JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 24
·13590-13603
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IF 4.22
Lin Feng,Meng Xiangyan,Tang Ke,Wu Lishun,Yuan Ruting,Liao Lijun
The design of the hierarchical structure and geometry of nanomaterials at the molecular and macroscopic level are crucial to determine their properties and applications. In this work, we describe a facile and effective method to control over the mesostructure and morphology of ethane-bridged PMOs with the assistance of various organic salts under basic conditions. It is demonstrated that the specific interaction between the surfactant and organic salts is responsible for the shape of surfactant micelles and the formation of ethane-bridged PMOs. Specifically, the structure and the hydrophobicity of the organic salts play a major role. The addition of organic salts with more hydrophobic organic moieties, such as sodium salicylate, sodium succinate and sodium benzoate, will increase the surfactant packing parameter more effectively, leading to the mesophase change from cubic Pm3n to 2-D hexagonal P6mm structure, whereas the addition of organic salts with lower hydrophobicity and larger polar head, like sodium oxalate, will result in the mesophase transformation from cubic Pm3n to 3-D hexagonal P6 3 /mmc structure. Moreover, the addition of organic salts will not only affect the micellar formation, but also influence the charge matching at the surfactant/silicate interface as well as the condensation and aggregation kinetics of silica species. The addition of large amount of any organic salts will eventually lead to the formation of PMOs with disordered mesoporous structure. Graphical abstract
研究领域:
材料化学
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纳米科技
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DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Xue-Li Cao,Tian Tian,Yong Bai,Chun Cui,Cong Luo,Jiang-Shan Xing,Chuan-Yu Chen,Lili Zhao,Shi-Peng Sun
Traditional nanofiltration membranes often struggle to maintain stability in harsh environments due to issues like swelling, chemical bond dissociation, and polymer chain creep. Fluoropolymers like poly(ethylene-chlorotrifluoroethylene) (ECTFE) are promising substrate candidates for broad-spectrum corrosion-resistant nanofiltration (CRNF) membranes, but their solvent insolubility and hydrophobicity present significant processing challenges. This study harnesses the electrospinnability and abundant reactive sites of polyvinyl alcohol to create a reactive site-bridged nanofibrous network. This network provides reactive sites to decorate the hydrophobic ECTFE substrate and bridges the molecular selective layer through aldolization, Schiff base reactions, and esterification. The resulting robust thin-film nanofibrous composite membranes exhibit high rejection rates for small molecular dyes under a variety of harsh conditions, including exposure to 10 wt% H 2 SO 4 , 1 M NaOH, ethanol, N , N -dimethylformamide, N -methylpyrrolidone, and 80°C solutions. This work paves the way for designing next-generation broad-spectrum CRNF membranes, enhancing their applicability in diverse harsh environments.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 5
·1953-1958
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IF 3.269
Yulu Zhang,Jin Wang,Yong Wei,Xuetong Zhang
Molecular bridged silica aerogels have received extensive interest in recent years due to their easily controlled mechanical properties varying with different organosilane precursors, and without any further post-modification. In this work, a series of novel and robust molecular bridged silica aerogels were prepared by using a symmetrical urethane-bridged monomer, named N,N-bis(propyltriethoxysilyl)carbamide (bPTSCA), which was synthesized via a solvent-free exothermic reaction between 3-isocyanatopropyltriethoxysilane (IPTES) and 3-aminopropyltriethoxysilane (APTES) for several minutes at normal temperature and pressure. The influence of catalysts on the obtained gels and aerogels was studied in detail. It was found that NH4F aqueous solution showed the most effective catalysis capability, and the corresponding aerogels were intact with slight shrinkages. The mechanical strength of these aerogels could reach as high as 100 times more than that of the native silica aerogels (unbridged), and the strength could be easily adjusted from a rigid region to an elastic region simply by varying the sample density. Moreover, these aerogels possessed an interesting character of regional shrinking when encountering with water, which made it possible to fabricate artistic aerosculptures with water or other polar solvents as a graver.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
