Article
Engineering, Multidisciplinary
Gang Jian, Yong Jiao, Qingzhen Meng, Liang Feng, Zhongxian Yan, Chao Yan, Chen Zhang, Kyoung-Sik Moon, Ching-Ping Wong
Summary: This study introduces a high Ag loading (60%) BaTiO3 (BT) composite with a stable structure achieved using core-shell Ag@BT particles. The composite exhibits a high thermal conductivity of 84 W/mK at 25 degrees C, 35 times higher than that of BT ceramic. The unique composite architecture results in low thermal barrier resistances and nonpercolative behavior, making it suitable for various heat dissipation applications.
COMPOSITES PART B-ENGINEERING
(2021)
Review
Chemistry, Applied
Wei Wang, Lei He, Qunxing Luo, Linyang Wang, Jing Wang, Huiyong Chen, Zongcheng Miao, Qiuxiang Yao, Ming Sun
Summary: Research on the synthesis of zeolite molecular sieves focuses on manipulating their properties by adjusting particle size, composition, and morphology. The core and shell concept particles, which integrate multiple functions into a single shape, have been extensively studied. This article presents novel design strategies for zeolite-related core and shell concept particles and their application in conventional thermal catalysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Review
Chemistry, Analytical
Tiantian Si, Xiaofeng Lu, Haixia Zhang, Shuai Wang, Xiaojing Liang, Yong Guo
Summary: This review provides a brief summary of the performances and recent applications of metal-organic frameworks (MOFs) based core-shell composites as stationary phases in high-performance liquid chromatography. It also discusses in detail the application of MOF-based composites for separating analytes under different conditions.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Yujing Zhang, Yilin Zhang, Yuping Li, Minhao Yao, Xuefei Miao, Chuyang Liu, Huikun Zhao, Yanyan Shao, Feng Xu
Summary: BaTiO(3)pC nanoparticles with a core-shell nanostructure were successfully synthesized through a facile hydrothermal and dopamine carbonization process, demonstrating excellent microwave absorption properties. The formation of dense heterogeneous interfaces and conductive carbon shells on the nanoparticle surfaces enhanced the interfacial polarization, dipole polarization, and conductive loss, resulting in improved microwave absorption performance. This work provides a feasible approach for the efficient production of core-shell-structured nanoparticles with excellent absorption properties.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Shivanshu Goel, Ankit Tyagi, Avesh Garg, Sumit Kumar, Himangshu Bhusan Baskey, Raju Kumar Gupta, Sachin Tyagi
Summary: A novel microwave absorbing composite medium for X-band has been developed by mixing carbon quantum dots coated barium titanate fibers with barium hexaferrite nanoparticles, resulting in improved reflection loss of -25.38 dB. This composite showed enhanced absorption performance with a maximum -10dB bandwidth of 2.7 GHz.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Bastian Haehnle, Philipp A. Schuster, Lisa Chen, Alexander J. C. Kuehne
Summary: A synthetic toolbox has been developed to create monodisperse core-shell and core-shell-shell particles composed entirely of different types of conjugated polymers. Seeded and fed-batch dispersion polymerizations based on Suzuki-Miyaura-type cross-coupling allow precise control over the interface between conjugated polymer phases, facilitating control over energy transfer phenomena. This new approach offers synthetic freedom for fine-tuning the optical properties of CPP, potentially enabling the synthesis of individual white light-emitting particles.
