ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hao Dong,Shefiu Kareem,Xiao Gong,Jian Ruan,Peng Gao,Xuedong Zhou,Xiaoqing Liu,Xiujian Zhao,Yi Xie
Lead halide perovskite (LHP) nanomaterials have attracted tremendous attention owing to their remarkable optoelectronic properties. However, they are extremely unstable under moist environments, high temperatures, and light illumination due to their intrinsic structural lability, which has been the critical unsolved problem for practical applications. To address this issue, we propose a facile and environmentally friendly ligand-free approach to design and synthesize rod-like CsPb2Br5-embedded Pb(OH)Br with excellent stability under various harsh environments such as soaking in water, heating, and ultraviolet (UV) illumination. Plate-like CsPbBr3- and Cs4PbBr6-embedded Pb(OH)Br powders are first formed by evaporating the solvent in a dispersion of ethanol (or methanol, isopropanol), Cs2CO3, and PbBr2. Upon soaking in water, the plate-like sample undergoes phase transformation from CsPbBr3 and Cs4PbBr6 to CsPb2Br5 and shape conversion from nanoplate to a microrod, leading to the formation of rod-like CsPb2Br5-embedded Pb(OH)Br. The stable Pb(OH)Br coating effectively prevents the luminescent CsPb2Br5 nanocrystals from reacting with water, leading to extremely high aqueous stability of the CsPb2Br5-embedded Pb(OH)Br. The photoluminescence (PL) intensity of the representative CsPb2Br5-embedded Pb(OH)Br sample can maintain 92.2% of the initial PL intensity value even after soaking in room-temperature water for 165 days; in the meantime, the phase and shape are preserved. The typical sample also shows outstanding stability under hot water, UV illumination, and annealing conditions. The ultrahigh aqueous stability, thermal stability, and photostability of the CsPb2Br5-embedded Pb(OH)Br nanomaterials suggest an effective, facile, and environmentally friendly technique to grow perovskite-based nanomaterials for promising practical applications in the optoelectronic field.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Food & Function
·
2020
·Vol. 11
·期 3
·2048-2057
·
IF 4.171
Shenglan Guo,Muwen Lv,Yunjiao Chen,Tao Hou,Yumeng Zhang,Zhaohuai Huang,Yong Cao,Michael Rogers,Yaqi Lan
A mixture of ceramide (CER) and lecithin (LEC) at specific ratios was capable of forming oleogels in sunflower oil triggered by adding a trace amount of water. It was noted that the addition of water at different temperatures (TW) resulted in different gelation behaviors and microstructures. To better illuminate the assembly mechanism at different TW, samples with water added at different TW (20 °C, 45 °C, 70 °C and 95 °C) were prepared. The viscoelastic properties, microstructures, and the crystal packing of these samples were investigated. It was observed that all samples prepared at TW of 20 °C and 95 °C formed gels, while most samples prepared at TW of 45 °C and 70 °C were too weak to form gels. Gels prepared at 95 °C were stronger but more fragile in texture compared to gels produced at 20 °C. The crystal morphology of gels drastically changed with TW. Spindle-shaped crystals were observed in gels prepared at low TW (20 °C), while gels prepared at high TW (95 °C) exhibited a network with packed oil droplets stabilized by lamellar shells together with fibrillar crystals in the bulk phase. X-ray diffractograms showed a different reflection peak (d-spacing of 14.5 Å) in gel prepared at 20 °C, compared to the d-spacing in oleogels with a single gelator (13.14 Å and 15.33 Å, respectively, for CER and LEC). Gel prepared at 95 °C showed two long-spacing characteristic peaks, which correspond to the characteristic peaks of CER gel (∼13 Å) and LEC gel (∼12 Å). Fourier transform infrared spectroscopy results indicated that the different gelation behaviors at different TW were mainly caused by vibrational changes in the amide bond of CER. Our hypothesized assembly mechanism can be concluded as: increasing TW resulted in the conversion of CER and LEC crystallization from co-assembly (TW = 20 °C) to self-sorting by individual gelators (TW = 95 °C). In this study, novel water-induced oleogels were produced by manipulating TW, and such information further assists the rational design of lipid-based healthy fat products.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2020
·Vol. 9
·期 1
·1-11
·
IF 13.714
Liu Kai-Kai,Liu Qian,Yang Dong-Wen,Liang Ya-Chuan,Sui Lai-Zhi,Wei Jian-Yong,Xue Guo-Wei,Zhao Wen-Bo,Wu Xue-Ying,Dong Lin,Shan Chong-Xin
Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr 3 )@PbBr(OH). We note that this strategy is universal to MAPbBr 3 , formamidine lead bromide perovskite (FAPbBr 3 ), inorganic lead bromide perovskite (CsPbBr 3 ), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m 2 when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Science
·
2023
·
IF 15.1
Min Li,Honglang Lu,Menghan Pi,Hui Zhou,Yufei Wang,Bin Yan,Wei Cui,Rong Ran
The development of hydrogel-based underwater electronics has gained significant attention due to their flexibility and portability compared to conventional rigid devices. However, common hydrogels face challenges such as swelling and poor underwater adhesion, limiting their practicality in water environments. Here, a water-induced phase separation strategy to fabricate hydrogels with enhanced anti-swelling properties and underwater adhesion is presented. By leveraging the contrasting affinity of different polymer chains to water, a phase-separated structure with rich hydrophobic and dilute hydrophilic polymer phases is achieved. This dual-phase structure, meticulously characterized from the macroscopic to the nanoscale, confers the hydrogel network with augmented retractive elastic forces and facilitates efficient water drainage at the gel-substrate interface. As a result, the hydrogel exhibits remarkable swelling resistance and long-lasting adhesion to diverse substrates. Additionally, the integration of carboxylic multiwalled carbon nanotubes into the hydrogel system preserves its anti-swelling and adhesion properties while imparting superior conductivity. The conductive phase-separated hydrogel exhibited great potential in diverse underwater applications, including sensing, communication, and energy harvesting. This study elucidates a facile strategy for designing anti-swelling underwater adhesives by leveraging the ambient solvent effect, which is expected to offer some insights for the development of next-generation adhesive soft materials tailored for aqueous environments.
研究领域:
材料科学
·
生物医学工程
·
软体电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Yongfang Sun,Huan Ma,Yueyue Jiao,Yunlei Chen,Xiaoze Yuan,Xiangyu Zhang,Fei Wang,Dongdong Xiao,Yi Wang,Dachao Hong,Yuwei Zhou,Lin Gu,Yong Yang,Yongwang Li,Xiao-Dong Wen
Ternary intermetallic electrides (LaTMSi) are a class of electride materials that show excellent catalytic performance in hydrogenation reactions due to their unique geometric and electronic structures. Compared with conventional electrides, such as C12A7: e–, LaTMSi show higher structural stability of bulk phase in air and water. However, their catalytic activities decrease gradually in reaction systems with H2O as the product. In the previous literatures, the deactivation behavior was attributed to the fact that H atoms enter into the LaTMSi lattice, occupy the electron sites, and lower the electron-donating ability. As a solution, the catalytic activities were supposed to be recovered by calcinating LaTMSi at high temperatures. Herein, under a H2O-containing atmosphere, TEM observations reveal that an amorphous shell with a thickness of ∼3 nm can form on the surface of the LaCu0.67Si1.33 phase even at room temperature. This amorphous layer is relatively stable at room temperature and can prevent the bulk phase from further structural evolution. However, the amorphous layer will undergo peeling off at a high temperature, thus resulting in a new catalytic active surface. Therefore, high-temperature calcination is an effective method to strip away the deactivated surface on LaTMSi which was caused by occasional exposures to H2O. However, for H2O-containing catalytic systems, frequently alternating reactions with H2O and calcination will lead to complete phase transition from LaTMSi to the corresponding oxides. Taking the LaCu0.67Si1.33 sample as an example, X-ray powder diffraction proves the formation of the CuO2 phase at 500 °C under a H2O atmosphere. Therefore, LaTMSi materials should not be applied as catalysts in H2O-containing systems. In addition, the facile H2O dissociation over the LaCu0.67Si1.33 phase is verified by using various experimental approaches (e.g., cyclic H218O pulse-TPD, high-temperature H218O pulse-TPSR, and IR) and theoretical calculations. Moreover, similar surface dissociation of H2O and phase transition are also observed over LaCoSi and LaNiSi ternary intermetallic electrides.