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IF 17.694
Wan Sijie,Li Xiang,Chen Ying,Liu Nana,Wang Shijun,Du Yi,Xu Zhiping,Deng Xuliang,Dou Shixue,Jiang Lei,Cheng Qunfeng
Titanium carbide MXene combines high mechanical and electrical properties and low infrared emissivity, making it of interest for flexible electromagnetic interference (EMI) shielding and thermal camouflage film materials. Conventional wisdom holds that large MXene is the preferable building block to assemble high-performance films. However, the voids in the films comprising large MXene degrade their properties. Although traditional crosslinking strategies can diminish the voids, the electron transport between MXene flakes is usually disrupted by the insulating polymer bonding agents, reducing the electrical conductivity. Here we demonstrate a sequential densification strategy to synergistically remove the voids between MXene flakes while strengthening the interlayer electron transport. Small MXene flakes were first intercalated to fill the voids between multilayer large flakes, followed by interfacial bridging of calcium ions and borate ions to eliminate the remaining voids, including those between monolayer flakes. The obtained MXene films are compact and exhibit high tensile strength (739 MPa), Young’s modulus (72.4 GPa), electrical conductivity (10,336 S cm −1 ), and EMI shielding capacity (71,801 dB cm 2 g −1 ), as well as excellent oxidation resistance and thermal camouflage performance. The presented strategy provides an avenue for the high-performance assembly of other two-dimensional flakes.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2022
·
IF 9.231
Feiyang Li,Yaqiong Zhang,Xiaomin Tang,Peize Song,Lijing Su,Junfeng Fan
This study aimed to improve the emulsifying properties of microcrystalline cellulose by carboxylating (CC) and bridging to hydrophobic oat globule peptides (HP) via Ca 2+ (CC-Ca-HP). FTIR and XRD spectra analysis proved the successful attachment of HP to CC through a salt bridge. The Ca 2+ -bridging significantly changed the particle characteristics of CC-Ca-HP, including particle size, ζ-potential, and wettability. The Ca 2+ -bridged composite CC-Ca-HP demonstrated remarkable emulsifying stability compared with the nonbridged blend (CC–HP). Further analysis of the steady flow characteristics and dynamic viscoelastic properties revealed a network structure formed in the CC-Ca-HP emulsion. Moreover, the CC-Ca-HP emulsion showed a marked release of free fatty acids, increased bioaccessibility of zeaxanthin in the simulated gastrointestinal digestion, and less oil oxidation under the accelerated oxidation condition, indicating that the stable structure of CC-Ca-HP imparted by Ca 2+ -bridging prevented the aggregation of oil droplets as collision occurred under the harsh gastric conditions.
研究领域:
食品科学
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材料科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2015
·Vol. 5
·期 111
·91407-91413
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IF 3.84
Yong Wei,Jin Wang,Yulu Zhang,Lin Wang,Xuetong Zhang
In this study, molecular-bridged silica aerogels (MBSAs) were synthesized via supercritical CO2 liquid drying of bridged 3-aminopropyltriethoxysilane (APTES) wet gels, which were autocatalytic gelled by the catalyst-free bridging of APTES and 1,4-phthalaldehyde via a Schiff base condensation. The detailed mechanism of this facile, one-pot and autocatalytic approach for the production of MBSAs was revealed by in situ1H NMR and FTIR measurements, and the critical conditions for the successful autocatalytic gelation of the bridged-APTES were investigated. The densities and average pore diameters were in the range from 0.0535 to 0.0702 g cm−3 and from 12.9 to 14.1 nm, respectively. Moreover, the morphologies and thermal stability of the products were characterized by SEM and TGA, respectively. Interestingly, the MBSAs show excellent absorption performance for organic solvents, e.g., hexane, dichloromethane, kerosene, dimethylsulfoxide, tetrahydrofuran, ethanol, ethylsilicate, and N,N-dimethylformamide. Among those, 2437% by mass absorption of dichloromethane was achieved. Moreover, the absorption property of the aerogel was stable, with nearly no deterioration even after 30 absorption–desorption cycles. In addition, the aerogel showed remarkable flexibility, with the highest deformation of 90% and complete recovery after the release of stress, and it can be under through 30 cycles of compression–reversion process with 40% deformation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Runren Jiang,Guanghua Lu,Tianjian Dang,Min Wang,Jianchao Liu,Zhenhua Yan,Haijiao Xie
