MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Weina Shi,Yanqing Zhu,Cong Shen,Jifu Shi,Gang Xu,Xiudi Xiao,Runqiang Cao
Thermochemical heat storage based on inorganic salt hydrates is a promising approach to relieve the heat energy supply and demand conflicts, but there exist lots of defects of pure salts when applied to the thermochemical. This paper attempted to use functionalized Metal-Organic Frameworks (MOFs) as the porous matrices to improve the heat storage performance of inorganic salt hydrates. A series of MOFs/CaCl 2 composites based on MIL-101(Cr)-X (X = -NH 2 , –SO 3 H, H, –CH 3 , –F) were successfully synthesized and fully characterized by combining multiple techniques (i.e. powder X-ray diffraction, scanning electron microscopy , energy-dispersive X-ray analysis, N 2 adsorption-desorption, Fourier transform infrared spectroscopy , thermogravimetric and differential scanning calorimetry). The water sorption properties of the series of MOFs/CaCl 2 composites were studied during the hydration process, and a continuous adsorption/desorption experiment was also performed to investigate the cycle stability of the MOFs/CaCl 2 composites. The results show that the hydrophilic MOFs based composites have higher water sorption capacity (0.6 g(H 2 O)/g(sample) for MIL-101(Cr)–SO 3 H/CaCl 2 ) accompanied with higher heat storage density (1274 J/g for MIL-101(Cr)–SO 3 H/CaCl 2 ). Moreover, the series of MOFs all presented excellent cycle performance with little loss after continuous 17 adsorption/desorption cycles.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Shaoxia Guo,Mengting Li,Liang Gao,Yongrui Wang,Cheng Gu,Longxiao Yang,Yuping Huang,Enhui Xing,Yibin Luo,Xinbin Ma,Xingtian Shu
A series of heterogeneous Pd-catalysts was prepared via a facile new method. • Use of zeolite on EMC in C 2 mixture greatly reduced the corrosiveness of system. • The H-Beta zeolite catalyst with SiO 2 /Al 2 O 3 ratio of 22 showed superior performance. • The cooperation of H-Beta and trace MSA in presence of H 2 O boosted C 2 H 4 conversion. • A possible reaction mechanism was proposed for heterogeneous Pd-based system. Ethylene methoxycarbonylation (EMC) is highly efficient route for converting ethylene to methyl propionate (MP) with 100% atom economy, which has been commercialized over homogeneous Pd-based catalyst in pure ethylene. However, concerns about severe corrosiveness of strong liquid acids have always existed. Herein, H-Beta zeolite for the first time was introduced to cooperate with trace methanesulfonic acid (MSA) in the presence of water, to catalyze EMC in C 2 mixture. Over WMB-22 catalyst (containing H-Beta zeolite with SiO 2 /Al 2 O 3 ratio of 22, 0.32 wt% H 2 O, 0.005 wt% MSA, palladium/1,2-bis(di- tert -butylphosphinomethyl) benzene (d t bpx) complex with Pd/d t bpx/MSA ratio of 1/2/0.5), a superior ethylene conversion of 97.9% and 100% product selectivity, were obtained with C 2 H 6 /C 2 H 4 /CO feeding ratio of 1/2/2. A good linear correlation between C 2 H 4 conversions and the total acid content of H-Beta zeolite and MSA revealed that the synergistic effect between H-Beta zeolite and MSA could enhance C 2 H 4 conversion. Compared with the homogeneous catalyst with Pd/d t bpx/MSA of 1/2/15, under similar C 2 H 4 conversion conditions, the MSA amount of heterogeneous system was 1/30 of homogeneous system, indicating the addition of zeolite could greatly reduce the corrosiveness of system. 31 P nuclear magnetic resonance (NMR) results indicated that the introduction of zeolite, water and MSA could promote the generation and stabilization of active species. 1 H magic angle spinning (MAS) NMR and isotope D-tracing experiments clarified the interaction among Brønsted acid of zeolite, water and methanol, confirming the proposed mechanism pathways. This work provides a facile new method for using H-Beta zeolite and MSA as potential high-performance acid promoters for EMC. Download: Download high-res image (136KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Shuai Huang,Ziqiang Xiang,Yuhao Zhu,Renfeng Gong,Yicheng Wang,Ruoyi Liu,Guanjun Liu,Qingshan Wu
