CEMENT & CONCRETE COMPOSITES
·
2024
·
IF 10.8
Chen Liang,Mingxu Chen,Dongbing Jiang,Pengkun Hou,Deqiang Zhao,Shoude Wang,Ziyuan Yu,Piqi Zhao,Lingchao Lu
Developing hydrophobic agents that minimize the strength loss of bulk hydrophobic cementitious materials (BHCM) remains a formidable challenge. Substances such as siloxanes can hinder cement mineral hydration and prevent the formation of an initial network structure during the early hydration stages. In this study, a novel hydrophobic emulsion in which polydimethylsiloxane (PDMS) wrapped with modified nano silica (MNS) is designed to enhance the hydrophobic property of cementitious materials while minimizing strength loss. The results show that BHCM exhibits good hydrophobicity (water contact angle 121.8°) while significantly reducing strength loss (decreased by 10.3 %). The presence of MNS effectively shields PDMS from direct contact with cement minerals during the initial stages. Moreover, MNS can react with portlandite (CH) to generate C-S-H phase and optimize the pore structure of hardened cement pastes. This study contributes to promoting the structure-function integration of cement composites and achieving an extended service life for concrete.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Binbin Zhang,Jizhou Duan,Yanliang Huang,Baorong Hou
Nature-inspired superhydrophobic coatings with typical Cassie-Baxter contacts garner numerous interests for multifunctional applications. However, undesirable poor mechanical and thermal stability are still crucial bottlenecks for real-world employment. This work introduces a cost-effective, fluorine free and versatile strategy to achieve double-layered PDMS agglutinated candle soot coating with superior water-repellent superhydrophobicity. The surface morphologies, chemical compositions and wettability behaviors were investigated in detail. The mechanical stability, chemical stability and durable corrosion resistance of the fabricated PDMS-CS coating were evaluated through friction, calcination and electrochemical impedance spectroscopy. The results demonstrate a remarkably enhanced mechanical robustness and corrosion resistance, indicating PDMS units can act as an effective agglutinating agent between candle soot and underlying substrate. The synergistic effect of PDMS agglutination, porous network nanostructures and extremely low surface energy of incomplete combustion induced candle soot deposition contribute to the eventually robust corrosion resisting coating, which greatly increases the possibility for practical applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Guolong Lu,Hao Cui,Xiaohui Weng,Youhong Sun,Zhiyong Chang
Methane detection is important for exploring combustible ice in energy field. As the core component of the methane sensor, gas-liquid separation membranes play a crucial role in separating methane from water, which can effectively enhance the timeliness and stability of methane detection. Moreover, the correlative permeability and mechanical properties of are contradictory requirements for achieving optimum performance of membranes. Herein, a methane-water separation membrane was developed and optimized by adjusting the PEG as porogen based on PDMS and PES as functional and support layers, respectively. PDMS/PES composite membrane performed an excellent methane permeability and tensile strength . Particularly, the PEG was studied as porogen to affect the morphology and adjust pore structure of the PES layer. Considering the trade-off of methane permeability and mechanical properties , the results indicate the appropriate content of porogen is 4 wt% PEG. This work optimizes a new approach to prepare methane-water separation membrane and give a significant insight to develop methane detection for exploring new energy in seabed.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yeye Liu,Leilei Zhang,Fei Zhao,Chang Li,Hongchao Sheng,Hejun Li
Paper with simultaneous fire-resistance and hydrophobicity have greatly potential applications in the fields of packing, storage and delivering information, which attracts increasing attention recently. Different from the traditional cellulose-based paper which is extremely easily damaged by water and fire, a new type of highly flexible, fire-resistant and hydrophobic paper based on Si 3 N 4 nanowires and polydimethylsiloxane (PDMS) is reported. Specially, the Si 3 N 4 @PDMS core-shell nanowires with 3D interlocking structure are designed, in which the Si 3 N 4 nanowires act as the inorganic fire-resistant frameworks and the PDMS shell with low surface energy provides the hydrophobic surface . The Si 3 N 4 @PDMS core-shell