Pub Date : 2025-02-27DOI: 10.1007/s10971-025-06707-7
Damar Nurwahyu Bima, Ayu Sri Wahyuni, Adi Darmawan, Purbowatiningrum Ria Sarjono
The synthesis route and matrix material source play a crucial role in determining the characteristics and bioactivity of a composite. This study focuses on synthesizing a PANI/Silica-Coated Magnetite composite with variations in synthesis methods and silica sources. The in situ method involves polymerizing polyaniline within a silica gel containing magnetite, while the ex situ method incorporates pre-formed polyaniline into a silica gel through a sol-gel condensation reaction. Two silica sources, Na2SiO3 and Tetraethyl Orthosilicate (TEOS), were utilized. FTIR analysis confirmed the successful polymerization of PANI, as evidenced by an absorption peak at 1110 cm−1, indicating the vibration of C-N bonds attached to aromatic amines. Vibrating Sample Magnetometer (VSM) analysis demonstrated that the PANI composite containing magnetite exhibited magnetic properties, unlike pure PANI. Additionally, TGA characterization revealed that the composite possessed enhanced thermal stability compared to pure PANI. Bioactivity tests against E. coli, S. aureus, and C. albicans showed that, overall, composites synthesized using the in situ method exhibited superior bioactivity compared to those synthesized via the ex situ method. Among them, the In Situ PANI/TEOS-Magnetite (IPTM) composite showed the most effective antibacterial and antifungal activity.
Graphical Abstract
合成路线和基质材料来源在决定复合材料的特性和生物活性方面起着至关重要的作用。本研究的重点是通过不同的合成方法和二氧化硅来源合成 PANI/二氧化硅包覆磁铁矿复合材料。原位法是在含有磁铁矿的硅凝胶中聚合聚苯胺，而非原位法则是通过溶胶-凝胶缩合反应将预先成型的聚苯胺加入硅凝胶中。使用了两种硅源，即 Na2SiO3 和正硅酸四乙酯（TEOS）。傅立叶变换红外光谱分析证实了 PANI 的成功聚合，1110 cm-1 处的吸收峰表明了芳香胺上 C-N 键的振动。振动样品磁力计（VSM）分析表明，与纯 PANI 不同，含有磁铁矿的 PANI 复合材料具有磁性。此外，热重分析表明，与纯 PANI 相比，该复合材料具有更高的热稳定性。针对大肠杆菌、金黄色葡萄球菌和白僵菌的生物活性测试表明，总体而言，与通过原位法合成的复合材料相比，原位法合成的复合材料具有更高的生物活性。其中，原位 PANI/TEOS-Magnetite (IPTM) 复合材料显示出最有效的抗菌和抗真菌活性。
{"title":"Crafting prospective composites: revealing the influence of synthesis route and silica source on PANI/silica-coated magnetite characteristics and bioactivity","authors":"Damar Nurwahyu Bima, Ayu Sri Wahyuni, Adi Darmawan, Purbowatiningrum Ria Sarjono","doi":"10.1007/s10971-025-06707-7","DOIUrl":"10.1007/s10971-025-06707-7","url":null,"abstract":"<div><p>The synthesis route and matrix material source play a crucial role in determining the characteristics and bioactivity of a composite. This study focuses on synthesizing a PANI/Silica-Coated Magnetite composite with variations in synthesis methods and silica sources. The in situ method involves polymerizing polyaniline within a silica gel containing magnetite, while the ex situ method incorporates pre-formed polyaniline into a silica gel through a sol-gel condensation reaction. Two silica sources, Na<sub>2</sub>SiO<sub>3</sub> and Tetraethyl Orthosilicate (TEOS), were utilized. FTIR analysis confirmed the successful polymerization of PANI, as evidenced by an absorption peak at 1110 cm<sup>−1</sup>, indicating the vibration of C-N bonds attached to aromatic amines. Vibrating Sample Magnetometer (VSM) analysis demonstrated that the PANI composite containing magnetite exhibited magnetic properties, unlike pure PANI. Additionally, TGA characterization revealed that the composite possessed enhanced thermal stability compared to pure PANI. Bioactivity tests against E. <i>coli</i>, S. <i>aureus</i>, and C. <i>albicans</i> showed that, overall, composites synthesized using the in situ method exhibited superior bioactivity compared to those synthesized via the ex situ method. Among them, the In Situ PANI/TEOS-Magnetite (IPTM) composite showed the most effective antibacterial and antifungal activity.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"520 - 531"},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830843","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}
Pub Date : 2025-02-25DOI: 10.1007/s10971-025-06701-z
Hongwei Yan, Ke Yang, Taixiang Liu, Changpeng Li, Lin Huang, Lin Yao, Zhuo Zhang, Yujie Qian
A new method has been developed which can visually display the effect of ultrasonic field in cleaning process. Using colloidal nanoparticles, sol-gel coatings were prepared and subjected to ultrasonic cleaning in water. It was found that periodic patterns appeared in the optical images of the sol-gel coatings. The results from the transmission spectra and atomic force microscopy images demonstrated that the periodic patterns were attributed to the partial removal of the sol-gel coatings. The removal amount of sol-gel coating reflected the spatial distribution of acoustic field in the ultrasonic cleaning tank. A mechanism for the removal of coating composed of nanoparticles was proposed based on experimental observations. In the initial stage, cavitation played a main role in detaching coating, while in the later stage, the movement of cavitation bubbles accelerated coating removal.
