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A metal-based microencapsulated phase change material (MEPcM) with high thermal reliability and its performance regulation

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cOMPOSITES PART A-APPLIED ScIENcE AND MANUFAcTURING 2023年第1期168卷

作者： Lei, Ke Wang, Shuo Wang, Zhiyuan Wang, Hao Zou, Deqiu Ningbo Univ Fac Maritime & Transportat Ningbo 315211 Zhejiang Peoples R China China MCC17 Grp Co Ltd Maanshan 243000 Anhui Peoples R China

An ideal microencapsulated phase change material (MEPcM) should have the characteristics of high thermal reliability, low supercooling degree and high thermal conductivity. Herein, we report a novel metal-based MEPcM with high thermal reliability based on "double-layer coating, sacrificial inner layer" method, solving the problem of MEPcM cracking caused by thermal expansion. Furthermore, synergistic regulation of super-cooling and thermal conductivity was studied by loading nanoparticles into shell. The results showed that the supercooling degree was reduced by 81.8% when the nano-co loading was 0.8%, which achieved the best supercooling suppression effect so far, and the properties kept stable after 200 thermal cycles. Furthermore, thermal performance of MEPcM loaded/unloaded with 0.8% co was compared. The results demonstrated that the MEPcM loaded with 0.8% co showed a 12.6% increase in thermal conductivity and a faster thermal response rate. This paper provides a novel strategy for the preparation and performance regulation of metal-based MEPcM.

关键词： Microencapsulated phase change material (MEPcM) A Metal-matrix composites (MMcs) B Thermal properties c Micro-mechanics

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Magnetic and vibrational amplitude dependences of MRE grid composite sandwich plates

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INTERNATIONAL JOURNAL OF MEcHANIcAL ScIENcES 2023年 241卷

作者： Li, Hui Wang, Xintong Dai, Zhihan Xia, Yuen Ha, Sung Kyu Wang, Xiangping Ren, Yunpeng Han, Qingkai Wu, Haihong Northeastern Univ Sch Mech Engn & Automat Shenyang 110819 Peoples R China Hanyang Univ Dept Mech Convergence Engn Seoul 133791 South Korea Key Lab Impact Dynam Aero Engine Shenyang 110015 Peoples R China Shenyang Jianzhu Univ Sch Mech Engn Shenyang 110168 Peoples R China Henan Univ Technol Int Joint Lab Carbon Fibre Composites Henan Zhengzhou 450001 Henan Peoples R China

In this work, both magnetic and vibration amplitude dependent properties of magnetorheological elastomer (MRE) grid composite sandwich plates (MREGcSPs) are investigated. Initially, to prove such a nonlinearly dependent phenomenon, a series of characterization tests are performed on the MREGcSP specimens with different magnetic field intensities and base vibrational amplitudes. Then, using the Jones-Nelson nonlinear material theory, the strain energy density function method, the complex modulus approach, and the Biot-Savart law, the nonlinear material assumption of MRE is defined. A theoretical model consisting of an MRE grid core and two fiber-reinforced polymer (FRP) skins is also proposed to obtain the solutions for the nonlinear frequency, damping, and vibration response parameters, which is based on the modified first-order shear deformation theory, the energy principle, the eigenvalue increment method, the Newmark- beta approach, etc. Finally, a detailed comparison of magnetic and vibrational amplitude dependent natural frequencies, loss factors, and vibration responses is performed to confirm the effectiveness and superiority of the current model over a linear model. This provides a solid basis to reveal the nonlinear dynamic mechanism of the studied smart structure subjected to complex excitation loads. Also, some practical suggestions are summarized for improving its active vibration control capability.

关键词： A nonlinear vibration B vibrational amplitude dependence c magnetic amplitude dependence D magnetorheological elastomer E composite sandwich plate

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Key essential oil components delocalize candida albicans Kar3p and impact microtubule structure

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MIcROBIOLOGIcAL RESEARcH 2023年 272卷 127373页

作者： Shahina, Zinnat Yennamalli, Ragothaman M. Dahms, Tanya E. S. Univ Regina Dept Chem & Biochem Regina SK S4S 0A2 Canada SASTRA Deemed Be Univ Sch Chem & Biotechnol Dept Bioinformat Thanjavur 613401 India

