JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Zhang Wenlong,Wang Bin,Xu Yuxin,Chen Xiao,Zhang Kuibao,Hao Yan
To enhance the thermal stability of SiO 2 aerogels at high temperature, this study proposes a method involving the incorporation of MgAl 2 O 4 nanoparticles into SiO 2 aerogels to improve their high-temperature stability. By comparing the performance of MgAl 2 O 4 -SiO 2 aerogel with pure SiO 2 aerogels after heat treatment at high temperatures, it is demonstrated that the MgAl 2 O 4 nanoparticles significantly enhances the thermal stability of SiO 2 aerogels at elevated temperatures while almost no effect on thermal conductivity, about 0.0312 and 0.0322 W/(m·K). The MgAl 2 O 4 -SiO 2 aerogels exhibit superior thermal stability and insulation performance compared to pure SiO 2 aerogels at temperatures exceeding 800 ℃. Notably, even after heat treatment at 1100℃, a condition that causes pure SiO 2 aerogels to nearly lose their porous structure, the MgAl 2 O 4 -SiO 2 aerogels retain a specific surface area of 81.95 m 2 /g and thermal conductivity of 0.0584 W/(m·K).
研究领域:
材料科学
·
无机化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
·
2024
·
IF 2.7
Chen-Xiang Wang,Ning Wang,Xu-Sheng Li,Xue-Fen Zhang
In this research, the wetting behavior of SiO 2 modified with dodecyltrimethoxysilane (DTMS) was explored using both experimental and molecular dynamics (MD) simulation approaches. The experimental results reveal that DTMS can chemically bond to the SiO 2 surface, and the contact angle (CA) reaches the maximum value of 157.7° when the mass of DTMS is twice that of SiO 2 . The different wetting behaviors caused by DTMS grafting were analyzed by CA fitting, ionic pairs, concentration distribution, molecule orientation, and interfacial interaction energy. The results demonstrate that a 25 % DTMS grafting rate resulted in a maximum CA of 158.2°, which is ascribed to the disruption of interfacial hydrogen bonding and changes in the hydration structure caused by DTMS grafting. Moreover, the above hydrophobic SiO 2 model shows a slight decrease in CA as the water temperature increases, which is consistent with the experimental findings. In contrast, an opposite change was observed for the pristine SiO 2 model. Although the higher water temperature enhances the diffusion capacity of water molecules in both models, the difference in interfacial interactions is responsible for the change in CA. We hope this finding will contribute to a deeper understanding of the wetting adjustment of SiO 2 .
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhangyi Huang,Yi Zuo,Jiaochun Zheng,Mao Deng,Ruichong Chen,Haomin Wang
Hydroxyapatite (HA) ceramics have promising applications in various fields, such as medical and waste treatment. However, traditional high-temperature sintering methods suffer from issues like element volatilization and performance degradation. Additionally, HA ceramics prepared using the cold sintering process (CSP), a low-temperature processing technique, often exhibit low density and poor mechanical properties. In this work, HA ceramics were reinforced with 35 mol% SiO 2 . The SiO 2 -HA glass-ceramic, fabricated at 250 °C under 750 MPa pressure with 35 wt% deionized water via CSP, exhibits a high relative density of 92.4 %, a relatively high Vickers hardness of 5.4 GPa, a fracture toughness of 0.62 MPa m 1/2 , and a high compressive strength of 602 MPa. The hardness value of the glass-ceramic is significantly higher than those of HA ceramics prepared by CSP and is comparable to those of well-sintered HA ceramics via conventional high-temperature sintering. Additionally, we summarize the CSP densification mechanism of SiO 2 -HA glass-ceramics, which includes the dissolution-reprecipitation and plastic deformation of SiO 2 and HA, as well as the fracture and rearrangement of HA nanorods.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 16
·13810-13816
·
IF 2.986
Qingong Zhu,Huanping Wang,Ying Tian,Ren Gao,Shilong Zhao,Lihui Huang,Shiqing Xu,Xianghua Zhang
