JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Caifang Ning,Hui Ma,Christian Marcus Pedersen,Hui Chang,Yingxiong Wang,Yan Qiao
Perfluorooctanoic acid (PFOA) is a persistent environmental contaminant with serious negative health effects, and removal of it from water is therefore highly relevant for environmental safety. In this paper, poly(amidoamine) (PAMAM) dendrimers have been proposed as hosts for the PFOA in order to remove it from aqueous solutions. The different aggregate structures for PAMAM-PFOA complexes with increase of −COO − /−NH 3 + molar ratios were proposed on the basis NMR titrations using 19 F NMR and further analyzed by the relaxation and diffusion measurements. It is suggested that PFOA micelles are transferred to the bilayer with increasing PAMAM concentration. Moreover, the protonated surface amine groups of PAMAM contribute to reduce the critical aggregation concentration (CAC) of PFOA. The study shows that the main driving force for interaction between PAMAM and PFOA is ionic interaction. This research will serve as a starting-point for removing the fluorinated contamination by using PAMAM dendrimers.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2025
·
IF 26
Lin Li,Qianwen Gao,Jie Miao,Nan He,Qian Zhang,Jun Zhang,Haonan Wang,Dawei Tang
The ability to continuously harvest energy from the human body has immense potential for powering wearable devices and biomedical systems, yet current thermoelectric hydrogels are constrained by rapid dehydration, limiting operational lifespans to less than 120 m and achieving temperature gradients of only ≈5 °C. Here, a self-cycling thermoelectric hydrogel is presented that addresses these challenges by autonomously regulating water-thermal cycling. This strategy achieves a maximum temperature gradient of 13 °C—more than 2.6 times the state-of-the-art—and maintains stable thermoelectric output for over 1500 min, the longest lifespan reported for such materials. Additionally, the hydrogel fully recovers hydration within 5 h, enabling robust reusability. Mechanistic studies reveal that optimized ionic interactions enhance thermal diffusion and elevate the Seebeck coefficient to 4.1 mV K −1 . This study introduces a scalable design for wearable thermoelectric materials, paving the way for advancements in health monitoring, environmental sensing, and wearable electronics.
研究领域:
材料科学
·
生物医学工程
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Yuqi Wang,Linxue Yan,Hua Li,Long Li,Yafei Guo,Tianlong Deng
Microcalorimeter measured the dilution enthalpies of the binary systems (LiBO 2 + H 2 O) and (LiB 5 O 8 + H 2 O) at 308.15 K and 0.1 MPa. Based on the Pitzer theory of electrolytes, their apparent molar enthalpies and the Pitzer single electrolyte parameters at 308.15 K were carried out by fitting the experimental data for the first time. Moreover, the calculated apparent molar enthalpies of LiBO 2 and LiB 5 O 8 aqueous solution according to the Pitzer ion-interaction model were consistent well with the experimental values, manifesting the high reliability of this study.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Yanliang Zhou,Xuanbei Peng,Tianhua Zhang,Hongfang Cai,Bingyu Lin,Lirong Zheng,Xiuyun Wang,Lilong Jiang
The metal–anion interaction (MAI) widely exists over supported metal catalysts, which has a significant effect on tuning metal sites and reaction performance. However, the effect of MAI on NH3 synthesis and the reaction mechanism is still elusive. Here, we report that the strength of Ru–anion interaction gradually increases from Ru–N to Ru–H and Ru–O when the anion of the support is changed from H (ZrH2) to N (ZrN) and O (ZrO2). Moreover, the Ru–anion interaction induced by different support compositions can affect the hydrogen spillover and N2 activation route. Due to the weak Ru–N interaction, the aggregation of Ru particles is observed over Ru/ZrN. Although Ru particles are highly dispersed over ZrO2 owing to the strong Ru–O interaction, hydrogen poisoning is inevitable over Ru/ZrO2. Comparatively, hydrogen poisoning can be alleviated over Ru/ZrH2 via hydrogen spillover to its support. The results of NEXAFS, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and isotope-labeling experiments show that N2 can be activated via both dissociative and associative routes over Ru/ZrH2. Consequently, the developed Ba-promoted Ru/ZrH2 catalyst displays a high NH3 synthesis rate of 27.5 mmol g–1 h–1 and robust stability during 300 h time-on-stream at 400 °C and 1 MPa.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2022
