Materials
·
2025
·Vol. 18
·期 7
·1626
·
IF 3.2
Kaiyue Huang,Ji Zhang,Yue Li,Hui Yang
Surface treatment is essential for cementitious materials. Siloxane is a material that can potentially be applied in surface treatment, as it possesses the advantages of both inorganic and organic surface treatment materials for cement. Organotin, serving as a neutral catalyst, performs well in improving the performance of siloxane coating. In this work, the effect of organotin on the surface treatment performance of siloxane was studied for application in cementitious materials, including surface hardness and waterproofing properties. Organotin had little effect on the waterproofing of cement paste treated with siloxane. However, the addition of organotin positively impacted the surface hardness of cement paste treated with MTMS, which increased by 105.1%. The function of organotin was analyzed through XRD, FTIR, SEM, and pore structure characterizations. Organotin can speed up the gelation of siloxane, thus consuming more portlandite in cement. The negative effect of the alkyl group could be partially reduced by promoting the condensation of the alkoxy group. This indicated that treating siloxane with organotin is valuable for improving the durability of cement-based materials, increasing their surface hardness without affecting waterproofing.
研究领域:
建筑材料
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6290
·
IF 3.1
Chunlei Dong,Xuanzhi Mao,Minglei Wang,Maojiang Zhang,Jianbing Chen,Jiangtao Hu,Guozhong Wu
Heat-resistant, highly surface-hardened, and transparent composites of poly(methylmethacrylate) (PMMA) play a significant role in modern devices. However, conventional PMMA-based composites with high nanoparticle loadings often compromise transparency for high surface hardness and heat resistance due to nanoparticle aggregation and poor interfacial compatibility. In this work, we successfully fabricated an exceptional composite (MSiO 2 /PMMA composites) with high transparency, superior heat resistance, and high surface hardness using γ-ray irradiation-induced polymerization of methyl methacrylate (MMA) containing uniformly dispersed SiO 2 that was modified by 3-methacryloxypropyl trimethoxysilane and trimethylchlorosilane. Specific silanes were utilized for polarity regulation to reduce the agglomeration of SiO 2 nanoparticles and improve compatibility with MMA. Compared to pure PMMA, the 40-MSiO 2 /PMMA composite sample exhibited significantly improved thermal stability in terms of the temperature at 10% weight loss ( T 10% ), glass transition temperature ( T g ), and decreased coefficient of thermal expansion (CTE). Furthermore, this composite achieves a very high surface hardness (pencil hardness of 6H versus H for pure PMMA) while maintaining transparency similar to PMMA. These MSiO 2 /PMMA composites open up new avenues to enhance the performance and durability of materials used in various industries such as electronics, optics, automotive, and aerospace.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CULTURAL HERITAGE
·
2025
·
IF 3.3
Ming Wu,Zhenzhen Ma,Zhang He,Jinghan Ding,Xichen Zhao,Encarnacion Ruiz-Agudo,Carlos Rodriguez-Navarro,Jinmeng Zhu,Xuanhua Li
Mural paintings reflect valuable spiritual and cultural achievements of human civilizations and serve as crucial evidence for studying ancient customs, rituals, and clothing. However, deterioration of the mural plaster layer results in a decrease in the mural’s mechanical strength, thus posing a serious threat to its preservation. Nanolime (NL) is currently one of the most widely studied inorganic nanomaterials for the consolidation of cultural heritage in general, and mural paintings in particular, due to its excellent compatibility. However, there is limited research on the application of NL for consolidating the plaster layer of mural paintings. Here, we focus on ancient tomb mural paintings (ca. 1000 CE), investigating the consolidation performance of NL for its plaster layer. NL is homogeneously synthesized in the presence of additives and subjected to size-selection through centrifugation, yielding a narrowly distributed particle size of ∼40 nm—markedly smaller than the ∼180 nm obtained without centrifugation (NL-C). This novel NL is subsequently applied to the plaster layer of the tomb mural exhibiting limited impact on its pore structure and good penetration depth (1.2∼3.5 mm), which is significantly deeper than that observed in samples consolidated with NL-C (∼1 mm). More importantly, after consolidation with NL, the surface hardness of the plaster layer increases by ∼56 %, and the surface weight loss decreases by ∼67 %, demonstrating an effective consolidation performance. This study provides technical and methodological support for the application of NL in the preservation of ancient tomb murals.
