Pub Date : 2023-10-21DOI: 10.1142/s1793604723510232
Rui Zhou, Xin Huang, Fangfang Zhang
Mechanical metamaterials can achieve fantastic properties fabricated using artificial structural design. In this study, shape memory polymers (SMP) were combined to design variable gradient zero Poisson ratio mechanical metamaterials and 3D printing was used to fabricate complex structures. The shape memory performance of these structures was investigated by conducting simulation calculations to analyze the variations of zero Poisson’s ratio structures with different wall thicknesses, cell internal angles, and inclined wall length gradients. Through the analysis of structural dimension factors, it is concluded that the structures with smaller wall thickness and intracellular angle exhibit better shape memory performance. In order to further enhance the shape memory performance, several models with identical wall thickness and internal angles were designed to investigate the influence of inclined wall length gradients on shape memory characteristics, leading to the identification of optimal gradient structures. Finally, thermal cycling experiments were conducted on samples to validate the accuracy of the simulation results. The investigation of shape memory recovery characteristics in variable gradient zero Poisson’s ratio structures provides new insight and method for the optimization design and application of smart materials in mechanical metamaterial structures.
{"title":"Optimization Analysis of Variable Gradient Structures with Shape Memory Characteristics in zero Poisson's ratio Metamaterials","authors":"Rui Zhou, Xin Huang, Fangfang Zhang","doi":"10.1142/s1793604723510232","DOIUrl":"https://doi.org/10.1142/s1793604723510232","url":null,"abstract":"Mechanical metamaterials can achieve fantastic properties fabricated using artificial structural design. In this study, shape memory polymers (SMP) were combined to design variable gradient zero Poisson ratio mechanical metamaterials and 3D printing was used to fabricate complex structures. The shape memory performance of these structures was investigated by conducting simulation calculations to analyze the variations of zero Poisson’s ratio structures with different wall thicknesses, cell internal angles, and inclined wall length gradients. Through the analysis of structural dimension factors, it is concluded that the structures with smaller wall thickness and intracellular angle exhibit better shape memory performance. In order to further enhance the shape memory performance, several models with identical wall thickness and internal angles were designed to investigate the influence of inclined wall length gradients on shape memory characteristics, leading to the identification of optimal gradient structures. Finally, thermal cycling experiments were conducted on samples to validate the accuracy of the simulation results. The investigation of shape memory recovery characteristics in variable gradient zero Poisson’s ratio structures provides new insight and method for the optimization design and application of smart materials in mechanical metamaterial structures.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"130 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135463227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-21DOI: 10.1142/s1793604723400295
Hedong Li, Peihu Shen, Zizheng He, Yang Xu, Minjia Wang
In this study, submicron Sn[Formula: see text]-doped In 2 O 3 hollow particles (indium-tin oxide (ITO)) with a lyrium shell-like surface were synthesized via solvothermal method. The appropriate addition of these particles into polyvinylidene fluoride (PVDF) films exhibits high visible light transmission and effective UV/IR blocking properties, surpassing those of ITO nanoparticles. This can be attributed to the reduced absorption of UV/IR radiation by the hollow ITO particles, as well as their higher diffuse reflectivity and thermal insulation.
{"title":"Photothermal insulation mechanism of submicron ITO hollow particles in PVDF film","authors":"Hedong Li, Peihu Shen, Zizheng He, Yang Xu, Minjia Wang","doi":"10.1142/s1793604723400295","DOIUrl":"https://doi.org/10.1142/s1793604723400295","url":null,"abstract":"In this study, submicron Sn[Formula: see text]-doped In 2 O 3 hollow particles (indium-tin oxide (ITO)) with a lyrium shell-like surface were synthesized via solvothermal method. The appropriate addition of these particles into polyvinylidene fluoride (PVDF) films exhibits high visible light transmission and effective UV/IR blocking properties, surpassing those of ITO nanoparticles. This can be attributed to the reduced absorption of UV/IR radiation by the hollow ITO particles, as well as their higher diffuse reflectivity and thermal insulation.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135463437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-21DOI: 10.1142/s1793604723500224
Xiaolin Zhou, Jingxiao Zheng, Xia Zhang
Lipase-assisted catalytic esterification reactions have been concentrated on due to their green synthetic route for cinnamate acetate. In this paper, a high thermal stable Al-MOF (DUT-5) was chosen as a carrier to immobilize Porcine pancreatic lipase (PPL), and the resulting composites of PPL@DUT-5 were then employed in the catalytic transesterification reaction of cinnamyl alcohol and vinyl acetate. The adsorption conditions of PPL on the surface of DUT-5 were varied to optimize PPL loading uptakes, the adsorption kinetics were analyzed to explore the adsorption behavior of PPL on the DUT-5. In the catalytic transesterification reaction, the resulting PPL@DUT-5 represents the prominent enhanced catalytic stability under a varied reaction condition but with a higher catalytic activity, such as under the relative wide optimum pH value and at the increased operation temperature. And, the good reusability of the PPL@DUT-5 in cyclic catalytic processes highlights their prospect applications in the practical organic conversion reactions.