Glass system with compositions of 93.9% ( x CaO- y Al 2 O 3 - z SiO 2 )−5% MgO-1% B 2 O 3 −0.1% Fe 2 O 3 has been prepared by a conventional melt-quenching technique, and the glass forming region and the mechanical properties of the derived glasses were investigated. The approximate glass forming region was found to be x = 10～35%, y = 10～35% and z = 50～80%, while the rest of the area was crystallization zone or crack zone. As x = 10%, y = 25% and z = 65% (Sample 13), the investigated glass possesses the optimum volume density, bending strength , compression strength and modulus, which are 2.572 g/cm 3 , 74.05 MPa, 312.84 MPa and 163.96 GPa, respectively. Compared to sample 13, samples with different compositions have reduced the volume density, lowered the Raman intensity and improved the optical band gap. For the mechanical properties, with decreasing the contents of SiO 2 , the bending strength firstly increases, then decreases and finally shows a relatively small increasing trend. The dependence of compression strength and compression modulus on SiO 2 content shows a similar trend to the bending strength. Moreover, the optical band gap and Raman spectrum of the sample 13 indicate that the number of oxygen bonds in the bridge reach the maximum, which could further confirm a significantly improvement on the mechanical properties.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 12
·16870-16875
·
IF 4.527
Yanlin Li,Wenyuan Duan,Jian Wei
Among various carbon materials, diamond stands out due to excellent physical and chemical properties. In this work, we designed Dia@SiO 2 @Ag composites combining diamond micropowder and Ag nanoparticles by a simple chemical method and obtained stable substrate for surface enhanced Raman scattering (SERS) owing to its high surface-to-volume ratio, low density, as well as close bond between diamond and Ag. As-prepared Dia@SiO 2 @Ag presented high activity to detect crystal violet and rhodamine 6G molecules, which was demonstrated by significantly enhanced SERS spectra and high enhancement factor values (10 8 -10 9 ). Moreover, Dia@SiO 2 @Ag also showed desired sensitivity, which was investigated by detection limit. Therefore, our study provided more theoretical support and broadened the functional applications of diamond, particularly in Raman detection.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
拉曼光谱
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Xiao Lin Wu,Jie Lin,Jian Yan Wang,Hang Guo
In this paper composite nanofiber membranes were prepared by electrospinning technology from poly (vinylidene fluoride) (PVDF)-poly (methyl methacrylate) (PMMA)-SiO2 blend solutions with different PMMA and SiO2 contents. It was found that the diameter of electrospun nanofibers was greatly increased with the added PMMA content but decreased with the added SiO2 content, and when both PMMA and SiO2 were added the diameter of electrospun nanofibers was decreased. With a proper ratio of the PMMA and SiO2 added, the electrospum nanofiber membrane could have a suitable diameter with high porosity. The XRD results revealed that electrospun nanofiber membranes contained mainly β-phase crystal structure of PVDF, and its crystalline is reduced with the added PMMA and SiO2 contents due to the inhibited crystallization of the polymer by the inorganic particles and PMMA during the solidification process. These nanofiber membranes exhibited a high electrolyte uptake, around 300%. Moreover, the incorporation of PMMA and SiO2 into the nanofiber membrane improved the ionic conductivity from 1.7×10−3S/cm to 2.0×10−3S/cm at room temperature. Compared with commercial film PE, their cell cycle and charge and discharge performance were also greatly improved.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
Frontiers of Materials Science
·
2025
·Vol. 19
·期 4
·250746
·
IF 2.3
Jiang Wenyue,Yang Xue,Rahman M. D. Mahbubur,Weng Tong
Silica (SiO 2 ) aerogels have excellent physical and thermal properties with high-performance and broad application prospects. In order to obtain SiO 2 aerogels with high thermal insulation performance and explore key process parameters of their preparation, SiO 2 aerogels were prepared via combining sol–gel and freeze-drying processes using tetraethyl orthosilicate (TEOS) as the precursor. Effects of the pH value and the content of deionized water (DIW) on the microstructures and thermal properties of the SiO 2 aerogel were systematically investigated. Results showed that when the pH was 8.0 and the molar ratio of TEOS to DIW was 1:7, the SiO 2 aerogel had the best structure and the lowest thermal conductivity, exhibiting the best thermal insulation effect. In addition, the synthesis mechanism of such sol–gel freeze-dried SiO 2 aerogels was analyzed in depth, and the structural evolution process was also described. This study lays a theoretical foundation for the controllable preparation and process design of SiO 2 aerogels in the future, and has certain guiding significance for promoting their application in the field of efficient thermal insulation.
