JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 101
·期 3
·519-528
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IF 2.606
Li Xiaohua,Yang Zichun,Shao Huilong,Li Kunfeng,Fei Zhifang
In this paper, PI-reinforced polymethylsiloxane aerogels composites were prepared by using methyltriethoxysilane (MTES) as precursor and polyimide fibers as reinforcement phase in the aqueous solvent system through acid-base two-step method and CO 2 supercritical drying method. The effects of changes in the length and content of PI fibers on the thermal, mechanical, and sound insulation properties of the aerogel composites were systematically studied. The PI fiber is tightly bonded with the flexible aerogel substrate, showing good thermal properties. The density of the prepared samples is between 0.05 and 0.20 g/cm 3 , and the thermal conductivity is between 0.021 and 0.026 W/(m K). The thermal conductivity of samples decreases with the increase of fiber length and increases with the increase of PI fiber content, and the initial thermal decomposition temperature reaches 522.1 °C. During the compression test, PI-reinforced polymethylsiloxane aerogels did not crack in the 20% deformation compression process, and the rebound rate was between 44 and 46%, which was little affected by the reinforcing phase. The maximum compressive strength was 0.023 MPa, which was 1.4 times that of the polymethylsiloxane aerogel without adding reinforcing phase. The sound insulation property of PI simple with density around 52 mg/cm 3 is mainly affected by fiber content and length change in low-frequency region, and the sound transmission loss of the sample with 3 mm and 2 wt% PI fibers reaches 18 dB at 500 Hz.
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CATALYSIS TODAY
·
2022
·
IF 6.562
Yunfei Ma,Wenhui Yue,Zehong Xu,Ziwei Ye,Jinlong Zhang
Composite nanoparticles consisting upconversion nanoparticles (β-NaYF 4 :Yb/Er) and nitrogen doped TiO 2 nanoparticles were constructed via a chemical assembly method. Efficient energy transfer was enabled since the upconverted energy matched up with the band gap of N-TiO 2 . This enables the resulting composite nanoparticles to possess excellent Rhodamine B (RhB) degradation activity under near infrared (NIR) light irradiation.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yifei Li,Jingwen Li,Ya Cao,Ping Jiang,Yuguo Tang,Zutao Chen,Kun Han
Sensitive and specific assay of hepatitis C virus (HCV) RNA has a great clinical significance for the diagnosis of hepatitis C in window period. A colorimetric assay is described for determination of the RNA of hepatitis C virus. The method is based on the in situ synthesis of graphene quantum dot-silver nano-composites (GQD/Ag NCs), magnetic separation and catalyzed hairpin assembly reaction (CHA). The silver component of GQD/Ag NCs react with H 2 O 2 generated by glucose oxidase , which are induced via CHA. Then the light-yellow solution turns into colorless transparent in the presence of the target RNAs. The method has a linear response in the 25–500 pM RNA concentration range, and the detection limit is 24.84 pM. The method is simple, stable and sensitive and might be extend to the assay of other RNA viruses . The retro-transcription free and visual distinguishable properties endow this strategy a promising application in the screening of HCV.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Peng Lin,Junpeng Shi,Liyan Ming,Yangyang Sheng,Liang Song,Maochun Hong,Yun Zhang
Hypoxia, which emerges in most solid tumors, significantly restricts therapeutic effect during treatment. To date, many smart nanoparticles that continuously generate O 2 have been developed to relieve hypoxia in tumors. Nevertheless, the short therapy duration resulting from the intrinsic properties of these nanoparticles left the subsequently generated O 2 not to be fully utilized, resulting in suboptimal treatment. Here, by loading mesopore MnO 2 (mMnO 2 ), photosensitizer and carbonic anhydrase IX inhibitor (CAI) on persistent luminescence nanoparticles (PLNPs), we designed an intelligent nanoplatform that can persistently exploit O 2 for efficient treatment of hypoxic tumors. In the tumor microenvironment, CAI is released rapidly as a result of degradation of mMnO 2 , reducing the intracellular pH value to accelerate the degradation process. This is not only advantageous for drug release and chemodynamic therapy (CDT) via released Mn 2+ , but is also beneficial for sustainably generating O 2 via composition of excessive H 2 O 2 to relieve hypoxia. With X-ray irradiation, the photosensitizer is activated by PLNPs, consuming generated O 2 to realize enhanced photodynamic therapy. Moreover, after cessation of X-ray irradiation, this process continues, achieving sustained and improved therapy for hypoxic tumors. By exploiting this method, we propose a new treatment methodology for hypoxic tumors.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Jiahui Lu,Nan Sheng,Chunyu Zhu
