RHEOLOGICA ACTA
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2022
·Vol. 61
·期 3
·229-242
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IF 2.824
Stadler Florian J.,Cui Shuming,Hashmi Saud,Handschuh-Wang Stephan,Li Wenqiang,Wang Shichang,Yan Zhi-Chao,Zhu Guangming
In the last years, the 3iTT protocol—a dynamic-mechanical test (DMT) at low deformation and constant frequency, followed by a start-up flow (SUF) at constant shear-rate, and a DMT—was developed as an alternative to check for changes in material behavior, which was extended to form the multiple interval thixotropic test protocol (miTT), differing in modifying the shear rates systematically. The results of this test routine are a viscosity function η( \(\dot{\gamma }\) ) with increasing and decreasing \(\dot{\gamma }\) and the dependence of G’ and G” on \(\dot{\gamma }\) previous test . More importantly, the G’ and G” are strongly influenced by the previously applied shear rate. While regular emulsions show a decrease of G’ and G” upon a higher shear rate \(\dot{\gamma }\) in the previous shear step, the pickering emulsions with graphene oxide show an increase. In both cases, the change is approximately reversible. The changes in G’ and G” correlate well with the emulgel composition.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 3
·2413-2418
·
IF 2.195
Hu Bo,Yang Fan,Peng Ye,Hang Chunjin,Chen Hongtao,Lee Changwoo,Yang Shihua,Li Mingyu
Ag nanoparticle (NP) paste is considered to be a next-generation thermal interface material. However, its sintered microstructure is at risk of volume shrinkage and mechanical property degradation under harsh environments. In this work, silicon carbide (SiC) NPs were mixed with Ag NP paste to improve the stability and reliability of sintered Ag joints. Robust joints were prepared by a rapid thermal compression method at 275 °C for 20 s. Although the addition of SiC NPs degraded the initial shear strengths of these joints, the SiC-containing joints exhibited excellent mechanical properties and microstructural stability during thermal shock tests from − 50 to 150 °C for up to 1000 cycles. When the added amount of SiC NPs was 2%, the joints achieved the highest shear strength of 87.1 MPa (after 1000 cycles). In addition, the shear strengths of the joints were investigated at 250 °C. The addition of SiC NPs is believed to enhance the reliability of joints at high temperature.
研究领域:
材料科学
·
纳米技术
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2019
·Vol. 245
·期 4
·825-835
·
IF 2.056
Zhong Jian-Jun,Liao Ningbo,Li Charlie,Wang Wenjun,Wang Danli,Pu Yunfeng,Ye Xingqian,Liu Donghong
Urocanic acid, deaminated histidine and the first intermediate in the histidine utilization (Hut) pathway in bacteria, has recently been suggested to have adverse health effects by inducing scombrotoxicosis and immunosuppression after trans – cis isomerization. This work aimed to shed some light on the microbiology of its formation in scombroid fish, given that such information is very scarce. The isolation of urocanic acid producers from chub mackerel was basically based on enrichment of bacteria possessing the Hut pathway with histidine as the sole source of carbon, energy, and nitrogen. Morphological and molecular identification revealed that the isolates ( n = 12), taken from the skin, gills, and intestine, were comprised entirely of Acinetobacter from at least five species. This implies that the Hut pathway in the microbes can be particularly active and as such conferred a growth advantage. Dynamic monitoring of bacterial growth and urocanic acid production in fish juice broth indicated that urocanic acid is a primary metabolite and its production is a closely growth-associated process. This in turn implies that its production can be controlled directly by suppressing the bacterial growth. Several potential methods are proposed through a study of the growth characteristics and preservative susceptibility of representative isolates. In conclusion, this work suggests that Acinetobacter can constitute a potentially important group of urocanic acid producers in chub mackerel.
