In contemporary times, bacteria and their escalating antibiotic resistance present a formidable global menace, rendering conventional antibiotic therapies futile. This phenomenon not only complicates the management of infectious diseases but also exacerbates healthcare expenditures, potentially culminating in grave ramifications. This review delves into the intricate realm of the antibacterial mechanism and biomedical utility of emerging nanoscale piezoelectric antibiotics. It commences by elucidating the distinctive piezoelectric effect inherent in nanomaterials. Subsequently, it meticulously categorizes piezoelectric nanomaterials into discrete classifications, encompassing single-crystal, polycrystalline, transition metal dichalcogenides (TMDCs), polymer, and composite iterations.
{"title":"Piezoelectric nanomaterials for antibacterial strategies","authors":"Xiebingqing Yang, Zhuoren Yang, Xuesong Wang, Yahui Guo, Yunfei Xie, Weirong Yao, Hideya Kawasaki","doi":"10.1016/j.apmt.2024.102419","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102419","url":null,"abstract":"In contemporary times, bacteria and their escalating antibiotic resistance present a formidable global menace, rendering conventional antibiotic therapies futile. This phenomenon not only complicates the management of infectious diseases but also exacerbates healthcare expenditures, potentially culminating in grave ramifications. This review delves into the intricate realm of the antibacterial mechanism and biomedical utility of emerging nanoscale piezoelectric antibiotics. It commences by elucidating the distinctive piezoelectric effect inherent in nanomaterials. Subsequently, it meticulously categorizes piezoelectric nanomaterials into discrete classifications, encompassing single-crystal, polycrystalline, transition metal dichalcogenides (TMDCs), polymer, and composite iterations.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"102 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-07DOI: 10.1016/j.apmt.2024.102421
Zhuzhu Du, Xin Chen, Ying Zhao, Yuhang Liu, Wei Ai
Graphene-based materials have been explored as hosts for Li metal anodes, but their high interfacial activity and short diffusion distances frequently result in dendrite formation on the surface. Herein, we utilize the adjustable conductivity and Li affinity of graphene oxide (GO) to develop a Janus structure comprising a top GO layer and a bottom reduced graphene oxide (rGO) layer. The progressive conductivity and lithiophilicity gradient structure of GO/rGO enables a bottom-up Li deposition mode, rendering an average Coulombic efficiency of 99.1 % over 350 cycles at 1 mA cm and 1 mAh cm. Full cells equipped with a LiFePO cathode maintain a capacity retention of 85 % after 350 cycles at 1 C. This innovative approach provides fresh insights into the development of graphene-based hosts, offering significant potential for future Li metal battery applications.
人们一直在探索将石墨烯基材料作为锂金属阳极的宿主，但它们的高界面活性和短扩散距离经常导致表面形成枝晶。在这里，我们利用氧化石墨烯（GO）可调节的导电性和锂亲和性，开发了一种由顶部 GO 层和底部还原氧化石墨烯（rGO）层组成的 "杰纳斯 "结构。GO/rGO 的渐进电导率和亲锂梯度结构实现了自下而上的锂沉积模式，在 1 mA cm 和 1 mAh cm 条件下循环 350 次后，平均库仑效率达到 99.1%。这种创新方法为石墨烯基宿主的开发提供了新的视角，为未来锂金属电池的应用提供了巨大潜力。
{"title":"Janus-structured graphene scaffold for bottom-up lithium deposition: A progressive gradient approach","authors":"Zhuzhu Du, Xin Chen, Ying Zhao, Yuhang Liu, Wei Ai","doi":"10.1016/j.apmt.2024.102421","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102421","url":null,"abstract":"Graphene-based materials have been explored as hosts for Li metal anodes, but their high interfacial activity and short diffusion distances frequently result in dendrite formation on the surface. Herein, we utilize the adjustable conductivity and Li affinity of graphene oxide (GO) to develop a Janus structure comprising a top GO layer and a bottom reduced graphene oxide (rGO) layer. The progressive conductivity and lithiophilicity gradient structure of GO/rGO enables a bottom-up Li deposition mode, rendering an average Coulombic efficiency of 99.1 % over 350 cycles at 1 mA cm and 1 mAh cm. Full cells equipped with a LiFePO cathode maintain a capacity retention of 85 % after 350 cycles at 1 C. This innovative approach provides fresh insights into the development of graphene-based hosts, offering significant potential for future Li metal battery applications.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"13 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-05DOI: 10.1016/j.apmt.2024.102411
