Materials Today Physics
·
2020
·
IF 10.443
X.N. Zhang,C. Du,M. Du,Q. Zheng,Z.L. Wu
Revealing the structure formation kinetics is a long-term challenging issue in the development of tough hydrogels, although they are significant for understanding structure-property relationship and toughening mechanism. Here, we report a series of tough and stiff poly(methacrylamide- co -methacrylic acid) hydrogels, with a focus on the structure-property relationship and structure formation kinetics. These hydrogels in a glassy state possess moderate water content and excellent mechanical properties with Young's modulus up to 200 MPa. The microstructure of the gels changes from uniform to bicontinuous and then to colloidal network as the fraction of methacrylamide, f am , increases, accounting for the ductile-brittle transition of the mechanical performances. Sequential gelation and vitrification take place in the systems with relatively low f am to form transparent gels with a homogeneous matrix, whereas colloidal jamming and coarsening occur in the systems with high f am to form opaque gels with a colloidal network structure. The structure and properties of the glassy gels are determined by the hydrogen bond complexation and the microphase separation that are strengthened by the increase in f am . Based on these findings, the mechanical properties of hydrogels with high f am can be improved by suppressing the microphase separation during the gel synthesis. Understanding the structure-property relationship and regulation strategy of both microstructure and macroscopic performance of these glassy hydrogels should be inspirative for designing other tough materials with diverse applications as structural elements in biomedical and engineering fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Shanshan Tang,Lin Du
In order to explore the effect of methylation on the stability and spectral shift of hydrogen bond complexes, the complexes of 2,2,2-trifluoroethanol (TFE) with propylene oxide (PO) and isobutylene oxide (IBO) were investigated by Fourier transform infrared (FTIR) spectroscopy and ab initio computations. The comparable OH-stretching red shifts were observed upon complexation, and an enhancement of the OH-stretching band is shown with the partial pressure of monomers increasing. The OH-stretching frequency of TFE is red shifted by 180 and 201 cm −1 with PO and IBO, respectively. By using quantum chemical calculations , we predicted the geometric parameters, binding energies, and spectral shifts of TFE PO/IBO hydrogen bond complexes. The calculated and observed spectral shifts follow the same trends. Compared with the TFE ethylene oxide (EO) complex, the strength of the hydrogen bond in complex increases with the addition of methyl group , which likely results from the increase in basicity of the hydrogen bond acceptor. By combining the experimental integrated absorbance and the calculated IR intensity of the OH-stretching vibrational transition , the equilibrium constant for the complex formation was determined. In addition, atoms-in-molecules (AIM) and natural bond orbital (NBO) analyses were carried out to explain the red shift and the nature of the interaction in these complexes.
研究领域:
物理化学
·
分子光谱学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Fiber Materials
·
2021
·Vol. 3
·期 3
·172-179
·
IF 0
Zhu Miaomiao,Wang Weijie,Zhang Caihong,Zhu Liping,Yang Shuguang
Abstract Two azobenzene compounds, Disperse Red 1 (DR1) and 4-aminoazobenzene (Aazo), were separately linked to poly(acrylic acid) (PAA) side chains to form PAA-DR1 and PAA-Aazo, which were then associated with poly(ethylene oxide) (PEO) to produce hydrogen-bonded polymer complex fibers. After UV irradiation, the initial modulus and yielding strength of PAA-Aazo/PEO fiber were both increased tremendously, while the mechanical properties of PAA-DR1/PEO fiber only slightly changed. After drawn and dried in vacuum, PAA-DR1/PEO and PAA-Aazo/PEO fibers with an extended length exhibited a contraction of 20% and 25% under UV irradiation, showing potential for photo-actuation. Graphic Abstract