Graphical abstract
The graphical abstract shows the optical image of the double-layer silica coating as coated, where color variations in different areas are due to the non-uniformity of the film thickness. After being ultrasonically cleaned at 980 kHz, the optical image clearly shows periodic alternating stripes. The stripe and lattice in the figure reflect the spatial distribution of the acoustic field, with the periodic lattice suggesting the formation of a stable standing wave field in the cleaning tank. The double-layer silica coating was prepared from two silica sols labeled as Sols A and B. TEM images of the colloidal particles shows the Sol A used for the bottom layer of the double-layer coating has an average particle size of approximately 14 nm. And the Sol B used for the top layer of the double-layer coating has an average particle size of approximately 12 nm. The TEM image of the double-layer coating reveals that the double-layer structure has a clear interface between the bottom and top layers. The AFM image of the coating after megasonic cleaning reveals larger pits and through groove. The largest pit has depth of 100 nm and width of 4 μm, while the through groove has depth of 100 nm and maximum width of 6 μm. The profile curve along the white line reveals that there are consistent depths between large pits and grooves.
{"title":"Visualization of ultrasonic fields in cleaning tank by patterns of sol-gel coatings","authors":"Hongwei Yan, Ke Yang, Taixiang Liu, Changpeng Li, Lin Huang, Lin Yao, Zhuo Zhang, Yujie Qian","doi":"10.1007/s10971-025-06701-z","DOIUrl":"10.1007/s10971-025-06701-z","url":null,"abstract":"<div><p>A new method has been developed which can visually display the effect of ultrasonic field in cleaning process. Using colloidal nanoparticles, sol-gel coatings were prepared and subjected to ultrasonic cleaning in water. It was found that periodic patterns appeared in the optical images of the sol-gel coatings. The results from the transmission spectra and atomic force microscopy images demonstrated that the periodic patterns were attributed to the partial removal of the sol-gel coatings. The removal amount of sol-gel coating reflected the spatial distribution of acoustic field in the ultrasonic cleaning tank. A mechanism for the removal of coating composed of nanoparticles was proposed based on experimental observations. In the initial stage, cavitation played a main role in detaching coating, while in the later stage, the movement of cavitation bubbles accelerated coating removal.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>The graphical abstract shows the optical image of the double-layer silica coating as coated, where color variations in different areas are due to the non-uniformity of the film thickness. After being ultrasonically cleaned at 980 kHz, the optical image clearly shows periodic alternating stripes. The stripe and lattice in the figure reflect the spatial distribution of the acoustic field, with the periodic lattice suggesting the formation of a stable standing wave field in the cleaning tank. The double-layer silica coating was prepared from two silica sols labeled as Sols A and B. TEM images of the colloidal particles shows the Sol A used for the bottom layer of the double-layer coating has an average particle size of approximately 14 nm. And the Sol B used for the top layer of the double-layer coating has an average particle size of approximately 12 nm. The TEM image of the double-layer coating reveals that the double-layer structure has a clear interface between the bottom and top layers. The AFM image of the coating after megasonic cleaning reveals larger pits and through groove. The largest pit has depth of 100 nm and width of 4 μm, while the through groove has depth of 100 nm and maximum width of 6 μm. The profile curve along the white line reveals that there are consistent depths between large pits and grooves.</p></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"508 - 519"},"PeriodicalIF":2.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830903","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}
The primary focus for hydrogen (H2) energy production is to develop economical and efficient catalysts. This study described hydrothermal synthesis of samarium (Sm) doped manganese telluride (MnTe) in which Sm-doping significantly improved MnTe’s OER performance in aqueous basic medium (1.0 M KOH). Several investigations revealed that Sm-doped MnTe had an orthorhombic structure, an outstanding surface area of 45 m2/g, and morphology of highly agglomerated nanoparticles. The optimized Sm-doped MnTe demonstrates best OER activity compared to pure MnTe exhibits a reduced OER onset potential of 1.44 V, overpotential (177 mV) at 10 mA/cm2, minimal Tafel value (34 mV/dec), and small charge-transfer resistance (0.06 Ω) respectively. It demonstrates durability over a period of 40 h and retains stability even after completing 3000 cycles. These findings highlight that integration of rare-earth dopant samarium (Sm) into metal tellurides can be effective in improving their performance in optimizing the OER for energy conversion applications.
