SOLAR ENERGY
·
2024
·
IF 6
Wuzhi Yuan,Huaming Li,Kui He,Ya Ge,Si-Min Huang
Dust on the PV surface is well known to cause significant losses in energy yield. Complex physical and chemical interactions occur between dust and condensate on the surface of PV module under condensation, which determine the mode and severity of surface contamination. In this work, dynamic behavior of dust particle on surface is investigated from a microscopic perspective. Dust mainly experiences particle aggregation, dusty droplet coalescence, growth, movement and drying. After condensation & drying, surface transmittance is quantitatively measured to provide an assessment of surface contamination. The results show that for SiO 2 and Al 2 O 3 particles, that do not react with condensate, surface transmittance increases after drying, especially for superhydrophobic surface (SHS). However, CaO particle easily react with condensate and atmospheric carbon dioxide to form insoluble substances. After drying, a dense layer of dust is formed on the hydrophilic surface with transmittance of 49.2 %. SHS has excellent ability of self-cleaning and it increases with extension of condensation time. As condensation time is 120 min, transmittance of SiO 2 -contaminated SHS can recover to 99.1 % of clean surface. This finding may guide for development of suitable strategies to prevent or mitigate surface-soiling under condensation.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zhanglei Zhu,Wanzhong Yin,Bin Yang,Yafeng Fu,Jiwei Xue
Slime contamination is an urgent problem that should be solved in coal flotation. The adverse effects of slime contamination, by which low-ash clean coal is covered by high-ash fine slime and hence cannot be separated through the direct flotation process, have been recognized for the past decades. In this investigation, to reduce slime contamination, the reverse-and-direct flotation process was proposed. Flotation results indicated that, based on the similar ash content, the concentrate yield increased by 7.36% using the reserve-and-direct flotation process compared with the two-steps direct flotation process. XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) results verified that the reduction of fine clay minerals coating on the surface of clean coal was achieved and hence the flotation performance was improved with the reverse-and direct flotation process. Therefore, it can be arrived that the reverse-and-direct flotation process is a potential and effective separation method to upgrade the flotation performance of fine coking coal.
研究领域:
矿物加工工程
·
煤炭浮选技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 318
·期 3
·2307-2311
·
IF 1.181
Chen Yanliang,Zhao Chao,He Linfeng,Tang Fangdong
A method was set up to prepare reference sources for calibration of surface contamination monitors using Nafion HP membrane to fix the radioactive nuclides on aluminium backing material. By investigating the adsorption mechanism including kinetics and pH, it has been proved the 241 Am could be fixed on the membrane effectively. The surface emission rate and the activity was measured to characterize the sources. In addition, the uniformity of the sources was evaluated according to ISO 8769 and the standard deviation of the surface emission rates from each individual portion of the whole source was no greater than 5%.
研究领域:
核技术
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Jianwen Peng,Peng Ye,Fei Xu,Xinyu Bu,Ruitao Wang,Dan Lin,Sicheng Yuan,Yanji Zhu,Huaiyuan Wang
Solar energy is an inexhaustible carbon-free source, and solar cells are invaluable enablers for achieving carbon neutrality ; however, the surface contamination on the glass of solar cells poses a formidable obstacle to maintaining a high power conversion efficiency . Existing self-cleaning coatings for combating surface contamination generally lack the highly comprehensive properties required for applications in real-world conditions. Herein, eco-friendly, highly transparent, waterborne omniphobic Si 2.5 WPA/AmZnO@SiO 2 coatings were developed by the ingenious design of polydimethylsiloxane-grafted waterborne polyacrylate (Si x WPA) and (3-aminopropyl)triethoxysilane-modified-SiO 2 encapsulated ZnO quantum dots (AmZnO@SiO 2 ). The enriched PDMS flexible chains on the coating surface overcame the energy barriers for moving liquids, and the AmZnO@SiO 2 inside absorbed and scattered UV rays, which synergistically endowed the coating with self-cleaning and UV-shielding properties. Importantly, after the self-cleaning procedure, the light transmission of dust-contaminated glass and short-circuit current density of corresponding solar cells could be restored to 99.78 % and 97.77 % of initial metrics, respectively. Furthermore, the commonly ignored self-cleaning mechanism was investigated and proposed: the coating weakened the adhesion of dust particles and utilized the drag force generated during liquid slip to achieve self-cleaning. The coating also showed good UV/humidity/thermal stability and mechanical strength , providing a design blueprint for outdoor optical device protection.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·822
·
IF 3.267
Xinwei Wang,Shan Lu,Tianzheng Wang,Xinran Qin,Xilin Wang,Zhidong Jia