研究领域:
文化遗产保护
·
材料科学
·
考古学
·
古代建筑技术
·
无机纳米材料应用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 4
·1862-1873
·
IF 2.3
Yan Huanyuan,Liu Wensheng,Ma Yunzhu,Wang Tao,Wu Lei,Yang Lun,Tang Siwei
In this work, Al 2 O 3 ceramic coatings were prepared the surface of powder metallurgy (PM) 2024 aluminum alloy via the micro-arc oxidation (MAO) technique. The effects of the current density and the oxidation treatment time on the microstructure and properties of the MAO coatings were investigated. The results reveal that the oxide film mainly comprises the γ-Al 2 O 3 phase, the amorphous Al 2 O 3 phase, and a small amount of the mullite phase. There are traces of W in the coatings, which exist in the form of W, WO 3 , and W 18 O 49 . With increasing current density, the thickness and surface roughness of the MAO coatings prepared on the PM 2024 alloy increase, while their surface hardness first increases and then decreases. The increase in the current density promotes the transformation of the amorphous Al 2 O 3 phase into the γ-Al 2 O 3 phase. The maximum hardness value of 1270 HV is obtained at a current density of 20 A dm −2 . The MAO coatings provide superior corrosion protection for the PM 2024 aluminum alloy, and the MAO coatings obtained at a current density of 15 A dm −2 exhibit the highest corrosion resistance.
研究领域:
材料科学
·
表面工程
·
陶瓷涂层
·
腐蚀防护
·
铝合金
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2025
·
IF 2.4
Na Li,Qiao Li,Yongchao Zhu,Huizhong Ma,Lan Zhang
To enhance the surface hardness and strength of aluminum alloys and achieve low-temperature synthesis of aluminum-graphene composite materials, Al-Graphene composite coatings are electrodeposited on the 7075-aluminum alloy substrate from organic solvent solution system at 25 ℃ containing different graphene concentration. The morphology, microstructure and mechanical properties of Al-Graphene composite coating were characterized and reconnoitered. Al-Graphene composite coatings exhibit improved performance significantly. Under the optimal graphene concentration of 7 g L −1 , Al-Graphene shows 5.1-times increase in hardness in comparison with pure Al coating. The elastic modulus has the peak value of 84.4 GPa for Al-Graphene containing 10.64 wt% graphene, which has an increment of 66.2 % compared with pure Al coating. These put down to the remarkable mechanical property of graphene. Moreover, the content and distribution of graphene play a key role in the mechanical properties of Al-Graphene. The alternating well-dispersed graphene and reduced metal layer, simultaneously keep appropriate thickness of reduced metal layer is able to achieve the optimal comprehensive mechanical property, which exhibits promising application potential in aircraft skins, automotive components, and related fields.
研究领域:
材料科学
·
机械工程
·
表面工程
·
纳米技术
·
航空航天工程
·
汽车工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Qiuqin Lin,Peng Jiang,Suhong Ren,Shiqin Liu,Yaohui Ji,Yuxiang Huang,Wenji Yu,Gaëlle Fontaine,Serge Bourbigot
Degradable and sustainable materials are needed to reduce pollution and energy consumption. Bamboo, an inexpensive and abundant resource, can be used to develop such materials. To this end, we demonstrate two types of bamboo-fiber-based functional materials. The first can be used as structural materials with outstanding anti-mildew properties (ultra-high tensile strength: 571 MPa; compressive strength: 191 MPa; surface hardness: 227 MPa) and is produced with long and aligned bamboo cellulose I fibers mixed with epoxy. The second is suitable for electrodes in wearable devices (areal capacitance: 2032 mF cm −2 ; linear capacitance: 670 F cm −1 ; energy density: 139.3 µWh cm −2 ; power density: 80.4 µW cm −2 ) and uses nickel-coated bamboo cellulose II fibers. The design strategies of bamboo-fiber-based functional materials demonstrated in this study provide new insights for novel degradable and sustainable functional materials.
研究领域:
材料科学
·
可持续性
·
纳米技术
·
复合材料
·
可穿戴技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）