Hongtao Zhu, Han Lu, Junhuang Xu, Xuejun Lai, Hongqiang Li, Xingrong Zeng, Xiangrong Wu, Hong Liu
With the rapid development of flexible electronics, the functional elastomer with excellent mechanical properties as substrate for the preparation of high-performance piezoresistive pressure sensor has become one of the frontier research hotspots. Here, a tough and self-healing linear polydimethylsiloxane (PDMS) elastomer with multiple hydrogen-bonding interactions was synthesized, and then utilized as substrate to prepare piezoresistive pressure sensor with 2-ureido-4[1H]-pyrimidinone modified carbon nanotubes (UPy-CNTs) as conductive material and salt particles as sacrificial template to construct electrical pathways and ridge-like microstructure, respectively. The obtained elastomer showed high transmittance of above 90 % and excellent mechanical properties with tensile strength of 4.23 MPa, elongation at break of 984 % and toughness of 24.83 MJ m. With the exchange and reconstruction of multiple hydrogen bonds, the elastomer achieved high healing efficiency of 99.1 % after healing at 80 °C for 24 h. In addition, the elastomer-based piezoresistive pressure sensor exhibited high sensitivity of 2.04 kPa, wide sensing range of 0–450 kPa, short response/recovery time of 80/100 ms and excellent sensing repeatability (8000 loading-unloading cycles). The sensor was successfully applied for detecting various human motions, including finger and knee bending, exhalation, swallowing and heart-pulse, and realized remote transmission of pressure signals with a wireless monitoring circuit. Furthermore, the sensor could restore its sensing function even after being cut into two halves, showing great potential in the fields of wearable device, health monitoring and electronic skin.
{"title":"Tough and self-healing linear polydimethylsiloxane elastomer with multiple hydrogen bonds for high-performance piezoresistive pressure sensor","authors":"Hongtao Zhu, Han Lu, Junhuang Xu, Xuejun Lai, Hongqiang Li, Xingrong Zeng, Xiangrong Wu, Hong Liu","doi":"10.1016/j.apmt.2024.102411","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102411","url":null,"abstract":"With the rapid development of flexible electronics, the functional elastomer with excellent mechanical properties as substrate for the preparation of high-performance piezoresistive pressure sensor has become one of the frontier research hotspots. Here, a tough and self-healing linear polydimethylsiloxane (PDMS) elastomer with multiple hydrogen-bonding interactions was synthesized, and then utilized as substrate to prepare piezoresistive pressure sensor with 2-ureido-4[1H]-pyrimidinone modified carbon nanotubes (UPy-CNTs) as conductive material and salt particles as sacrificial template to construct electrical pathways and ridge-like microstructure, respectively. The obtained elastomer showed high transmittance of above 90 % and excellent mechanical properties with tensile strength of 4.23 MPa, elongation at break of 984 % and toughness of 24.83 MJ m. With the exchange and reconstruction of multiple hydrogen bonds, the elastomer achieved high healing efficiency of 99.1 % after healing at 80 °C for 24 h. In addition, the elastomer-based piezoresistive pressure sensor exhibited high sensitivity of 2.04 kPa, wide sensing range of 0–450 kPa, short response/recovery time of 80/100 ms and excellent sensing repeatability (8000 loading-unloading cycles). The sensor was successfully applied for detecting various human motions, including finger and knee bending, exhalation, swallowing and heart-pulse, and realized remote transmission of pressure signals with a wireless monitoring circuit. Furthermore, the sensor could restore its sensing function even after being cut into two halves, showing great potential in the fields of wearable device, health monitoring and electronic skin.