INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Wei Wang,Mehran Amiri,Tao Huang,Lev N. Zakharov,Yining Zhang,May Nyman
Isolating Fe(III) clusters from water without stabilizing ligands is significantly challenged by the high acidity of Fe3+-bound water, leading to uncontrolled precipitation of iron oxyhydroxides. Here we demonstrate a freeze-drying solvent-exchange method that enabled the isolation of a metastable Fe(III) sulfate decameric cluster formulated [Fe10O2(SO4)12(OCH3)2]·14CH3OH (Fe10). Without stabilization by solvent-exchange, the aqueous species undergoes rapid conversion to the iron sulfate mineral schwertmannite. Monitoring the hydrolysis process from cluster intermediates to schertmannite by small-angle X-ray scattering, we observe the progression from Fe10 to 37 Å soluble nanoparticles prior to the precipitation process. This condensation behavior of Fe10 is further exploited to develop a simple laboratory synthesis of schwetmannite. In addition, we demonstrate the versatility of the freeze-drying solvent-exchange method by isolating Al(III), Zn(II), and Cd(II) substituted Fe(III) sulfate clusters. The freeze-drying solvent-exchange method provides a unique opportunity to isolate cluster intermediates and models to aid in our understanding of metal-ion hydrolysis processes in environmental, material science, and geological studies.
研究领域:
环境科学
·
材料科学
·
地质学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haidi Wu,Yongchuan Wu,Jun Yan,Wei Xiao,Yuqing Wang,Hechuan Zhang,Xuewu Huang,Huaiguo Xue,Ling Wang,Longcheng Tang,Yiuwing Mai,Jiefeng Gao
Hydrogels have been rapidly developed recently owing to their excellent flexibility and biocompatibility and exhibit promising applications in biomaterials, flexible electronics, etc. However, when compared to the biological materials, many hydrogels with similarly high water contents display relatively low mechanical properties and it is difficult to achieve a balance between strength, toughness and fatigue resistance simultaneously. Herein, a facile solvent exchange assisted Hofmeister effect strategy is proposed to prepare strong and fatigue-resistant hydrogels with widely tunable water content. The polymer solution is first transformed to an organogel by exchange of the good solvent (dimethyl sulfoxide) to a poor solvent (alcohol), and then the organogel converts to hydrogel after the second step exchange of the alcohol to a saline solution. The alcohol induced gelation assisted salting-out promote the conformation adjustment of macromolecular chain, which endow the hydrogels with excellent comprehensive mechanical properties, with the extraordinary high strength of 26.4 ± 1.6 MPa, superior stretchability of 1252.3 ± 116 %, ultra-high fracture energy of 139.45 ± 37.3 KJ/m 2 , large fatigue threshold of 1837.9 ± 63.4 J/m 2 (water content of 20.2 wt%) as well as ionic conductivity of 0.34 S/m. Therefore, this work put forward a viable design method to fabricate outstanding performance soft materials for applications in load-bearing material and strain sensor fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Cheng Han,Lirong He,Qi Wang,Chuhong Zhang
Three-dimensional (3D) printing technologies possess incomparable advantages in fabricating 3D piezoelectric devices, enhancing the mechanical-to-electrical conversion efficiency. Among them, direct ink writing (DIW) holds great promise in constructing piezoelectric polymer devices as it enables self-polarization benefiting from the alignment of dipoles induced by the high pressure during the printing process. Besides, the electroactive phase of piezoelectric polymers is retained due to the operation is under ambient conditions. However, for the generally applied solvent-evaporation-assisted DIW technique, the architected structure suffers from drastic shrinkage and warpage in the final parts, which ultimately leads to a significant deviation from the programmed measure. In this work, for the first time, we develop a solvent-exchange-assisted DIW printing strategy to architect accurate and stable 3D PVDF PEH. This solvent exchange process in water not only enables the complete retaining of filament measure and generation of micropores to amplify the stain but also promotes the PVDF crystallization and formation of the β-phase. Moreover, trace vitamin B2 is formulated into the ink, affording self-polarized high β-phase content (95%) PVDF with good printability and optimal storage modulus to hold the 3D shapes. As a result, the 3D printed PVDF delivers an output voltage of 17.8 V, increased by 304% compared with device fabricated by solvent-evaporation-assisted DIW technique, and an impressive area output voltage density (11.04 V cm–2) which is twice that of the reported DIW printed PVDF PEH. This facile approach demonstrates a potential roadmap to high performance PEH through exploring complex 3D geometries enabled by the solvent-exchange-assisted 3D printing technique.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2018