The use of photocatalysis to remove pharmaceuticals and personal care products (PPCPs) is emerging as a promising method, but few studies have investigated the simultaneous degradation of multiple PPCPs. Here, we constructed a hydrogen-bonded bridged MIL-101(Cr)–NH 2 /BiOCl-OH (MCN/BOCH) system to degrade sulfamethoxazole and ethyl p-aminobenzoate alone or in combination. The MCN/BOCH system effectively removed two PPCPs under visible light and exerted a synergistic effect on degrading the combined pollutants. Meanwhile, the degradation products of the mixture changed significantly compared with that of a single pollutant, and the toxicity of the composite pollutants was significantly reduced through the combined effect of synergistic degradation. The bridging of hydrogen bonds effectively accelerated charge transfer at the heterojunction interface under visible light. Moreover, the separated redox side of the MCN/BOCH heterojunction system and the electron donor and acceptor effect of the two PPCPs significantly enhanced the synergistic photocatalytic degradation performance. This work might be useful for controllable designs of hydrogen-bonded photocatalysts for the treatment of complex PPCP pollution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 9
·3696-3705
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IF 8.1
Wang Yang,Gao Feng,Zhou Shuai,Hu Po,Fu Jiajun
Lanthanide-doped upconversion nanoparticles (UCNPs) have been extensively investigated owing to their unique advantages. So far, the most favored modality of UCNPs is still the classical Yb–A (where A refers to Er 3+ , Tm 3+ , and Ho 3+ )-coupled nanosystems under 980-nm excitation. However, the frequently used Yb 3+ ion with the single-excited 2 F 5/2 state can barely transfer energy to other acceptors owing to its lack of matched excited levels. Herein, a novel strategy is proposed for energy transfer via Ho 3+ as a bridge ion coupling donor-acceptor pairs (e.g., Yb 3+ –Nd 3+ ), where little direct energy transfer occurs, and the involved energy transport mechanisms are investigated. The findings reveal that long-distance energy transportation can occur in the Ho 3+ sublattice owing to the energy migration capability of Ho 3+ and that Ho 3+ as a bridge ion can realize interparticle energy transfer for upconversion luminescence. Moreover, well-designed NaYbF 4 :40%Ho@NaYF 4 :10%Nd core-shell nanoparticles with multimode responsiveness can emit different colored lights under varying excitation wavelengths, which are demonstrated in high-level anticounterfeiting and information identification. Therefore, this work paves a new way to understand the functionality of the Ho 3+ bridge in energy transfer upconversion and offers strategies for broadening energy transfer pathways and finely manipulating photon upconversion.
研究领域:
材料科学
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光学
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纳米技术
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产品关联
DOI
高影响因子
Nano Energy
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2025
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IF 17.1
Lixin Bai,Juan Chen,Yi Zhang,Zheng Yi,Yuansen Xie,Maowen Xu,Yuruo Qi
The intrinsic sodium storage performance of hard carbons is fundamentally governed by its structure attributes, which are primarily shaped by the precursor material. Therefore, a direct manipulation of precursors at the molecular level offers considerable flexibility in engineering hard carbon architectures. This study introduces a straightforward and effective pre-carbonization approach to modulate the molecular configuration and functional groups within celluloses, employing both oxygen-bridging and air-etching to stimulate the development of closed pores during carbonization. These closed pores not only facilitate the transport of sodium ions but also serve as active sites for sodium storage, resulting in a hard carbon with an impressive specific capacity of 421.1 mA h g −1 and a substantial low-voltage plateau capacity of 312.8 mA h g −1 . Extensive research has elucidated the formation mechanism of closed pores as well as its correlation with low-voltage plateau capacity, which will greatly forward the rational design of high-performance hard carbon anodes for next-generation sodium ion batteries.