Article
Chemistry, Physical
Rongdi Guo, Guoliang Yu, Mingmin Zhu, Yang Qiu, Guohua Wu, Haomiao Zhou
Summary: This study investigates the improvement of electromagnetic performance of soft magnetic composites (SMCs) by coating FeSiCr metal particles with BaTiO3 dielectric ceramic powder. It was found that with an increase in the BaTiO3 dielectric powder content, the core losses initially decrease and subsequently increase. FeSiCr@BaTiO3 SMC5 with 2.25 wt% BaTiO3 exhibit outstanding comprehensive electromagnetic properties, showing potential for application in high-performance power devices and components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Muhammad Waqas
Summary: A delicate synthesis strategy of Fe2TiO5/Fe2O3 heterostructures was proposed to achieve efficient photocatalytic water oxidation, with the hierarchical structure increasing light absorption depth and promoting the separation of photoinduced excitons, while the high surface area and adequate porosity facilitated the diffusion of electrolyte and adsorption at active sites. Furthermore, the coating of Fe2TiO5/Fe2O3 with graphitic carbon nitride subunits improved photocatalytic water reduction by accelerating the separation of electrons and holes at the contact interface.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Liang Li, Huiling Guo, Huajun Sun, Huiting Sui, Xinyue Yang, Fang Wang, Xiaofang Liu
Summary: In this study, BT@C nanoparticles were successfully synthesized and incorporated into P(VDF-TrFE) solution to obtain PNGs with enhanced piezoelectric response. The carbon shell coating on BT surface improved the dispersion of nanoparticles and facilitated stress transfer at the interface, while enhancing interfacial polarization. The BT@C/P(VDF-TrFE) based PNGs showed higher output voltage, current, and power density compared to BT/P(VDF-TrFE) based PNGs. The flexible PNGs also demonstrated satisfactory sensitivity and durability.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Biomaterials
Atheer Hameid Odda, Tuck-Yun Cheang, Hasan F. Alesary, Lirong Liu, Xiaojun Qian, Naseeb Ullah, Gang Wang, Yueyin Pan, An-Wu Xu
Summary: This study successfully designed and developed a unique photothermal nanocarrier for combination gene therapy and photothermal therapy in cancer treatment. The nanocarrier demonstrated good biocompatibility and enhanced optical absorption, resulting in efficient treatment of breast cancer cells. In vitro and in vivo studies showed significant apoptosis of cancer cells and tumor inhibition when the nanocarrier was used for two different types of breast cancer cells/tumors. This is the first example of utilizing this nanocarrier for highly effective gene and photothermal combination therapy.
JOURNAL OF MATERIALS CHEMISTRY B
(2022)
Article
Chemistry, Inorganic & Nuclear
Lukasz Kilanski, Sabina Lewinska, Anna Slawska-Waniewska, Vladimir B. Pavlovic, Suzana Filipovic
Summary: The studies showed that chemical methods led to the decoration of BaTiO3 grains with hematite nanoparticles, but did not result in a well-defined core-shell structure. The tendency of iron-oxide nanoparticles to form agglomerates reduces the possibility of continuous shell formation around the core.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Oleg Bazaluk, Andrii Hrubiak, Volodymyr Moklyak, Maria Moklyak, Lina Kieush, Bogdan Rachiy, Ivan Gasyuk, Yurii Yavorskyi, Andrii Koveria, Vasyl Lozynskyi, Serhii Fedorov
Summary: This study presents a method for obtaining electrochemically active ultrafine composites of iron oxides, and shows that the presence of chelating agents during hydrothermal synthesis can enhance the electrochemical activity of the materials. The synthesized materials exhibit phase stability and specific discharge capacities with increased Coulomb efficiencies.
Article
Engineering, Electrical & Electronic
K. C. Dhanyaprabha, Bibin Jacob, Manoj Mohan, Imaddin A. Al-Omari, Salim H. Al-Harthi, Myo T. Z. Myint, Hysen Thomas
Summary: Lead-free multiferroic magnetoelectric mixed and core shell composites of BaTiO3 and NiFe2O4 were synthesized by a two-step process. The structural, morphological, electrical, magnetic, and dielectric properties of the samples were investigated. XRD-Rietveld refinement confirmed the co-existence of two phases in the composite. The enhanced remanent polarization of the core shell composite indicates the formation of a core shell structure. The magnetoelectric coupling studies on the core-shell system showed enhancement due to the well-defined interface between the two phases, making it possible for applications in magnetoelectric sensors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Pedro Costa, Rita Policia, Nikola Perinka, Yolanda Alesanco, Ana Vinuales, Estela O. Carvalho, Nelson Pereira, Margarida M. Fernandes, Senentxu Lanceros-Mendez
Summary: In this study, a highly antimicrobial and sensorial material for high traffic surface coatings was developed. The material consists of polyvinylidene fluoride and copper core-shell nanowires, which exhibit strong antimicrobial effects against Escherichia coli and Staphylococcus epidermidis while maintaining biocompatibility with mammalian cells. The addition of copper core-shell nanowires provides antimicrobial activity and suitable mechanical and electrical characteristics for the development of an antimicrobial capacitive touch sensing matrix for interactive surfaces.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Hongjuan Zheng, Xia Li, Kongjun Zhu, Penghua Liang, Meng Wu, Yu Rao, Ran Jian, Feng Shi, Jing Wang, Kang Yan, Jinsong Liu
Summary: The semiconducting BT@C core-shell structured composite prepared via a hydrothermal method showed higher piezo-photodegradation capability for rhodamine B compared to raw BT, due to the combination with semiconductor properties and the piezoelectric effect.