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"10 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid-state lithium-ion batteries using polymer electrolytes are viewed as a promising approach for the next generation of high-energy-density and safe solid-state batteries. Still, solid polymer electrolytes (SPEs) face real-world application challenges due to poor room temperature performance, inadequate stability, interface contact issues, and low mechanical strength. Herein, we present a novel crosslinked polytetrahydrofuran-based solid-state electrolyte (aPTHF*) with the varying ratios of lithium bis(trifluoromethanesulfonyl)imide salt (LiTFSI), fabricated via UV-photocrosslinking process. To enhance mechanical and chemical stability, aPTHF-based SPE formulations (aPEP) were also produced by incorporating poly(ethylene glycol) diacrylate (PEGDA) and trimethylolpropane ethoxylate triacrylate (ETPTA) oligomers into the structure. The designed unique structure facilitated ion migration, and the highest value of ionic conductivity was 3.16 × 10 S·cm at 80 °C for aPEP4 formulation. Fabricated SPEs demonstrated high mechanical strength with a tensile strength of 13 MPa and a broad electrochemical stability window of around 5 V which allowed good interfacial stability with the LFP electrode, showing cycling stability at C/10 in an all-solid-state battery. Moreover, Li|aPEP4|LFP pouch cells were assembled, and the flexible cell and remained functional even after being bent and folded over 20 times. The flexible electrolyte demonstrated in this research offers a promising system for future studies on all-solid-state batteries.
{"title":"Crosslinked polytetrahydrofuran-based solid-state electrolytes with improved mechanical stability and electrochemical performance","authors":"Elmira Nurgaziyeva, Almagul Mentbayeva, Zhumabay Bakenov, Sandugash Kalybekkyzy","doi":"10.1016/j.apmt.2024.102417","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102417","url":null,"abstract":"Solid-state lithium-ion batteries using polymer electrolytes are viewed as a promising approach for the next generation of high-energy-density and safe solid-state batteries. Still, solid polymer electrolytes (SPEs) face real-world application challenges due to poor room temperature performance, inadequate stability, interface contact issues, and low mechanical strength. Herein, we present a novel crosslinked polytetrahydrofuran-based solid-state electrolyte (aPTHF*) with the varying ratios of lithium bis(trifluoromethanesulfonyl)imide salt (LiTFSI), fabricated via UV-photocrosslinking process. To enhance mechanical and chemical stability, aPTHF-based SPE formulations (aPEP) were also produced by incorporating poly(ethylene glycol) diacrylate (PEGDA) and trimethylolpropane ethoxylate triacrylate (ETPTA) oligomers into the structure. The designed unique structure facilitated ion migration, and the highest value of ionic conductivity was 3.16 × 10 S·cm at 80 °C for aPEP4 formulation. Fabricated SPEs demonstrated high mechanical strength with a tensile strength of 13 MPa and a broad electrochemical stability window of around 5 V which allowed good interfacial stability with the LFP electrode, showing cycling stability at C/10 in an all-solid-state battery. Moreover, Li|aPEP4|LFP pouch cells were assembled, and the flexible cell and remained functional even after being bent and folded over 20 times. The flexible electrolyte demonstrated in this research offers a promising system for future studies on all-solid-state batteries.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"8 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For the intelligent 4D-printed actuators, the excellent performance, including quickly reversible spatial-shape transformation and locking, digital and precise shape manipulation in real-time, and remote actuation in special spaces or harsh environments, is significantly desirable but still challenging. Here, using a UV-curable system containing the shape memory polymer (SMP) and NdFeB particles, namely the magSMP composite, we fabricate a real-time reprogrammable soft actuator high-resolution Digital Light Processing (DLP)-based 4D printing. The printed structure is composed of an array of physical binary magSMP composite elements (m-bits), analogous to digital bits. Owing to the NdFeB's photothermal effect, each m-bit can be independently and reversibly switched between unlocking or locking states (allowing or prohibiting responsive shape-morphing) in response to the on/off state of NIR-II light. Through projecting NIR-II light patterns for encoding a set of binary instructions onto 4D-printed actuators, the real-time light-programmed deformations are induced precisely under an actuation magnetic field due to the NdFeB's huge coercivity. Thus, the synergistic magnetic and light field-manipulated multimodal deformations of actuators, including mimosa shape changing, grasping, and wire guiding, are achieved. This study shines lights on the fabrication of soft structures of arbitrary sizes and provides their future perspectives in soft robot design.