·
IF 5.914
Xin Ning Zhang,Yan Jie Wang,Shengtong Sun,Lei Hou,Peiyi Wu,Zi Liang Wu,Qiang Zheng
Hydrogels are usually recognized as soft and weak materials, the poor mechanical properties of which greatly limit their applications as structural elements. Designing of hydrogels with high strength and high modulus has both fundamental and practical significances. Herein we report a series of tough, stiff, and transparent hydrogels facilely prepared by copolymerization of 1-vinylimidazole and methacrylic acid in dimethyl sulfoxide followed by solvent exchange to water. The equilibrated hydrogels with water content of 50–60 wt % possessed excellent mechanical properties, with tensile breaking stress, breaking strain, Young’s modulus, and tearing fracture energy of 1.3–5.4 MPa, 40–330%, 20–170 MPa, and 600–4500 J/m2, respectively. These tough hydrogels were also stable over a wide pH range (2 ≤ pH ≤ 10), resulting from the formation of dense and robust hydrogen bonds between imidazole and carboxylic acid groups. Moreover, the water content and mechanical properties of one gel can be adjusted over a wide range by controlling the dissociation and re-formation of hydrogen bonds during the solvent exchange and heating process; the treated hydrogel with specific characters was stable in water at room temperature. This is because the density of hydrogen bonds can be modulated at high temperature yet immediately fixed at room temperature due to the high stiffness and glassy state of the hydrogel. This strategy to prepare tough and stiff hydrogels should be applicable to other systems as structural materials with promising applications in diverse fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 6
·1483
·
IF 5.076
Xuesong Li,Pan Zeng,Qiongrong Ou,Shuyu Zhang
Metal halide perovskites have been successfully applied in a variety of fields such as LEDs, lasers and solar cells, thanks to their excellent optoelectronic properties. Capillary fibers can further expand the range of perovskite applications and at the same time improve its stability by encapsulating the perovskite inside the capillary. However, the high-quality perovskite film-coated hollow capillary fibers have yet to be realized. Here, we introduce a fast solvent exchange method which is used for the preparation of neat and smooth perovskite films deposited on the inner surface of capillary fibers. We demonstrate that this fast solvent exchange method is superior to the commonly used spontaneous diffusion-based precipitation method. The obtained hollow capillary fibers show a narrowed spectral width of 4.9 nm under pulse excitation due to the optical cavity effect. This new fabrication method can facilitate the development of perovskites in the fields of capillary lasing, microfluidic sensing, flexible LEDs and luminous fabrics.Keywords:perovskite film;capillary fiber;solvent exchange;amplified spontaneous emission
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2210624
·
IF 29.4
Yongchuan Wu,Ya Zhang,Haidi Wu,Jing Wen,Shu Zhang,Wenqian Xing,Hechuan Zhang,Huaiguo Xue,Jiefeng Gao,Yiuwing Mai
Hydrogels are widely used in tissue engineering, soft robots, wearable electronics, etc. However, it remains a great challenge to develop hydrogels possessing simultaneously high strength, large stretchability, great fracture energy, and good fatigue threshold to suit different applications. Herein, a novel solvent-exchange-assisted wet-annealing strategy is proposed to prepare high performance poly(vinyl alcohol) hydrogels by extensively tuning the macromolecular chain movement and optimizing the polymer network. The reinforcing and toughening mechanisms are found to be “macromolecule crystallization and entanglement”. These hydrogels have large tensile strengths up to 11.19 ± 0.27 MPa and extremely high fracture strains of 1879 ± 10%. In addition, the fracture energy and fatigue threshold can reach as high as 25.39 ± 6.64 kJ m −2 and ≈1233 J m −2 , respectively. These superb mechanical properties compare favorably to those of other tough hydrogels, organogels, and even natural tendons and synthetic rubbers. This work provides a new and effective method to fabricate superstrong, tough, stretchable, and anti-fatigue hydrogels with potential applications in artificial tendons and ligaments.
