Pub Date : 2024-07-31DOI: 10.1557/s43578-024-01397-3
Meixiang Wang, Michael D. Dickey
This perspective—which arose from the “Distinguished Invited Speaker” series at the Materials Research Society Spring 2024 meeting—highlights five recent papers about ionogels. The title “Five-for-Five” refers to the dedication of a figure for each of the five papers. Ionogels are crosslinked polymer networks swollen with ionic liquids. Ionic liquids are interesting because they have ionic conductivity, negligible vapor pressure, high thermal and electrochemical stability. There are also many different ionic liquids to chose from. Thus, as we highlight here, it is possible to vary the concentration and composition of ionogels to make materials that are: (1) hydrophobic, (2) highly adhesive, (3) tough, (4) glassy, or (5) 3D printable. We hope this article will clearly illustrate several unique and tunable properties that are possible with ionogels while inspiring future research and applications of these remarkable materials.
{"title":"Five-for-five: Highlights from five recent noteworthy papers on ionogels","authors":"Meixiang Wang, Michael D. Dickey","doi":"10.1557/s43578-024-01397-3","DOIUrl":"https://doi.org/10.1557/s43578-024-01397-3","url":null,"abstract":"<p>This perspective—which arose from the “Distinguished Invited Speaker” series at the Materials Research Society Spring 2024 meeting—highlights five recent papers about ionogels. The title “Five-for-Five” refers to the dedication of a figure for each of the five papers. Ionogels are crosslinked polymer networks swollen with ionic liquids. Ionic liquids are interesting because they have ionic conductivity, negligible vapor pressure, high thermal and electrochemical stability. There are also many different ionic liquids to chose from. Thus, as we highlight here, it is possible to vary the concentration and composition of ionogels to make materials that are: (1) hydrophobic, (2) highly adhesive, (3) tough, (4) glassy, or (5) 3D printable. We hope this article will clearly illustrate several unique and tunable properties that are possible with ionogels while inspiring future research and applications of these remarkable materials.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"184 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870622","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 : 2024-07-26DOI: 10.1557/s43578-024-01394-6
Monika Lohchab, Sunil Rohilla, S. K. Chaudhary, Jyoti Saini
In present work polycrystalline Bi1−xNdxFeO3 (X = 0.05 to 0.20 at step of 0.05) is synthesized by solid-state reaction method. Present study focuses on effect of temperature, frequency and concentration of Neodymium on BiFeO3 structural, dielectric, magnetic and ferroelectric properties. Crystalline nature of samples confirmed by XRD. Rietveld refinement of XRD data for Bi1−xNdxFeO3 shows structural transition for X = 0.20. Dielectric study shows very high value of dielectric constant i.e. (105) and shows improvement in values of dielectric constant with increasing Nd amount and observed very low value (less than 20) for dielectric loss for all the samples. Magnetic study shows low value for Retentivity and maximum for X = 0.15 (0.0386emu/gm). Performed ferroelectric analysis shows that Pr has declining nature with increasing Nd concentration for all frequencies and minimum value of Pr is obtained for X = 0.15. All the properties like dielectric, magnetic and ferroelectric shows a transition in regular trend for X = 0.20.
