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Synergistic Manipulation of Phase Transition between Cocrystallization and Microphase Segregation in Conjugated Triblock Copolymers for Organic Field-Effect Transistors

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MACROMOLECULES 2024年第5期57卷 2067-2077页

作者： Zhu, Shuyin Li, Dingke Zhan, Hao Chen, shuwen peng, Juan Fudan Univ Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai 200438 Peoples R China

Compared to the impressive advances achieved in coil-coil block copolymers (BCPs) capable of crystallization, advances in conjugated rod-rod BCPs are somewhat limited owing to their semirigid characteristics. The ability to tune crystallization and microphase segregation in this class of BCPs enables efficient control of the microstructures and the physical and optoelectronic properties. Herein, we report the effective manipulation of the cocrystallization and microphase segregation in a series of conjugated triblock copolymers through meticulous control of the length of the middle amorphous block at the molecular level and scrutinize the close correlation between their crystalline structures and charge transport properties. Specifically, a family of poly(3-hexylthiophene)-block-poly[3-(6-bromohexyl)-thiophene]-block-poly(3-decylthiophene) (P3HT-b-P3BrHT-b-P3DT) BCPs was designed and synthesized, in which the central P3BrHT had a low rigidity and negligible crystalline property compared with the two outer P3HT and P3DT blocks. The shorter P3BrHT was favorable to the cocrystallization of the two outer P3HT and P3DT. Moreover, the phase transition from the cocrystallization of P3HT and P3DT to their microphase segregation was facilitated by increasing the length of the central P3BrHT (intrinsic factor) in conjunction with slow solvent evaporation and thermal treatment (extrinsic factors). Finally, the different crystalline structures of P3HT-b-P3BrHT-b-P3DT are strongly correlated with their optical and charge transport properties. This study provides insights into cocrystallization and microphase segregation in conjugated BCPs via meticulous molecular design at the molecular level and external processing strategies.

关键词： Crystal structure Crystallization Microphase Organic polymers Phase transitions

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Tailoring Polymorph, Cocrystallization, and Phase Separation in Conjugated Polymer Blends via Meniscus-Assisted Solution Shearing

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MACROMOLECULES 2023年第19期56卷 7737-7748页

作者： Chen, shuwen Zheng, Hao Dong, Yongjie peng, Juan Fudan Univ Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai 200438 Peoples R China

The ability to control the polymorph in conjugated polymers offers a robust means of scrutinizing the structure-property correlation as various polymorphs with a slight difference in crystal packing greatly impact their solid-state properties. Notably, despite a few studies on the polymorphs of conjugated homopolymers, polymorph control in conjugated polymer blends has yet to be explored. Herein, we report, for the first time, the tailoring of polymorphs (i.e., polymorphs I and II) in a set of poly(3-butylthiophene)/poly(3-hexylselenophene) (P3BT/P3HS) blends with various molecular weights (MWs) via a simple yet efficient meniscus-assisted solution-shearing (MASS) approach. The MASS process renders appealing polymorph transformation of the respective conjugated polymer as well as cocrystallization of either P3BT and P3HS or their phase separation, resulting in different optical properties for each blend. Specifically, P3BT-3K/P3HS-3K, P3BT-3K/P3HS-16K, and P3BT-16K/P3HS-16K blends display a phase-separated structure containing the respective P3BT and P3HS crystals in the drop-cast film, where P3BT-3K and P3BT-16K have polymorphs II and I, respectively, and P3HS-3K and P3HS-16K possess polymorphs II and I, respectively, with minor polymorph II in P3HS-16K as well. This contrasts with the cocrystallization formed in the drop-cast P3BT-16K/P3HS-3K film. Intriguingly, when subjecting the P3BT/P3HS blend solutions to the MASS, the polymorph of P3BT-3K in both P3BT-3K/P3HS-3K and P3BT-3K/P3HS-16K blends transform from polymorph II to I, and cocrystallizes with P3HS-3K in the P3BT-3K/P3HS-3K yet phase-separates with P3HS-16K in the P3BT-3K/P3HS-16K. Increasing MW in the P3BT-16K/P3HS-16K blend confers it to cocrystallize more readily than the low-MW P3BT-3K/P3HS-3K blend due to the more matchable crystal size in the former blend. The polymorph transformation kinetics and associated morphology evolution are scrutinized. These P3BT/P3HS blends with different crystalline stru

