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1
Soliman, Mai, Alhanoof Aldegheishem, Norah Alsubaie, Razan Alshamrani et Elzahraa Eldwakhly. « Dimensional Accuracy of Working Dies Fabricated by Different Impression Materials and Techniques : 3D Digital Assessment ». Journal of Biomaterials and Tissue Engineering 11, no 1 (1 janvier 2021) : 106–11. http://dx.doi.org/10.1166/jbt.2021.2552.
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Accuracy of dental impression plays a significant role in the success of definitive restorations. This study aimed to compare the dimensional accuracy of working dies fabricated using two different impression materials and techniques. Forty working dies fabricated from 40 impressions of preprepared mandibular first molar tooth replica stabilized in a jaw model to receive full coverage crown. Two different Polyvinyl siloxane (PVS) impression materials were used; Aquasil and Virtual. Two different impression techniques were used with each type of impression material; One-step and two-step. The working dies dimensional accuracy was measured in four dimensions and compared with that of the preprepared molar tooth replica using a digital caliper and 3D scanner. Based on a 3D scanner, there were a significant difference of dies fabricated by the two tested impression materials using the two-step impression technique in Mesiodistal-Gingival dimension (IIA and IIB) groups compared to the preprepared tooth replica with an average 0.370 μm (P < .005). A significant difference was observed of the dies fabricated by the two tested impression techniques using virtual impression. material in Mesiodistal Occlusal dimensions with an average 0.135 μm (P < .03), and in Mesiodistal-Gingival dimensions with an average 0.490 μm (P < .001) and Buccolingual-Gingival dimensions with an average 0.143 μm (P < .005) using Aquasil impression material compared to the preprepared molar tooth replica. Both impression materials (Aquasil and Virtual) and techniques (One-step and Two-step) used in this study produced working dies with clinically accepted dimensional accuracy.
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Ray, Marie-Céline. « Les nouvelles technologies au service de la santé ». Questions internationales 91-92, no 3 (27 juin 2018) : 83–92. http://dx.doi.org/10.3917/quin.091.0083.
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Biotechnologies appliquées à la médecine, nouvelles technologies de l’information avec l’e-santé, robotique chirurgicale, impression 3D…, les nouvelles technologies dans le domaine de la santé prennent des formes multiples. Derrière certaines de ces innovations, comme la modification du vivant ou l’utilisation des mégadonnées en santé, émergent de nouvelles questions éthiques .
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Alqahtani, Sultan Awad Hasan. « Enhancing dental practice ». Brazilian Journal of Oral Sciences 23 (27 septembre 2024) : e0240115. http://dx.doi.org/10.20396/bjos.v23i00.8674785.
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Digital technology offers many opportunities and challenges across various domains. Aim: This comprehensive review explores the transformative impact of digitalization on dental practices, encompassing digital Imaging, 3D printing, intraoral scanners, teledentistry, Artificial Intelligence, CAD-CAM technology, and virtual reality. Methods: A rigorous search was conducted across various electronic bases, including PubMed, Google Scholar, Scopus, and the National Center for Biotechnology Information (NCBI). The search employed keywords such as “Orthodontics,” “Dental Health,” “Dental Imaging,” “CAD-CAM,” “Digital Medicine,” “Teleconsultation,” “Intraoral Scanner,” “Artificial Intelligence (AI),” “Digital Health,” “Teledentistry,” and “3D Dentistry.” Papers published between 2017 and the present were considered, focusing on peer-reviewed journals and reviews providing comprehensive insights into digital dentistry. Results: The review highlights the diverse facts of digitalization in dentistry, emphasizing its potential benefits for patient practitioners and the dental industry. Digital impressions, 3D printing, and CAD-CAM are streamlining restorative dentistry. In orthodontics, digital models enable precise simulations. Artificial Intelligence promises more efficient diagnostics and treatment planning. Conclusion: Digital technology is poised to reshape dentistry, improving efficiency, patient outcomes, and practitioner experiences. However, challenges such as data security and ethical considerations must be addressed. The successful integration of digital dentistry into dental practice will require more research and innovation, even though this review offers a thorough overview of the field.
