ADVANCED MATERIALS
·
2025
·
IF 26.8
Wei Li,Xuetao Xu,Dezhao Hao,Zhao Wang,Yu Kang,Jiankun Lai,Feilong Zhang,Lei Jiang,Shutao Wang
Wooden artifacts have attracted comprehensive concern as the witnesses of human civilization; however, their conservation suffers from many difficulties, such as natural degradation and biological invasion. Silicified wood, as a fossil material that has existed for millions of years, provides a valuable clue for the long-term conservation of wooden materials. In this work, a superwetting-enabled in situ silicification strategy is reported to silicify wood in a confined way, fabricating artificial silicified wood within 100 h. The superwetting process of the silica sol enables multi-scale high silica filling throughout the entire wood from the nanoscale to the macroscale. The artificial silicified wood shows a high flexural strength of ≈216.49 MPa and super resistance against termites and fungi. The artificial silicified wood retains 98.70% of its mass against termites, and over 90.64% of its mass against fungi, meeting the safest level in the global standards. The finding provides a general silicification approach for wood-like materials with complex hierarchical structures and a promisingly alternative solution for the conservation of wooden artifacts.
研究领域:
材料科学
·
文物保护
·
林业科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Miaojun Huang,Hao Zhong,Liuzhang Ouyang,Chenghong Peng,Xiaoke Zhu,Weiheng Zhu,Fang Fang,Min Zhu
The application of NaBH 4 hydrolysis to hydrogen generation is currently obstructed by its regeneration. Finding a simple and low cost method to regenerate its hydrolysis byproduct is therefore important. Herein, the regeneration of NaBH 4 is obtained by reacting its direct hydrolysis byproduct, NaBO 2 ·2H 2 O, with a mixture of Mg and Mg 2 Si by ball milling. In this reaction, the reduced agents are only metal and intermetallic compounds , thus hydrogen in the regenerated NaBH 4 (H δ− ) derives solely from NaBO 2 ·2H 2 O (H δ+ ). The introduction of Mg 2 Si increases the NaBH 4 regeneration yield to 86%, which is the highest regeneration yield reported for NaBH 4 until now. The reaction mechanism was also clarified for the first time.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Yingying Zeng,Hao Liang,Jieru Pu,Lei Liu,Xiaolong Pan,Hao Luo,Zhenwei Niu,Wei Zhang,Liang Bian
Tungsten disilicide (WSi 2 ) is a promising material for high-temperature applications due to its excellent mechanical properties and superior thermal stability. This study aims to investigate the mechanisms underlying the performance enhancement of polycrystalline WSi 2 and tungsten silicide (W-Si) composites synthesized by high-temperature and high-pressure (HPHT) strategies, focusing on their phase composition and microstructure. The results show that high pressure can effectively reduce the synthesis temperature of the tungsten silicide system, with the phase composition and microstructure of the products being dominated by the treatment temperature. The high intergranular strain resulting from the reactive process and the HPHT environment facilitated the formation of high-density dislocations, including dislocation arrays and networks with multiple orientations, especially near the grain boundaries. Additionally, a 3-nm thick amorphous ribbons were identified between these boundaries. This microstructure, characterized by high-density dislocations and amorphous ribbons, confers exceptional mechanical properties and oxidation resistance. The differences in oxidation behavior between powder and bulk WSi 2 samples underscore the complex relationship between phase stability and material properties under varying processing conditions. These findings indicate that dislocations and amorphous ribbons can achieve in high-temperature ceramics with strong covalent bonding, which is essential for the design and synthesis of advanced W-Si-based ceramics.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 13
·5032-5038
·
IF 3.069
Yihan Sun,Jinxia Huang,Siyang Zhao,Zhiguang Guo
Herein, a simple, facile and versatile protocol was presented to fabricate water-resistant fabrics based on an in situ bio-silicification strategy and fluorinate-free modification. The whole fabrication procedure is green and avoids the need for any fluorinate-containing compounds, environmentally harmful organic solvents and high preparation temperature. The produced fabrics maintained robust lyophobic properties after multiple machine laundry cycles, repeated abrasion cycles, UV irradiation, and organic solvent and strong acid/base attacks. The obtained superhydrophobic fabrics exhibited repeatable self-repairing behaviour against repeated washing and oxygen plasma etching cycles. Our in situ biomimetic silicification strategy for developing robust self-repairing superhydrophobic fabrics using a waterborne fluorinate-free coating system well fits the motifs of green chemistry and will lead to the development of green preparation of other superwetting surfaces.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Z.H. Tan,L.Z. Ouyang,J.M. Huang,J.W. Liu,H. Wang,H.Y. Shao,M. Zhu
