NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 5
·1953-1958
·
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
RSC Advances
·
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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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xiao-Rui Wang,Wen-Jie Shi,Ai-Jun Jiao,Zhen-Hai Fu,Min-Peng Li,Hong-Yan Li,Cai-Xia Zheng,Yu-Xia Hu,Hong-Tao Xue,Mao-Cheng Liu
MXenes is considered as one of the most potential sodium ions storage materials due to its superior metallic conductivity, abundant surface functional groups, extensive specific surface area, and tunable interlayer spacing. Nevertheless, its practical application is hindered by severe volumetric expansion/shrinkage and slow sodium ions diffusion during sodium ions insertion/extraction process. Herein, a novel organic acid molecules bridging strategy is reported to stabilize layered structure and adjust the interlayer spacing of Ti 3 CN, which is realized by bridging organic acid molecules (named as TOAA) into Ti 3 CN interlayers (named as Ti 3 CN-TOAA) to form strong amido (HN C=O) bonds. The carbonyl groups of TOAA molecules can not only provide active sites for sodium ions storage, but also inhibit volumetric expansion/shrinkage by providing strain/pillar effects within the Ti 3 CN interlayers, achieving stable and rapid sodium ions storage. Consequently, the interlayer spacing of Ti 3 CN-TOAA (1.42 nm) is enlargered compared with that of Ti 3 CN (1.22 nm), while the sodium ions migration barrier of Ti 3 CN-TOAA is reduced by 0.09 eV Ti 3 CN-TOAA demonstrates superior cycling stability (the capacity retention remains at 83.2% after 2000 cycles at 0.5 A g -1 ) and rate capability (2.5 times the capacity of pristine Ti 3 CN at 5.0 A g -1 ). Significantly, the Ti 3 CN-TOAA||AC sodium ions capacitor (SIC) exhibits excellent cycling stability, retaining 79.3% of its capacity after 8000 cycles at 1.0 A g -1 . This work presents a novel approach to achieving stable and rapid sodium ions storage by stabilizing layered structure and adjusting interlayer spacing.
研究领域:
材料科学
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电化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·13997-14004
·
IF 3.288
Yangyi Sun,Yijing Mao,Ningyu Di,Xiaolong Chen,Dongming Qi,Baoqing Shentu
Herein, using an acid-hydrolyzed tetraethyl orthosilicate (TEOS)/bis(triethoxysilyl)ethane (BTEE) mixture as a precursor for the traditional surfactant-assembly synthesis of mesostructured silica spheres instead of directly purchased commercial precursors, molecularly ethane-bridged hollow mesoporous silica spheres (MEB-HMSs) with radial mesochannels and an enlarged pore size were successfully synthesized without any additional core templates. The composition, pore size, particle size, shell thickness, and rate could be controllably tailored by only changing the amount of reagents used in the reaction. The cytotoxicity assay confirmed that MEB-HMSs have good biocompatibility, together with good Dox-loading capacity.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Shixia Lan,Yongyun Mao,Bingpu Zhou,Wanbiao Hu
Conductive hydrogels, due to their adjustable flexibility and conductivity, present considerable advantages in tackling the bottleneck issues associated with electron transfer in wearable electronic devices. However, during the deformation process, achieving effective electron transfer between the hydrogel electrode and the adjacent frictional piezoresistive sensing layer, as well as effective transmission within the hydrogel electrode itself, remains a significant challenge. Herein, PEDOT molecular bridging is proposed to establish an efficient connection between hydrogel electrode and the adjacent layer. Polyacrylamide integrated with PEDOT interpenetrating network-based hydrogel (PPNM) is prepared as electrode through synergistic dual-crosslinking. A repetitive vacuum-assisted dip-coating technique is employed to modify TPU foam scaffolds with silver nanowire (AgNW) and PPNM, resulting in TPU@AgNW@PPNM foam (TAP) with a three-dimensional dual-conductive network as the adjacent frictional piezoresistive sensing layer. By tightly integrating TAP with PPNM, a mutual PEDOT-bridging between TAP and PPNM is established. Importantly, the interface remains intact and ensures stable electron transmission even under significant stretching and bending conditions. The piezoresistive sensor and triboelectric nanogenerator assembled based on TAP and PPNM exhibited an enhanced sensitivity of 27.8 kPa −1 and an output power density of 3.1 mW m −2 , respectively. This innovative solution effectively addresses the critical issue of electronic transfer between the electrode layer and the adjacent layer in wearable electronic devices, while also mitigating the problems related to the rigidity of electrodes that can impact the flexibility and comfort of wearable devices.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Boya Wang,Cheng Chen,Wei Yu,Jiujing Xu,Bisheng Li,Leihong Zhao,Liguo Shen,Hongjun Lin