·Vol. 67
·期 4
·533-538
·
IF 1.667
Jiang Zhen-Zhen,Liu Gao-Ling,Li Ming-Li,Guo Ya-Fei,Meng Ling-Zong,Duo Ji,Deng Tian-Long
Abstract To better use rare earth element resources in geothermal water, it is essential to understand the volumetric property and the ion-interaction of the rare earth element aqueous solution systems. In this paper, the densities of aqueous Y 2 (SO 4 ) 3 from 0.00405 to 0.04071 mol kg −1 at 283.15 to 363.15 K were measured using an Anton Paar Digital vibrating-tube densimeter. Apparent molar volumes ( V ϕ ) and the coefficient of thermal expansion (α) were obtained based on the experimental density data, and the diagrams of the apparent molar volume and coefficient of thermal expansion of Y 2 (SO 4 ) 3 (aq) against temperature ( T ) and molality ( m ) in the binary system were revealed. The Pitzer single-salt parameters \({{(\beta }}_{{{\text{MX}}}}^{{(0)v}},{{\beta }}_{{{\text{MX}}}}^{{(1)v}},{{\beta }}_{{{\text{MX}}}}^{{(2)v}}\,\,{\text{and}}\,\,C_{{{\text{MX}}}}^{v})\) for Y 2 (SO 4 ) 3 and their temperature-dependent correlation F ( i , p , T ) = a 1 + a 2 ln( T /298.15) + a 3 ( T − 298.15) + a 4 /(620 − T ) + a 5 /( T − 227) (where T is temperature in Kelvin, a i are the correlation coefficients) for Y 2 (SO 4 ) 3 were obtained for the first time.
研究领域:
化学
·
物理化学
·
地质学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hao Jiang,Tong Yan,Wuting Pang,Meng Cheng,Zhihao Zhao,Tinglei He,Zhikun Wang,Chunling Li,Shuangqing Sun,Songqing Hu
Self-healing polymers with microphase separation structure typically require external stimuli to achieve self-healing, and their performance often degrades. To solve these issues, we introduce tertiary amine and carboxyl groups into polymer. The intermolecular ionic interactions and H-bonds contribute to the formation of microphase separation structures, endowing polyurethane elastomers (PU-n) outstanding mechanical properties with a maximum tensile strength and toughness of 20.61 MPa and 59.02 MJ/m 3 , respectively. The self-healing of the prepared PU-n can be achieved at room temperature and accelerated significantly by water because hard phases can be dissociated, resulting in enhanced molecular movement. After self-healing with water, the enhanced molecular movement and further ionization of ionic groups lead to stronger H-bonds and ionic interactions, promoting more distinct microphase separation. Thus, the mechanical strength is strengthened and the self-healing efficiency can reach 104.72 %. The enhanced molecular movement and strengthened intermolecular interactions when self-healing with water can also be verified through in-depth analysis of molecular dynamics (MD) simulations of the self-healing process. Furthermore, PU-n display remarkable shape memory and can be recycled through exposure to solvents and hot water. This study provides a novel and general method for preparing materials that can self-heal with water and self-strengthen after self-healing.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Renjie Ding,Jinhua Xiong,Qian Yan,Pengyang Li,Xu Zhao,Zhong Chen,Zonglin Liu,Huanxin Lian,Zhigong Tang,Shanyi Du,Qingyu Peng,Xiaodong He
Solar-driven water purification has become a promising way to overcome the freshwater crisis because of its environmentally-friendly features. Improving the evaporation rate and evaporation efficiency are eternal topics. In this work, we redesign the solar-driven vapor generation (SVG) device and a unique in-plane temperature gradient is established due to the oriented water transportation. The input energy is maximized and the superb evaporation rate of 6.40 kg m −2 h −1 with an efficiency of 243.8 % is achieved. By investigating the hydration state in NaCl solution and aqueous acid, the interaction mechanism between hydrated ions and non-woven fabrics is developed. Owing to the increased intermediate water proportion, the evaporation rate of the SVG device in 5 wt% NaCl solution can reach 6.38 kg m −2 h −1 , which is almost the same as that in DI water. Moreover, the unique reversible doping properties make the non-woven fabrics a reusable and stable volatile acid purifier. The evaporation rate in pH = 4.0 aqueous acid can be enhanced to 6.75 kg m −2 h −1 , while the generated water maintains a pH higher than 6.5. Our work provides a new perspective for designing high-efficiency and multifunctional SVG devices.