ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Shaoguang Li,Yuanyuan Wang,Zishuo Zhang,Yiming Wang,Hui Li,Fan Xia
The continuous, real-time monitoring of specific analytes in situ in biological fluids would provide personalized, high-precision pharmacokinetic information for the goal of precision medicine. Due to their conformationally linked signaling mechanism, electrochemical aptamer-based (E-AB) sensors are promising candidates for accurate measurements in such complex media. They suffer, however, from severe baseline drift when interrogated continuously and in real-time manner. In response, here, we investigate a couple of self-assembled monolayers in the application of E-AB sensors, achieving the improvement of their baseline stability and simultaneous modulation of sensor performance, e.g., target affinity and specificity.
研究领域:
分析化学
·
生物传感器
·
电化学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xinyu Zhao,Shujuan Yang,Furui He,Haifang Liu,Keyang Mai,Junhao Huang,Gaobo Yu,Yuhong Feng,Jiacheng Li
Functional Pickering emulsions that depend on the interparticle interactions hold promise for building template materials. A novel coumarin-grafting alginate-based amphiphilic telechelic macromolecules (ATMs) undergoing photo-dimerization enhanced particle-particle interactions and changed the self-assembly behavior in solutions. The influence of self-organization of polymeric particles on the droplet size , microtopography, interfacial adsorption and viscoelasticity of Pickering emulsions were further determined by multi-scale methodology. Results showed that stronger attractive interparticle interactions of ATMs (post-UV) endowed Pickering emulsion with small droplet size (16.8 μm), low interfacial tension (9.31 mN/m), thick interfacial film, high interfacial viscoelasticity and adsorption mass, and well stability. The high yield stress, outstanding extrudability (n 1 < 1), high structure maintainability, and well shape retention ability, makes them ideal inks for direct 3D printing without any additions. The ATMs provides an increased capacity to produce stable Pickering emulsions with tailoring their interfacial performances and, providing a platform for fabricating and developing alginate-based Pickering emulsion-templated materials.
研究领域:
材料科学
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化学工程
·
高分子化学
·
3D打印技术
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产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Xing Gong,Quantao Liu,Xuefei Liu,Pei Wan,Peng Jiang,Shuaichao Chen,Huan Wang,Shaopeng Wu
To increase the storage stability of polyurethane prepolymer (PUP), environmentally friendly end-capped PUP modifier was prepared to modify asphalt, which can improve the performance of bitumen while protecting the environment. Physical, chemical and mechanical characterizations of the end-capped PUP and the modified bitumen were conducted to fundamentally understand its modification mechanism. The outcomes demonstrated that the storage stability of PUP can be significantly increased by end-capping technology. End-capped PUP can be successfully uncapped in bitumen and used to modify bitumen. As a result of the interaction between PUP and the active spots within asphaltene and bituminous resin, urethane, urea, and amide linkages were created, creating a cross-linked structure. The modification procedure encourages the transformation of resin into asphaltene and the reconstruction of asphaltene. With the reorganization of asphaltene molecules and the strengthening of cross-linking, PUP modified bitumen have greatly improved their high temperature resistance. However, as curing time increases, bitumen's chemical composition changes, resulting in decreased low-temperature performance, but it is still better than the base bitumen. This research prepared high storage stability PUP and explored the mechanism of PUP to modify bitumen, which has guiding significance for the usuage of PUP modified bitumen.
研究领域:
材料科学
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化学工程
·
环境科学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yuan-Yuan Liu,Jian-Hua Cao,Yue Li,Ya-Kun Wang,Da-Yong Wu
In this work, we use 2-aminobenzimidazole and 2-aminobenzoxazole to end-cap colorless polymer, PAI TFDB-TPC-6FDA, in order to investigate methods for reducing the CTE value of products and their effects on other properties. Results show that, as the ratio of 2-aminobenzimidazole to the raw material, diamine TFDB, increases from 0:100 to 2:99, the CTE value of products gradually decreases from 20.0 to 12.9 ppm/K (a decrease of 36%). Nevertheless, the CTE value of products rebounds as the dosage of the end-capped groups exceeds this ratio. Among all the products obtained, PAI-1M film has the best overall properties: its CTE is 12.9 ppm/K, T d 5 is 518 ℃, T g is 366 ℃, T S is 191 MPa, T 430 is 85.1%, W A is 85.4% and C A is 0.8%. The two end-capped groups are of highly linear and rigid structures. They also help to enhance the hydrogen bonding between molecules, resulting in a decrease in d -spacing values. The results of molecular configuration simulation and calculation indicate that, using 2-aminobenzimidazole to end-cap the chains of PAI molecules is beneficial for suppressing the formation of the charge-transfer complexes (CTCs), and thereby offsetting impacts of the reduced molecular chain spacing on the transparency of films. Based on these two influencing factors, we confidently conclude that linear and rigid end-capped groups can effectively improve the dimensional stability and mechanical properties of PAI films without damaging their optical properties.