Phase change materials (PCMs) using metals/alloys have been concerned for medium temperature solar thermal storage and waste heat recovery. However, the PCMs may leak due to the solid-liquid phase change, which greatly limits the use of metallic PCMs. In this study, we report the synthesis of microencapsulated PCMs (MEPCMs) using metallic Sn as PCM core and a sol-gel coated SiO 2 as shell. The as-coated microcapsules are further undergone a high temperature heat treatment at oxygen/nitrogen atmosphere. Due to the self-repairing effect, the cracked microcapsules can be sealed and stabilized, thereby forming high stabilized MEPCMs over 100 cycles. The melting point and latent heat of the Sn@SiO 2 –O 2 microcapsules were around 233 °C and 56 J g -1 respectively, while the values were around 233 °C and 58 J g -1 for Sn@SiO 2 –N 2 microcapsules, similar to the theoretical values of metallic Sn. The successfully prepared Sn@SiO 2 MEPCMs could find wide applications in medium temperature thermal energy storage .
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2022
·
IF 2.712
Lumin Li,Xiaofeng Ji,Kai Chen
The rapid development of flexible electronic technology has led to the in-depth study of flexible wearable sensors to achieve accurate sensing under different external stimuli. However, it is still a huge challenge to develop hydrogel-based wearable skin-like sensors with super ductility, high sensitivity, and self-healing properties. Herein, the Ti3C2 type of MXene was synthesized, and the Ag/MXene nanocomplexes were incorporated into polyvinyl alcohol-borax matrix to construct a novel composite hydrogel as the multifunctional nanofillers, which could bring both improved properties and novel functionalities. The Ag/MXene-Poly (vinyl alcohol) (PVA) hydrogel displayed integrated merits of highly strain sensitive (GF = 3.26), self-healing (within 10 min, 91% healing efficiency), and excellent antibacterial activity. The hydrogel could be assembled into a wearable skin-like sensor to monitor human movement, including large deformations (finger, elbow, wrist, and knee bending) and tiny deformations (mouth’s movement and throat vocalization) in real time. Therefore, this work shed a new light on the development of flexible wearable skin-like sensors for the personalized healthcare monitoring, human–machine interfaces, and artificial intelligence.
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Energy Storage Materials
·
2022
·
IF 20.831
Dongli Chen,Tao Zhu,Ming Zhu,Siqi Yuan,Peibin Kang,Wenxi Cui,Jinle Lan,Xiaoping Yang,Gang Sui
The lifetime and safety of lithium metal batteries (LMBs) with commercial polyolefin separators and liquid electrolytes are deteriorated by the lithium dendrites, as well as leakage and combustion of liquid electrolytes. To effectively address these issues, a “ceramer” electrolyte is in-situ synthesized to exquisitely combine meritorious properties of both cera mic silica (e.g. high modulus) and poly mer poly-1,3-dioxolane (e.g. flexibility/good interface with electrodes), leading to excellent performance for the LMBs. The lithium anodes with the novel “ceramer” electrolyte exhibit ultra-long cycle life and lithium dendrite-free property that is confirmed by in-situ optical microscope. The Li/Li symmetric cells stably plat and strip for up to 3,600 h at 0.5 mA cm −2 with a constant low overpotential. The LiFePO 4 /Li cells present up to 90.3% capacity retention and 99.9% coulombic efficiency at 1 C after 500 cycles. Even at a higher current density of 2 C, the cell performs an excellent long-term cycle stability with a capacity decay of only 0.0285% per cycle. More significantly, the assembled coin cells (LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Li) delivers high capacity retention of 80.2% at 1 C after 500 cycles, and the pouch cell with high cathode loading (10 mg cm −2 ) and thin lithium anode (∼50 µm) is operated stably. This research provides a very promising strategy to construct a unique organic-inorganic electrolyte with excellent comprehensive properties effectively enabling long-cycle and high-safety LMBs.