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Al-Aali, Khulud A., Abeer R. Alshehri, Hiba R. Talic, Ayaan A. Magan et Felwa K. Alhomody. « Dimensional Accuracy of 3D-Printed, Digital and Conventional Stone Dental Cast of Dentate Patients Using Arch and Teeth Measurements ». Journal of Biomaterials and Tissue Engineering 13, no 7 (1 juillet 2023) : 803–7. http://dx.doi.org/10.1166/jbt.2023.3316.
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Aim: This study aimed to compare the conventional, digital, and three-dimensional (3D)-printed casts in terms of their accuracy in quantifying arch and teeth measurements. Materials and Methods: The conventional casts were prepared using polyether dental impressions. Digital impressions of the typodont reference casts were accomplished using an intra-oral scanner. The digital casts were first converted to stereolithography (STL) files which were then edited, and printed using an SLA printer and photo-polymer resin material. The measurements of the first two groups were completed using a digital caliper, while an imaging software was used to measure digital casts. The occlusocervial (OC) height and mesiodistal (MD) width of canines, second premolars (PMs), and molars of each jaw were measured. Additionally, intercanine width (ICW) and intermolar width (IMW) were also measured. Results: Overall, the lowest OC measurement errors were observed for 3D-printed casts for the upper canine, lower canine, and lower molar (0.003±0.01 mm). Similarly, the lowest MD measurement errors were observed for 3D-printed casts for upper canine, upper PM, and lower PM (0.002±0.01 mm). The ICW and IMW measurement errors for the 3D-printed casts were significantly lower (p < 0.01) for the upper ICW (0.011±0.01 mm) and lower IMW (0.017±0.01 mm) than the other two groups. Compared to the conventional and digital casts, the lower ICW (0.013±0.01 mm) and upper IMW (0.017±0.01 mm) measurement errors observed for the 3D-printed casts were also lower, but non-significantly (p > 0.01). Conclusions: 3D-printed casts presented the lowest OC, MD, ICW, and IMW measurement errors, than the conventional and digital casts. The highest measurement errors were associated with the digital casts.
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Kustrzycka, Dorota, Tim Marschang, Marcin Mikulewicz et Wojciech Grzebieluch. « Comparison of the Accuracy of 3D Images Obtained fromDifferent Types of Scanners : A Systematic Review ». Journal of Healthcare Engineering 2020 (14 décembre 2020) : 1–7. http://dx.doi.org/10.1155/2020/8854204.
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Introduction. The purpose of this systematic review was to compare the accuracy of the three-dimensional images among different scanners, scanning techniques, and substrates. Materials and methods. Electronic databases (PubMed and Elsevier) were searched until March 2020. The systematic search was performed to identify the most precise method of obtaining a 3D image of the dentition. Results. Thirteen articles out of 221, considering the accuracy of 3D images, were selected. The main factors that are considered to have an influence on the precision are substrate type in the oral cavity, experience of the scanner’s operator, direct vs. indirect scanning, and the reproducibility of the procedure. Conclusion. Substrate type does have an impact on the overall accuracy of intraoral scans where dentin has the most and enamel the least accurately recorded dental structure. Experience of the operator has an influence on the accuracy, where more experienced operators and smaller scan sizes are made for more accurate scans. A conventional impression technique in a full-arch image provided the lowest deviation. The reproducibility of direct scanning was comparable to indirect scanning although a slight difference was noticeable (0.02 mm).
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Salmi, Mika, Kaija-Stiina Paloheimo, Jukka Tuomi, Tuula Ingman et Antti Mäkitie. « A digital process for additive manufacturing of occlusal splints : a clinical pilot study ». Journal of The Royal Society Interface 10, no 84 (6 juillet 2013) : 20130203. http://dx.doi.org/10.1098/rsif.2013.0203.
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The aim of this study was to develop and evaluate a digital process for manufacturing of occlusal splints. An alginate impression was taken from the upper and lower jaws of a patient with temporomandibular disorder owing to cross bite and wear of the teeth, and then digitized using a table laser scanner. The scanned model was repaired using the 3D ata E xpert software, and a splint was designed with the V iscam RP software. A splint was manufactured from a biocompatible liquid photopolymer by stereolithography. The system employed in the process was SLA 350. The splint was worn nightly for six months. The patient adapted to the splint well and found it comfortable to use. The splint relieved tension in the patient's bite muscles. No sign of tooth wear or significant splint wear was detected after six months of testing. Modern digital technology enables us to manufacture clinically functional occlusal splints, which might reduce costs, dental technician working time and chair-side time. Maximum-dimensional errors of approximately 1 mm were found at thin walls and sharp corners of the splint when compared with the digital model.