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 47
·17042-17049
·
IF 7.393
Chunhui Luo,Xinyue Deng,Shuai Xie
Designing skin-comparable conductive hydrogels has attracted tremendous interest, while it remains challenging to simultaneously achieve super-extensibility and ultra-sensitivity. Herein, a novel hydrogel was successfully fabricated to tackle this problem by using acrylamide (AM), flowerlike micelles (polyethylene glycol dilaurate) and sodium chloride (NaCl) as the monomer, cross-linker and conductive filler, respectively. The synergy of micelle deformation under external loads and chain entanglement between polyethylene glycol and polyacrylamide chains endowed the gel with an ultra-stretchable property (elongation at break of 155 mm mm−1). Meanwhile, the dipole–dipole interactions between ions and polymeric chains led to an ultra-sensitive capacity (gauge factor = 54.5, tensile strain > 20 mm mm−1), superior to those of most hydrogel-based sensors. Therefore, the obtained sensor could precisely monitor various human motions, including finger bending at different angles, speaking, walking and running. Additionally, the presence of ions (Na+ and Cl−) endowed the gel with excellent anti-freezing properties (128 mm mm−1 tensile strain at −20 °C). This work sheds light on the fabrication of high-performance sensors and will broaden their applications.
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
ADVANCED MATERIALS
·
2024
·
IF 27.4
Fangzheng Liu,Jiayi Wang,Wenyan Chen,Mingman Yuan,Qingrong Wang,Ruohong Ke,Guangzhao Zhang,Jian Chang,Chaoyang Wang,Yonghong Deng,Jun Wang,Minhua Shao
Lithium-ion batteries using quasi-solid gel electrolytes (QSEs) have gained increasing interest due to their enhanced safety features. However, their commercial viability is hindered by low ionic conductivity and poor solid–solid contact interfaces. In this study, a QSE synthesized by in situ polymerizing methyl methacrylate (MMA) in 1,2–dimethoxyethane (DME)-based electrolyte is introduced, which exhibits remarkable performance in high-loading graphite||LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) pouch cells. Owing to the unique solvent-lacking solvation structure, the graphite exfoliation caused by the well-known solvent co-intercalation is prohibited, and this unprecedented phenomenon is found to be universal for other graphite-unfriendly solvents. The high ionic conductivity and great interfacial contact provided by DME enable the quasi-solid graphite||NCM811 pouch cell to demonstrate superior C-rate capability even at a high cathode mass loading (17.5 mg cm -2 ), surpassing liquid carbonate electrolyte cells. Meanwhile, the optimized QSE based on carbonates exhibits excellent cycle life (92.4% capacity retention after 1700 cycles at 0.5C/0.5C) and reliable safety under harsh conditions. It also outperforms liquid electrolytes in other high-energy-density batteries with larger volume change. These findings elucidate the polymer's pivotal role in QSEs, offering new insights for advancing quasi-solid-state battery commercialization.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Tong Shi,Zhiyu Xiong,Wengang Jin,Li Yuan,Quancai Sun,Yuhao Zhang,Xiuting Li,Ruichang Gao
