Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 6
·1128-1132
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IF 0.581
Xuqiang Ji,Niu Yusheng,Xu Yuanhong
Abstract The design and development of excellent microwave absorption (MA) material is significant for healthcare, electronic, and security industries. Herein, a sophisticated composite with the advantages of large interlayer space, nanoparticles with small size, and hierarchical nanostructure (core@shell@void@shell configuration) simultaneously is demonstrated for the first time. Such unique SiO 2 @TiO 2 nanoparticle was fabricated via a multi-step process. Associating maximum reflection loss value can reach –35.2 dB in certain frequency of 11 GHz and thickness of 3.0 mm. Small-sized TiO 2 nanoparticles (about 6 nm) in first coating and large gap between TiO 2 coating layers are significantly critical for the superior MA performance. Our work points a new direction to rationally construct high-performance microwave absorber.
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Nanoscale Horizons
·
2018
·Vol. 4
·期 2
·388-395
·
IF 9.391
Ding Zhou,Pengtao Jing,Yi Wang,Yuechen Zhai,Di Li,Yuan Xiong,Alexander V. Baranov,Songnan Qu,Andrey L. Rogach
Aggregation-induced quenching (AIQ) of emission is an obstacle for the development of carbon dots (CDots) for solid-state luminescent devices. In this work, we introduce a method to avoid AIQ and to produce highly luminescent CDots through a space-confined vacuum heating synthesis. In the presence of CaCl2, a mixture of citric acid and urea forms an inflated foam under vacuum heating at 120 °C. Upon gradually increasing the heating temperature to 250 °C, blue emissive molecular species are first formed, and are then transformed into uniform-sized green emissive CDots through dehydration and carbonization processes taking place in the confined ultrathin spaces of the foam walls. The green luminescence of these CDots originates from conjugated sp2 domains, and these CDots exhibit a high photoluminescence quantum yield (PLQY) of 72% in ethanol solution. Remarkably, due to the existence of only one type of recombination center in these nanoparticles, AIQ does not take place in CDot-based close-packed films, which show strong emission with a PLQY of 65%. Utilizing the differences in the emission properties of vacuum heating produced CDots, CDots synthesized through microwave-assisted heating, and commercial green fluorescent organic ink (namely, excitation-dependent vs. excitation-independent emission, and different stability against photobleaching), multilevel data encryption has been demonstrated.
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POLYMER
·
2018
·
IF 3.483
Hui Gao,Jinrong Li,Fang Xie,Yanju Liu,Jinsong Leng
Recently, shape memory polymers (SMPs) with high optical transmittance have been paid great attentions to endow the flexible optoelectronics with shape memory functions. Herein, a low colored and transparent shape memory copolyimide (SMcoPI) is obtained by suppressing the charge transfer complex interactions. The optical transmittance of the synthesized SMcoPI film could reach at ∼86% at the wavelength of 450 nm, far higher than the nearly zero optical transmittance of yellow and brown Kapton H. The better optical transparency could be attributed to the loose molecular chain arrangements induced by the meta -substituted groups and flexible ether linkages. The glass transition temperature ( T g ) range of the synthesized SMcoPI films is from 179 °C to 220 °C, which is higher than that of reported optically transparent SMPs. The effective decomposition temperature at the weight loss of 5 wt% is 517 °C, showing excellent thermal stability. The SMcoPI also demonstrated good shape memory behaviors with high shape recovery ratio ( R r , >96%) and shape fixity ratio ( R f , >97%). In addition, the SMcoPI could maintain high optical transmittance, good thermostability and excellent shape memory behaviors after the ground-stimulated space thermal cycling test for 250 h. The synthesized SMcoPI has application potentials in high temperature areas or optoelectronic devices.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Lan Zhao,Qiqi Hong,Ningning Tan,Xinda You,Biao Huang,Beili Lu,Jianhua Lv,Lirong Tang
Heterostructures comprising zero–dimensional (0D) nanoparticles and two–dimensional (2D) nanosheets have garnered considerable interest for sensing applications. Guanine exhibits extraordinary functionality in terms of their abundant hydrogen bond donors/acceptors. In this study, the protonated amine matrix of guanine serves as augmented active sites, uniformly forming guanine nanoparticles (GN) between 2D vermiculite nanosheets (VMT) confined space. Through electrostatic interactions and cross–linking with heptanedioic acid (HA), a self–assembly heterostructure (GN/VMT–HA) was constructed, which may offer abundant transport channels for enhanced humidity sensing and proton migrations. The proton migrations of GN/VMT–HA increased from 0.585 mS/cm (11% RH) to 0.750 mS/cm (97%RH) at 25 °C. The humidity sensor based on GN/VMT–HA demonstrates excellent performance, including high sensitivity (30.20 Hz/%RH), small hysteresis (1.45% RH) and short response/recovery time (25 s/7 s). This study offers a simple green method for constructing 0D/2D nanocomposites for proton transfer and humidity–sensing applications.