关键词： Conjugated polymers Crystal structure Crystallization Crystals Homopolymers

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适用于空间分集的GNSS信号跟踪环路设计

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无线电工程 2021年第6期51卷 470-475页

作者：彭舒文魏继栋刘庆樊龙江周丰华上海航天电子技术研究所上海201109

为解决火箭发射时姿态变化造成的信号接收不连续问题,提出了一种空间分集方式下的GNSS信号双锁相环路设计,对环路稳定性进行了分析,并给出了环路在单、双环切换时的处理方案。通过对此环路结构的分析和数学推导,证明了环路的可行性,并... 详细信息

为解决火箭发射时姿态变化造成的信号接收不连续问题,提出了一种空间分集方式下的GNSS信号双锁相环路设计,对环路稳定性进行了分析,并给出了环路在单、双环切换时的处理方案。通过对此环路结构的分析和数学推导,证明了环路的可行性,并通过仿真对环路在各个状态下的稳定进行了验证。仿真结果表明,双锁相环路在各个状态下均能实现稳定跟踪,且有一定的输出信噪比增益,解决了信号接收不连续的问题。

关键词：火箭空间分集导航接收机锁相环稳定性跟踪

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Study on the optimization of duration for repetitive projects considering spatial interference effects in operations

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JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEERING 2025年

作者： Zhang, Chunli Zhang, Fan Yin, shuwen Fu, Yan Liu, Jun Duan, peng Chongqing Jianzhu Coll Sch Intelligent Construct Chongqing Peoples R China Chongqing Univ Sch Management Sci & Real Estate Chongqing 400045 Peoples R China Wenshui Ctr Bur Publ Works Shenzhen Municipal Shenzhen Guangdong Peoples R China China Construct Second Engn Bur Ltd Technol Ctr Southwest Branch Beijing Peoples R China Chongqing Jianzhu Coll Sch Traff & Transportat Chongqing Peoples R China

In the field of project duration optimization, a substantial amount of research has already been conducted. Although these studies have made significant contributions to project management, they remain somewhat theoretical. Few researchers have addressed the issue of workspace interference among workers, which is common in construction processes, as a point of entry for optimizing duration. Therefore, we believe that there is room for further improvement in this area of research. This paper focuses on repetitive construction projects, considering the effects of workspace interference during actual construction. Through agent-based modeling, we simulate the construction environment to determine the relationship between crew size and unit duration changes. The findings reveal that agent-based models demonstrate high reliability in simulating worker efficiency. Furthermore, we propose a model for solving optimal duration based on simulation results, using a genetic algorithm, and analyze the calculation results, speed, and complexity of the genetic algorithm with a heuristic approach. The results indicate that the genetic algorithm has advantages in handling duration optimization problems with slightly more than 10 tasks.

关键词： Project duration optimization spatial interference effects agent-based modeling repetitive construction projects genetic algorithm

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Near-field and far-field competitive couplings between plasmonic nanodisk array and nanoparticles for rapid and facile heparin assay

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TALANTA 2025年 287卷 127690页

作者： Chu, shuwen Yuan, Huizhen Liang, Yuzhang Yang, Cheng Liu, Qiang peng, Wei Dalian Univ Technol Sch Phys Dalian 116024 Peoples R China Dalian Univ Coll Phys Sci & Technol Dalian 116622 Peoples R China Dalian Univ Technol Sch Chem Dalian 116024 Peoples R China Nanjing Normal Univ Sch Comp & Elect Informat Sch Artificial Intelligence Nanjing 210046 Peoples R China

Plasmonic biosensors hold an enticing prospect for drug testing and disease diagnostics as they have demonstrated impressive superiority in ultrasensitive and label-free detection. In this paper, we demonstrate a plasmonic sensing strategy for the heparin assay by leveraging near-field and far-field competitive couplings between gold (Au) nanoparticles (NPs) and nanodisk (ND) array. Specifically, the near-field coupling of the ND array and Au NPs binding to its surface results in a spectral redshift. Meanwhile, the far-field coupling of dispersed Au NPs in mixed solution and ND array induces a spectral blueshift. As a result, heparin concentration-dependent nearfield and far-field competitive couplings determine the direction and amount of the spectral shift. Compared with existing detection technologies, this sensing strategy also presents a balance point, enabling rapid assessment of heparin dosage safety. Additionally, an exceptionally wide dynamic range of 10-4 mu g/mL to 103 mu g/mL, a low detection limit of 29 pg/mL, and excellent selectivity are demonstrated. The analysis of heparin in serum further underscores this assay approach's potential for advancing disease diagnosis and therapeutic monitoring at the point of care.

