FOOD CHEMISTRY
·
2022
·
IF 9.231
Min Li,Ping Zhan,Peng Wang,Honglei Tian,Jingzhang Geng,Lixia Wang
Aging is an indispensable process to endow Huangjiu with harmonious and pleasant fragrances. To elucidate the effects of aging time on aroma characteristics of Xiecun Huangjius, 5 samples aged for different years (3 to 9 years) were investigated by sensory evaluation, gas chromatography - mass spectrometry-olfactometry/detection frequency (GC – MS - O/DF), and odor activity values (OAV) analysis. Sensory results showed significant differences existed among different aged Xiecun Huangjius. Totally, 54 compounds in Xiecun Huangjius were identified by GC–MS and further quantified. Of these, 16 were confirmed as key aroma-active compounds with high OAVs and DFs. Partial least squares regression (PLSR) indicated that the old-aged Y9 sample was greatly related to most aroma-active compounds, thus presented the coordinated overall flavor. Together with orthogonal partial least squares-discriminant analysis (OPLS-DA), 4 compounds (diethyl succinate, furfural, nonanal and isoamyl alcohol) were determined as the main markers for classification of the old-aged Y9 and the other-aged samples.
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高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 35
·期 1
·2202462
·
IF 32.086
Huan Liang,Shuai Zhang,Yawen Liu,Yang Yang,Yubai Zhang,Yahe Wu,Hongtu Xu,Yen Wei,Yan Ji
Sophisticated shape-shifting structures and integration of advanced functions often call for different-chemistry-based polymers (such as epoxy and polyurethane) in a unified system. However, permanent cross-links pose crucial obstacles to be seamless. Here, merging interfaces via hybrid exchange reactions among different dynamic covalent bonds (including ester, urethane, thiourethane, boronic–ester, and oxime–ester linkages) is proposed, breaking the long-lasting restriction that these widely used bonds only undergo self-exchange reactions. Model compound studies are conducted to verify that hybrid exchange reactions occur. As demonstrations, different liquid crystal elastomers are tenaciously joined into coherent assemblies, with the desired biomimetic structures (e.g., flying fish containing stiff and flexible parts) and rare deformation modes (e.g., flower blooming upon both heating and cooling). Besides connecting polymers, hybrid exchange reactions also facilitate the creation of new materials through cross-fusion of different polymers. In addition to the polymers used in this work, hybrid exchange reactions can be adapted to other polymers based on similar mechanisms and beyond. Besides shape-shifting-related areas (e.g., soft robots, flexible electronics, and biomedical devices), it may also foster innovation in other fields involving general polymers, as well as promote deeper understanding of dynamic covalent chemistry.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiu-Zhi Wei,Fentahun Wondu Dagnaw,Jianguo Liu,Longlong Ma
Carboxylic acid is one of the most crucial and widely used organic chemicals in daily human life activities. Hence preparation of this important chemical was performed under the application of the highly selective photo-catalysts through oxidation of alcohols to carboxylic acids. Herein, we have designed and disclosed a binary NH 2 -MIL-125(Ti)/ NaBr) catalyst system to realize the effective transformation of alcohols into carboxylic acids under visible light irradiation . Hence, derivatives of benzyl alcohol containing either electron withdrawing and donating groups as well as aliphatic primary alcohols were effectively converted into the corresponding carboxylic acids. Based on our findings, NH 2 -MIL-125(Ti) based photocatalytic system has shown efficient and highly selective activities for oxidation of alcohol especially the in-situ conversion of co-catalyst NaBr into the corresponding free radical can enhance the alcohol oxidation performance of the catalytic system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Minghui Sun,Xiaoguang Wang,Honghui Pan,Zhihui Pang,Yanrong Zhang
Industry for producing the vital chemical hydrogen peroxide (H 2 O 2 ) requires drastically reductions in energy consumption and environmental pollution. Solar chemical conversion from O 2 to H 2 O 2 is considered to be the most promising alternative method, nevertheless, weak energy coupling between photo-charges and adsorbed species limits the yield of H 2 O 2 . Herein, we demonstrate that oxygen vacancy-rich BiVO 4 can efficiently generate H 2 O 2 in pure water under visible light irradiation without any heterojunctions or precious-metal cocatalysts. Oxygen vacancies, as typical coordinatively unsaturated sites, enable efficient O 2 adsorption and enrichment, and then thriving chemisorption can spatially facilitate photoexcited electrons transfer to oxygen species. Compared to pristine BiVO 4 , defective BiVO 4 enhanced O 2 adsorption and interfacial electron transfer rate to O 2 by 19 and 23 times, respectively, resulting in a more than 32-fold increase in H 2 O 2 production. This research offers a new perspective for bridging solar and chemical energy by assuring species chemisorption.
