INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qiannan Liu,Chao Bi,Honghai Hu,Zhenzhen Zhang,Bing Zhang
Three-dimensional (3D)-printed intestinal stents based on thermoplastic starch (TPS)/polylactic acid (PLA) are a promising biodegradable alternative to conventional metal stents. However, the influence of the structure and conformation of starch on the properties of 3D-printed TPS/PLA intestinal stents requires clarification. This study evaluated the effects of the amylose/amylopectin ratio of starch on the molecular orientation, molecular interactions, crystallization behavior, microstructure, and thermodynamic, mechanical and hydrolysis performance of 3D-printed TPS/PLA intestinal stents. The molecular orientation of starch was determined during the preparation of the filaments for 3D printing. The 3D printing process promoted intermolecular interactions by further improving the molecular orientation, and enhanced the short-range order and crystallinity of the starch molecules. Decreasing the amylose/amylopectin ratio enhanced the short-range order of the starch molecules by increasing molecular orientation, which improved the circumferential compression performance of the 3D-printed intestinal stents but not the axial compression performance. However, the reduction in plasticized starch particles and improved PLA continuity caused by decreasing the amylose/amylopectin ratio contributed to improving the circumferential and axial compression performance as well as the anti-hydrolysis performance. These findings highlight the potential of starch to replace PLA as an inexpensive raw material for the development of high-performance biodegradable 3D-printed intestinal stents.
研究领域:
生物材料学
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医学工程
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 21
·
IF 3.1
Li Zuo,Yang Xiaotian,Wang Hao,Yao Gang,Tao Minlong,Sun Kai,Wang Junzhong
The interplay between orientation transition and chiral self-assemblies of para -terphenyl (P3P) molecules on the Cd(0001) surface has been investigated using low temperature scanning tunneling microscopy and density functional theory calculations. Three distinct molecular orientations have been discerned from the self-assembled thin films of P3P. At the low coverage, flat-lying molecules appear in the homochiral domains with the incommensurate registry to the substrate. With the coverage increasing, the incoming molecules are incorporated into the first layer with edge-on orientation and form the self-assembled zigzag chains. The alternative arrangement of zigzag chains with opposite chirality leads to the formation of a c(4 × 2) superstructure, in which the tilted molecules exhibit orientational frustration and fuzzy noises. The analysis of the tunneling spectra reveals that the electronic structure of P3P layers is contingent upon the hybridization between the electronic states of P3P molecules and the Cd(0001) surface. These results provide important insights into the interplay between orientational transition and chiral assembly of P3P molecules on metal substrates.
研究领域:
物理化学
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表面科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 15
·
IF 3.1
Zhao Miao Miao,Du Na,Zhu Yu Ying,Yen Fei
Many solid crystals exhibit a structural phase transition where a subset of its ions or entire molecules become orientationally ordered. As to why such ordering occurs remains mostly unresolved. We consider the extremely weak magnetic elements arising from the reorientations of the molecules experiencing mutual resonance to play the chief role. Two new features are identified in d -camphor: (1) the magnetic susceptibility abruptly changes when crossing the order–disorder phase transition at T II–III = 239.8 K during cooling and at T III–II = 245.2 K during warming and (2) the complex dielectric constant exhibits two successive discontinuities only 0.2 K apart near the critical temperatures when the sweeping rate is only 0.1 K/min. We discuss how the change in entropy associated with order–disorder transitions in plastic crystals represents temporal changes rather than spatial changes in the system. Our findings may be extended to study why many other crystalline solids exhibit orientational ordering and irreversibility.
研究领域:
物理学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 19
·4886
·
IF 3.1
Yuxiu Yu,Weiku Wang,Yaodong Liu
This paper investigates the effects of pre-gelation on cellulose dissolved in LiCl/DMAc solutions to enhance the properties of regenerated cellulose materials. This study focuses on characterizing the crystallinity, molecular orientation, and mechanical performance of cellulose fibers and hydrogels prepared with and without pre-gelation treatment. X-ray diffraction (XRD) analysis reveals that crystallinity improvement from 55% in untreated fibers to 59% in fibers pre-gelled for 3 and 7 days, indicating a more ordered arrangement of cellulose chains post-regeneration. Additionally, XRD patterns show improved chain alignment in pre-gelled fibers, as indicated by reduced full width at half the maximum of Azimuthal scans. Mechanical testing demonstrates a 30% increase in tensile strength and a doubling of the compression modulus for pre-gelled fibers compared to untreated fibers. These findings underscore the role of pre-gelation in optimizing cellulose material properties for applications ranging from advanced textiles to biomaterials and sustainable packaging. Future research directions include further exploration of the structural and functional benefits of pre-gelation in cellulose processing and its broader implications in material science and engineering.