关键词： Near-field and far-field couplings Competitive coupling Plasmonic nanostructure sensor Gold nanoparticles Heparin detection

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Effect of lateral inhomogeneous AlGaN barrier layer on electronic properties of GaN HEMTs

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MICRO AND NANOSTRUCTURES 2024年 191卷

作者： Guo, Yuchen Ren, Yuke peng, Zhihao Ma, Xiaochen Li, Shuti Zheng, shuwen South China Normal Univ Inst Semicond Sci & Technol Foshan 528225 Peoples R China South China Normal Univ Guangdong Engn Res Ctr Optoelect Funct Mat & Devic Inst Semicond Guangzhou 510631 Peoples R China

In this study, an AlGaN/GaN high electron mobility transistor with lateral inhomogeneous AlGaN barrier layer (LI-AlGaN HEMT) is proposed and studied systematically. The LI-AlGaN HEMT comprises three AlGaN regions with varying Al content, connected to the source, gate, and drain, respectively. With the increase of Al content in each region, the saturation current of the LI-AlGaN HEMT increases gradually, while the on -resistance (R on ) and breakdown voltage (BV) decrease. The threshold voltage (V th ) of the LI-AlGaN HEMT depends only on the Al content of AlGaN beneath the gate. By introducing the source field plate (FP), the calculated output current of the conventional FP-HEMT is consistent with the experimental data. After optimizing Al content, the LI-AlGaN FP-HEMT has the same V th compared with conventional FP-HEMT. However, the saturation current is increased by approximately 20 % and the R on is decreased by approximately 30 %. Additionally, the BV is increased to 1008 V. So the optimized lateral inhomogeneous AlGaN HEMT has better DC characteristics and is suitable for high power GaN device applications.

关键词： AlGaN/GaN HEMT Lateral inhomogeneous channel Threshold voltage Breakdown voltage

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Enhancing perovskite solar cell performance: The role of polymer-assisted hole transport layers in hot carrier dynamics

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CHEMICAL ENGINEERING JOURNAL 2024年 489卷

作者： Xu, Min Wang, peng Qi, shuwen Zhao, Rongjun Xie, Lin Hua, Yong Yunnan Univ Sch Mat & Energy Kunming 650091 Peoples R China Yunnan Univ Ctr Optoelect Engn Res Dept Phys Kunming 650091 Peoples R China

Enhancing the efficiency and stability is very critical for perovskite solar cells (PSCs) commercialization. Herein, we report an effective approach to enable highly efficient and stable PSCs by incorporating a polymer material, poly[N, N ' -bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5 ' -(2,2 ' -bithiophene) (named P(NDI2OD-T2)), into hole transport layer (HTL). Our research results exhibit that the addition of P (NDI2OD-T2) not only effectively improves the hole mobility and conductivity of HTL, but also makes its energy level more alignment with perovskite. More importantly, ultrafast carrier results demonstrate that the introduction of P(NDI2OD-T2) into Spiro-OMeTAD HTL can effectively improve the extraction and transfer of hot carriers from perovskite layer to HTL, and consequently reduce the recombination of charge carriers in the device. As a result, PSCs based on Spiro + P(NDI2OD-T2) as a HTL shows an enhanced power conversion efficiency (PCE) of 24.20 %, which is much higher than that of control device without P(NDI2OD-T2) (21.94 %). Furthermore, the un-encapsulated P(NDI2OD-T2)-treated PSCs exhibit excellent humidity, thermal and light stabilities, with the devices maintaining 94 % of its initial efficiency after 3000 h at approximate to 40 % humidity, 95 % of its initial efficiency after storage at 65 degrees C and 85 degrees C for 600 h, and 90 % of its initial efficiency after 600 h under one sun light irradiation, respectively. This work provides an effective strategy for improving the device efficiency and long-term stability of PSCs.

关键词： Spiro-OMeTAD Perovskite solar cell Additive Hot carriers Polymer

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Electroless Ni-P deposition on WC powders through direct PdCl2 activation and study on the underlying mechanisms

NEXT MATERIALS

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NEXT MATERIALS 2025年 6卷

作者： Tang, peng Jiang, shuwen Yan, Jiawei Li, Xianquan Dalian Polytech Univ Key Lab Liaoning Prov Coll New Mat & Mat Modificat Dept Mat Engn Dalian 116034 Peoples R China Dalian Univ Technol Sch Mat Sci & Engn Surface Engn Lab Dalian 116024 Peoples R China Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

The deposition of Ni-P on the surface of ceramic powders by the electroless method holds significant potential for enhancing the mechanical properties of the coating. In the conventional two-step electroless process, the utilization of tin chloride sensitization prior to palladium chloride activation for Ni-P deposition on ceramic particles in weak reducing systems is practically indispensable, as it enhances the secondary recovery of the plating solution by augmenting tin residues both on the powder surface and within the solution. Herein, we present a onestep direct activation of PdCl2 as an effective method for reducing Ni-P deposition on WC particles by facilitating adsorption on the low isoelectric point (I.E.P.) surface of WC particles. The strong negative surface charge facilitates the adsorption of palladium ions in the plating solution and thereby affording a lower elcetronic density, which facilating the Pd2 + reduced to form Pd0 species through the reduction of H2PO2- under a weak reducing system in chemical plating. The electroless plating for the deposition of nickel coatings on WC powders was realized through direct activation with PdCl2, thereby eliminating the conventional two-step SnCl2-PdCl2 pretreatment that requires pre-adsorption of Sn2+ from SnCl2 sensitization for activation.

