JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 6
·45810
·
IF 1.86
Xianglong Li,Teng Hou,Yishen Lu,Bin Yang
In the present study, we provide a method for controlling the surface morphology of centrifugally spun starch-based fibers by adjusting the ratio of amylopectin/amylose in starches and combining with a hot blast temperature. The effects of hot blast temperature, amylopectin, and amylose on fiber surface morphologies are investigated. Scanning electron microscopy is used to characterize the morphology of the prepared fibers. The results show that fibers with burr-shaped nanostructures on the surface can be fabricated by adding amylopectin to starches and are promoted by increasing the hot blast temperature. However, amylose in starches plays the role of smoothing the fiber surfaces. X-ray diffraction reveals that the fibers are amorphous. Through Fourier transform infrared spectroscopy analysis, it was found that some physicochemical changes occur during centrifugal spinning. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45810.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Xue Yang,Mengyu Lin,Jiumei Chu,Dianquan Dong
The unique properties of cesium compounds have garnered increasing attention, among which Cs 2 Ti 6 O 13 shows great potential for applications. This paper synthesized Cs 2 Ti 6 O 13 (CTO-3) using a template-assisted solvothermal method with cesium carbonate as the cesium source and tetrabutyl titanate as the titanium source. Among them, F127 and hexadecylamine are used as template agents to modulate the surface morphology and hydrophilicity of the precursor. The cesium ion sieve H 2 Ti 6 O 13 (HTO-3) synthesized after hydrochloric acid pickling has a large specific surface area and good hydrophilicity. This structure is conducive to the ion exchange between Cs + and H + , resulting in a fast adsorption rate. It is completed within 2 h, and the adsorption capacity reaches 360 mg/g, which is significantly greater than that of the traditional high-temperature solid-phase method. The adsorption process of Cs + on HTO-3 is more consistent with the pseudo-second-order kinetic equation model, and the adsorption process is chemical adsorption. HTO-3 exhibited good selectivity and cycle stability. At the fifth time of the adsorption-resolution cycle, the adsorption capacity was 87.1 % of the first time.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 1
·147
·
IF 3.164
Mao Jiang,Qiaoli Niu,Xiao Tang,Heyi Zhang,Haowen Xu,Wentao Huang,Jizhong Yao,Buyi Yan,Ruidong Xia
The commonly used electron transport material (6,6)-phenyl-C61 butyric acid methyl ester (PCBM) for perovskite solar cells (PSC) with inverted planar structures suffers from properties such as poor film-forming. In this manuscript, we demonstrate a simple method to improve the film-forming properties of PCBM by doping PCBM with poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) as the electron transport layer (ETL), which effectively enhances the performance of CH3NH3PbI3based solar cells. With 5 wt % F8BT in PCBM, the short circuit current (JSC) and fill factor (FF) of PSC both significantly increased from 17.21 ± 0.15 mA·cm−2and 71.1 ± 0.07% to 19.28 ± 0.22 mA·cm−2and 74.7 ± 0.21%, respectively, which led to a power conversion efficiency (PCE) improvement from 12.6 ± 0.24% to 15 ± 0.26%. The morphology investigation suggested that doping with F8BT facilitated the formation of a smooth and uniform ETL, which was favorable for the separation of electron-hole pairs, and therefore, an improved performance of PSC.Keywords:perovskite solar cells;surface morphology;PCBM;doping
研究领域:
材料科学
·
能源研究
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Laishun Wu,Shuhang Deng,Jingjuan Lai,Li Wang,Guilong Yan,Chunxia Zhao,Dong Xiang,Hui Li,Bin Wang,Zhenyu Li,Hongwei Zhou,Yuanpeng Wu
Materials With the ability to swiftly transition into a lubricated state hold significant importance across various applications, including human-machine interfaces, crawling robots, and medical dressings. Achieving a rapid and reversible shift from high adhesion to low friction over a broad range has posed a considerable challenge, as most reversible transitions in adhesive hydrogels typically occur only at the microscopic level. In this study, this challenge has been addressed by leveraging the synergistic interplay between dynamic macroscopic contact and microscopic group changes to engineer a switchable adhesion-to-lubrication hydrogel (denoted as the PVA/PAA hydrogel). Upon the application of borax to the PVA/PAA hydrogels (denoted as the B-PVA/PAA hydrogel), alterations in surface morphology and hydrophilicity ensue due to the cross-linking of hydroxyl and boron atoms and the subsequent dissociation of carboxyl groups induced by borax. These transformations caused by synergistic effects give rise to changes in the adhesive and lubrication characteristics of the hydrogels. Consequently, the hydrogel can readily transition between an adhesive state (adhesion strength ∼ 26 kPa) and a lubrication state ( μ ∼ 0.028), driven by shifts in surface topography and hydrophilicity. This mechanism provides a versatile and efficient approach for the creation of a fast-switchable adhesive gel with stick-slip properties, offering promising prospects for a wide array of practical applications.