研究领域:
材料科学
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传感器技术
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纳米技术
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xin Kang,Jiancong Liu,Dongxu Wang,Chungui Tian,Honggang Fu
CO 2 hydrogenation to hydrocarbons under high space velocity is crucial for industrial applications, but traditional Fe-based catalysts often suffer from the low activity and poor stability. Herein, we report a new tandem catalyst system combining Pt/TiO 2 catalysts with Fe 3 C catalysts for the direct conversion of CO 2 into C 2 -C 4 hydrocarbons under high space velocity. The Pt/TiO 2 component promotes *CO intermediate production with an enhanced Reverse Water-Gas Shift (RWGS) reaction efficiency, providing a highly reactive species for the Fe 3 C catalyst to achieve Fischer-Tropsch synthesis (FTS). By maximizing the contact interface between the Pt/TiO 2 and Fe-based components through a granule mixing configuration, we achieve significant enhancements in both CO 2 conversion rate (24.0 %) and C 2 -C 4 hydrocarbons selectivity (51.1 %) under the gaseous hourly space velocity (GHSV) of 100000 mL g cat −1 h −1 . Besides, excellent stability is achieved by the tandem catalysts with continuous catalysis for up to 80 h without significant decrease in activity. Through modulation of the reduction states of iron oxide, we effectively tune the composition of Fe-based catalyst, thereby tailoring the product distribution. Through this work, we not only offer a promising avenue for reducing CO 2 for efficient CO 2 utilization but also highlight the importance of catalyst design in advancing sustainable chemical synthesis.
研究领域:
催化化学
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环境科学
·
能源化学
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Journal of Materials Chemistry A
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2024
·
IF 10.7
Rui Zhu,Peng Sun,Guofeng Cui,Yaoguang Yu,Shaojun Ke,Jie Zhao
The exploitation of ion-selective membranes with high power density and low resistance is crucial for harvesting osmotic energy in natural environments. However, the exploration of membranes that synergistically satisfy the demands of these properties in osmotic energy conversion remains largely unresolved. Herein, we demonstrate the application of a negative surface-modified 3D porous poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) hydrogel for osmotic membranes, which effectively improved their deficiencies. Experiments, validation and simulations confirmed that the hydrogel membranes have remarkable space charge-modulated ion transport properties. Consequently, an impressive power output of 6.26 W m−2 can be realized, which exceeds the prevailing commercial standard (5 W m−2). Meanwhile, five device units were connected in series to charge a supercapacitor which exhibited an impressive selectivity rate of 95.6%, coupled with an electrochemical energy conversion efficiency of approximately 45.8%. This research paves a new avenue towards the application of hydrogels in ultra-high performance osmotic membranes.
研究领域:
材料科学
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纳米技术
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能量收集
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电化学
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膜技术
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Molecular Catalysis
·
2024
·
IF 3.9
Liwen Yin,Qianqian Zhang,Hefeng Cheng,Yuanyuan Liu,Baibiao Huang,Peng Wang
Photocatalytic synthesis of carbonyl compounds (aldehydes or ketones) offers great potential for sustained development in the production of pharmaceuticals and fine chemicals. Nevertheless, exploring photocatalysts with high stability, activity, and selectivity remains a significant challenge. In this study, Cs 3 Bi 2 Br 9 (CBB) perovskite nanocrystals have been successfully fabricated by confining the in-situ growth of perovskite CBB within mesoporous molecular sieve SBA-3. The obtained nanocrystals (2–4 nm) possess the advantages of excellent stability, exceptional dispersibility, abundant active sites, and enhanced charge carrier separation capability. Under visible light irradiation and air atmosphere, the CBB@SBA-3 could effectively oxidize benzyl alcohol to benzaldehyde with a total yield of 98.9 μmol, which is 22 times superior to that of bulk CBB, accompanied by a remarkable 99 % selectivity. Comparative experiments and in situ characterizations reveal the roles of electron ( e − ), hole ( h + ), and superoxide radical (·O 2 − ), while successfully capturing the carbon intermediates (·C) during the reaction process, further providing a comprehensive elucidation of the mechanism underlying the conversion of benzyl alcohol to benzaldehyde. This work is expected to provide insights into extending the design and photocatalytic application of Bi-based halide perovskite nanocrystals.
