ADVANCED FUNCTIONAL MATERIALS
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2024
·Vol. 34
·期 37
·2402276
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IF 18.5
Xiu He,Xirui Liu,Jiajing Huang,Wenbo Lin,Jiawang Wen,Pochung Huang,Xiaoliang Zeng,Yan Zhang,Qianlong Wang,Yue Lin
Thermal interface materials (TIMs) play a pivotal role in the transfer of heat from high-temperature sources, such as CPUs, to heat sinks in power electronics. The effectiveness of grease-type TIMs is determined by their effective thermal impedance ( R EFF ), which hinges on optimizing both the specific bulk ( R B ) and contact ( R C ) thermal resistances. Achieving concurrent optimization of these resistances poses a significant challenge, especially in high filler loading TIMs, typically above 76 vol%. This research leverages interface engineering through Self-Assembled Monolayers (SAMs) to address this challenge. A substantial decrease in R EFF is realized to 0.169 K cm 2 W −1 , a tenfold enhancement compared to non-SAM treated TIMs, which exhibit R EFF values of 2.265 K cm 2 W −1 . This leap in performance is primarily ascribed to the reduced surface energy of SAM treated Al 2 O 3 , leading to lower particle-to-particle Van der Waals forces, thereby improving particle dispersion and strengthening interfacial bonds. Furthermore, longer carbon chains in SAMs result in increased R B , yet a decrease in R C , due to the chains' capacity for enhanced energy absorption and molecular entanglement. The investigation underscores the significance of shorter-chain SAMs in fine-tuning thermal resistance, highlighting the crucial role of molecular architecture in the design of advanced TIMs.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Qin,Wenhui Yao,Liang Wu,Young-Rae Cho,Fusheng Pan
The conventional slippery liquid-infused porous surfaces (SLIPSs) provide relatively limited corrosion protection and self-healing performance for AZ31 Mg alloys. To this end, 8-hydroxyquinoline (8-HQ) was incorporated into a zirconium-based metal–organic framework UiO-66 through coordination (8-HQ@UiO-66), which was then dispersed into silicone oil to fabricate nanoparticle-enhanced-SLIPSs (8-HQ@UiO-66-SLIPSs). Especially, the influences of 8-HQ@UiO-66 concentration on the surface morphology, surface hydrophobicity, and corrosion resistance were studied. It was found that the surface hydrophobicity first increased and then decreased with increasing concentration, showing the highest water contact angle of 121.2° at a concentration of 1 mg mL–1 (8-HQ@UiO-66-SLIPS-1). This was attributed to the development of well-constructed hierarchical micro/nanostructures. Moreover, it also exhibited the best anticorrosion property, with the lowest corrosion current density of 1.24 × 10–10 A cm–2 and the highest impedance modulus of 9.88 × 108 Ω cm2 at 0.01 Hz, primarily associated with the synergistic interaction of 8-HQ and UiO-66. Further, the self-healing performance was evaluated using the scanning vibration electrode technique (SVET), verifying the superior self-healing performance of 8-HQ@UiO-66-SLIPS-1. Hence, the nanoparticle-enhanced-SLIPSs exhibit considerable potential in the corrosion protection of Mg alloys, thereby accelerating their extensive applications in industry.
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LIQUID CRYSTALS
·
2024
·
IF 2.4
Luan Cui,Jiwei Wang,Guiyang Yan,Fan Liu,Keyi Wang,Yi Diao,Mingda Li,Fanbao Meng
Novel magnetic ionic polymers based on polyvinyl chloride ([PVCs][FeCl4]) with liquid-crystalline (LC) ordering were synthetised and characterised. The [PVCs][FeCl4] containing magnetic tetrachloroferrate ions were prepared with PVC, pyridyl LC monomers and FeCl3. Various devices and instruments were used to characterise the chemical structure, thermal behaviour, magnetic properties, and LC properties. The synthetised [PVCs][FeCl4] showed smectic LC phase and presented excellent thermal stability. Several magnetorheological (MR) fluids were prepared using [PVCs][FeCl4] as particles and silicone oil as carrier fluid. MR Effects and settlement stability were investigated. Under the condition of external magnetic field, the MR fluids showed Bingham flow characteristics, and the MR effect was enhanced with increasing FeCl4− content in the systems. Under the condition of magnetic field intensity of 80 kA/m and shear rate of 2.5 s−1, the magnetorheological efficiency of [PVCs][FeCl4] based MR fluids with particle concentration of 20% can reach up to 14.7. The excellent MR effect of [PVCs][FeCl4] was due to the strong coupling between the magnetic moment of the FeCl4− anion and the orientation of cationic LC primitive under the action of an applied magnetic field. Furthermore, the good settling stability of the MR fluids was due to the introduction of organic mesogens, PVC main-chains and the ionic components for the [PVCs][FeCl4] particles.
