Geopolitics
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2019
·
IF 2.756
Oliver Dunnett
This paper addresses geopolitical cultures of outer space by examining the selected life and works of Arthur C. Clarke (1918–2008), one of the leading space technology advocates of the twentieth century, in the specific context of his adopted home of Ceylon/Sri Lanka. Within the framework of studies that have connected critical geopolitics and science, further discussions concerning the interface between imperialism, technology and tropicality help demonstrate the relevance of Clarke’s geographical imagination to understanding geopolitical cultures of outer space. Three aspects of Clarke’s life and works are examined: First, his underwater exploration activities in Ceylon from the late 1950s to the early 1970s; second, his 1979 Hugo and Nebula Award-winning novel The Fountains of Paradise; and finally, his promotion of Sri Lanka as a future hub of outer space technologies in the early 1980s. The paper suggests that geopolitical readings of outer space can be understood through investigating diverse aspects of place, landscape and identity.
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Nanomaterials
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2019
·Vol. 9
·期 9
·1202
·
IF 4.034
Yan Yu,Yujun Xie,Pan Zeng,Dai Zhang,Rongqing Liang,Wenxing Wang,Qiongrong Ou,Shuyu Zhang
Raspberry-like structure, providing a high degree of symmetry and strong interparticle coupling, has received extensive attention from the community of functional material synthesis. Such structure constructed in the nanoscale using gold nanoparticles has broad applicability due to its tunable collective plasmon resonances, while the synthetic process with precise control of the morphology is critical in realizing its target functions. Here, we demonstrate a synthetic strategy of seed-mediated space-confined self-assembly using the virus-like silica (V-SiO2) nanoparticles as the templates, which can yield gold nanoraspberries (AuNRbs) with uniform size and controllable morphology. The spikes on V-SiO2templates serve dual functions of providing more growth sites for gold nanoseeds and activating the space-confined effect for gold nanoparticles. AuNRbs with wide-range tunability of plasmon resonances from the visible to near infrared (NIR) region have been successfully synthesized, and how their geometric configurations affect their optical properties is thoroughly discussed. The close-packed AuNRbs have also demonstrated huge potential in Raman sensing due to their abundant “built-in” hotspots. This strategy offers a new route towards synthesizing high-quality AuNRbs with the capability of engineering the morphology to achieve target functions, which is highly desirable for a large number of applications.Keywords:gold nanoraspberries (AuNRbs);space-confined effect;tunable plasmon resonances;surface-enhanced Raman scattering (SERS)
研究领域:
材料科学
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纳米技术
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2013
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IF 3.172
Zhifu Liu,Qinghong Zhang,Hongzhi Wang,Yaogang Li
A new type of photonic crystal structural colored fiber was prepared by assembling superparamagnetic chains on the surface of a flexible fiber in a magnetic field under photopolymerization . In this system, fixed structural colors (blue, green, and red) were generated instantaneously. The fiber with multi-stopband can also be prepared by carefully controlling the size of the magnetic spheres in each photopolymerization procedure. This method would be fast and facile for the further study of structural color on the surface of the fiber, and the process may be used to simulate the conventional fiber coloration process.
研究领域:
材料科学
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光学
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LANGMUIR
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2023
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IF 3.9
Yuting Zhu,Kai Li,Qiang Zhang,Yifeng Nie,Tun Yan,Xiaoli Shi,Dong Han
Injectable hydrogels with strong mechanical properties have significant potential for biomedical applications, including the development of electronic skin, intelligent medical robots, as well as tissue engineering. In this study, we report on an injectable hydrogel with notable tensile strength and adhesion properties, achieved through cross-linking thiol-terminated four-arm poly (ethylene glycol) using silver-doped nano-hydroxyapatite, modified with dopamine. Subsequently, the hydrogel was injected in vivo through the perivascular interstitial space of rats. The hydrogel wrapped around the damaged abdominal aortic adventitia, which greatly increases the stress strength of the arterial adventitia. We found that the hydrogel was characterized by excellent biocompatibility, and it induced little immune response over a span of 21 days post-implantation. This simple and minimally invasive vascular protection strategy appears promising for the treatment of vascular diseases, such as abdominal aortic aneurysm (AAA).