{"title":"NIR-II light-encoded 4D-printed magnetic shape memory composite for real-time reprogrammable soft actuator","authors":"Shushu Miao, Yue Xing, Xu Li, Bing Sun, Zheyuan Du, Hongshuo Cao, Pengfei Guo, Yincheng Chang, Yanhong Tian, Minghui Yao, Ke Chen, Dengbao Xiao, Xuejun Zhang, Biao Zhao, Kai Pan, Jiangman Sun, Xiubing Liang","doi":"10.1016/j.apmt.2024.102413","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102413","url":null,"abstract":"For the intelligent 4D-printed actuators, the excellent performance, including quickly reversible spatial-shape transformation and locking, digital and precise shape manipulation in real-time, and remote actuation in special spaces or harsh environments, is significantly desirable but still challenging. Here, using a UV-curable system containing the shape memory polymer (SMP) and NdFeB particles, namely the magSMP composite, we fabricate a real-time reprogrammable soft actuator high-resolution Digital Light Processing (DLP)-based 4D printing. The printed structure is composed of an array of physical binary magSMP composite elements (m-bits), analogous to digital bits. Owing to the NdFeB's photothermal effect, each m-bit can be independently and reversibly switched between unlocking or locking states (allowing or prohibiting responsive shape-morphing) in response to the on/off state of NIR-II light. Through projecting NIR-II light patterns for encoding a set of binary instructions onto 4D-printed actuators, the real-time light-programmed deformations are induced precisely under an actuation magnetic field due to the NdFeB's huge coercivity. Thus, the synergistic magnetic and light field-manipulated multimodal deformations of actuators, including mimosa shape changing, grasping, and wire guiding, are achieved. This study shines lights on the fabrication of soft structures of arbitrary sizes and provides their future perspectives in soft robot design.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"11 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-03DOI: 10.1016/j.apmt.2024.102420
Yi Wu, Xuan Li, Shaopeng Liu, Ruichen Ma, Peng Liu, Kaiyong Cai
Bone repair in elderly patients is significantly weaker compared to normal bone repair, and one of the main reasons for this is the senescence of bone marrow mesenchymal stem cells (MSCs), which play a key role in the bone repair process. Therefore, we considered the corresponding surface modification of orthopedic implants to cope with the practical problem of bone defects in elderly patients. In this thesis, we prepared TiO nanotubes loaded with metformin (Glucophage) on Ti substrates, followed by self-assembly layer by layer using chitosan-catechol and gelatin on the surface, to delay MSCs senescence by eliminating excessive reactive oxygen species (ROS) and reconstructing extracellular matrix (ECM), thereby achieving osteogenesis. The results showed a significant reduction in senescence-associated secretory phenotype (SASP) generation, an enhancement of PINK1/Parkin-mediated mitochondrial autophagy, and a decrease in intracellular and extracellular ROS levels in MSCs under the dual effects of antioxidants and ECM reconstruction, suggesting that the degree of senescence in MSCs was significantly reduced. Osteogenesis was also demonstrated by expression of osteogenesis-related genes and staining of animal sections. In conclusion, our material can indeed promote the proliferation and osteogenic differentiation of MSCs by delaying cellular senescence, which is expected to provide a novel approach for clinical solutions to tissue repair problems in elderly patients with bone defects.