研究领域:
材料科学
·
光催化化学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Kunyu Ji,Wei Li,Yaoyao Wang,Shengchao Yang,Jianning Wu,Zhiyong Liu,Jiayu Yan,Guihua Meng
Solar-driven interfacial evaporation offers a promising solution to freshwater scarcity. However, the confined space restricts light absorption and evaporation area, thereby constraining its operational performance in desalination. In this study, a bilayer aerogel with a mushroom-shaped, umbrella-like structure was developed for desalination. The polypyrrole/polydopamine composite photothermal absorption layer enhances light absorption effectively with its textured surface, while the water transport layer of bacterial cellulose/acrylamide hydrogel provides consistent water delivery via capillary action. Experimental findings indicated that the aerogel attained an evaporation rate of 1.30 kg·m −2 ·h −1 and a solar-to-thermal conversion efficiency of 80.3%. Additionally, the evaporation efficiency was consistent throughout 35 successive testing cycles. The aerogel shows strong potential for application in solar-driven interfacial evaporation desalination. Download: Download high-res image (253KB) Download: Download full-size image
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Small
·
2025
·
IF 12.1
Riliga Wu,Hongyu Dai,Weijiang Guan,Chao Lu
Clusteroluminescence (CL) clusters in the absence of aromatic or π-conjugated structures have emerged as a new family of luminescent materials due to their abundant sources and inherent biocompatibility. However, there is an inborn challenge in controlling the size of CL clusters from random aggregation of micrometers to ordered assembly of sub-10 nanometers. Such an inherent drawback significantly restricts their progress from theoretical research to practical applications. To address this obstacle, a novel approach using space-confined templates is proposed to synthesize CL clusters with tunable sizes. Space-confined templates with sizes of ≈2–6 nm are constructed to effectively confine non-aromatic molecules, yielding size-controllable and luminescence-tunable CL clusters. The versatility of this synthetic strategy is further proved by using non-conjugated molecules, such as L-valine and L-isoleucine. Finally, the potential applications of the synthesized CL clusters have been implemented in cell nucleus imaging owing to their sub-10 nm size and efficient luminescence. The success of this work not only offers a versatile space-confined approach to synthesize size-tunable CL clusters within sub-10 nm, but also opens new avenues for the deployment of CL clusters in advanced applications.
研究领域:
材料科学
·
生物医学工程
·
化学合成
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Haozhi Zhao,Congwei Wang,Quanlong Wang,Chuanyi Chen,Longyu Wang,Rongyu Li,Yongyong Yu,Yuede Pan,Gang Li,Kaiying Wang
Tin-based anodic materials, benefiting from their large theoretical specific capacity and minimal operating potential, are considered high-development potential alternative anodes for lithium-ion batteries (LIBs). Nevertheless, the alloying-dealloying processes between tin (Sn) and lithium ions result in severe volume expansion, which leads to a poorly stabilized solid-electrolyte interface (SEI) layer and resultant inferior cycling performance, posing major obstacles to their commercialization. Herein, a structural regulation strategy was proposed to optimize the interstitial void buffer layer within yolk–shell structures to mitigate the lithiation-associated volume expansion. The tetraethyl orthosilicate-hydrolyzed SiO2 layer was located between Sn and the resin-derived carbon coating, whose thickness could be sophisticatedly optimized via regulating the hydrolysis durations. Following the carbonization and etching, an optimized buffer layer was encapsulated within a protective carbon shell (Sn@Void@C), which could effectively accommodate Sn’s volume expansion during the alloying period, significantly enhancing its performance in electrochemical processes and structural stability. Specifically, the Sn@Void@C anode retained a high specific capacity of 720 mAh g–1 after 400 cycles at 0.2 C and demonstrated an outstanding capacity of 520 mAh g–1 after 500 cycles at 0.5 C. This work provides a facile and effective strategy for rationally designing tin-based anodes for lithium-ion batteries.
