bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of Highly Luminescent Chiral Nanographene
Authors: Li Ji‐Kun , Chen Xing‐Yu , Zhao Wen‐Long , Guo Yun‐Long , Zhang Yi , Wang Xin‐Chang , Sue Andrew C.‐H. , Cao Xiao‐Yu , Li Meng , Chen Chuan‐Feng , Wang Xiao‐Ye 
Published: November 2022

AbstractChiral nanographenes with both high fluorescence quantum yields (ΦF) and large dissymmetry factors (glum) are essential to the development of circularly polarized luminescence (CPL) materials. However, most studies have been focused on the improvement ofglum, whereas how to design highly emissive chiral nanographenes is still unclear. In this work, we propose a new design strategy to achieve chiral nanographenes with highΦFby helical π‐extension of strongly luminescent chromophores while maintaining the frontier molecular orbital (FMO) distribution pattern. Chiral nanographene with perylene as the core and two dibenzo[6]helicene fragments as the wings has been synthesized, which exhibits a record highΦFof 93 % among the reported chiral nanographenes and excellent CPL brightness (BCPL) of 32 M−1 cm−1.
Nickel‐Catalyzed Cross‐Electrophile 1,2‐Silyl‐Arylation of 1,3‐Dienes with Chlorosilanes and Aryl Bromides
Authors: Pan Qiu‐Quan , Qi Liangliang , Pang Xiaobo , Shu Xing‐Zhong 
Published: November 2022

AbstractCatalytic, three‐component, cross‐electrophile reactions have recently emerged as a promising tool for molecular diversification, but studies have focused mainly on the alkyl‐carbonations of alkenes. Herein, the scope of this method has been extended to conjugated dienes and silicon chemistry through silylative difunctionalization of 1,3‐dienes with chlorosilanes and aryl bromides. The reaction proceeds under mild conditions to afford 1,2‐linear‐silylated products, a selectivity that is different to those obtained from conventional methods via an intermediary of H(C)‐η3‐π‐allylmetal species. Preliminary mechanistic studies reveal that chlorosilane reacts with 1,3‐diene first and then couples with aryl bromide.
Halide Perovskite Single Crystals and Nanocrystal Films as Electron Donor‐Acceptor Heterojunctions
Authors: Shahjahan M. D. , Okamoto Takuya , Chouhan Lata , Sachith Bhagyashree Mahesha , Pradhan Narayan , Misawa Hiroaki , Biju Vasudevanpillai 
Published: November 2022

AbstractHalide perovskites are materials for future optical displays and solar cells. Electron donor‐acceptor perovskite heterostructures with distinguishing halide compositions are promising for transporting and harvesting photogenerated charge carriers. Combined e‐beam lithography and anion exchange are promising to develop such heterostructures but challenging to prepare multiple heterojunctions at desired locations in single crystals. We demonstrate swift laser trapping‐assisted band gap engineering at the desired locations in MAPbBr3microrods, microplates, or nanocrystal thin films. The built‐in donor‐acceptor double and multi‐heterojunction structures let us transport and trap photogenerated charge carriers from wide‐band gap bromide to narrow‐band gap iodide domains. We discuss the charge carrier transport and trapping mechanisms from the viewpoints of engineered bands and band continuity. This work offers a convenient method for designing single‐, double‐ and multi‐heterojunction donor‐acceptor halide perovskites for photovoltaic, photonic, and electronic applications.
Interbacterial Chemical Communication‐Triggered Nascent Proteomics
Authors: Liu Weibing , Tang Qi , Meng Liying , Hu Shufan , Sun De‐en , Li Shan , Dai Peng , Chen Xing 
Published: November 2022

AbstractMetabolic labeling with clickable noncanonical amino acids has enabled nascent proteome profiling, which can be performed in a cell‐type‐specific manner. However, nascent proteomics in an intercellular communication‐dependent manner remains challenging. Here we develop communication‐activated profiling of protein expression (CAPPEX), which integrates the LuxI/LuxR quorum sensing circuit with the cell‐type‐specific nascent proteomics method to enable selective click‐labeling of newly synthesized proteins in a specific bacterium upon receiving chemical signals from another reporter bacterium. CAPPEX reveals that E. coli competes with Salmonella for tryptophan as the precursor for indole, and the resulting indole suppressed the expression of virulence factors in Salmonella. This tryptophan‐indole axis confers attenuation of Salmonella invasion in host cells and living mice. The CAPPEX strategy should be widely applicable for investigating various interbacterial communication processes.
Stable Luminescent [Cu(NN)(PP)]+ Complexes Incorporating a β‐Cyclodextrin‐Based Diphosphane Ligand with Metal‐Confining Properties
Authors: Phan Tuan‐Anh , Armaroli Nicola , Saavedra Moncada Alejandra , Bandini Elisa , Delavaux‐Nicot Béatrice , Nierengarten Jean‐François , Armspach Dominique 
Published: November 2022