与正常骨修复相比，老年患者的骨修复能力明显较弱，其主要原因之一是在骨修复过程中起关键作用的骨髓间充质干细胞（MSCs）衰老。因此，我们考虑对骨科植入物进行相应的表面改性，以应对老年患者骨缺损的实际问题。在本论文中，我们在钛基底上制备了负载二甲双胍（Glucophage）的 TiO 纳米管，然后利用壳聚糖-儿茶酚和明胶在其表面逐层自组装，通过消除过多的活性氧（ROS）和重建细胞外基质（ECM）来延缓间充质干细胞的衰老，从而实现成骨。结果表明，在抗氧化剂和ECM重建的双重作用下，衰老相关分泌表型（SASP）生成明显减少，PINK1/Parkin介导的线粒体自噬增强，间充质干细胞细胞内和细胞外ROS水平下降，表明间充质干细胞的衰老程度明显降低。骨生成相关基因的表达和动物切片的染色也证明了这一点。总之，我们的材料确实能通过延缓细胞衰老促进间充质干细胞的增殖和成骨分化，有望为临床解决老年骨缺损患者的组织修复问题提供一种新方法。
{"title":"Modified implant with dual functions of antioxidant and extracellular matrix reconstruction for regulating MSCs senescence","authors":"Yi Wu, Xuan Li, Shaopeng Liu, Ruichen Ma, Peng Liu, Kaiyong Cai","doi":"10.1016/j.apmt.2024.102420","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102420","url":null,"abstract":"Bone repair in elderly patients is significantly weaker compared to normal bone repair, and one of the main reasons for this is the senescence of bone marrow mesenchymal stem cells (MSCs), which play a key role in the bone repair process. Therefore, we considered the corresponding surface modification of orthopedic implants to cope with the practical problem of bone defects in elderly patients. In this thesis, we prepared TiO nanotubes loaded with metformin (Glucophage) on Ti substrates, followed by self-assembly layer by layer using chitosan-catechol and gelatin on the surface, to delay MSCs senescence by eliminating excessive reactive oxygen species (ROS) and reconstructing extracellular matrix (ECM), thereby achieving osteogenesis. The results showed a significant reduction in senescence-associated secretory phenotype (SASP) generation, an enhancement of PINK1/Parkin-mediated mitochondrial autophagy, and a decrease in intracellular and extracellular ROS levels in MSCs under the dual effects of antioxidants and ECM reconstruction, suggesting that the degree of senescence in MSCs was significantly reduced. Osteogenesis was also demonstrated by expression of osteogenesis-related genes and staining of animal sections. In conclusion, our material can indeed promote the proliferation and osteogenic differentiation of MSCs by delaying cellular senescence, which is expected to provide a novel approach for clinical solutions to tissue repair problems in elderly patients with bone defects.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"108 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anthropogenic emissions of green-house gases and increasing CO atmospheric concentration are considered the major causes of global warming and ocean acidification. Carbon capture and sequestration turned out to be a valuable strategy to help mitigating these problems, making it urgent to develop novel materials able to selectively capture CO. Thus, in the present experimental study, a new system for CO capture based on porous mullite (3AlO⋅2SiO) substrates fabricated by Digital Light Processing and properly functionalized with Metal Organic Frameworks (MOFs) was developed. Printable ceramic pastes were obtained by mixing in proper amounts commercial mullite powders to a photocurable commercial resin with a dispersant and a sintering additive to optimize the rheological behaviour, printability, and solid loading. Then, different geometries were successfully shaped with high accuracy: bars, pellets, as well as monoliths with two structures, grid-like and Schwartz primitive triply periodic minimal surface (TPMS).
