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In situ sulfur-doped mesoporous tungsten oxides for gas sensing toward benzene series

Chinese Chemical Letters 2024年第7期35卷 502-507页

作者： Yu Deng Yan Liu Yonghui Deng Jinsheng Cheng Yidong Zou Wei Luo State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan UniversityShanghai 200433China Department of Polymeric Materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China Henry-Fork School of Food Sciences Shaoguan UniversityShaoguan 512005China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Benzene series as highly toxic gases have inevitably entered human life and produce great threat to human health and ecological environment,and thus it is distinctly meaningful to monitor benzene series with quickly,real-time and efficient ***,novel sulfur-doped mesoporous WO_(3)materials were synthesized via classical in-situ solvent evaporation induced co-assembly strategy combined with doping engineering,which possessed highly crystallized frameworks,high specific surface area(40.9–63.8 m^(2)/g)and uniform pore size(~18 nm).Benefitting from abundant oxygen vacancy and defects via S-doping,the tailored mesoporous S/m WO_(3)exhibited excellent benzene sensing performance,including high sensitivity(50 ppm vs.48),low detection limit(ca.500 ppb),outstanding selectivity and favorable *** addition,the reduction of band gap resulted from S-doping promotes the carrier migration in the sensing materials and the reaction at the gas–solid sensing *** provides brand-new approach to design sensitive materials with multiple reaction sites.

关键词： Mesoporous materials Benzene series Tungsten oxides Sulfur doping Gas sensor

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Rationally Leveraging polymer Chain-Length Heterogeneity for Robust Structural engineering

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CCS Chemistry 2024年第8期6卷 1965-1977页

作者： Zhanhui Gan Luyang Li Dongdong Zhou Zhuoqi Xu Zhuang Ma Jiawen He Weihua Li Xue-Hui Dong South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640 State Key Laboratory of Molecular Engineering of Polymers Key Laboratory of Computational Physical SciencesDepartment of Macromolecular ScienceFudan UniversityShanghai 200433 College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065 Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou 510640

The inherent uncertainty of chain length in synthetic polymers casts doubt on the explicit understanding of fundamental *** study quantitatively assesses the critical role of chain-length distribution in the self-assembly process,aiming to identify the point at which discernible discrepancies begin to *** blending discrete diblock copolymers of varying sizes,chain-length nonuniformity can be precisely regulated while the average composition remains *** a minor heterogeneity leads to an expansion of lattice dimension,while a phase transition occurs as the difference exceeds a ***,a transition from the Frank–Kasperσphase to the body-centered cubic phase was triggered by enlarging the size difference of the corona block,while introducing heterogeneity in the core block stabilized the hexagonally close-packed spheres.A self-consistent field theory calculation reveals that the synergy between the long and short chains effectively releases packing frustration,leading to substantial changes in the free-energy landscape and stabilizing unconventional phases otherwise *** work calls particular attention to the importance of chain-length heterogeneity and provides a robust approach to finely tuning the phase behavior and physical properties of block copolymers without altering their chemical composition.

关键词： discrete polymer molecular weight distribution self-assembly hexagonally close-packed phase Frank-Kasper phases

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Manipulating noncovalent conformational lock via side-chain engineering for luminescence at aggregate level

Aggregate

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Aggregate 2024年第4期5卷 349-359页

作者： Mingbing Lian Yingxiao Mu Zecong Ye Ziying Lu Jingping Xiao Jianyu Zhang Shaomin Ji Haoke Zhang Yanping Huo Ben Zhong Tang School of Chemical Engineering and Light Industry Analytical and Testing CenterGuangdong University of TechnologyGuangzhouChina Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials University of GroningenGroningenThe Netherlands MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhouChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongGuangdongChina

The unfavorable photochemical processes at the molecular level have become a bar-rier limiting the use of aromatic amides as high-performance luminescent ***,we propose a reliable strategy for manipulating noncovalent conformational lock(NCL)via side-chain engineering to burst out eye-catching luminescence at the aggregate *** to the invisible emission in dilute solutions,dyad OO with a three-centered H-bond gave the wondrous crystallization-induced emis-sion with a quantum yield of 66.8%and clusterization-triggered emission,which were much brighter than those of *** calculations demonstrate that crystallization-induced planarized intramolecular charge transfer(PICT),con-formation rigidification,and through-space conjugation(TSC)are responsible for aggregate-state *** NCL composed of intramolecular N-H⋅⋅⋅Ointeractions could boost molecular rigidity and planarity,thus greatly facilitating PICT and *** study would inspire researchers to design efficient luminescent materials at the aggregate level via rational conformational control.