Article
Chemistry, Physical
Georgeta Predeanu, Valerica Slavescu, Marius Florin Dragoescu, Niculina Mihaela Balanescu, Alexandru Fiti, Aurelia Meghea, Petrisor Samoila, Valeria Harabagiu, Maria Ignat, Ana-Maria Manea-Saghin, Bogdan Stefan Vasile, Nicoleta Badea
Summary: This work aimed to recycle lignocellulosic waste to design advanced carbon material precursors for pollution abatement. The waste and precursors were characterized and the precursors were synthesized using innovative microwave heating technology. The precursors exhibited good adsorption properties for environmental pollutants.
Article
Biochemistry & Molecular Biology
Ludmila Motelica, Ovidiu-Cristian Oprea, Bogdan-Stefan Vasile, Anton Ficai, Denisa Ficai, Ecaterina Andronescu, Alina Maria Holban
Summary: In this paper, the synthesis of ZnO nanoparticles (NPs) by forced solvolysis in different alcohols was reported, and the influence of alcohol type (n-butanol, ethylene glycol, and glycerin) on the size and properties of the NPs was studied. The photocatalytic activity of the NPs against a dye mixture and their antibacterial effects were also investigated. The results showed that the NPs exhibited good photocatalytic activity, with degradation efficiency reaching 99.99%, and strong inhibition of bacterial growth, indicating their potential applications in water purification.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Joanna Kisala, Bogdan Stefan Vasile, Anton Ficai, Denisa Ficai, Renata Wojnarowska-Nowak, Tomasz Szreder
Summary: This study presents the degradation of TBBPA using two Fe3O4 magnetic photocatalysts (F1 and F2). The results indicate that both catalysts are effective for the reductive degradation of TBBPA. Quantum chemical calculations show that the degradation process follows the Eley-Rideal mechanism.
Article
Polymer Science
Luminita Predoana, Gabriela Petcu, Silviu Preda, Jeanina Pandele-Cusu, Simona Viorica Petrescu, Adriana Baran, Nicoleta G. Apostol, Ruxandra M. Costescu, Vasile-Adrian Surdu, Bogdan Stefan Vasile, Adelina C. Ianculescu
Summary: Using the microwave-assisted sol-gel method, Zn- and Cu-doped TiO2 nanoparticles with an anatase crystalline structure were prepared. The presence of single-phase anatase and dopants in the nanoparticles was confirmed by XRD and XRF analysis. XPS analysis verified the presence of Ti, O, Zn, and Cu on the surface of the nanoparticles. Cu doping was found to enhance the photocatalytic activity of TiO2 in the visible-light range by narrowing the band-gap energy.