研究领域:
生物医学工程
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组织工程
·
血管外科
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CHIRALITY
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2023
·Vol. 35
·期 6
·346-354
·
IF 2
Jiang Huang,Xuefeng Yang,Jin Zhou,Helou Xie,Pengfei Duan
Circularly polarized luminescence (CPL) has been widely demonstrated that the circular polarization in excited state can be significantly amplified through the triplet-triplet annihilation-based upconversion (TTA-UC) luminescence process in various chiral nano-assemblies. However, constructing such an upconverted circularly polarized luminescence (UC-CPL) system in the aqueous phase remains a challenge. In this work, a kind of amphiphilic chiral cationic gemini surfactant is utilized to construct chiral spherical micelle in the aqueous phase, whose internal chiral cavity can provide a hydrophobic and deoxygenated environment for air-sensitive TTA-UC system. In addition, due to the co-assembly process between the emitters and chiral micelles, achiral emitters of upconversion pairs exhibit induced chiroptical properties. More importantly, the luminescence dissymmetry factor ( g lum ) can be amplified by one order of magnitude through TTA-UC process. This work provides an effective and useful strategy for realizing UC-CPL in aqueous phase.
研究领域:
材料科学
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光学
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Chemistry-An Asian Journal
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2019
·Vol. 14
·期 6
·884-889
·
IF 3.698
Tingting Zhang,Zihao Zhao,Huili Ma,Yongming Zhang,Wang Zhang Yuan
Graphical Spatial relations : A pure organic luminogen (AN-MA) with isolated small conjugates and effective through-space conjugation was obtained through facile Diels–Alder cycloaddition. Owing to its flexible structure, two polymorphs were readily obtained. These exhibit bright visible emission and persistent room-temperature phosphorescence ( p -RTP) (see figure). Pure organic luminogens with persistent room-temperature phosphorescence ( p -RTP) have attracted increasing attention owing to their vital significance and potential applications in security inks, bioimaging, and photodynamic therapy. Previously reported p -RTP luminogens normally possessed through-bond conjugation. In this work, we report a pure organic luminogen, AN-MA, the Diels–Alder cycloaddition adduct of anthracene (AN) and maleic anhydride (MA), which possesses isolated phenyl groups and an anhydride moiety. AN-MA exhibits aggregation-enhanced emission (AEE) characteristics with efficiency of approximately 2 % and up to 8.5 % in solution and crystals, respectively. Two polymorphs of AN-MA were readily obtained that were able to generate UV emission from individual phenyl rings together with bright blue emission owing to the effective through-space conjugation. Moreover, p -RTP with a lifetime of up to approximately 1.6 s was obtained in the crystals. These results not only reveal a new system with both fluorescence and RTP dual emission but also suggest an alternative through-space conjugation strategy towards pure organic p -RTP luminogens with tunable emissions.
研究领域:
材料科学
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有机化学
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Nature Communications
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2026
·
IF 18.1
Ding Ruiwen,Qiu Shiwen,Guo Xiaofan,Zhang Min,Liu Yan,Zou Zhiyun,Ying Jianxi,Zhang Meng,Zhang Bingquan,Zhao Yufen
Bioorganic molecules, such as amino acids, nucleobases, and sugars, are widely distributed in space. Here, we utilized the Chinese Space Station to carry out an investigation on the solid-state condensation reactions of these “prebiotic organic molecules” under the combined effects of ionizing radiation and forsterite. Cumulative low-dose ionizing radiation can trigger dipeptide formations and phosphorylation of riboses. Dipeptide yields increased 41-fold due to the synergistic effect of forsterite plus sodium trimetaphosphate (P 3 m). P 3 m is activated upon irradiation to phosphorylate nucleosides into nucleotides. Under ionizing radiation, forsterite can promote hydroxyapatite to serve as an accessible phosphorus source for activating amino acids to form peptides. These findings indicate that complex biomolecules can be formed abiotically in space through ionizing radiation activation with the assistance of forsterite in certain radiation - resistant environments distant from planetary surfaces. It implies that apart from transporting prebiotic organic molecules to Earth, space can also provide opportunities for the in-situ assembly of ordered biomolecules from these disordered materials.