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高影响因子
Small
·
2022
·Vol. 18
·期 32
·2203020
·
IF 15.153
Kai Deng,Wenxin Wang,Qiqi Mao,Hongjie Yu,Ziqiang Wang,You Xu,Xiaonian Li,Hongjing Wang,Liang Wang
Tailoring the morphology and crystal structure of metallene is critical to improve its electrocatalytic performance. In this work, hetero-phase RhB metallene ( h -RhB metallene) with amorphous/crystalline structure is readily prepared by a two-step method. The h -RhB metallene is very unique in its non-metallic heteroatom doping and amorphous/crystalline structure. Benefiting from the unique metallene structure and the optimized electronic states induced by the incorporation of B atoms, the h -RhB metallene exhibits superior performance for hydrogen evolution reaction and hydrogen peroxide electro-oxidation reaction (HPOR). When coupled with HPOR, the h -RhB metallene|| h -RhB metallene water electrolysis two-electrode system exhibits a lower cell voltage of 0.379 V (@ 10 mA cm −2 ) compared with the overall water splitting (1.35 V). The presented synthetic method provides a powerful strategy to design metallene with hetero-phase for energy-saving H 2 production.
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高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yan Wu,Ling-Hui Kong,Wen-Ting Ge,Wen-Jie Zhang,Zhen-Yue Dong,Xiao-Jing Guo,Xi Yan,Yan Chen,Wan-Zhong Lang
A porous V/SiO 2 sphere composite (VO X @SiO 2 ) was synthesized using one-step sol-gel method. Benefiting from the redox properties of vanadium and the hydrophilic property, VO X @SiO 2 showed good catalytic performances for the selective oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) in aqueous phase through peroxymonosulfate (PMS) activation, and performed far better in water than in various organic solvents. The redox cycle of V V /V IV was supposed to be responsible for PMS decomposition in the VO X @SiO 2 /PMS system. The S O 4 ∙ - , 1 O 2 and mediated electron transfer were revealed to play a major role in the selective oxidation of BzOH to BzH. The intrinsic kinetics was analyzed to calculate the chemical reaction rate (r a ) and reaction order (n = 0.33) with respect to BzOH. This study provided some insights into the development of vanadium-based heterogeneous catalyst for the selective oxidation of BzOH to BzH through PMS activation.
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Nano Energy
·
2022
·
IF 19.069
Zeyu Song,Jihuai Wu,Liuxue Sun,Tingting Zhu,Chunyan Deng,Xiaobing Wang,Guodong Li,Yitian Du,Qi Chen,Weihai Sun,Leqing Fan,Hongwei Chen,Jianming Lin,Zhang Lan
Solar energy is clean, open, and infinite, but solar radiation on the earth is fluctuating, intermittent, and unstable. So, the sustainable utilization of solar energy needs the complementary combination of high-efficient energy conversion and low-loss energy storage technologies. Hence, a photocapacitor integrated with photo-electrical conversion and electric-chemical storage functions in single device is a cost-effective, volume-effective and functional-effective optimal choice. However, the highest reported conversion storage efficiency of single device is less than 13 %. Here, we investigate the relationship among various efficiencies of photocapacitors during conversion storage process, and propose a function portfolio management concept. Accordingly, a three-terminal photocapacitor integrated with perovskite solar cell and symmetrical supercapacitor units is designed. By harmonizing the energy matching between conversion and storage units and seeking the maximum power points coincide and the maximum efficiency points synchronize, the solar energy conversion storage efficiency of the integrated photocapacitor surpasses milestone of 20 %.
