Journal of Sol-Gel Science and Technology最新文献_第5页

A new way to tune photocatalytic activity, surface morphology, and structural/optical parameters of ZrO2 thin films using different Zr sources along with annealing temperature and film thickness 利用不同的锆源以及退火温度和薄膜厚度调节 ZrO2 薄膜的光催化活性、表面形貌和结构/光学参数的新方法

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-09 DOI: 10.1007/s10971-024-06534-2

Gulsen Sahin, Abdullah Goktas, Esra Aslan

Water recycling is a convenient way to get around the water shortage and wastewater analysis. The water can be reused for domestic purposes by eliminating organic pollutants through a photocatalytic process. For this aim, the sol-gel dip coating process synthesized ZrO2 nanostructured thin films with tunable structural, morphological, and optical properties and photocatalytic activities. Zr sources (acetate, nitrate, and chloride), annealing temperature (T_A), and thickness (d)-dependent structural, morphological, optical, and photocatalytic performances of the ZrO₂ films were scrutinized by x-ray diffraction (XRD), scanning electron microscopy (SEM), electron dispersive x-ray spectroscopy (EDS), mapping technique, and UV–Vis spectroscopy. The XRD, SEM, EDS, and mapping analyses confirmed the formation of nanostructured ZrO₂ thin film. The results revealed that ZrO₂ film had a tetragonal phase with various crystallite sizes and different surface morphologies as the Zr sources, T_A, and d varied. There were significant variations in the optical absorbance, band gap, refractive index, and absorption coefficient based on Zr sources, TA, and d. Among all ZrO₂ films, the film sample synthesized by the Zr-acetate source annealed at T_A of 500 °C and with d of 940 nm was found to be the most effective film in terms of optical and crystalline quality as well as photocatalytic performance (94% efficiency in 150 min) for the degradation of methylene blue dye. The enhanced light utilization capability suppressed charge recombination, surface morphology, grain size, defect concentration, and optical band gap values of the nanostructured zirconia thin films are the key factors corresponding to enhanced photocatalytic performance.

Graphical Abstract

水循环利用是解决水资源短缺和废水分析问题的便捷途径。通过光催化过程消除有机污染物，可将水回用于家庭用途。为此，采用溶胶-凝胶浸涂工艺合成了具有可调结构、形态、光学特性和光催化活性的 ZrO2 纳米结构薄膜。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、电子色散 X 射线光谱 (EDS)、制图技术和紫外可见光谱，研究了 ZrO2 薄膜的 Zr 来源（醋酸盐、硝酸盐和氯化物）、退火温度 (TA) 和厚度 (d) 与结构、形态、光学和光催化性能的关系。X射线衍射、扫描电子显微镜、电子色散 X 射线光谱和绘图分析证实了纳米结构 ZrO2 薄膜的形成。结果表明，随着 Zr 源、TA 和 d 的变化，ZrO2 薄膜具有不同结晶尺寸和不同表面形态的四方相。在所有 ZrO2 薄膜中，由醋酸锆源合成的薄膜样品在 TA 值为 500 ℃、d 值为 940 nm 时退火，其光学质量、结晶质量和光催化性能（150 分钟内效率为 94%）对亚甲基蓝染料的降解效果最好。纳米结构氧化锆薄膜的光利用能力增强、电荷重组抑制、表面形貌、晶粒尺寸、缺陷浓度和光带隙值是光催化性能增强的关键因素。

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引用次数: 0

Effect of Al on photoluminescence properties of Nd3+ in silicate glass prepared by in-situ sol-gel method 铝对原位溶胶-凝胶法制备的硅酸盐玻璃中 Nd3+ 的光致发光特性的影响

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-09 DOI: 10.1007/s10971-024-06539-x