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
DYES AND PIGMENTS
·
2016
·
IF 4.055
Hailong Wang,Lele Zhao,Xueqiang Liu,Jing Xu,Wenlong Hou,Jianmin Wang,Enfang He,Ruijun Zhang,Haiquan Zhang
Among photocatalytic materials, p-n heterojunction-type photocatalysts has good photocatalytic performance under visible light irradiation. Herein, a novel Copper phthalocyanine/perylene diimide derivatives p-n heterojunction photoeatalysts based on the intermolecular hydrogen bond between pyridyl and carboxyl was designed and characterized using FT-IR, UV–vis and photoluminescence spectra, and then compared their photocatalytic performance by degradation for rhodamine B (RhB) under visible light irradiation. The hydrogen bond composites shows significant higher photocatalytic activity comparing with its parent, and the photocatalysis increased with increasing of mole fraction of perylene diimide derivatives. The change of morphology and p-n heterojunction structure are in favor of the high photocatalytic active. Furthermore, the photocatalytic mechanism was investigated by radical scavengers testing, that confirmed hydroxyl radical ( OH) was the main reactive species for the degradation of RhB.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Tao Qinqin,Wang Yusheng,Chen Chuanhong,Dai Ying
This study investigates the role of hydrogen bonding in Hydrogen-Bonded Complex Extractants (HBCEs) for uranium extraction from wastewater. Through integrated experimental and theoretical approaches including electrostatic potential (ESP) analysis, molecular binding energy calculations, Atoms in Molecules (AIM) theory, and spectroscopic characterization, we reveal how structural variations (carbon chain length, unsaturation degree, spatial configuration, and functional groups) modulate hydrogen bond characteristics. Results show that extending carbon chains enhances hydrogen bond strength (TBPO-18: -24.28 kcal/mol binding energy), while increasing unsaturation initially weakens then strengthens interactions. Linear structures exhibit superior hydrogen bonding versus cyclic configurations (TBPO-OH vs TBPO-HOH: 18.60 vs 14.47 kcal/mol). Extraction performance correlates with hydrogen bond stability, where TBPO-12 achieves maximum capacity (40.55 mg/L) due to optimal acid resistance. Mechanistic studies via 31 P NMR titration confirm a two-step process: initial \({\text{UO}}_{2}^{2 + }\) complexation with TBPO’s P = O group, followed by hydrogen bond formation with HBDs. This work provides fundamental insights for rational design of high-efficiency HBCEs, highlighting hydrogen bond engineering as a key strategy for nuclear wastewater treatment.
研究领域:
核化学
·
环境科学
·
分离技术
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 21
·10372-10380
·
IF 3.3
Yuanyuan Li,Jinming Liu,Wei Li,Yingru Li,Wei Zhao,Haiquan Zhang
Typically, perylene diimide radical anions have broad and strong absorption in the near-infrared light region and exhibit excellent photothermal conversion performance, so they are considered as new potential organic photothermal materials. However, the stability of perylene diimide radical anions in air has always been a thorny issue. We found an effective way to improve the stability of perylene diimide radical anions through formation of low barrier hydrogen bonds between perylene diimide radicals and alkyl primary amines. In this paper, we report the synthesis of a stable perylene diimide radical anion/α-phenylethylamine hydrogen bonded complex (α-PEA⋯PDI˙−), and preparation of a kind of α-PEA⋯PDI˙−/GO (graphene oxide) film using a simple impregnation method. Compared to GO films and α-PEA⋯PDI˙− powder, the film exhibited a good photothermal response with the highest photothermal conversion temperature of 82.4 °C under light, a temperature increase rate of up to 35 °C, and a photothermal conversion efficiency of 24.07%. The film is optically stable and reusable, and also exhibits superior performance compared to pure graphene oxide for solar water evaporation.