AbstractA β‐cyclodextrin‐based diphosphane with metal‐confining properties was efficiently synthesized thanks to an unprecedented Smiles‐like rearrangement of diphenyl‐(2‐phosphanylphenyl)phosphane in the presence of excess n‐BuLi. The cis‐chelating bidentate ligand is capable of forming very stable heteroleptic [Cu(NN)(PP)]+ complexes in which a metal‐bound diimine ligand (bpy, phen, or mmp) is located within the cyclodextrin cavity. As a result of ligand encapsulation, flattening of the metal tetrahedral geometry in the excited state is disfavored, thereby resulting in enhanced luminescent properties.
Manganese‐Catalyzed Hydrogenative Desulfurization of Thioamides
Authors: Wang Zelong , Chen Silin , Chen Chao , Yang Yunhui , Wang Congyang 
Published: November 2022

AbstractEarth‐abundant transition metal catalysis has emerged as an important alternative to noble transition metal catalysis in hydrogenation reactions. However, there has been no Earth‐abundant transition metal catalyzed hydrogenation of thioamides reported so far, presumably due to the poisoning of catalysts by sulfur‐containing molecules. Herein, we described the first manganese‐catalyzed hydrogenative desulfurization of thioamides to amines or imines. The key to success is the use of MnBr(CO)5instead of commonly‐employed pincer‐manganese catalysts, together with simple NEt3and CuBr. This protocol features excellent selectivity on sole cleavage of the C=S bond of thioamides, in contrast to the only known Ru‐catalyzed hydrogenation of thioamides, and unprecedented chemo‐selectivity tolerating vulnerable functional groups such as nitrile, ketone, aldehyde, ester, sulfone, nitro, olefin, alkyne and heterocycle, which are usually susceptible to common hydride‐type reductive protocols.
Designing Thiophene‐Enriched Fully Conjugated 3D Covalent Organic Framework as Metal‐Free Oxygen Reduction Catalyst for Hydrogen Fuel Cells
Authors: Bao Rui , Xiang Zhehao , Qiao Zelong , Yang Yongping , Zhang Yuting , Cao Dapeng , Wang Shitao 
Published: November 2022

AbstractThe application of three‐dimensional (3D) covalent organic frameworks (COFs) in renewable energy fields is greatly limited due to their non‐conjugated skeletons. Here, we design and successfully synthesize a thiophene‐enriched fully conjugated 3D COF (BUCT‐COF‐11) through an all‐thiophene‐linked saddle‐shaped building block (COThTh‐CHO). The BUCT‐COF‐11 exhibits excellent semiconducting property with intrinsic metal‐free oxygen reduction reaction (ORR) activity. Using the COF as cathode catalyst, the assembled anion‐exchange membrane fuel cells (AEMFCs) exhibited a high peak power density up to 493 mW cm−2. DFT calculations reveal that thiophene introduction in the COF not only improves the conductivity but also optimizes the electronic structure of the sample, which therefore boosts the ORR performance. This is the first report on the application of COFs as metal‐free catalysts in fuel cells, demonstrating the great potential of fully conjugated 3D COFs as promising semiconductors in energy fields.
Crystallization behavior of milk fat, palm oil, palm kernel oil, and cocoa butter with and without the addition of cannabidiol
Authors: Cooney Joseph , Hilton Isaac , Marsh Melissa , Jones Annalisa , Martini Silvana 
Published: November 2022

AbstractThe objective of this study was to evaluate the effect of cannabidiol (CBD) on the crystallization behavior and physical properties of various fats. Anhydrous milk fat (AMF), palm oil (PO), palm kernel oil (PKO), and cocoa butter (CB) were chosen for this study, for their unique crystallization behaviors. CBD was added at 1 and 2.5% wt/wt to these fats, and the crystallization behavior was evaluated at 26°C for AMF and PO and at 22°C for PKO and CB. Control samples with no CBD were prepared and evaluated as well. Results show that CBD delayed the crystallization of all fats with the least effect observed for the PO. Slight increases in crystal size were observed with the addition of CBD for all samples. CBD did not affect the melting profile of AMF or CB, but it increased the peak temperature of PO and decreased the enthalpy of PKO. Similarly, hardness was only affected by CBD in PO samples, with harder materials obtained for samples containing 2.5% CBD. The same trend was observed for elasticity. In addition, the elasticity of AMF increased with the addition of CBD but not its hardness. Overall, this study indicates that the effect of CBD on fat crystallization is highly dependent on the type of fat used. Producers of fat‐based products that are willing to include CBD in their formulations must carefully control processing conditions to ensure product quality.
Sustained antioxidant properties of epigallocatechin gallate loaded halloysite for PLA as potentially durable materials
Authors: Yao Zhongyang , Gong Weiguang , Li Chenyang , Deng Zhaopeng , Jin Yi , Meng Xin 
Published: November 2022

