CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yu Bai,Yun Zhao,Yang Li,Jiachao Xu,Xiaoting Fu,Xin Gao,Xiangzhao Mao,Zhaoyong Li
In this study, we fabricated a soft, transparent UV-shielding film (Alg-Fe 3+ -EDTA) by crosslinking sodium alginate with a ferric ion solution containing EDTA. The obtained films were characterized via SEM, ATR-FTIR, XRD, TG and DTG; the results indicated that the synergistic gelation of ferric alginate and alginic acid existed in Alg-Fe 3+ -EDTA film. The Alg-Fe 3+ -EDTA film performance to be optimized under the following conditions: 1.6% Fe 3+ , 0.8% EDTA, and crosslinking duration of 12 min. The Alg-Fe 3+ -EDTA film had high visible light transmittance, the UV-C (200–280 nm) and UV-B (280–315 nm) shielding rates were 100%, and the UV-A (315–400 nm) shielding rate was 98.37%; the UPF reached 50+; additionally, the tensile strength and elongation-at-break were 56.85 MPa and 10.45%, respectively, and still have ultraviolet shielding effect under water environments or after strong light irradiation. This work provides an efficient method to improve the optical and mechanical ability of ferric alginate films.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Liu Xianhu,Zhang Wenrui,Zhang Xin,Zhou Zhengui,Wang Chunfeng,Pan Yamin,Hu Bin,Liu Chuntai,Pan Caofeng,Shen Changyu
The rational use and conversion of energy are the primary means for achieving the goal of carbon neutrality. MXenes can be used for photothermal conversion, but their opaque appearance limits wider applications. Herein, we successfully develop visible-light transparent and UV-absorbing polymer composite film by solution blending the MXene with polyethylene and then vacuum pressing. The resulting film could be quickly heated to 65 °C under 400 mW cm −2 light irradiation and maintained over 85% visible-light transmittance as well as low haze (<12%). The findings of the indoor heat insulation test demonstrate that the temperature of the glass house model covered by this film was 6-7 °C lower than that of the uncovered model, revealing the potential of transparent film in energy-saving applications. In order to mimic the energy-saving condition of the building in various climates, a typical building model with this film as the outer layer of the window was created using the EnergyPlus building energy consumption software. According to predictions, they could reduce yearly refrigeration energy used by 31-61 MJ m −2 , and 3%-12% of the total energy used for refrigeration in such structures. This work imply that the film has wide potential for use as transparent devices in energy-related applications.
研究领域:
材料科学
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能源工程
·
光热转换
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuanhao Ma,Haoxiang Rong,Yanan Zhang,Xun Lu
Achieving robust, high elasticity, transparency, self-repairing, reprocessability and durability simultaneously remains a huge challenge. In this work, we propose a simple strategy to prepare an ultra-high strength, outstanding elasticity, self-repairing and reprocessable poly (thiourethane-urea) (PTUU) film based on interlocking hydrogen bonds (IHBs) and reversible topological networks. The IHBs between its main chains make it have ultra-high tensile strength (61.6 MPa) and good scratch resistance. It is the highest tensile strength ever recorded for crosslinked self-repairing materials at medium temperature thus far. The synergistic effect of IHBs and topological networks makes it high elasticity and can repair more than 90 % of the mechanical strength. Rearrangement of reversible topology network at high temperature endows PTUU with reprocessability, and the mechanical strength remains more than 85 % after reprocessing for three times. In addition, PTUU films have high transmittance (96.6 %, 0.5 mm), low haze, high refractive index and excellent durability, which have broad application prospects in transparent protective materials, optical lenses, stretchable fibers, wearable electronic devices and other fields.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 8
·6504-6510
·
IF 3.84
Yaoquan Jiang,Yafei Zhao,Xin Feng,Jianhui Fang,Liyi Shi
The first use of nanocellulose extracted from bamboo fibers as a fibrous network skeleton and carbon dots derived from nanocellulose as guest fluorescent nanomaterials to construct a transparent, photoluminescent hybrid film is reported. The primary hydroxyls of nanocellulose are firstly converted to the carboxyl form by using tetramethyl-1-piperidinyloxy (TEMPO)-mediated oxidation to enhance the interfacial interaction with carbon dots and then to assemble heterogeneous network architectures through covalent bonding. The carbon dots derived from TEMPO-mediated oxidized nanocellulose display highly uniform spherical morphology with a narrow size distribution ranging from 6 nm to 11 nm. The resultant nanocellulose-based hybrid film has high transparency in bright field imaging and a strong blue luminescence under ultraviolet excitation. Furthermore, the biocompatible hybrid film extracted from the biomass exhibits excellent thermal stability and outstanding mechanical durability, which could be utilized as a substitute for petroleum-based film for diverse applications.