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Small Science
·
2024
·Vol. 4
·期 11
·2400241
·
IF 11.1
Mingli Liu,Shuai Liu,Jian Yao,Yu Teng,Lin Geng,Alei Li,Lin Wang,Yunfei Li,Qing Guo,Zongjie Shen,Lixing Kang,Mingsheng Long
In recent years, wide-bandgap semiconductor β-Ga 2 O 3 material has been widely studied because of its excellent properties. Simultaneously, 2D metal oxides (2DMOs) have also become a focus of research owing to their superior stability and unique physical properties arising from quantum confinement effects. Therefore, the exploration of 2D β-Ga 2 O 3 is expected to reveal its novel electrical properties in electronic applications. However, the synthesis of high-quality 2D β-Ga 2 O 3 remains a formidable challenge. Herein, a confined space is constructed to synthesize high-quality 2D β-Ga 2 O 3 nanoflakes by enhancing the control of the kinetics of chemical vapor deposition process. In the device results, it is shown that the grown nanoflakes have excellent switching properties and potential artificial synaptic response characteristics. Based on this premise, an artificial recognition system for handwritten numerals is developed, achieving a peak recognition accuracy of approximately 96%. This system holds significant potential for application within an emerging neuromorphic recognition framework tailored for advanced driver-assistance systems. In this work, a new feasible pathway is provided for the synthesis of 2D non-layered oxides and the potential of 2D oxides in the field of neuroanalog electronics and recognition is shown, thereby advancing the fields of 2D β-Ga 2 O 3 electronics and 2DMOs electronics.
研究领域:
材料科学
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电子工程
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神经网络
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CERAMICS INTERNATIONAL
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2026
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IF 6
Biao Yi,Guangfan Tan,Yanwei Huang,Dajun Xu,Yingjie Guo,Yingchun Zhang
Lithium hydride (LiH) is a neutron shielding material for space nuclear reactors, but research on its preparation, processing, and functional integration remains limited. This study systematically investigates the preparation process and properties of LiH ceramics to evaluate their potential application in neutron shielding systems for space reactors. Green bodies were prepared via cold pressing and sintered at 500°C, yielding highly dense (98%) ceramics with closed pores, uniformly distributed grains (3–5 μm), stable microstructure, and no significant cracks. Mechanical testing revealed compressive strength reaching 180.67 MPa and flexural strength of 35.21 MPa at the optimal sintering temperature. Thermal performance tests indicated that the ceramic's thermal conductivity exceeded that of the green body and exhibited a decreasing trend across a broad temperature range from room temperature to 500°C, demonstrating stable and predictable thermal behavior. Both MCNP simulations and experimental measurements using a 252 Cf neutron source confirm that thin-layer LiH ceramics achieve over 90% shielding efficiency for low to medium energy neutrons and demonstrate significant shielding effects for fast neutrons. Comprehensive analysis indicates that LiH ceramics can simultaneously achieve high density, excellent mechanical and thermal properties, and outstanding neutron shielding capability. This provides reliable process guidance for the design and application of shielding materials.