研究领域:
高分子科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 24
·2300371
·
IF 4.6
Shikun Zhao,Shun Gong,Biao Zhao,Like Hou,Lurong Zhang,Qing Hu,Kai Pan
Polyamide 56 (PA56) has gained significant attention in the academic field due to its remarkable mechanical and thermal properties as a highly efficient and versatile biobased material. Its superior moisture absorption property also makes it a unique advantage in the realm of fiber textiles. However, despite extensive investigations on PA56's molecular and aggregate state structure, as well as processing modifications, little attention has been paid to its polymerization mechanism. Herein, the influence of temperature and time on PA56's polycondensation reaction is detailed studied by end-group titration and carbon nuclear magnetic resonance (NMR) techniques. The reaction kinetics equations for the pre-polymerization and vacuum melt-polymerization stages of PA56 are established, and possible side reactions during the polycondensation process are analyzed. By optimizing the reaction process based on kinetic characteristics, PA56 resin with superior comprehensive properties (melting temperature of 252.6 °C, degradation temperature of 371.6 °C, and tensile strength of 75 MPa) is obtained. The findings provide theoretical support for the industrial production of high-quality biobased PA56.
研究领域:
材料科学
·
化学工程
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2019
·Vol. 11
·期 6
·1177-1187
·
IF 4.76
Yu Yang,Haichao Duan,Siwen Xia,Changli Lü
A novel and convenient method for fabricating homogeneous nanocatalysts with high catalytic activity and controllable reusability is promising for catalytic reduction. In this study, a high-efficiency magnetic recyclable nanocatalyst (PFe3O4@CD@PdNPs) was successfully prepared via depositing highly dispersed palladium nanoparticles (Pd NPs) on a thermo-responsive copolymer support functionalized with superparamagnetic Fe3O4 nanoparticles (NPs) with carbon dots (CDs) as both a stabilizing and reducing agent. The thermo-responsive copolymers with catechol end groups could be facilely anchored onto Fe3O4 NPs (PFe3O4) through a mussel-inspired chemistry strategy. The well-dispersed ultrafine Pd NPs were located on Fe3O4 NPs decorated with copolymer brushes using an episulfide ligand-containing copolymer as a costabilizer. Fourier transform infrared spectroscopy, thermogravimetric analysis and other tests proved that the copolymer brushes were successfully grafted on the surface of the Fe3O4 NPs. Moreover, transmission electron microscopy and X-ray photoelectron spectroscopy confirmed the presence of CDs in the nanohybrids. In addition, the PFe3O4@CD@PdNPs showed interesting thermo-responsive catalytic behaviour because of the presence of thermo-responsive polymer chains on the catalyst surface. Finally, owing to good water dispersibility and the synergistic effect of the Pd NPs with CDs, the PFe3O4@CD@PdNP nanocatalyst possessed higher catalytic activity for the catalytic reduction of different dyes and nitrophenols compared with PdNP@PFe3O4 without CD modification.
研究领域:
材料科学
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化学
·
纳米技术
·
催化
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Lixian Tian,Xianneng Song,Xi Yu,Wenping Hu
Facile modulation of the rectification behavior of a molecular junction device was achieved by humidity and alkali metal ions using a series of carboxylic acid-terminated self-assembled monolayers (COOH SAMs) on gold and eutectic gallium-indium alloy top contact (EGaIn). The rectification ratio (RR) increased significantly as the humidity (ranging from 1 to 39%) increases for an n-mercaptoalkanoic acid (HSCnO2H, n = 11, 12, 14, 16) SAM device. Meanwhile, K+/Na+, as the counterion of COO– in the same element group with H+, enhanced the RR of the SAM device as well. By the detailed study of the rectifying current–voltage (I–V) response using a theoretical model based on single-level tunneling, we found that the modulated rectification behavior of SAMs was attributed to the change in the coupling strength of the carboxylic group with the EGaIn electrode and the asymmetry factor of the junction in the presence of water and K+/Na+. Our study here suggested that the delicate electronic structure change at the molecule–(GaOx)GaIn interface played the most significant role in the modulation of the rectification performance of the SAM device. The molecule–(GaOx)GaIn interface thus offered a great research opportunity to achieve the desired function of SAM-GaIn-based molecular devices.