K. M. S. Dawngliana, Lalruat Puia, A. L. Fanai, Ralte Lalrempuia, S. Rai

This article discusses our investigations into the structural and spectroscopic properties of Nd³⁺ co-doped alumino-silicate glass prepared by an in-situ sol-gel method. Structural characterization was carried out using X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The XRD analysis reveals that the material is still amorphous even after being heated to 900 °C. FTIR analysis was used to identify the functional groups of the produced sol-gel silicate glass. The optical absorption spectra from the ground state ⁴I_9/2 show seven peaks in the UV-VIS and NIR regions. The optical absorption spectrum of Nd³⁺ co-doped alumino-silicate glass-ceramic was used to determine the Judd-Ofelt (JO) intensity parameters (Ω₂, Ω₄ and Ω₆). The photoluminescence (PL) spectrum was recorded with a 2W diode laser source of 808 nm excitations. From the larger stimulated emission cross-section (3.80 x 10⁻²⁰ cm²) of the ⁴F_3/2 → ⁴I_11/2 transition, it is concluded that the SiNdAl glasses could be highly useful for the development of solid state laser materials. From the observed refractive indices at three different wavelengths, non-linear parameters for the glass, such as the Abbe number (υ_Ab) and non-linear refractive index (n₂), are derived.

Graphical Abstract

本文讨论了我们对采用原位溶胶-凝胶法制备的掺杂 Nd3+ 的铝硅酸盐玻璃的结构和光谱特性的研究。我们使用 X 射线粉末衍射 (XRD)、傅立叶变换红外光谱 (FTIR) 和扫描电子显微镜 (SEM) 技术进行了结构表征。X 射线衍射分析表明，即使加热到 900 ℃，材料仍然是无定形的。傅立叶变换红外光谱分析用于确定所生产的溶胶凝胶硅酸盐玻璃的官能团。基态 4I9/2 的光学吸收光谱在紫外-可见光区和近红外区显示出七个峰值。利用共掺杂 Nd3+ 的铝硅酸盐玻璃陶瓷的光学吸收光谱确定了 Judd-Ofelt (JO) 强度参数（Ω2、Ω4 和 Ω6）。光致发光（PL）光谱是用 808 纳米激发的 2 瓦二极管激光源记录的。从 4F3/2 → 4I11/2 转变的较大受激发射截面（3.80 x 10-20 cm2）可以得出结论，SiNdAl 玻璃可用于开发固态激光材料。根据在三种不同波长下观察到的折射率，得出了玻璃的非线性参数，如阿贝数 (υAb) 和非线性折射率 (n2)。

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引用次数: 0

Crystallization mechanism of barium titanate in amorphous titania gel pellets by acid–base chemical densification near room temperature 无定形二氧化钛凝胶颗粒中的钛酸钡在室温附近通过酸碱化学致密化作用的结晶机理

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-08 DOI: 10.1007/s10971-024-06535-1

Rei Nakayama, Yuki Yamaguchi, Hirofumi Sumi

To achieve carbon neutrality by 2050, novel ceramic processes which can fabricate it at lower temperatures compared with conventional sintering process are required. Bulk barium titanate (BaTiO₃) is directly synthesized from hydrous titania gel (TiO₂·nH₂O) pellets near room temperature via the acid–base chemical densification (ABCD) process, which affords perovskite oxides via neutralization reactions. TiO₂·nH₂O used as precursor material has amorphous structure and includes a trace amount of water in its structure. Scanning electron microscopy images show that the mechanism of BaTiO₃ crystallization in TiO₂·nH₂O pellet is dependent on the reaction conditions in the barium hydroxide solution, including the heat-treating temperature and time. The bulk BaTiO₃ are obtained from TiO₂·nH₂O pellets by treating below 100 °C for a long time more than 25 h; however, heat-treating at higher temperatures caused TiO₂·nH₂O pellets to disintegrate. It is consolidated that dominant reaction, whether the diffusion reaction or a dissolution–precipitation reaction, in this process depends on the reaction temperature and time. Then, at higher temperatures than 120 °C, a part of TiO₂·nH₂O pellets dissolve to barium hydroxide solution as a dissolution–precipitation reaction. In contrast, at below 120 °C, BaTiO₃ bulk is obtained by diffusion reaction of Ba ion into TiO₂·nH₂O pellet.