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高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Shudi Yu,Jin Li,Hui Zhang
A series of hierarchically structured hybrids Ni x Mg 3-x Al-LDH/rGO (LDH: layered double hydroxides, x = 1, 1.5 and 2, rGO: reduced graphene oxide) supported atomically precise Au n ( n = 25, 38 and 127) nanoclusters (NCs) catalysts Au n /Ni x Mg 3-x Al-280 were firstly prepared via a double pH-controlled electrostatic adsorption method using captopril-capped Au n NCs as precursors followed proper calcination . Detailed characterizations show that the as-obtained hierarchically structured Au n NCs catalysts possess the nanosheet array-like structure formed by the LDHs nanosheets (∼55–70 × 10 nm) interdigitated vertically grown on the both sides of rGO layers, and Au n NCs with size of 1.0–1.9 nm are mainly dispersed on the edge and cross-linking sites of LDH/rGO hybrid. All the hierarchically structured Au n NCs catalysts exhibit excellent catalytic activity for the solvent-free oxidation of benzyl alcohol without additional base, and the activities show a volcanic trend with increasing Ni/Mg ratios and gradually decrease with the increased Au atomicities in Au n clusters. The highest TOF value of 5118 h −1 for the Au 25 /Ni 1.5 Mg 1.5 Al-280 can be ascribed to the smallest Au 25 NCs containing the Au 0 /Au δ+ -Ni 2+ /Mg 2+ –OH interface with the highest Au δ+ /(Au 0 + Au δ+ ) ratio, and the strongest Au 25 −LDH/rGO synergistic interaction along with hierarchical nanosheet array-like structure facilitating the transmission and diffusion of the reactants. The present work provides a new idea for preparing the hierarchically structured LDH/rGO hybrid supported metal nanoclusters catalysts with high-performance for various catalytic applications.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
·
IF 5.895
Jing Wang,Mengru Li,Hui Wang,Wenjing Huang,Fang Li,Lili Wang,Chi-Tang Ho,Yanyan Zhang,Liang Zhang,Xiaoting Zhai,Xiaochun Wan
Aroma extract dilution analysis was performed on volatile fractions extracted from a freshly prepared Dahongpao (DHP) tea infusion using solvent-assisted flavor evaporation, yielding 65 odor-active domains with flavor dilution factors ranging between 32 and 32,768. In addition, six aromatic substances were captured by headspace analysis. Quantitation of 54 compounds by an internal standard method and stable isotope dilution assays revealed that the concentrations of 32 odorants exceeded their respective orthonasal odor threshold values in tea infusion. The results of odor activity values (OAVs) suggested that 2-metylbutanal (malty) and γ-hexalactone (coconut-like) had the highest OAVs (248 and 154). Eight odorants including γ-hexalactone (OAV 154), methyl 2-methylbutanoate (59), phenylacetic acid (7.2), acetylpyrazine (5.7), 2-methoxyphenol (3.4), p-cresol (2.7), 2,6-diethylpyrazine (2.7), and vanillin (1.8) were newly identified as key odorants in DHP tea infusion. An aroma recombination model in a non-volatile matrix extracted from tea infusion satisfactorily mimicked the overall aroma of DHP tea infusion, thereby confirming the identification and quantitative experiments. Omission experiments verified the obvious significance of 6-methyl-5-hepten-2-one (OAV 91), 2-ethyl-3,5-dimethylpyrazine (19), 4-hydroxy-2,5-dimethylfuran-3(2H)-one (13), and acetylpyrazine (5.7) as key odorants for the special roasty and caramel-like aroma of DHP tea.