研究领域:
材料科学
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生物材料工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Rong Sun,Xinle Lu,Minlu Zhou,Jiamin Yao,Pengzhen Chen,Wen-Yi Tong,Chun-Gang Duan,Jun Zhang
In this study, the self-assembly structures of 2-methylbenzimidazole (MBI) molecules on Cu(100) and Cu(111) surfaces were examined using scanning tunneling microscopy (STM), atomic force microscopy (AFM), and density functional theory (DFT) calculations. It was found that MBI molecules form hydrogen-bonded structures in one-dimensional (1D) or two-dimensional (2D) configurations on both Cu(100) and Cu(111) surfaces. On the Cu(100) surface, the hydrogen-bonded lines are aligned along two equivalent Cu ⟨11̅0⟩ directions, matching the lattice of the underlying surface. This alignment agrees with calculation results, which shows MBI molecules preferentially adsorbing on hollow sites with their molecular backbones perpendicular to these lines. The molecular lines spread out across the surface area, and the distance between them gradually decreases as coverage increases, indicating repulsive interactions between the lines. Conversely, on the Cu(111) surface, the 1D molecular chains are curly, with the molecular backbones oriented in various directions relative to the substrate, indicating a weaker interaction between the molecules and the substrate compared to that on the Cu(100) surface. With further increases in coverage on both surfaces, densely packed 2D molecular structures emerge, albeit with different lattice parameters. The 2D structures on Cu(100) adjust to match the substrate, whereas those on Cu(111) may assume various orientations. The distance between molecules is greater on Cu(111) than on Cu(100), suggesting a restriction of hydrogen bonding structures on the Cu(100) surface. Additionally, a noticeable height difference among the molecules in the 2D structures was observed, possibly due to a slight tilting of the molecular backbone when more molecules are integrated into the lattice. These findings demonstrate how the assembly structures of molecules depend on the interaction between molecule–molecule and molecule–substrate interactions.
研究领域:
材料科学
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 8
·47086
·
IF 1.901
Ruirui Hu,Enlai Gao,Zhiping Xu,Luqi Liu,Guorui Wang,Hongwei Zhu,Zhong Zhang
Two types of electrospun polyoxymethylene nanofibers with rough and smooth surface morphologies [rough fibers (RFs) and smooth fibers (SFs), respectively] were successfully prepared via the control of the electrospinning voltages. Mechanical tensile tests showed that the RF nonwoven mats exhibited a much higher elongation (440%) than the SFs (180%) without sacrifices in the stiffness and strength. Scanning electron microscopy characterization revealed that the large ductility of a single RF resulted from its unique multiple-necking mode, which was induced by its rippled structural features. In the meantime, the large ductility led to a high molecular orientation under tension and further improved the strength and toughness of the RF nonwoven mats. In comparison, the SF behaved in a single-necking deformation mode, and this led to a rapid rupture behavior. This surface-morphology-dependent mechanical behavior helped us to deeply understand the relationship between the structure and properties and should guide the development of high-performance materials for load-bearing applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47086.
研究领域:
材料科学
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高分子科学
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产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2021
·
IF 1.905
Ze-zheng Yuan,Wei Chen,Yun-kai Shi,Xiao-dong Chu,Zheng-hong Huang,Lin Gan,Jia Li,Yan-bing He,Bao-hua Li,Fei-yu Kang,Hong-da Du
Aromatic polyimide (PI)-based graphite nanofibers were obtained from the graphitization of graphene oxide (GO)-doped electrospun PI nanofibers. GO improves the PI molecular orientation, crystalline structure and thermal conductivity of the resulting nanofibers. The degree of PI molecular orientation in the nanofibers is increased by the GO during fiber preparation. This improvement in molecular orientation produces an increase in the thermal conductivity of the graphite nanofibers, and the addition of only 0.1% GO has a significant effect. The GO not only affects the thermal conductivity, but improves the PI molecular orientation and its role as nucleation centers during graphitization. This approach and the resulting high thermal conductivity materials show great potential for practical applications.
研究领域:
材料科学
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热传导工程
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Haitao Zhou,Kun Huang
In conventional liquid-liquid extraction, Pt(IV) and Pd(II) chloride complex anions PtCl 6 2− and PdCl 4 2− in concentrated hydrochloric acid cannot be separated using simple amine extractants according to the ion association mechanism based on the thermodynamic difference in the interaction of their inner sphere coordinated chloride ions with protonated amine. This study exhibits a novel strategy for enhancing the separation of PtCl 6 2− and PdCl 4 2− anions using thin-layer organic membrane-based laminar flow (TOMLF) extraction by controlling the acidified primary amine N1923 (A-N1923) molecular orientation on the surface of concentrated hydrochloric acid with a laminar shear flow. Experiments revealed that the separation selectivity is primarily determined by the interaction of A-N1923 molecules with the outer sphere-bound water molecules around PtCl 6 2− and PdCl 4 2− anions, and is easily controlled by regulating the A-N1923 molecular orientation on the surface of laminar flow. It is a new phenomenon that has not been previously documented. The evolution of A-N1923 molecular orientation and complexation sites induced by laminar shear flow would result in a controllable spatial geometry recognition, therefore promoting or inhibiting the separation of PtCl 6 2− and PdCl 4 2− anions in concentrated hydrochloric acid. This work is expected to provide new insight into the development of hydration-sphere coordination strategies based upon shear-switch laminar flow for controllable host-guest molecule recognition at a flowing liquid-liquid interface.