nanowires are intertwined and interlaced to form a highly flexible Si 3 N 4 @PDMS paper. The tensile strength of Si 3 N 4 @PDMS paper is 6.19 MPa, indicating the good mechanical property. The obtained Si 3 N 4 @PDMS paper has the characteristics of writability, fire-resistance and hydrophobicity. The high thermal stability of Si 3 N 4 nanowires makes Si 3 N 4 @PDMS paper exhibit excellent fire resistance. No obvious change is observed for the commercial paper with Si 3 N 4 @PDMS paper as the fire-shielding layer after heating for 30 min. In addition, the contact angles of water droplets are all greater than 110° over the surfaces of Si 3 N 4 @PDMS paper after mechanical damages, chemical corrosions and thermal treatments. Si 3 N 4 @PDMS paper can be used in oil/water separation and oil collection. More importantly, Si 3 N 4 @PDMS paper can be used for writing without being damaged by fire or water. The present work may inspire the development and application of functional paper and is expected to become a breakthrough in the traditional paper industry.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2023
·Vol. 9
·期 5
·405
·
IF 4.6
Feng Liu,Xin Di,Xiaohan Sun,Xin Wang,Tinghan Yang,Meng Wang,Jian Li,Chengyu Wang,Yudong Li
The persistent challenge of removing viscous oil on water surfaces continues to pose a major concern and requires immediate attention. Here, a novel solution has been introduced in the form of a superhydrophobic/superoleophilic PDMS/SiO2aerogel fabric gathering device (SFGD). The SFGD is based on the adhesive and kinematic viscosity properties of oil, enabling self-driven collection of floating oil on the water surface. The SFGD is able to spontaneously capture the floating oil, selectively filter it, and sustainably collect it into its porous fabric interior through the synergistic effects of surface tension, gravity, and liquid pressure. This eliminates the need for auxiliary operations such as pumping, pouring, or squeezing. The SFGD demonstrates exceptional average recovery efficiencies of 94% for oils with viscosities ranging from 10 to 1000 mPa·s at room temperature, including dimethylsilicone oil, soybean oil, and machine oil. With its facile design, ease of fabrication, high recovery efficiency, excellent reclaiming capabilities, and scalability for multiple oil mixtures, the SFGD represents a significant advancement in the separation of immiscible oil/water mixtures of various viscosities and brings the separation process one step closer to practical application.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Qin Liu,Yan Wang,Zhi Guo,Siyuan Wu,Wancheng Li,Chuanrun Li,Bo Wu
One of the main challenges in oil–water separation of traditional Chinese medicines (TCM) is to obtain essential oils from the aromatic water of TCM. In this study, silicon dioxide/polyvinylidene fluoride (SiO 2 /PVDF) membranes were prepared using nonsolvent induce phase separation. Then polydimethylsiloxane (PDMS) was coated to obtain PDMS/SiO 2 /PVDF membranes. Separated essential oils and water from aromatic water in the gaseous state by vapor permeation membrane separation technology. The relationship between membrane structure and membrane separation effect was investigated. Response surface methodology was used to develop a quadratic model for the separation factor, membrane permeation separation index and membrane preparation process. The optimal process parameters for the membrane separation were 12.31% (mass) concentration of PVDF solution, 9.6% (mass) of N,N -dimethylacetamide in the solidification bath, and 0.2 g hydrophobic nano-SiO 2 incorporation, with a separation factor of 14.45, and a membrane flux of 1203.04 g·m –2 ·h –1 . Compared with the PDMS/PVDF membranes, the separation factor and membrane flux were increased by 68.59% and 3.46%, respectively. Compared with the SiO 2 /PVDF membranes, the separation factor and membrane flux were increased by 478% and 79.33%, respectively. Effectively mitigated the limitations of traditional polymer membrane material performance affected by the “trade-off” effect. Attenuated total internal reflection-Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy and energy dispersive spectroscopy were used to characterize the PDMS/SiO 2 /PVDF membranes, and gas chromatography was used to characterize the permeate. In addition, the contents of L -menthol, L -menthone, menthyl acetate and limonene in the permeate, conformed to the European Pharmacopoeia standards . This study provided an effective preparation strategy of a feasible hydrophobic powder polymer membrane for the separation of essential oils from gaseous peppermint aromatic water.
