JOM
·
2016
·Vol. 69
·期 2
·254-260
·
IF 1.798
Li Hongliang,Song Shaoxian,Zhao Yunliang,Nahmad Yuri,Chen Tianxing
The effect of water and isopropanol intercalation on montmorillonite (MMT) delamination was investigated in order to compare the roles of hydration and solvation in the delamination. Transmittance results showed that water has a significant effect on the delamination of MMT compared with isopropanol. This observation was attributed to the difference of the intercalation of water and isopropanol. Thermogravimetric (TG) results illustrate that the intercalation mass of water was greater than that of isopropanol when the pressure remained constant. Weighing test results show that the intercalation mass of water was smaller than that of isopropanol when the volume of MMT remained constant. Molecule dynamic simulation results show that the water and isopropanol molecules were interacting with Na + and siloxane surface of MMT, respectively. It was demonstrated that the hydration of the MMT interlayer followed two steps: in step 1, the Na + in the interlayer was hydrated, thereby expanding the interlayer spacing; in step 2, additional water molecules were absorbed into the expanded interlayer space. It was found that step 2 could not be actuated until the completion of step 1. For the solvation of the MMT interlayer with isopropanol, however, only one step was required, in which isopropanol was absorbed onto the siloxane sites of the interlayer while maintaining the interlayer spacing.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Qian-Cheng Xia,Jue Wang,Xiao Wang,Bo-Zhi Chen,Jia-Lin Guo,Tian-Zhi Jia,Shi-Peng Sun
The present research investigates the solution to solve the delamination issue and control the morphology of dual-layer membranes fabricated from polymer/solvent binary systems without additives, post-treatment and other complicated processes. First, Extem®, Ultem®, polysulfone (PSf) and polyethersulfone (PES) were used to study the mechanism behind the adhesion/delamination phenomenon. It was found that adhesion of dual-layer membranes has nothing to do with the similar functional group of top and bottom polymers. Dual-layer membranes with excellent adhesion can be obtained by a newly proposed hydrophilicity control mechanism. More specifically, to obtain a delamination-free membrane, bottom layer should be more hydrophilic than top layer. If not, a significant difference in precipitation rate of the two layers or replacing the coagulant with a milder medium was requested. Then, the method was further extended to prepare multi-layer membranes. Finally, desirable morphology of each layer of dual-layer membranes can be obtained by properly adjusting the thickness and solvent types of top and bottom layers.
研究领域:
材料科学
·
膜技术
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Zehang Zhou,Lingfei Wei,Ya Yi,Shiyi Feng,Zeying Zhan,Dong Tian,Canhui Lu
MXene nanosheets are considered advantageous for functional materials, but current delamination methods to prepare MXene nanosheets have many limitations including high cost, small production scale, low efficiency, and deteriorated structure integrity of obtained nanosheets. Here, we propose a simple, efficient, and scalable shear stress-induced delamination (SSID) strategy to boost the production of single-/few-layered Ti 3 C 2 T x MXene nanosheets. Molecular dynamics simulation indicates that the pan mill-type grinding discs create a strong hydrodynamic flow field, which exerts gigantic shear stress to substantially delaminate the multilayered MXene stacks into homogeneously dispersed MXene nanosheets. Furthermore, shear stress generated from vigorous water flow has limited fragmentation effect, ensuring large lateral size and good structure integrity to the obtained MXene nanosheets as evidenced by the morphological and structural characterizations. Compared to conventional delamination methods, this novel SSID strategy exhibits great advantages in terms of efficiency, scalability and the properties of resultant MXene nanosheets, which opens up great opportunity for the scalable production and commercialization of high-performance MXene-based materials.
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
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Tengyu Long,Weizhong Yuan
The growing interest in biological skin mimicry has greatly contributed to the creation of high-performance artificial skin. Here, inspired by the optical-electrical signal co-transmission of chameleon skins, a bilayer biomimetic ion-conductive photoelectronic skin (BIPES) was constructed by compositing the mechanochromic nano-structured silica photonic crystal film with an adhesive, flexible hydrogel by a layer-by-layer design strategy. The BIPES has a highly sensitive strain response on electrical and optical signals (GF = 3.27 at 0–100 %, Δ λ /Δ ε = 2.1 nm % –1 ) and temperature response (TCR = –2.27 % °C –1 at 0–50 °C). Importantly, through the temperature insensitivity of the mechanochromic film, the BIPES not only achieved dual-signal motion detection but also achieved real-time temperature monitoring excluding strain interference. This research provides new inspiration for the construction of multi-signal combined photoelectronic skins and further exploration for advanced accurate smart wearable electronics in applications, especially in health detection for patients with non-spontaneous body-trembling.