研究领域:
材料科学
·
热工工程
·
纳米材料
·
化学合成
✓ 已验证
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 11
·2401
·
IF 3.7
Jian Li,Shuhang Shi,Haitao Shu,Qianyu Chen,Yun Zhou,Ying Yuan,Xiaotian Peng
Highlights A transparent, flexible SiO 2 aerogel was prepared via ambient pressure drying using an optimized MTMS–DMDMS composite silicon source. The aerogel achieves a visible light transmittance of 89.74% and a low thermal conductivity of 0.027 W/(m·K). The introduction of DMDMS enhances flexibility, increasing compressive strength by 22.4% compared to pure MTMS aerogels. The material exhibits excellent hydrophobicity with a water contact angle of 125.98° and a low density of 0.1802 g/cm 3 . A multi-parameter cooperative regulation strategy enables balanced optimization of optical, thermal, and mechanical properties. The main findings. Using tetramethylammonium hydroxide (TMAOH) as the alkaline catalyst, a water/MTMS molar ratio of 7:1, and Pluronic F-127 (F127) as the surfactant yields a single-silicon-source SiO 2 aerogel with uniform pore structure, 93.50% porosity, 125.98° water contact angle, and 89.74% transmittance at 800 nm. Constructing an MTMS–DMDMS composite silicon source with a molar ratio of 9:1, 6 mL water addition, and 2.0 g F127 produces a flexible aerogel with 22.4% higher compressive strength, 70.15% visible transmittance, and thermal conductivity as low as 0.027 W/(m·K), achieving balanced mechanical, optical, and thermal insulation properties. The implications of the main findings. The optimized single-silicon-source preparation route enables stable, low-cost ambient pressure synthesis of transparent, hydrophobic SiO 2 aerogels, supporting scalable manufacturing for building energy-saving applications. The MTMS–DMDMS composite system resolves the trade-off between transparency, thermal insulation, and mechanical flexibility, providing a design paradigm for high-performance transparent thermal insulation materials used in glazing, smart facades, and optical insulation components. SiO 2 aerogels are promising candidates for energy-efficient glazing because of their low thermal conductivity and optical transparency; however, conventional formulations often fail to reconcile optical, thermal, and mechanical performance. This work aimed to resolve this bottleneck via controllable sol–gel synthesis and ambient pressure drying. Using methyltrimethoxysilane (MTMS) as the single silicon source, this study systematically explored the effects of alkaline catalyst type, water-to-MTMS ratio, and surfactant selection, and further developed an MTMS–dimethyl dimethoxy silicane (DMDMS) composite silicon source. Tetramethylammonium hydroxide (TMAOH) catalysis, a water-to-MTMS molar ratio of 7:1, and Pluronic F-127 (F127) surfactant yielded a uniform, hydrophobic aerogel with 93.50% porosity and 89.74% transmittance at 800 nm. The optimized composite system (MTMS:DMDMS = 9:1, 6 mL water, 2.0 g F127) enhanced compressive strength by 22.4% relative to pure MTMS aerogel, with 70.15% visible transmittance and thermal conductivity of 0.027 W/(m·K). These results demonstrate that multi-parameter formulation control can achieve a practical balance among mechanical robustness, optical transparency, and thermal insulation. This study provides a theoretical and process foundation for the engineering application of high-performance transparent thermal insulation materials.
✓ 已验证
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 1
·11-22
·
IF 0.88
Zhi Dongyan,Li Xiangye,Xu Shouhong,Liu Honglai
Microparticles with a core–shell structure were synthesized from SiO 2 particles as core and thermally sensitive hyaluronate–poly( N -isopropylacrylamide) (HA–PNIPAM) hydrogel as shell. The SiO 2 –HA–PNIPAM microparticles were injectable at room temperature and assembled to settle on to biosurfaces. Dynamic light-scattering measurements at different temperatures showed that the temperature-dependence of the diameters ( d ) of SiO 2 –HA–PNIPAM microparticles was reversible. d decreased abruptly when the temperature was increased to their lower critical solution temperature of 307 K. The Mw of HA and the extent of modification by glycidyl methacrylate, D
m , had clear effects on the sizes of the microparticles and their thermal sensitivity. Fluorescein, selected as model drug, was encapsulated in the gel shell to study the dynamics of drug release by this microparticle at body temperature.