Graphical Abstract
{"title":"Enhancement of MnTe electrocatalytic properties via Sm doping strategy employed for OER application","authors":"Aqsa Maheen, Sarah A. Alsalhi, Kiran Tahir, Abhinav Kumar, RSK Sharma, Piyus Kumar Pathak, Suman Saini, Vivek Kumar Pandey, Rajesh Haldhar","doi":"10.1007/s10971-025-06670-3","DOIUrl":"10.1007/s10971-025-06670-3","url":null,"abstract":"<div><p>The primary focus for hydrogen (H<sub>2</sub>) energy production is to develop economical and efficient catalysts. This study described hydrothermal synthesis of samarium (Sm) doped manganese telluride (MnTe) in which Sm-doping significantly improved MnTe’s OER performance in aqueous basic medium (1.0 M KOH). Several investigations revealed that Sm-doped MnTe had an orthorhombic structure, an outstanding surface area of 45 m<sup>2</sup>/g, and morphology of highly agglomerated nanoparticles. The optimized Sm-doped MnTe demonstrates best OER activity compared to pure MnTe exhibits a reduced OER onset potential of 1.44 V, overpotential (177 mV) at 10 mA/cm<sup>2</sup>, minimal Tafel value (34 mV/dec), and small charge-transfer resistance (0.06 Ω) respectively. It demonstrates durability over a period of 40 h and retains stability even after completing 3000 cycles. These findings highlight that integration of rare-earth dopant samarium (Sm) into metal tellurides can be effective in improving their performance in optimizing the OER for energy conversion applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"496 - 507"},"PeriodicalIF":2.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830935","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}
In this study, we report the synthesis of cerium-doped gadolinium yttrium aluminum garnet powders with chemical formula Gd2.37Y0.6Al5O12:Ce0.03 via the sol-gel method. The effect of annealing temperature on the stability of the garnet phase was thoroughly investigated. Various characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL), were employed to assess these effects. XRD analysis demonstrated a marked improvement in the stability and crystallinity of the garnet phase with increasing annealing temperatures. FESEM images revealed the evolution of interconnected quasi-spherical particles, with a significant enlargement in average particle size correlating with higher annealing temperatures. PL spectra displayed a broad emission band attributable to Ce³⁺ transitions within the garnet matrix. Notably, the emission intensity exhibited a substantial enhancement with elevated annealing temperatures, which can be attributed to the increased crystallinity and a higher proportion of the garnet phase. These findings underscore the critical role of annealing temperature in optimizing the structural and luminescent properties of Gd2.37Y0.6Al5O12:Ce0.03 nanopowders.
Graphical abstract
The effect of annealing temperature on the stability of the garnet Gd2.37Y0.6Al5O12:Ce0.03 and luminescence, structural, morphological properties.