研究领域:
微生物学
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食品安全
·
健康科学
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 16
·20545-20553
·
IF 3.056
Xu Wenjing,Tan Liju,Zhao Ting,Zhu Xiaolin,Wang Jiangtao
The expanding production and widespread application of acrylamide caused inevitable release to aquatic ecosystems. Contrary to its extensive attention to human and animal health, the hazards of acrylamide to the aquatic primary productivity have been rarely studied. The potential effects of acrylamide on the marine algae ( Nitzschia closterium ) and the limnetic algae ( Scenedesmus quadricauda ) were investigated by monitoring cell abundance, total chlorophyll content, maximum photosystem II (PSII) quantum yield (Fv/Fm), and reactive oxygen species (ROS). The growth of two algae was significantly inhibited by acrylamide. The 96 h EC 50 of acrylamide on N. closterium and S. quadricauda were 5.50 mg L −1 and 45.3 mg L −1 , and no observed effect concentration (NOEC) were 1.07 mg L −1 and 6.97 mg L −1 , respectively. After 96 h exposure to 50 mg L −1 of acrylamide, the total chlorophyll content declined to approximate 18% ( N. closterium) and 48% ( S. quadricauda ), and Fv/Fm was observed to be 0.35 and 0.32 for N. closterium and S. quadricauda , respectively. ROS was significantly increased following higher exposure concentrations, and its levels increased around 2.1-fold and 1.4-fold following exposure to 5 mg L −1 of acrylamide. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed the visible cell plasmolysis, rupture of the plasma membrane, cell vacuolization, and disintegration of chloroplasts of the algae caused acrylamide.
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COLLOID AND POLYMER SCIENCE
·
2022
·Vol. 300
·期 9
·1075-1086
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IF 2.434
Zhao Jing,Cui Lu,Wang Xiaoran,Deng Chunyu
Thermosensitive hydrogels based on chitosan play an important role in the field of tissue engineering and drug delivery system, with excellent properties such as biocompatible, biodegradable, and minimally invasive. In this work, a dual ionically crosslinked injectable hydrogel was composed of polyelectrolyte complex (PEC) and sodium hydrogen carbonate (SHC) as non-toxic gel agent. The PEC was prepared by ionic interaction between positively charged chitosan and negatively charged thermosensitive polymer poly(NIPAm-co-AMPS). The injectable hydrogel with rapid gelation was obtained by optimizing feed ratio, SHC amount, concentration, and temperature. The swelling, temperature sensitive, rheological, and cytotoxic properties of the hydrogels were evaluated. The potential of hydrogels applied in drug delivery system was studied by measuring the release property in vitro, taking aspirin as drug model. The results showed that the hydrogel exhibited a sol–gel transition at about 37 ℃, when the volume ratio of CS (20 mg/mL), PNAM (4.0 mg/mL), and SHC (0.4 M) was 1:0.2:0.5; the hydrogel with good mechanical strength and gelation time of 1–3 min in the physiological conditions was obtained. The hydrogels prepared with high SHC concentration or more gel agents showed shorter gelation time and better thermostability. The hydrogel presented a 1-day sustained release of aspirin with no significant burst release in vitro. The release properties demonstrated that the hydrogels released aspirin in a sustained manner, about 87% in 24 h. L929 cells had good survival and proliferative rates within CS-PNAM/SHC hydrogel after 24 h, showing excellent biocompatibility. Therefore, the injectable thermos-responsive hydrogels formed by CS-PNAM/SHC and loaded with aspirin turned into a smart drug delivery system, showing great potential for controlled release.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Zhou Xian,Gao Xiaofeng,Liu Mingjie,Gao Zirui,Qin Xuetao,Xu Wenhao,Ye Shitong,Zhou Wenhua,Fan Haoan,Li Jing,Fan Shurui,Yang Lei,Fu Jie,Xiao Dequan,Lin Lili,Ma Ding,Yao Siyu
The coupling of acetonitrile into succinonitrile, an important terminal dinitrile for value-added nylon production, via a dehydrogenative route is highly attractive, as it combines the valuable chemical synthesis with the production of green hydrogen energy. Here, we demonstrate that it is possible to achieve a highly selective light driven dehydrogenative coupling of acetonitrile molecules to synthesize succinonitrile using anatase TiO 2 based photocatalysts in aqueous medium under mild conditions. Under optimized conditions, the formation rate of succinonitrile reaches 6.55 mmol/(g cat *h), with over 97.5% selectivity to target product. Mechanism studies reveal that water acts as cocatalyst in the reaction. The excited hole of anatase semiconductor oxidizes water forming hydroxyl radical, which subsequently assists the cleavage of sp 3 C-H bond of acetonitrile to generate ·CH 2 CN radical for further C-C coupling. The synergy between TiO 2 and Pt cocatalyst is important to enhance the succinonitrile selectivity and prevent undesirable over-oxidation and hydrolysis. This work offers an alternative route to prepare succinonitrile based on renewable energy under mild conditions and avoid the use of toxic reagents and stoichiometric oxidative radical initiators.