{"title":"Investigating the structural, electrical, and magnetic characteristics of Nd-doped BiFeO3 synthesized via the solid-state reaction method","authors":"Monika Lohchab, Sunil Rohilla, S. K. Chaudhary, Jyoti Saini","doi":"10.1557/s43578-024-01394-6","DOIUrl":"https://doi.org/10.1557/s43578-024-01394-6","url":null,"abstract":"<p>In present work polycrystalline Bi<sub>1−<i>x</i></sub>Nd<sub><i>x</i></sub>FeO<sub>3</sub> (<i>X</i> = 0.05 to 0.20 at step of 0.05) is synthesized by solid-state reaction method. Present study focuses on effect of temperature, frequency and concentration of Neodymium on BiFeO<sub>3</sub> structural, dielectric, magnetic and ferroelectric properties. Crystalline nature of samples confirmed by XRD. Rietveld refinement of XRD data for Bi<sub>1−<i>x</i></sub>Nd<sub><i>x</i></sub>FeO<sub>3</sub> shows structural transition for <i>X</i> = 0.20. Dielectric study shows very high value of dielectric constant i.e. (10<sup>5</sup>) and shows improvement in values of dielectric constant with increasing Nd amount and observed very low value (less than 20) for dielectric loss for all the samples. Magnetic study shows low value for Retentivity and maximum for <i>X</i> = 0.15 (0.0386emu/gm). Performed ferroelectric analysis shows that <i>P</i><sub>r</sub> has declining nature with increasing Nd concentration for all frequencies and minimum value of <i>P</i><sub>r</sub> is obtained for <i>X</i> = 0.15. All the properties like dielectric, magnetic and ferroelectric shows a transition in regular trend for <i>X</i> = 0.20.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"44 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780863","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 : 2024-07-25DOI: 10.1557/s43578-024-01399-1
Soumya Ranjan Guru, Mihir Sarangi
Multi-cycle micro-indentation tests were conducted on three polymers: Poly-ether-ether-ketone (PEEK), Poly (methyl methacrylate) (PMMA), and Poly (tetra-fluoroethylene) (PTFE). The load–displacement curve obtained from the indentation technique was used to evaluate the mechanical properties of these polymers. This study employed multi-cyclic indentation to establish a polymer fatigue model utilizing the indentation load–displacement curve. Currently, researchers are investigating fatigue life studies using stress- and energy-based approaches. Two empirical models for each approach were developed using the least-square curve-fitting method in this study. A simulation model based on finite element analysis has been utilized to verify the accuracy of these fatigue models for Vickers indentation. During the validation process, both models had a maximum error value of 2% compared to the experimental data, indicating a strong agreement with the simulation results. The generated models can evaluate polymer fatigue using non-destructive methodology.
{"title":"Development of empirical models for estimation polymer indentation fatigue and validation with finite element simulation models","authors":"Soumya Ranjan Guru, Mihir Sarangi","doi":"10.1557/s43578-024-01399-1","DOIUrl":"https://doi.org/10.1557/s43578-024-01399-1","url":null,"abstract":"<p>Multi-cycle micro-indentation tests were conducted on three polymers: Poly-ether-ether-ketone (PEEK), Poly (methyl methacrylate) (PMMA), and Poly (tetra-fluoroethylene) (PTFE). The load–displacement curve obtained from the indentation technique was used to evaluate the mechanical properties of these polymers. This study employed multi-cyclic indentation to establish a polymer fatigue model utilizing the indentation load–displacement curve. Currently, researchers are investigating fatigue life studies using stress- and energy-based approaches. Two empirical models for each approach were developed using the least-square curve-fitting method in this study. A simulation model based on finite element analysis has been utilized to verify the accuracy of these fatigue models for Vickers indentation. During the validation process, both models had a maximum error value of 2% compared to the experimental data, indicating a strong agreement with the simulation results. The generated models can evaluate polymer fatigue using non-destructive methodology.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"11 4 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780862","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 : 2024-07-22DOI: 10.1557/s43578-024-01396-4
Z. Baharlouei, M. H. Enayati, S. M. Nahvi
Magnetic particle testing is one of the popular methods to detect very small surface or near-surface defects in engineering parts. Successful defect detection depends on the physical properties of the particles. This work aims to synthesize cobalt ferrite-fluorescent polymer particles to detect finer defects located in deeper places. For this purpose, cobalt ferrite (CoFe2O4) nanoparticles were synthesized and the next step, fluorescence pigment was incorporated into CoFe2O4 nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), vibration magnetometer (VSM), and Fourier transform infrared spectroscope (FTIR) were used to examine the effects of various parameters. CoFe2O4 nanoparticles with a size of about 55 nm and suitable magnetic properties were chosen. The presence of pigment reduced the saturation magnetization to 25.17 emu/g, although this value is still within the suitable range. Finally, the stability of the pigment on CoFe2O4 nanoparticles in water was investigated, and synthesized nanocomposite was successfully used to reveal defects.