{"title":"Adsorption of PPL on a high thermal stable DUT-5 and their catalytic activity in a transesterification reaction of cinnamyl alcohol and vinyl acetate","authors":"Xiaolin Zhou, Jingxiao Zheng, Xia Zhang","doi":"10.1142/s1793604723500224","DOIUrl":"https://doi.org/10.1142/s1793604723500224","url":null,"abstract":"Lipase-assisted catalytic esterification reactions have been concentrated on due to their green synthetic route for cinnamate acetate. In this paper, a high thermal stable Al-MOF (DUT-5) was chosen as a carrier to immobilize Porcine pancreatic lipase (PPL), and the resulting composites of PPL@DUT-5 were then employed in the catalytic transesterification reaction of cinnamyl alcohol and vinyl acetate. The adsorption conditions of PPL on the surface of DUT-5 were varied to optimize PPL loading uptakes, the adsorption kinetics were analyzed to explore the adsorption behavior of PPL on the DUT-5. In the catalytic transesterification reaction, the resulting PPL@DUT-5 represents the prominent enhanced catalytic stability under a varied reaction condition but with a higher catalytic activity, such as under the relative wide optimum pH value and at the increased operation temperature. And, the good reusability of the PPL@DUT-5 in cyclic catalytic processes highlights their prospect applications in the practical organic conversion reactions.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"2 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135463223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1142/s1793604723400349
S. Harish, Muhammad Hamza, P. Uma Sathyakam, Annamalai Senthil Kumar
Nanostructured thin-film electrode materials are proposed for supercapacitors due to their outstanding performance over bulk materials. In this work, we fabricated a TiO 2 nanotube film over a titanium foil using a top-down approach for supercapacitor electrodes. We noticed that the fabricated nanotubes are uniform and well aligned, confirmed by FESEM; the TiO 2 nanotube parameters were further simulated using COMSOL Multiphysics. Simulations show an areal capacitance of 1.19393 pF/cm 2 with oxidation and reduction peak currents of 6.18921 × 10[Formula: see text] A and − 6.0320 × 10[Formula: see text] A, respectively, at 10 mV/s scan rate. The as-prepared nanotubes show a poor areal capacitance of 1.0193 F/cm 2 , which is improved to 12.8764 F/cm 2 at a scan rate of 10 mV/s, that is approximately 12.63 times with oxidation and reduction peak currents of 0.129 mA/cm 2 and − 0.105 mA/cm 2 , respectively, by performing an electrochemical etching. Further, the surface roughness of both as-prepared and etched samples is studied to comment on their surface area changes. The effect of the etched sample is studied, compared and validated with simulation, which reveals that the etched TiO 2 nanotubes thin-film sample shows considerable similarity with the simulation results.