研究领域:
生物材料学
·
组织工程
·
药物递送系统
·
纳米医学
·
再生医学
·
高分子科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
GLASS PHYSICS AND CHEMISTRY
·
2025
·Vol. 50
·期 5
·511-520
·
IF 0.6
Sihao Jian,Xia Chenkang,Hao Mingyuan,Liu Weihai,Ma Chao,Miao Yang
Silica aerogel has rec eived more and more attention in the field of thermal insulation. However, the poor mechanical properties and high temperature instability of pure silica aerogels seriously restrict the development and application of silica aerogels. Fiber reinforcement is an effective way to improve the mechanical properties of silica aerogels. In this paper, Al 2 O 3 –SiO 2 aerogel was compounded with mullite fiber to prepare silicon–aluminum aerogel fiber felt. When the strain value reaches 30%, the compressive strength of the fiber felt with aerogel content of 50.1 wt % reaches 0.21 MPa, and the thermal conductivity of fiber felt decreases from 0.0425 to 0.0322 W/m K when the aerogel content increases to 50.1 wt %. The thermal insulation performance test of fiber felt also showed that the addition of aerogel could significantly improve the heat insulation of fiber felt, and the cold surface temperature of fiber felt was only about 33°C when the flame exceeding 1000°C calcined the fiber felt for 10 s. This work provides a simple solution to prepare aerogel/nanofiber felt with good mechanical properties and low thermal insulation. Highlights: silicon–aluminum composite aerogel felt (AS/ASNFAs) has been prepared by sol-gel and impregnation method, AS/ASNFAs has good mechanical properties (the compressive strength reaches 0.21 MPa) and thermal insulation (0.0322 W/m K), AS/ASNFAs has good flame retardancy, and it remains stable after being burned at 1000 degrees butane for 10 min.
研究领域:
材料科学
·
纳米技术
·
热工学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shun Wang,Qiang Yu,Xu Wang,Cheng Jiang,Kun Guo,Hongpei Wang,Haiqin Deng,Jian Wu,Kai Zhang,Ziyang Zhang
Since its inception as the cornerstone of the ultrafast pulse laser, semiconductor saturable absorber mirrors (SESAMs) have attracted considerable interest. Meanwhile, low-dimensional (LD) materials based saturable absorbers (SAs) are gaining popularity in pulsed laser applications due to their high nonlinearity, strong light-matter interaction, and low cost. Here, high-quality LD-SAs have been created by transferring 2 H-TaS 2 onto gold mirrors and covered with plasma-enhanced chemical vapor deposition (PECVD) SiO 2 layers. The non-linear transmission of SiO 2 passivated TaS 2 -SAM was measured using a balanced dual-detector technology. The modulation depth and saturated intensity were ~8.4% and 0.86 MW·cm −2 . Based on the SiO 2 passivated TaS 2 -SAM, Q-switched and mode-locked Erbium-doped (Er 3+ -doped) fiber pulse lasers have been successfully achieved. Stable soliton pulses are obtained in erbium-doped fiber lasers (EDFLs) with pulse width of 1.8 ps, repetition rate of 3.4 MHz and a center wavelength of 1560.6 nm. Moreover, the mode-locking laser exhibited long-term stability with high signal-to-noise ratio of 63 dB. This study serves as a standard for low-dimensional materials research in photonics applications, and the results reveal that TaS 2 -SAM has a wide range of applications in multifunctional all-fiber lasers.
研究领域:
光子学
·
光学工程
·
超快激光
·
纳米材料
·
光纤光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2026
·Vol. 16
·期 22
·19752-19762
·
IF 6.1
Liang Chen,Lulu Fang,Haitao Lin,Yanzhe Ge,Yuan Cheng,Jianquan Wang
The global prevalence of gingivitis has raised the cost considerably for extensive healthcare and refractory management, which is often accompanied by excessive accumulation of reactive oxygen species (ROS) that are considered to play a pivotal role in the development of gingivitis and other inflammatory diseases. Ordinary medications for the treatment of gingivitis, such as chemical anti-inflammatory or antimicrobial agents, are sometimes unsatisfactory due to rapid pathogen consumption and metabolism. To this end, new strategies and platforms are thus needed for the treatment of such ROS-related diseases. Herein, Mn3O4@SiO2 NPs were designed and prepared through an in situ templating method and were found to possess over 2.5 times the in vivo antioxidant removal capacity and a 3-fold TNF (tumor necrosis factor)-α sequestration efficacy when compared with Mn3O4 NPs at the same concentration of Mn3O4. This was achieved through efficient catalytic ROS scavenging, thanks to the enlargement of the surface area and the enhanced dispersity and stabilization of the mesoporous SiO2-supported Mn3O4 NPs. Furthermore, 65% of the IL (interleukin)-1β was down-regulated by the Mn3O4@SiO2 NPs compared with an untreated gingivitis mouse model group, and in contrast, the IL-1β suppression rate for the iso-stoichiometric Mn3O4 NPs was about 85%. The multi-enzyme mimicking Mn3O4@SiO2 NPs provided satisfactory biosafety and therapeutic effects in a gingivitis mouse model and thus represent a promising therapeutic platform for treating gingivitis and other inflammatory diseases.
✓ 已验证
DOI
PubMed
高影响因子
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