{"title":"Fluorescent cobalt ferrite nanoparticles for non-destructive magnetic particle testing","authors":"Z. Baharlouei, M. H. Enayati, S. M. Nahvi","doi":"10.1557/s43578-024-01396-4","DOIUrl":"https://doi.org/10.1557/s43578-024-01396-4","url":null,"abstract":"<p>Magnetic particle testing is one of the popular methods to detect very small surface or near-surface defects in engineering parts. Successful defect detection depends on the physical properties of the particles. This work aims to synthesize cobalt ferrite-fluorescent polymer particles to detect finer defects located in deeper places. For this purpose, cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>) nanoparticles were synthesized and the next step, fluorescence pigment was incorporated into CoFe<sub>2</sub>O<sub>4</sub> nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), vibration magnetometer (VSM), and Fourier transform infrared spectroscope (FTIR) were used to examine the effects of various parameters. CoFe<sub>2</sub>O<sub>4</sub> nanoparticles with a size of about 55 nm and suitable magnetic properties were chosen. The presence of pigment reduced the saturation magnetization to 25.17 emu/g, although this value is still within the suitable range. Finally, the stability of the pigment on CoFe<sub>2</sub>O<sub>4</sub> nanoparticles in water was investigated, and synthesized nanocomposite was successfully used to reveal defects.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"63 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780864","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 : 2024-07-22DOI: 10.1557/s43578-024-01372-y
Chandrima Goswami, Asha Bhardwaj
Highly stable and bright emitting CsBr-Cs4PbBr6-CsPbBr3 perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr3) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs4PbBr6-CsPbBr3 mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs4PbBr6-CsPbBr3 mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.
{"title":"Emergence of multi-peak emission in CsBr-Cs4PbBr6-CsPbBr3 nanocrystals at room temperature","authors":"Chandrima Goswami, Asha Bhardwaj","doi":"10.1557/s43578-024-01372-y","DOIUrl":"https://doi.org/10.1557/s43578-024-01372-y","url":null,"abstract":"<p>Highly stable and bright emitting CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr<sub>3</sub>) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"37 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780866","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 : 2024-07-22DOI: 10.1557/s43578-024-01390-w
Ravi Ranjan Kumar, Randhir Kumar Singh, Varsha Florist, Namit Pai, C. R. Anoop, Debasis Tripathy, S. V. S. Narayana Murty
The hot workability of Ni–25Cr–14W alloy is studied through isothermal hot compression tests in the temperature (T) range of 1000–1200 °C and in the strain rates(ε̇) of 0.001–10 s−1 in a thermomechanical simulator. Flow stress data show stable flow curves at T > 1050 °C and ε̇ < 0.1 s−1. The values of flow stress decrease with increase in T or decrease in ε̇. Based on processing map, safe region for hot workability has been identified in the temperature range of 1000–1200 °C and ε̇ of 0.001–0.1 s−1 with maximum efficiency(η) of ~ 44% at 1175 °C and 0.001 s−1. Dynamic recrystallization has been identified as the softening mechanism operating in the material at high temperature and lower ε̇. Incomplete recrystallization of the microstructures was noted during multi-step forging by varying T or ε̇, indicating the importance of maintaining the same during industrial processing.