研究领域:
材料科学
·
化学
·
纳米技术
·
太阳能
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Siqi Zhuang,Jianhui Jia,Ying Lin,Yi He,Yu Liu,Hui Huang,Jian-Bo Chen
The analysis of N -oxide based explosives is beneficial to avoiding explosive risk and toxic hazard to the public. Nowadays, multifunctional sensors are scarce for green extraction and analysis of N -oxide based explosives. Herein, we have designed and developed two-in-one sensing solvents (DSMs) based on deep eutectic solvents with dual functions of both extraction and detection toward N -oxide based explosives. Besides, as an extraction solvent, DSM-3 based choline chloride and urea also can detect N -oxide based explosives via color change from yellow to red. The sensing mechanism of DSM-3 toward 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) as a prototype of N -oxide-based explosives has been fully investigated by experimental analysis and theoretical calculations. The proposed mechanism is based on the formation of H-bonding complexes between urea of DSM-3 and N -oxide group of LLM-105, which induces the charge transfer from urea to LLM-105. Further, this assay exhibits high selectivity, sensitivity and good visualization for the determination of LLM-105. Therefore, our study provides novel two-in-one sensing solvent for green, convenient and on-site detection of N -oxide based explosives.
研究领域:
化学
·
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Xin Ning Zhang,Cong Du,Zhou Wei,Miao Du,Qiang Zheng,Zi Liang Wu
We report a series of sponge-like hydrogels prepared by polymerizing an aqueous solution of methacrylic acid (MAAc) in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA), which results in hydrogen bond complexation, microphase separation, and formation of a unique colloidal network. The microstructure of the gels is determined by the coupling of microphase separation and gelation, which are influenced by the feeding concentrations of MAAc and TMEDA. Colloidal gels are only obtained at a relatively low concentration of MAAc in the presence of a certain amount of TMEDA. The structural evolution during the polymerization and the formation mechanism for the colloidal network are revealed by a combination of dynamic light scattering measurements and optical microscopy. It reveals that hydrogen bond complexes are formed between poly(methacrylic acid) (PMAAc) and TMEDA, leading to the formation of colloidal particles that assemble into clusters and then the interconnected colloidal network. The physical hydrogels with a colloidal network are stable in water and possess high stretchability and good self-recovery ability due to the robustness of colloidal particles joined by adhesive PMAAc chains. These sponge-like hydrogels are applied to remove dye molecules for water purification and devised into a solar vapor generation device to produce clean water. The strategy by harnessing reaction-induced phase separation should be applicable for other systems to engineering the microstructure and properties of functional materials toward specific applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Zhicheng Le,Zhijia Liu,Lilong Sun,Lixin Liu,Yongming Chen
Dysregulated inflammation is considered as an essential pathological process in inflammation-associated diseases, which would be aggravated by high levels of reactive oxygen species (ROS) generation inducing oxidative stress. Currently, extensive attention has been paid to polyphenolic compounds owing to their broad spectrum biological activities, such as antioxidant and anti-inflammatory effects, while their therapeutic potential has been compromised by the poor stability, short plasma half-life, and low bioavailability. Given that polyphenols have a wide range of structural characteristics and various physicochemical properties, there remains a real challenge toward green, mass production of universal nanocarriers for effective entrapment of these active pharmaceutical ingredients. In this study, we adopted a flash nanocomplexation (FNC) platform to prepare nanocomplexes comprising polyphenols and d-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) enabled by hydrogen bonding. We confirmed that the molecular structure of polyphenols has a great influence on their complexation with TPGS, and stable nanocomplexes were formed when the number of phenolic hydroxyl groups of polyphenols was above the value of 8. These hydrogen-bonded nanocomplexes produced by an FNC apparatus exhibited well-controlled quality with uniform size, good colloidal stability, and high batch-to-batch repeatability, thus improving the druggability as potent nanotherapeutics for antioxidant and anti-inflammatory applications. In vivo experiments indicated that the optimal nanocomplex (EGCG-NC) can be applied to ameliorate acute lung injury in a mice model after nasal administration. These results proved that polyphenols formulated with TPGS for nanocomplex formation through hydrogen-bonding complexation could augment their therapeutic potential for modulating hyperactive inflammation in the treatment of acute lung inflammation.
研究领域:
药理学
·
纳米技术
·
炎症
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
危险品化学品经营许可证（带存储）