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
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Peng Chen,Yueshan He,Wei Wang,Haowen Sun,Yuan Liu,Qi Wang
Achieving a balance between flame retardancy, smoke suppression and mechanical properties of epoxy resin (EP) remains challenging in industry and academia. Herein, a novel polyphosphazene microsphere (PZS) was synthesised by precipitation polymerization. Further, BPF@PZS with core–shell structure was prepared by solvent exchange strategy for flame retardant EP. The precipitation polymerization confers PZS enriched with modifiable amino groups and natural P and N synergistic flame retardation. The solvent exchange provides BPF@PZS with good dispersion properties and char formation. The addition of only 5 wt% of BPF@PZS reduces the total heat release (THR) and total smoke production (TSP) during combustion by 40.6 % and 56.5 %, respectively, and results in a high LOI of 28.9%. Meanwhile, EP-BPF@PZS exhibits excellent mechanical properties due to the homogeneous spreading of BPF@PZS. This work broadens the application scenarios for the development of multifunctional and high-performance epoxy resins.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Feng Li,Weidong Gu,Shanshan Gong,Wenrui Zhou,Sheldon.Q. Shi,Qiang Gao,Zhen Fang,Jianzhang Li
Achieving strong and durable underwater adhesion in an easy way is highly demanded for practical applications. Despite extensive progresses, developing high-performance underwater adhesives by leveraging low-cost and sustainable biopolymer materials remains a hard task. Here, we report a simple one-pot strategy to construct a superior underwater adhesive through designing an amphiphilic function (established by thioctic acid and epoxy connector) in commercial biopolymer system. This amphiphilic-function-aiding biopolymer adhesive (AFBA), prepared in ethanol solution, can harness solvent exchange to trigger hydrophobic aggregation and phase transition in water, thereby yielding hydrophobic repulsion for effective dehydration, high structural stability for bulk cohesion strengthening, and versatile molecular interactions for interfacial adhesion enhancement. As such, AFBA exhibits a strong yet durable underwater adhesion (constantly increasing from 560 to 729 KPa to wood substrate after storing 30 days) and remarkable tolerance to various harsh environments (seawater, acidic, and alkaline solutions), allowing for underwater applying as a sealant to repair damage. Moreover, this simple strategy is generic that can derive a family of AFBAs with excellent underwater adhesion. This work may provide a promising pathway for engineering high-performance adhesives, and also open up a new direction to overcome the limitations of hydrophilic biopolymers in underwater application.