{"title":"Effect of temperature and strain rate on the hot workability behaviour of Ni–25Cr–14W superalloy: An approach using processing map and constitutive equation","authors":"Ravi Ranjan Kumar, Randhir Kumar Singh, Varsha Florist, Namit Pai, C. R. Anoop, Debasis Tripathy, S. V. S. Narayana Murty","doi":"10.1557/s43578-024-01390-w","DOIUrl":"https://doi.org/10.1557/s43578-024-01390-w","url":null,"abstract":"<p>The hot workability of Ni–25Cr–14W alloy is studied through isothermal hot compression tests in the temperature (T) range of 1000–1200 °C and in the strain rates(ε̇) of 0.001–10 s<sup>−1</sup> in a thermomechanical simulator. Flow stress data show stable flow curves at T > 1050 °C and ε̇ < 0.1 s<sup>−1</sup>. The values of flow stress decrease with increase in T or decrease in ε̇. Based on processing map, safe region for hot workability has been identified in the temperature range of 1000–1200 °C and ε̇ of 0.001–0.1 s<sup>−1</sup> with maximum efficiency(<i>η</i>) of ~ 44% at 1175 °C and 0.001 s<sup>−1</sup>. Dynamic recrystallization has been identified as the softening mechanism operating in the material at high temperature and lower ε̇. Incomplete recrystallization of the microstructures was noted during multi-step forging by varying T or ε̇, indicating the importance of maintaining the same during industrial processing.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"70 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780865","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 : 2024-07-17DOI: 10.1557/s43578-024-01395-5
H. Iwane, G. Saito, S. Muto, K. Ueda
Diamond/graphene (carbon sp3-sp2) interfaces exhibit various interesting and potentially useful electronic phenomena. The present work demonstrates the possibility of obtaining novel neuromorphic photodevices using such junctions. Junctions were found to show different photoconductivity relaxation behavior depending on their growth conditions such that various optoelectronic properties were observed. In particular, interfaces exhibiting shorter relaxation times could be used to construct image recognition devices mimicking short-term memory functions of the human brain. Using these devices, images of the hand-written numerals 0 through 9 could be optoelectronically recognized with an accuracy on the order of 80%, demonstrating both photo-detection and processing functions in a single device. These results suggest that novel image processing devices could be produced using graphene/diamond heterojunctions.
{"title":"Diamond/graphene (carbon sp3-sp2) heterojunctions for neuromorphic device applications","authors":"H. Iwane, G. Saito, S. Muto, K. Ueda","doi":"10.1557/s43578-024-01395-5","DOIUrl":"https://doi.org/10.1557/s43578-024-01395-5","url":null,"abstract":"<p>Diamond/graphene (carbon sp<sup>3</sup>-sp<sup>2</sup>) interfaces exhibit various interesting and potentially useful electronic phenomena. The present work demonstrates the possibility of obtaining novel neuromorphic photodevices using such junctions. Junctions were found to show different photoconductivity relaxation behavior depending on their growth conditions such that various optoelectronic properties were observed. In particular, interfaces exhibiting shorter relaxation times could be used to construct image recognition devices mimicking short-term memory functions of the human brain. Using these devices, images of the hand-written numerals 0 through 9 could be optoelectronically recognized with an accuracy on the order of 80%, demonstrating both photo-detection and processing functions in a single device. These results suggest that novel image processing devices could be produced using graphene/diamond heterojunctions.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"36 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740455","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 : 2024-07-10DOI: 10.1557/s43578-024-01388-4
Wenting Shen, Jiaxin Du, Xiangyu Mei, Su Liu, Fujian Liu, Yinsong Si
Graphitic carbon nitride (g-C3N4), owing to its unique structure, has emerged as a hotspot in the semiconductor photocatalytic hydrogen production. However, the intrinsic poor crystallinity of g-C3N4, which leads to poor hydrogen production efficiency, remains a significant drawback. This study introduces a novel approach for synthesizing highly crystallized g-C3N4 by optimizing precursor mass and employing a fixed temperature polymerization technique. Our research focuses on the intermediate stage polymerization at 220 °C using varying masses of dicyandiamide (DCY) precursors. The results indicate that an increase in the mass of the DCY precursor leads to g-C3N4 with a more regular microstructure and enhanced crystallinity. The photocatalytic hydrogen production rate of this g-C3N4 reached up to 3779 μmol·h−1·g−1, which is five times that of the original g-C3N4.This research holds significant implications for improving the photocatalytic hydrogen production performance of intrinsic g-C3N4.