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高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2138-2153
·
IF 11.806
Ding Zhaodong,Tian Zhongjian,Ji Xingxiang,Dai Hongqi,Si Chuanling
Inspired by the hydrophobic waxy layer structure on the back of the desert beetle, a super-hydrophobic material was prepared via the sol–gel silanisation of porous cellulose membrane (CM) using triethoxysilanes with different carbon chain lengths (R-siloxane) and (CH 3 CH 2 O) 4 Ti as a catalyst in 3 min. The R-siloxane CM was both super-hydrophobic and oleophilic (water contact angle (CA) > 150°, dodecane CA ≈ 0°) and resisted liquids with surface tensions as low as 15 mN·m −1 , correlated with the length of the R-siloxane and roughness of the CM. Instructed by the water collection behavior of the desert beetle, a pristine filter CM was added on the R-siloxane filter CM to accelerate separation of Span 80–stabilised water-in-oil emulsions by generating a surface energy gradient (SEG). The composite membrane with SEG separated the emulsions with higher surfactant concentrations and provided a higher efficiency up to 99.98% compared with single-layer R-siloxane membrane. This bio-inspired catalytic one-step approach for preparing R-siloxane cellulose composite membranes can potentially replace petroleum-based products for oil purification. Graphical Abstract Bio-inspired preparation of R-siloxane composite cellulose membrane with surface energy gradient for highly efficient water-in-oil emulsion separation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jinke Wang,Yao Huang,Lingwei Ma,Xin Guo,Shanghao Wu,Chenhao Ren,Dawei Zhang
In this work, a smart coating with corrosion-sensing and self-healing dual functions was developed on carbon steel by incorporating the urea formaldehyde (UF) microcapsules loaded with 1,10-phenanthroline (Phen) molecules. Phen as both the corrosion-sensing indicator and corrosion inhibitor was encapsulated into the UF microcapsules via the oil-water (O/W) emulsion in-situ polymerization method. When the coating was damaged, the Phen molecules released from UF/Phen microcapsules would react with the Fe 2+ ions generated from the active anodic corrosion site of the carbon steel substrate, and displayed a prominent red color chelate compound for corrosion-sensing application. During the neutral salt spray test, the corrosion evolution underneath the damaged coating can be rapidly detected within 15 min. Besides, the corrosion activity near the coating scratch can be effectively inhibited due to the adsorption of released Phen on the exposed substrate surface. After 72 h of immersion in 3.5 wt% NaCl solution, the low frequency impedance modulus of the scratched coating containing 10 wt% UF/Phen microcapsules was almost 7 times that of the scratched blank coating. The smart coating can not only achieve timely corrosion sensing, but also suppress the corrosion activity, which is of great importance for practical corrosion protection applications.
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Biomaterials Science
·
2022
·Vol. 10
·期 19
·5520-5534
·
IF 7.59
Xiaojuan Li,Weier Bao,Ming Liu,Jiaqi Meng,Zicheng Wang,Mingqi Sun,Liaoyun Zhang,Zhiyuan Tian
A new type of polymeric nanomicelle-based nanoagent (denoted as PT@MFH hereafter) capable of the highly sensitive release of the chemotherapeutic drug paclitaxel (PTX) upon exposure to a near-infrared (NIR) laser trigger was developed. Specifically, PTX and a photothermal polymer (T-DPPT) were encapsulated in the cavity of nanomicelles, which were constructed from an amphiphilic block copolymer (PCL-PEEP) with a lower critical solution temperature (LCST) of ∼54 °C. Owing to the unprecedented ability of the T-DPPT moiety to harvest near-infrared light, with a mass extinction coefficient at 808 nm of up to ∼80.8 L g−1 cm−1, and convert NIR light to heat, with a photothermal conversion efficiency (η) of up to ∼70%, local hyperthermia was promptly realized via irradiation from an 808 nm laser with extraordinarily low output power. This enabled remarkable contrast in the local temperature and drug release between the “silent” state (prior to phototriggering) and the “activated” state (after phototriggering). This NIR-light-activated local hyperthermia and drug release presented the basis for combined chemotherapy and photothermal therapy (PTT) in antitumor treatment and displayed superb therapeutic efficacy. This pattern together with the high spatial precision imparted by laser triggering jointly contributed to the maximum combined antitumor efficacy to the tumor, while exhibiting minimal side effects on the normal tissues, as preliminarily verified in the in vivo experiment regarding the ability of PT@MFH to efficiently inhibit tumor growth in tumor-bearing model mice.
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高影响因子
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