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Niu, Tianqi, Qifan Xue et Hin-Lap Yip. « Advances in Dion-Jacobson phase two-dimensional metal halide perovskite solar cells ». Nanophotonics 10, no 8 (1 juin 2020) : 2069–102. http://dx.doi.org/10.1515/nanoph-2021-0052.
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Abstract Low-dimensional metal halide perovskites have emerged as promising alternatives to the traditional three-dimensional (3D) components, due to their greater structural tunability and environmental stability. Dion-Jacobson (DJ) phase two-dimensional (2D) perovskites, which are formed by incorporating bulky organic diammonium cations into inorganic frameworks that comprises a symmetrically layered array, have recently attracted increasing research interest. The structure-property characteristics of DJ phase perovskites endow them with a unique combination of photovoltaic efficiency and stability, which has led to their impressive employment in perovskite solar cells (PSCs). Here, we review the achievements that have been made to date in the exploitation of DJ phase perovskites in photovoltaic applications. We summarize the various ligand designs, optimization strategies and applications of DJ phase PSCs, and examine the current understanding of the mechanisms underlying their functional behavior. Finally, we discuss the remaining bottlenecks and future outlook for these promising materials, and possible development directions of further commercial processes.
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ANDRÉ, Jean-Claude. « Impression 3D : niches applicatives porteuses ». Fabrication additive – Impression 3D, avril 2017. http://dx.doi.org/10.51257/a-v1-bm7970.
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Swain, Nilimapriyadarsini, Saravanakumar Balasubramaniam et Ananthakumar Ramadoss. « Effective Energy Storage Performance Derived from 3D Porous Dendrimer Architecture Metal Phosphides//Metal Nitride‐Sulfides ». Small, 5 février 2024. http://dx.doi.org/10.1002/smll.202309800.
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AbstractThe present work addresses the limitations by fabricating a wide range of negative electrodes, including metal nitrides/sulfides on a 3D bimetallic conductive porous network (3D‐Ni and 3D‐NiCo) via a dynamic hydrogen bubble template (DHBT) method followed by vapour phase growth (VPG) process. Among the prepared negative electrodes, the 3D‐Fe3S4‐Fe4N/NiCo nanostructure demonstrates an impressive specific capacitance (Cs) of 1125 F g−1 (2475 mF cm−2) at 1 A g−1 with 80% capacitance retention over 5000 cycles. Similarly, a 3D‐Mn3P nanostructured positive electrode fabricated via electrodeposition followed by a phosphorization process exhibits a maximum specific capacity (Cg) of 923.04 C g−1 (1846.08 mF cm−2) at 1 A g−1 with 80% stability. A 3D‐Mn3P/Ni//3D‐Fe3S4‐Fe4N/NiCo supercapattery is also assembled, and it shows a notable CS of 151 F g−1 at 1 A g−1, as well as a high energy density (ED) of 51 Wh kg−1,a power density (PD) of 782.57 W kg−1 and a capacitance efficiency of 76% over 10 000 cycles. This may be ascribed to the use of a bimetallic 3D porous conductive template and the attachment of transition metal sulfide and nitride. The development of negative electrodes and supercapattery devices is greatly aided by this exploration of novel synthesis techniques and material choice.
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Yu, Diwen, Kaixuan Guo, Fengxiao Hou, Yangang Zhang, Xiaolin Ye, Yaohui Zhang, Puguang Ji et al. « Ti─O─C Bonding at 2D Heterointerfaces of 3D Composites for Fast Sodium Ion Storage at High Mass Loading Level ». Small, 18 avril 2024. http://dx.doi.org/10.1002/smll.202312167.