{"title":"Fixed temperature polymerization during intermediate stage to synthesize highly crystallized g-C3N4 for photocatalytic hydrogen production","authors":"Wenting Shen, Jiaxin Du, Xiangyu Mei, Su Liu, Fujian Liu, Yinsong Si","doi":"10.1557/s43578-024-01388-4","DOIUrl":"https://doi.org/10.1557/s43578-024-01388-4","url":null,"abstract":"<p>Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), owing to its unique structure, has emerged as a hotspot in the semiconductor photocatalytic hydrogen production. However, the intrinsic poor crystallinity of g-C<sub>3</sub>N<sub>4</sub>, which leads to poor hydrogen production efficiency, remains a significant drawback. This study introduces a novel approach for synthesizing highly crystallized g-C<sub>3</sub>N<sub>4</sub> by optimizing precursor mass and employing a fixed temperature polymerization technique. Our research focuses on the intermediate stage polymerization at 220 °C using varying masses of dicyandiamide (DCY) precursors. The results indicate that an increase in the mass of the DCY precursor leads to g-C<sub>3</sub>N<sub>4</sub> with a more regular microstructure and enhanced crystallinity. The photocatalytic hydrogen production rate of this g-C<sub>3</sub>N<sub>4</sub> reached up to 3779 μmol·h<sup>−1</sup>·g<sup>−1</sup>, which is five times that of the original g-C<sub>3</sub>N<sub>4</sub>.This research holds significant implications for improving the photocatalytic hydrogen production performance of intrinsic g-C<sub>3</sub>N<sub>4</sub>.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587688","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}
This paper describes a novel approach the development of biocompatible polyvinyl chloride (PVC) and polyurethane (PU) polymers, modified with copper (II) ions followed by the immobilisation the thrombin inhibitor argatroban (AG) using dopamine chemistry. The surface loading of the immobilised AG was 6.06 µg cm−2 on PVC and 6.66 µg cm−2 on PU, confirmed by FTIR and inhibitor concentration measurements. Both AG/Cu-modified polymers produced NO by catalytically decomposing S-nitrosothiol, reaching NO levels in plasma of 0.59 × 10–10(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) for AG/Cu-PVC and 0.51 × 10–10(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) for AG/Cu-PU, matching endothelial cell-produced physiological levels. This modification improved the haemocompatibility of the polymers through thrombin inhibition and reduced platelet aggregation and adhesion. Additionally, both modified polymers inhibited Staphylococcus aureus adhesion, growth and viability, confirming their acquired antibacterial properties. Antibacterial activity against Escherichia coli was also observed. These results demonstrate that modifying PVC and PU surfaces with copper (II) and AG produced materials with dual antithrombotic and antibacterial functions.
Graphical abstract
本文介绍了一种新方法，即开发生物相容性聚氯乙烯（PVC）和聚氨酯（PU）聚合物，用铜（II）离子修饰，然后用多巴胺化学法固定凝血酶抑制剂阿加曲班（AG）。经傅立叶变换红外光谱和抑制剂浓度测量证实，固定 AG 的表面负载量在 PVC 上为 6.06 µg cm-2，在 PU 上为 6.66 µg cm-2。两种 AG/Cu 改性聚合物都能通过催化分解 S-亚硝基硫醇产生 NO，血浆中的 NO 含量分别为：AG/Cu-PVC 0.59 × 10-10 （text{mol}，{text{cm}}^{-2} ，{text{min}}^{-1}），PU 0.51 × 10-10 （text{min}}^{-1}）。51 × 10-10 (text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) ，符合内皮细胞产生的生理水平。这种改性通过抑制凝血酶改善了聚合物的血液相容性，并降低了血小板的聚集和粘附。此外，这两种改性聚合物都能抑制金黄色葡萄球菌的粘附、生长和存活，证实了它们的抗菌特性。还观察到了对大肠杆菌的抗菌活性。这些结果表明，用铜（II）和 AG 对聚氯乙烯和聚氨酯表面进行改性，可制成具有抗血栓和抗菌双重功能的材料。
{"title":"Argatroban- and copper-modified polymers with improved thromboresistance and antimicrobial properties","authors":"Liana Azizova, Volodymyr Chernyshenko, Daria Korolova, Iain U. Allan, Sergey Mikhalovsky, Lyuba Mikhalovska","doi":"10.1557/s43578-024-01389-3","DOIUrl":"https://doi.org/10.1557/s43578-024-01389-3","url":null,"abstract":"<p>This paper describes a novel approach the development of biocompatible polyvinyl chloride (PVC) and polyurethane (PU) polymers, modified with copper (II) ions followed by the immobilisation the thrombin inhibitor argatroban (AG) using dopamine chemistry. The surface loading of the immobilised AG was 6.06 µg cm<sup>−2</sup> on PVC and 6.66 µg cm<sup>−2</sup> on PU, confirmed by FTIR and inhibitor concentration measurements. Both