Article
Chemistry, Physical
Larisa Gogianu, Marian C. Popescu, Bogdan S. Vasile, Iuliana Mihalache, Elena M. Anghel, Celina M. Damian, Alexandru Salceanu, Adina Boldeiu, Elena Constantin, Antonio Radoi, Monica Simion, Melania A. Popescu
Summary: Recent studies have shown that human oncoviruses account for 10% of cancer cases worldwide. PCR assays are highly sensitive and specific, while microarrays offer excellent performance for detecting multiple targets simultaneously. However, accurate detection of DNA viruses in microarray systems depends on the platform used, and obtaining high-quality fluorescent-labelled single-stranded DNA is equally important.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Denis Mihaela Panaitescu, Adriana Nicoleta Frone, Cristian-Andi Nicolae, Augusta Raluca Gabor, Dana Maria Miu, Mariana-Gratiela Soare, Bogdan Stefan Vasile, Irina Lupescu
Summary: In this study, poly(3-hydroxybutyrate) (PHB) was blended with medium-chain-length PHAs (mcl-PHAs) as an improvement in flexibility. Nanocellulose (NC) was added as a reinforcing agent. The use of different mcl-PHAs (PHO and PHN) had varied effects on the morphology, thermal, mechanical, and biodegradation behaviors of the PHB, especially with the presence of NC. The addition of mcl-PHAs decreased the storage modulus (E') of PHB blends, but the further addition of NC mitigated this decrease.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Alexandra Elena Stoica (Oprea), Delia Albulet, Alexandra Catalina Birca, Florin Iordache, Anton Ficai, Alexandru Mihai Grumezescu, Bogdan Stefan Vasile, Ecaterina Andronescu, Florica Marinescu, Alina Maria Holban
Summary: In this study, an electrospun nanofibrous mesh based on PVA, chitosan, and usnic acid was fabricated for wound healing. The obtained nanofibers mesh was physicochemically characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). In vitro biological assays were performed to evaluate the antimicrobial properties of the samples using the MIC assay and evaluating the influence of fabricated meshes on the Staphylococcus aureus biofilm development, as well as their biocompatibility (demonstrated by fluorescence microscopy results, an XTT assay, and a glutathione (GSH) assay).
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Alexandra Catalina Birca, Oana Gherasim, Adelina-Gabriela Niculescu, Alexandru Mihai Grumezescu, Ionela Andreea Neacsu, Cristina Chircov, Bogdan Stefan Vasile, Ovidiu Cristian Oprea, Ecaterina Andronescu, Miruna Silvia Stan, Carmen Curutiu, Lia Mara Ditu, Alina Maria Holban
Summary: The use of a microfluidic platform with a cross-shape design was explored in this study for synthesizing silver nanoparticles. The precursor concentration and purging speed were varied as experimental parameters. The obtained samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and dynamic light scattering (DLS). Alginate-based hydrogels containing hyaluronic acid and silver nanoparticles were successfully synthesized and evaluated for their antimicrobial activity and wound treatment efficiency.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Marin Cernea, Roxana Radu, Harvey Amorin, Bogdan Stefan Vasile, Vasile Adrian Surdu, Roxana Trusca, Raluca Gavrila, Carmen Galassi
Summary: Motivated by the goal of developing ultralow power, smart and multifunctional nano (micro) electronic devices, research has shown unwavering interest in synthesis methods, architectures and interphase connectivity of composites containing magnetostrictive and piezoelectric phases, known as magnetoelectric (ME) materials. Herein we report on CoFe2O4/0.92Bi0.5Na0.5TiO3-0.08BaTiO3 biphasic ME composites, obtained by sol-gel chemistry, by mixing the precursor sols of the two phases into one precursor sol and further transforming it into gel, with the goal of obtaining homogeneous nanocomposites with magnetoelectric properties. The structural properties, the temperature dependance of dielectric properties, the magnetic and magnetoelectric properties of these biphasic mixtures, with various molar ratios CoFe2O4/ BNT-BT0.08 = 0.5:1, 1:1 and 1.5:1, are investigated. It is observed that the amount of CoFe2O4 and the synthesis in situ of these composites influences their macroscopic properties showing a high difficulty of carrying out an efficient poling resulting in small piezoelectric and magnetoelectric response. It was concluded that the synthesis procedure, the type of architecture and the interphase connectivity are of outmost importance for magnetoelectric properties based on lead-free materials. (c) 2023 Published by Elsevier B.V.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Roxana-Elena Patru, Catalina Andreea Stanciu, Elena Mirabela Soare, Vasile-Adrian Surdu, Roxana Doina Trusca, Adrian Ionut Nicoara, Bogdan Stefan Vasile, Georgia Boni, Luminita Amarande, Nadejda Horchidan, Lavinia Petronela Curecheriu, Liliana Mitoseriu, Lucian Pintilie, Ioana Pintilie, Adelina-Carmen Ianculescu