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Nano Today
·
2024
·
IF 13.2
Huayang Zhang,Shangzhen Xie,Guangyi Tian,Yihang Zhang,Zhiguang Guo
With global water scarcity a growing problem, fog harvesting technology has emerged as an effective solution. Industrial development and population growth have exacerbated the need for efficient, dismantlable, and assembled fog harvesting devices, as well as the requirement to optimize the droplet capture-transport relationship. In this study, a novel modular bionic 3D tree-like structure for fog harvesting system (3D-TSFHS) was developed to achieve rapid droplet transport by means of Nepenthes-inspired superslip leaves (SSLs). In addition, aluminum (Al) cones with superhydrophilic and superhydrophobic (SHL-SHB) patterns were prepared to enhance the droplet capture efficiency by drawing on the special wettability and structural features of various plants and animals such as cactus, spider silk, desert beetles, lizards and camphor leaves. This artificial design significantly enhances the overall capture and transport relationship. The resulting embedded superslip leaves Al cone fog harvesting (E-SLAC-FH) dramatically improves the fog harvesting efficiency and exhibits excellent durability. Assembling this fog harvesting into a 3D-TSFHS achieves a high fog harvesting efficiency of 0.462 g∙cm −2 ∙min −1 . The system's modular design and its exceptional durability ensure its potential for a wide range of applications in a variety of real-world scenarios.
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Small
·
2025
·
IF 12.1
Yangzi Shangguan,Ranhao Wang,Huan Tang,Shimao Deng,Qiushi Hu,Jiaxin Liang,Huiling Zhou,Xihan Chen,Hong Chen
Photocatalytic antibiotic degradation is an energy-efficient and environmentally friendly approach with the potential for large-scale application but is severely constrained by the lack of efficient and stable catalysts to produce reactive oxygen species (ROS). This research introduces a charge-ordered 3D Fe 3 S 4 -PUF composite integrated into a custom-built photocatalytic tandem continuous-flow cylinder reactor (TCCR) for antibiotic degradation. The system consistently achieves 100% tetracycline (TC) degradation efficiency with Fe 3 S 4 -PUF during 130 h of continuous operation, benefiting from the charge-ordered 3D Fe 3 S 4 -PUF framework and the TCCR design. Mechanism investigations reveal that the abundant Lewis basic ≡SH site and light-induced sustainable Fe 2+ /Fe 3+ redox cycling within Fe 3 S 4 facilitates the production of H 2 O 2 and ROS. Density functional theory (DFT) calculations indicate that Fe 2+ acts as an active site for capturing and activating O 2 , leading to either one-electron (O 2 →O 2 •− →H 2 O 2 →•OH) or two-electron transfer (O 2 →H 2 O 2 ) pathways. Meanwhile, photogenerated electron and the oxygen atoms in H 2 O 2 provide electrons to Fe 3+ , facilitating the reduction of Fe 3+ to Fe 2+ , thus elucidating the Fe 2+ /Fe 3+ redox cycling mechanism. Moreover, the 3D PUF structure enhances the mass transfer and pollutant-ROS interactions. The continuous-flow photocatalytic reaction validate the efficient antibiotic degradation of Fe 3 S 4 -PUF composite, suggesting its potential for implementation in large-scale antibiotic wastewater treatment systems.