The suppression mechanism of l -arginine (Arg) in fish myosin heat-induced aggregation was investigated in this work. The hydrodynamic radius determined by dynamic light scattering (DLS) and the turbidity of a myosin solution decreased in a dose-dependently manner with Arg after heating, especially in a solution without pH modification ( P < 0.05). The surface hydrophobicity of myosin exhibited the same trend as that for hydrodynamic radius and turbidity ( P < 0.05). The myosin secondary structures clearly changed with Arg concentration during heating ( P < 0.05). These results demonstrate that positively-charged Arg could form ionic interactions with negatively charged myosin, as well as promote repulsion between myosin molecules induced by higher pH values. Furthermore, the resultant hydrogen bonding observed indicated that, in addition to Arg having ionic linkage effects, the specific structure of Arg played an important role in the suppression of myosin aggregation. Essentially, Arg markedly disturbed the hydrogen bonds of the myosin backbone and formed new hydrogen bonds with myosin molecules via two amino groups (-NH 2 ), which are part of the guanidinium moiety of Arg, preferentially hydrogen bonding with the backbone carbonyl oxygen atoms of myosin molecules. This work provides support for using Arg as an additive to modify the texture of fish products to produce liquid and semiliquid food suitable for the elderly consumers in an aging society.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Light-Science & Applications
·
2014
·Vol. 3
·期 8
·e193
·
IF 8.476
Qin Wei-Ping,Liu Zhen-Yu,Sin Chol-Nam,Wu Chang-Feng,Qin Guan-Shi,Chen Zhe,Zheng Ke-Zhi
Cooperative luminescence (CL) occurs in spectral regions in which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL of three Yb 3+ ions was observed in the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV CL intensity showed a cubic dependence on the NIR pump power, whereas the luminescence lifetime was nearly one-third the luminescence lifetime of single Yb 3+ ions. The triplet CL (TCL) has a clear spectral structure, in which most emission peaks are consistent with the self-convoluted spectra from single Yb 3+ ions. Blue shifts were observed for certain peaks, indicating complex interactions among the excited Yb 3+ ions. The probability of the TCL process versus the average distances among three Yb 3+ ions was derived via the first- and second-order corrections to the wave functions of lanthanide ions, indicating that the formation of Yb 3+ clusters containing closely spaced ions favors the occurrence of the multi-ion interaction processes. Furthermore, the cooperative sensitization of one Gd 3+ ion by four excited Yb 3+ ions (Yb 3+ -tetramer) was demonstrated experimentally, which exhibited a novel upconversion mechanism—cluster sensitization. Our results are intriguing for further exploring quantum transitions that simultaneously involve multiple ions.
研究领域:
光学材料
·
稀土发光
·
量子光学
·
纳米光子学
·
固体发光
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Mohammad Javadi,Sina Naficy,Stephen Beirne,Sepidar Sayyar,Rouhollah Jalili,Simon E. Moulton
Considerable improvements have been obtained in physical and mechanical properties of free standing liquid crystal graphene oxide (LCGO) films in their hydrated state, by modification of LCGO dispersions with a low quantity of chloride salts. Addition of salts to LCGO dispersions result in an increase of the storage and loss moduli and viscosity through the interaction between cations and functional groups of LCGO, with the magnitude of increase being dependent upon the concentration of the salt added. A viscosity increase of between 30× and 300× (depending on the salt type) is recorded when salt is added at a concentration as low as 80 mM while storage and loss moduli increase up to 23× and 29×, respectively. Free standing films made from the salt treated LCGO dispersions contained up to 26% water in their structure and were observed to have significantly improved mechanical (2× to 5× increase) and electrical properties (decreased surface resistance up to approximately 670×) compared to free standing films prepared without chloride salts. The influence of the salts on properties of LCGO dispersions and their hydrated free standing films is postulated as a complex interplay of many factors such as the size of cations, the valency of positive charge of the cations, ratio of charge and cations size, as well as the hygroscopic nature of the salts.
研究领域:
材料科学
·
物理化学
✓ 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）