{"title":"Controlled annealing for enhanced structural stability and luminescence of sol-gel synthesized Gd2.37Y0.6Al5O12: Ce0.03 nanopowders","authors":"Karima Hammoum, Samir Hamrit, Allaoua Boukerika, Lydia Zaidi, Youssef Larbah, Djamel Eddine Kdib","doi":"10.1007/s10971-025-06700-0","DOIUrl":"10.1007/s10971-025-06700-0","url":null,"abstract":"<div><p>In this study, we report the synthesis of cerium-doped gadolinium yttrium aluminum garnet powders with chemical formula Gd<sub>2.37</sub>Y<sub>0.6</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sub>0.03</sub> via the sol-gel method. The effect of annealing temperature on the stability of the garnet phase was thoroughly investigated. Various characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL), were employed to assess these effects. XRD analysis demonstrated a marked improvement in the stability and crystallinity of the garnet phase with increasing annealing temperatures. FESEM images revealed the evolution of interconnected quasi-spherical particles, with a significant enlargement in average particle size correlating with higher annealing temperatures. PL spectra displayed a broad emission band attributable to Ce³⁺ transitions within the garnet matrix. Notably, the emission intensity exhibited a substantial enhancement with elevated annealing temperatures, which can be attributed to the increased crystallinity and a higher proportion of the garnet phase. These findings underscore the critical role of annealing temperature in optimizing the structural and luminescent properties of Gd<sub>2.37</sub>Y<sub>0.6</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sub>0.03</sub> nanopowders.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>The effect of annealing temperature on the stability of the garnet Gd<sub>2.37</sub>Y<sub>0.6</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sub>0.03</sub> and luminescence, structural, morphological properties.</p></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"486 - 495"},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830933","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}
Pub Date : 2025-02-18DOI: 10.1007/s10971-025-06677-w
Yi Huang, Chenyang Zhao, Yue Li, Chen Wang, Wenlin Yuan, Di Cheng, Tao Shen, Ji Zhang, Jie Liu, Qianhong Shen, Hui Yang
The design of hollow porous organosilica nanocontainers (HPON) loaded with corrosion inhibitors offers innovative strategies to enhance the anticorrosive capabilities of sol-gel-derived anticorrosion coatings. In this study, intelligent pH-responsive nanocontainers, termed MBT@HPON, were fabricated using a selective silica etching method, followed by the encapsulation of 2-mercaptobenzothiazole (MBT) through π-π stacking interactions with the organosilica framework. The release kinetics of MBT from the nanocontainers demonstrated that acidic environments reduced the π-π stacking interaction, thereby imparting an acid-responsive release characteristic to the nanocontainers. The total release of MBT reached 69.6% within 24 h at pH = 3, compared to only 14.6% at pH = 7. These nanocontainers were embedded into a silica nanoparticle/methyltrimethoxysilane composite sol-gel coating, creating an intelligent coating system with active and enhanced corrosion protection on 1060 aluminum alloy. Electrochemical impedance spectroscopy analysis indicated that a 0.5 wt% doping content of MBT@HPON exhibited significantly improved electrochemical impedance for the sol-gel coating, with |Z | f=0.01Hz exceeding 4 × 107 Ω·cm2 after 28 d of 3.5 wt% NaCl solution immersion, significantly higher than the pure composite coating. This superior anticorrosive performance can be attributed to the outstanding compatibility between the organosilica shell and the MTMS/silica-based sol-gel coating, along with the active corrosion inhibition from the release of MBT. This work offers valuable insights into the simple construction of sol-gel coatings with enhanced corrosion resistance based on hollow porous organosilica nanocontainers.
Graphical Abstract
{"title":"Sol-gel coating prepared using pH-responsive hollow porous organosilica nanocontainers encapsulating 2-mercaptobenzothiazole for enhanced corrosion resistance of aluminum alloy","authors":"Yi Huang, Chenyang Zhao, Yue Li, Chen Wang, Wenlin Yuan, Di Cheng, Tao Shen, Ji Zhang, Jie Liu, Qianhong Shen, Hui Yang","doi":"10.1007/s10971-025-06677-w","DOIUrl":"10.1007/s10971-025-06677-w","url":null,"abstract":"<div><p>The design of hollow porous organosilica nanocontainers (HPON) loaded with corrosion inhibitors offers innovative strategies to enhance the anticorrosive capabilities of sol-gel-derived anticorrosion coatings. In this study, intelligent pH-responsive nanocontainers, termed MBT@HPON, were fabricated using a selective silica etching method, followed by the encapsulation of 2-mercaptobenzothiazole (MBT) through π-π stacking interactions with the organosilica framework. The release kinetics of MBT from the nanocontainers demonstrated that acidic environments reduced the π-π stacking interaction, thereby imparting an acid-responsive release characteristic to the nanocontainers. The total release of MBT reached 69.6% within 24 h at pH = 3, compared to only 14.6% at pH = 