研究领域:
纳米技术
·
材料科学
·
电化学
·
表面化学
·
分子电子学
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DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 14
·2026-2035
·
IF 5.364
Wencheng Shi,Boyu Wu,Xiaofeng Guo,Anchao Feng,San H. Thang
Fluorescent end-functional mikto-arm star copolymers were prepared by an “arm-first” approach mediated by a mixture of macro-RAFT agents. RAFT copolymerization of coumarin-POEGMA, boron-dipyrromethene (BODIPY)-PDMA and bisindolylmaleimide (BIM)-PNIPAM with different fluorophore-labeled end-groups was performed with polyethylene glycol diacrylate as a cross-linker. The fluorescence spectra of fluorophore-labeled homopolymers showed that there was a good linear correlation existing between fluorescence intensity and polymer concentration in dilute solutions. According to the fluorescence results, after carefully choosing the peaks and calculation, the arm components of star polymers can be quantitatively analyzed with obvious similarity to 1H NMR approaches which are considered to be less valid in a complicated chemical environment. Overall, it is reasonably expected that the current study expands the characterization methods for star polymers and promotes the development of the synthesis of well-defined multifunctional star polymers.
研究领域:
聚合物科学
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材料化学
·
分析化学
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产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Zhang Jinbo,Jiang Lihang,Liu Shaofeng,Shen Junhao,Braunstein Pierre,Shen Yong,Kang Xiaohui,Li Zhibo
When aiming at the direct use of CO 2 for the preparation of advanced/value-added materials, the synthesis of CO 2 /olefin copolymers is very appealing but challenging. The δ-lactone 3-ethylidene-6-vinyltetrahydro-2 H -pyran-2-one (EVP), synthesized by telomerization of CO 2 with 1,3-butadiene, is a promising monomer. However, its chemoselective ring-opening polymerization (ROP) is hampered by unfavorable thermodynamics and the competitive polymerization of highly reactive C=C double bonds under usual conditions. Herein, we report the chemoselective ROP of EVP using a phosphazene/urea binary catalyst, affording exclusively a linear unsaturated polyester poly(EVP) ROP , with a molar mass ( M n ) up to 16.1 kg·mol −1 and a narrow distribution ( Ð < 1.6), which can be fully recycled back to the pristine monomer, thus establishing a monomer-polymer-monomer closed-loop life cycle. In these polyesters, the CO 2 content reaches 33 mol% (29 wt%). The reasons for the unexpected chemoselectivity were investigated by Density-functional theory (DFT) calculations. The poly(EVP) ROP features two pendent C=C double bonds per repeating unit, which show distinct reactivity and thus can be properly engaged in sequential functionalizations towards the synthesis of bifunctional polyesters. We disclose here a methodology providing a facile access to bifunctional and recyclable polyesters from readily available feedstocks.
研究领域:
材料科学
·
高分子化学
·
可持续化学
·
催化
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Genyuan Zhang,He Wen,Jing Wang,Ziwen Dai,Yimeng Shi,Hao Tan,Jinghao Dang,Shoujin Wang,Wenbo Yu,Sha Liang,Jiakuan Yang,Shushan Yuan
The development of high-performance nanofiltration membranes for efficient dye/salt separation remains a critical challenge in sustainable wastewater treatment. Herein, we report a tunable strategy to fabricate poly(p-phenylene terephthalamide) (PPTA)-based membranes with tailored pore architectures and surface functionalities. By employing low-temperature polycondensation of terephthaloyl chloride (TPC) and p-phenylenediamine (PPD) in an N-methyl-2-pyrrolidone (NMP) system, followed by selective end-capping, carboxyl- or amine-terminated membranes (PPTA tpc and PPTA ppd ) were synthesized. These membranes exhibited ultrafiltration-level permeance (643.1 and 697.3 L m −2 h −1 bar −1 ) but limited Congo Red (CR) rejection (∼90 %). To refine pore size, trimesoyl chloride (TMC) was utilized to crosslink surface amine groups, generating gradient-pore membranes (PPTA tpc -TMC m and PPTA ppd -TMC m ) with tunable crosslinking degrees. Systematic studies revealed that controlled crosslinking time enabled precise modulation of pore size, facilitating gradient dye rejection while balancing salt permeability. The optimized PPTA tpc -TMC 300s , PPTA ppd -TMC 20s , PPTA ppd -TMC 30s membranes achieved excellent separation factor of 710, 367, and 277 for NaCl/CR, NaCl/Acid Fuchsin (AF), and NaCl/Sunset Yellow (SY) solutions with a pure water permeance of 452.5, 42.5, 28.1 L m −2 h −1 bar −1 , respectively. Long-term stability tests confirmed sustained performance (>99 % dye rejection) due to crosslinking-enhanced structural rigidity. This study establishes a strategic paradigm for fabricating PPTA membranes with programmable pore architectures, elucidating the critical interplay between surface chemistry, tunable pore dimensions, and separation performance.