研究领域:
材料科学
·
能源存储技术
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120672
·
IF 7.2
Chong Xia,Chengyang Cao,Juan Cheng,Qiming Zhang,Yan Ding,Huan Liu
Nitrophenol compounds are designated as priority-controlled contaminants due to their persistent environmental toxicity. Thermal degradation of condensed nitrophenol under confined space is regarded as an efficient industrial approach, while fire and explosion accidents occasionally occur during disposal. To address this challenge, systematic investigations on the thermal degradation behaviors of o-NP and p-NP were conducted via TG-DSC, FTIR, GC-MS, and two-dimensional correlation spectroscopy (2D-COS). Kinetic parameters were calculated using Kissinger, FWO, and Vyazovkin methods, and reaction models were fitted to clarify degradation mechanisms. Results indicate that decomposition of o-NP is initiated via intramolecular hydrogen bond dissociation, with an average activation energy of 127.9–146.8 kJ/mol, and an F2 reaction model is followed, leading to the product pathway “aromatic intermediates to aliphatic ketones”. In comparison, initiation of p-NP relies on intermolecular hydrogen bond dissociation, with an average activation energy of 153.5–172.9 kJ/mol. The F2 reaction model is maintained throughout, and nitrogen/oxygen-containing aromatic products are readily formed. 2D-COS has confirmed that the sequence of functional group reactions differs significantly due to distinct hydrogen bond types. It is core pathways that while o-NP undergoes intramolecular hydrogen bond formation, followed by nitro-methyl coupling and subsequent C-O reactions, p-NP involves intermolecular hydrogen bond formation, followed by phenolic hydroxyl generation, C-O activation, and ultimately unsaturated bond formation. Targeted safety measures are proposed that thermal temperature of o-NP is controlled at 340–370 ℃ (5–10 ℃/min) to collect aliphatic ketones, and p-NP is maintained at 370–400 ℃, with enhanced tail gas purification and material dispersion implemented to prevent thermal runaway.
研究领域:
环境化学
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热工工程
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危险废物处理
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反应动力学
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分析化学
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yali Feng,Luyan Yang,Yingxing Li,Chuanfang Zhao,Nuermaimaiti Yisimayili,Jinhui Yang,Xincun Dou,Baiyi Zu
The substituent design and photophysical property manipulation are of paramount importance in fluorescent probe design, particularly crucial for chemically inactive molecules that lack reactive functional groups, such as synthetic cannabinoids. Here, a ratiometric fluorescent probe, 2-(5-phenyl-8-(4-(trifluoromethyl)phenyl)pyrimido[4,5-d]pyridazin-2-yl)phenol (DPTF), was selected and synthesized using trifluoromethyl as an electron acceptor for the sensitive and specific detection of one representative synthetic cannabinoid, JWH-018 (1-naphthyl(1-pentyl-1H-indol-3-yl)methanone). The DPTF probe, driven by intermolecular through-space charge transfer (TSCT), exhibits a theoretically calculated limit of detection (LOD) of 2.16 nmol/mL to liquid JWH-018, with low naked-eye detection limits of 101 nmol/mL for liquid JWH-018 and 147 nmol/mL on the porcelain spot plate, and also demonstrates good anti-interference capabilities with 18 substances. The practicability of the probe was further verified through testing E-liquid, urea, artificial saliva, local sewage, and cigarettes, successfully detecting trace amounts of impure JWH-018 in both simulated and real scenarios. Moreover, this work contributes to the probe design methods to understand the photophysical mechanisms that dominate molecular recognition, and we expect that the detection of synthetic cannabinoids is essential for comprehending their epidemiological spread and preventing incidents related to drug-impaired driving or violence.
研究领域:
分析化学
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生物化学
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材料科学
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法医学
·
传感器技术
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