Article
Physics, Particles & Fields
Netta Engelhardt, Asmund Folkestad
Summary: The consistency of the holographic dictionary leads to a hallmark prediction of the weak cosmic censorship conjecture: trapped surfaces in classical gravity lie behind event horizons. The formation of event horizons outside of a strong gravity region is a direct consequence of causal wedge inclusion required by entanglement wedge reconstruction. This study suggests spacetimes with naked trapped surfaces do not have a holographic dual and speculates on the dual CFT interpretation of a trapped surface.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alvaro Duenas-Vidal, Jorge Segovia
Summary: The lightlike limit of boosted black hole solutions with one angular momentum in D >= 4 dimensions is investigated. Boost is performed parallel to the angular momentum and the lightlike limit is achieved through perturbative expansions. It is shown that the lightlike limit cannot extend inside the ring singularity for D = 4 and D > 5. In the case of D = 5, the emergence of trapped surfaces in head-on collision is discussed. It is found that, within the performed perturbative analysis, a trapped surface with the topology R x S1 x S1 seems to appear over the past light cone of the collision below a critical value of the Kerr parameter.
Article
Nanoscience & Nanotechnology
Fangwei Guo, Fei Pan, Wenchen Zhang, Tian Liu, Flavia Zuber, Xing Zhang, Yali Yu, Ruiji Zhang, Markus Niederberger, Qun Ren
Summary: The increased occurrence of antimicrobial resistance poses a significant burden on patients, the healthcare system, and society. This study proposes a new strategy of developing antimicrobial materials by doping rare earth elements. An antibacterial film containing CeO2-x-TiO2, xanthan gum, poly(acrylic acid), and hyaluronic acid is designed, with CeO2-x-TiO2 integrated into a hexagonal grid for transparency. The antibacterial film demonstrates high efficacy against Staphylococcus aureus and Escherichia coli, as well as excellent antifog performance. The study also reveals the involvement of reactive oxygen species (ROS) and Ce3+ ions in the antibacterial activity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Tun Naw Sut, Sigalit Meker, Dong Jun Koo, Joshua A. Jackman, Nam-Joon Cho
Summary: In this study, the effect of solution pH and ionic strength on the adsorption behavior of DOCP lipid vesicles on titania and silica surfaces was systematically investigated. The results showed that the adsorption behavior of DOCP lipid vesicles on these surfaces was opposite to that of conventional phosphocholine lipids. The interplay of solution pH and ionic strength was found to modulate the adsorption behavior of DOCP lipid vesicles, providing insights for the fabrication of stabilized inverse-phosphocholine lipid bilayers on oxide surfaces.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Wessel van den Bergh, Eric R. Williams, Natalie Alicia Vest, Pei-Hua Chiang, Morgan Stefik
Summary: Mesoporous microparticles are an attractive platform for deploying high-surface-area nanomaterials and their performance depends on structural dimensions. This study introduces a new method to control parameters, successfully adjusting skin layer thickness, and demonstrates independent tuning of pore size and wall thickness using persistent micelle templates.
Article
Mechanics
Sang Min Baek, Won Jun Lee, Sang Yong Kim, Seong Su Kim
Summary: This study conducted a characterization of a honeycomb-shaped absorber and determined the range of relative permittivity to increase the absorption bandwidth. The research also verified the utility of a film-based honeycomb absorber that can maintain broadband absorptivity continuously.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Edy Riyanto, Ahmad Dedi, Ahmad Fudholi, Guo Ying, Zhang Jing, Jianjun Shi, Gaoshan Huang, Yongfeng Mei
Summary: Atomic layer deposition (ALD) was used to coat a polyethylene terephthalate (PET) polymer substrate with TiO2 film. The thickness of ALD deposition influenced the coverage of TiO2 film on the surface. The presence of reactive sites of -C=O on the PET surface played a significant role in facilitating the initial ALD growth of the TiO2 film. Increasing the TiO2 film thickness led to higher Ti element content. Diffusion growth and direct coordination through precursor coordination with surface reactive sites of -C=O occurred simultaneously in the initial growth of TiO2 coating onto PET polymer by ALD. The surface alteration of the TiO2 ALD film was characterized by the emergence of hydroxyl -OH groups.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Physical
Anupam Bera, Denise Bullert, Matthias Linke, Steffen Franzka, Ulrich Hagemann, Nils Hartmann, Eckart Hasselbrink
Summary: The study investigated the interaction between 2-propanol and SrTiO3(100) surfaces, focusing on the role of different surface terminations in the deprotonation process upon adsorption. AFM, ARXPS, and SIMS confirmed the preferential presence of SrO and TiO2 terminations. Surface sensitive vibrational sum frequency spectroscopy (vSFS) showed that 2-propanol predominantly adsorbs intact on SrO-terminated SrTiO3(100), but undergoes significant deprotonation on TiO2-terminated SrTiO3(100), in contrast to the lack of deprotonation observed when interacting with thin film TiO2, as reported previously.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Sachin Surve, M. K. Banerjee, Kanupriya Sachdev
Summary: ZnO thin films were fabricated using RF-sputtering deposition technique on Si and Glass substrate, and employed as the active semiconductor material in TFTs. The TFTs were structured with a bottom gate and top contact electrode, utilizing high-k TiO2 as the gate insulator.