关键词： aromatic amide clusterization-triggered emission crystallization-induced emission noncovalent confor-mational lock side-chain engineering

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Mesoatomic engineering for programmable Spherical Packing Superlattices in Self-Assembly of Giant Molecular Clusters

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CCS Chemistry 2025年第2期7卷 440-451页

作者： Yuchu Liu Qing-Yun Guo Zongwu Huang Huanyu Lei Tong Liu Xiao-Yun Yan Feng-Gang Bian Zhiwei Lin Gengxin Liu Wei Zhang Mingjun Huang Rui Zhang Stephen Z.D.Cheng South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640 School of Polymer Science and Polymer Engineering University of AkronAkronOH 44325 Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Material Science and EngineeringDonghua UniversityShanghai 201620 Department of Pharmaceutical Science School of PharmacyUniversity of PittsburgPittsburgPA 15261 Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou 510640

In the realm of soft matter,the self-assembly of giant molecules into predefined spherical packing super-lattices offers a promising avenue for creating mate-rials with specific *** this work,we leverage mesoatomic engineering of giant molecular clusters to construct complex alloy superlattices,carefully tailoring structural parameters such as branching density,linker rigidity,and molecular *** approach led to the controlled formation of spherical mesoatoms,which organize into superlattices,including Frank-Kasper(FK)and quasicrystalline *** experimental analysis with molecular dynamics simulations,we elucidated quantitative relationships that span from molecular structures and mesoatomic config-urations to the resulting superlattice *** exploration advances our understanding of mesoatomic manipulation as a pivotal tool for super-lattice engineering,thereby laying the groundwork for the design of metamaterials with predefined properties and enhanced functionalities.

关键词： soft matter self-assembly Frank-Kasper phase giant molecules spherical packing superlattices

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A low-cost and environmentally-friendly chitosan/spent coffee grounds composite with high photothermal properties for interfacial water evaporation

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Journal of Industrial and engineering Chemistry 2023年 126卷 283-291页

作者： Hsieh, Po-Cheng Chen, Yi-Chun Zheng, Nai-Ci Mangindaan, Dave Chien, Hsiu-Wen Department of Chemical and Materials Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Department of Forestry National Chung-Hsing University Taichung40227 Taiwan Professional Engineering Program Department Faculty of Engineering Bina Nusantara University Jakarta11480 Indonesia National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan

The present study explores the remarkable photothermal properties and potential applications exhibited by melanoidin-enriched spent coffee grounds (SCGs). However, the inherent challenge lies in the substantial particle size of SCGs, leading to rapid sedimentation within the medium and resulting in uneven heat distribution during photothermal analysis. To overcome this obstacle, acid hydrolysis was employed to liquefy the SCGs, allowing their dispersion in water and significantly enhancing their light absorption capacity. The photothermal properties of liquefied SCGs (LSCGs) were analyzed under 808-nm near-infrared (NIR) irradiation and compared with those of SCGs. Remarkably, the photothermal conversion efficiency of the LSCGs was as high as 52%, twice that of SCGs. To further explore their potential, the LSCGs were incorporated into chitosan (CS) to create homogenous and porous CS/LSCGs composites. These low-cost and environmentally friendly CS/LSCGs composites, made entirely from waste materials, demonstrated photothermal properties under NIR irradiation. Notably, they exhibited excellent performance in multiple cycles of water evaporation experiments, achieving an impressive water evaporation efficiency of nearly 90%. © 2023 The Korean Society of Industrial and engineering Chemistry

关键词： Lignocellulose

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Flexible nanohybrid substrates utilizing gold nanocubes/nano mica platelets with 3D lightning-rod effect for highly efficient bacterial biosensors based on surface-enhanced Raman scattering