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
高影响因子
ENERGY & FUELS
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2024
·
IF 5.2
Shi-dong Zhou,Zhen-hao Ren,Yi-song Yu,Yang Liu,Xiao-fang Lv,Hui Du
During the operation of deep-sea pipelines, the accumulation and deposition of hydrates are important reasons for pipeline blockage. The current main measure to solve the hydrate plugging problem is the addition of low-dose inhibitors (LDHIs), but it is not yet known whether the precipitation of wax crystals will affect their effectiveness. Therefore, in this study, the hydrate cohesive force within the wax-free/wax-containing system was directly measured by using a micromechanical force device (MMF) and the reasons for the change in cohesive force were analyzed from a morphological point of view. The results showed that glycine was effective in reducing the cohesion between hydrate particles in both wax-free/wax-containing systems and still exerted the effect of antiagglomeration agent (AA) at very low concentrations (as low as 0.10 wt %). Moreover, the optimum concentration of glycine was 0.50 wt %. At this concentration, the cohesive force decreased from 8.54 to 7.07 mN/m in the wax-free system, a decrease of about 17.2%, while the cohesive force decreased from 5.94 to 2.15 mN/m in the wax-containing system, a decrease of about 63.8%. By observation of the morphology of the hydrate particles, the presence of glycine was found to reduce the volume of the liquid bridge by changing the surface roughness and wettability of the particles, thereby reducing the cohesive force. And when wax was contained in the system, the wax further reduced the wettability by adsorbing on the surface of the hydrate particles. However, under certain AA conditions, the increase in wax concentration (from 0.1 to 0.3 wt %) resulted in the free water inside the hydrate being more likely to form liquid bridges with the surrounding particles, thus weakening the effect of AA. This work analyzes the effect on cohesive force in the simultaneous presence of LDHIs and wax from a morphological point of view, which is beneficial in providing more insights into securing safe hydrate flow management.
研究领域:
石油工程
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化学工程
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产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3525-3536
·
IF 2.961
Lu Jingling,Xu Cunying,Li Jianru,Wang Shuxian,Xiang Qinqin,Chen Xiao,Hua Yixin,Li Yan
The effects of nicotinic acid (NA) on the electrodeposition of Al-Mn alloy have been investigated in aluminum chloride-1-butyl-3-methylimidazolium ionic liquids (AlCl 3 -BMIC) containing 0.15 mol·L −1 MnCl 2 (AlCl 3 -BMIC-MnCl 2 ). The electrochemical behaviors of the AlCl 3 -BMIC-MnCl 2 electrolyte have been studied here using cyclic voltammetry and potentiodynamic polarization. The addition of NA obviously increased the nucleation overpotential of Al-Mn alloy and inhibited the reduction reaction of Al(III) and Mn(II). The resultant surface morphologies, composition, and roughness of the Al-Mn alloy coating were revealed by scanning electron microscopy (SEM), transmission electron microscope (TEM), and atomic force microscopy (AFM). It was found that these additives strongly affect the morphology, composition, roughness, and crystal structure of the Al-Mn alloy coating. With the addition of NA, the content of Mn decreased, and Al-Mn alloy coatings became more uniform and smoother. The crystal structure of Al-Mn coatings was also examined by X-ray diffraction (XRD), where it was found that the phase composition of the deposits depends on the quantities of additives. For electrolyte containing little or no NA additives, the resulting alloy is amorphous structure. With NA additives up to 6·mmol L −1 , the Al-Mn coating changed into a mixture phase of amorphous and crystalline structure.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Binbin Zhang,Jia Wang,Jie Zhang
Despite the considerable demand for unique non-wetting superhydrophobic surfaces, simple and scalable one step fabrication approach has rarely been established. Herein, we report a convenient one step hydrothermal strategy for fabrication of superhydrophobic 5083 aluminum alloy (AA5083) surface. The spontaneously formed rough micro-structures and water repellent property can be achieved after pentadecafluorooctanoic acid (PFOA) aqueous solution treatment. The surface topography and chemical compositions were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The co-existence of flower-like micro-structures and abundant -CF 3 and -CF 2 groups after one step PFOA hydrothermal treatment contributes to the improved air-liquid interfacial contact area and the eventual anti-wetting behaviors. The as-prepared superhydrophobic AA5083 surface exhibits excellent water flow repellency, stable self-cleaning ability and favorable corrosion resistance . We believe the convenient and effective one step strategy will inspire the large-scale preparation of multifunctional surfaces for widely application scope.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2016
·Vol. 48
·期 3
·173-178
·
IF 1.018
Beibei Wan,Junfei Ou,Damei Lv,Mingshan Xue,Fajun Wang,Huiming Wu