Background: Treatment of candida albicans associated infections is often ineffective in the light of resistance, with an urgent need to discover novel antimicrobials. Fungicides require high specificity and can contribute to antifungal resistance, so inhibition of fungal virulence factors is a good strategy for developing new antifungals. Objectives: Examine the impact of four plant-derived essential oil components (1,8-cineole, alpha-pinene, eugenol, and citral) on c. albicans microtubules, kinesin motor protein Kar3 and morphology. Methods: Microdilution assays were used to determine minimal inhibitory concentrations, microbiological assays assessed germ tube, hyphal and biofilm formation, confocal microscopy probed morphological changes and localization of tubulin and Kar3p, and computational modelling was used to examine the theoretical binding of essential oil components to tubulin and Kar3p. Results: We show for the first time that essential oil components delocalize the Kar3p, ablate microtubules, and induce psuedohyphal formation with reduced biofilm formation. Single and double deletion mutants of kar3 were resistant to 1,8-cineole, sensitive to alpha-pinene and eugenol, but unimpacted by citral. Strains with homo-zygous and heterozygous Kar3p disruption had a gene-dosage effect for all essential oil components, resulting in enhanced resistance or susceptibility patterns that were identical to that of cik1 mutants. The link between microtubule (alpha beta-tubulin) and Kar3p defects was further supported by computational modeling, showing pref-erential binding to alpha beta-tubulin and Kar3p adjacent to their Mg2+-binding sites. conclusion: This study highlights how essential oil components interfere with the localization of the kinesin motor protein complex Kar3/cik1 and disrupt microtubules, leading to their destabilization which results in hyphal and biofilm defects.

关键词： Biofilm inhibition c albicans cik1p Microtubules Plant-based essential oil components Pseudohyphae Kar3p

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Photoaged microplastics induce neurotoxicity associated with damage to serotonergic, glutamatergic, dopaminergic, and GABAergic neuronal systems in caenorhabditis elegans

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ScIENcE OF THE TOTAL ENVIRONMENT 2023年第1期900卷 165874页

作者： Yu, Yunjiang Tan, Shihui Xie, Dongli Li, Hongyan chen, Haibo Dang, Yao Xiang, Mingdeng Minist Ecol & Environm South China Inst Environm Sci State Environm Protect Key Lab Environm Pollut Hlt Guangzhou 510655 Peoples R China China Med Univ Sch Publ Hlth Shenyang 110122 Liaoning Peoples R China Shanghai Univ Inst Environm Pollut & Hlth Sch Environm & Chem Engn Shanghai 200444 Peoples R China Chongqing Three Gorges Univ Coll Environm & Chem Engn Wanzhou 404100 Peoples R China

Microplastics (MPs) are ubiquitous environmental contaminants that cause neurotoxicity in various organisms. MPs are typically affected by light irradiation and undergo photoaging. However, the neurotoxic effects of photoaged polystyrene (P-PS) and its underlying mechanisms remain unclear. In this study, locomotion behaviors, neuronal development, neurotransmitter levels, and the expression of neurotransmission-related genes were investigated in caenorhabditis elegans exposed to P-PS at environment-relevant concentrations (0.1-100 & mu;g/ L). The characterization results showed that photoaging accelerated the aging process and changed the physicochemical properties of the MPs. The toxicity results suggested that exposure to 1-100 & mu;g/L P-PS caused more severe neurotoxicity than virgin polystyrene (V-PS) with endpoints of head thrashes, body bends, wavelength, and mean amplitude. Exposure to P-PS also altered the fluorescence intensity and neurodegeneration percentage of serotonergic, glutamatergic, dopaminergic, and aminobutyric acid (GABA) in transgenic nematodes. Similarly, significant reductions in the levels of these neurotransmitters were also observed. Based on Pearson's correlation, locomotion behaviors were negatively correlated with the neurotransmission of serotonin, glutamate, dopamine, and GABA. Further investigation suggested that the expression of neurotransmitter-related genes (e.g., tph-1, eat4, and unc-46) was significantly altered in the nematodes. collectively, the neurotoxic effects of P-PS were attributed to abnormal neurotransmission. This study highlights the potential toxicity of MPs photoaged under environmentally relevant conditions.