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Abstract3D composite electrodes have shown extraordinary promise as high mass loading electrode materials for sodium ion batteries (SIBs). However, they usually show poor rate performance due to the sluggish Na+ kinetics at the heterointerfaces of the composites. Here, a 3D MXene‐reduced holey graphene oxide (MXene‐RHGO) composite electrode with Ti─O─C bonding at 2D heterointerfaces of MXene and RHGO is developed. Density functional theory (DFT) calculations reveal the built‐in electric fields (BIEFs) are enhanced by the formation of bridged interfacial Ti─O─C bonding, that lead to not only faster diffusion of Na+ at the heterointerfaces but also faster adsorption and migration of Na+ on the MXene surfaces. As a result, the 3D composite electrodes show impressive properties for fast Na+ storage. Under high current density of 10 mA cm−2, the 3D MXene‐RHGO composite electrodes with high mass loading of 10 mg cm−2 achieve a strikingly high and stable areal capacity of 3 mAh cm−2, which is same as commercial LIBs and greatly exceeds that of most reported SIBs electrode materials. The work shows that rationally designed bonding at the heterointerfaces represents an effective strategy for promoting high mass loading 3D composites electrode materials forward toward practical SIBs applications.
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Fan, Shuhan, Qu Yang, Guilin Yin, Xiaosi Qi, Yuyu Feng, Junfei Ding, Qiong Peng et al. « All‐Inorganic Perovskite NiTiO3/Cs3Sb2I9 Heterostructure for Photocatalytic CO2 Reduction to CH4 with High Selectivity ». Small, 15 février 2024. http://dx.doi.org/10.1002/smll.202311978.
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AbstractDeveloping efficient and stable halide perovskite‐based photocatalysts for highly selectivity reduction CO2 to valuable fuels remains a significant challenge due to their intrinsic instability. Herein, a novel heterostructure featuring 2D Cs3Sb2I9 nanosheets on a 3D flower‐like mesoporous NiTiO3 framework using a top‐down stepwise membrane fabrication technique is constructed. The unique bilayer heterostructure formed on the 3D mesoporous framework endowed NiTiO3/Cs3Sb2I9 with sufficient and close interface contact, minimizing charge transport distance, and effectively promoting the charge transfer at the interface, thus improving the reaction efficiency of the catalyst surface. As revealed by characterization and calculation, the coupling of Cs3Sb2I9 with NiTiO3 facilitates the hydrogenation process during catalytic, directing reaction intermediates toward highly selective CH4 production. Furthermore, the van der Waals forces inherent in the 3D/2D heterostructure with face‐to‐face contact provide superior stability, ensuring the efficient realization of photocatalytic CO2 reduction to CH4. Consequently, the optimized 3D/2D NiTiO3/Cs3Sb2I9 heterostructure demonstrates an impressive CH4 yield of 43.4 µmol g−1 h−1 with a selectivity of up to 88.6%, surpassing most reported perovskite‐based photocatalysts to date. This investigation contributes to overcoming the challenges of commercializing perovskite‐based photocatalysts and paves the way for the development of sustainable and efficient CO2 conversion technologies.
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Peeney, David. « Assessing the effects of TIMP2 knockout on lung cancer cell lines cultured in 3D ». FASEB Journal 31, S1 (avril 2017). http://dx.doi.org/10.1096/fasebj.31.1_supplement.808.4.
