Coatings
·
2022
·Vol. 12
·期 10
·1397
·
IF 3.236
Meiman Peng,Liqin Wang,Lang Guo,Jinyi Guo,Liping Zheng,Fuwei Yang,Zhuang Ma,Xing Zhao
Water can trigger freeze–thaw cycles, acid rain corrosion, and microbial colonisation, all of which destroy stone. Water is one of the most influential factors in the destruction of outdoor stone heritage. Therefore, materials with excellent hydrophobic properties and durability are urgently required to effectively retard long-term stone weathering. In this study, two nanoparticles, TiO2and SiO2, were used to modify dodecyltrimethoxysilane (DTMS), a waterproof coating commonly used for stone heritage protection, to fabricate nanocomposite superhydrophobic coatings. The micromorphology, water repellence (water contact angle and capillary water absorption), suitability to protect stone heritage (color change and water vapor permeability), and durability (thermal, light, and chemical stability) of DTMS and nanocomposite coatings were evaluated. The scanning electron microscope (SEM) images revealed that adding 0.5% (w/w) SiO2produced nanoscale roughness on the sandstone surface, leading to superhydrophobicity. The results of ultraviolet -visible (UV–Vis) spectrophotometer showed that adding 0.01% TiO2shielded more than 90% of UV light but accelerated the decrease in the contact angle under UVA irradiation. The addition of SiO2was able to avoid the detrimental effect of TiO2under UV light. The thermogravimetric analysis (TGA) results showed that both SiO2and TiO2nanoparticles improved the thermal stability of the coatings. In particular, the fabricated nanocomposite coating, SiO2and TiO2co-modified DTMS, had excellent water repellence, low color change and outstanding durability, and retained about 85% of the water vapor permeability of the stone, showing promise for stone protection.
研究领域:
材料科学
·
文化遗产保护
✓ 已验证
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Yiwen Hong,Jing Chen,Dahu Yao,Xiping Gao,Chang Lu,Xinchang Pang
Nanoparticle reinforcement in hydrogels is typically limited by low loading levels, which restricts their mechanical enhancement and fails to endow intrinsic antifreeze capability. Here, we break this paradigm by incorporating exceptionally high contents of nano-silica (SiO 2 ) into polyacrylamide (PAM) hydrogels, forming a nanoscale hard–soft dual-network structure. The resulting hydrogels exhibit remarkable mechanical robustness (tensile strength 5.37 MPa, compressive strength 305.52 MPa, tearing strength 1.48 MPa) and retain superior flexibility at −20 °C (tensile strength 11.4 MPa, elongation at break 654%), demonstrating intrinsic antifreeze performance. Mechanistic studies reveal that abundant hydrogen bonding between SiO 2 , PAM chains, and water molecules, coupled with nanoscale confinement, effectively reduces the freezable water fraction. Moreover, high SiO 2 loading imparts dual rheological behaviors to the precursor solution, enabling both solid-like processability and fluid-like flowability. Notably, the nanocomposite hydrogels possess outstanding wear resistance in the dry state and maintain relatively high friction coefficients underwater, ensuring stable gripping under wet conditions. This work establishes a universal high-loading nanoparticle strategy for constructing hydrogels that integrate mechanical strength, antifreeze capability, and multifunctionality, opening new opportunities in flexible electronics, soft robotics, and extreme-environment protection.
✓ 已验证
产品关联
DOI
高影响因子
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
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
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.
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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
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
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
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
Polymers
·
2026
·Vol. 18
·期 15
·1888
·
IF 5.8
Xinxin Li,Chaoqun Ji,Youjia Yang,Kaisheng Zeng,Lihui Chen,Jianguo Li,Yonghao Ni,Bin Chen
Developing sustainable and scalable personal thermal management textiles that simultaneously provide radiative cooling, moisture comfort, and responsible end-of-life management remains challenging. Here, we report a sustainable, scalable, and recyclable bamboo dissolving pulp-derived cellulose/SiO2fiber (CSF), fabricated by a wet-spinning process involving the dissolution and regeneration of cellulose and nano-SiO2. The resultant CSF exhibits a hierarchical interface-pore structure, which enhances solar scattering (up to 94.56% in 0.4–1.0 μm) by Mie scattering of nano-SiO2particles and multiple scattering at micro- and nanopore-induced air/cellulose/SiO2interfaces. By coupling high mid-infrared emissivity of 94.8% (8–13 μm), the CSF demonstrates average daytime sub-ambient cooling of 9.5 °C under hot and humid summer conditions. More importantly, the CSF presents a multiscale water-transport network that integrates molecular water capture (–OH groups), capillary infiltration (nanoscale interfaces between nano-SiO2and cellulose), and liquid spreading and evaporation (interconnected microchannels between fibers), which realizes larger liquid diffusion area and water-vapor transmission rate (7.55 cm2and 175.48 g m−224 h−1), compared to commercial cotton and polyester. In addition, the CSF demonstrates desirable soil-biodegradation capability, while the feasibility of closed-loop reuse is demonstrated through a single recycling cycle, supporting environmentally friendly wearable cooling textiles. The wet-spinning strategy paves the way for the construction of sustainable, scalable and recyclable fiber for thermal- and moisture-comfort textiles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2026
·Vol. 9
·期 33
·15984-15997
·
IF 5.8
Wang Bo,Wang Tong,He Yidan,Zhang Xiaojuan
Dielectric constant modulation and
heterointerface engineering
are considered efficacious strategies to construct high-performance
electromagnetic wave (EMW) absorption. Herein, a series of dual-phase
nickel sulfide (NiS 2 /Ni 3 S 4 ) hierarchical
microspheres decorated with diverse contents of silicon dioxide (SiO 2 ) nanospheres have been successfully synthesized via the Stöber
method and subsequent solvothermal process. Profiting from the rational
dielectric constant regulation, the NiS 2 /Ni 3 S 4 /SiO 2 -1 composites achieve an optimal RL
value of −66.6 dB at 2.09 mm and the broadest effective absorption
bandwidth (EAB) of 6.28 GHz at 2.18 mm within a filler loading of
20 wt %, far superior to that of pure NiS 2 /Ni 3 S 4 composites. When the content of absorber increases
to 25 wt %, the microwave absorption properties of NiS 2 /Ni 3 S 4 /SiO 2 -1 composites are the
utmost, further verifying the importance of a reasonable addition
amount of SiO 2 nanospheres. It is concluded that the introduction
of SiO 2 nanospheres can not only expand the heterogeneous
interface but also improve impedance matching by regulating the dielectric
constant. Furthermore, the results of radar cross section (RCS) simulation
demonstrate the dissipative capability for radar signals in practical
applications. The findings furnish a viable pathway for exploring
broadband microwave-absorbing materials.
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产品关联
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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