研究领域:
材料科学
·
催化化学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109850
·
IF 18.808
Xiaoqing Ming,Le Yao,He Zhu,Qi Zhang,Shiping Zhu
Responsive polymer materials possessing variable mechanical properties have shown promising practical applications, whereas water has clear advantages among the triggers owing to its wide abundance, green characteristics, as well as mild conditions involved. However, ubiquitous water-induced softening would prevent polymer materials from applications with high humidity or aqueous environment. Herein, an unprecedented polymer gel material is reported that exhibits a dramatic and reversible water-induced stiffening base on phase separation, differing from traditional ones that are usually weakened upon hydration due to the plasticizing effect. The material shows a large stiffness change in Young's modulus (as much as 10 4 times), which is much larger than that induced by glass transition and comparable to that caused by crystallization-melting process. The polymer materials are fabricated in a facile way by introducing an ionic liquid and a lithium salt into a poly(benzyl methacrylate) network. Moreover, the volume remains almost unchanged during the reversible soft–stiff transition. A universal approach of water-induced stiffening is proposed and verified on various systems. As for demonstration, this material is used for humidity-induced shape memory. This work offers an effective method for developing water-induced stiffened material and will pave the way toward potential applications for water-responsive polymer materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 45
·7444-7450
·
IF 4.776
Wu Wang,Hua Lai,Zhongjun Cheng,Hongjun Kang,Yongzhen Wang,Haiyang Zhang,Jingfeng Wang,Yuyan Liu
Water-induced shape memory polymers (SMPs) show promising applications in biomedicine, biosensing, anti-counterfeiting and intelligent actuating systems. However, the dual function of shape morphing and color switching has not been achieved in the water-induced SMP system. Herein, a novel water-induced SMP with both color-switching fluorescence behavior and shape memory performance is reported. The material is fabricated by crosslinking poly(vinyl alcohol) (PVA) and pH-responsive fluorescent carbon quantum dots (CQDs). The incorporation of CQDs with PVA not only improves the shape recovery performance but also endows the material with color-switching features. To our best knowledge, such smart ability is first realized in this PVA/CQD SMP system, and this report provides a novel strategy for fabricating smart water-induced SMPs with adjustable shape recovery performance and fluorescence.
研究领域:
材料科学
·
智能材料
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 15
·2300139
·
IF 15.1
Zhen Zhang,Zhenguang Wang,Xiao Liu,Yu-e Shi,Zhiqiang Li,Yanli Zhao
Inorganic boric acid (BA) is generally not considered an efficient afterglow material, and several groups have reported its extremely weak room-temperature phosphorescence (RTP) in the blue spectral region. It is discovered that heat treatment of BA results in increased afterglow intensity (27-fold increase) and prolonged emission lifetime (from 0.83 to 1.59 s), attributed to enhanced through-space conjugation (TSC) of BA. The afterglow intensity of BA can be increased further (≈415 folds) by introducing p-hydroxybenzoic acid (PHA), which contains a conjugated molecular motif, to further promote the TSC of the BA system. This combination results in the production of afterglow materials with a photoluminescence quantum yield of 83.8% and an emission lifetime of 2.01 s. In addition, a tunable multicolor afterglow in the 420–490 nm range is achieved owing to the enhancement of the RTP and thermally activated delayed fluorescence of PHA, where BA exerts a confinement effect on the guest molecules. Thus, this study demonstrates promising afterglow materials produced from extremely abundant and simple precursor materials for various applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Jingjing Cao,Xiankan Zeng,Shiyu Yang,Wen Li,Cheng Yan,Haichao Huang,Qungui Wang,Jun Lu,Weiqing Yang
A water-assisted strategy can improve the optoelectronic properties and stability of lead halide perovskites by regulating crystal growth and phase transition. However, studying the role of water in the nucleation growth kinetics of perovskite nanocrystals (PNCs) is still a significant challenge. Here, water-induced nucleation growth kinetics enhancement of CsPbBr 3 PNCs is revealed by multiple in situ cryogenic measurements. Water could lower the nucleation and growth barrier of PNCs to greatly increase their nucleation growth rate. Kinetically fast nucleation and growth processes result in the formation of large nanoplatelets for PNCs synthesized by adding a certain volume of water. PNCs synthesized with water added exhibit excellent photoluminescence performance in comparison to PNCs without water due to nucleation growth kinetics enhancement. This work provides a rich insight into the nucleation growth kinetics mechanism of PNCs, which paves the way for synthesizing high-quality PNCs and designing ligand engineering strategies.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jinhai Yang,Xixi Huang,Xieming Xu,Hao Lu,Shuaihua Wang,Shaofan Wu
Scintillation materials have been widely used in various fields, such as medical diagnosis and industrial detection. Chalcogenides have the potential to become a new generation of high-performance scintillation materials due to their high effective atomic number and good resistance to radiation damage. However, research on their application in radiation detection is currently very scarce. Herein, single crystals of rare earth ion-doped ternary chalcogenides NaGaS2/Eu were grown by a high-temperature solid-phase method. It exhibits unique characteristics of structure transformation by absorbing water molecules from the air. To maintain the anhydrous phase of the material, we have used a strategy of organic–inorganic composites of epoxy resin and NaGaS2/Eu to prepare devices for radiation detection and discuss the irradiation luminescence properties of the two phases. The anhydrous phase of NaGaS2/Eu demonstrates excellent sensitivity to X-rays, with a low detection limit of 250 nGy s–1, which is approximately 1/22 of the medical imaging dose. Additionally, composite flexible films were prepared, which exhibited excellent performance in X-ray imaging. These films enable clear observation of a wide range of objects with a high spatial resolution of up to 13.2 line pairs per millimeter (lp mm–1), indicating that chalcogenide holds promising prospects in the realm of X-ray imaging applications.