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Journal of materials Chemistry B 2024年第13期12卷 3226-3239页

作者： Chen, Yan-Feng Lu, Ming-Chang Lee, Chia-Jung Chiu, Chih-Wei Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Ph.D. Program in Clinical Drug Development of Herbal Medicine College of Pharmacy Taipei Medical University Taipei11031 Taiwan

In this study, gold nanocubes (AuNCs) were quickly synthesized using the seed-mediated growth method and reduced onto the surface of two-dimensional (2D) delaminated nano mica platelets (NMPs), enabling the development of AuNCs/NMPs nanohybrids with a 3D lightning-rod effect. First, the growth-solution amount can be changed to easily adjust the AuNCs average-particle size within a range of 30-70 nm. The use of the cationic surfactant cetyltrimethylammonium chloride as a protective agent allowed the surface of AuNCs and nanohybrids to be positively charged. Positively charged nanohybrid surfaces presented a good adsorption effect for detecting molecules with negative charges on the surface. Additionally, the NMP surfaces were rich in ionic charges and provided a large specific surface area for stabilizing the growth of AuNCs. Delaminated AuNCs/NMPs nanohybrids can generate a 3D hotspot effect through self-assembly to enhance the Raman signal. Surface-enhanced Raman scattering (SERS) is highly sensitive in detecting adenine biomolecules. Its limit of detection (LOD) and Raman enhancement factor reached 10−9 M and 3.6 × 108, respectively. Excellent reproducibility was obtained owing to the relatively regular arrangement of AuNC particles, and the relative standard deviation (RSD) was 10.7%. Finally, the surface of NMPs was modified by adding the hydrophilic poly(oxyethylene)-diamine (POE2000) and amphiphilic PIB-POE-PIB copolymer at different weight ratios. The adjustment of the surface hydrophilicity and hydrophobicity of AuNCs/NMPs nanohybrids led to better adsorption and selectivity for bacteria. AuNCs/POE/NMPs and AuNCs/PIB-POE-PIB/NMPs were further applied to the SERS detection of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli, respectively. The SERS-detection results suggest that the LOD of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli reached 92 CFU mL−1 and 1.6 × 102 CFU mL−1, respectively. The AuNCs/POE/NMPs and AuNCs/P

关键词： Substrates

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The Influence of Peroxide on Bubble Stability and Rheological Properties of Biobased Poly(lactic acid)/Natural Rubber Blown Films

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Chinese Journal of polymer science 2022年第2期40卷 197-207页

作者： Peerapong Chanthot Noppadon Kerddonfag Cattaleeya Pattamaprom Research Unit in Polymer Rheology and Processing Department of Chemical EngineeringFaculty of EngineeringThammasat UniversityPathum Thani 12120Thailand National Metal and Materials Technology Center National Science and Technology Development AgencyThailand Science ParkPathum Thani 12120Thailand

This study investigated the effects of natural rubber(NR)and an organic peroxide on the rheological properties,mechanical properties,morphology,and bubble stability during film blowing of poly(lactic acid)(PLA).The NR and peroxide contents were varied from 0 wt%to 25 wt%and 0 wt%to 0.5 wt%,*** results confirmed that the presence of well-dispersed NR could significantly improve the toughness,elongation at break,and processability of PLA films,where the optimal amount of NR was 15 wt%.For the reactive blending with peroxide,a suitable peroxide content for good film toughness and clarity was 0.03 wt%,while the higher content of 0.1 wt%could provide slightly higher *** contents are considered much lower than that in the PLA system(without NR),which required up to 0.5 wt%*** rheological studies indicated that the melt strength,the storage modulus(G’)and complex viscosity(η*)at low frequency could be correlated with good film blowing processability of the PLA/NR films at low gel *** parameters failed to correlate in the films having high gel contents as the deformation rate experienced by each test was different leading to the different levels of response to the type and amount of gels.

