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Using nano technology for imparting PET/c blended fabric new functional performance properties

JOURNAL OF ENGINEERED FIBERS AND FABRIcS 2022年 17卷

作者： Al-Balakocy, N. G. Hassan, T. M. Aly, S. Y. Abd Elsalam, S. H. Elshakankery, Mahmoud Hamouda Natl Res Ctr Prot & Manmade Fibers Dept Cairo 12622 Egypt Helwan Univ Fac Educ Ind Educ Dept Cairo Egypt Helwan Univ Fac Appl Arts Text Dyeing Printing & Finishing Dept Cairo Egypt Natl Res Ctr Spinning & Weaving Dept Cairo Egypt

This article, discuss the effect of finishing polyester/cotton blended fabric (PET/c) with alkali and Titanium dioxide nanoparticles (TiO2 NPs) simultaneously. The treatment conditions such as NaOH and TiO2 NPs concentrations, reaction temperature and duration will be investigated. The effect of addition NPs on alkaline treatment conditions will prove through weight loss and carboxylic content. The ability of PET/c fabrics for loading with NPs during alkaline treatment was investigated by using SEM, EDX, and FTIR measurements. The effect of finishing of PET/c blended fabric with the suggested method on antimicrobial activity and ultraviolet protection was investigated. The simultaneous finishing of PET/c blended fabrics with alkali and TiO2 NPs showed excellent ultraviolet protection and high antimicrobial activity against Gram-positive (Bacillus mycoides), Gram-negative (Escherichia coli), and nonfilamentous fungus (candida albicans). The functional performance imparted to PET/c fabrics by the suggested approach are durable in repeated laundering processes, even after five Launder-Ometer washes.

关键词： PET c alkali treatment TiO2 NPs SEM EDX FT-IR antimicrobial UV protection

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Effective Anti-Oxidation Repair coating for c/c Brake Materials comprising Lead-Borosilicate and Bismuth-Borosilicate Glass

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MATERIALS 2022年第8期15卷 2827页

作者： Deng, Mengjia Xia, Xiaoyu Deng, Juanli Hu, Kaiyue Luan, chenghua Ma, Xu Fan, Shangwu Wang, Peng Changan Univ Sch Mat Sci & Engn Xian 710064 Peoples R China Politecnico Milano Dept Chem Mat & Chem Engn Pza Leonardo Da Vinci 32 I-20133 Milan Italy 52 Inst China North Ind Grp Yantai 264003 Peoples R China Northwestern Polytech Univ Sci & Technol Thermostructural Composite Mat Lab Xian 710072 Peoples R China Xian Xinyao Ceram Composite Mat Co Ltd Xian 710199 Peoples R China

To achieve effective antioxidation of on-site repair coating for c/c brake materials in the full temperature range (500-900 degrees c), lead glass and bismuth glass were introduced into the borosilicate glass to acquire the protective coatings. Before preparing coating samples, the thermal gravity characteristics of the lead/bismuth-borosilicate glass powders were analyzed by TG/DSc. The results revealed that the temperature at which weight gain begins was 495 degrees c and 545 degrees c, respectively. The oxidation behaviors of the lead- and bismuth-modified borosilicate glass coatings were compared at 500 degrees c, and the antioxidation properties of the former were further examined from 500 to 900 degrees c. The oxidation results indicated that mixing lead glass with borosilicate glass realized effective oxidation resistance in the full temperature range. With a lead content of 20%, the lead-borosilicate glass coating was able to protect c/c substrates from oxidation. The corresponding weight loss of the lead-glass-coated samples was -1.89% when oxidized at 500 degrees c for 10 h, while the weight loss was -2.55% when further oxidized at 900 degrees c for 10 h. However, mixing bismuth glass with borosilicate glass was difficult to achieve the oxidation resistance of the coating at 500 degrees c due to the significant phase separation.