{"title":"Simulation and Fabrication of Titanium dioxide thin films for supercapacitor electrode applications","authors":"S. Harish, Muhammad Hamza, P. Uma Sathyakam, Annamalai Senthil Kumar","doi":"10.1142/s1793604723400349","DOIUrl":"https://doi.org/10.1142/s1793604723400349","url":null,"abstract":"Nanostructured thin-film electrode materials are proposed for supercapacitors due to their outstanding performance over bulk materials. In this work, we fabricated a TiO 2 nanotube film over a titanium foil using a top-down approach for supercapacitor electrodes. We noticed that the fabricated nanotubes are uniform and well aligned, confirmed by FESEM; the TiO 2 nanotube parameters were further simulated using COMSOL Multiphysics. Simulations show an areal capacitance of 1.19393 pF/cm 2 with oxidation and reduction peak currents of 6.18921 × 10[Formula: see text] A and − 6.0320 × 10[Formula: see text] A, respectively, at 10 mV/s scan rate. The as-prepared nanotubes show a poor areal capacitance of 1.0193 F/cm 2 , which is improved to 12.8764 F/cm 2 at a scan rate of 10 mV/s, that is approximately 12.63 times with oxidation and reduction peak currents of 0.129 mA/cm 2 and − 0.105 mA/cm 2 , respectively, by performing an electrochemical etching. Further, the surface roughness of both as-prepared and etched samples is studied to comment on their surface area changes. The effect of the etched sample is studied, compared and validated with simulation, which reveals that the etched TiO 2 nanotubes thin-film sample shows considerable similarity with the simulation results.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"73 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135514122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1142/s1793604723510244
Suyang Wang, Weilin Jia, Yingying Deng, Jie Shen, Jun Cao, Peng Wang, Ping Zhao, Yuanyu Wang, Qi Sun
Type A molecular sieves have been extensively employed in various fields. It is noteworthy that the direct synthesis of type A molecular sieves from natural kaolin is a common practice among researchers. Traditional type A molecular sieves are characterized by a three-dimensional cubic lattice structure. In this study, our objective is to facilitate the transformation of type A molecular sieves into a two-dimensional layered configuration by employing a two-dimensional layered material as a templating agent. In this research, natural kaolin serves as the primary source material. To eliminate impurities including quartz, illite, and dolomite, an alkali-based solvent extraction method is employed, yielding amorphous silicon and aluminum compounds. Subsequently, a graphene-based templating agent is introduced, and a hydrothermal synthesis process is employed to fabricate two-dimensional type A molecular sieves. The method described herein yields two-dimensional layered type A molecular sieves with a crystallinity exceeding 90%, thereby resulting in a specific surface area that is approximately 11-fold greater compared to their three-dimensional type A counterparts. The applicability of this methodology can be extended to the valorization of low-grade natural mineral resources, optimizing their utility. Furthermore, the approach presented herein for the synthesis of two-dimensional molecular sieves is of a universal nature, offering valuable insights that can serve as a reference for the synthesis of various other categories of two-dimensional molecular sieves.
{"title":"Synthesis of 2-D Type A molecular sieves by alkaline removal of natural kaolin","authors":"Suyang Wang, Weilin Jia, Yingying Deng, Jie Shen, Jun Cao, Peng Wang, Ping Zhao, Yuanyu Wang, Qi Sun","doi":"10.1142/s1793604723510244","DOIUrl":"https://doi.org/10.1142/s1793604723510244","url":null,"abstract":"Type A molecular sieves have been extensively employed in various fields. It is noteworthy that the direct synthesis of type A molecular sieves from natural kaolin is a common practice among researchers. Traditional type A molecular sieves are characterized by a three-dimensional cubic lattice structure. In this study, our objective is to facilitate the transformation of type A molecular sieves into a two-dimensional layered configuration by employing a two-dimensional layered material as a templating agent. In this research, natural kaolin serves as the primary source material. To eliminate impurities including quartz, illite, and dolomite, an alkali-based solvent extraction method is employed, yielding amorphous silicon and aluminum compounds. Subsequently, a graphene-based templating agent is introduced, and a hydrothermal