关键词： WC Surface adsorption Electroless Nickel coatings Pd2+

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Konjac glucomannan: A key ingredient for controlling fibrous structure formation in walnut protein and wheat gluten meat analogues during the high-moisture extrusion process

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LWT-FOOD SCIENCE AND TECHNOLOGY 2025年 220卷

作者： Lei, shuwen Zhao, Chunyan Miao, Yue Zhao, Hong Fu, Xiaoping peng, Chunxiu Gong, Jiashun Yunnan Agr Univ Coll Food Sci & Technol Kunming 650201 Peoples R China Yunnan Acad Agr Sci Inst Agroprod Proc Kunming 650221 Peoples R China Yunnan Agr Univ Coll Hort & Landscape Kunming 650201 Yunnan Peoples R China Yunnan Acad Agr Sci Inst Med Plants Kunming 650201 Yunnan Peoples R China

This study focused on exploring the impact of different konjac glucomannan (KGM) contents (0, 1, 3, 5 g/100 g) on fibrous structure formation in walnut protein and wheat gluten high-moisture meat analogues (HMMAs). The results showed that KGM enhanced hardness, chewiness, springiness and fibrous degree of high-moisture meat analogues. KGM was observed to modify fibrous structure formation and orientation in HMMAs. Comprehensive analysis of the effect of KGM on the quality and microstructure of HMMAs revealed that when the addition content of KGM was 3 g/100 g, HMMAs had the highest fibrous degree, and the fibrous structure displayed strong toughness, and formed a more consistent, continuous and dense structure. Consequently, HMMAs with 3 g/100 g KGM was chosen for study the mechanism of KGM controlling fibrous structure formation in HMMAs during the high-moisture extrusion process. 3 g/100 g KGM improved HMMAs' thermal stability and apparent viscosity. 3 g/100 g KGM promoted more covalent and non-covalent bonds formation, thereby improving the cross-linking degree of protein molecules. 3 g/100 g KGM promoted natural protein disintegration from high-to low-molecular-weight forms, mainly with protein subunits 30-40 kDa. In addition, 3 g/100 g KGM enhanced protein structure orderliness. This study offers valuable information for developing plant-based protein meat analogues that have rich fibrous structures through the addition of exogenous polysaccharides.

关键词： Walnut protein Wheat gluten Konjac glucomannan Meat analogues Fibrous structure formation High-moisture extrusion process

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Series of New Alkali Metal Hafnium-Based Iodates A2Hf(IO3)6 (A = K, Rb, Cs) and Isomorphic Ba2Zn(IO3)6 with Large Birefringence

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CRYSTAL GROWTH & DESIGN 2025年第7期25卷 2146-2154页

作者： Zhao, shuwen Xue, Zhiyong Wen, Xin Yan, Yuchen Chen, Jindong peng, Guang Ye, Ning Tianjin Univ Technol Inst Funct Crystal State Key Lab Crystal Mat Tianjin Key Lab Funct Crystal Mat Tianjin 300384 Peoples R China Shandong Univ State Key Lab Crystal Mat Jinan 250100 Peoples R China Shandong Univ Inst Crystal Mat Jinan 250100 Peoples R China

Iodate is an important class of optoelectronic functional materials, however, only a few hafnium-based iodates have been reported at present. Herein, a series of alkali metal hafnium-based iodates A2Hf(IO3)6 (A = K, Rb, Cs) and isomorphic Ba2Zn(IO3)6 were synthesized by the hydrothermal method. These four crystals all crystallized in the trigonal system with an R 3 space group. Both Hf4+ and Zn2+ are six-coordinated with six IO3 - groups, forming a petal-shaped arrangement. Based on millimeter-sized crystals, their ultraviolet cutoff edges were measured as 329-347 and 288 nm, respectively. Theoretical calculation shows that they possess a large birefringence of 0.092-0.111@1064 nm. This work not only provides potential birefringent materials but also enriches the iodate system.

关键词： Birefringence

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