研究领域:
材料科学
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中药学
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiangshuai Li,Siyang Tanyan,Songjiang Xie,Rong Chen,Qiang Liao,Xun Zhu,Xuefeng He
Solar driven interfacial evaporation has caught the eyes of global researchers in the past few years due to its outstanding vapor generation ability by using clean solar energy. Extensive investigations have been carried out to explore solar absorber/receiver materials for efficient photothermal conversion and heat concentration at the water-air interface. However most of the presented solar absorber materials are expensive and the preparation processes are often complicated. Here we proposed a polydimethylsiloxane (PDMS) sponge with three-dimensional porous structure embedded with carbon nanoparticles (CNPs) as the solar absorber for solar driven interfacial evaporation. The proposed PDMS-CNPs sponge can be easily prepared through a simple procedure. Characterization results indicate the fabricated PDMS-CNPs sponge has microscale 3D porous structure with ideal optical absorption in visible/near-infrared (NIR) wavelength and good water transport ability after surface modification. The solar driven evaporation performance of the proposed PDMS-CNPs sponge was evaluated under different working conditions. In floating condition, the vapor evaporation rate and solar-vapor conversion efficiency at one sun radiation intensity could reach 1.36 kg/m 2 ·h and 77.8 %, respectively. Effects of light intensity, sponge thickness, and seawater salinity were also investigated. The PDMS-CNPs sponge has exhibited excellent solar driven evaporation performance and good compatibility under different operation conditions. With its great potential in solar energy harvesting and vapor generation, it can be wide applied in researching/industrial scenarios.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yuan Wang,Yuanbo Cai,Youquan Ling,Haoruo Zhang,Jinfeng Tian,Zhengguang Heng,Shengtai Zhou,Shuang Xia,Mei Liang,Huawei Zou
Flexible thermal protection materials with excellent mechanical and ablative properties were one of the key components in promoting the development of a new generation of aircraft. In the present work, a robust, strongly adhesive, and ablation-resistant PDMS coating was prepared through the covalent connection between PDMS and vinyl-functionalized epoxy resin (EAP) by hydrosilylation. The EAP synthesized by molecular design was uniformly dispersed in the PDMS matrix as an island phase-separation structure. The tensile strength, elongation at break, and shear strength of EAP-modified PDMS (EAP@PDMS) were significantly increased by 575%, 155%, and 183%, respectively, when compared with pure PDMS. Besides, the linear ablation rate (LAR) of EAP@PDMS was greatly declined, which was 80.1% lower than that of pure PDMS, exhibiting excellent ablation resistance. This work opened an avenue toward developing flexible thermal protection coatings with excellent mechanical and ablative properties for aerospace applications.
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 1
·37
·
IF 4.8
Lin Deng,Weili Deng,Tao Yang,Guo Tian,Long Jin,Hongrui Zhang,Boling Lan,Shenglong Wang,Yong Ao,Bo Wu,Weiqing Yang
Piezoelectric wearable electronics, which can sense external pressure, have attracted widespread attention. However, the enhancement of electromechanical coupling performance remains a great challenge. Here, a new solid solution of Ba1−xSrxSn0.09Ti0.91O3(x= 0.00~0.08) is prepared to explore potential high-performance, lead-free piezoelectric ceramics. The coexistence of the rhombohedral phase, orthorhombic phase and tetragonal phase is determined in a ceramic withx= 0.06, showing enhanced electrical performance with a piezoelectric coefficient ofd33~650 pC/N. Furthermore, Ba0.94Sr0.06Sn0.09Ti0.91O3(BSST) is co-blended with PDMS to prepare flexible piezoelectric nanogenerators (PENGs) and their performance is explored. The effects of inorganic particle concentration and distribution on the piezoelectric output of the composite are systematically analyzed by experimental tests and computational simulations. As a result, the optimalVOCandISCof the PENG (40 wt%) can reach 3.05 V and 44.5 nA, respectively, at 138.89 kPa, and the optimal sensitivity of the device is up to 21.09 mV/kPa. Due to the flexibility of the device, the prepared PENG can be attached to the surface of human skin as a sensor to monitor vital movements of the neck, fingers, elbows, spine, knees and feet of people, thus warning of dangerous behavior or incorrect posture and providing support for sports rehabilitation.Keywords:flexible piezoelectric sensor;BSST particles;piezoelectric composites;BSST/PDMS;human motion monitoring