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Tissue inhibitor of matrix metalloproteinases (TIMPs) are a small family of endogenous proteins that classically function to inhibit metalloproteinase activity. Since the original description of this protein family in the 80s and 90s, various MMP‐independent biological functions of TIMPs have been described. This built the impression that MMP/TIMP ratios may play an important role in tissue homeostasis, an idea which is supported by the observation that altered MMP/TIMP expression ratios are often associated with a number of human conditions such as cancer, cardiovascular and CNS disease. TIMP2 is the most abundantly expressed protein in this family and has previously been shown to interact with several membrane proteins including MT1‐MMP, insulin‐like growth factor‐1 receptor (IGF‐I‐R) and alpha3 beta1 integrin (α3β1) to mediate downstream intracellular signaling. In addition, TIMP2 has been shown to inhibit growth factor stimulated proliferation, angiogenesis and tumor cell invasion and metastasis, highlighting the potential for TIMP2‐based cancer bio‐therapies that can be used in conjunction with conventional treatments. Recent studies in our lab highlight that syngeneic lung tumors (LL2 cells; Lewis lung carcinoma) developed in C57BL mice harboring a loss‐of‐function mutation in TIMP2 are significantly larger than tumors grown in their WT counterparts. To gain a deeper understanding of the role of TIMP2 in tumor initiation and progression we have used CRISPR‐Cas9 to develop stable TIMP2 knockout (T2KO) human lung cancer cell lines. Although indistinguishable in 2D culture, T2KO tumor cells display a morphologically distinct phenotype when grown in spheroids. Preliminary data show that, when grown in spheroids, T2KO cells exhibit enhanced EGFR activation in comparison to WT cells. By assessing the functional characteristics and gene expression of T2KO cells grown in 3D culture conditions we hope to gain further insight into the biological functions of TIMP2 and to provide a mechanistic link between the loss of TIMP2 activity and enhanced tumor formation that is observed in our mouse model.
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Lu, Huibing, Weimin Hua, Zhengchunyu Zhang, Xuguang An, Jinkui Feng, Baojuan Xi et Shenglin Xiong. « Self–Zincophilic Dual Protection Host of 3D ZnO/Zn⊂CF to Enhance Zn Anode Cyclability ». Small, 19 mars 2024. http://dx.doi.org/10.1002/smll.202312187.
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AbstractZn dendrite growth and side reactions restrict the practical use of Zn anode. Herein, the design of a novel 3D hierarchical structure is demonstrated with self–zincophilic dual–protection constructed by ZnO and Zn nanoparticles immobilized on carbon fibers (ZnO/Zn⊂CF) as a versatile host on the Zn surface. The unique 3D frameworks with abundant zinc nucleation storage sites can alleviate the structural stress during the plating/stripping process and overpower Zn dendrite growth by moderating Zn2+ flux. Moreover, given the dual protection design, it can reduce the contact area between active zinc and electrolyte, inhibiting hydrogen evolution reactions. Importantly, density functional theory calculations and experimental results confirm that the introduced O atoms in ZnO/Zn⊂CF enhance the interaction between Zn2+ and the host and reduce Zn nucleation overpotential. As expected, the ZnO/Zn⊂CF–Zn electrode exhibits stable Zn plating/stripping with low polarization for 4200 h at 0.2 mA cm−2 and 0.2 mAh cm−2. Furthermore, the symmetrical cell displays a significantly long cycling life of over 1800 h, even at 30 mA cm−2. The fabricated full cells also show impressive cycling performance when coupled with V2O3 cathodes.
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Guo, Binbin, Jie Lin, Funian Mo, Yihong Ding, Tianbiao Zeng, Haowen Liang, Liping Wang et al. « Robust and Corrosion‐Resistant Overall Water Splitting Electrode Enabled by Additive Manufacturing ». Small, 27 février 2024. http://dx.doi.org/10.1002/smll.202312216.
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AbstractElectrolysis of water has emerged as a prominent area of research in recent years. As a promising catalyst support, copper foam is widely investigated for electrolytic water, yet the insufficient mechanical strength and corrosion resistance render it less suitable for harsh working conditions. To exploit high‐performance catalyst supports, various metal supports are comprehensively evaluated, and Ti6Al4V (Ti64) support exhibited outstanding compression and corrosion resistance. With this in mind, a 3D porous Ti64 catalyst support is fabricated using the selective laser sintering (SLM) 3D printing technology, and a conductive layer of nickel (Ni) is coated to increase the electrical conductivity and facilitate the deposition of catalysts. Subsequently, Co0.8Ni0.2(CO3)0.5(OH)·0.11H2O (CoNiCH) nanoneedles are deposited. The resulting porous Ti64/Ni/CoNiCH electrode displayed an impressive performance in the oxygen evolution reaction (OER) and reached 30 mA cm−2 at an overpotential of only 200 mV. Remarkably, even after being compressed at 15.04 MPa, no obvious structural deformation is observed, and the attenuation of its catalytic efficiency is negligible. Based on the computational analysis, the CoNiCH catalyst demonstrated superior catalytic activity at the Ni site in comparison to the Co site. Furthermore, the electrode reached 30 mA cm−2 at 1.75 V in full water splitting conditions and showed no significant performance degradation even after 60 h of continuous operation. This study presents an innovative approach to robust and corrosion‐resistant catalyst design.