研究领域:
材料科学
·
生物化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Ying Qi,Shaojian Lin,Jianwu Lan,Yifei Zhan,Junling Guo,Jiaojiao Shang
A transparent versatile cellulose platform film was prepared from Eucalyptus pulp in this work. Based on such cellulose platform, multifunctional cellulose films with ultraviolet-shielding, photochromism, and strong mechanical strength were fabricated via nucleophilic postmodification strategy by introducing a versatile spiropyran moiety into cellulose molecules. The fabricated cellulose films exhibited super-high transmittance up to 96% and performed notable ultraviolet-shielding capacity at 200–400 nm. Moreover, the photochromic performance of cellulose films with color changes could be clearly observed by the naked eyes, and the fluorescent blue could be excited. Besides, the tensile stress of multi-functional cellulose film was about 80 MPa, which was almost 8 times stronger than that of the commercial polyethylene film at the same thickness. It is noteworthy that these superior performances promote such a cellulose platform to be a versatile precursor for fabricating various multi-functional cellulose used in the fields of out-door coating, transparent packaging, optical screen, etc .
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jizhe Zhang,Juan Xu,Yuan Gao,Feng Qin,Xingzhong Zhu,Caixia Kan
In various fields, the innovation of optoelectronic devices crucially depends on flexible, transparent materials that shield against electromagnetic interference. Herein, the fabrication of flexible transparent electromagnetic interference shielding effectiveness (EMI SE) composite films on PET substrates is achieved using silver nanowires (Ag NWs) and two-dimensional nanosheets (Ti3C2Tx). The uniform Ag NWs with high aspect ratio as a basic conductive network are synthesized using a modified polyol method, which is further optimized through combining with two-dimensional multilayer MXene nanosheets. The Ag NW/MXene composite films acquire a sandwich structure after sequential layering of Ag NW/MXene, finalized by spin-coated PMMA layer. It is worth noting that the addition of MXene nanosheet can decrease surface roughness and increase conductivity via filling the gap of Ag NW network. The Ag NW4/MXene4 composite films with excellent photoelectric performance are suitable for the commercial applications considering the production costs. Furthermore, the fabricated Ag NW/MXene/PMMA composite films demonstrate exceptional flexibility, maintaining integrity after 10 000 continuous bending cycles, and exhibit remarkable stability under harsh conditions, specifically in environments of 80 °C and 80% relative humidity (RH) for duration of 30 days. By finely tuning the concentrations of Ag NW and MXene nanosheets, these composite films attain significant EMI SE level of 35 dB in the X-band. In the EMI shielding mechanism, the absorption component of the shielding effectiveness (SE) is shown to play an important role. The integration of MXene into the composite film markedly improves its EMI shielding effectiveness by boosting the conductivity of the Ag NW network. Furthermore, the multireflection originating from the inner MXene nanosheet is another pathway to promote the EMI shielding performance, which is always neglected for the thin films. Taken together, the introduction and understanding of MXene into Ag NW transparent films provide inspiration for the development of advanced EMI shielding materials for wide applications.
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
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Shaomin Dan,Huimin Gu,Jiaojun Tan,Baoliang Zhang,Qiuyu Zhang
A simple and efficient method without any coupling/chelating agents was developed to prepare the transparent epoxy/TiO 2 optical hybrid films with tunable refractive index. Instead of adding any coupling agents, the study found out that the lateral hydroxyl groups of epoxy resin E51 could serve as an intermediary to form organic–inorganic bonding between the organic matrix and the hydrolyzed titanium butoxide (TBOT). A series of homogeneous hybrid films were obtained without phase separation via adjusting the mole ratio of TBOT/hydroxyl groups, mass ratio of acid/water and the mixed solvent system. FTIR, XRD and TEM results proved the successful formation of nanoscale crystal-titania domains with the size of 3–5 nm and homogeneously dispersed in organic matrix. Furthermore, SEM and AFM results indicated the relatively good surface smoothness of the resultant optical hybrid films. More importantly, the refractive index of epoxy resin E51/TiO 2 optical hybrid films were tunable in the range of 1.512–1.731 at 633 nm, which linearly increased with the content of TiO 2 from 0 to 20 wt. %. These hybrid films with continuously tunable refractive index were expected to have great potential application in advanced optical devices.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xueqian Li,Junying Li,Xiaoying Shen,Mengyao Cao,Yu Wang,Wansong Zhang,Yanglei Xu,Zhe Ling,Sheng Chen,Feng Xu
Light-management films that can control solar transmission through themselves, especially those based on renewable and biodegradable materials, are significant for diverse photon-related applications such as energy-efficient buildings, photovoltaics, and optoelectronic devices. Herein, composite transparent films with adjustable haze and UV-blocking capabilities are developed based on the main components of lignocellulosic biomass (cellulose and lignin), and their promising applications in light management are also demonstrated. Carboxymethyl cellulose (CMC) with a good film-forming property is used as the substrate matrix, and cellulose nanocrystals (CNC) with a nanoscale rod-like shape are used as functional fillers. The obtained CMC–CNC composite films exhibit adjustable optical properties (high transparency of >90% and haze of 3.17–13%) and surprisingly enhanced mechanical strength and thermal stability when compared with pure CMC films. Furthermore, lignosulfonates (LS), as industrial lignin products, are combined to endow the CMC–CNC–LS composite films with excellent UV-shielding performance (98.17% UVB and 89.38% UVA), but they well maintain the high transparency and haze. We demonstrate that the composite films are able to avoid color changes of UV test cards by shielding UV light and that they achieve uniform illumination when light transmits through, indicating their promising potential for practical applications in light management. In addition, the effect of CNC and LS contents on the morphological, chemical, mechanical, and thermal properties of composite films is investigated. Our work provides novel insights into the fabrication of sustainable light-management films based on lignocellulose-derived materials by tuning their light-scattering and light-absorbing properties.