The rapid evolution of high-power flexible electronics necessitates materials that concurrently enable efficient heat dissipation and high-precision thermal monitoring. Conventional ionogels suffer from intrinsically low thermal conductivity, which induces severe thermal hysteresis, fundamentally compromising their accuracy in dynamic thermal detection. Herein, rather than treating copolymer regulation or h-BN filling as isolated design elements, we propose a thermally coupled ionogel design aimed at reconciling two usually conflicting requirements: rapid heat equilibration and high thermoresistive sensitivity. P(DMAA-co-AAM)/h-BN composite ionogels are fabricated via in-situ UV-initiated free-radical polymerization, in which N,N-dimethylacrylamide (DMAA) and acrylamide (AAM) form a mechanically compliant and ion-transportable copolymer network, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) provides thermally activated ionic pathways, and hexagonal boron nitride (h-BN) nanosheets introduce filler-assisted thermal transport pathways. Systematic optimization reveals that a DMAA-to-AAM mass ratio of 3:1 with 20 wt% h-BN yields the optimal synergy among mechanical flexibility, thermal transport, and ionic conduction. The resulting composite achieves a thermal conductivity of 0.469 W/(m·K), representing a ∼160% enhancement over the pristine matrix, which effectively suppresses heat accumulation. Concurrently, the ionogel exhibits an ultra-high temperature coefficient of resistance (TCR) of −13.5%/°C and a thermosensitive coefficient (B value) of 3879 K within 0-20°C. Benefiting from the enhanced thermal transport performance, the dynamic thermal response speed of this series of ionogel sensors (30°C → 35°C) is significantly accelerated with the increase of h-BN loading: the T90 response time of the 10 wt%, 20 wt%, and 30 wt% h-BN samples is 32.40 s, 24.34 s, and 15.14 s respectively. Meanwhile, the devices can still maintain stable and reversible resistance switching characteristics over 50 heating-cooling cycles. This study achieves the synergistic enhancement of the thermal management and temperature sensing performance of the ionogel, providing an ideal material platform for the next-generation wearable electronic devices and intelligent thermal management systems.
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
W. Sun,B. Shi,Z. Xia,C. Lü
Organic room-temperature phosphorescence (RTP) materials are very attractive, but there is still a challenge to achieve RTP for their practical applications under visible light excitation (λ > 400 nm) because of the implement for the most organic RTP is under ultraviolet light. Herein, a simple tactics for inhibiting the vibrational dissipation of three amorphous phenanthroline derivatives by doping them into polyvinyl alcohol (PVA) matrix was utilized to afford visible-light excitation RTP. By using this method, on account of the mutual H-bonding and confinement effect with PVA matrix, a series of organic RTP materials with blue-green phosphorescence emission were obtained under visible-light excitation. The afterglow colors of RTP materials can be adjusted by co-doping the available fluorescence dyes (RhB or Rh6G) into the PVA films through a triplet-to-singlet Förster resonance energy transfer. However, the H-bonding is easily broken by water molecules resulting in the RTP phenomenon disappears. Hence, Aphen-epoxy resin composite system was constructed to overcome this drawback. It is shown that the composite still has good phosphorescence properties after soaking in water for 7 days. The superior RTP of the amorphous phenanthroline derivatives in processable polymer matrices endows these materials with a highly potential for the night warning clothing coating and information encryption.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Xinyu Li,Shunyu Han,Jingzhe Xu,Nanzhe Jiang
The synthesis of zeolites from natural aluminosilicate minerals is environmentally sustainable. However, the preparation of nano-ZSM-5 zeolite single crystals via the facile “silica–alumina homologation” of natural clay remains challenging. This paper highlights a novel strategy for the synthesis of defect-free, highly crystalline nano-H-ZSM-5 with a uniform morphology through the kinetically controlled in situ reconstruction of the topology of natural clay within a solid-state-like system. Crystal nucleation and growth were decoupled by aging to control the crystal size. The “homogeneous silica–alumina” property of natural clay was found to be directly inherited by nano-H-ZSM-5 to provide uniformly distributed acidic sites for catalysis. This was demonstrated by methanol-to-propylene conversion, wherein the performance of the obtained crystals was superior to that of commercial ZSM-5. This strategy promotes the development of natural silica–aluminate clay resources and allows the scalable production of high-quality nano-H-ZSM-5 single crystals for heterogeneous catalysis .
