Materials Letters最新文献_第4页

Structural, magnetic, and dielectric properties of orthorhombic Eu2CoMnO6 double perovskite 正交Eu2CoMnO6双钙钛矿的结构、磁性和介电性能

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-03 DOI: 10.1016/j.matlet.2025.139615

Prachi Joshi , Anchit Modi , Jyoti Shukla , Shivani Khanna Kapoor , Ashutosh Mishra

{"title":"Structural, magnetic, and dielectric properties of orthorhombic Eu2CoMnO6 double perovskite","authors":"Prachi Joshi , Anchit Modi , Jyoti Shukla , Shivani Khanna Kapoor , Ashutosh Mishra","doi":"10.1016/j.matlet.2025.139615","DOIUrl":"10.1016/j.matlet.2025.139615","url":null,"abstract":"<div><div>Polycrystalline Eu₂CoMnO₆ (ECMO) was synthesized via the solid-state route and crystallizes in a high-purity orthorhombic Pbnm phase. Field Emission Scanning Electron Microscope (FESEM) analysis reveals uniform micrometer-sized grains, while Raman spectroscopy confirms characteristic (Co/Mn)O₆ octahedral vibrations, indicating a well-ordered lattice. Magnetic measurements show a ferromagnetic transition at Tc ≈ 89 K, with Curie-Weiss fitting yielding effective magnetic (μ<sub>eff</sub>) ≈ 15.1 μ<sub>B</sub>/f.u. and Curie-Weiss temperature (θ<sub>CW</sub>) ≈ 32 K, consistent with dominant Co<sup>2+</sup>-O<sup>2−</sup>-Mn<sup>4+</sup> superexchange, residual antiferromagnetic (AFM) interactions, and Griffiths-like clusters contributing to local magnetic disorder. M-H loops at 10 K indicate soft ferromagnetism with saturation magnetization (M<sub>s</sub>) ≈ 117.93 emu/g, remanent magnetization (M<sub>r</sub>) ≈ 23.148 emu/g, and coercive field (H<sub>c</sub>) ≈ 0.67 T. Dielectric studies reveal low-frequency interfacial dispersion and a stable high-frequency bulk response. The multifunctional behavior of ECMO arises from the interplay of intrinsic Co<img>Mn ordering and extrinsic microstructural effects.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"404 ","pages":"Article 139615"},"PeriodicalIF":2.7,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defect chemistry of SrFe1−xZrxO3−δ SrFe1−xZrxO3−δ的缺陷化学性质

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139612

M.A. Zavyalov , S.S. Nikitin , O.V. Merkulov , M.V. Patrakeev

引用次数: 0

Ga2O3-graphene oxide hybrid optical sensor ga2o3 -氧化石墨烯混合光学传感器

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139602

Huy-Binh Do , Tuan-Huu Nguyen , Thuy-Hong-Lam Ngo , Anh-Vu Phan-Gia , Thuy Nguyen-Thuy-Ngoc , Thanh-Liem Huynh , Nam Nguyen-Dang

{"title":"Ga2O3-graphene oxide hybrid optical sensor","authors":"Huy-Binh Do , Tuan-Huu Nguyen , Thuy-Hong-Lam Ngo , Anh-Vu Phan-Gia , Thuy Nguyen-Thuy-Ngoc , Thanh-Liem Huynh , Nam Nguyen-Dang","doi":"10.1016/j.matlet.2025.139602","DOIUrl":"10.1016/j.matlet.2025.139602","url":null,"abstract":"<div><div>An optical sensor based on hydrothermally synthesized Ga₂O₃@graphene oxide (GO) composite is fabricated and characterized by various techniques. Scanning Electron Microscopy (SEM) images show Ga₂O₃ attached to GO nanosheets. A marked drop in I<sub>D</sub>/I<sub>G</sub> (0.99 to 0.63) and I<sub>D’</sub>/I<sub>G</sub> (0.41 to 0.33) ratios in the Raman spectra after Ga₂O₃ incorporation into GO indicates effective defect passivation in GO. The Ga₂O₃@GO sensor shows a strong short-wavelength response (I<sub>405nm</sub>/I<sub>650nm</sub> ≈ 5.5 at 45 mW/cm<sup>2</sup>, 10 V), with rise and fall times of 1.55 and 1.89 s under 405 nm, shorter by 21.3 and 13.3 % compared to 650 nm. Responsivity (R) and external quantum efficiency (EQE) reach 2.91 A/W and 892 % respectively, surpassing electrochemically exfoliated GO-based photodetectors, with R ∼ 580 times higher than the values reported in prior studies at comparable response times. The W/Ti/Ga₂O₃@GO photodetector exhibits a Schottky barrier of 0.42 eV and an ideality factor of ∼6, indicating tunneling-dominated transport at the Ga₂O₃/GO heterojunction.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"404 ","pages":"Article 139602"},"PeriodicalIF":2.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating machine-learning and nanotechnology: imatinib-loaded nanomicelles for targeted therapy in MCF-7 breast cancer 整合机器学习和纳米技术：装载伊马替尼的纳米胶束用于MCF-7乳腺癌的靶向治疗