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yue Sun,Huhu Zhao,Heng Mao,Mengxue Duan,Kun Wang,Nanbin Bao,Zhi-Ping Zhao,Huanjun Li
Superhydrophobic mixed matrix membranes (SMMMs) are very desirable for efficient separation of biofuel recovery from the fermentation broth via pervaporation. In this work, hydrophobic silica hollow spheres (SHSs) were elaborately prepared by template method and subsequent silane modification. The resulting SHSs were incorporated into polydimethylsiloxane (PDMS) matrix to construct superhydrophobic SHSs/PDMS MMMs. The superhydrophobic composite membrane with 15 wt% SHS contents showed a water contact angle of up to 160°, with low sliding angle of less than 5°. As a result, for the permselective pervaporation of 1 wt% acetone aqueous solution at 35 °C, the optimized composite membrane with separation factor of 46 increased by 256%, and maintained a comparable total flux compared with the pure PDMS membrane. The slight decrease of the total flux was mainly attributed to the reduced water partial flux resulting from water repellency of the superhydrophobic membrane surface. Thus, our proposed strategy of constructing superhydrophobic composite membranes may provide new insights into the development of high-performance pervaporation membrane for biofuel recovery.
研究领域:
材料科学
·
化学工程
·
生物燃料技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2022
·Vol. 147
·期 16
·3723-3731
·
IF 5.227
Jianhua Liu,Hui Chang,Xiangyu Zhang,Shimeng Chen,Yongxin Song,Dongqing Li
Building an optical filtration function into a microfluidic chip is a promising way of simplifying the optical detection system of a microfluidic device. In this paper, a PDMS microfluidic chip filter that is capable of transmitting chlorophyll fluorescence and blocking interfering light in the visible wavelength range was developed for living algae detection with a smartphone. The chip was fabricated by sealing a layer of crystal violet solution in a PDMS layer on the top of the Sudan II-doped PDMS slab, which has a straight microchannel. Optimum dye concentrations and thicknesses for the crystal violet solution layer and Sudan II-doped PDMS slab were investigated and determined by spectrum measurements. It was found that the cut-on range of this integrated microfluidic chip is extended to about 625 nm and the transmittance in the chlorophyll fluorescence range (650 nm to 710 nm) is as high as 95%, when 25 mg L−1 Sudan II-doped PDMS slab (with a 3 mm thickness) and 2 mg L−1 crystal violet solution (with a 0.3 mm thickness) were used. Living algae detection using this chlorophyll-fluorescence-filtering PDMS microfluidic chip and a smartphone-based imaging platform was achieved, and the results compared favorably with those using a commercial filter.
研究领域:
生物技术
·
光学检测
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Hui Wang,Sihan Tang,Yunxia Ni,Chongrui Zhang,Xiangwei Zhu,Qiang Zhao
Interface compatibility between hydrophilic metal-organic frameworks (MOFs) and hydrophobic polydimethylsiloxane (PDMS) is less effectively reconciled through supramolecular modifications such as surfactant and polymer wrapping. Here we report a covalent cross-linking strategy to strengthen MOFs ~ PDMS interfaces. Zirconium MOFs (UiO-66-NH 2 ) were modified with trimethoxysilan (TMS), which could further react with silanol terminated PDMS to enhance UiO-66 ~ PDMS interface compatibility. High content UiO-66-TMS (up to 50 wt%) were loaded into PDMS while retaining good membrane formation ability, mechanical properties and pervaporation selectivity, in contrast to pristine UiO-66-NH 2 that decreases membrane strength and separation performances even at much lower loading content (10 wt%). Flux of mixed matrix membranes in dehydrating ethanol-water mixtures was highly improved while retaining the selectivity. It allows for the efficient production of concentrated ethanol (equivalent flux: 2234 g/m 2 h; ethanol in permeate: 53 wt%) from dilute feed through two-times consecutive pervaporation at 40 °C. Moreover, the membrane with covalently enhanced interfaces exhibit stable performance during 100 h continuous operation.
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
危险品化学品经营许可证（带存储）