研究领域:
材料科学
·
医学影像
·
辐射检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 43
·8918-8930
·
IF 7.571
Ruibo Yang,Wenkai Liu,Ao Wang,Xiaobo Deng,Yuan Feng,Qiao Zhang,Zhen Li,Feng Luo,Jiehua Li,Hong Tan
Shape memory polymers (SMPs) with multiple functionalities have great potential in implantable biomedical devices, especially vascular stents. However, stents made of SMPs are generally faced with the problem of insufficient radial support due to the sharp decline of the modulus after shape recovery. Therefore, it is necessary to improve the modulus of SMPs after opening the narrow part by other means. In this study, the novel SMPs available for vascular stents were developed with impressive water-induced stiffening when shape recovered in a physiological environment. Herein, a series of shape memory polyurethanes (SMPUs) containing full hard segments on the main chains and bearing hydrophilic tertiary amine soft segments on the side chains were synthesized. When immersed in water, the soft segments were dramatically separated from the hard segments, which were aggregated more to form densely packed hard domains with stronger hydrogen bonding and higher crystallinity. Both Young's modulus and the shape recovery ratio were thus promoted due to the segmental rearrangement in water. At the same time, hydrophilic side chains migrated to the surface driven by the segmental rearrangement in water, which promotes the adhesion and growth of vascular endothelial cells and inhibits the activation of the coagulation system. The ingenious structural design provided SMPUs with adequate mechanical strength and hemocompatibility to qualify for potential applications in self-expanding vascular stents.
研究领域:
生物医学工程
·
材料科学
·
心血管医学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
·
2023
·
IF 3.6
Yunqiang Hu,Chengjun Zeng,Martine Ben Amar,Fei Jia,Yanju Liu,Jinsong Leng
The shape memory behavior of hydrogels endows themselves with the capacities of shape programming and shape recovering, which have great potential in many fields, such as drug release and soft robotics. In thermally responsive hydrogel , particularly, there are two critical factors, temperature and water, that can induce the shape memory effect(SME). Temperature-induced SME has been extensively studied, while water-induced SME has been rarely investigated. In our work, the combined effect of water and temperature on shape memory behavior of hydrogels is experimentally studied and deeply analyzed from a physical perspective. We found that the shape fixed ratio of shape memory hydrogels (SMHs) increases monotonically with temperature, but first increases and then decreases with water content. Moreover, it exits a nonlinear coupling between the water and temperature effects on the SME. On the basis of these findings, a constitutive model is developed to capture this thermo-aqueous coupling using the statistical theory of transient networks, from which we obtain an explicit evolution equation of deformation gradient . In the proposed theory, the temperature-induced SME is investigated through the temperature-water responsive association and dissociation of dynamic bonds while the water-induced SME is explained by the variation of the glass transition temperature according to the Fox–Flory model. Finally, and to provide a final test of the theoretical work, it is implemented into a user element (UEL) subroutine which provide simulations in agreement with our experiments. Our work is expected to provide guidance for future application of SMHs.
研究领域:
材料科学
·
生物医学工程
✓ 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）