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Wang, Shuo, Haiting Shi, Shuaitong Liang, Hao Li, Yuanhua Xia, Ruiqi Shao, Tianyu Li, Jie Shi, Xiaoqing Wu et Zhiwei Xu. « Oxygen Vacancy and Bandgap Simultaneous Modulation to Achieve High Lithiophilicity and Mechanical Strength of Lithium Metal Anodes ». Small, 27 février 2024. http://dx.doi.org/10.1002/smll.202311740.
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AbstractMetal oxides with conversion and alloying mechanisms are more competitive in suppressing lithium dendrites. However, it is difficult to simultaneously regulate the conversion and alloying reactions. Herein, conversion and alloying reactions are regulated by modulation of the zinc oxide bandgap and oxygen vacancies. State‐of‐the‐art advanced characterization techniques from a microcosmic to a macrocosmic viewpoint, including neutron diffraction, synchrotron X‐ray absorption spectroscopy, synchrotron X‐ray microtomography, nanoindentation, and ultrasonic C‐scan demonstrated the electrochemical gain benefit from plentiful oxygen vacancies and low bandgaps due to doping strategies. In addition, high mechanical strength 3D morphology and abundant mesopores assist in the uniform distribution of lithium ions. Consequently, the best‐performed ZnO‐2 offers impressive electrochemical properties, including symmetric Li cells with 2000 h and full cells with 81% capacity retention after 600 cycles. In addition to providing a promising strategy for improving the lithiophilicity and mechanical strength of metal oxide anodes, this work also sheds light on lithium metal batteries for practical applications.
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Ge, Jiale, Jian Meng, Leiqian Zhang, Jingjing Qin, Guozheng Yang, Yunchen Wu, Haiyan Zhu et al. « Inducing Directional Charge Delocalization in 3D‐Printable Micro‐Supercapacitors Based on Strongly Coupled Black Phosphorus and ReS2 Nanocomposites ». Small, 22 février 2024. http://dx.doi.org/10.1002/smll.202312019.
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AbstractThe growing interest in so‐called interface coupling strategies arises from their potential to enhance the performance of active electrode materials. Nevertheless, designing a robust coupled interface in nanocomposites for stable electrochemical processes remains a challenge. In this study, an epitaxial growth strategy is proposed by synthesizing sulfide rhenium (ReS2) on exfoliated black phosphorus (E‐BP) nanosheets, creating an abundance of robust interfacial linkages. Through spectroscopic analysis using X‐ray photoelectron spectroscopy and X‐ray absorption spectroscopy, the authors investigate the interfacial environment. The well‐developed coupled interface and structural stability contribute to the impressive performance of the 3D‐printed E‐BP@ReS2‐based micro‐supercapacitor, achieving a specific capacitance of 47.3 mF cm−2 at 0.1 mA cm−2 and demonstrating excellent long‐term cyclability (89.2% over 2000 cycles). Furthermore, density functional theory calculations unveil the positive impact of the strongly coupled interface in the E‐BP@ReS2 nanocomposite on the adsorption of H+ ions, showcasing a significantly reduced adsorption energy of −2.17 eV. The strong coupling effect facilitates directional charge delocalization at the interface, enhancing the electrochemical performance of electrodes and resulting in the successful construction of advanced micro‐supercapacitors.
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Li, Yong, Qinhao Shi, Xuan Yu, Fanghua Ning, Guoliang Liu, Xuan Wang, Juan Wang, YunHua Xu et Yufeng Zhao. « Trace Y Doping Regulated Bulk/Interfacial Reactions of P2‐Layered Oxides for Ultrahigh‐Rate Sodium‐Ion Batteries ». Small, 15 février 2024. http://dx.doi.org/10.1002/smll.202310756.