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruxia Song,Shihong Zhang,Yi He,Bo Liu,Hongjie Li,Zhifei Zhang,Yahui He
In this study, a novel Ni-Cu/OH-BN(h)-PA-Zn-DCD composite coatings with excellent wear resistance and corrosion resistance was developed, which may be used in the field of seawater corrosion. By the self-assembling of phytic acid, Zn 2+ and dicyandiamide to grow PA-Zn-DCD structure onto the surface of hydroxylated BN(h) nanosheets, obtained a hybrid denoted as OH-BN(h)-PA-Zn-DCD, which was doped into Ni-Cu coating by pulse electrodeposition. The results show that OH-BN(h) and OH-BN(h)-PA-Zn-DCD hybrids affect the surface morphology, roughness, microcrystals size and thickness of the composite coatings. Simultaneously, compared with NC coating and NC/HB-1.5 coating, NC/BP-1.5 coating has the highest microhardness (559.26 Hv), the lowest friction coefficient (0.172), and the best corrosion resistance (i corr is 3.551 × 10 −8 A·cm −2 , R ct is 1.098 × 10 6 Ω·cm 2 ). In addition, the EIS results of the immersed specimens showed that the NC/BP-1.5 composite coating still has good protective ability after soaking for 15 days in simulated seawater medium (R ct is 7.434 × 10 6 Ω·cm 2 ).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Kunyu Chen,Zhanguo Cui,Zhiqiang Zhang,Heliang Pang,Jing Yang,Xiaojiang Huang,Jinsuo Lu
The present study developed a prolonged oxidizable sulfur(IV)/ferrate(VI) system for the generation of hydroxyl radical ( OH) and sulfate radical (SO 4 − ) within 120 min, and proposed a reaction mechanism. In the presence of H + in solution, the S(IV)/Fe(IV) system provided excellent oxidation performance of refractory organics O,O-dimethyl-S-methylcarbamoyl methyl phosphorothioate (dimethoate, a widely used organophosphorus pesticide) within 120 min. The degradation efficiency of dimethoate in the bisulfite/Fe(VI) system (e.g., 90.06% dimethoate) was higher than that in the sulfite/Fe(VI) system (e.g., 51.03% dimethoate), while Fe(VI) alone degraded 27.81% of dimethoate. In the S(IV)/Fe(VI) system, the active species consisted of Fe(VI) (including the highly-reactive iron-based intermediate species, i.e. Fe(V) and Fe(IV)), OH and SO 4 − , with OH being identified as the main active species, contributing more than half of the total. The degradation mechanism of dimethoate in the S(IV)/Fe(VI) system mainly included the cleavage of the S-P bond, C-S bond and the oxidation of the P = S bond. Two plausible degradation pathways were proposed based on the detected transformation products. Dimethoate could be efficiently degraded when the [bisulfite]/[Fe(VI)] molar ratio was 4:1 with a low Fe(VI) dosage (218 µM), the changes in HA and HCO 3 − concentrations affected the transformation of dimethoate, the presence of Cl − , SO 4 2− and NO 3 − had a negligible effect, and the S(IV)/Fe(VI) system performed well in real waters. The S(IV)/Fe(VI) system has excellent oxidation performance for the removal of organic pollutants in water, with a final pH (pH = 6.6) close to neutral and ultimate products of SO 4 2− and Fe(OH) 3 , which has great potential for engineering applications.
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 10
·1900-1910
·
IF 4.239
Udayakumar Veerabagu,Gowsika Jaikumar,Fushen Lu,Franck Quero
Copper iodide (CuI) nanoparticles/boron nitride nanosheets (BNNSs) were prepared via an ultrasonication method and subsequently characterized. For the first time, these newly synthesized CuI/BNNS supports were used as heterogeneous catalysts for C–H difluoromethylation reactions, including the synthesis of heteroarenes and terminal alkynes. The versatility of the catalyst was demonstrated for the synthesis of diverse substituted difluoromethylated heteroarenes and terminal alkynes from electron-deficient and electron-rich groups, resulting in moderate to high yields (up to 91%). The reaction was carried out in a greener medium (cyrene instead of dimethylformamide and N-methyl-2-pyrrolidone) at room temperature using (difluoromethyl)trimethylsilane and 9,10-phenanthraquinone in the presence of the CuI/BNNS catalyst containing ∼3 wt% Cu and I. Notably, its activity was found to provide higher yield, shorter reaction time, and fewer usage of the catalyst, compared with commercial CuI catalysts. In addition, the CuI/BNNS catalyst could be easily recovered and recycled up to five times, with only a slight decrease (3%) in its catalytic activity, providing attractive features for chemical engineers to use this catalyst for the large-industrial scale synthesis of organic bioactive compounds involving C–H difluoromethylation reactions.