AbstractHalloysite nanotube (HNT) was etched by hydrochloric acid, and epigallocatechin gallate (EGCG) was loaded into the etched HNT (HH) to prepare loaded antioxidant (HH‐E) for polylactic acid (PLA) with improved thermal‐oxidative stability. The loading process was confirmed by TGA and FT‐IR, and the loading capacity was 16.15%. The presence of EGCG on the surface of etched HNT was further confirmed by nitrogen adsorption and TEM. The effect of loaded EGCG on thermal‐oxidative stability of PLA was characterized by the change in OOT values of PLA after the aging process under 140°C. The results showed that HH‐E increased OOT values of PLA from 231.2°C to 293.6°C at first, indicating that HH‐E provided PLA with excellent thermal‐oxidative stability. Furthermore, as can be seen from the trend of OOT changing over aging time, during the 14 days aging process, OOT values of PLA composites with HH‐E decreased more slowly than that of PLA composites with EGCG alone, endowing PLA with sustainable thermal‐oxidative stability. Further kinetic analysis showed that the apparent activation energy of the degradation process (Ea) of PLA composites with HH‐E changed less than that of PLA composites with EGCG alone, which showed that the loading system provided PLA better sustainable stability. Moreover, the isothermal crystallization process of modified PLA was characterized by DSC and POM. The results showed that HH‐E provided heterogeneous crystal nucleus for PLA, reducing the half crystallization time (t0.5) and improvement of crystallization rate for PLA. These results prove that HH‐E exhibited excellent performance in improving the thermal stability and crystallization property of PLA, showing multifunctional characterization.
Polyphenylalanine ionic liquid for the extraction and determination of Allura red in food samples
Authors: Song Hanyang , Yang Jing , Zhu Xiashi 
Published: November 2022

AbstractPoly amino acids ionic liquid {3‐(3‐(7‐(diethylamino)‐2‐carbonyl‐2 h‐amino‐3‐propyl)‐1‐ethyl Bromo imidazole P[Phe][EMI]} was synthesized and characterized with Fourier transform infrared spectroscopy (FTIR), hydrogen nuclear magnetic resonance (1H‐NMR), and scanning electron microscopy (SEM). A novel method based on solid‐phase extraction and high‐performance liquid chromatography for the detection of Allura red (AR) was established. Under optimized conditions, the linear range of AR was 0.01–10.00 μg ml−1, the limit of detection (LOD) was 0.004 μg ml−1 and the enrichment factor was 12.5 (volume of solution/volume of elution). The isothermal adsorption, kinetic model, and Gaussian calculation model was explained by the adsorption mechanism of AR on P[Phe][EMI]. The method was applied to the analysis of real samples with recoveries of 92.0%–102.2% and relative standard deviations of 1.0%–4.6%.
Design and properties of dynamic self‐healing polyurea molecule based on disulfide bonds
Authors: Wen Jie , Wang Lin , Li Rui , Tang Qin , Yan Jinyuan , Song Dayu 
Published: November 2022

AbstractAlthough thermosetting polymer materials have excellent mechanical properties, they are less self‐healing, recycling than thermoplastic polymer materials, which may cause a serious waste of resources. Herein, a series of polyurea materials with high mechanical strength, good properties of self‐healing and recycling are prepared by adjusting the ratio of polyether polyol and introducing disulfides into the synthesis of polyurea prepolymer in an innovative way. The composite polyurea (FHPUA) materials with tensile strength over 47 MPa and elongation at break of 720% are prepared. The experimental results show that by adjusting the content of aromatic disulfide, the tensile strength is further increased to 52 MPa, and the heat resistance of the material is improved. Through five self‐healing experiments, the surface of the material recovers as before even after continuous heating at 70°C for 1 h. In addition, the tensile strength of the material recovers 86.56% and the elastic modulus recovers 70.21% after four recycling experiments. In practical application, it is expected to fill the shortcomings of traditional polyurea such as micro cracks, short service life and poor performance, and have great potential applications in the fields of coating layer of heavy‐duty conveyor belts, encapsulation film of electronic devices and building facade coating.
Effect of ultrasound treatment on bacteriostatic activity of piezoelectric PHB‐TiO2 hybrid biodegradable scaffolds prepared by electrospinning technique
Authors: Sarıipek Fatma Bayram , Özaytekin İlkay , Erci Fatih 
Published: November 2022

