ACS Omega
·
2024
·
IF 3.7
Hongmei Zhong,Ting Meng,Wenxiang Ding,Yi Xiao,Peng Zhang
Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation. Nevertheless, optimizing NaCl particle size, and thus the polymer pore size to enhance scattering capabilities remains a challenge. Here, we report a simple, scalable, and sustainable approach to creating an optimized porous polydimethylsiloxane (PDMS) film. This approach utilizes ultrafine NaCl powders as sacrificial templates, which were synthesized via ultrasonic precipitation to ensure their small size. The ultrafine NaCl particles have a size distribution centered around 6–8 μm, and the as-fabricated porous PDMS film achieves a high thermal emissivity of 0.95 within the atmospheric window (8–13 μm) and exhibits a reflectivity of 0.95 within the visible range (0.4–0.78 μm). Due to the desired dual-spectrum properties, the porous PDMS film exhibits a superior subambient cooling capacity over that fabricated with typically larger NaCl particles under strong sunlight. This study offers a scalable and practical radiative cooling solution for sustainable thermal management.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Ding,Yufeng Zhou,Ziyao He,Qingyun He,Xiaojuan Liang,Wei Xia,Weidong Xiang
All-inorganic perovskites have been considered next-generation color converters in the backlit due to their shining optical properties. However, structural instability severely limits their pragmatic applications. Here, CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) were successfully embedded in polydimethylsiloxane (PDMS) films by a facile two-step method. As-prepared PDMS films containing CsPbBr 3 /Cs 4 PbBr 6 MCs (CsPbBr 3 /Cs 4 PbBr 6 @PDMS) obtain high brightness and excellent stability. Meaningfully, the PDMS films not only serve as a double protective matrix that can be used to improve the stability of CsPbBr 3 /Cs 4 PbBr 6 MCs, but also a flexible substrate with high transparency that allows the CsPbBr 3 /Cs 4 PbBr 6 @PDMS films to be used as color conversion materials for backlit displays. To our surprise, when PDMS is coated with CsPbBr 3 /Cs 4 PbBr 6 MCs, the water, thermal and photostability are greatly improved, while the photoluminescence intensity only lost by 10%. Furthermore, by mixing CsPbBr 3 /Cs 4 PbBr 6 MCs with K 2 SiF 6 :Mn 4+ phosphors in PDMS, a monolithic film with high performance was obtained. Its color gamut can reach 127% of the NTSC 1953 standard and 95% of the REC. 2020 standard, exhibiting the bright prospects in the backlit display field.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fang Xu,Dainan Zhang,Yulong Liao,Fei Xie,Huaiwu Zhang
In this work, LiZnTiBi ferrites with high permeability (∼142@1 MHz, ∼13@1 GHz) over a wide frequency range were synthesized at low temperature. Next, the ultrafine ferrite particles were obtained by grinding, centrifugation and ultrasonic method. The flexible PDMS-based film was prepared by dispersing the ferrite particles into PDMS film by a fast curing method. The high frequency magnetic and dielectric properties of the flexible films with various ferrite particles were investigated. Results demonstrated that effect of ferrite particles on permittivity ( ε′ ) can be weakened by residual air bubbles in the flexible film, which leads to measured value lower than calculated value. Due to same permeability ( μ ′= 1) of PDMS and air bubbles, the residual bubbles have a little effect on permeability of flexible film. At last, a flexible PDMS-based film with desirable normalized characteristic impedance (Z/Z 0 = 0.95η 0 ) and miniaturization factor (n = 5.26) at 100 MHz was obtained, which can be applied to miniaturized flexible antenna. Moreover, the strategy that introducing magnetic particles and a small amount of pores into flexible film to adjust magnetic-dielectric properties is also a reference for developing other high-frequency materials for flexible electronics, especially for wearable electronics.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 2
·238
·
IF 2.881
Xiaoming Feng,Huiying Guan,Ze Wang,Shichao Niu,Zhiwu Han