Summary: Dense fine-grained Ba0.6Sr0.4TiO3 ceramics were prepared by sol-gel synthesized nanopowders and Spark Plasma Sintering consolidation. The grain size was reduced from 214 nm to 74 nm by changing the SPS parameters. Impedance Spectroscopy revealed diffuse ferroelectric-paraelectric phase transitions and low dielectric permittivity values (<1000) at the Curie temperature (T-C around 280 K) in all sintered ceramics. The reduction in grain size led to a gradual decrease in dielectric constant, tunability, polarization, and storage energy properties. Raman spectroscopy identified the presence of polar nanoclusters above T-C. The observed properties of Ba0.6Sr0.4TiO3 nanostructured ceramics were attributed to the interplay between grain size reduction, the role of low-permittivity grain boundaries, and the diffuse nature of the ferroelectric-to-paraelectric transformation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Adrian Ionut Nicoara, Andrada Elena Alecu, Gabriel-Costin Balaceanu, Eliza Maria Puscasu, Bogdan Stefan Vasile, Roxana Trusca
Summary: This study aimed to obtain porous ceramics based on diopside and akermanite at low sintering temperatures. The ceramic bodies were characterized and analyzed using various methods. The results showed that the ceramic materials had open porosity ranging from 32.5% to 34.6%, with a maximum compressive strength of 11.4 MPa. The cell viability was above 70% and an apatitic phase layer could rapidly develop, making these materials good candidates for use in hard tissue engineering.
Article
Polymer Science
Alexandra Elena Stoica (Oprea), Alexandra Catalina Birca, Dan Eduard Mihaiescu, Alexandru Mihai Grumezescu, Anton Ficai, Hildegard Herman, Balta Cornel, Marcel Rosu, Sami Gharbia, Alina Maria Holban, Bogdan Stefan Vasile, Ecaterina Andronescu, Anca Oana Hermenean
Summary: The majority of the world's PET is used for fiber production (over 60%) and food packaging (30%), making it a major pollutant. This study aims to create and analyze nanostructured membranes made from recycled PET and Fe3O4@UA nanoparticles using electrospinning. The resulting fibers inhibit microbial colonization and biofilm formation, offering potential applications in food packaging and antimicrobial textiles.
Article
Pharmacology & Pharmacy
Ludmila Motelica, Bogdan-Stefan Vasile, Anton Ficai, Adrian-Vasile Surdu, Denisa Ficai, Ovidiu-Cristian Oprea, Ecaterina Andronescu, Gabriel Mustatea, Elena Loredana Ungureanu, Alina Alexandra Dobre
Summary: The overuse of antibiotics leads to the development of drug resistance in microorganisms. Researchers are actively exploring new antimicrobials to overcome this problem. The combination of zinc oxide nanoparticles (ZnO NPs) and essential oils can produce a strong antimicrobial effect and may have potential applications in wound dressings or food packaging.
Article
Polymer Science
Ligia Todan, Luminita Predoana, Gabriela Petcu, Silviu Preda, Daniela Cristina Culita, Adriana Baran, Roxana-Doina Trusca, Vasile-Adrian Surdu, Bogdan Stefan Vasile, Adelina-Carmen Ianculescu
Summary: Magnesium oxide (MgO) was synthesized using sol-gel, microwave-assisted sol-gel, and hydrothermal methods to investigate the effects of preparation conditions on the properties of the products. The samples were characterized using various techniques, such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, etc. The results showed that the MW and HT methods produced MgO particles with higher specific surface areas, but the powders had less-defined morphologies and high levels of aggregation. The photocatalytic activities of the MgO samples towards the degradation of methyl orange under UV light were also evaluated.
Article
Materials Science, Multidisciplinary
Radu Stefan Stirbu, Liliana Mitoseriu
Summary: The hysteretic character of the electromechanic coupling in porous piezoeceramics was investigated using modeling and analysis to determine the relationships between polarization, strain, and porosity. The study calculated the local electrical and mechanical responses and determined effective dielectric and piezoelectric constants. The results showed a nonlinear decrease in polarization and deformation with porosity and discussed the effects of different polarization states on the effective permittivity and piezoelectric constants.
COMPUTATIONAL MATERIALS SCIENCE
(2024)