研究领域:
材料科学
·
可再生资源
·
光管理
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Minghui Cao,Minqiang Wang,Le Li,Hengwei Qiu,Zhi Yang
To optimize the performance of silver nanowire (Ag NW) film heaters and explore the effect of graphene on a film, we introduced poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) and graphene modified with ethyl cellulose (graphene-EC) into the film. The high-quality and well-dispersed graphene-EC was synthesized from graphene obtained by electrochemical exfoliation as a precursor. The transparent film heaters were fabricated via spin-coating. With the assistance of graphene-EC, the stability of film heaters was greatly improved, and the conductivity was optimized by adjusting the Ag NW concentration. The film heaters exhibited a fast and accurate response to voltage, accompanied by excellent environmental endurance, and there was no significant performance degradation after being operated for a long period of time. These results indicate that graphene-EC plays a crucial role in optimizing film stability and heat dispersion in the film. The Ag NW/PEDOT:PSS-doped graphene-EC film heaters show a great potential in low-cost indium-tin-oxide-free flexible transparent electrodes, heating systems, and transparent film heaters.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Wei Xu,Lu Zhong,Feng Xu,Wenfeng Shen,Weijie Song,Shulei Chou
A transparent, flexible, and conductive epoxy resin film embedded with silver nanowires is fabricated through a simple process. The effect of silver nanowire areal mass density on the electrical and optical properties of films is investigated. It is found that resistance of the transparent composite film will change regularly during the bending process. The influence mechanism of bending behavior on the electrical property is explored. On the basis of this mechanism, the curvature in the bending process can be acquired immediately by measuring the resistance of the composite film. The high elastic modulus (800 MPa) of the composite film is a benefit for distinguishing the factor of resistance change caused by bending or stretching with low force. Additionally, high stability of the bending detector is demonstrated with 500 repeated bending cycles and a 6-month durability test.
研究领域:
材料科学
·
纳米技术
·
传感器技术
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产品关联
DOI
Nanoscale
·
2017
·Vol. 9
·期 41
·15982-15989
·
IF 7.367
Weijing Yao,Qingyong Tian,Jun Liu,Qingwen Xue,Mengxiao Li,Li Liu,Qiang Lu,Wei Wu
Advanced anti-counterfeiting labels have aroused an intensive interest in packaging industry to avoid the serious issue of counterfeit. However, the preparation and cost of the existing labels associated with the drawbacks, including the complex and high-cost equipment, limit the protection of the authenticity of goods. Herein, we developed a series of anti-counterfeiting labels based on multicolor upconversion micro-particles (UCMPs) inks via straightforward and low-cost solutions, including spin-coating, stamping and screen printing. The UCMPs were synthesized through a facile hydrothermal process and displayed tunable red (R), green (G) and blue (B) color by doping different lanthanide ions, which are Er3+/Tm3+, Yb3+/Er3+ and Yb3+/Tm3+ in NaYF4 hosts, respectively. The optimal UCMPs inks were deposited on a flexible polyethylene terephthalate (PET) substrate to obtain transparent anti-counterfeiting labels possessing higher transmittance, stronger upconversion fluorescence intensity and good photostability. Under ambient conditions, the patterns and films were transparent, but could exhibit multicolor light under 980 nm laser excitation. They can be used as anti-counterfeiting labels for die-cutting packages to further elevate the security of goods. The tunable and designable transparent anti-counterfeiting labels based on RGB UCMPs inks exhibit the merits of low-cost, easy-manufacture and versatility, underlying the practical application in the field of anti-counterfeiting.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Shuang Sun,Yunming Wang,Longhui Li,Zhigao Huang,Huamin Zhou
Traditional fabrication methods for chitosan products limited in melt forming temperature higher than degradation temperature are hard to be directly applied to the manufacture of green transparent electronic substrates. Here, we proposed an innovative principle of all-green manufacture that surface molecular chains of chitosan nanospheres were melted at 120 °C and entangled under 8 MPa according to high molecules activity of Nano-effect on chitosan nanospheres surface, result in applicable mechanical performances (Hardness, 0.27 GPa; Modulus, 3.83 GPa). The optimum optical performance of chitosan substrate was 58% at visible light (400 nm ~ 800 nm). Additionally, chitosan nanospheres had been successfully fabricated as substrates of interdigital electrode sensors. Therefore, our innovative strategy provides a new processing concept of fundamental scientific principle, and directly promote the industrialization of chitosan in biosensors, thin film transistors , and all solid state supercapacitors , etc.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）