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PHYSICS OF FLUIDS
·
2024
·Vol. 36
·期 5
·
IF 4.1
Qiao Du,Li Hongxia,Chen Xuhui,Li Jiahao,Wang Xiyang,Zhao Danyang,Li Honglin,Qian Xuhong
The dynamics of moving contact lines (MCLs) dominate the behavior of capillary-driven microfluidics, which underlie many applications including microfluidic chips. The capillary displacement dynamics in the quasi-static regime has been extensively studied. However, the behavior of MCLs in the dynamic wetting transition regime remains largely unexplored, and previously established MCL dynamic models may be inadequate. In this study, a novel capillary displacement experiment is introduced, which is achieved by reversely introducing microfluidics with surface tension differences, where the one with low surface tension undergoes the wetting transition. In addition, a generalized Navier boundary condition (GNBC)-based model of capillary displacement dynamics is developed within the framework of diffusive interface theory to investigate the MCL dynamics in the wetting transition regime. The oscillation-relaxation process is experienced for phase interface and microscopic dynamic contact angle θ d in the wetting transition regime. Spontaneous filling distance follows d fill * ∼ t 1 / 2 , and reaching quasi-static stage follows d fill * ∼ t 1 . The previously neglected mechanism of inertial-viscous competition dominates the early dynamics of such dynamic wetting transition processes. θ d ∝ u cl is observed to be valid solely under conditions where viscosity dominates, but it breaks down in the presence of dominant inertial effects. An escalation in slip substantially diminishes the influence of inertia, with frictional dissipation mediated by slip emerging as the predominant factor in the capillary-driven early dynamics. The origin of uncompensated Young's stress in the GNBC and its correlation with capillary forces is unified, unveiling the underlying physical mechanism governing the dynamics at the MCL. Finally, by decoupling the analysis of viscosity and slip, a new θ d -viscous-slip formulation is proposed, in agreement with the model predictions.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Qi Cheng,Ma Xudong,Zeng Qi,Huang Zhangwei,Zhang Shanshan,Deng Xiaokang,Kong Tiantian,Liu Zhou
Hierarchical compartmentalization, a hallmark of both primitive and modern cells, enables the concentration and isolation of biomolecules, and facilitates spatial organization of biochemical reactions. Coacervate-based compartments can sequester and recruit a large variety of molecules, making it an attractive protocell model. In this work, we report the spontaneous formation of core-shell cell-sized coacervate-based compartments driven by spontaneous evaporation of a sessile droplet on a thin-oil-coated substrate. Our analysis reveals that such far-from-equilibrium architectures arise from multiple, coupled segregative and associative liquid-liquid phase separation, and are stabilized by stagnation points within the evaporating droplet. The formation of stagnation points results from convective capillary flows induced by the maximum evaporation rate at the liquid-liquid-air contact line. This work provides valuable insights into the spontaneous formation and maintenance of hierarchical compartments under non-equilibrium conditions, offering a glimpse into the real-life scenario.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chen Yang,Zhiguang Guo
The depletion of lubricants in (slippery liquid-infused porous surfaces) SLIPS poses a significant challenge to their long-term functionality. While line-shaped rough structures can mitigate lubricant loss to some extent, they often fail to provide the stability required for sustained performance. In this study, we present a novel porous nanoflower aluminum alloy slippery liquid-infused surface (P-NF-AA SLIPS), which integrates a porous framework with a rough nanoflower structure. This synergistic design offers dual benefits of enhanced oil storage and retention, leading to superior stability and durability. Remarkably, after centrifugation at 7000 rpm, the silicone oil retention of P-NF-AA SLIPS remains between 70–75 % of its pre-centrifugation mass. The surface demonstrates excellent adaptability to prolonged use under varying temperatures and pH levels. In fog collection, P-NF-AA SLIPS demonstrates rapid water droplet capture and detachment, achieving a fog collection efficiency of approximately 0.4 g·min −1 ·cm −2 within 10 min—an improvement of 185.7 % and 68.4 % over the original aluminum alloy (OAA) and superhydrophobic aluminum alloy (SHB-AA), respectively. Additionally, P-NF-AA SLIPS delays icing by 560 s at −15 °C and 231 s at −30 °C, offering remarkable anti-icing and de-icing performance. Furthermore, it demonstrates excellent self-cleaning properties against contaminants such as sand, coffee powder, and dye solutions. P-NF-AA SLIPS has advanced research on SLIPS and supports the application of biomimetic slippery surfaces in fields such as self-cleaning materials, anti-icing and anti-frost coatings, droplet control and transport, as well as biomedical applications.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Ruizeng Luo,Yijie Fan,Yilin Qi,Yuan Bai,Meng Xiao,Yujia Lv,Jinrui Liang,Mingcheng Tang,Jiaping Zhang,Zhou Li,Dan Luo
Endogenous electric field (EF) originating from differences in ionic gradients plays a decisive role in the wound healing process. Based on this understanding, a self-manipulating sodium ion gradient-based endogenic electrical stimulation dressing (smig-EESD) is developed to achieve passive, non-invasive, endogenic electrical stimulation of wounds, which avoids the side effects of electrode occupancy, electrochemical reactions, and thermal effects present in traditional exogenous electrical stimulation. smig-EESD reduced the potential at the center of the wound by specifically absorbing Na+ in the exudate, ultimately strengthening the wound endogenous EF. Importantly, smig-EESD converted the active transport dependent on Na + /K + -ATPase into passive diffusion by adsorbing extracellular matrix Na+, and the saved ATP consumption promoted tissue repair process. smig-EESD regulated innate and adaptive immune responses by upregulating the secretion of multiple cytokines, thereby suppressing injury-associated inflammatory responses and reducing scar formation. smig-EESD reveals an endogenic electrical stimulation strategy that is independent of electrodes and circuits, and provides new insights into the future development of electronic medicine.