synthesis process is employed to fabricate two-dimensional type A molecular sieves. The method described herein yields two-dimensional layered type A molecular sieves with a crystallinity exceeding 90%, thereby resulting in a specific surface area that is approximately 11-fold greater compared to their three-dimensional type A counterparts. The applicability of this methodology can be extended to the valorization of low-grade natural mineral resources, optimizing their utility. Furthermore, the approach presented herein for the synthesis of two-dimensional molecular sieves is of a universal nature, offering valuable insights that can serve as a reference for the synthesis of various other categories of two-dimensional molecular sieves.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135514407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1142/s1793604723510268
Z.F. Gu, Z.C. Yu, B. Hong, J.C. Xu, Y.B. Han, X.L. Peng, H.L. Ge, X.Q. Wang
Owing to the special planar structure and very high resistivity, [Formula: see text]-type hexaferrites possess the high initial permeability and cut-off frequency, indicating great application potential in high-frequency devices. Strontium Co 2 Z hexaferrites (Sr 3 Co 2 Fe[Formula: see text]O[Formula: see text]) were successfully prepared by the sol–gel method and calcined at the different temperatures from 1175[Formula: see text]C to 1250[Formula: see text]C. The influence of the calcined temperatures on the microstructure, phase structures, magnetic properties and microwave absorption behavior of all samples was investigated in detail. All results indicated that strontium hexaferrites go through the [Formula: see text]-, [Formula: see text]-, [Formula: see text]-, and [Formula: see text]-phase transformation process from 1175[Formula: see text]C to 1250[Formula: see text]C, and S-1200 (calcined at 1200[Formula: see text]C) is confirmed to be Co 2 Z-type hexaferrites. S-1200 showed the highest imaginary permeability while the imaginary permittivity of all samples is close to zero, indicating the excellent microwave adsorption behavior of strontium Co 2 Z hexaferrites. The reflection loss results indicate that S-1200 exhibits the best microwave absorption performance with the RL value of − 32.4 dB for 4.0 mm thickness at 4.72 GHz, according to the impedance matching and quarter-wavelength theory.
由于特殊的平面结构和极高的电阻率，[公式:见文]型六铁氧体具有较高的初始磁导率和截止频率，在高频器件中具有很大的应用潜力。采用溶胶-凝胶法成功制备了锶co2z六铁体(Sr 3 Co 2 Fe[公式:见文]O[公式:见文])，并在1175[公式:见文]C至1250[公式:见文]C的不同温度下进行了煅烧。研究了煅烧温度对样品微观结构、相结构、磁性能和微波吸收性能的影响。结果表明，锶六铁体从1175[公式:见文]C到1250[公式:见文]C，经历了[公式:见文]-、[公式:见文]-、[公式:见文]-、[公式:见文]-相变过程，确认S-1200(1200℃煅烧[公式:见文]C)为Co 2 z型六铁体。S-1200的虚磁导率最高，而所有样品的虚介电常数均接近于零，表明六铁体对锶co2z具有优异的微波吸附性能。根据阻抗匹配和四分之一波长理论，反射损耗结果表明，S-1200在4.72 GHz时表现出最佳的微波吸收性能，在4.0 mm厚度下的RL值为−32.4 dB。
{"title":"Sol-gel synthesis, electromagnetic properties and microwave absorption behavior of strontium Co<sub>2</sub>Z hexaferrites","authors":"Z.F. Gu, Z.C. Yu, B. Hong, J.C. Xu, Y.B. Han, X.L. Peng, H.L. Ge, X.Q. Wang","doi":"10.1142/s1793604723510268","DOIUrl":"https://doi.org/10.1142/s1793604723510268","url":null,"abstract":"Owing to the special planar structure and very high resistivity, [Formula: see text]-type hexaferrites possess the high initial permeability and cut-off frequency, indicating great application potential in high-frequency devices. Strontium Co 2 Z hexaferrites (Sr 3 Co 2 Fe[Formula: see text]O[Formula: see text]) were successfully prepared by the sol–gel method and calcined at the different temperatures from 1175[Formula: see text]C to 1250[Formula: see text]C. The influence of the calcined temperatures on the microstructure, phase structures, magnetic properties and microwave absorption behavior of all samples was investigated in detail. All results indicated that strontium hexaferrites go through the [Formula: see text]-, [Formula: see text]-, [Formula: see text]-, and [Formula: see text]-phase transformation process from 1175[Formula: see text]C to 1250[Formula: see text]C, and S-1200 (calcined at 1200[Formula: see text]C) is confirmed to be Co 2 Z-type hexaferrites. S-1200 showed the highest imaginary permeability while the imaginary permittivity of all samples is close to zero, indicating the excellent microwave adsorption behavior of strontium Co 2 Z hexaferrites. The reflection loss results indicate that S-1200 exhibits the best microwave absorption performance with the RL value of − 32.4 dB for 4.0 mm thickness at 4.72 GHz, according to the impedance matching and quarter-wavelength theory.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"12 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135514408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-19DOI: 10.1142/s1793604723510256