{"title":"MOFs functionalization of 3D printed mullite complex architectures for CO2 capture","authors":"Arianna Bertero, Julien Schmitt, Helena Kaper, Bartolomeo Coppola, Paola Palmero, Jean-Marc Tulliani","doi":"10.1016/j.apmt.2024.102407","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102407","url":null,"abstract":"Anthropogenic emissions of green-house gases and increasing CO atmospheric concentration are considered the major causes of global warming and ocean acidification. Carbon capture and sequestration turned out to be a valuable strategy to help mitigating these problems, making it urgent to develop novel materials able to selectively capture CO. Thus, in the present experimental study, a new system for CO capture based on porous mullite (3AlO⋅2SiO) substrates fabricated by Digital Light Processing and properly functionalized with Metal Organic Frameworks (MOFs) was developed. Printable ceramic pastes were obtained by mixing in proper amounts commercial mullite powders to a photocurable commercial resin with a dispersant and a sintering additive to optimize the rheological behaviour, printability, and solid loading. Then, different geometries were successfully shaped with high accuracy: bars, pellets, as well as monoliths with two structures, grid-like and Schwartz primitive triply periodic minimal surface (TPMS).","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"10 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-02DOI: 10.1016/j.apmt.2024.102414
Jalal Al-Lami, Felix Theska, Emilio Ahuactzin-Garcia, Sophie Primig, Catrin Davies, Minh-Son Pham
Despite the high interest in fabricating Inconel 718 by laser powder bed fusion (L-PBF) and the alloy's wide applicability at high temperatures in aerospace and energy applications, there is limited information on its thermal dependence. In this work, we studied the thermal dependence of Inconel 718 fabricated by L-PBF over a temperature range of 25 to 650 °C, and strain rates of 10 and 10 s. Serrated flow stress indicative of dynamic strain ageing (DSA) was observed at 250 and 450 °C at both strain rates. While previous studies reported that DSA was associated with the interactions of C and Nb with dislocations, direct examinations of solute cluster evolution using atom probe tomography (APT) in this study show strong evidence of Nb and Ti clusters at 250 °C, suggesting that both Nb and Ti clusters are responsible for the stress serrations at this temperature. At 450 °C, APT examinations revealed only weak evidence of Nb clusters but strong presence of Ti clusters, indicating that Ti might be most likely responsible for the DSA response at 450 °C. In addition, the yield strength decreased with temperature until 450 °C due to thermally-assisted softening, but the strength was regained with further temperature increase to 650 °C. APT and transmission electron microscopy (TEM) examinations reveal that the strengthening at 650 °C was imparted by nanoscale solute clustering (short-range ordering) of Al, Ti and Nb atoms, which had not developed into mature γ' and γ" precipitates. The insights revealed in this study provide a new perspective of the mechanisms underlying the thermal dependence of Inconel 718.