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139596

Abbas Rahdar , Sonia Fathi-karkan , Mohammad Javad Javid-Naderi , M. Ali Aboudzadeh

{"title":"Integrating machine-learning and nanotechnology: imatinib-loaded nanomicelles for targeted therapy in MCF-7 breast cancer","authors":"Abbas Rahdar , Sonia Fathi-karkan , Mohammad Javad Javid-Naderi , M. Ali Aboudzadeh","doi":"10.1016/j.matlet.2025.139596","DOIUrl":"10.1016/j.matlet.2025.139596","url":null,"abstract":"<div><div>Using machine-learning (ML) algorithms, we developed and characterized imatinib-loaded nanomicelles to enhance tumor-targeted delivery and reduce systemic toxicity. Nanomicelles were synthesized via an F127-mediated oil-in-water self-assembly process, achieving 65 % encapsulation efficiency and a uniform particle size of 257 nm. In-vitro studies showed pronounced pH-responsive release, with accelerated drug liberation at acidic pH (5.4) mimicking the tumor microenvironment and sustained release at physiological pH (7.4). To analyse release kinetics, we applied a supervised ML framework across eight regression algorithms. XGBoost delivered the best accuracy (R<sup>2</sup> = 0.998, MAE = 0.87) with strong cross-validation (CV, R<sup>2</sup> = 0.994). Modeling revealed 38–42 % faster release at pH 5.4, with time–pH interaction explaining 72 % of kinetic variability. These in-vitro results suggest that nanomicelles enable pH-triggered release and that ML can predict release kinetics, warranting further validation in biological systems.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"404 ","pages":"Article 139596"},"PeriodicalIF":2.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and experimental validation of a low-temperature toughness-oriented welding wire for 690 MPa steel via BP neural network modeling 基于BP神经网络建模的690mpa钢低温韧性定向焊丝设计与试验验证

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139584

Liyin Zheng , Zhihua Wang , Yuhang Ma , Tongbang An , Chengyong Ma , Zhilong Cao

{"title":"Design and experimental validation of a low-temperature toughness-oriented welding wire for 690 MPa steel via BP neural network modeling","authors":"Liyin Zheng , Zhihua Wang , Yuhang Ma , Tongbang An , Chengyong Ma , Zhilong Cao","doi":"10.1016/j.matlet.2025.139584","DOIUrl":"10.1016/j.matlet.2025.139584","url":null,"abstract":"<div><div>To meet the stringent requirements for strength and toughness of welded joints in high-strength steel structures operating under extreme low-temperature conditions, this study proposes an intelligent alloy design method for 690 MPa-class low-temperature high-toughness welding wire based on a BP neural network. A dataset comprising 104 sets of welding wire compositions and corresponding impact energy values at −50 °C was collected. A predictive model was constructed using alloying elements as input variables and low-temperature impact toughness as the output target. The model was optimized through training with a Bayesian regularization algorithm. Based on multiple performance metrics, the most accurate model structure was selected to predict the optimal composition range for the welding wire. Experimental wires were fabricated according to the predicted compositions and subjected to welding trials using the gas metal arc welding process. The results demonstrated that the deposited metal primarily consisted of acicular ferrite with refined grain structures, exhibiting excellent mechanical properties. The average impact energy at −50 °C reached 87 J, closely matching the predicted value. Further analyses using TEM, EBSD, and XRD revealed a synergistic enhancement mechanism involving microstructural refinement and carbide strengthening. This work indicates that the proposed method offers promising potential for the intelligent design of welding wires with well-balanced high strength and toughness.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"404 ","pages":"Article 139584"},"PeriodicalIF":2.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon dots-based nanoparticles with room-temperature long afterglow in aqueous solution 在水溶液中具有室温长余辉的碳点基纳米颗粒