Yicheng Zhou, Li Dong, Tongtong Cao, Haoran Wang, Jiazheng Zhang, Xiaobo Zhang, Lin Liu, Zhiwei Tong
The guest molecule trans-[2-(2,2,3,3,4,4,4-heptafluorobutylamino) ethyl]-2-[4-(4-hexanobenzazo)-phenoxy] ethyl-dimethylammonium (abbreviated as C 3 F 7 -azo[Formula: see text]Br[Formula: see text]) were inserted into the K 4 Nb 6 O[Formula: see text] laminated by the guest–guest exchange method to synthesize C 3 F 7 -azo[Formula: see text]/Nb 6 O[Formula: see text] type-A nanocomposite with excellent electrochemical properties. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform infrared (FTIR) spectrometer and energy dispersive spectroscopy (EDS) were used to characterize the structure and morphology of nanocomposite C 3 F 7 -azo[Formula: see text]/Nb 6 O[Formula: see text]. C 3 F 7 -azo[Formula: see text]ions were speculated to form bilayer between the [Nb 6 O[Formula: see text]][Formula: see text]lamellar at an angle of 51.1[Formula: see text] by morphology analysis and lamellar spacing calculation. This nanocomposite was used to fabricate an electrochemical sensor for simultaneous detection of dopamine (DA) and ascorbic acid (AA). Differential pulse voltammetry, cyclic voltammetry and electrochemical impedance spectroscopy in N 2 -saturated phosphate buffered solution (0.1 M, pH = 5) demonstrated excellent electrocatalytic activity. The sensor achieved detection limits of 1.74 [Formula: see text]M for DA and 1.57 [Formula: see text]M for AA.
{"title":"Preparation of novel azobenzene derivatives/potassium niobate nanocomposite and its application in electrochemical sensors","authors":"Yicheng Zhou, Li Dong, Tongtong Cao, Haoran Wang, Jiazheng Zhang, Xiaobo Zhang, Lin Liu, Zhiwei Tong","doi":"10.1142/s1793604723510256","DOIUrl":"https://doi.org/10.1142/s1793604723510256","url":null,"abstract":"The guest molecule trans-[2-(2,2,3,3,4,4,4-heptafluorobutylamino) ethyl]-2-[4-(4-hexanobenzazo)-phenoxy] ethyl-dimethylammonium (abbreviated as C 3 F 7 -azo[Formula: see text]Br[Formula: see text]) were inserted into the K 4 Nb 6 O[Formula: see text] laminated by the guest–guest exchange method to synthesize C 3 F 7 -azo[Formula: see text]/Nb 6 O[Formula: see text] type-A nanocomposite with excellent electrochemical properties. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform infrared (FTIR) spectrometer and energy dispersive spectroscopy (EDS) were used to characterize the structure and morphology of nanocomposite C 3 F 7 -azo[Formula: see text]/Nb 6 O[Formula: see text]. C 3 F 7 -azo[Formula: see text]ions were speculated to form bilayer between the [Nb 6 O[Formula: see text]][Formula: see text]lamellar at an angle of 51.1[Formula: see text] by morphology analysis and lamellar spacing calculation. This nanocomposite was used to fabricate an electrochemical sensor for simultaneous detection of dopamine (DA) and ascorbic acid (AA). Differential pulse voltammetry, cyclic voltammetry and electrochemical impedance spectroscopy in N 2 -saturated phosphate buffered solution (0.1 M, pH = 5) demonstrated excellent electrocatalytic activity. The sensor achieved detection limits of 1.74 [Formula: see text]M for DA and 1.57 [Formula: see text]M for AA.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135667124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, we investigated the morphology and crystallinity changes of a [Formula: see text]-ketoenamine COF, Tp-BD(Me) 2 (Tp=1,3,5-triformylphloroglucinol, BD(Me) 2 =3,3[Formula: see text]-dimethyl-[1,1[Formula: see text]-biphenyl]-4,4[Formula: see text]-diamine), with different reaction time and temperatures. Powder X-ray diffraction (PXRD) and Fourier-transform infrared (FTIR) spectra tests confirmed the synthesis of Tp-BD(Me) 2 , which has a specific [Formula: see text]-ketoenamine linkage and a probable eclipsed stacking mode. At a reaction temperature of 50[Formula: see text]C, the morphology of Tp-BD(Me) 2 underwent a progressive process of growing, extending and splitting. The band gaps of the Tp-BD(Me) 2 obtained with the reaction time of 18–24 h were calculated near 2.0 eV. The BET surface areas of the Tp-BD(Me) 2 were around 400–600 m 2 /g. It is not an optimal choice if the reaction temperature is below 50[Formula: see text]C, which could cause a low crystallinity and disordered morphology. However, slightly improving the reaction temperature to 60[Formula: see text]C is beneficial for generating high-crystallinity Tp-BD(Me) 2 .