尽管人们对通过激光粉末床熔融（L-PBF）制造 Inconel 718 很感兴趣，而且这种合金在航空航天和能源领域的高温应用也很广泛，但有关其热依赖性的信息却很有限。在这项工作中，我们研究了通过 L-PBF 制造的 Inconel 718 在 25 至 650 ℃ 的温度范围内以及 10 秒和 10 秒的应变速率下的热依赖性。在 250 ℃ 和 450 ℃ 的两种应变速率下，都观察到了表明动态应变老化（DSA）的锯齿状流动应力。虽然之前的研究报告称 DSA 与 C 和 Nb 与位错的相互作用有关，但本研究中使用原子探针断层扫描（APT）对溶质团簇的演变进行的直接检查显示，在 250 ℃ 时存在 Nb 和 Ti 团簇的有力证据，表明 Nb 和 Ti 团簇是造成该温度下应力锯齿的原因。在 450 ℃ 时，APT 检测只发现了较弱的 Nb 簇，但却发现了较强的 Ti 簇，这表明 Ti 很可能是 450 ℃ 时 DSA 响应的原因。此外，由于热助软化，屈服强度在 450 ℃ 之前随温度升高而降低，但随着温度进一步升高至 650 ℃，强度又重新恢复。APT 和透射电子显微镜（TEM）检查显示，650 ℃ 时的强化是由 Al、Ti 和 Nb 原子的纳米级溶质团聚（短程有序化）产生的，这些溶质团聚尚未发展成成熟的 γ' 和 γ" 沉淀。本研究揭示的见解为 Inconel 718 热依赖性的内在机制提供了一个新的视角。
{"title":"On the origin of thermal dependence of 3D printed Inconel 718: Roles of atom clustering","authors":"Jalal Al-Lami, Felix Theska, Emilio Ahuactzin-Garcia, Sophie Primig, Catrin Davies, Minh-Son Pham","doi":"10.1016/j.apmt.2024.102414","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102414","url":null,"abstract":"Despite the high interest in fabricating Inconel 718 by laser powder bed fusion (L-PBF) and the alloy's wide applicability at high temperatures in aerospace and energy applications, there is limited information on its thermal dependence. In this work, we studied the thermal dependence of Inconel 718 fabricated by L-PBF over a temperature range of 25 to 650 °C, and strain rates of 10 and 10 s. Serrated flow stress indicative of dynamic strain ageing (DSA) was observed at 250 and 450 °C at both strain rates. While previous studies reported that DSA was associated with the interactions of C and Nb with dislocations, direct examinations of solute cluster evolution using atom probe tomography (APT) in this study show strong evidence of Nb and Ti clusters at 250 °C, suggesting that both Nb and Ti clusters are responsible for the stress serrations at this temperature. At 450 °C, APT examinations revealed only weak evidence of Nb clusters but strong presence of Ti clusters, indicating that Ti might be most likely responsible for the DSA response at 450 °C. In addition, the yield strength decreased with temperature until 450 °C due to thermally-assisted softening, but the strength was regained with further temperature increase to 650 °C. APT and transmission electron microscopy (TEM) examinations reveal that the strengthening at 650 °C was imparted by nanoscale solute clustering (short-range ordering) of Al, Ti and Nb atoms, which had not developed into mature γ' and γ\" precipitates. The insights revealed in this study provide a new perspective of the mechanisms underlying the thermal dependence of Inconel 718.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"13 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the search for more efficient and sustainable photoelectrochemical devices, BiVO is nowadays one of the best-performing photoanode material, with favourable band structure for water oxidation. However, BiVO photoanodes face challenges such as poor charge transport and slow kinetics. To address these issues, SnO films are commonly used as hole blocking layers, reducing recombination rate and enhancing charge lifespan and overall productivity. Yet, this method encounters problems like high defect concentrations at the SnO/BiVO interface and pinholes in the SnO layer, which lead to charge recombination. In this study, we explore a ZrCl treatment to improve the effectiveness of SnO as a hole-blocking layer in BiVO photoanodes. Our findings, supported by detailed optoelectronic characterization and continuous and modulated electrochemical analysis, reveal that ZrCl treatment significantly enhances the hole-blocking properties of SnO. This treatment results in a 37 % increase in photocurrent density at 1.23 V and a 40 mV shift in the onset voltage, demonstrating a substantial improvement in overall photoanode efficiency.