A convenient, high-density and low-cost hydrogen supply technology is essential to hydrogen energy system by providing hydrogen to fuel cell component. Magnesium silicide (Mg 2 Si) can be a good hydrolysis candidate due to its low cost and ability of releasing hydrogen gas during hydrolysis process. However, previous studies have demonstrated that Mg 2 Si could easily produce large amount of silanes during hydrolysis reaction, which may cause serious problem of explosive danger when in contact with air. Here it is the first time that Mg 2 Si was used for generation of hydrogen by a simple and convenient one-step hydrolysis reaction. In this study, hydrolysis kinetics and mechanisms of Mg 2 Si in NH 4 Cl and NH 4 F solutions were investigated. The silanes could be almost completely turned into hydrogen by introduction of fluorine ion during the hydrolysis reaction of Mg 2 Si, leading to very low silanes content in the produced hydrogen. The kinetic studies indicated that when the concentration of the NH 4 F solution increased to 13.0%, the hydrogen generation rate and the reaction yield were improved significantly and reached the best performance, producing 466 mL g −1 H 2 in 10 min and 616 mL g −1 H 2 in 30 min at 25 °C. The activation energy was calculated to be 37.3 ± 0.8 kJ mol −1 . Furthermore, the hydrogen yield and the hydrolysis rate of Mg 2 Si can be further improved by high-energy ball milling. After ball milling for 2 and 5 h, the hydrogen generation yield in 30 min increased to 698 and 771 mL g −1 , respectively, and the activation energy was decreased to 23.9 ± 0.6 kJ mol −1 and 12.9 ± 0.1 kJ mol −1 , respectively. The results revealed that NH 4 F can be a promising reagent for promoting the hydrolysis of Mg 2 Si for onsite hydrogen supply.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 33
·期 10
·1431-1441
·
IF 1.835
Zhao Wen,Lin Bao-ping,Zhang Xue-qin,Sun Ying,Yang Hong
We describe in this work an alkyne-hydrosilylation approach to synthesize a series of novel polysiloxane side-chain LCPs attaching end-on or side-on mesogenic side groups. Their properties are characterized by NMR, FTIR, gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, polarized optical microscopy and small-angle X-ray scattering. These obtained alkenylsilane linked novel LCPs exhibit higher glass transition temperatures and clearing points, and especially display the tendency of forming smectic phases, in strong contrast with the nematic phases of their comparative conventional alkylsilane linked analogues, which manifests more rigid features of the alkenylsilane linkages and their significant influence on the mesomorphic properties.
研究领域:
高分子化学
·
材料科学
·
液晶材料
·
有机合成
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yi Sun,Wenlong Sun,KangKang Zhang,Siyu Cui,Xiong Shao,Jian Qiu,Yushan Yang,Jun Li
In order to improve the specimens’ flame-retardant qualities, ethyl orthosilicate was impregnated into them using a combination of the delignification process and the in situ growing approach. Lignification has been demonstrated to increase the cellular gap of the specimen and to maximize the impregnation of ethyl orthosilicate. Moreover, the in situ growth method results in the combination of specimens containing silica manufactured from ethyl orthosilicate, thereby forming a composite material with enhanced flame-retardant properties. The examination of the changes in the properties of the specimens before and after modification was conducted using FTIR spectroscopy, XRD, XPS, SEM, and other experimental techniques. The modified specimens exhibited higher properties in comparison to the untreated specimens. Furthermore, the modified specimens exhibited enhanced mechanical properties, characterized by an augmented compressive strength of 34.9 MPa and a strength-to-weight ratio of 158 MPa·cm·g–1, in comparison to specimens that did not undergo the modification process. The results of experiments show that proposed green technology provides a new method for producing flame-retardant composites and could significantly improve the mechanical and flame-retardant qualities of wood.
研究领域:
材料科学
·
林业工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2015
·Vol. 33
·期 5
·578-582
·
IF 1.578
Minting Liang,Xiaofeng Xia,Xiang Liu,Hexing Li
In the presence of the inexpensive and non-toxic polymethylhydrosiloxane, the combination of copper(II) acetate and a chiral diphosphine displayed high catalytic efficiency in the asymmetric hydrosilylation of a series of aromatic ketones in air atmosphere and at room temperature. ( R )-1-Arylethanols were obtained with up to 99% yield and 93% enantiomeric excess. Meanwhile, the electron effect and steric hindrance of substituents on the aromatic ring had an interesting influence on both the yields and enantioselectivities. Furthermore, a possible mechanism was presented to explain the influence of some key factors on the reaction.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2023
·
IF 3.2
Jizhe Wu,Chenxin Jin,Guojun Xu,Huaide Chen,Bin Lu,Xiaomin Li,Fugen Sun,Lang Zhou,Zhihao Yue
Silicon monoxide (SiO x , 0 < x < 2) has been one of the new directions of scientific researchers because of some characteristics, such as higher theoretical specific capacity and lower volume expansion efficiency. However, its disadvantages such as the volume expansion effect and poor conductivity still exist in the process of charge and discharge, which limit its commercialization process. In this paper, cuprous oxide and carbon coated silicon monoxide (SiO x /C/Cu 2 O) composites were obtained by high temperature heat treatment. In the SiO x /C/Cu 2 O anodes, carbon can buffer the volume expansion of the lithium intercalation, enhance the conductivity of the material, reduce the contact between the electrolyte and the active substance, Cu 2 O can further reduce the contact between the electrolyte and the active substance, greatly buffer the change of electrode structure and improve the overall cycling performance. After the rate of 0.5C (1C = 2100 mA g −1 ) for 500 cycles, the discharge specific capacity is 704.0 mAh g −1 , about 350 mAh g −1 higher than SiO x , which shows excellent long-cycle ultra-high stability.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Li Jiawei,Hong Chengyu,Zhang Hao,Han Ye,Li Xin,Sun Ruonan,Zhou Chao