Graphical Abstract

为了在 2050 年前实现碳中和，需要采用新型陶瓷工艺，与传统烧结工艺相比，这种工艺可以在更低的温度下制造碳中和。块状钛酸钡（BaTiO3）是通过酸碱化学致密化（ABCD）工艺，在接近室温时从无水二氧化钛凝胶（TiO2-nH2O）颗粒中直接合成的，该工艺通过中和反应生成包晶氧化物。用作前驱体材料的 TiO2-nH2O 具有无定形结构，其结构中含有微量的水。扫描电子显微镜图像显示，TiO2-nH2O 粒子中 BaTiO3 的结晶机制取决于氢氧化钡溶液中的反应条件，包括热处理温度和时间。TiO2-nH2O 粒子在 100 °C 以下经过 25 小时以上的长时间处理，可获得块状 BaTiO3；但在较高温度下进行热处理会导致 TiO2-nH2O 粒子解体。这说明在这一过程中，无论是扩散反应还是溶解沉淀反应，其主导反应都取决于反应温度和时间。然后，在高于 120 °C 的温度下，部分 TiO2-nH2O 颗粒溶解到氢氧化钡溶液中，这是一种溶解沉淀反应。相反，在低于 120 ℃ 的温度下，钡离子通过扩散反应进入 TiO2-nH2O 粒子，从而获得块状 BaTiO3。

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引用次数: 0

Highly stable wavelength converting composite based on sol–gel derived siloxane-encapsulated luminescent nanocrystals 基于溶胶-凝胶衍生硅氧烷封装发光纳米晶体的高稳定波长转换复合材料

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-08 DOI: 10.1007/s10971-024-06536-0

Yongmin Shin, Somin Park, Byung Jo Um, Seungwan Kim, Junho Jang, Byeong-Soo Bae

Luminescent nanocrystals (NCs) have emerged as the high-performance wavelength converting materials in next-generation displays and energy conversion devices due to their unique optophysical properties, such as large Stokes or anti-Stokes shifts, narrow emission bandwidth, and tunable bandgap depending on size or composition. However, poor long-term stability in high temperature and humidity remains a critical issue for device applications. This instability is primarily due to irreversible changes in surface ligands or chemical structures/compositions when exposed to various severe environments. Various strategies have been reported to address these issues, such as the formation of inorganic shell layers and the fabrication of polymer-based nanocomposites. Although these strategies have improved stability, they exhibit degraded properties during long-term aging. Recently, sol–gel derived siloxane hybrid materials have been introduced to achieve stability for various NCs under actual operating conditions of displays and optoelectronic devices. This review will address recent progress in developing siloxane-encapsulated NCs with high stability in high temperature/humidity and under continuous light exposure. It will also introduce results on enhancing the environmental stability of various NCs, including lanthanide-doped transition metal-based NCs, semiconducting NCs, and metal halide perovskite NCs, as well as demonstrations of reliable devices.

Graphical Abstract

发光纳米晶体（NC）具有独特的光物理特性，如大斯托克斯或反斯托克斯偏移、窄发射带宽以及根据尺寸或组成可调的带隙，因此已成为下一代显示器和能量转换设备中的高性能波长转换材料。然而，高温高湿环境下的长期稳定性较差仍然是器件应用的一个关键问题。这种不稳定性主要是由于暴露在各种恶劣环境中时，表面配体或化学结构/组成发生了不可逆的变化。为解决这些问题，已报道了各种策略，如形成无机外壳层和制造聚合物基纳米复合材料。虽然这些策略提高了稳定性，但在长期老化过程中会出现性能退化。最近，人们引入了溶胶-凝胶衍生硅氧烷杂化材料，以实现各种数控器件在显示器和光电设备实际工作条件下的稳定性。本综述将介绍在开发高温/高湿和持续光照条件下具有高稳定性的硅氧烷封装 NC 方面的最新进展。它还将介绍提高各种数控器件（包括掺杂镧系过渡金属的数控器件、半导体数控器件和金属卤化物包光体数控器件）环境稳定性的成果，以及可靠器件的演示。

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引用次数: 0

Template free synthesis of CuO nanoflakes and walnut shape CuO/CeO2 heterostructures: characterization and their role as an antibacterial materials and biofilm inhibitors 无模板合成 CuO 纳米片和核桃形 CuO/CeO2 异质结构：表征及其作为抗菌材料和生物膜抑制剂的作用

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-08 DOI: 10.1007/s10971-024-06533-3

Kanwal Javed, Yufang Ren, Sobia Kousar, Yifan Liu, Zhenhao Cao, Bushra Begum, Xue Li