关键词： c elegans Photoaging Polystyrene Neurotoxicity Neurotransmission

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Multigenerational effects of co-exposure to dimethylarsinic acid and polystyrene microplastics on the nematode caenorhabditis elegans

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ENVIRONMENTAL ScIENcE AND POLLUTION RESEARcH 2023年第36期30卷 85359-85372页

作者： Muller, Larissa Josende, Marcelo Estrella Soares, Gabriela correa Monserrat, Jose Maria Ventura-Lima, Juliane Univ Fed Rio Grande FURG Inst Ciencias Biol ICB Av ItaliaKm 08 BR-96201900 Rio Grande RS Brazil Programa Posgrad Ciencias Fisiol FURG Rio Grande RS Brazil

In the current study, we assessed the impact of DMA (dimethylarsinic acid) and MPs (microplastics) interactions in c. elegans over the course of five generations. We found that the redox state of the organisms changed over generations as a result of exposure to both pollutants. From the third generation onward, exposure to MPs reduced GST activity, indicating reduced detoxifying abilities of these organisms. Additionally, dimethylarsinic exposure decreased the growth of organisms in the second, fourth, and fifth generations. In comparison to isolated pollutants, the cumulative effects of co-exposure to DMA and MPs seem to have been more harmful to the organisms, as demonstrated by correlation analysis. These findings demonstrate that DMA, despite being considered less hazardous than its inorganic equivalents, can still have toxic effects on species at low concentrations and the presence of MPs, can worsen these effects.

关键词： c elegans Multigenerational Dimethylarsinic acid Microplastic co-exposure Ecotoxicology

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composition of organic matter-iron-phosphorus associations in sediments of algae- and macrophyte-dominated zones in Lake Taihu

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cHEMIcAL GEOLOGY 2023年第1期622卷

作者： Liu, Jingjing Zhang, Qiaoying chen, Meilian Dai, Jiaru Gu, Wenxin Wen, Shuailong Du, Yingxun Chinese Acad Sci Nanjing Inst Geog & Limnol State Key Lab Lake Sci & Environm Nanjing 210008 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Western Carolina Univ Dept Geosci & Nat Resources Cullowhee NC 28723 USA Nanjing Tech Univ Sch Environm Sci & Engn Nanjing 210008 Peoples R China Hohai Univ Coll Hrdrol & Water Resources Nanjing 210024 Peoples R China

The biogeochemical cycles of phosphorus (P) and organic matter (OM) are significantly influenced by iron (Fe) through forming OM-Fe-P associations. The sources and compositions of organic matter in the two typical states (algae-dominated and macrophyte-dominated) of shallow lakes are different, which could modulate the for-mation of OM-Fe-P associations and influence the internal loadings of P in lakes. In this study, OM and P bound with Fe were extracted from the sediments of algae-dominated zone (A-zone) and macrophyte-dominated zone (M-zone) in Lake Taihu via the citrate-bicarbonate-dithionite (cBD) reduction method, and were analyzed to elucidate the differences in OM-Fe-P associations between the two zones. The results showed that OM-Fe-P as-sociations in the sediments of M-zone had higher a molar c/Fe ratio but a lower molar P/Fe ratio. Four com-ponents identified by excitation-emission matrix fluorescence coupled with parallel factor analysis (EEM-PARAFAc) in OM-Fe-P associations in the two zones were all humic-like substances and the relative abundance of the corresponding PARAFAc components had no significant difference between the two zones. However, the total fluorescence intensity of the humic-like components was higher in M-zone than those in A-zone. This could be attributed to the higher aromaticity of OM produced from macrophyte than that from algae, as evidenced by the difference in the easily-desorbed OM between two zones. In M-zone, high aromatic compounds which are preferentially associated with Fe, could be more produced from macrophyte plants than from algae and resulted in the higher c/Fe molar ratio. The higher c/Fe molar ratio (2.1 +/- 0.9) of OM-Fe-P associations in M-zone reflected that more OM originated from macrophyte could be involved in the coprecipitation with Fe (III) and OM-Fe-P associations in M-zone were probably more resistant to the microbial and chemical reduction. Our results from the real situation confirmed the mechanism rel

关键词： citrate-bicarbonate-dithionite (cBD) reduction c Fe molar ratio EEM-PARAFAc Organic matter composition Phosphorus internal loading

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Tuning the active interface in TiO2 thin film-based memristors prepared by PVD

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cERAMIcS INTERNATIONAL 2023年第9期49卷 14563-14570页

作者： Kleiman, A. Peralta, c. Abinzano, I. Vega, D. Halac, E. Marques, A. Acha, c. Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Fis Ciudad Univ Pab 1 RA-1428 Buenos Aires Argentina Univ Buenos Aires CONICET Inst Fis Plasma INFIP Ciudad Univ Pab 1 RA-1428 Buenos Aires Argentina Comis Nacl Energia Atom Dept Fis Mat Condensada Gerencia Invest & Aplicac Ave Gral Paz 1499 RA-1650 San Martin Buenos Aires Argentina Univ Nacl San Martin Escuela Ciencia & Tecnol San Martin Buenos Aires Argentina Univ Buenos Aires CONICET Inst Fis Buenos Aires IFIBA Ciudad Univ Pab 1 RA-1428 Buenos Aires Argentina