AbstractIn this study, biodegradable piezoelectric poly(3‐hydroxybuthyrate) (PHB) and PHB‐TiO2 as well as non‐piezoelectric poly(ε‐caprolactone) (PCL) fibrous scaffolds were successfully fabricated. First, TiO2 nanoparticles (NPs) with various content (1%, 2%, and 3% wt) were loaded into the PHB matrix to improve its tensile and wettability properties as well as piezoelectric performances. The piezoelectric property of the fibrous scaffolds was examined and a significant improvement in the piezoelectric property of hybrid fibrous scaffolds compared to pure PHB was detected. For the PHB‐2%TiO2 sample, a maximum of in the range 4.5–5 V electricity production from a height of 10 cm and a mass drop of 35 g was observed after 150°C heat treatment. Then, an in vitro bactericidal analysis was carried out to test the bacteriostatic effect of the produced piezoelectric biomaterials against E‐cherichia coli (E coli) under ultrasound treatment. It was observed that E. coli appeared to be the most sensitive to the PHB‐%2TiO2 sample and consequently the antibacterial activity of all the samples against E. coli was dependent on the piezoelectric properties of the samples. The results indicated that the fabricated fibrous scaffolds could be considered as a promising piezoelectric biomaterial with ultrasonically‐controlled bacteriostatic activity for various tissue engineering applications.
Virus removal from aqueous environments with polyelectrolyte coatings on a polypropylene fleece
Authors: Schulze Maiko , Nie Chuanxiong , Hartmann Greta , Nickl Philip , Kulka Michaël W. , Ballauff Matthias , Haag Rainer 
Published: November 2022

AbstractThe adsorption of viruses from aqueous solution is frequently performed to detect viruses. Charged filtration materials capture viruses via electrostatic interactions, but lack the specificity of biological virus‐binding substances like heparin. Herein, we present three methods to immobilize heparin‐mimicking, virus‐binding polymers to a filter material. Two mussel‐inspired approaches are used, based on dopamine or mussel‐inspired dendritic polyglycerol, and post‐functionalized with a block‐copolymer consisting of linear polyglycerol sulfate and amino groups as anchor (lPGS‐b‐NH2). As third method, a polymer coating based on lPGS with benzophenone anchor groups is tested (lPGS‐b‐BPh). All three methods yield dense and stable coatings. A positively charged dye serves as a tool to quantitatively analyze the sulfate content on coated fleece. Especially lPGS‐b‐BPh is shown to be a dense polymer brush coating with about 0.1 polymer chains per nm2. Proteins adsorb to the lPGS coated materials depending on their charge, as shown for lysozyme and human serum albumin. Finally, herpes simplex virus type 1 (HSV‐1) and severe acute respiratory syndrome coronavirus type 2 (SARS‐CoV‐2) can be removed from solution upon incubation with coated fleece materials by about 90% and 45%, respectively. In summary, the presented techniques may be a useful tool to collect viruses from aqueous environments.
Effects of mechanical recycling on optical properties and microstructure of recycled high‐density polyethylene pellets and bottles
Authors: Zeng Shao‐Fu , Guo Pan , Hu Chang‐Ying , Wang Zhi‐Wei 
Published: November 2022