To prevent the worldwide diseases caused by the micro-organisms, the great effort has been performed to synthesize unique CuO nanoflakes (NF) and walnut shape (W-S) CuO/CeO₂ heterostructures with O vacancies by a simple precipitation technique without using any template. The morphology, structure, valance states, chemical composition and surface charge of the synthesized samples were inspected by i.e. scanning electron microscope (SEM), energy dispersive X-Ray (EDX), resolution transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and zeta potential (ζ). The expected crystallite’s size was studied by XRD data i.e. for CuO NF ~5.9 nm with 0.1–0.2% error and SD is ±0.2–0.5, while for the W-S CuO/CeO₂ heterostructures it is about ~6.4 nm with 0.05–0.1% error and SD is ±0.1–0.2 respectively. Both samples were tested as an antiseptic agent against E. coli and S. aureus, and it was confirmed that they had greater antibacterial effects as compared to the control group (water) which showed no response (0%). It was predicted that the CuO/CeO₂ heterostructure showed excellent antibacterial activity (100%) verses pure CuO NF (80–90%) at the same 0.2 mg/L concentration for E. coli with SD (±0–1). While against S. Aureus strain the CuO/CeO₂ heterostructure showed (80–90%) antibacterial action at the lowest concentration (0.2 mg/L) but 100% as the concentration increases i.e. 0.5 mg/L due to difference in bacterial strain with the SD (±0–2). After remarkable antibacterial activity, the biofilm inhibition of CuO/CeO₂ heterostructure against S. aureus was also studied by crystal violet staining, and examined that the inhibition effect of the biofilm increases with the increase concentration of heterostructures. At 0.31 mg/mL, the biofilm reduced visibly and the whole structure has destroyed, indicating that it is a remarkable biofilm inhibitor.

Graphical Abstract

为了预防由微生物引起的世界性疾病，人们不使用任何模板，通过简单的沉淀技术合成了独特的氧化铜纳米片（NF）和核桃形（W-S）CuO/CeO2 异质结构，其中含有 O 空位。通过扫描电子显微镜（SEM）、能量色散 X 射线（EDX）、分辨透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、傅立叶变换红外光谱（FT-IR）、X 射线衍射仪（XRD）、X 射线光电子能谱（XPS）和 ZETA 电位（ζ）对合成样品的形貌、结构、价态、化学成分和表面电荷进行了检测。通过 XRD 数据研究了预期的晶粒大小，即 CuO NF ~5.9 nm，误差为 0.1-0.2%，SD 为 ±0.2-0.5；而 W-S CuO/CeO2 异质结构的晶粒大小约为 ~6.4 nm，误差为 0.05-0.1%，SD 为 ±0.1-0.2。对这两种样品进行了针对大肠杆菌和金黄色葡萄球菌的抗菌测试，结果表明，与无反应（0%）的对照组（水）相比，这两种样品具有更强的抗菌效果。据预测，在相同的 0.2 毫克/升浓度下，CuO/CeO2 异质结构对大肠杆菌的抗菌活性（100%）优于纯 CuO NF（80%-90%），SD 为（±0-1）。而对于金黄色葡萄球菌菌株，CuO/CeO2 异质结构在最低浓度（0.2 毫克/升）下显示出（80-90%）的抗菌作用，但随着浓度的增加，即 0.5 毫克/升，由于细菌菌株的差异（SD 为 ±0-2），CuO/CeO2 异质结构显示出 100%的抗菌作用。CuO/CeO2 异质结构具有明显的抗菌活性后，还通过水晶紫染色法研究了其对金黄色葡萄球菌生物膜的抑制作用。在 0.31 mg/mL 的浓度下，生物膜明显减少，整个结构被破坏，这表明它是一种显著的生物膜抑制剂。

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引用次数: 0

Sustainable synthesis of MFI zeolite and derived metal-acid bifunctional catalysts for hydroisomerization of n-heptane 可持续合成用于正庚烷加氢异构化的 MFI 沸石和衍生金属酸双功能催化剂

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-07 DOI: 10.1007/s10971-024-06542-2