研究领域:
材料科学
·
生物化学
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Min Wu,Xiaoxia Chen,Jiatong Xu,Hongbin Zhang
Physical gels from natural polysaccharides present the advantage of no toxic cross-linking agents and no chemical modification during preparation. Herein, novel physical gels, transparent organogels and opaque hydrogels from the microorganism-derived (1,3)- β -D-glucan of curdlan were prepared in dimethyl sulfoxide (DMSO) using the freeze-thaw technique, followed by a solvent-exchange strategy with water. The mechanical and structural properties of these gels were investigated by rheology , scanning electron microscopy, attenuated total reflection infrared spectroscopy , wide-angle X-ray diffraction and small-angle X-ray scattering. Gelation mechanisms and intermolecular interaction models have also been proposed. The good solvent DMSO serves as both a crosslinker and a pore-foaming agent in organogels. The reversible macromolecular conformation changes and phase separation of curdlan endow the gels with reversible transparency, volume change and tunable mechanical strength. The new design strategy of facile preparation and performance tuning provides a platform for developing new organogels and sterile hydrogels of curdlan.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 7
·期 1
·2100852
·
IF 7.848
Qiantao Song,Yining Chen,Yanping Huang,Weihua Dan,Meng Wang,Nianhua Dan
Whether used for underwater adhesion or wound hemostasis, adhesives are required to have strong wet adhesion. However, traditional adhesives are difficult to break through the blockade of the hydration interface, so they cannot achieve strong underwater adhesion, and their biological toxicities are also greater, not suitable for wound hemostasis. In this work, small molecule polyethylene glycol diacrylate (PEGDA-200) and dopamine (DA) with good biocompatibility are used as raw materials to synthesize a long chain polymer (PDDA) with hydrophobic backbone and hydrophilic group through the Michael addition reaction. Based on the hydrogen bond interaction between PDDA and silicotungstic acid (SiW) and the solvent exchange between dimethyl sulfoxide and water, the two are successfully caused to agglomerate and form a viscous aggregate (PDDA-SiW). PDDA-SiW not only has strong underwater adhesion to various substrates, but also has strong adhesion and readhesion to fresh pigskins. In addition, PDDA-SiW also has very low hemolysis and cytotoxicity and strong antibacterial properties, and it is a very good underwater adhesion and wound hemostatic material.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Zi-Xuan Liang,Qing-Shuang Li,Zheng-Kun Zhao,Da Zhang,Xia-Chao Chen
Macroporous structures can be developed within polyelectrolyte multilayer films for efficient drug loading, but these structures tend to collapse or fracture during conventional drying procedures. Herein, a facile dehydrating method for macroporous polyelectrolyte multilayer films is proposed using solvent exchange to ethanol and then spontaneous evaporation. During these processes, the collapse of the macroporous structures can be effectively avoided, which can be ascribed to a combined effect of two factors. On one hand, capillary pressure during ethanol evaporation is relatively small since the surface tension of ethanol is much lower than that of water. On the other hand, solvent exchange suppresses the interdiffusion of polyelectrolytes and substantially increases the mechanical strength of the macroporous films, more than three orders of magnitude, making the pore walls highly tolerant of the capillary pressure. The stability of macroporous polyelectrolyte films to ethanol enables the repeated wicking from the ethanol solution of drugs, leading to a higher loading beyond previous studies. Such a high loading is favorable for the long-term release of drugs from the surfaces of modified substrates and maintaining a local drug concentration above the minimum effective concentration.
研究领域:
材料科学
·
生物医学工程
·
药物递送
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hao Zhang,Wenjun Cheng,Mingyang Yang,Benyan Xu,Ximei Xu,Ming Zhou
In recent years, liquid-free stretchable ionic conductors have emerged as a promising alternative to gel-based stretchable conductive materials owing to their excellent performance stability and ability to circumvent solvent-related defects. Nevertheless, the intrinsic compromise between stiffness and toughness in these materials restricts their utility as load-bearing materials. To overcome this challenge, we propose a solvent exchange-assisted polymerization strategy inspired by the structure–property relationships observed in biological tissues and develop a stiff yet tough liquid-free stretchable ionic conductor. This approach involves using solvent exchange to homogenize the polymer network and improve polymer crystallization. Additionally, the incorporation of flexible polymer chains through spontaneous solvent polymerization stabilizes the network. As a result, a rigid-soft polymer network characterized by high-density rigid crystalline domains embedded in a homogeneous soft matrix was engineered. This strategically designed architecture endows the material with relatively stable ionic conductivity (1.9 mS m −1 ) and unprecedented mechanical properties, including coordinatively enhanced stiffness (128.6 MPa) and toughness (134.7 MJ m −3 ), as well as remarkable mechanical strength (37.5 MPa) and resistance to tearing and crack propagation. Furthermore, this strategy can be directly applied to fabricate liquid-free ionic conductive fiber, which has great potential for use as wearable sensors and electronic tendons. This research not only reconciles the challenging trade-off between stiffness and toughness, but also offers a practical avenue for designing robust liquid-free stretchable ionic conductors, contributing to the advancements of soft electronics and engineering materials.
研究领域:
材料科学
·
软体电子学
·
生物仿生学
✓ 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）