研究领域:
化学工程
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材料科学
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分析化学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuanjun Zhao,Mengqiu Gao,Yanyang Qin,Xinyu Da,Xuetian Deng,Xin Jia,Kai Xi,Yaqiong Su,Shujiang Ding,Qiang Rong,Xiangpeng Kong,Guoxin Gao
Fabricating flexible composite polymer electrolytes (CPEs) with vertically aligned ion transport pathways is necessary for the application of solid-state lithium metal batteries (LMBs), yet the orientation of polymer matrix usually is disorder, thus the improvement in ionic conductivity is unsatisfied. Herein, we develop a simple electric field induced molecular orientation strategy to fabricate the flexible CPEs with vertically aligned ion transport pathways. Driven by direct current (DC) electric field (e.g. 1.5 MV m −1 ), the polar 15C5-Li + dipoles and monomer molecules are oriented regularly and cured to form flexible three dimension (3D) cross-linked structure. As a result, numerous vertically-aligned ion transport pathways have been generated in the vertically oriented arrangement CPEs, thus presenting highly enhanced ionic conductivities, mechanical strength and superb inhibition ability to lithium dendrite growth. When used as CPEs for Li||LiFePO 4 (LFP) batteries, the vertically oriented CPEs exhibit excellent rate and long-term cycle stability with a reversible discharge capability of 124.9 mAh g −1 after 350 cycles at 1C and 60 °C. However, the randomly oriented CPEs deliver much poor cycle and rate performance at the same conduction. It can also be compatible with NCM811|Li batteries at 30 °C. Therefore, our simple DC electric field induced molecular orientation strategy holds a great application promise to construct the fast ion transport channels for the all-solid-state LMBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 26
·2501117
·
IF 26.8
Yibo Kong,Wanhai Wang,Xiangwei Guo,Yuhui Yang,Tianyi Chen,Xiangjun Zheng,Wenxuan Yu,Yiming Wang,Mengting Wang,Yibo Hu,Chenran Xu,Yongjun Wu,Dawei Wang,Zijian Hong,Weihua Tang,Hongzheng Chen,Lijian Zuo
Molecular orientation stands as the quintessential hallmark of conjugated self-assembled monolayers (SAMs), which have recently catalyzed noteworthy advancements in organic photovoltaics (OPVs). Nevertheless, an unambiguous understanding of these directional arrangements and their impact on optoelectronic properties remains elusive. To address this issue, herein three SAMs with representative orientations, i.e., edge-on (BCZ-1), tilt-on (4PACz) and face-on (BCZ-2) are meticulously designed. These orientations have been rigorously validated by sum frequency generation vibrational spectroscopy and first-principles calculations. Remarkably, an unequivocal correlation between the molecular orientation and the device performance is discerned. Particularly, the edge-on oriented BCZ-1 exhibits the largest dipole moment normal to the electrode, accompanied by a dense and uniform coverage. These features collectively contribute to its strongest work function increment for ultra-fast hole extraction and minimum interfacial carrier recombination. As a result, a champion power conversion efficiency of 19.93% is achieved in devices based on BCZ-1 with D18:L8-BO as the active layer, representing one of the highest values reported for binary bulk heterojunction OPVs. Besides, BCZ-1 shows great potential for practical applications due to its superior up-scalability and enhanced device shelf-stability. Overall, this work offers in-depth insights into the orientation behaviors of SAMs, opening new avenues to unlock the efficiency potential of OPVs.
研究领域:
材料科学
·
有机电子学
·
光伏技术
·
表面化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Ren Li,Yulin Feng,Sen Zhang,Huijuan Zhang,Jing Wang
Although protein-based biomimetic fibers are available, green and inexpensive protein-based fibers remain a challenge to develop. Herein, a microfluidic chip was designed to prepare protein-based fibers using cellulose nanofibers and various plant-derived proteins, including wheat gluten, zein, soy protein, pea protein, and rice bran protein. Furthermore, a comprehensive elucidation of the plant protein fiber formation mechanism was conducted. The results showed that plant protein fibers prepared by microfluidic spinning had smooth surfaces, strong mechanical properties, high thermal stability and antioxidative activity, good digestibility, and low sensitization. Additionally, the strong hydrodynamic shear force produced during microfluidic spinning changed the secondary structure of the protein, which promoted the binding of protein molecules to cellulose nanofibers, thus enhancing the molecular orientation of both protein and nanofiber. Consequently, this study may facilitate the development of natural, environmentally friendly, and functional protein-based fibers.
研究领域:
材料科学
·
生物材料
·
生物技术
·
食品科学
·
纳米技术
✓ 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）