AbstractThe demand for recycling high‐density polyethylene (HDPE) utilizing mechanical recycling technologies is currently felt strongly by both society and industry. However, thermal oxidation of the polymer during the recycling process may lead to irreversible changes in the material properties of recycled high‐density polyethylene (rHDPE). The effects of mechanical recycling on the optical characteristics and microstructure of rHDPE pellets and bottles were investigated in this study. The results revealed that the apparent color of the rHDPE became more yellow and gray compared to the virgin HDPE (vHDPE), and showed a signal at 670–680 nm in the solar reflectance spectrum. The thermal oxidation of rHDPE considerably raised the absorption intensities of carbonyl, ester, and hydroxyl groups in attenuated total reflection Fourier transform infrared spectrum. In addition, the presence of carbonyl and hydroxyl unsaturated chemicals might make it challenging to recognize the distinctive peaks of vHDPE in the ultraviolet–visible diffuse reflectance (UV–Vis‐DIR) spectra at wavelengths less than 400 nm. Thermal oxidation of rHDPE was also confirmed in the COH, CO, and OCO valence structures of C1s and O1s. A characteristic valence band (VB) profile at 25 eV can be used as the recognizable information for the oxidation of rHDPE. The microstructure of the surface of rHDPE pellets exhibited rough and uneven morphological defects. The higher recycled content made rHDPE bottles' surface morphology rougher and their cross‐section microstructure thinner and more porous than vHDPE bottles.
Amino‐terminated hyperbranched polymer functionalized graphene oxide with in situ trapped silver nanoparticles for high‐performance antibacterial nonwoven fabric
Authors: Zhou Jiahui , Yan Yi , Zhang Yue , Zhang Yufan , Zhang Desuo , Lin Hong , Chen Yuyue , Zhao Bing , Xiong Jiaqing 
Published: November 2022

AbstractAntibacterial fabric with high thermal stability and mechanical strength is important for personalized protection, especially under the background of coronavirus pandemic (COVID‐19). This paper presents a facile approach toward high‐efficient antibacterial polypropylene spunbonded nonwoven fabrics (SNFs), which are decorated by a composite of graphene oxide embedded with silver nanoparticles (AgNPs/GO) through dip‐coating and in situ reduction effect of pre‐introduced amino‐terminated hyperbranched polymer (HBP‐NH2). Typically, HBP‐NH2 was grafted onto the GO nanosheets, then silver ions were trapped and self‐reduced by the HBP‐NH2 to generate silver nanoparticles decorated GO. The produced AgNPs are uniformly dispersed on the GO with a size of 13 nm. As an antibacterial coating, the Ag/GO composite could tightly wrap the SNFs fibers through the dip‐padding method, capable of enhancing the thermal stability and mechanical property of SNFs. The treated SNFs exhibited excellent antibacterial activities (~99.9%) against both Echerisia coli and Staphylococcus aureus, promising important potential for biomedical and personal protection applications.
Temperature dependent charge transport in electrostatically doped poly[benzimidazobenzophenanthroline] thin films
Authors: Cruz‐Arzon Alejandro J. , Serrano‐Garcia William , Pinto Nicholas J. , Gupta Nikita , Johnson Alan T. Charlie 
Published: November 2022

AbstractCharge transport in electrostatically doped poly[benzimidazobenzophenanthroline]‐BBL thin films in a field‐effect transistor geometry were investigated in the temperature range 150 K < T < 370 K. At low temperatures activation and hopping transport mechanisms dominated, while phonon scattering dominated at high temperatures. The activation energies (EA) were found to lie in the range 140 meV < EA < 400 meV implying the existence of deep traps within the polymer bandgap of 1.8 eV. Two quasi‐linear dependencies of EA on the gate voltage (Vg) were observed with EA decreasing as Vg increased. An unexpected “metallic‐like” transport characteristic appeared for T > 335 K which depended on Vg. Enhanced electron delocalization combined with increased carrier density could be responsible for this “metallic‐like” behavior. Our results show that the existence of deep traps with multiple energy distributions, combined with increased carrier density led to the unusual temperature dependence of charge transport observed in BBL.
Highly moisture resistant super gas barrier polyelectrolyte complex thin film
Authors: Chiang Hsu‐Cheng , Iverson Ethan T. , Schmieg Kendra , Stevens Daniel L. , Grunlan Jaime C. 
Published: November 2022

AbstractPolyelectrolyte complex (PEC) thin films have demonstrated remarkable oxygen barrier properties, but the moisture sensitivity from the hydrophilic nature of polyelectrolytes is a significant drawback. In this study, various molar ratios (1:1, 1:2, and 1:3) of branched polyethyleneimine (PEI) and poly(acrylic acid) (PAA) were prepared as one‐pot coating solutions, which can be deposited via a simple dip‐coating process and cured with a citric acid buffer solution, which increases the charge density of PEI and triggers complexation. As‐prepared conformal thin films impart excellent gas barrier, high modulus, and high moisture resistance. Undetectable oxygen transmission rate (OTR), at both 0% and 90% RH, can be achieved with a PEI:PAA molar ratio of 1:1 and buffer curing at pH 3. The strong complexation from ionic crosslinking creates an unusually dense thin film that is promising for various packaging applications (food, electronics, etc.). This thin film exhibits one of the best‐ever polymer‐based oxygen barriers at high humidity.