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ACS Applied Optical Materials
·
2026
·
IF 3.4
Dong Liu,Shuyi Zhang,Luzong Jing,Hao Wang,Guanwen Chen,Longfei Xu,Hongqiang Song,Xiangliang Kong,Zhongchen Wu,Yao Chen
The rapid expansion of commercial spaceflight is driving space X-ray detectors toward ultimate cost-effectiveness. Compared with conventional semiconductors, metal halide perovskites, with superior optoelectronic properties and low-cost solution processability, are promising candidates for space radiation detection. Herein, we first synthesized Nd-MAPbBr3 single crystals, with Nd3+ causing lattice contraction and thus improving the crystal tolerance factor. We uncover a correlation between color evolution and crystallization, with the precursor solution turning purple from colorless after adding NdBr3 and yellowing during crystallization due to methylamine oxidation. The fabricated planar Nd-MAPbBr3 X-ray detector exhibits a sensitivity of 162.64 μC Gy–1 cm–2 and a detection limit of 4 μGy s–1 under a low electric field of 20 V cm–1. Notably, after cumulative X-ray irradiation of 320 mGy, the sensitivity of the Nd-MAPbBr3 detector improves by 33.75%, demonstrating superior radiation tolerance. These results highlight Nd-MAPbBr3 single crystals as a promising material for space X-ray detection.
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ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Jie Zeng,Lei Xie,Tianyi Liu,Yanjun He,Weiyan Liu,Qing Zhang,Junyan Li,Xiaofeng Li,Beilei Qiu,Shan Zhou,Qirui Liang,Xudong Wang,Kang Liang,Jinyao Tang,Jian Liu,Lei Jiang,Gang Huang,Biao Kong
In the field of sustainable chemistry, it is still a significant challenge to realize efficient light-powered space-confined catalysis and propulsion due to the limited solar absorption efficiency and the low mass and heat transfer efficiency. Here, novel semiconductor TiO2 nanorockets with asymmetric, hollow, mesoporous, and double-layer structures are successfully constructed through a facile interfacial superassembly strategy. The high concentration of defects and unique topological features improve light scattering and reduce the distance for charge migration and directed charge separation, resulting in enhanced light harvesting in the confined nanospace and resulting in enhanced catalysis and self-propulsion. The movement velocity of double-layered nanorockets can reach up to 10.5 μm s–1 under visible light, which is approximately 57 and 119% higher than that of asymmetric single-layered TiO2 and isotropic hollow TiO2 nanospheres, respectively. In addition, the double-layered nanorockets improve the degradation rate of the common pollutant methylene blue under sustainable visible light with a 247% rise of first-order rate constant compared to isotropic hollow TiO2 nanospheres. Furthermore, FEA simulations reveal and confirm the double-layered confined-space enhanced catalysis and self-propulsion mechanism.
研究领域:
材料科学
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可持续化学
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纳米技术
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shu-Yan Wang,Ming-Wei Mao,Ke Wang,Zhan-Zu Feng,Ru-Han Ma,Yu-Long Tang,Qiang Wang,Hao-Li Zhang
Space exploration is inseparable from advanced antiradiation materials with exceptional properties. Among these, nonlinear optical materials and devices, such as irradiation-resistant saturable absorbers (SAs), have garnered significant attention, particularly due to their critical role in integrated photonics for space use. This study presents a comprehensive evaluation of the space adaptability of two-dimensional (2D) W2N3 under simulated space radiation conditions. When subjected to 60Co γ-ray irradiation at doses exceeding 45 years of accumulation in a typical low-Earth orbit, W2N3 retained its robust third-order nonlinear saturable absorption across the visible- to near-infrared spectral range. Femtosecond transient absorption spectra offer a comprehensive view of the carrier dynamics of W2N3 before and after irradiation, delving into radiation effects and damage mechanisms that are otherwise elusive to conventional techniques. The synthesized W2N3 nanosheets were successfully employed as efficient SAs for Q-switched mode-locking in a Yb-doped fiber laser. The laser system operated at ∼1 μm NIR with high pulse energy and low saturation power, highlighting the remarkable potential of W2N3 for integration into lasers, modulators, and other photonic devices. Notably, the irradiated W2N3 demonstrated an identical mode-locking performance compared to its pristine counterpart. These findings provide valuable guidance for the rational design and screening of nonlinear optical materials capable of withstanding space radiation, offering significant implications for future space-based photonic applications.
研究领域:
材料科学
·
光学
·
光子学
·
空间技术
·
凝聚态物理
·
纳米技术
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