研究领域:
材料科学
·
生物医学工程
·
智能可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Jianfeng Chen,Kai Peng,Yinong Yang,Yichuan Dai,Ben Huang,Xiaoxiao Chen
Despite improved sensitivity of iontronic pressure sensors with microstructures, structural compressibility and stability issues hinder achieving exceptional sensitivity across a wide pressure range. Herein, the interplay between ion concentration, mechanical properties, structural geometry, and aspect ratio (AR) on the sensitivity of lithium bis(trifluoromethanesulfonyl) imide/thermoplastic polyurethane (LiTFSI/TPU) ionogel is delved into. The results indicate that cones exhibit superior compressibility compared to pyramids and hemispheres, manifesting in an enhanced sensitivity toward the LiTFSI/TPU ionogel. Subsequently, by strategically combining cones with varying ARs, a harmonious balance between structural stability and compressibility is achieved, culminating in the fabrication of hierarchical iontronic flexible sensors (HIFS). Remarkably, HIFS-III with a three-level hierarchical conical microstructure demonstrates a preeminent sensitivity of 127.65 kPa–1 within ∼500 kPa. Even within the ultrabroad pressure range of 1500–3000 kPa, the sensitivity remains exceeding 10 kPa–1. Furthermore, HIFS-III boasts swift response and relaxation times (∼11 and 18 ms, respectively), a low detection limit (∼6.35 Pa), as well as remarkable durability (15,000 cycles). The exceptional sensing capabilities of HIFS-III underscore its emergence as a promising high-performance sensing and feedback solution tailored for applications in human–machine interaction and e-skin.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 20
·16711-16719
·
IF 3.289
M. Zirak,M. Ebrahimi,M. Zhao,O. Moradlou,M. Samadi,A. Bayat,H.-L. Zhang,A. Z. Moshfegh
A very simple and well-controlled procedure was employed to prepare CdS nanoparticle/few-layer MoS2 nanosheet/Indium tin oxide (ITO) thin film heterostructures. To tune and fabricate the CdS/MoS2(t)/ITO thin films with various surface topographies, first electrophoretic deposition (EPD) was used to deposit MoS2 nanosheets on the ITO substrate under an optimized applied potential difference (8 V) for different deposition times (t) of 30, 60, 120 and 240 s. Then, CdS nanoparticles were deposited via a successive ion layer adsorption and reaction (SILAR) technique. The highest photo-current density of 285 μA cm−2 was measured for the CdS/MoS2(60 s)/ITO sample, which was about 2.3 times higher than the value obtained for bare CdS/ITO. The photo-enhancement mechanism of the CdS/MoS2(t)/ITO heterostructures was described using a stochastic model. The results show that the CdS/MoS2(60 s)/ITO electrode exhibits the highest roughness exponent (2α = 0.67) with the smoothest nanometric fluctuations, resulting in the best wetting properties, and thus, the highest interaction between the electrolyte and the sample surface, leading to the highest PEC activity. On the other hand, the samples with small α possess rough and nanometric-jagged fluctuations. The air trapping inside these microscopic surface fluctuations reduces the wettability as well as surface interaction between the sample and the electrolyte, resulting in low photo-current density.
研究领域:
材料科学
·
电化学
·
纳米技术
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Xin Cheng,Mengyu Fu,Wangchao Chu,Shiqiang Chen,Guangzhou Liu
A nanostructured Fe 2 O 3 /CdZnS/ZnS composite film was constructed on EH40 steel using anodization, hydrothermal, and successive ionic layer absorption and reaction method. The film can inhibit the diffusion of dissolved oxygen to the substrate steel in aerobic seawater, and anodic dissolution of the substrate steel in D. vulgaris containing anaerobic seawater, respectively. The film can inactivate bacteria by producing active chlorine under light, which improves its anti-adhesion efficiency. The film prepared by 50 times of ZnS deposition reaches the highest anti-adhesion efficiency of 71.0 % and 63.3 % toward P. aeruginosa and D. vulgaris under dark, and 98.5 % and 96.0 % under light, respectively.
研究领域:
材料科学
·
腐蚀工程
·
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian Lu,Yingying Qin,Qi Zhang,Yilin Wu,Jiuyun Cui,Chunxiang Li,Liang Wang,Yongsheng Yan
High-selective multilayered Li + -imprinted membranes (Li-IIMs) with enhanced hydrophilicity and stability were developed based on polyether sulfone substrate membranes. The multilayered structure was prepared with polydopamine (pDA) as the interfacial adhesion layer, SiO 2 nanoparticles as the hydrophilic layer and Li + -imprinted polymers as the imprinted layer. The selective “Li + -recognition sites” were formed using 12-crown-4 (12C4) as the adsorbing units. The optimal relative selectivity coefficients (α) of Li + /Na + and Li + /K + reached up to 1.85 and 2.07 with the imprinting factor ( β ) of 2.51, and the high permselectivity factors ( γ ) of Na + /Li + (7.39) and K + /Li + (9.86) were achieved on Li-IIMs. The Langmuir isotherm model and the pseudo-second-order kinetics model best fitted the rebinding data of Li-IIMs, as well as the rebinding capacities reached up to 90.3% of initial binding after 5 cycles of adsorption/desorption and just declined to 88.1% after another 5 cycles a month later. Therefore, the as-prepared Li-IIMs would have potential applications for the separation of lithium ions from salt lake brines.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）