{"title":"Synthesis and characterization of a β-ketoenamine COF Tp-BD(Me)<sub>2</sub> at mild temperatures","authors":"Shuquan Wan, Guanyu Liu, Ying Chen, Senlin Leng, Yuanyong Yao, Xinjuan Zeng, Cailong Zhou","doi":"10.1142/s1793604723500212","DOIUrl":"https://doi.org/10.1142/s1793604723500212","url":null,"abstract":"In this work, we investigated the morphology and crystallinity changes of a [Formula: see text]-ketoenamine COF, Tp-BD(Me) 2 (Tp=1,3,5-triformylphloroglucinol, BD(Me) 2 =3,3[Formula: see text]-dimethyl-[1,1[Formula: see text]-biphenyl]-4,4[Formula: see text]-diamine), with different reaction time and temperatures. Powder X-ray diffraction (PXRD) and Fourier-transform infrared (FTIR) spectra tests confirmed the synthesis of Tp-BD(Me) 2 , which has a specific [Formula: see text]-ketoenamine linkage and a probable eclipsed stacking mode. At a reaction temperature of 50[Formula: see text]C, the morphology of Tp-BD(Me) 2 underwent a progressive process of growing, extending and splitting. The band gaps of the Tp-BD(Me) 2 obtained with the reaction time of 18–24 h were calculated near 2.0 eV. The BET surface areas of the Tp-BD(Me) 2 were around 400–600 m 2 /g. It is not an optimal choice if the reaction temperature is below 50[Formula: see text]C, which could cause a low crystallinity and disordered morphology. However, slightly improving the reaction temperature to 60[Formula: see text]C is beneficial for generating high-crystallinity Tp-BD(Me) 2 .","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-17DOI: 10.1142/s1793604723500200
Cong-Cong Jiang, Dong-Xin Xu, Pei-Xin Bai, Yong-Xiang Wang, Cheng Zhang, Jun Wang, Shi-Xin Sun
A new three-dimensional Zn(II) complex named [Zn(1,3-BMIB)(TBIP)⋅2H2O] n (1) (containning 1,3-BMIB 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene, H 2 TBIP=5-tert-butyl isophthalic acid) had been prepared by hydrothermal synthesis. Systematic structural characterization, especially the single crystal X-ray diffraction method, discreetly reveal the complex 1 exhibits three-dimensional (3D) framework with CdSO 4 topology. The 3D crystrals 1 display solid-state fluorescence behavior at room temperature, indicating the potential of the candidate materials for absorbing and using visible light. The photocatalytic properties of compound 1 were estimated through the model photodecomposition dye pollutants using methylene blue (MB) and rhodamine B (RhB) under visible light irradiation.