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Nano Research
·
2016
·Vol. 9
·期 6
·1763-1774
·
IF 8.893
Shoaib Anwer,Ji Muwei,Qian Hongmei,Liu Jiajia,Xu Meng,Zhang Jiatao
In this work, we present a new versatile strategy to prepare noble metal (Au, Ag and Cu) nanoclusters on TiO 2 nanosheets in large scales with exposed (001) facets with controlled size, crystalline interface, and loading amount. By precise in situ calcination, the metal (M = Au, Ag, and Cu) nanocrystals with controllable size and better crystalline interface with the TiO 2 support have been prepared. The potential application of the as-prepared Au, Ag, and Cu nanoclusters on TiO 2 nanosheets as potential heterogeneous catalysts for organic synthesis, such as catalytic reduction of 4-nitrophenol to 4-aminophenol, has been demonstrated. After calcination, Au, Ag, and Cu nanocrystals were found to be proficient cocatalysts for photocatalytic H 2 evolution, particularly the Au cocatalyst. Based on precise high-resolution transmission electron microscopy (HRTEM) and inductively coupled plasma optical emission spectrometry (ICP-OES) analyses, the flexible control of their size and loading amount as well as their intimate contact with the TiO 2 nanosheet enhanced the photocatalytic H 2 evolution activity and the sensitivity of the photocurrent response of the film. Furthermore, this aqueous-directed synthesis of metal nanoclusters on a support will generate further interest in the field of nanocatalysis.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 22
·1293
·
IF 3.5
Li Xi,Zhang Luyao,Liu Ling,Yan Yunxia,Wang Ziqing,Wang Bing
Soil co-contamination by organic pollutants and toxic metals has become an increasingly prominent environmental concern worldwide, largely driven by intensive industrial and anthropogenic activities. In this study, BC-nZVI coupled with three oxidants—persulfate (PS), BS, and hydrogen peroxide (HP)—was evaluated for the simultaneous remediation of BaP and Cr(VI) co-contaminated soil. Among the tested systems, BC-nZVI/BS exhibited the best overall performance, achieving 77.7% BaP removal and 97.6% Cr(VI) reduction, followed by BC-nZVI/HP and BC-nZVI/PS. Among the three systems, the BC-nZVI/BS system maintained comparatively stable remediation performance over the tested pH range. Coexisting Cr(VI) exerted a pronounced synergistic effect on BaP degradation in the BC-nZVI/BS system, likely via promoting oxidant activation. Six classes of intermediates with simpler structures than BaP were tentatively identified, indicating the progressive transformation of BaP during the remediation process. Post-treatment characterization revealed the presence of Cr 2 O 3 , FeCr 2 O 4 , and Cr(OH) 3 , suggesting that Cr(VI) was predominantly removed through reductive precipitation to Cr(OH) 3 . Overall, the BC-nZVI/BS system showed promising potential for the remediation of BaP-Cr(VI) co-contaminated soils.
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Nature Communications
·
2026
·
IF 18.1
Zhou Juemou,Zhang Fumiao,Wang Chen-Ma,Ouyang Ting,Xing Mingming,Cui Xiaoli,Ma Danting,Liu Chunguang,Shi Xiaofeng,Hu Bojie,Zhang Shuli,Zhang Yuqi,Zhang Weiping J.,Xie Xiangyang
Feeding is regulated not solely by intrinsic energy demands, but also by various environmental cues. Food sight and odor are two essential food-related cues that promote human eating; nonetheless, the underlying neural mechanisms remain unknown. Here, we show that during energy deficit, food sight inhibits the ventromedial hypothalamus (VMH) neuronal activity, thereby promoting feeding and food-associated contextual memory in mice. VMH neurons receive direct GABAergic input from the suprachiasmatic nucleus (SCN) that is rapidly activated by food sight. Either knockout of VMH RuvB-like 2 (RUVBL2) or inhibition of RUVBL2-expressing neurons in the VMH (VMH RUVBL2 ) promotes feeding and food-associated contextual memory. Interestingly, VMH RUVBL2 neurons exert these effects by sequentially projecting to the supramammillary nucleus (SuM) and the hippocampal dentate gyrus (DG). Together, this study identifies SCN GABA → VMH RUVBL2 → SuM→DG neural circuit underlying food sight-promoted feeding and food-associated contextual memory in mice.
