Qinghua Zhang
An environmentally friendly and efficient catalyst is important for the persulfate activation and pollutants removal from water. In this study, nano-graphite (NG) prepared by detonation method, was firstly applied as the superb carbon catalyst to activate peroxydisulfate (PDS) for the degradation of bisphenol S (BPS) via a non-radical pathway. Results showed that NG had a very high catalytic performance and degraded most of BPS within 20.0 min, out-performing many popular metal-based catalysts. The doped N atoms (i.e. graphitic N and pyridinic N) in NG were identified as the possible reactive sites for the PDS activation. It is proposed that PDS could form the metastable surface-bound PDS complexes on the NG surface, which promoted the BPS degradation. The NG/PDS system had a strong anti-interference ability for the environmental background substances and a wide operative pH range, so it had a good application prospect in the actual wastewater environment. This study not only provides an efficient method for the removal of bisphenol pollutants, but also deepens the insight into the reaction mechanisms.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Qiang Huang,Yu Tao,Huichang Li,Lihua Guo,Liye Wang,Chunlan Ban,Guopeng Shen
In this study, The solubility of (R,S)-mandelic acid in different solvents, including mono-solvent (H 2 O, methanol, ethanol, n-propanol, isopropanol) and binary solvents (methanol + H 2 O, ethanol + H 2 O, n-propanol + H 2 O, isopropanol + H 2 O, n-butanol + H 2 O), using analytical stirred-flask method and weight analysis method to determine the compositions of the saturated solutions at the atmospheric pressure. We found that the experimental solubility values increased with the rising of temperature accordingly. The experimental solubilities were correlated by the Ideal model, Apelblat model, λh (Buchowski) model, Wilson model, NRTL model. The results have shown that the Wilson model is the best model, which correlates the solubility of (R, S)-mandelic acid in the mono-solvent and binary solvents and fits well with experimental data. In addition, the thermodynamic properties of dissolution were calculated according to Van’t Hoff equation and experimental solubility, including Gibbs energy, entropy and enthalpy. The result confirms that the dissolution process in all solvents is always endothermic and entropy driven.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 16
·50263
·
IF 2.52
Shengsong Dai,Xuejun Yu,Rui Chen,Hong Zhou,Zhiquan Pan
An epoxy resin (EP) with excellent fire retardancy, good transparency, and satisfactory thermal stability has been obtained by introducing a new N/P/S containing flame retardant (HBD) into EP composites. When the phosphorus content was 0.48 wt%, EP/HBD reached V-0 rating with the limiting oxygen index of 33.5%. The cone calorimeter test (CC) indicated that the incorporation of HBD resulted in 1.5 times increase in ignition time, a 50% decrease in the maximum of heat release rates, 40% reduction of total heat release, and 50.7% decrease in total smoke production compared with EP. Besides, the fire-resistant behavior of EP/8% HBD is much better than the EP materials modified by similar P/N/S flame retardants reported in literature. The fire-retardant mechanism of HBD on EP was also analyzed by Raman, scanning electron microscope, Py-GC/MS, and Fourier transform infrared spectroscopy. The results show that HBD plays an important role in the formation of a dense intumescent carbon layer and gas phase quenching.
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