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JOURNAL OF SEPARATION SCIENCE
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2022
·Vol. 45
·期 23
·4224-4235
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IF 3.614
Ruozhu Xu,Yuan Tao,Wang Yao,Honglin Qin,Lizhen Qiao
In this study, three-dimensional flower-like tin disulfide materials were prepared, and a highly efficient dispersive solid-phase extraction method was developed using the obtained three-dimensional tin disulfide adsorbents for the preconcentration and determination of six endocrine-disrupting phenols in combination with high-performance liquid chromatography-ultraviolet detection. Several important experimental parameters influencing extraction efficiency were investigated, including the amount of adsorbent, ultrasound time, sample solution pH, sample volume, type of elution solvent, desorption time, and the number of desorption times. Under the optimized experimental conditions, the developed method showed good linearity with the determination coefficients of 0.993–0.998 in the linear range of 0.5–400 ng/ml and low limits of detection in the range of 0.15–1.0 ng/ml, as well as satisfactory intra-day and inter-day precisions with relative standard deviations of 0.1–9.8%. Finally, the proposed method was successfully applied for the enrichment and determination of trace endocrine-disrupting phenols in milk, tea beverage, and plastic bottled water samples, and acceptable recoveries were obtained from 70.1% to 119.1% under four different spiked concentration levels. The results showed that the three-dimensional tin disulfide materials had great potential for the extraction of endocrine-disrupting phenols contaminants in environmental and food samples.
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RARE METALS
·
2022
·Vol. 41
·期 12
·4127-4137
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IF 6.318
Ren Xiao-Zhen,Li Xue-Hui,Peng Yu-Jie,Wang Guan-Zhi,Yin Jie,Zhao Xing-Chuan,Wang Wei,Wang Xiao-Bai
It is critical to developing electrocatalysts with highly active and cost-effective for oxygen evolution to resolve environmental pollution and energy issues, in which FeNi-based nanomaterials hold a great promise. Herein, (Fe 0.33 Ni 0.67 )S 2 and (Fe 0.33 Ni 0.67 )S 2 /reduced graphene oxide (rGO)- x % ( x = 10, 20) composites, which exhibited highly efficient oxygen evolution reaction (OER) electrocatalytic activity under alkaline conditions, were synthesized via a hydrothermal approach and following thermal treatment with sulfur powders. Benefiting from the integrated structure of (Fe 0.33 Ni 0.67 )S 2 and support of conductive graphene backbones, (Fe 0.33 Ni 0.67 )S 2 /rGO-20% electrocatalyst showed the best OER activity with an overpotential of 172 mV at 10 mA·cm −2 and Tafel slopes of 45 mV·decade −1 . The composition, phase, and surface structure of the catalyst were characterized before and after OER reaction. The results indicated that crystal phase of the catalyst was reconstructed to the amorphous crystalline features after OER, with oxidation of iron-nickel sulfide and appearance of Ni–Fe oxo/hydroxide species, which may play a crucial role in the high OER performance as the catalytic-active. Moreover, in a two-electrode system towards overall water splitting with (Fe 0.33 Ni 0.67 )S 2 /rGO-20%/NF and Pt/C/NF as the anode and cathode, respectively, the catalysts exhibited excellent catalytic performance with the voltage of only 1.42 V at 10 mA·cm −2 . Graphical abstract
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ACS Catalysis
·
2022
·
IF 13.7
Rui Ma,Junxian Gao,Jiajing Kou,David P. Dean,Christian J. Breckner,Kaijun Liang,Bo Zhou,Jeffrey T. Miller,Guojun Zou