Polyvinyl chloride (PVDC) coatings require excellent adhesion to substrates. Herein, a series of self-cross-linking silylated polyvinylidene chloride (PVMBV) emulsions with core–shell structure were prepared by seed emulsion polymerization using vinylidene chloride (VDC), methyl acrylate (MA), butyl acrylate (BA), and acrylic acid (AA) as the raw materials. Vinyltrimethoxysilane (VTMO) as the cross-linker was employed to enhance the adhesive properties. The effects of various VTMO contents on the properties of PVMBV were investigated. The results showed that the adhesion performance and thermal stability of PVMBV films were enhanced significantly with the increasing VTMO content. More interestingly, the introduction of a small quantity of VTMO enhanced the toughness of PVMBV films. The water contact angle increased could prove that the hydrophobicity of PVMBV films was improved. Further, it is important to that barrier properties of PVMBV films were effectively improved when VTMO content was no more than 3 wt%. This work provides potential applications in multifunctional barrier coatings, such as vapor barrier, water barrier, weathering, and corrosion protection.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 39
·e54474
·
IF 3
Xiaohan Li,Qiunan Xie,Jieying Lin,Jiateng Huang,Kaili Xie,Jingcheng Liu,Xiaojie Li,Wei Wei
Epoxy resin (EP) has excellent comprehensive properties, but its inherent flammability limits its further application in high-end industries. The present study focuses on the preparation of an efficient phosphorus/silicon-containing flame retardant for improving the flame retardancy and smoke suppression of EP. The intermediate product ED was first obtained by the addition reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with eugenol, and then the target flame retardant DPSi-ED was synthesized by the Williamson etherification reaction between ED and dichlorodiphenylsilane. The flame retardant was further incorporated into EP/4,4′-diaminodiphenylmethane (DDM) system to prepare the modified epoxy thermosets. The flame-retardant performance and mechanism were investigated by limiting oxygen index (LOI) test, vertical combustion test, cone calorimetry, thermogravimetric analysis-infrared spectroscopy (TG-IR), and so forth. At the same phosphorus content (0.5 wt%), EP/DPSi-ED thermosets exhibited superior flame-retardant properties to EP/ED thermosets. Moreover, EP/DPSi-ED7 achieved a LOI of 35.3% and V-0 rating in UL-94 testing, and compared to EP/ED7, its peak heat release rate (pHRR) and total smoke production (TSP) were reduced by 31.5% and 10.9%, respectively. The phosphorus and silicon elements synergistically contributed to the formation of a stable char layer, which acted as a physical barrier to effectively enhance the flame-retardant properties of the thermosets. Meanwhile, the incorporation of DPSi-ED containing flexible Si O bonds and rigid DOPO groups to some extent also improved the mechanical properties of the cured EP. Hence, this study provides an effective strategy for the preparation of bio-based phosphorus/silica-containing high-efficiency and smoke-suppressing flame retardants.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yong Qin,Ali Reza Kamali
Layer-structured calcium silicide (CaSi 2 ) is prepared using a fast and clean combustion synthesis (CS) method, employing silica as the silicon source. The CS process was characterized by the occurrence of an ignition reaction at 510 °C, leading to the formation of CaO, CaSi 2 , Ca 14 Si 19 , and Ca 3 SiO 5 which is converted into CaSi 2 with minor amounts of Si after an acid treatment. The mechanism involved in the CS process is discussed. The structure and microstructure of the CS-CaSi 2 is characterized and compared with the commercial CaSi 2 , and the outcomes are discussed based on the Ca-Si binary phase diagram. In comparison with the latter, the CS-CaSi 2 has a considerably greater purity, with loosely stacked structure, providing a surface area of around 43 m 2 g −1 . The thermal analysis of the CS-CaSi 2 is conducted under high purity argon and air flow of 100 mL min −1 , comprising differential scanning calorimetry (DSC) and thermal gravimetric (TG) analysis. The analysis conducted under argon provides evidence for the occurrence of the melting event at 1037 °C. Under air, the material is almost stable below 800 °C, while the oxidation is detected at higher temperatures. The oxidation peak of the material is realized from the corresponding DSC thermogram to take place at 1028 °C. The oxidation event is suggested to occur through two stages. At the first stage (T < 1030 °C), the event can be explained by the oxidation of calcium content of CaSi 2 . The second oxidation stage taking place at higher temperatures can be related to the oxidation of Si, with a lower rate. The Li-storage performances of the commercial CaSi 2 and CS-CaSi 2 are evaluated.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）