Mengxuan Zhu, Wenqi Xu, Longyang Wang, Rui Wang, Heng Jiang, Changzi Jin

Developing sustainable synthesis method of versatile zeolites to overcome the shortcoming of traditional process is of significant for development of green chemistry and environmentally friendly techniques. In this work, MFI zeolite (ZSM-5) was synthesized through organotemplate-, solvent- and seed-free sustainable process comprising physical grinding and quasi-solid state crystallization and utilizing commercial silica gel or Stöber colloidal SiO₂ as silica source. The key influencing factors to this sustainable synthesis process, such as starting material composition, crystallization temperature and time, had been unambiguously investigated by combining a series of characterization techniques. It is revealed that the starting material with SiO₂/Al₂O₃ and Na₂O/SiO₂ at 30–40 and 0.072, respectively, is suitable to obtain zeolite product with high crystallinity. The presence of right amount of water (or alcohol) is also crucial. In addition, this green synthesis method can be extended into the fabrication of encapsulated metal-zeolite bifunctional catalyst, which is effective in hydroisomerization of n-heptane. These results are instructive for development of sustainable synthesis of aluminosilicate zeolites and derived heterogeneous catalysts.

Graphical Abstract

开发多功能沸石的可持续合成方法，克服传统工艺的不足，对于发展绿色化学和环境友好技术具有重要意义。在这项工作中，利用商用硅胶或斯托伯胶体二氧化硅作为硅源，通过物理研磨和准固态结晶等有机模板、无溶剂和无种子的可持续工艺合成了 MFI 沸石（ZSM-5）。通过结合一系列表征技术，明确研究了这种可持续合成工艺的关键影响因素，如起始材料成分、结晶温度和时间。结果表明，SiO2/Al2O3 和 Na2O/SiO2 分别为 30-40 和 0.072 的起始材料适合获得高结晶度的沸石产品。适量的水（或酒精）的存在也很关键。此外，这种绿色合成方法还可扩展到封装金属-沸石双功能催化剂的制备，该催化剂对正庚烷的加氢异构化非常有效。这些结果对开发铝硅酸盐沸石和衍生异相催化剂的可持续合成具有指导意义。

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引用次数: 0

Structural, nano texture, and optical study of Vanadium-doped zinc oxide thin films for blue LEDs 用于蓝光 LED 的掺钒氧化锌薄膜的结构、纳米纹理和光学研究

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-06 DOI: 10.1007/s10971-024-06517-3

Apoorva Katoch, Navneet Kaur, Davinder Kumar, Balraj Singh, Vandana Shinde, Raminder Kaur

The judicious use of transition metals, notably vanadium (V), is critical to improving zinc oxide (ZnO) photoelectric performance. This research reveals the transforming effect of different V doping levels on zinc oxide (V:ZnO) thin films precisely manufactured using a sol-gel dip-coating process. X-ray diffraction (XRD) reveals the evolving characteristics of the films, revealing a shift towards increased structural coherence and preferred orientation as V doping concentrations increase. Scanning electron microscopy (SEM) and its nano texture fractal studies reveal a gradual refinement in the texture and arrangement of V:ZnO films with increased doping levels. The effective V doping inside the ZnO thin films is confirmed by energy dispersive spectroscopy (EDS). Furthermore, the ultraviolet-visible (UV-Vis) absorption coefficient increases when the Urbach energy (E_U) increases and the energy gap (E_g) decreases. Notably, V:ZnO displays exceptional emissions in the intrinsic excitation region at 300 nmand within the defect emission range of 380–650 nm at 3% dopingmaking it a promising candidate for blue LED applications. However, care is advised since extensive doping may impair the photoluminescence properties of ZnO. Urbach tails in weak absorption region decreased with increasing % of V in ZnO. Urbach energies (E_u) were in the 0.32–0.52 meV range for as-deposited and annealed films. This was used to account for the disorder of the films—an inverse relation was observed between Urbach energy and optical band energy as a result of doping. Research findings presented in this work give significant information on the complexities of V doping in ZnO, paving the way for advanced optoelectronic applications, particularly in blue LEDs.