Transparent materials with antifogging and self-cleaning ability are of extreme significance for utilization in outdoor solar cell devices to alleviate the performance loss and maintenance costs. Herein, with inspiration from the anti-wetting surfaces in nature, regular papillae-like microstructure arrays (PMAs) inspired by lotus leaves were designed via a common UV lithography combined with a soft replication. Subsequently, the biomimetic slippery polydimethylsiloxane (PDMS) film (BSPF) inspired by the pitcher plant was fabricated successfully by infusing with hydrophobic liquid lubricant. The resultant surface has hydrophobic surface chemistry, a slippery interface, PMAs structure. The wettability, optical characteristic, antifogging property and self-cleaning ability of the PMAs-based BSPF were characterized experimentally. The film displays excellent optical transmittance, antireflection, antifogging, and self-cleaning properties, which is superior to the flat PDMS film (FPF). Remarkably, an average reflection of ∼11.3% in the FPF was reduced to ∼8.9% of the BSPF. In addition, after gradient spray test for 120 s, the antifogging efficiency was close to 100% for the BSPF surface in comparison with the flat PDMS film (FPF), biomimetic PDMS film (BPF) and flat slippery PDMS film (FSPF) (35%, 70% and 85%). Furthermore, we also discovered that the BSPF surface exhibited a better self-cleaning performance toward a variety of liquids than solid dust.Keywords:biomimetic PDMS film;antifogging;self-cleaning;papillae-like microstructures;slippery surfaces
研究领域:
材料科学
·
表面工程
·
仿生学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Ziju Wang,Lulu Yang,Shuzheng Zhang,Wenlong Hu,Chaojie Hu,Bin Yang
s To overcome the disadvantages such as local stiffness/strength reduction caused by the embedded sensors in composites structures used for structural health monitoring , we designed a surface pasting film sensor (SPFS) to locate the impact damage in glass-fiber reinforced polymer (GFRP) panels and composite overwrapped pressure vessel (COPV). The SPFS was made by printing MWCNTs/PDMS ink onto a PDMS film substrate. The relative resistance response (Δ R / R 0 ) of the sensing networks was recorded during loading. Sensing performance of SPFSs was evaluated by monitoring damages in GFRP panels with three different thicknesses and assessing three typical positions within a COPV. The experimental results demonstrated that variations in the load magnitude and position can be estimated by Δ R / R 0 shift of the SPFS. The newly designed SPFS shows superior accuracy in in-situ detecting damages in FRP structures. The maximum root mean square error for damage localization is 4.45% in GFRP panels and 4.27% in COPV. The presented concept provides a novel approach for early detection of damages in FRP structures, offering advanced warning without disrupting their inherent integrity.
研究领域:
材料科学
·
结构健康监测
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产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Xiangyu Fan,Hao Zhang,XinRu Zhao,Ke Lv,Tiying Zhu,Yaping Xia,Cheng Yang,Chengjie Bai
Three-dimensional (3D) SERS substrate with the denser “hotspots” is synthesized by the constriction of PDMS film decorated with sandwiched [email protected] @graphene ( [email protected] @G) nanostructure . Graphene layers above and below the AgNPs are used to absorb molecules onto the “hotspots”, and prevent the oxidation of AgNPs in our design. PDMS films can be easily shrunk for 3D structures, causing advantages in enhancement ability and light-matter interaction. Benefiting from the above advantages, a detection limit of 10 −14 M (CV) and enhancement factor (EF) of 3.9 × 10 9 were obtained in our experiment. Theoretical analyses (FDTD) were also used to study the enhancement mechanism. For practical purposes, in-situ detection of MG molecules on the fish surface and the label-free detection of DNA base of adenine (A) and cytosine (C) were also studied. The high enhancement factor, great sensitivity, reliability, and stability of substrate reasonably proved that it can be used as an excellent SERS substrate for biomolecular detection.