研究领域:
膜科学
·
高分子化学
·
分离技术
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Xuan Wu,Longjie Shi,Yang Zhang,Yier Wang,Chenchen Li,Yuhan Dou,Chaoran Li,Jiafeng Lu,Hong Dong,Zhirong Qu,Yanjiang Song,Chuanwu
To address the limitations of conventional polyurethane (PU) in electronic packaging (e.g., poor hydrophobicity, dielectric properties, and thermal stability), three mono-dihydroxyalkyl-terminated polysiloxanes (TMPME-PDMS, M NMR = 995–3318 g/mol) featuring a butyl/ether hybrid terminal structure were synthesized via hydrosilylation and chemically grafted into acrylate-end-capped PU. The resulting silicone-modified polyurethane acrylates (Si-PUAs) were UV-cured with a 3 wt% photoinitiator (HMPA/HCHMP = 1:1). Relative to pure PUA, the hydrophobicity and thermal stability were significantly enhanced, together with reduced dielectric properties. With a mere 1 wt% TMPME-PDMS ( M NMR = 3318 g/mol), the water contact angle was increased from 79.34° of pristine PU to 118.09°. When incorporating 10 wt% TMPME-PDMS ( M NMR = 2218 g/mol), the soft-segment decomposition temperature ( T gs) was elevated to 412.60 °C, which was 19.20 °C higher than unmodified PU. At 14.2 GHz, 10 wt% TMPME-PDMS ( M NMR = 3318 g/mol) reduced the dielectric constant to 2.67, 6.32 % lower than PU. The molecular weight ( M NMR ) and dosage of TMPME-PDMS critically governed microphase separation, crosslinking density, and surface migration, enabling tunable performance. This work provides a scalable strategy for high-performance UV-curable coatings in advanced electronics packaging.
研究领域:
材料科学
·
高分子化学
·
电子材料
·
涂层与表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peilong Ji,Li Liu,Qiang Liu,Bingke Li,Shanhao He,Keliang Wu,Xuejun Dong,Zhiyong Liu,Yanlong Tai
Ti 3 C 2 T x MXene is highly compelling as an energy storage material, but 2D MXene sheets experience significant stacking due to hydrogen bonding and van der Waals forces. This blocks active sites and impedes fast electrolyte ion transport. The pseudocapacitance of MXene materials is highly reliant on their terminal groups. Therefore, an effective strategy was designed herein to prepare an oxygen-rich 3D hierarchical porous MXene (P-OR-Ti 3 C 2 T x ). First, Zn powder was used as a template to construct three-dimensional hierarchical porous structures that spanned the microporous, mesoporous, and macroporous scales. Second, Zn powder was used as a metal reducing agent in a reaction at 500 °C to eliminate most −F terminal groups on the MXene. Then, a subsequent acid washing step was used to introduce numerous −O terminal groups. The energy storage process of the prepared MXene was investigated by in situ Raman. More redox active sites (−O terminal groups) are exposed by the constructed oxygen-rich 3D hierarchical porous MXene structure, which also provides a shorter pathway for electrolyte ion transport. P-OR-Ti 3 C 2 T x displays superb rate performance (88.19 % retention at 100 A g −1 ) and ultra-high capacitance (676.7F/g at 2 mV/s and 698.7 F g −1 at 1 A g −1 ) when used as a supercapacitor electrode. Moreover, a symmetric flexible supercapacitor device prepared using P-OR-Ti 3 C 2 T x and carbon cloth achieves a superb energy density of 32.8 Wh kg −1 at a power density of 236.5 W kg −1 . This study offers insight into the design of MXenes that exhibit both high capacity and excellent rate performance.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
电化学
·
超级电容器
✓ 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）