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AbstractP2‐phase layered cathodes play a pivotal role in sodium‐ion batteries due to their efficient Na+ intercalation chemistry. However, limited by crystal disintegration and interfacial instability, bulk and interfacial failure plague their electrochemical performance. To address these challenges, a structural enhancement combined with surface modification is achieved through trace Y doping. Based on a synergistic combination of experimental results and density functional theory (DFT) calculations, the introduction of partial Y ions at the Na site (2d) acts as a stabilizing pillar, mitigating the electrostatic repulsions between adjacent TMO2 slabs and thereby relieving internal structural stress. Furthermore, the presence of Y effectively optimizes the Ni 3d‐O 2p hybridization, resulting in enhanced electronic conductivity and a notable rapid charging ability, with a capacity of 77.3 mA h g−1 at 40 C. Concurrently, the introduction of Y also induces the formation of perovskite nano‐islands, which serve to minimize side reactions and modulate interfacial diffusion. As a result, the refined P2‐Na0.65 Y0.025[Ni0.33Mn0.67]O2 cathode material exhibits an exceptionally low volume variation (≈1.99%), an impressive capacity retention of 83.3% even at −40 °C after1500 cycles at 1 C.
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Wang, Jinpeng, Yongkang Qi, Yuhan Gui, Can Wang, Yikai Wu, Jiandong Yao et Jie Wang. « Ultrastretchable E‐Skin Based on Conductive Hydrogel Microfibers for Wearable Sensors ». Small, 10 octobre 2023. http://dx.doi.org/10.1002/smll.202305951.
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AbstractConductive microfibers play a significant role in the flexibility, stretchability, and conductivity of electronic skin (e‐skin). Currently, the fabrication of conductive microfibers suffers from either time‐consuming and complex operations or is limited in complex fabrication environments. Thus, it presents a one‐step method to prepare conductive hydrogel microfibers based on microfluidics for the construction of ultrastretchable e‐skin. The microfibers are achieved with conductive MXene cores and hydrogel shells, which are solidified with the covalent cross‐linking between sodium alginate and calcium chloride, and mechanically enhanced by the complexation reaction of poly(vinyl alcohol) and sodium hydroxide. The microfiber conductivities are tailorable by adjusting the flow rate and concentration of core and shell fluids, which is essential to more practical applications in complex scenarios. More importantly, patterned e‐skin based on conductive hydrogel microfibers can be constructed by combining microfluidics with 3D printing technology. Because of the great advantages in mechanical and electrical performance of the microfibers, the achieved e‐skin shows impressive stretching and sensitivity, which also demonstrate attractive application values in motion monitoring and gesture recognition. These characteristics indicate that the ultrastretchable e‐skin based on conductive hydrogel microfibers has great potential for applications in health monitoring, wearable devices, and smart medicine.
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Zhang, Miaomiao, Rongjie Luo, Qifei Guo, Zihuan Tang, Xingxing Li, Biao Gao, Xuming Zhang, Kaifu Huo et Yang Zheng. « Structural and Interfacial Manipulation of Multifunctional Skeletons Enabled Shuttling‐Free and Dendrite‐Free Li–S Full Batteries ». Small, 23 août 2023. http://dx.doi.org/10.1002/smll.202303784.
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AbstractLi–S batteries are regarded as promising devices for energy storage systems owing to high energy density, low cost, and environmental friendliness. However, challenges of polysulfides shuttling in sulfur cathode and dendrite growth of lithium anode severely hinder the practical application. Developing advanced skeletons simultaneously regulating the cathode and anode is significant and challenging. Hence, a novel and scalable strategy combining spray drying and topological nitriding is proposed, and hierarchically assembled rGO hollow microspheres encapsulated highly porous nanospheres consisted of ultrafine Nb4N5‐Nb2O5 or Nb4N5 nanoparticles as multifunctional skeletons for S and Li are designed. In such unique architecture, a 3D highly porous structure provides abundant void space for loading of S and Li, and accommodates volume change during cycling. Moreover, Nb4N5‐Nb2O5 heterostructured interface promotes adsorption‐conversion process of polysulfides, while strong lithophilic Nb4N5 induces the selective infiltration of Li into the void of the skeleton and regulates the uniform deposition and growth. More interestingly, in situ generated Li3N@Nb ion/electron conducting interfaces induced by the reaction of Nb4N5 and Li reduce the nucleation overpotential and induce selective deposition of Li into the cavity. Consequently, the Li–S full cell exhibits superior cycling stability and impressive rate performance with a low capacity ratio of negative/positive.