研究领域:
材料科学
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电化学
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储能技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Guozhen Li,Shiqi Ling,Yuhui Cui,Shilong Dong,Tianyin Liu,Ting Li,Siyu Pang,Peiyong Qin
Zeolitic imidazolate framework-8 (ZIF-8) is a typical filler used to fabricate mixed matrix membranes (MMMs) on account of its attractive advantage of high selective permeability for gas separation. However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, which will lead to a decrease of selectivity and the performance of gas separation will be strongly influenced. Herein, we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH 2 , Kapton polyamide acid was selected as the polymer matrix. Results showed that the ZIF-8-NH 2 /Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging, even the filler loading up to 45% (mass). The 45% (mass) of ZIF-8-NH 2 /Kapton membrane showed 297 barrer (1 barrer = 10 −10 cm 3 ·cm·cm −2 ·s –1 ·cmHg –1 , 1 cmHg = 1333.22 Pa, standard temperature and pressure) of the permeability of H 2 and 43.9 and 62.2 of selectivities for H 2 /N 2 and for H 2 /CH 4 , respectively, which are beyond the upper limit of Robeson 2008.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2019
·
IF 3.074
Ting Lü,Chenglin Luo,Dongming Qi,Dong Zhang,Hongting Zhao
A series of chitosan-based flocculants have been successfully synthesized by grafting poly(acrylamide) (PAM) or poly(dimethyl acryloyloxyethyl benzyl ammonium chloride) (PDBC) onto chitosan (CS) molecular chain and then characterized by using multiple techniques. The synthesized CS-based flocculants were subsequently used to flocculate the emulsified oil droplets in simulated oily wastewater under various conditions. It was found that the PDBC-grafted CS (CS-g-PDBC) showed better flocculation performance than those of CS and two other commonly used flocculants, i.e. cationic PAM (CPAM) and polyaluminum chloride (PAC). Moreover, the flocculation efficiency of CS-g-PDBC was gradually enhanced with increasing grafting ratio of PDBC, while declined after the introduction of grafted PAM chains. The cationic and hydrophobic groups of PDBC could significantly promote the adsorption of flocculant molecular chains on the negatively charged oil droplets via electrostatic attraction and hydrophobic interaction, thereby facilitating subsequent flocculation process. In addition to the adsorption bridging mechanism, zeta potentials measurements indicated that patching was the dominant mechanism under acidic and neutral conditions, while charge neutralization was the main mechanism under alkaline condition. On this basis, the chosen flocculant CS-g-PDBC was employed to treat the actual oily wastewater. Results showed that the removal ratio of both turbidity and oil exceeded 98%, suggesting that this newly synthesized CS-g-PDBC would be a promising flocculant for emulsified oily wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Huiliang Li,Fengping Li,Zeyan Wang,Yachen Jiao,Yuanyuan Liu,Peng Wang,Xiaoyang Zhang,Xiaoyan Qin,Ying Dai,Baibiao Huang
Carbon bridged graphitic carbon nitride (g-C 3 N 4 ) was prepared by a facile supramolecular self-assembly method. Experimental results and theoretical calculations indicate C atoms were introduced into the g-C 3 N 4 lattice by substituting the bridged N atoms. As a result, the delocalized big π bonds can be formed among the adjacent heptazine rings, which could both enhance the light absorption and promote the charge separation. Beneficial from the efficient charge separation and enhanced light absorption, the carbon bridged g-C 3 N 4 exhibits high efficient photocatalytic activity, where the H 2 evolution rate is about 7 times as high as that of pristine g-C 3 N 4 . This work demonstrates carbon bridged C 3 N 4 can be fabricated by a simple supramolecular self-assembly process, which could be useful for the further development of high efficient g-C 3 N 4 photocatalysts.
研究领域:
材料科学
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光化学
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纳米技术
✓ 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）