In this work, the resistive switching and the conducting mechanism of forming-free TiO2 thin films between Ti and Pt electrodes were investigated. The devices were fabricated employing Physical Vapor Deposition (PVD) methods. Ti/TiO2 films were prepared with a cathodic arc system while Pt contacts were deposited by sputtering. Different TiO2 structures (amorphous, anatase, rutile) and thicknesses (60-240 nm) were analyzed through current-voltage (IV) characteristic curves and resistance hysteresis switching loops (RHSL). Amorphous TiO2 produced more conductive devices, with a circulation path, both in IV and RHSL, opposite to that of crystalline TiO2. From these results, the TiO2-Ti was found to be the active interface in devices based on the amorphous phase, while the Pt-TiO2 interface was the active one for anatase and rutile. The results showed that the selection of the TiO2 growth conditions allows to tune which will be the active interface that produces the resistive changes by choosing the structure of the films, as well as the degree of non-linearity of the electrical conduction of the device by varying the thickness of the TiO2 (anatase) film.

关键词： A Films c Electrical properties D TiO2 Resistive switching

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The relationship between electric processing condition and microstructure in the solidification of multicomponent oxides

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cERAMIcS INTERNATIONAL 2023年第12期49卷 20096-20103页

作者： Bhagurkar, Ashutosh Qin, Rongshan Open Univ Sch Engn & Innovat Walton Hall Milton Keynes MK7 6AA England

Systematic characterization for the relationship between the electropulse processing conditions and microstructure has been carried out in the present work. It is found that electropulse can refine porosity and alter grain morphology considerably. A processing with optimum electropulsing parameters can reduce over 75% volume fraction of porosity and more than 70% average pore diameter in comparison with that of reference sample without electric treatment. Electric current treatment promotes the growth of dendrites with smaller thickness of primary arms dendrite and prevents the liquid entrapping between the growing solid grains. The former is caused by the effect of electricity-enhanced kinetic mobility on the radius of curvature at the tip of dendrite. The latter is attributed to the effects of electric thermodynamics on the microstructural formation such as the enhanced connectivity of conductive phase. The microstructures obtained by electropulsing treatment are favourable for heat conduction, structural strength and crack prohibition. However, the excess pulse frequency and pulse width can generate unwanted heat to counteract electric effect. The research reveals the relationship between electric processing conditions and microstructure in a perfectly controversial solidification condition in oxide materials to that of the metals and alloys. The results confirm from the opposite side the validity of the pulsated solidification.

关键词： A Grain growth B Porosity c Thermal conductivity E Refractories

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Water-driven expansion of boron nitride nanosheets for self-healing tobermorite composite

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cOMPOSITES ScIENcE AND TEcHNOLOGY 2023年 235卷

作者： Liu, Jialin Hu, Ning chow, cheuk Lun Lau, Denvid City Univ Hong Kong Dept Architecture & Civil Engn Hong Kong Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China

The water-driven expansion of folded BNNSs on the surface of the tobermorite is studied by molecular dynamics simulation. It shows that the expansion of folded BNNSs is significantly dependent on the deterioration of water molecules on the interfacial interactions between the folded BNNSs and tobermorite and between interlayers of the folded BNNSs. The interface deteriorations allow the relative sliding between folded BNNSs and tobermorite and between interlayers of folded nanosheets. Afterward, the vibration of the monolayered BNNS induces expansion due to its flexibility. To quantify the deterioration of the adhesion between folded BNNSs and tobermorite and between interlayers of folded BNNSs, steered molecular dynamics simulations are performed to calculate the energy barrier between them. It indicates that the presence of water molecules significantly reduces the energy barrier, resulting in the release of strain energy in folded BNNSs and the expansion behavior of BNNSs. Due to the presence of water, the hydration of unhydrated cement particles occurs and releases heat. Hence, the effect of temperature on the expansion degree of BNNS is studied, which shows an acceleration in the expansion degree of BNNS and envisions the self-healing of cracks in the tobermorite composite when the temperature is increased.