研究领域:
材料科学
·
生物传感
·
光学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Meng Sun,Houjia Zhang,Hefu Li,Xuehui Hao,Changzheng Wang,Lijun Li,Zhenshan Yang,Cunwei Tian
Flexible and transparent surface-enhanced Raman scattering (SERS) substrates have attracted much attention as a fast, sensitive and in situ detection platform for practical applications. However, the large-area fabrication of flexible and transparent SERS substrates with high performance is still challenging. Here, a flexible and transparent SERS substrate based on large-area thin PDMS film decorated with Ag microlabyrinth/nanoparticles hierarchical structures (denoted as ALNHS@PDMS) is fabricated by using the floating-on-water method and magnetron sputtering technology. By optimizing the sputtering time, the ALNHS with multiple hot spots are uniformly distributed on the PDMS surface. Based on characterizing the rhodamine 6G (R6G) with a portable Raman spectrometer, the optimal ALNHS@PDMS film exhibits a high enhancement factor (5.2 × 10 6 ), excellent uniformity and reproducibility, as well as superior mechanical stability. In addition, thanks to the good sticky feature and bi-directional activation property of the thin ALNHS@PDMS film, the prepared flexible and transparent SERS substrate can achieve in situ detection of malachite green residues (10 -6 M) on apple and tomato skins. This large-area, thin, mechanically robust, flexible and transparent ALNHS@PDMS film, integrated with a portable Raman spectrometer, shows great potential for point-of-care testing (POCT) in practical applications.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kechen Zhang,Haojing Xu,Yuhe Shao,Zaisheng Wen,Ting Wang,Mingyue Chen,Zhen Song,Quanlin Liu
Achieving excitation-free, long-range target surveillance under complete darkness remains a critical challenge for night-vision technology. Here, a breakthrough is reported in near-infrared (NIR) persistent luminescence (PersL) materials designed specifically for this frontier. Through strategic bandgap engineering via Sm 3 ⁺ co-doping and In 3 ⁺ solid-solution incorporation in the novel Cr 3 ⁺-doped Mg 3 Ga 1.9 In 0.1 SnO 8 spinel phosphor, the afterglow intensity and duration are dramatically enhanced. The optimized material exhibits an ultra-long NIR PersL exceeding 168 h. Crucially, PDMS films embedded with this phosphor enabled real-time, persistent target detection at an unprecedented distance of 47.5 m in complete darkness, entirely without any external excitation source. This record-setting long-range performance demonstrates the material's potential as an enabling technology for passive, long-range nighttime surveillance systems. Comprehensive spectroscopic studies elucidate the underlying PersL mechanism. This work establishes a new pathway for designing ultra-long NIR PersL materials and paves the way for advanced applications in remote night-vision technologies.
研究领域:
材料科学
·
光学材料
·
光子学
·
夜视技术
·
远程传感
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jun Cai,Zhenhu Wang,Mengjiao Wang,Deyuan Zhang
Surface-enhanced Raman spectroscopy (SERS) is to date a popular detection technology in chemistry, materials science, and medical research with growth potential to provide powerful sensing capabilities. However, there are still great challenges to design and fabricate reliable SERS substrate featuring good reproducibility and high sensitivity. Herein, we demonstrated a bio-templating approach to fabricate SERS substrate, using nanoimprint technique for replicating delicate hierarchical patterns of diatom frustules onto PDMS film, followed by sputtering Au nanoparticles. The minimum diameter and height of the nano-pillars on the substrate were ~ 40 nm and ~ 25 nm, respectively, which were identified with the dimensions of the nanopores on diatom frustules. The diameter and gap of the deposited Au nanoparticles could be changed by varying sputtering duration. The as-fabricated SERS substrate showed a high detection sensitivity (enhancement factor ~ 2.24 × 10 7 ) with good Raman signal reproducibility for the probe molecule Rhodamine 6G (relative standard deviation of the intensity at 612 cm −1 < 20%). More importantly, the limit of concentration (LOC) of the probe molecule reached as low as 10 −11 M. For extending the SERS substrate fabricated in this research to the potential applications including food safety, the SERS performance of Carbendazim was conducted and the LOC reached 10 −7 M.
研究领域:
材料科学
·
化学
·
纳米技术
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Bionic Engineering
·
2024
·
IF 4.9
Fu Huide,Wang Ben,He Rui,Yang Yongpu,Li Hongyuan,Guo Zhiguang
Photovoltaic (PV) power generation is highly regarded for its capability to transform solar energy into electrical power. However, in real-world applications, PV modules are prone to issues such as increased self-heating and surface dust accumulation, which contribute to a reduction in photoelectric conversion efficiency. Furthermore, elevated temperatures can adversely affect the components’ operational longevity. To augment the efficiency and extend the lifespan of PV modules, it is crucial to implement cooling strategies and periodic surface dust removal. In this research, we introduce a composite PV module design that amalgamates a hygroscopic hydrogel with self-cleaning attributes. The design incorporates a superhydrophobic polydimethylsiloxane (PDMS) film as its exposed surface layer and employs a PAM-CaCl 2 -SiC hygroscopic hydrogel for rear cooling. This arrangement is intended to facilitate efficient surface self-cleaning and passive cooling of the composite PV module. Experimental studies were conducted to evaluate the performance of this innovative composite PV module design, and the results showed that the composite PV panel had an increase of about 1.39% in power generation compared to an ordinary PV panel in the spring of Shenzhen, China.
研究领域:
可再生能源
·
材料科学
·
环境工程
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）