✓ 已验证
DOI
高影响因子
Chemical Science
·
2019
·Vol. 10
·期 35
·8179-8186
·
IF 9.556
Xiaohong Pan,Yuehui Zhao,Tingting Cheng,Aishan Zheng,Anbin Ge,Lixin Zang,Kehua Xu,Bo Tang
Reductive stress, the opposite of oxidative stress, represents a disorder in the redox balance state which is harmful to biological systems. For decades, the role of oxidative stress in tumor therapy has been the focus of attention, while the effects of reductive stress have been rarely studied. Here, we report the anti-cancer effects of reductive stress induced by three natural antioxidants (resveratrol, curcumin and celastrol). Considering the fact that the solid tumor microenvironment suffers from hypoxia, we performed cell experiments under hypoxic conditions. In order to observe the reductive stress, we first developed an ultrasensitive fluorescent probe (TCF-MQ) for specifically imaging NAD(P)H which is a marker of reductive stress. TCF-MQ responded to NAD(P)H rapidly and exhibited high sensitivity with a detection limit of 6 nM. With the help of TCF-MQ, we found that upon the treatment of HepG2 cells with pharmacological doses of three natural antioxidants under hypoxic conditions, high levels of NAD(P)H were produced before cell death. The excess NAD(P)H resulted in reductive stress instead of oxidative stress. In contrast, under normoxic conditions, there was no reductive stress involved in the process of cell death induced by three natural antioxidants. Therefore, we hypothesize that the mechanism of cancer cell death induced by natural antioxidants under hypoxia should be attributed to the reductive stress.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Neurology
·
2019
·
IF 2.635
Zhang Jie,Jiang Yunyao,Liu Nan,Shen Ting,Jung Hyo Won,Liu Jianxun,Yan Bing Chun
Senkyunolide-H (SEH), a major bioactive compound extracted from Ligusticum chuanxiong, has been reported to be effective in preventing cerebral ischemic stroke (CIS). In this study, we employed network pharmacology to reveal potential mechanism of SEH against CIS on a system level and confirmed the therapeutic effects of SEH on CIS by models of cerebral ischemia-reperfusion in vivo and in vitro. Through protein-protein interaction networks construction of SEH- and CIS-related targets, a total of 62 key targets were obtained by screening topological indices and analyzed for Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment. Gene Ontology analysis indicated that SEH might have a role in treating CIS via regulating some biological processes including regulation of transcription from RNA polymerase II promoter, epidermal growth factor receptor signaling pathway, phosphatidylinositol-mediated signaling, and some molecular function, such as transcription factor and protein phosphatase binding and nitric oxide synthase regulator activity. Meanwhile, the Kyoto Encyclopedia of Genes and Genomes analysis showed that phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway was significantly enriched. In addition, our result showed that SEH posttreatment significantly decreased the neurological scores, infarct volume, and neuronal death in the middle cerebral artery occlusion mice. Moreover, the PI3K/Akt/nuclear factor kappa B signaling pathway was activated by intragastric administration of 40 mg/kg SEH, as verified by Western blot. In vitro, treatment of PC12 cells with 100 μM SEH markedly reduced cell death induced by oxygen-glucose deprivation through the activation of PI3K/Akt/nuclear factor kappa B pathway, and the therapeutic effect of SEH was obviously inhibited by 10 μM LY294002. In summary, these results suggested that SEH carries a therapeutic potential in CIS involving multiple targets and pathways, and the most crucial mechanism might be through the activation of PI3K/Akt/nuclear factor kappa B (NF-κB) signaling pathway to inhibit inflammatory factor releases and increase the antiapoptosis capacity. Our study furnishes the future traditional Chinese medicine research with a network pharmacology framework.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2018
·
IF 0
Tingting Cheng,Jian Chen,Aofei Cai,Jian Wang,Haiyan Liu,Yuandong Hu,Xiaojun Bao,Pei Yuan
A series of silica supported Pd (Pd/SiO2) catalysts were prepared in various HCl concentrations (CHCl) of the impregnation solution with different electrostatic interactions between Pd precursor and support, and their catalytic properties were evaluated by the selective hydrogenation of nitrile butadiene rubber (NBR). The results show that with the CHCl increasing from 0.1 to 5 M, the particle size of Pd nanoparticles dramatically decreases from 24.2 to 5.1 nm and stabilizes at ∼5 nm when CHCl is higher than 2 M. Using the catalysts prepared with a high CHCl (>2 M), an excellent hydrogenation degree (HD) of ∼94% with 100% selectivity to C═C can be acquired under mild conditions. Interestingly, the HD could be remarkably increased from 65 to 92% by increasing only CCl– from 0.1 to 2 M with the addition of NaCl while keeping CH+ at 0.1 M. This is because PdCl42– is the predominant existing form of precursor at high CCl–, which has a strong electrostatic attraction with the positively charged support favorable for the formation of small-sized Pd nanoparticles over silica. Notably, Pd leaching behavior during the hydrogenation reaction is closely related to CH+, and the higher the CH+, the less Pd residues are detected in the hydrogenated NBR. Our contribution is to provide a facile strategy to synthesize effective and stable Pd/SiO2 catalysts via adjusting the electrostatic interaction, which exhibits a high activity and selectivity for NBR hydrogenation.
✓ 已验证
产品关联
DOI
PubMed
危险品化学品经营许可证（带存储）