Graphical Abstract

合理使用过渡金属，特别是钒（V），对于提高氧化锌（ZnO）的光电性能至关重要。这项研究揭示了不同钒掺杂水平对采用溶胶-凝胶浸涂工艺精确制造的氧化锌（V:ZnO）薄膜的转化效应。X 射线衍射 (XRD) 揭示了薄膜不断变化的特性，显示出随着 V 掺杂浓度的增加，薄膜的结构一致性和优先取向性也在增加。扫描电子显微镜（SEM）及其纳米纹理分形研究显示，随着掺杂水平的提高，氧化锌薄膜的纹理和排列逐渐细化。能量色散光谱（EDS）证实了氧化锌薄膜中有效的钒掺杂。此外，当乌尔巴赫能（EU）增加、能隙（Eg）减小时，紫外可见（UV-Vis）吸收系数也会增加。值得注意的是，在掺杂 3% 时，V:ZnO 在 300 纳米的本征激发区域和 380-650 纳米的缺陷发射范围内显示出卓越的发射性能，使其成为蓝光 LED 应用的理想候选材料。然而，由于大量掺杂可能会损害氧化锌的光致发光特性，因此应谨慎使用。随着氧化锌中 V 含量的增加，弱吸收区的 Urbach 尾随也随之减少。淀积和退火薄膜的厄巴赫能量（Eu）在 0.32-0.52 meV 范围内。这可以用来解释薄膜的无序性--由于掺杂，观察到厄巴赫能和光带能之间存在反比关系。这项研究成果提供了有关氧化锌中掺杂 V 的复杂性的重要信息，为先进的光电应用，尤其是蓝光 LED 的应用铺平了道路。

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引用次数: 0

Fabrication of high performance SnFe2O4@PANI electrocatalyst for Oxygen Evaluation Reaction (OER) by hydrothermal method 水热法制备用于氧评价反应 (OER) 的高性能 SnFe2O4@PANI 电催化剂

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-09-02 DOI: 10.1007/s10971-024-06495-6

Mukhtiar Hussain, Abdelaziz Gassoumi, Ilya A. Weinstein, A. Kahshan, Khursheed Ahmad, A. M. A. Henaish

Developing cutting-edge catalysts for oxygen evolution reaction (OER) is crucial for enhancing the efficiency of water splitting. Spinel-type materials have gained recognition for their exceptional catalytic performance in OER activity. The excessive OER overpotential is the significant obstacle that hinders the use of spinel-type materials. In this work, polyaniline (PANI) was incorporated to significantly enhance the performance of spinel SnFe₂O₄ material by straightforward hydrothermal method. SnFe₂O₄@PANI catalyst demonstrated an impressive overpotential of 198 mV at 10 mA cm^–2 and a 33 mV dec^–1 Tafel slope with higher OER activity. The electrochemical surface area (ECSA) of SnFe₂O₄@PANI catalyst was determined to be 2348.53 cm², with higher cyclic stability of 25 h after 5000th cycles with minimal impedance characteristics (R_ct = 0.18 Ω). In addition, the findings showed that the inclusion of PANI led to expansion of the surface area to improve the conductivity, resulting in notable enhancement of the catalysts’ OER activity. This modification has resulted in an improved OER catalyst, making it highly sought after for various applications in the water-splitting field.

Graphical Abstract

开发用于氧进化反应（OER）的尖端催化剂对于提高水分离效率至关重要。尖晶石型材料因其在氧进化反应活性方面的优异催化性能而获得认可。过高的 OER 过电位是阻碍尖晶石型材料应用的主要障碍。在这项工作中，通过直接水热法加入聚苯胺（PANI），显著提高了尖晶石 SnFe2O4 材料的性能。SnFe2O4@PANI 催化剂在 10 mA cm-2 时的过电位为 198 mV，Tafel 斜率为 33 mV dec-1，具有更高的 OER 活性。经测定，SnFe2O4@PANI 催化剂的电化学表面积（ECSA）为 2348.53 平方厘米，具有更高的循环稳定性，在循环 5000 次后仍能保持 25 小时，阻抗特性极小（Rct = 0.18 Ω）。此外，研究结果表明，PANI 的加入扩大了表面积，从而提高了导电性，显著增强了催化剂的 OER 活性。这种改性催化剂改善了 OER 的性能，使其在水分离领域的各种应用中备受青睐。

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引用次数: 0

The structural, mechanical, and biological variation of silica bioglasses obtained by different sintering temperatures 不同烧结温度下获得的二氧化硅生物玻璃的结构、力学和生物学变化

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-08-30 DOI: 10.1007/s10971-024-06480-z