关键词： borosilicate glass lead glass bismuth glass antioxidation coating c c composites

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Optimizing amplitude to improve machined surface quality in longitudinal ultrasonic vibration-assisted side milling 2.5D c/Sic composites

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cOMPOSITE STRUcTURES 2022年 297卷

作者： Xie, Zhenwei Liu, Zhanqiang Han, Linchi Wang, Bing Xin, Mingze cai, Yukui Song, Qinghua Shandong Univ Sch Mech Engn Jinan 250061 Peoples R China Key Natl Demonstrat Ctr Expt Mech Engn Educ Key Lab High Efficiency & Clean Mech Manufacture M Jinan 250061 Peoples R China Transmiss Factory Sinotruk Jinan Power Co Ltd Jinan 250220 Peoples R China

Fiber debonding pit badly affects the machined surface quality of carbon fiber reinforced silicon carbide matrix (c/Sic) composites. The longitudinal ultrasonic vibration-assisted side milling (UVAM) is applied to c/Sic machining in this paper. The fiber debonding pit damage is aimed to be suppressed by optimizing the UVAM amplitude. The fiber debonding depth prediction (FDDP) model is proposed based on the deformation and fracture behavior of carbon fiber during UVAM c/Sic composites, and the optimum UVAM amplitude in machining c/Sic composites can be obtained. The experimental results of UVAM c/Sic composites prove that the amplitude value obtained by the proposed FDDP model can significantly reduce the defects induced by fiber debonding pit.

关键词： c Sic composites Longitudinal ultrasonic vibration-assisted side milling Fiber debonding depth prediction Optimum UVAM amplitude

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Effect of Single Loading Time to the cyclic Ablation of c/c-Sic-Zrc composite

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MATERIALS 2022年第19期15卷 7027页

作者： Feng, Wei Wang, Xinyu Tian, Yunlong Liu, Lei Li, Boyan Xian Technol Univ Sch Mat & Chem Engn Xian 710021 Peoples R China

To understand the influence of single loading time on the cyclic ablation of carbide modified c/c composites, a c/c-Sic-Zrc composite was impacted by plasma at 2600 K for 50 s under reciprocating 0.5 (c-0.5) and 5 s (c-5), respectively. The composites displayed similar negative mass and rising positive linear ablation rates from c-0.5 to c-5. Phases, micro-morphologies, and surface temperature analysis suggested that the partially oxidized Sic-Zrc covering on the ablated sample cracked and was persistently peeled off. The mass gain resulted from the ceramic's protection of the nearby carbon from complete oxidation. The longer single loading of 5 s caused strengthened thermal chemical reaction and mechanical erosion, which resulted in the bigger linear loss.

关键词： cyclic ablation single loading time c c composite Sic-Zrc plasma

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Nutrient Resorption and c:N:P Stoichiometry Responses of a Pinus massoniana Plantation to Various Thinning Intensities in Southern china

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FORESTS 2022年第10期13卷

作者： Jiang, Jun Lu, Yuanchang chen, Beibei Ming, Angang Pang, Lifeng Beijing Forestry Univ Coll Forestry Beijing 100083 Peoples R China Res Ctr Forest Management Engn State Forestry & G Beijing 100083 Peoples R China Chinese Acad Forestry Expt Ctr Trop Forestry Pingxiang 532699 Peoples R China Chinese Acad Forestry Inst Forest Resource Informat Tech Beijing 100091 Peoples R China

Understanding the responses of c:N:P stoichiometry and nutrient resorption to thinning is essential to evaluate the effects of management practices on biogeochemical cycling in plantation forest ecosystems. However, nutrient resorption and c:N:P stoichiometry do not always respond in the same way to various thinning intensities, and the underlying mechanisms are not well understood. In this study, we aimed to examine the mechanisms underlying the impacts of thinning on c:N:P stoichiometry in a Pinus massoniana plantation, focusing on interactions among soils, plant tissues (leaves and litter), and soil properties. We conducted four different thinning treatments to determine the effects of thinning on the c:N:P stoichiometric ratios in leaves, litter, and soil in a Pinus massoniana plantation ecosystem. Thinning significantly increased the c, N, and P content of leaves, litter, and soil (p < 0.05). The effects of thinning on c:N:P stoichiometry varied strongly with thinning intensity. Specifically, thinning significantly decreased all c:N:P stoichiometry except leaf N:P and litter c:N (p < 0.05). The N resorption efficiency (NRE) showed no significant change, but thinning significantly decreased the P resorption efficiency (PRE, p < 0.05). This suggests that thinning has inconsistent impacts on N and P cycling in Pinus massoniana plantations. In addition, these different responses suggest that soil physicochemical processes play a crucial role in regulating the effects of thinning. Thinning intensity regulates the biogeochemical cycles of c, N, and P in Pinus massoniana plantation ecosystems by affecting nutrient resorption and soil physicochemical processes. The inconsistent results obtained can be attributed to the complexities of stand environments and the redistribution of site resources following thinning. Therefore, incorporating the effects of thinning intensity into nutrient cycling models may improve predictions related to achieving long-term forest manageme