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JOM
·
2023
·
IF 2.6
Guo Yufeng,Wang Chao,Wang Shuai,Chen Feng,Yang Lingzhi,Zheng Yu
Avoiding the formation of anosovite phase during the ilmenite reduction process is crucial for the preparation of boiling chloride stove. In this study, the dominant regions of different reduction products of ilmenite in CO-CO 2 system and the phase transformation behavior of pure ilmenite in the reduction process were studied by XRD and SEM-EDS analysis. It was confirmed that the reduction of ilmenite (FeTiO 3 ) at < 1150°C went through two stages: the formation of metal iron (Fe) with rutile (TiO 2 ) and metal iron (Fe) with anosovite (Ti 3 O 5 ). At > 1150°C, the reduction of ilmenite went through two stages: the formation of metal iron (Fe) with pseudobrookite (FeTi 2 O 5 ) and metal iron (Fe) with anosovite (Ti 3 O 5 ). As a typical ilmenite resource, Panzhihua ilmenite is used to study the reduction behavior of actual ore in CO-CO 2 system. The reaction of forming metal iron (Fe) with pseudobrookite (FeTi 2 O 5 ) could occur at 1000°C, and magnesium was dissolved in the product during the formation of anosovite. The presence of magnesium reduces the dominant area of metal iron (Fe) with rutile (TiO 2 ), which is not conducive to the reduction of iron.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·
IF 5.3
Lin Xiaoxia,Zhao Jie,Zhang Yongqi,Li Yuqi,Liao Yiqiang,Zhang Hui
Photocatalytic water treatment is an advanced and efficient technology for water purification. Among various photocatalysts, iron-based metal–organic frameworks (Fe-MOFs) are widely applied for mineralizing organic wastewater due to their excellent water stability and photocatalytic activity. However, their practical application is impeded by insufficient photocatalytic performance, irreversible collapse of the framework structure during repeated use, and difficulty in recovery. In this study, we fabricated a Graphene oxide (GO) structure-oriented NH 2 -MIL-88B(Fe)/graphene oxide/sodium alginate (NM88B/GO/SA) aerogel for the removal of dyes and antibiotics, using GO interface regulation and dual-network crosslinking methods. In this hybrid system, a NM88B/GO heterostructure was formed through the directional growth of NM88B on the surface of GO. The introduction of sodium alginate (SA) enhanced the robustness and stability of the matrix, and effectively avoided aerogel fragmentation. With 30 wt% catalyst loading, the composite aerogel exhibited excellent photocatalytic degradation performance towards high-concentration (50 ppm) tetracycline hydrochloride (TC-HCl), achieving over 99% removal rate in 150 min. It also effectively degraded methylene blue (MB) at 10–30 ppm with over 99% removal rate. Furthermore, the aerogel showed excellent shape recovery ability, stability, and reusability. After five repeated tests, it maintained over 95% degradation efficiency for both TC-HCl and MB. This advanced aerogel holds great promise as a highly efficient and reusable photocatalyst for removing antibiotics and dyes from wastewater. Graphical Abstract
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Science China-Chemistry
·
2023
·
IF 9.6
Ambreen Ambreen,Zhou Yue,Gu Wanmiao,You Qing,Fang Liang,Bian Guoqing,Yan Nan,Xia Nan,Wu Zhikun
Surface thiolates play important roles in evincing the structures and properties of thiolated metal nanoclusters—one type of recently emerging inorganic-organic hybrids, and thus the thiolate substitution, especially single thiolate substitution, is highly desirable for subtly tailoring the structures and properties of metal nanoclusters. However, such a single-thiolate substituting is challenging, and its influence on the metal-metal and metal-sulfur bonds remains mysterious due to the absence of the single-thiolate-substituted structure. Here, we developed a combined method, concurrently synthesized the single-thiolate-substituted nanocluster and its parent nanocluster, and successfully resolved their structures by single crystal X-ray crystallography, which reveals that the single thiolate substitute has an obvious influence on the metal-metal and metal-sulfur bond lengths although it has no effect on the absorption profile. Interestingly, the metal-metal and metal-sulfur bonds show various thermal extensibility and even the negative thermal expansion phenomena of the Au–S bond were observed in the single-thiolate-substituted nanocluster. The bond length-related stability was also observed. Overall, this study highlights a novel synthesis method and offers novel structural insights and an in-depth structure-property correlation of thiolated metal nanoclusters.
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