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139610

Yijie Zhong , Yikai Chen , Lijun Xie , Jianping Yang , Chaofan Hu , Qingqing Liu

引用次数: 0

Synthesis and quaternization of poly(vinyl benzyl chloride-co-3-(methacryloyloxy)propyl] trimethoxy silane) for inhibiting bacterial growth on dental implants 抑制牙种植体细菌生长的聚（乙烯基苄氯-co-3-（甲基丙烯酰氧基）丙基）三甲氧基硅烷的合成与季铵化

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139578

K.N. Tahsin , W.Z. Xu , D. Watson , A. Rizkalla , P.A. Charpentier

{"title":"Synthesis and quaternization of poly(vinyl benzyl chloride-co-3-(methacryloyloxy)propyl] trimethoxy silane) for inhibiting bacterial growth on dental implants","authors":"K.N. Tahsin , W.Z. Xu , D. Watson , A. Rizkalla , P.A. Charpentier","doi":"10.1016/j.matlet.2025.139578","DOIUrl":"10.1016/j.matlet.2025.139578","url":null,"abstract":"<div><div>Dental implants are widely used to treat tooth loss, but because their surface is exposed to the oral environment, they are vulnerable to microbial colonization. To combat this, recent efforts have focused on engineering implant surfaces with antimicrobial properties. This work involved the synthesis of an antimicrobial coating by quaternizing the copolymer of vinylbenzyl chloride (VBC) and [3-(Methacryloyloxy)propyl]trimethoxy silane (MPS) of varying alkyl chain lengths. The MPS-VBC copolymer was synthesized using free radical polymerization, and quaternized to form ammonium salts of varying chain length (<em>n</em>): <em>Trimethylamine (n</em> <em>= 1)</em>, <em>Triethylamine</em> (<em>n</em> <em>=</em> <em>2</em>) and <em>N,N -Dimethyl octylamine</em> (<em>n = 8</em>). The quaternized ammonium salts (QAS) were characterized using <sup>1</sup>H NMR and FTIR spectroscopies. The antimicrobial effects of the QAS having different chain lengths were tested against both grampositive and gram-negative bacteria using different concentrations. The QAS with a chain length of <em>n</em> <em>=</em> <em>8</em> achieved a 99.9999 % reduction in <em>E. coli</em> and <em>S. agalactiae</em>, and a 99.99 % reduction in <em>S. aureus</em>. In contrast, QAS with shorter chain lengths <em>(n</em> <em>=</em> <em>1,2</em>) showed no reduction in bacterial cells. The minimum inhibitory concentration (MIC) was found to be less than 10 mg/mL for all strains used in this study. The toxicity of our synthesized QAS was evaluated using Glutathione S-transferase (GST) activity. The QAS showed no cytotoxicity at MIC and MBC concentrations. This study opens pathways for using QAS in dental and oral pathways as they proved to be non-toxic when used orally.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"404 ","pages":"Article 139578"},"PeriodicalIF":2.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing PEEK composites: A study of thermal, tribological, and mechanical behavior in TiB2-modified systems 设计PEEK复合材料：tib2改性体系的热、摩擦学和力学行为研究

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139601

Siddheshvar Vilas Solunke , Kshitija Vaidya , Pulla Sammaiah , Balasubramanian Kandasubramanian , Satheesh Kumar Kondapart , Pankaj K. Bhujbal

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A novel porous electrochemical platform for dexamethasone detection and delivery to alleviate Pyroptosis in acute lung injury 一种新型的多孔电化学平台用于地塞米松检测和递送以减轻急性肺损伤的焦亡

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-10-02 DOI: 10.1016/j.matlet.2025.139604

Lili Jiang , Yan Shen , Fei Hao , Luming Zhu

引用次数: 0

WO₃@CdS Core-Shell heterojunction for Noble-metal-free cooperative photocatalytic H₂ evolution and benzyl alcohol oxidation 无贵金属协同光催化H₂演化和苯甲醇氧化的WO₃@CdS核壳异质结