7. These nanocontainers were embedded into a silica nanoparticle/methyltrimethoxysilane composite sol-gel coating, creating an intelligent coating system with active and enhanced corrosion protection on 1060 aluminum alloy. Electrochemical impedance spectroscopy analysis indicated that a 0.5 wt% doping content of MBT@HPON exhibited significantly improved electrochemical impedance for the sol-gel coating, with |Z | <sub>f=0.01Hz</sub> exceeding 4 × 10<sup>7</sup> Ω·cm<sup>2</sup> after 28 d of 3.5 wt% NaCl solution immersion, significantly higher than the pure composite coating. This superior anticorrosive performance can be attributed to the outstanding compatibility between the organosilica shell and the MTMS/silica-based sol-gel coating, along with the active corrosion inhibition from the release of MBT. This work offers valuable insights into the simple construction of sol-gel coatings with enhanced corrosion resistance based on hollow porous organosilica nanocontainers.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"447 - 462"},"PeriodicalIF":2.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830855","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}
Pub Date : 2025-02-17DOI: 10.1007/s10971-025-06696-7
Laleh Sayad Arbabi, Majid Azarang, M. Sookhakian, Wan Jefrey Basirun
This study focuses on the synthesis of molybdenum disulfide (MoS2) nanosheets through a straightforward hydrothermal process, followed by their decoration with silver (Ag) nanoparticles using ammonia (NH3) and glucose (C6H12O6). The resulting nanocomposite was thoroughly characterized using various analytical techniques, including XRD, Raman spectroscopy, TEM, HR-TEM, FE-SEM, EDX, element mapping, XPS, AFM, and BET analysis. The antimicrobial efficacy of the Ag&MoS2 nanocomposite (0D/2D) was evaluated using MIC, MBC, and disk diffusion susceptibility assays in comparison to the antibiotic ampicillin. Notably, the Ag&MoS2 combination demonstrated significant antibacterial activity against Gram-negative bacteria. Specifically, Escherichia coli exhibited the highest efficacy with a 73.02% reduction, while Streptococcus mutans showed the lowest efficacy at 0.05%, primarily due to the physical damage generated by the nanocomposite.
Graphical Abstract
{"title":"The application of molybdenum disulfide nanosheets decorated with silver nanoparticles for antibacterial activity","authors":"Laleh Sayad Arbabi, Majid Azarang, M. Sookhakian, Wan Jefrey Basirun","doi":"10.1007/s10971-025-06696-7","DOIUrl":"10.1007/s10971-025-06696-7","url":null,"abstract":"<div><p>This study focuses on the synthesis of molybdenum disulfide (MoS<sub>2</sub>) nanosheets through a straightforward hydrothermal process, followed by their decoration with silver (Ag) nanoparticles using ammonia (NH<sub>3</sub>) and glucose (C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>). The resulting nanocomposite was thoroughly characterized using various analytical techniques, including XRD, Raman spectroscopy, TEM, HR-TEM, FE-SEM, EDX, element mapping, XPS, AFM, and BET analysis. The antimicrobial efficacy of the Ag&MoS<sub>2</sub> nanocomposite (0D/2D) was evaluated using MIC, MBC, and disk diffusion susceptibility assays in comparison to the antibiotic ampicillin. Notably, the Ag&MoS<sub>2</sub> combination demonstrated significant antibacterial activity against Gram-negative bacteria. Specifically, <i>Escherichia coli</i> exhibited the highest efficacy with a 73.02% reduction, while <i>Streptococcus mutans</i> showed the lowest efficacy at 0.05%, primarily due to the physical damage generated by the nanocomposite.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"463 - 476"},"PeriodicalIF":2.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830906","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}
Taking both advantages of Mn or La doped 0.7BiFeO3-0.3PbTiO3 (BF-PT) thin films, a periodic structured 0.7(Bi0.95La0.05)FeO3-0.3PbTiO3/0.7Bi(Fe0.95Mn0.05)O3-0.3PbTiO3 (BLF-PT/BFM-PT) thin films were deposited on Hastelloy substrates alternatively to achieve excellent dielectric and ferroelectric properties with low leakage current density. La3+or Mn2+ doped BF-PT thin films were deposited on the PbTiO3 (PT) buffered Hastelloy substrates by using the sol-gel method. The comparisons were conducted among undoped BF-PT, BFM-PT, BLF-PT and periodic BLF-PT/BFM-PT thin films in view of the dielectric, ferroelectric and conduction properties. It has been found that La3+or Mn2+ doped BF-PT thin films on Hastelloy maintain good dielectric, ferroelectric and leakage current properties. Particularly, periodic BLF-PT/BFM-PT thin films exhibit the higher dielectric constant (εr) and lower dielectric loss (tanδ) of 266 and 0.058 respectively at frequency of 103 Hz, and the lower leakage current density of 8.66 × 10−8 A/cm2. The conduction mechanism of BFM-PT and periodic BLF-PT/BFM-PT thin films was of ohmic conduction under fields of below 300 kV/cm, while it was of FN tunneling (Fowler Nordheim tunneling) conduction above 62 kV/cm for undoped BF-PT thin films. Moreover, the interfaces of periodic thin films further prevent the transport of carriers, revealing the bulk limitation conduction mechanism under higher electric fields.