Despite their considerable promise in water treatment, two-dimensional graphene oxide (GO) membranes are still hindered by inadequate structural stability due to weak interlayer interactions and structural defects, along with low permeability due to limited surface water inlets. Here, inspired by the leaf structure of Tillandsia, a stable and ultrapermeable GO-based membrane with Wenzel model hydrophilic surface and robust interior nanochannels was fabricated through interlayer molecular bridge and in-situ growth of covalent organic framework (COF, TP-TTTA) nanocrystals. The incorporation of amine monomer (4,4′,4″-(1,3, 5-triazine-2,4,6-triyl)trianiline, TTTA) molecular bridges for covalent crosslinking of GO nanosheets effectively stabilized the membrane framework. The obtained GO@TP-TTTA membrane resisted structural disassembly under prolonged acidic/alkaline immersion and high-pressure conditions. The in-situ growth of TP-TTTA COF led to a rough membrane surface with numerous selective and hydrophilic inlets. Thus, the water permeability of the obtained GO@TP-TTTA membrane could reach up to 246.9 L·m −2 ·h −1 ·bar −1 –2.6 times larger than that of pristine GO membrane–along with a retained 98.3 % rejection rate for bright blue G (BBG), successfully overcoming the common permeability-selectivity trade-off. Moreover, the resultant membrane demonstrated superior anti-fouling properties than the pure GO membrane. This molecular-scale structural design offers a novel approach for high-performance GO-based membranes, with promising applications in wastewater treatment.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
·
IF 6.3
Shennan Chen,Chu Zhang,Yongchun Ye,Chunying Ma,ChunLong Wang,Qingxue Wang,Yue Zhao,Mingjun Nie,Lei Shi,Yonggang Yu,Liguo Gao,Miaogen Chen,Yusran Sulaiman,Tingli Ma
The commercial self-assembled monolayer (SAMs) has been shown to significantly enhance the power conversion efficiency (PCE) of inverted (p-i-n) perovskite solar cells (PSCs) when employed as a double hole transport layer (HTL) on nickel oxide (NiO x ). Despite these improvements, the inherent hydrophobicity of the SAMs results in suboptimal crystallization and the formation of micro-scale voids at the buried interface of the perovskite layer, which in turn leads to significant interface defects and serious nonradiative recombination. In this work, we introduce a molecular bridging layer composed of Diethyl (Phthalimidomethyl) phosphonate (DP), characterized by its carbonyl groups and phosphoryl bonds, to be deposited onto the surface of Me-4PACz. This bridging layer demonstrates a remarkable ability to coordinate with lead ions, providing a robust binding affinity that facilitate excellent adhesion to the substrate surface. The synergistic interaction of the two functional groups within the DP layer effectively mitigates bulk-phase defects and suppresses nonradiative recombination at the buried interface of the perovskite. As a result, PSCs incorporating the DP layer achieved a champion PCE of 23.26 % on an active area of 0.09 cm 2 . Additionally, The unencapsulated PSC maintains above 50 % of its initial PCE in the air with a relative humidity (RH) of 50–60 % for 1000 h. This work highlights the potential of integrating bridging layers in optimizing the performance and stability of PSCs.
研究领域:
材料科学
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能源技术
·
光伏器件
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Yiqiang Deng,Shengwang Li,Zhuo Yang,Guining Chen,Xiuling Chen,Shuang-Feng Yin,Gongping Liu
The inherent nanochannels of mixed-matrix membranes (MMMs) have demonstrated significant potential in molecular sieving-based separations. However, achieving efficient helium (He) separation and purification remains challenging due to the inherent trade-off between selectivity and permeability. To overcome these limitations, rational design of polymer structures and MOF particle and preparation strategy for MMM is imperative. Herein, we proposed a strategy for constructing novel MOF-802/Mi@6FPZ MMMs for efficient He separation and purification. The design employed a tailored system composed of 6FPZ copolyimide (6FDA/mPDA:PABZ), MOF-802, and the small-molecule modulator 2-methylimidazole (Mi) to MMMs. The presence of hydrogen bonding between Mi and 6FPZ polymer, the formation of Zr–N coordination bonds between Mi and MOF-802 verified by ATR-IR spectroscopy, enabled the MOF-802 particles to be dispersed uniformly within the 6FPZ. Notably, the Zr–N bond formation liberated partial –COOH groups, creating additional nanochannels within the MOF-802/Mi@6FPZ to facilitate gas transport. PAL experiments indicated that the optimized MOF-802(20 %)/Mi(10 %)@6FPZ MMMs possess an average channel size of ≈0.40 nm, ideal for the selective separation of He from CH 4 or N 2 . This small molecule bridged MMMs achieved remarkable He/CH 4 and He/N 2 selectivity values of 429.8 and 174.2, respectively, coupled with a He permeability of 177 Barrer far surpassing the 2016 upper bound. This novel design strategy not only addresses critical challenges in He separation but also presents a versatile platform for developing defect-free, high-performance MMMs for a range of gas separation applications.
研究领域:
材料科学
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膜分离技术
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高分子化学
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气体分离
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纳米材料
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能源化工
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）