AG/Cu-modified polymers produced NO by catalytically decomposing S-nitrosothiol, reaching NO levels in plasma of 0.59 × 10<sup>–10</sup> <span>(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1})</span> for AG/Cu-PVC and 0.51 × 10<sup>–10</sup> <span>(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1})</span> for AG/Cu-PU, matching endothelial cell-produced physiological levels. This modification improved the haemocompatibility of the polymers through thrombin inhibition and reduced platelet aggregation and adhesion. Additionally, both modified polymers inhibited <i>Staphylococcus aureus</i> adhesion, growth and viability, confirming their acquired antibacterial properties. Antibacterial activity against <i>Escherichia coli</i> was also observed. These results demonstrate that modifying PVC and PU surfaces with copper (II) and AG produced materials with dual antithrombotic and antibacterial functions.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569982","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 : 2024-07-09DOI: 10.1557/s43578-024-01380-y
Mohammad Raziul Haque, Md Masud Rana, Naznin Akhtar, Mohammad Shahedur Rahman, S. M. Asaduzzaman
Hydroxyapatite is widely used as a biomaterial filler to promote maxillofacial bone regeneration. Bacterial infections pose a common challenge to maxillofacial bone tissue regeneration; thus, incorporating antibacterial properties into hydroxyapatite-based scaffolds is essential. This study aimed to develop composite scaffolds for maxillofacial reconstruction by incorporating silver and iron nanoparticles into hydroxyapatite-polymer composites. A thermally induced phase separation method was employed to fabricate scaffolds with hydroxyapatite, collagen, and chitosan. Various characterization techniques, including porosity and density measurements, swelling ability analysis, biodegradability, FTIR, XRD, and SEM analysis, were utilized. The incorporation of silver and iron nanoparticles enhanced antibacterial properties and promoted bone growth. The scaffolds demonstrated efficacy against bacteria in antimicrobial assays. Cytotoxicity and blood biocompatibility analysis confirmed their compatibility with cells, and in vivo studies in a rabbit mandibular defect model demonstrated successful bone restoration. These findings may have significant implications for craniofacial tissue regeneration, particularly in non-load-bearing bone defects.
{"title":"Development of nanoparticle doped hydroxyapatite-based composite scaffolds for maxillofacial reconstruction","authors":"Mohammad Raziul Haque, Md Masud Rana, Naznin Akhtar, Mohammad Shahedur Rahman, S. M. Asaduzzaman","doi":"10.1557/s43578-024-01380-y","DOIUrl":"https://doi.org/10.1557/s43578-024-01380-y","url":null,"abstract":"<p>Hydroxyapatite is widely used as a biomaterial filler to promote maxillofacial bone regeneration. Bacterial infections pose a common challenge to maxillofacial bone tissue regeneration; thus, incorporating antibacterial properties into hydroxyapatite-based scaffolds is essential. This study aimed to develop composite scaffolds for maxillofacial reconstruction by incorporating silver and iron nanoparticles into hydroxyapatite-polymer composites. A thermally induced phase separation method was employed to fabricate scaffolds with hydroxyapatite, collagen, and chitosan. Various characterization techniques, including porosity and density measurements, swelling ability analysis, biodegradability, FTIR, XRD, and SEM analysis, were utilized. The incorporation of silver and iron nanoparticles enhanced antibacterial properties and promoted bone growth. The scaffolds demonstrated efficacy against bacteria in antimicrobial assays. Cytotoxicity and blood biocompatibility analysis confirmed their compatibility with cells, and in vivo studies in a rabbit mandibular defect model demonstrated successful bone restoration. These findings may have significant implications for craniofacial tissue regeneration, particularly in non-load-bearing bone defects.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"83 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569986","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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