{"title":"Enhanced dielectric, ferroelectric and leakage current properties of periodically layered (Bi, La)FeO3-PbTiO3/Bi(Fe, Mn)O3-PbTiO3 thin films on Hastelloy substrates","authors":"Yaning Shen, Zhengrong Xue, Xiaoxuan Ma, Tian He, Jinrong Cheng, Shixun Cao","doi":"10.1007/s10971-025-06698-5","DOIUrl":"10.1007/s10971-025-06698-5","url":null,"abstract":"<div><p>Taking both advantages of Mn or La doped 0.7BiFeO<sub>3</sub>-0.3PbTiO<sub>3</sub> (BF-PT) thin films, a periodic structured 0.7(Bi<sub>0.95</sub>La<sub>0.05</sub>)FeO<sub>3</sub>-0.3PbTiO<sub>3</sub>/0.7Bi(Fe<sub>0.95</sub>Mn<sub>0.05</sub>)O<sub>3</sub>-0.3PbTiO<sub>3</sub> (BLF-PT/BFM-PT) thin films were deposited on Hastelloy substrates alternatively to achieve excellent dielectric and ferroelectric properties with low leakage current density. La<sup>3+</sup>or Mn<sup>2+</sup> doped BF-PT thin films were deposited on the PbTiO<sub>3</sub> (PT) buffered Hastelloy substrates by using the sol-gel method. The comparisons were conducted among undoped BF-PT, BFM-PT, BLF-PT and periodic BLF-PT/BFM-PT thin films in view of the dielectric, ferroelectric and conduction properties. It has been found that La<sup>3+</sup>or Mn<sup>2+</sup> doped BF-PT thin films on Hastelloy maintain good dielectric, ferroelectric and leakage current properties. Particularly, periodic BLF-PT/BFM-PT thin films exhibit the higher dielectric constant (ε<sub>r</sub>) and lower dielectric loss (tanδ) of 266 and 0.058 respectively at frequency of 10<sup>3 </sup>Hz, and the lower leakage current density of 8.66 × 10<sup>−8 </sup>A/cm<sup>2</sup>. The conduction mechanism of BFM-PT and periodic BLF-PT/BFM-PT thin films was of ohmic conduction under fields of below 300 kV/cm, while it was of FN tunneling (Fowler Nordheim tunneling) conduction above 62 kV/cm for undoped BF-PT thin films. Moreover, the interfaces of periodic thin films further prevent the transport of carriers, revealing the bulk limitation conduction mechanism under higher electric fields.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"477 - 485"},"PeriodicalIF":2.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830905","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}
Pub Date : 2025-02-15DOI: 10.1007/s10971-025-06695-8
P. Mofazali, H. Farnoush
Biosilicate materials have garnered significant interest for their potential to enhance corrosion resistance, particularly in biomedical applications. In this study, the surface of AZ31 magnesium alloy was modified with Sr-doped bredigite/chitosan nanocomposite coatings to improve corrosion resistance for use in biodegradable implants. Bredigite calcium silicate (Ca7-xSrxMgSi4O16), synthesized via a combustion sol–gel method with varying strontium doping levels (x = 0, 0.05, 0.1, 0.2, 0.4), was combined with chitosan and applied to magnesium substrates through electrophoretic deposition. Various techniques were employed to analyze and compare the chemical composition, verifying the incorporation of strontium into the bredigite structure. Electrochemical analysis demonstrated that the Sr-doped Bredigite/chitosan coatings significantly enhanced the corrosion resistance of the magnesium alloy in simulated body fluid. Polarization tests revealed that coatings containing 0.2 strontium substantially reduce the corrosion current density from 17.12 μA/cm² to ~1.37 μA/cm2. These coatings, exhibiting remarkable bioactivity and corrosion protection, hold strong potential as candidates for biodegradable magnesium-based implants in biomedical applications.