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Advanced Science
·
2024
·Vol. 11
·期 44
·2407765
·
IF 14.3
Tianxiang Du,Ning Ma,Zenghui Zhao,Yitong Liu,Xufeng Dong,Hao Huang
The shear yield strength, sedimentation stability and zero-field viscosity of magnetorheological fluids (MRFs) are crucial for practical vibration damping applications, yet achieving a balanced combination of these performances remains challenging. Developing MRFs with excellent comprehensive performance is key to advancing smart vibration damping technologies further. Theoretically, incorporating a multiscale particle system and leveraging synergistic effects between their can somewhat enhance MRFs’ performance. However, this approach often faces issues such as insignificant increases in shear yield strength and excessive rise in zero-field viscosity. In response, this study employs a DC arc plasma method to synthesize a high magnetic permeability, low coercivity submicron FeNi particles, and further develops a novel CIPs-FeNi bidisperse MRFs. The introduction of submicron FeNi particles not only significantly enhances the shear2019 yield strength of MRFs under low magnetic fields but also promotes improvements in sedimentation stability and redispersibility without excessively increasing viscosity. Comprehensive performance analysis is conducted to explore the optimal content ratio, and detailed mechanisms for the enhancement of performance are elucidated through analysis of parameters such as chain-like structure, magnetic flux density and friction coefficient. Most importantly, the superior comprehensive performance combined with straightforward fabrication methods significantly enhances the engineering applicability of the CIPs-FeNi bidisperse MRFs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Jing Wang,Cheng Yang,Jianzhong Jiang
Plant-based proteins have garnered increased attention in recent years due to their unique interfacial properties and biocompatibility. However, their low solubility under neutral pH conditions has always limited their applications. In this paper, oat globulin (OG) (0.01 wt% - 0.05 wt%) could solely stabilize Pickering emulsions with controllable rheological properties at different pH without any modifications. Low viscosity Pickering emulsions (V oil :V water = 1:1) with stability exceeding six months were formed at pH= 2 (221 Pa s) and 12 (109 Pa s), owing to the formation of small OG aggregates (100 nm) with high interfacial activity. Conversely, at pH= 5–10, Pickering emulsions with high viscosity were obtained, where larger-size OG particles aggregated at the oil-water interface. Therefore, the stability, droplet size, and viscosity of the Pickering emulsions stabilized by OG particles could be regulated by pH variation. The strategy harnesses the OG aggregation state at diverse pH levels to engineer emulsions with distinct properties, avoiding the need for chemical grafting modifications, heat, or high-intensity ultrasound treatments, which holds promise for potential applications in functional materials.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Mei Wu,Xin Zhao,Bowen Li,Wenhao Zhang,Hao Zeng,Xuao Zhang,Weichuan Xu,Lingling Bi,Zhiqiang Chen,Jinlong Jiang
Developing rapid, cleaner synthesis strategies for adsorbent preparation through preparative chemistry , and elucidating pore and metal adsorption mechanisms, represent essential goals in achieving highly efficient capture and storage of radioactive iodine in the nuclear industry. This work utilizes solvent-free photopolymerization and one-step photoreduction methods to synthesize hierarchical zeolite Silicaite-1 (denoted as MS-1) and copper-modified zeolite Cu@MS-1, respectively. Focusing on the effects of metal species and pore structure on adsorption performance and mechanisms, their application to radioactive iodine sequestration from spent fuel is evaluated. The findings show adsorption of gaseous iodine by hierarchical zeolite MS-1 is predominantly physical. At 75 °C, it rapidly reaches high equilibrium adsorption capacity (524 mg/g) within 40 min, with faster iodine uptake kinetics than fully microporous zeolites and higher capacity than fully mesoporous silica . Introduction of metallic copper contributes additional chemical adsorption , efficaciously enhancing the MS-1 affinity for gaseous iodine. Cu@MS-1 achieves considerable equilibrium adsorption capacity (520 mg/g) in only 30 min, and improved radioactive iodine retention. The photochemical synthesis approach generates no liquid waste and forms the zeolite framework in 10 min. The obtained hierarchical zeolites MS-1 and Cu@MS-1 have high gaseous iodine capture and storage abilities, opening a new route for rapid and cleaner synthesis of highly efficient radioactive iodine adsorbents.
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