Superhydrophobic ceria on the aluminum substrate was fabricated, and its corrosion resistance was investigated by different techniques. For example, the so-obtained superhydrophobic sample was immersed into the NaCl aqueous solution, and the variations in the surface wettability as well as the surface morphology were monitored; potentiodynamic polarization in the NaCl aqueous solution was adopted to evaluate its electrochemical corrosion resistance; a droplet of the aqueous solution HCl was dripped onto the superhydrophobic surface, and the corrosion process as well as the surface morphology after corrosion was monitored. The experimental results showed that the superhydrophobic ceria possessed a good corrosion resistance because of the entrapped air in the solid/liquid interface. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Zheng Li,Zi Jian He,Ying Cheng Zhou,Yi Tang,Yu Fang Chen,Tao Jin
In this paper, Dimethyl sulfoxide (DMSO) was used in the activating process of cotton filter cloth to improve its further hydrophobic modification reaction between cotton fabric and 1-octadecene via an electron transfer (ARGET) atom transfer radical polymerization (ATRP) mechanism. The major influences of DMSO on ARGET-ATRP process was discussed, and meanwhile, the microstructure changes, morphology feature and performance characteristics of cotton filter cloth during the reaction was explored by the SEM, AFM, EDS, XRD and TGA techniques.The result shows that DMSO can leads to cotton fibers adhesion and surface roughening under the ARGET-ATRP grafting reaction conditions, but has little changes on the crystal form, crystallinity and thermal properties of cellulose. At a DMSO dosage of 10%, the hydrophobically modified cotton filter cloth has a water contact angle (CA) of up to 141°. While naturally placed for 1 hour, the CA of hydrophobically modified cotton filter cloth can be stable at 116° with a decay rate of 17.5%, which proves that the hydrophobic stability of cotton filter cloth has been improved markedly. Furthermore, a better improvement for the hydrophobic stability of cotton filter cloth will significantly enhance the application of hydrophobic functional modified cellulosic materials.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
Materials
·
2019
·Vol. 12
·期 3
·390
·
IF 2.972
Zhiying Hu,Dingheng Zheng,Rong Tu,Meijun Yang,Qizhong Li,Mingxu Han,Song Zhang,Lianmeng Zhang,Takashi Goto
Highly-oriented polycrystal 3C-SiC bulks were ultra-fast fabricated via halide chemical vapor deposition (CVD) using tetrachlorosilane (SiCl4) and methane (CH4) as precursors. The effects of deposition temperature (Tdep) and total pressure (Ptot) on the orientation and surficial morphology were investigated. The results showed that the growth orientation of 3C-SiC columnar grains was strongly influenced byTdep. With increasingTdep, the columnar grains transformed from <111>- to <110>-oriented. The arrangement of <111>-oriented columnar grains was controlled byPtot. Lotus-, turtle-, thorn-, and strawberry-like surface morphologies were naturally contributed by different arrangements of <111>-oriented grains, and the deposition mechanism was discussed. The wetting behaviors of CVD-SiC samples by molten aluminum were also examined at 1173 K in a high vacuum atmosphere.Keywords:3C-SiC;chemical vapor deposition (CVD);orientation;surficial morphology;wettability
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Xujuan Huang,Aiting Wang,Xu Xu,He Liu,Shibin Shang
We report on an efficient method for the formation of modified cellulose-based materials with enhanced hydrophobic properties, formed by grafting with polymeric epoxidized soybean oil (ESO) as a renewable, environmentally friendly, and low cost raw material. The grafting process occurred via ring-opening polymerization, wherein the cellulose hydroxyl groups acted as initiators in the presence of a SnCl4 catalyst, linking the cellulose fibers and ESO via ether linkages, thereby forming a polymeric matrix. The surface polarity was therefore decreased by the substitution of cellulose hydroxyl groups for long-chain hydrophobic alkane moieties from ESO. The water contact angle of modified filter paper reached 145.1° with the surface free energy decreasing to 22.07 mJ m–2 and a hydration free energy of −13.09 mJ m–2. The presence of polymeric ESO nanoparticles on the modified cellulose fibers suggested that the hydrophobicity was not only dependent on the surface composition but was also closely related to the surface morphology. To reveal the effects of surface morphology on hydrophobicity, smooth cellulose films anchored to mica plates via PVAm with a surface roughness of 1.698 nm were prepared by spin coating and modified with ESO. The thus-formed modified cellulose films also contained polymeric ESO nanoparticles which increased their roughness and enhanced their hydrophobic properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 35
·10777-10782
·
IF 6.641
Fuqiang Fan,Cheng Liu,Sha Wang,Jinqiu Lv,Wenze Li,Yu Fu,Huaping Xu
An ordered pattern or a distinct texture on surfaces endows materials with specific applications, such as oil–water separation, advanced anticounterfeiting and optical devices. Conventional photolithography and surface patterning methods can form only 2D patterns, and they are also limited by the shape of a material and the required equipment. In this study, a swelling-induced 3D photopatterning (SPP) method is demonstrated to manipulate both the shape and surface pattern of a material. Under the irradiation of visible light, metathesis of diselenide bonds induces different swelling behaviors between irradiated and nonirradiated regions. Based on the differences, various programmable 3D patterns are obtained. Notably, the SPP method is not limited by the size and shape of the material; therefore, this method can be applied to thin film materials, bulk materials and cylindrical materials. In addition, this strategy has potential applications in advanced anticounterfeiting.
研究领域:
材料科学
·
光学工程
✓ 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）