Surface pollution deposition in a high voltage surface can reduce the surface flashover voltage, which is considered to be a serious accident in the transmission of electric power for the high conductivity of pollution in wet weather, such as rain or fog. Accordingly, a rapid and accurate online pollution detection method is of great importance for monitoring the safe status of transmission lines. Usually, to detect the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD), the pollution should be collected when power cut off and bring back to lab, time-consuming, low accuracy and unable to meet the online detection. Laser-induced breakdown spectroscopy (LIBS) shows the highest potential for achieving online pollution detection, but its application in high voltage electrical engineering has only just begun to be examined. In this study, a LIBS method for quantitatively detecting the compositions of pollutions on the insulators was investigated, and the spectral characteristics of a natural pollution sample were examined. The energy spectra and LIBS analysis results were compared. LIBS was shown to detect pollution elements that were not detected by conventional energy spectroscopy and had an improved capacity to determine pollution composition. Furthermore, the effects of parameters, such as laser energy intensity and delay time, were investigated for artificial pollutions. Increasing the laser energy intensity and selecting a suitable delay time could enhance the precision and relative spectral intensities of the elements. Additionally, reducing the particle size and increasing the density achieved the same results.Keywords:laser-induced breakdown spectroscopy;surface pollution;high voltage insulators;quantitatively analysis
研究领域:
电气工程
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 6
·065101
·
IF 1.62
Yueju Zhao,Xiwei Xie,Jinbiao Shi,Huaping Shan,Min Liu,Jie Liu,Jianhui Wang,Boyan Jia,Yongli Zheng,Qiang Chen,Chunfeng Zhao,Jilin Teng,Wenhua Miao
Due to the long-term operation of power grid and the interference of external uneven electric field environment, silicone rubber insulators are prone to aging and scaling, and their hydrophobicity and external insulation performance are easily affected. In order to solve this problem, a kind of silicone rubber insulator outer surface cleaning and repairing agent was prepared with self-made composite solvent and silicone as the main raw materials, supplemented by catalyst, surfactant and other additives. So as to achieve the dual effect of efficient cleaning and aging repair, improve its hydrophobicity and prolong its service life. Through hardness test, hydrophobicity test, SEM test, FT-IR test, EDS test, mechanical property test and aging test characterization, and comparing the cleaning effect of different cleaning methods, it is found that the cleaning effect of cleaning repair agent is the best. In addition, it is found that the hydrophobicity of insulator has been greatly improved, from HC4 to HC1, and the mechanical properties have also been improved. This is because after using the cleaning and repairing agent, the powdered layer on the insulator surface is removed, and more hydrophobic methylene (Si–(CH3)2) and methylene (Si–(CH3)3) are attached to the insulator surface, which reduces the -OH binding force between the insulator surface and water molecules. In addition, through the observation of the surface and cross-section micro morphology, it is found that the surface roughness of the insulator is greatly reduced and the micro cracks disappear after using the cleaning and repairing agent, which highlights a certain repairing effect. Finally, the aging test also shows that the cleaning repair layer has a certain durability.The results show that the cleaning and repairing agent can effectively clean and repair the aged insulator, improve its anti- pollution flashover ability and prolong the service life of silicone rubber insulator.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
International Journal of Pavement Engineering
·
2025
·
IF 3.3
Bonan Ma,Yancai Liu,Zhuowen Yang,Fei Wang,Kaisheng Luo,Enhui Yang,Yanjun Qiu
As a key interface in concrete bridge deck systems, the waterproof adhesive layer (WAL) must ensure both water resistance and reliable bonding. In this study, a polymer composite WAL (PCWAL) was developed via hydrophobic modification and fiber reinforcement, guided by central composite design (CCD). FTIR analysis confirmed no chemical reactions among components, while TGA-DSC revealed strong thermal stability with <2% mass loss at 200 °C. SiO₂ and PF modification significantly improved hydrophobicity (contact angle θ = 125.3°), enhancing anti-seepage properties. PCWAL maintained bonding strength at −25 °C without cracking, demonstrating excellent frost resistance. Under 10-day water immersion, bond strength declined by less than 5%, indicating strong water resistance. Surface contamination negatively affected adhesion: at 40 g/m², shear and pull-out strengths declined by 12.6% and 13.9%, respectively. Surface treatments—particularly milling—effectively restored bonding strength, increasing it by up to 16.0% (shear) and 11.5% (pull-out). These findings demonstrate that PCWAL possesses outstanding durability and bonding performance under complex environmental conditions, supporting its application in long-span concrete bridge decks.