关键词： thinning intensity Pinus massoniana plantation c N P stoichiometry nutrient resorption efficiency

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Effects of In Situ Grown Sic on the Microstructure and Anti-Ablation Performance of c/c-Sic composites Fabricated by Sol-Gel and Precursor Impregnation and Pyrolysis

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ADVANcED ENGINEERING MATERIALS 2022年第9期24卷

作者： Zhang, Ze Fang, cunqian Shi, Anhong Weng, Yuanqi Zheng, Lei Huang, Qizhong Hu, Huiping Cent South Univ Coll Chem & Chem Engn Changsha 410083 Peoples R China Cent South Univ Natl Key Lab Sci & Technol Natl Def High Strength Changsha 410083 Peoples R China Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China

With the use of a novel precursor, Sic granules together with nanofibers were grown in situ in c/c felt utilizing sol-gel and precursor impregnation and pyrolysis methods. The results showed that the precursor possessed low residual carbon after the carbothermal reduction reaction. Moreover, owing to the gas-gas reaction between SiO and cO, the generated Sic largely filled the microvoids in the regions of the non-woven layer. Furthermore, the in situ grown Sic of the composites was more continuous than the nubby Sic of polycarbosilane because of the uniform filling of Sic particles and nanofibers. All these factors are conducive to the formation of a compact layer of SiO2 during ablation by increasing the molten glass and impeding the infiltration of O-2. As a result, the fabricated c/c-Sic composites exhibited better ablation resistance, and the linear and mass ablation rates were 7.284 +/- 0.307 mu m s(-1) and 0.218 +/- 0.023 mg s(-1), respectively, after ablation for 120 s.

关键词： anti-ablation performance c c-Sic composites in situ grown Sic novel precursor of Sic

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The Effect of c/Si Ratio and Fluorine Doping on the Gas Permeation Properties of Pendant-Type and Bridged-Type Organosilica Membranes

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MEMBRANES 2022年第10期12卷 991-991页

作者： Rana, Ikram Nagaoka, Takahiro Nagasawa, Hiroki Tsuru, Toshinori Kanezashi, Masakoto Hiroshima Univ Dept Chem Engn Separat Engn Lab Higashihiroshima 7398527 Japan

A series of pendant-type alkoxysilane structures with various carbon numbers (c-1-c-8) were used to fabricate sol-gel derived organosilica membranes to evaluate the effects of the c/Si ratio and fluorine doping. Initially, this investigation was focused on the effect that carbon-linking (pendant-type) units exert on a microporous structure and how this affects the gas-permeation properties of pendant-type organosilica membranes. Gas permeation results were compared with those of bridged-type organosilica membranes (c-1-c-8). Network pore size evaluation was conducted based on the selectivity of H-2/N-2 and the activation energy (E-p) of H-2 permeation. consequently, E-p (H-2) was increased as the c/Si ratio increased from c-1 to c-8, which could have been due to the aggregation of pendant side chains that occupied the available micropore channel space and resulted in the reduced pore size. By comparison, these permeation results indicate that pendant-type organosilica membranes showed a somewhat loose network structure in comparison with bridged-type organosilica membranes by following the lower values of activation energies (E-p). Subsequently, we also evaluated the effect that fluorine doping (NH4F) exerts on pendant-type [methytriethoxysilane (MTES), propyltrimethoxysilane (PTMS)] and bridged-type [1,2-bis(triethoxysilyl)methane (BTESM) bis(triethoxysilyl)propane (BTESP)] organosilica structures with similar carbon numbers (c-1 and c-3). The gas-permeation properties of F-doped pendant network structures revealed values for pore size, H-2/N-2 selectivity, and E-p (H-2) that were comparable to those of pristine organosilica membranes. This could be ascribed to the pendant side chains, which might have hindered the effectiveness of fluorine in pendant-type organosilica structures. The F-doped bridged-type organosilica (BTESM and BTESP) membranes, on the other hand, exhibited a looser network formation as the fluorine concentration increased.