{"title":"Synthesis, structure and property investigation of a three-dimensional Zn (II) metal–organic frameworks","authors":"Cong-Cong Jiang, Dong-Xin Xu, Pei-Xin Bai, Yong-Xiang Wang, Cheng Zhang, Jun Wang, Shi-Xin Sun","doi":"10.1142/s1793604723500200","DOIUrl":"https://doi.org/10.1142/s1793604723500200","url":null,"abstract":"A new three-dimensional Zn(II) complex named [Zn(1,3-BMIB)(TBIP)⋅2H2O] n (1) (containning 1,3-BMIB 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene, H 2 TBIP=5-tert-butyl isophthalic acid) had been prepared by hydrothermal synthesis. Systematic structural characterization, especially the single crystal X-ray diffraction method, discreetly reveal the complex 1 exhibits three-dimensional (3D) framework with CdSO 4 topology. The 3D crystrals 1 display solid-state fluorescence behavior at room temperature, indicating the potential of the candidate materials for absorbing and using visible light. The photocatalytic properties of compound 1 were estimated through the model photodecomposition dye pollutants using methylene blue (MB) and rhodamine B (RhB) under visible light irradiation.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135945128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-17DOI: 10.1142/s1793604723400313
Huinian Zhang, Suping Jia, Ning Li, Xiaolin Shi, Ziyuan Li
Single-atom catalysts (SACs), especially atomically dispersed Fe–N[Formula: see text]–C based SACs, hold great promise to replace Pt-based electrocatalysts for oxygen-reduction reaction (ORR). Currently, synthesizing high-activity ORR electrocatalysts with atomically dispersed Fe–N[Formula: see text] site structures is still challenging due to their high surface free energy, which leads to easy migration and serious aggregation. Herein, we have designed a general graphene quantum dots (GQDs)-anchoring strategy to synthesize a single-iron-atom electrocatalyst (Fe–N-GQDs/PC) applied to ORR through calcining of N-GQDs-Fe[Formula: see text] modified porous carbon (PC) and melamine. Experiments demonstrate the N-GQDs consist of abundant oxygenated groups, which could lead to complexing metal ions and thus facilitating the formation of SACs. Furthermore, the Fe–N-GQDs/PC electrocatalyst exhibits outstanding electrocatalytic ORR activity in 0.1 M KOH media with half-wave potentials of 0.84 versus 0.85 V for Pt/C. This strategy has opened up new feasible ideas to produce SACs for electrochemical energy devices.
单原子催化剂(SACs)，尤其是原子分散的Fe-N -C基SACs，在氧还原反应(ORR)中有望取代pt基电催化剂。目前，具有原子分散Fe-N[公式:见本文]位结构的高活性ORR电催化剂由于其表面自由能高，容易迁移，聚集严重，仍然具有挑战性。在此，我们设计了一种通用石墨烯量子点(GQDs)锚定策略，通过煅烧N-GQDs-Fe修饰的多孔碳(PC)和三聚氰胺来合成一种应用于ORR的单铁原子电催化剂(Fe-N-GQDs /PC)。实验表明，N-GQDs含有丰富的氧合基团，可以使金属离子络合，从而促进SACs的形成。此外，Fe-N-GQDs /PC电催化剂在0.1 M KOH介质中表现出出色的电催化ORR活性，Pt/C的半波电位为0.84 V，而Pt/C的半波电位为0.85 V。这一策略为生产电化学能源装置用sac开辟了新的可行思路。
{"title":"Facile graphene quantum dot-anchoring strategy synthesis of single-atom iron-nitrogen electrocatalyst with enhanced ORR performance","authors":"Huinian Zhang, Suping Jia, Ning Li, Xiaolin Shi, Ziyuan Li","doi":"10.1142/s1793604723400313","DOIUrl":"https://doi.org/10.1142/s1793604723400313","url":null,"abstract":"Single-atom catalysts (SACs), especially atomically dispersed Fe–N[Formula: see text]–C based SACs, hold great promise to replace Pt-based electrocatalysts for oxygen-reduction reaction (ORR). Currently, synthesizing high-activity ORR electrocatalysts with atomically dispersed Fe–N[Formula: see text] site structures is still challenging due to their high surface free energy, which leads to easy migration and serious aggregation. Herein, we have designed a general graphene quantum dots (GQDs)-anchoring strategy to synthesize a single-iron-atom electrocatalyst (Fe–N-GQDs/PC) applied to ORR through calcining of N-GQDs-Fe[Formula: see text] modified porous carbon (PC) and melamine. Experiments demonstrate the N-GQDs consist of abundant oxygenated groups, which could lead to complexing metal ions and thus facilitating the formation of SACs. Furthermore, the Fe–N-GQDs/PC electrocatalyst exhibits outstanding electrocatalytic ORR activity in 0.1 M KOH media with half-wave potentials of 0.84 versus 0.85 V for Pt/C. This strategy has opened up new feasible ideas to produce SACs for electrochemical energy devices.","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135944437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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