Nickel has been considered a promising nonprecious metal for propane dehydrogenation (PDH) because of its appealing ability to activate alkane molecules; however, synthesis of selective and stable Ni sites remains a challenge. Herein, we describe an alumina-supported isolated Ni(II) site by settling Ni2+ cations into Al3+ vacancy on γ-Al2O3 as a selective and stable Ni-based catalyst for PDH. Based on the results from combined characterizations, including in situ X-ray adsorption spectroscopy (XAS), scanning transmission electron microscopy (STEM), and in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS), atomically dispersed Ni(II) sites with bonding to oxygen ions from the alumina support are demonstrated. PDH catalyst tests shows that the Ni(II) single-site catalyst delivers superior performance compared to a supported metallic Ni NP catalyst, possessing >93% propylene selectivity at considerable propane conversions (15–45%), which surpasses Ni nanoparticle (NP) catalysts. The correlation of selectivity to propylene on different Ni structures with the structural characterizations suggest that the coordinatively unsaturated tetrahedral Ni(II) sites facilitate the desorption of propylene, which inhibits the side reactions for coking. Moreover, the atomically dispersed Ni(II) sites remain in its local structure in the reaction-regeneration cycles, as evidenced by in situ XAS. This study on alumina-supported nickel catalysts affords insights into the nature of selective and stable nickel sites involved in the PDH reaction.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Jiajia Chen,Xinyu Lu,Dandan Wang,Pengcheng Xiu,Xiaoli Gu
Lignin is the world's greatest renewable aromatic biofeedstock, and it has promising applications in high value-added chemical products. Herein, N-Co/ATP-CZO was used as a catalyst for the depolymerization of alkali lignin in ethanol and isopropanol systems, and explored the effects of formic acid (FA) amount, reaction time, reaction temperature and other factors on the depolymerization of alkali lignin. Among them, formic acid serves as both catalytic and in situ-hydrogen donor. Ultimately, the highest yield of bio-oil (59.28% (mass)), including 30.05% (mass) of monomer , was obtained after a reaction of FA to alkali lignin mass ratio of 4 and 240 °C for 8 h. Among the monomers, the yield of Guaiacol was the highest (5.94% (mass)), followed by 2-methoxy-4-methylphenol (5.74% (mass)). This study, the modification of attapulgite was carried out to reduce the acidity while enhancing the catalytic activity for depolymerization, and the selection of hydrogen donor was investigated. A feasible pathway for lignin depolymerization research was opened.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 41
·15889-15902
·
IF 4.569
Xiaotong Lu,Shengnan Li,Chengyao Zhao,Yujing Liu,Zhongqiu Liu,Anguo Ying
Core–shell-like structured polymeric ionic liquid hybrid nanoreactors with “internal hydrophobic–external hydrophilic” characteristics were successfully synthesized through the Stöber method and reversible addition–fragmentation chain transfer (RAFT) polymerization. Firstly, we introduced hydrophobic organosilicon as an inner core and fixed Pd nanoparticles (∼0.69 mmol g−1) in the pore and finally constructed a hydrophilic shell, which not only ensured the dispersity of the catalyst in water but also effectively prevented the leaching of Pd species. The structure and properties of nMIE@Pd/SiNP-CPDB were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, ICP-OES, thermogravimetric analysis (TGA) and ultraviolet and visible spectrophotometry (UV-vis) characterization methods. The adsorption enthalpy of the best catalyst for styrene was calculated using the Clausius–Clapeyron equation and the value was −12.765 kJ mol−1, which strongly verified that the prepared catalyst could effectively promote mass transfer and the adsorption of reactants or products. Furthermore, the as-prepared nanoreactors exhibit distinguished catalytic activity for aqueous hydrogenation reactions and even after 7 cycles, the catalysts still maintain their superior catalytic activity, showing almost no leaching of palladium species.
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