MATERIALS TODAY-PROCEEDINGS
(2021)
Article
Nanoscience & Nanotechnology
Huan Zhang, Shijia Yang, Zhusheng Yang, Dong Wang, Juanjuan Han, Cuihua Li, Caizhen Zhu, Jian Xu, Ning Zhao
Summary: In this study, a polymer network with extreme stretchability, high mechanical strength, and self-healing capability was successfully constructed by synergistically incorporating metal-ligand and hydrogen bonds. The representative specimen showed remarkable mechanical properties superior to previously reported materials, and tunability of mechanical properties and self-healing capability was achieved by simply modifying the content of a chain extender. The application of the supramolecular polymer network in constructing a flexible and self-healable conductor was demonstrated, providing insights for preparing extremely stretchable and self-healable polymeric materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Guangda Zhu, Yi Hou, Junfeng Xiang, Jian Xu, Ning Zhao
Summary: Dynamic polymers cross-linked by ionic bonding and hydrogen bonding are reported for digital light processing (DLP) 3D printing. These polymers endow printed objects with excellent self-healing and recycling ability, and the mechanical properties can be easily tailored for practical applications. The dynamic cross-linking allows for various assembling categories and functional devices with a self-healing capacity to be realized.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Yi Hou, Guangda Zhu, Jie Cui, Ningning Wu, Bintao Zhao, Jian Xu, Ning Zhao
Summary: A hard but reversible Si-O-Si network was developed as the basis for a coating with excellent transparency, hardness, flexibility, and quick self-healing properties by filling soft polymeric micelles into hard poly(silsesquioxane) networks. This hybrid composition provides materials with excellent comprehensive functions without trade-offs between properties, including high hardness, flexibility, and rapid self-healing ability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Polymer Science
Guangda Zhu, Yi Hou, Jian Xu, Ning Zhao
Summary: Researchers have improved the mechanical properties of DLP printed objects by introducing linear polymers into commercial resins and using heat treatment to enhance interlayer adhesion. This simple strategy not only retains the printability of DLP, but also increases the strength and toughness of the printed objects.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Polymer Science
Lei Tian, Yanxing Liu, Dai Wang, Jiji Tan, Yankun Xie, Bei Li, Qiuyu Zhang, Caizhen Zhu, Jian Xu
Summary: This article reports on a swelling-induced self-assembly method for controlled colloidal clusters using a click seeded emulsion polymerization. The driving force is liquid bridging, and colloidal clusters with tunable structures can be prepared by regulating the formation of liquid bridges. Moreover, it is possible to transform patchy particles into clusters by changing the seed concentrations.