在寻找更高效、更可持续的光电化学器件的过程中，BiVO 是当今性能最好的光阳极材料之一，它具有有利于水氧化的带状结构。然而，BiVO 光阳极面临着电荷传输差和动力学缓慢等挑战。为了解决这些问题，氧化锡薄膜通常被用作空穴阻挡层，以降低重组率，提高电荷寿命和整体生产率。然而，这种方法会遇到一些问题，如氧化锡/氧化铋界面上的高缺陷浓度和氧化锡层中的针孔，从而导致电荷重组。在本研究中，我们探索了一种氯化锌处理方法，以提高氧化锡在 BiVO 光阳极中作为空穴阻挡层的有效性。通过详细的光电表征以及连续和调制电化学分析，我们的研究结果表明，氯化锆处理能显著增强氧化锡的空穴阻挡特性。经过这种处理后，1.23 V 时的光电流密度增加了 37%，起始电压降低了 40 mV，这表明光阳极的整体效率得到了大幅提高。
{"title":"Enhancing charge extraction in BiVO4 photoanodes by ZrCl4 treatment of SnO2 hole-blocking layers","authors":"Valentina Gacha, Carles Ros, Xènia Garcia, Jordi Llorca, Jordi Martorell, Dimitrios Raptis","doi":"10.1016/j.apmt.2024.102415","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102415","url":null,"abstract":"In the search for more efficient and sustainable photoelectrochemical devices, BiVO is nowadays one of the best-performing photoanode material, with favourable band structure for water oxidation. However, BiVO photoanodes face challenges such as poor charge transport and slow kinetics. To address these issues, SnO films are commonly used as hole blocking layers, reducing recombination rate and enhancing charge lifespan and overall productivity. Yet, this method encounters problems like high defect concentrations at the SnO/BiVO interface and pinholes in the SnO layer, which lead to charge recombination. In this study, we explore a ZrCl treatment to improve the effectiveness of SnO as a hole-blocking layer in BiVO photoanodes. Our findings, supported by detailed optoelectronic characterization and continuous and modulated electrochemical analysis, reveal that ZrCl treatment significantly enhances the hole-blocking properties of SnO. This treatment results in a 37 % increase in photocurrent density at 1.23 V and a 40 mV shift in the onset voltage, demonstrating a substantial improvement in overall photoanode efficiency.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"137 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-31DOI: 10.1016/j.apmt.2024.102398
Joanna Pośpiech, Małgorzata Nadolska, Mateusz Cieślik, Tomasz Sobczyk, Marek Chmielewski, Aleksandra Mielewczyk-Gryń, Ragnar Strandbakke, José Manuel Serra, Sebastian Lech Wachowski
A hybrid system combining robocasting and NIR laser postprocessing has been designed to fabricate layers of mixed proton-electron conducting BaLaCoFeO ceramic. The proposed manufacturing technique allows for the control of the geometry and microstructure and shortens the fabrication time to a range of a few minutes. Using 5 W laser power and a scanning speed of 500 mm·s, sintering of a round-shaped layer with an 8 mm radius was performed in less than 2 s. The single phase of the final product was confirmed by X-ray diffraction. Various ceramic-to-polymer weight ratios were tested, showing that various porosities of microstructures of ∼30 - 35 % and ∼19 % can be obtained with 2:1 and 4:1 loading respectively.
{"title":"Additive manufacturing of Proton-Conducting Ceramics by robocasting with integrated laser postprocessing","authors":"Joanna Pośpiech, Małgorzata Nadolska, Mateusz Cieślik, Tomasz Sobczyk, Marek Chmielewski, Aleksandra Mielewczyk-Gryń, Ragnar Strandbakke, José Manuel Serra, Sebastian Lech Wachowski","doi":"10.1016/j.apmt.2024.102398","DOIUrl":"https://doi.org/10.1016/j.apmt.2024.102398","url":null,"abstract":"A hybrid system combining robocasting and NIR laser postprocessing has been designed to fabricate layers of mixed proton-electron conducting BaLaCoFeO ceramic. The proposed manufacturing technique allows for the control of the geometry and microstructure and shortens the fabrication time to a range of a few minutes. Using 5 W laser power and a scanning speed of 500 mm·s, sintering of a round-shaped layer with an 8 mm radius was performed in less than 2 s. The single phase of the final product was confirmed by X-ray diffraction. Various ceramic-to-polymer weight ratios were tested, showing that various porosities of microstructures of ∼30 - 35 % and ∼19 % can be obtained with 2:1 and 4:1 loading respectively.","PeriodicalId":8066,"journal":{"name":"Applied Materials Today","volume":"386 1","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：