关键词： A Graphene and other 2D-materials Nano composites B Interface self -healing c Molecular dynamics

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Radical-promoted single-unit monomer insertion (SUMI) [ aka. reversible-deactivation radical addition (RDRA)]

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PROGRESS IN POLYMER ScIENcE 2023年第1期138卷

作者： Boyer, cyrille Kamigaito, Masami Satoh, Kotaro Moad, Graeme UNSW Australia Cluster Adv Macromol Design CAMD Sydney NSW 2052 Australia Nagoya Univ Grad Sch Engn Dept Mol & Macromol Chem Furo ChoChikusa Ku Nagoya 4648603 Japan Tokyo Inst Technol Sch Mat Chem Technol Dept Chem Sci & Engn 2-12-1 OokayamaMeguro Ku Tokyo 1528550 Japan CSIRO Mfg Clayton Vic 3168 Australia

We survey progress in the development of the processes for radical-promoted single-unit monomer in-sertion (SUMI) or reversible deactivation radical addition (RDRA), focussing on aminoxyl-[nitroxide-] me-diated SUMI (NM-SUMI), reversible-addition-fragmentation chain transfer-SUMI (RAFT-SUMI) , atom -transfer radical addition (ATRA). Radical-promoted thiol-ene processes are also briefly discussed. We de-tail the strategies for achieving selectivity with respect to single unit insertion vs oligomerization and look critically at progress towards discrete oligomer synthesis by consecutive SUMI reactions. We exam-ine the use of SUMI to install alpha-, omega- or mid-chain-functionality in RDRP-synthesized polymers. Finally, we examine the prospects for using radical-promoted SUMI in the synthesis of sequence-defined poly-mers where monomer placement is precisely defined to the level of the individual monomer units in the polymer chain.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the cc BY-Nc-ND license ( http://***/licenses/by-nc-nd/4.0/ )

关键词： The abbreviation used for poly() is P. Thus poly(butyl acrylate) is abbreviated as PBA. The IUPAc recommended names for some terms or compounds are provided within brackets ADMET acyclic diene metathesis polymerization AIBN azobis(isobutyronitrile) [( E )-2,2’-(diazene-1,2-diyl)bis(2-methylpropanenitrile)] AN acrylonitrile ATRA atom-transfer radical addition ATRP atom-transfer radical polymerization BA butyl acrylate BBTc benzyl butyl trithiocarbonate [benzyl butyl carbonotrithioate] BMDO 5,6-benzo-2-methylene-1,3-dioxepane c tr transfer coefficient DBHN di- tert -butyl hyponitrite [( E )-1,2-di- tert -butoxydiazene] Dcc N,N -dicyclohexylcarbodiimide ccETPA 4-((((2-carboxyethyl)thio)carbonothioyl)thio)-4-cyanopentanoic acid (Fig. 1) cETPA 4-(((ethylthio)carbonothioyl)thio)-4-cyanopentanoic acid (Fig. 1) cDTPA 4-cyano-4-(((dodecylthio)carbonothioyl)thio)pentanoic acid (Fig. 1) cPADB 4-cyano-4-((phenylcarbonothioyl)thio)pentanoic acid (Fig. 1) cPBTc (2-cyanopropan-2-yl) butyl trithiocarbonate [butyl (2-cyanopropan-2-yl) carbonotrithioate] DB dithiobenzoate [benzodithioate] DBPOX di- tert -butyl peroxyoxalate [di-tert-butyl ethanebis(peroxoate)] DMAm N,N -dimethylacrylamide DMAEA 2-(dimethylamino)ethyl acrylate DTBN N,N -di- tert -butylnitroxide [ N,N -di- tert -butylaminoxyl] (Table 2) ESI-MS electrospray ionization mass spectrometry EtOH ethanol HEA 2-hydroxyethyl acrylate iBoA isobornyl acrylate k p homopropagation rate coefficient LAM less-activated monomer LPO lauroyl peroxide M monomer MA methyl acrylate MAA methacrylic acid MADIX macromolecular design by interchange of xanthate MAH maleic anhydride MAM more-activated monomer MMA methyl methacrylate NIPAm N -isopropylacrylamide NMP nitroxide-mediated polymerization [aminoxyl-mediated polymerization] NM-SUMI nitroxide-mediated – single-unit monomer insertion NPMI N -phenylmaleimide NVP N -vinylpyrrolidone PcL polycaprolactone PEO poly(ethylene oxide) PET photo- electron or energy transfer PLA poly(lactic acid) RAFT reversible-addition-fragmentation chain transf

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