Article
Nanoscience & Nanotechnology
Meng Yang, Heng Luo, Weizhi Zou, Yong Liu, Jinhao Xu, Jing Guo, Jian Xu, Ning Zhao
Summary: A one-pot method was used to regulate the hydrated structure and wettability in a hierarchical porous hydrogel, resulting in optimized water bonding network in an evaporator for efficient solar-driven vapor generation. The hydrophobic walls of the air pores in the foam provide vaporization sites and reduce heat loss, while the hydrophilic skeleton with secondary pores effectively pumps capillary water. The proportion of intermediate water in the foam reaches 87.6%, contributing to exceptional evaporation rate and robust solar-driven vapor generation performances.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Heng Luo, Meng Yang, Jing Guo, Weizhi Zou, Jian Xu, Ning Zhao
Summary: This article presents a fast, inexpensive, and scalable UV-curing method to fabricate porous polymer coatings with superior infrared emittance and solar reflectance, resulting in significant temperature drops during the night and under solar intensity in the metropolitan area in summer. The UV-cured coating is highly cross-linked and superhydrophobic, showing excellent durability after long-term UV irradiation, thermal aging, or immersion in corrosive chemicals.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Weizhi Zou, Heng Luo, Meng Yang, Jian Xu, Ning Zhao
Summary: In this study, a new method for preparing polyethylene-polysilicate all-polymer porous coatings was developed. The coatings possess an optimized skeleton structure, high volume fraction, and balanced optical and mechanical properties. These porous coatings exhibit significant mechanical robustness, durability, optical properties, and PDRC performance.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Weizhi Zou, Zhen Wang, Zhenchao Qian, Jian Xu, Ning Zhao
Summary: Vat-photopolymerization-based 3D printing is combined with the sol-gel process to produce advanced functional materials with complex shapes and hierarchical pore structures. Programmable post-printing processes enable the production of high-performance and multifunctional interpenetrating phase nanocomposites. This study provides new guidelines for the design and fabrication of novel materials by additive manufacturing.
Article
Chemistry, Multidisciplinary
Yong Liu, Weizhi Zou, Meng Yang, Heng Luo, Shijia Yang, Jian Xu, Ning Zhao
Summary: In this study, a PBO film is prepared using PBO nanofibers as building blocks through a sol-gel-film conversion and annealing method. The polymer film shows a high thermal conductivity (36.7 W mK(-1)), which is significantly higher than most polymers and even 304-stainless steel. The high thermal conductivity is attributed to the highly oriented 3D interconnected nanofiber network resulting from the sol-gel-film conversion and annealing, along with other excellent properties of the PBO film.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yong Liu, Ning Zhao, Jian Xu
Summary: With the rapid development of portable and wearable electronic devices, there is an urgent need for flexible and robust thermally conductive electromagnetic interference shielding materials. In this study, multifunctional composite papers consisting of poly(p-phenyl-2,6-phenylene bisoxazole) nanofiber, boron nitride nanosheet, and Ti3C2Tx MXene nanosheet were prepared using a gel microparticle-mediated assembly process. The composite papers exhibited excellent EMI shielding performance, thermal conductivity, mechanical properties, and thermal stability, making them highly advantageous for practical applications in electronic devices.
ADVANCED FIBER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shijia Yang, Wenxing Liu, Jing Guo, Zhusheng Yang, Zhi Qiao, Chenguang Zhang, Jikun Li, Jian Xu, Ning Zhao
Summary: The recycling of thermosetting polymers, which cannot be reprocessed due to their covalently cross-linked structures, can be achieved through the implantation of dynamic covalent bonds. This study demonstrates the direct and catalyst-free ester metathesis of N-acyloxyphthalimide (NAPI) and its use in the creation of covalent adaptable networks (CANs). The NAPI metathesis reaction shows interesting kinetics, proceeds via a free radical chain mechanism, and allows for fast associative exchange at low dissociation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Yong Liu, Weizhi Zou, Ning Zhao, Jian Xu
Summary: This study prepared a poly(p-phenylene-2,6-benzobisoxazole) (PBO)/MXene nanocomposite film with excellent mechanical and thermal properties using a sol-gel-film conversion method. The resulting film showed electrically insulating properties, high thermal conductivity, thermal stability, and flame retardancy, providing new ideas for constructing high-performance thermally conductive but electrically insulating composites.
NATURE COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Wenxing Liu, Shijia Yang, Lei Huang, Jian Xu, Ning Zhao
Summary: The design of responsive materials using dynamic covalent bonds has gained significant attention in recent years. This article provides an overview of the mechanisms and experimental elements influencing the dynamic features of isocyanate-based bonds (IBs). It also discusses the construction strategies of dynamic covalent polymers and their applications in various fields.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Yuanyi Luo, Ludi Shi, Huanze He, Guangtao Cong, Caizhen Zhu, Jian Xu
Summary: The nitrogen-doped carbon-coated Co9S8-Co1-xS yolk-shell hollow spheres were synthesized as a promising anode material for sodium-ion batteries, which demonstrated improved rate capability, cycling stability, and large sodium-ion storage capacity due to its unique hollow nanostructure. The combination with an advanced electrode also showed highly stable specific capacity and reversibility, making it a potential candidate for high-performance sodium-ion battery applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