研究领域:
土木工程
·
材料科学
·
结构工程
·
高分子科学
·
交通基础设施
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Gengxin Zhang,Jiewen Zhou,Quanjie Lv,Ruihao Yang,Yuhan Zhang,Jing Chu,Haoran Zhang,Yijun Han,Kang Sun,Congli Yuan,Ke Tao
The persistent threat of viral epidemics poses significant risks to human health, highlighting the urgent need for antiviral surfaces to mitigate viral transmission through bioaerosols and surface contamination. However, there is still a scarcity of readily accessible antiviral coatings to address this critical concern. In this study, we demonstrate that photodynamic nanoparticle-embedded surfaces can swiftly inactivate both enveloped and non-enveloped viruses. We prepared core–shell structured methylene blue (MB)-loaded SiO 2 nanoparticles with a high reactive oxygen species (ROS) yield (0.47 ± 0.02). The superior ROS production was maintained after modifying these nanoparticles onto air filter fibers, likely due to the prevention of aggregation-caused quenching effects. Three viruses, including both enveloped and non-enveloped types, were rapidly inactivated within just 12 min (>6 log units) under medium light intensity (660 nm, 30 mW/cm 2 ). Mechanistic studies revealed that envelope glycoproteins are the primary targets for this rapid inactivation. Thus, photodynamic nanoparticle-embedded surfaces offer a straightforward and adaptable strategy in the fight against viral epidemics.
研究领域:
纳米技术
·
病毒学
·
材料科学
·
光动力疗法
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Keyi Xu,Lihui Gao,Shulei Li,Hongzhao Liu,Yanhong Liu,Wenfeng Pan
The extraction of gallium using amidoxime chelating resin has demonstrated extensive industrial applications. However, repeated desorption cycles lead to resin deactivation, and untreated waste resins may pose environmental risks. This study conducted deactivation diagnosis on waste resin, characterizing its surface morphology and functional group distribution through FSEM, XPS, and FTIR analyses. The deactivated resin exhibited three key characteristics: Surface contamination by impurities, oxidation of amidoxime groups into carboxylic acids and hydroxamic acids, and occupation of Ga(III) adsorption sites by competing ions. To address these issues, a regeneration strategy combining ultrasonic cavitation for impurity removal with amidoximation of residual nitrile groups was proposed. Under the conditions of Ga(III) concentration 200 mg/L, pH 12, and liquid-solid ratio 100 mL/g, the regenerated resin demonstrated an adsorption capacity of 12.21 mg/g, which was 2.71 times that of new resin. The adsorption process of the regenerated resin conforms to the Langmuir isotherm. The theoretical maximum adsorption capacity of Ga(III) was calculated to be 34.78 mg/g under alkaline conditions. XPS analysis confirmed the critical role of oxygen-containing functional groups in Ga(III) adsorption. This research provides novel insights into resource utilization of the waste resin and demonstrates significant potential for Ga(III) extraction applications.
研究领域:
环境科学
·
化学工程
·
材料科学
·
冶金学
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhenxin Yang,Fushun Li,Yuanju Zhao,Delong Yang,Juntao Hu,Tao Zhang,Deng-Ke Wang,Qiang Zhu,Zheng-Hong Lu
Organic field-effect transistors (OFETs) fabricated on SiO2/Si wafers represent a crucial avenue for the development of organic-on-silicon technology and serve as a platform for materials science to characterize carrier mobility. The surface cleaning treatment of wafers is critical because OFETs are highly sensitive to surface states. In this study, the effects of intrinsic organic contaminants on wafers, as well as the functions of commonly used cleaning solvents and treatments on the surface states, electronic structure of SiO2, and the performance of OFETs were systematically investigated. The intrinsic organic contaminants on the wafer surface were identified as being in positively charged states, which led to high operational voltages of OFETs and degraded bias-stress stability. However, their impact on field-effect mobility was found to be minimal following any surface cleaning process. The conventional ultrasonic cleaning using acetone and isopropanol only partially removed contaminants, which provides limited improvement in reducing operational voltages and enhancing bias-stress stability. The subsequent ultrasonic cleaning with deionized water and UV-ozone treatment further removed contaminants. More importantly, these processes anchor hydroxyl species on the SiO2 surface, which impart negative charges for the neutralization of surface charge states, thereby comprehensively enhancing operational performance of devices. By leveraging the distinct properties of various solvents and treatments, an optimized surface cleaning protocol was proposed, in which the threshold voltage of OFETs was reduced to nearly 0 V, and the bias-stress stability was enhanced by approximately 300%.
研究领域:
材料科学
·
电气工程
·
表面化学
·
半导体器件
·
有机电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）