{"title":"Fabrication and characterization of Sr-modified Bredigite/chitosan nanocomposite coatings on AZ31 alloy via electrophoretic deposition for bone applications","authors":"P. Mofazali, H. Farnoush","doi":"10.1007/s10971-025-06695-8","DOIUrl":"10.1007/s10971-025-06695-8","url":null,"abstract":"<div><p>Biosilicate materials have garnered significant interest for their potential to enhance corrosion resistance, particularly in biomedical applications. In this study, the surface of AZ31 magnesium alloy was modified with Sr-doped bredigite/chitosan nanocomposite coatings to improve corrosion resistance for use in biodegradable implants. Bredigite calcium silicate (Ca<sub>7-x</sub>Sr<sub>x</sub>MgSi<sub>4</sub>O<sub>16</sub>), synthesized via a combustion sol–gel method with varying strontium doping levels (<i>x</i> = 0, 0.05, 0.1, 0.2, 0.4), was combined with chitosan and applied to magnesium substrates through electrophoretic deposition. Various techniques were employed to analyze and compare the chemical composition, verifying the incorporation of strontium into the bredigite structure. Electrochemical analysis demonstrated that the Sr-doped Bredigite/chitosan coatings significantly enhanced the corrosion resistance of the magnesium alloy in simulated body fluid. Polarization tests revealed that coatings containing 0.2 strontium substantially reduce the corrosion current density from 17.12 μA/cm² to ~1.37 μA/cm<sup>2</sup>. These coatings, exhibiting remarkable bioactivity and corrosion protection, hold strong potential as candidates for biodegradable magnesium-based implants in biomedical applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"430 - 446"},"PeriodicalIF":2.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830900","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}
The ceramic membranes hold significant promise for dye wastewater treatment, owing to their exceptional water permeability, mechanical strength, and chemical stability. However, membrane fouling causes undesired filtration performance. In this study, the Ag/ZrO2-SiO2 composite ceramic membranes with varying molar ratios of Ag/Si (nAg) were fabricated by incorporating AgNO3 into the ZrO2-SiO2 matrix using the sol−gel method. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements revealed that the doped Ag element exists in the form of metallic Ag0 nanoparticles (AgNPs). The introduction of AgNPs was found to optimize the surface microstructure and control the charge properties of the membrane, thus enhancing the dye rejection performance of Ag/ZrO2-SiO2 membranes under various filtration conditions. The effect of nAg was studied to establish an optimal balance between antibacterial activity and dye rejection performance. The optimized Ag0.1/ZrO2-SiO2 (nAg = 0.1) materials displayed superior antibacterial activity evidenced by antibacterial efficiency of 98.86% against Escherichia coli and 97.42% against Staphylococcus aureus. Furthermore, the Ag0.1/ZrO2-SiO2 membrane exhibited a remarkable rejection of 96.74% and a flux of 331.36 L m−2 h−1 for 50 mg L−1 reactive black KN−B solution at 2 bar and 25 °C. Compared to the ZrO2-SiO2 membrane, the Ag0.1/ZrO2-SiO2 membrane indicated enhanced rejections of the five dyes with various molecular weights along with excellent anti-fouling performance of reactive black KN-B with a flux recovery of 91.18% after three anti-fouling filtration cycles. This study highlights the potential of the Ag/ZrO2-SiO2 membrane for effective dye wastewater treatment.
Graphical Abstract
{"title":"Enhanced antibacterial activity, dye rejection and anti-fouling performance of ZrO2-SiO2 composite ceramic membranes embedded by silver nanoparticles","authors":"Yutian Mei, Jing Yang, Ruifeng Zhang, Hongji Li, Yingming Guo","doi":"10.1007/s10971-025-06697-6","DOIUrl":"10.1007/s10971-025-06697-6","url":null,"abstract":"<div><p>The ceramic membranes hold significant promise for dye wastewater treatment, owing to their exceptional water permeability, mechanical strength, and chemical stability. However, membrane fouling causes undesired filtration performance. In this study, the Ag/ZrO<sub>2</sub>-SiO<sub>2</sub> composite ceramic membranes with varying molar ratios of Ag/Si (<i>n</i><sub><i>Ag</i></sub>) were fabricated by incorporating AgNO<sub>3</sub> into the ZrO<sub>2</sub>-SiO<sub>2</sub> matrix using the sol−gel method. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements revealed that the doped Ag element exists in the form of metallic Ag<sup>0</sup> nanoparticles (AgNPs). The introduction of AgNPs was found to optimize the surface microstructure and control the charge properties of the membrane, thus enhancing the dye rejection performance of Ag/ZrO<sub>2</sub>-SiO<sub>2</sub> membranes under various filtration conditions. The effect of <i>n</i><sub><i>Ag</i></sub> was studied to establish an optimal balance between antibacterial activity and dye rejection performance. The optimized Ag<sub>0.1</sub>/ZrO<sub>2</sub>-SiO<sub>2</sub> (<i>n</i><sub><i>Ag</i></sub> = 0.1) materials displayed superior antibacterial activity evidenced by antibacterial efficiency of 98.86% against <i>Escherichia coli</i> and 97.42% against <i>Staphylococcus aureus</i>. Furthermore, the Ag<sub>0.1</sub>/ZrO<sub>2</sub>-SiO<sub>2</sub> membrane exhibited a remarkable rejection of 96.74% and a flux of 331.36 L m<sup>−2</sup> h<sup>−1</sup> for 50 mg L<sup>−1</sup> reactive black KN−B solution at 2 bar and 25 °C. Compared to the ZrO<sub>2</sub>-SiO<sub>2</sub> membrane, the Ag<sub>0.1</sub>/ZrO<sub>2</sub>-SiO<sub>2</sub> membrane indicated enhanced rejections of the five dyes with various molecular weights along with excellent anti-fouling performance of reactive black KN-B with a flux recovery of 91.18% after three anti-fouling filtration cycles. This study highlights the potential of the Ag/ZrO<sub>2</sub>-SiO<sub>2</sub> membrane for effective dye wastewater treatment.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"413 - 429"},"PeriodicalIF":2.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830901","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}
Pub Date : 2025-02-12DOI: 10.1007/s10971-025-06688-7
Sumia Rubab, Sarah A. Alsalhi, Abhinav Kumar, Subhash Chandra, R. Roopashree, RSK Sharma, Piyush Kumar Pathak, Suman Saini, Vivek Kumar Pandey, Rajesh Haldhar
Perovskite oxides are considered as highly effective oxygen evolution reaction (OER) catalysts under alkaline environments, to promote the reaction kinetics, allowing for more flexible electron transmission. In this work, a nanoflakes-based Sm-doped AlFeO3 material was produced using a simple hydrothermal approach to evaluate its catalytic properties for OER. The electrocatalysts were evaluated using several analytical techniques to investigate their crystallinity, surface area and morphology. However, the physical analysis shows that the material has nanoflakes-like morphology which provides effective channels for the transmission of electrons which results in an improved surface area (61.58 m2 g−1) as validated via Brunnauer Emmett Teller (BET) measurements. To address the redox behavior, different electrochemical characterizations were performed to confirm the durability as well as the minimal overpotential exhibited by the material. Thus, the study shows that the Sm-doped AlFeO3 has the reduced Tafel gradient (32 mV dec−1) and utmost endurance of 40 h, with an overpotential (η) of 188 mV. Moreover, the impedance study supports this concept that prepared material Sm-doped AlFeO3 has better OER kinetics since it has a low Rct value (0.26 Ω) which indicates effective charge transmission. This work promotes the catalytic ability of perovskite oxides and shows their immediate applications in the development of improved OER electrocatalysts and other energy-related applications.
Graphical Abstract
{"title":"Study on electrocatalytic performance of Sm doped AlFeO3 as an electrocatalyst for OER","authors":"Sumia Rubab, Sarah A. Alsalhi, Abhinav Kumar, Subhash Chandra, R. Roopashree, RSK Sharma, Piyush Kumar Pathak, Suman Saini, Vivek Kumar Pandey, Rajesh Haldhar","doi":"10.1007/s10971-025-06688-7","DOIUrl":"10.1007/s10971-025-06688-7","url":null,"abstract":"<div><p>Perovskite oxides are considered as highly effective oxygen evolution reaction (OER) catalysts under alkaline environments, to promote the reaction kinetics, allowing for more flexible electron transmission. In this work, a nanoflakes-based Sm-doped AlFeO<sub>3</sub> material was produced using a simple hydrothermal approach to evaluate its catalytic properties for OER. The electrocatalysts were evaluated using several analytical techniques to investigate their crystallinity, surface area and morphology. However, the physical analysis shows that the material has nanoflakes-like morphology which provides effective channels for the transmission of electrons which results in an improved surface area (61.58 m<sup>2</sup> g<sup>−1</sup>) as validated via Brunnauer Emmett Teller (BET) measurements. To address the redox behavior, different electrochemical characterizations were performed to confirm the durability as well as the minimal overpotential exhibited by the material. Thus, the study shows that the Sm-doped AlFeO<sub>3</sub> has the reduced Tafel gradient (32 mV dec<sup>−1</sup>) and utmost endurance of 40 h, with an overpotential (η) of 188 mV. Moreover, the impedance study supports this concept that prepared material Sm-doped AlFeO<sub>3</sub> has better OER kinetics since it has a low R<sub>ct</sub> value (0.26 Ω) which indicates effective charge transmission. This work promotes the catalytic ability of perovskite oxides and shows their immediate applications in the development of improved OER electrocatalysts and other energy-related applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"114 2","pages":"399 - 412"},"PeriodicalIF":2.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830754","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}
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