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Liu, Zhiyuan, Rui Zhang, Jie Fu, Xianzheng Liu, Huazeng Yang, Deyu Wang, Xin Xu, Jun Cao, Guangwu Wen et Dong Wang. « Mass Loading‐Independent Lithium Storage of Transitional Metal Compounds Achieved by Multi‐Dimensional Synergistic Nanoarchitecture ». Small, 7 août 2023. http://dx.doi.org/10.1002/smll.202303019.
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AbstractNanostructured transitional metal compounds (TMCs) have demonstrated extraordinary promise for high‐efficient and rapid lithium storage. However, good performance is usually limited to electrodes with low mass loading (≤1.0 mg cm−2) and is difficult to realize at higher mass loading due to increased electrons/ions transport limitations in the thicker electrode. Herein, the multi‐dimensional synergistic nanoarchitecture design of graphene‐wrapped MnO@carbon microcapsules (capsule‐like MnO@C‐G) is reported, which demonstrates impressive mass loading‐independent lithium storage properties. Highly porous MnO nanoclusters assembled by 0D nanocrystals facilitate sufficient electrolyte infiltration and shorten the solid‐state ions transport path. 1D carbon shell, 2D graphene, and 3D continuous network with tight interconnection accelerate electrons transport inside the thick electrode. The capsule‐like MnO@C‐G delivers ultrahigh gravimetric capacity retention of 91.0% as the mass loading increases 4.3 times, while the areal capacities increase linearly with the mass loading at various current densities. Specifically, the capsule‐like MnO@C electrode delivers a remarkable areal capacity of 2.0 mAh cm−2 at a mass loading of 3.0 mg cm−2. Moreover, the capsule‐like MnO@C also demonstrates excellent performance in full battery applications. This study demonstrates the effectiveness of multi‐dimensional synergistic nanoarchitecture in achieving mass loading‐independent performance, which can be extended to other TMCs for electrochemical energy storage.
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Ranjan, Bhanu, et Davinder Kaur. « Pseudocapacitive Storage in Molybdenum Oxynitride Nanostructures Reactively Sputtered on Stainless‐Steel Mesh Towards an All‐Solid‐State Flexible Supercapacitor ». Small, 15 décembre 2023. http://dx.doi.org/10.1002/smll.202307723.
Texte intégralRésumé :
AbstractExploiting pseudocapacitance in rationally engineered nanomaterials offers greater energy storage capacities at faster rates. The present research reports a high‐performance Molybdenum Oxynitride (MoON) nanostructured material deposited directly over stainless‐steel mesh (SSM) via reactive magnetron sputtering technique for flexible symmetric supercapacitor (FSSC) application. The MoON/SSM flexible electrode manifests remarkable Na+‐ion pseudocapacitive kinetics, delivering exceptional ≈881.83 F g−1 capacitance, thanks to the synergistically coupled interfaces and junctions between nanostructures of Mo2N, MoO2, and MoO3 co‐existing phases, resulting in enhanced specific surface area, increased electroactive sites, improved ionic and electronic conductivity. Employing 3D Bode plots, b‐value, and Dunn's analysis, a comprehensive insight into the charge‐storage mechanism has been presented, revealing the superiority of surface‐controlled capacitive and pseudocapacitive kinetics. Utilizing PVA‐Na2SO4 gel electrolyte, the assembled all‐solid‐state FSSC (MoON/SSM||MoON/SSM) exhibits impressive cell capacitance of 30.7 mF cm−2 (438.59 F g−1) at 0.125 mA cm−2. Moreover, the FSSC device outputs a superior energy density of 4.26 µWh cm−2 (60.92 Wh kg−1) and high power density of 2.5 mW cm−2 (35.71 kW kg−1). The device manifests remarkable flexibility and excellent electrochemical cyclability of ≈91.94% over 10,000 continuous charge–discharge cycles. These intriguing pseudocapacitive performances combined with lightweight, cost‐effective, industry‐feasible, and environmentally sustainable attributes make the present MoON‐based FSSC a potential candidate for energy‐storage applications in flexible electronics.