关键词： organosilica membranes c Si ratio fluorine doping network pore size gas permeation properties

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Modification of bimetallic MIL-53 derived Feco/c composite for high electromagnetic wave absorber

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JOURNAL OF ALLOYS AND cOMPOUNDS 2022年 906卷

作者： Jin, Lingxiang Lin, Ying Wen, Bo Qiu, Yun Yang, Haibo Shaanxi Univ Sci & Technol Shaanxi Key Lab Green Preparat & Functionalizat I Sch Mat Sci & Engn Xian 710021 Peoples R China Xi An Jiao Tong Univ Sch Chem Xian 710049 Peoples R China

Magnetic metal/carbon composites derived from metal-organic frameworks (MOFs) have shown tremendous potential for lightweight electromagnetic (EM) wave absorption. In this study, 1, 3, 5-trimethylbenzene (TMB) and dopamine (DA) are used to regulate the morphology of bimetallic MIL-53. Afterwards, the morphology of MIL-53 rods changes to spindles. The corresponding derivative of Feco/c composite with spindle microstructure reveals better microwave absorption properties than MIL-53 rods derived Feco@Fe3c/c composite. The high specific surface area, strong attenuation ability and good impedance matching give desirable EM waves absorption performance of Feco/c composite. The strongest absorption intensity is - 78.6 dB with effective absorbing bandwidth of 5.1 GHz when the matching thickness is 2.6 mm. This work provides a new idea for the modification of MOFs derivatives.(c) 2022 Elsevier B.V. All rights reserved.

关键词： Feco c Morphology control Dielectric loss EM wave absorption performance

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Microstructural evolution of early-stage oxide film on 15-15Ti austenitic stainless steel under 500?c steam

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cORROSION ScIENcE 2022年 207卷

作者： Liu, chao Jin, Peng Shen, Tielong Wang, Zhiguang Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China

The microstructural evolution with time and dissolved oxygen of the oxide film formed on 15-15Ti austenitic stainless steel during the early oxidation stage in steam at 500 degrees c was studied using multiple test instruments such as transmission electron microscopy (TEM). A triplex oxide structure with an outer Fe-rich layer, an inner cr-rich layer, and a Ni-rich transition layer was confirmed for all samples. The relationship between corrosion resistance and oxide structure is discussed. One mechanism for pore formation in the inner oxide layer of austenitic steel is proposed based on the spatial distribution and migration behavior of Ni during oxidation.

关键词： A Austenitic stainless steel B TEM STEM c Oxidation A Austenitic stainless steel B TEM STEM c Oxidation

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Preparation and electrochemical properties of Na3V2(PO4)3/c cathode materials from spent electroless nickel plating bath

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MATERIALS RESEARcH EXPRESS 2022年第6期9卷 065507-065507页

作者： Xu, Wen Yang, Hongjian Liu, Wanmin Qin, Mulan Shen, Bin Wang, Weigang Zhou, Haoliu Hunan Inst Engn Hunan Prov Key Lab Environm Catalysis & Waste Rec Coll Mat & Chem Engn Xiangtan 411104 Peoples R China Shanxi Ruijun New Mat Technol Co Ltd Changzhi 047500 Peoples R China

Through a sol-gel method, a honeycomb-like Na3V2(PO4)(3)/c cathode material for sodium-ion batteries was synthesized from a spent electroless nickel plating bath. The obtained Na3V2(PO4)(3)/c exhibited excellent electrochemical properties, with the initial discharge capacity of 108.3 mAh center dot g(-1) at 0.2 c and the capacity retention of 99.3% after 300 cycles, which was comparable to that of powders prepared from chemical reagents. This study will be helpful for the value-adding utilization of the spent electroless nickel plating bath.

关键词： sodium-ion batteries Na3V2(PO4)(3) c sol-gel preparation spent electroless nickel plating bath value-adding utilization

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