M. Sarmast Sh, A. B. Dayang Radiah, D. A. Hoey, N. Abdullah, H. S. Zainuddin, S. Kamarudin

The challenges of forming a crystalline phase within 45S5 Bioglass^® (45% SiO₂-24.5% CaO-24.5% Na₂O-6% P₂O₅ mol%) and its subsequent influence on the bioactivity of the bioglass were studied in this research. Bioglasses were sintered at 1400, 750, and 550 °C, using both melting and sol-gel methods. The different responses of bioglasses to different sintering temperatures were revealed. Particularly, increased crystallinity was observed in sol-gel-derived bioglass sintered at 750 °C, indicating a denser and more ordered structure. This crystalline architecture facilitated enhanced bioactivity, as demonstrated by increased hydroxyapatite deposition when immersed in simulated body fluid (SBF). Furthermore, superior mechanical properties and biocompatibility were achieved with this temperature regime, making it a prime candidate for bone regeneration applications. The bioglass sintered at 750 °C exhibited an accelerated degradation rate associated with its porosity, potentially contributing to faster material resorption in vivo. Its antibacterial efficacy against E. coli and S. aureus was also noted, and in vitro studies with MTT assay confirmed that the optimized sol-gel bioglass meets biocompatibility standards. These findings highlight the potential of fine-tuning the sintering temperature to modulate the crystallinity of bioglasses, thereby enhancing their application scope in bone tissue engineering.

Graphical Abstract

本研究探讨了在 45S5 Bioglass®（45% SiO2-24.5% CaO-24.5% Na2O-6% P2O5 mol%）中形成结晶相所面临的挑战及其对生物玻璃生物活性的影响。生物玻璃在 1400、750 和 550 °C 温度下采用熔融和溶胶-凝胶两种方法烧结。结果显示了生物玻璃对不同烧结温度的不同反应。特别是在 750 ℃ 下烧结的溶胶-凝胶衍生生物玻璃中观察到结晶度增加，表明其结构更致密、更有序。这种结晶结构有助于增强生物活性，浸入模拟体液（SBF）后羟基磷灰石沉积增加就证明了这一点。此外，这种温度下的生物玻璃还具有优异的机械性能和生物相容性，因此成为骨再生应用的首选材料。在 750 °C 下烧结的生物玻璃显示出与多孔性相关的加速降解率，这可能会加快材料在体内的吸收。此外，它还具有抗大肠杆菌和金黄色葡萄球菌的功效，而 MTT 分析法的体外研究证实，经过优化的溶胶-凝胶生物玻璃符合生物相容性标准。这些发现凸显了微调烧结温度以调节生物玻璃结晶度的潜力，从而扩大了它们在骨组织工程中的应用范围。

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引用次数: 0

Towards sustainable pest management of broad scope: sol-gel microencapsulation of Origanum vulgare essential oil 实现范围广泛的可持续害虫管理：牛至草精油的溶胶-凝胶微胶囊技术

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-08-30 DOI: 10.1007/s10971-024-06512-8

Giuseppe Angellotti, Cristina Riccucci, Gabriella Di Carlo, Mario Pagliaro, Rosaria Ciriminna

Showing broad scope pesticidal properties, the Origanum vulgare essential oil is highly volatile, limiting effective agricultural applications. Aiming to develop new environmentally friendly and effective biopesticide based on O. vulgare essential oil we carried out its template-assisted sol-gel microencapsulation within silica microcapsules. The method affords mesoporous SiO₂ spherical particles about 430 nm in size with uniform size distribution (polydispersion index of 0.184) having encapsulation efficiency up to 13.7 wt%, and large positive zeta potential of 22.8 mV. Dubbed herein “SiliOregan”, this new class of sol-gel materials is promising towards the development of solid biopesticides formulated in water for pest management against fungi, insects, bacteria, nematodes, and mites.

Graphical Abstract

牛至精油具有广泛的杀虫特性，但挥发性强，限制了其在农业上的有效应用。为了开发基于牛至精油的新型环境友好型有效生物农药，我们在二氧化硅微胶囊中进行了模板辅助溶胶-凝胶微胶囊化。该方法得到的介孔二氧化硅球形颗粒大小约为 430 nm，粒度分布均匀（多分散指数为 0.184），封装效率高达 13.7 wt%，Zeta 电位高达 22.8 mV。这种新型的溶胶-凝胶材料被称为 "SiliOregan"，有望开发出在水中配制的固体生物农药，用于防治真菌、昆虫、细菌、线虫和螨虫等害虫。

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引用次数: 0