关键词： Poly(lactic acid) Natural rubber Film blowing stability Peroxide Rheological properties

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Developing Lignin/Pva- Tea Tree Oil Composites for Enhanced Antibacterial and Antifungal Properties

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Biomedical materials and Devices 2025年第1期3卷 682-687页

作者： Adithyamol, V.V. Varma, Payal Kandasdubramanian, Balasubramanian Polymer Science Central Institute of Petrochemical Engineering and Technology (IPT) HIL Colony Kerala Kochi 683501 India Department of Metallurgical and Materials Engineering Defence Institute of Advanced Technology (DU) Ministry of Defence Pune Girinagar 411025 India

This study investigates lignin-based bio-composites incorporated with polyvinyl alcohol (PVA) and varying concentrations of tea tree oil to assess their antibacterial and antifungal properties. Lignin, a complex aromatic polymer with an intricate three-dimensional network, is enriched with conjugated systems and oxygenated functional groups, including hydroxyl, methoxy, and carbonyl groups. The novel bio-composites exhibit significant antimicrobial activity, demonstrating potent antibacterial efficacy against Escherichia coli and Staphylococcus aureus as well as notable antifungal properties. Detailed characterization through FTIR and SEM provides critical insights into the structural and antimicrobial attributes of the composite films. The results indicate that PVA-lignin composite films enhanced with tea tree oil show superior resistance to microbial proliferation. This underscores the potential of these bio-composites in applications such as medical devices, packaging materials, and environmental protection, addressing the increasing demand for eco-friendly antimicrobial alternatives. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Antimicrobial activity Biocomposites Lignin Tea tree oil

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Revealing the Effect of Branched Side Chain Length on polymer Aggregation and Paracrystallinity for Improved Mobility-Stretchability Properties

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ACS Applied Electronic materials 2024年第3期6卷 1797-1808页

作者： Shih, Yen-Han Chen, Guan-Lin Liu, Pang-Hsiao Tseng, Kai-Wei Lee, Wen-Ya Chen, Wen-Chang Wang, Leeyih Chueh, Chu-Chen Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Center for Condensed Matter Science National Taiwan University Taipei10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering & Biotechnology National Taipei University of Technology Taipei10608 Taiwan Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan

Alkyl side chain engineering has long been used to improve the solubility of conjugated polymers. However, systematic studies on the effect of different alkyl branch lengths on morphological modulation and mobility-stretchability properties are still lacking. Here, we synthesize three fluorinated benzothiadiazole-based polymers (PC12BTDFT, PC16BTDFT, and PC20BTDFT) with different alkyl branch lengths and evaluate their structure-aggregation-stretchability correlations. The results show that longer side chains alleviate severe aggregation and form short-range aggregates, leading to a higher stretching ability without sacrificing high mobility (∼0.1 cm2 V-1 s-1). Also, a higher degree of paracrystallinity produced by longer side chains improves the release of tensile stresses, resulting in more significant retention of crystalline structural domains and the maintenance of higher mobility after being subjected to mechanical forces, as evidenced by the significant difference in mobility after 60% strain (7.64 × 10-4 cm2 V-1 s-1 for PC12BTDFT and 0.011 cm2 V-1 s-1 for PC20BTDFT). Our results show the effect of the side chain length on the aggregation behavior and microstructure between polymer chains. Furthermore, a clear dependence between paracrystallinity and stretchability is identified from the changes in morphology and charge transport behavior, providing a valuable perspective for the design of high-performance stretchable conjugated polymers. © 2024 The Authors. Published by American Chemical Society.

关键词： Organic field effect transistors

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Boosting overall water splitting by incorporating sulfur into NiFe(oxy)hydroxide

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Journal of Energy Chemistry 2022年第1期31卷 364-371,I0010页

作者： Chiho Kim Seong Hyun Kim Seunghun Lee Ilyeong Kwon Seong Hyun Kim Shinho kim Changgyu Seok Yoo Sei Park Yangdo Kim Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea BK21 Four Innovative Graduate Education Program for Global High-tech Materials&PartsPusan National UniversityBusan 46241Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH).Pohang 37673Republic of Korea

Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water ***-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal *** incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH *** enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of *** performance for overall water splitting was achieved with an alkaline water *** was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural *** study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and *** addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.

关键词： Overall water splitting Hydrogen production Sulfur incorporated NiFe(oxy)hydroxide Electrocatalysts Solar-driven water splitting

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