Advanced Composites Letters最新文献_第10页

Experimental and numerical analysis of heat convection in cylindrical composite structures with internal defects 含内缺陷圆柱复合材料结构热对流的实验与数值分析

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519879699

A. Muc, M. Chwał, A. Stawiarski

引用次数: 0

Analysis of metallographic structure and hardness of magnesium alloy area using friction stir welding 搅拌摩擦焊镁合金区金相组织及硬度分析

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519872764

Wang Hongfeng, Z. Dunwen, Liu Shengrong, Song Weiwei

引用次数: 1

Effect of chemical admixtures on the properties of grouting materials with high-volume mineral materials 化学外加剂对大体积矿物材料灌浆材料性能的影响

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/2633366X19895285

Xianjun Li

{"title":"Effect of chemical admixtures on the properties of grouting materials with high-volume mineral materials","authors":"Xianjun Li","doi":"10.1177/2633366X19895285","DOIUrl":"https://doi.org/10.1177/2633366X19895285","url":null,"abstract":"Based on the preparation of grouting materials with high-volume mineral admixtures, the effects of chemical admixtures including early-strength components and retarding components on the grouts with volume mineral admixtures were investigated. The results show that early-strength components have little effect on the grouts with high-volume mineral admixtures. Retarding component sodium gluconate does not play a great role for the grouts with high-volume mineral admixtures. However, the incorporation of borax and sodium tripolyphosphate can greatly improve the properties of the grouts, mainly due to their composite effect. The appropriate compound content is 0.4 wt% borax and 0–0.2 wt% sodium tripolyphosphate of cementitious materials. When 0.4 wt% borax and 0.2 wt% sodium tripolyphosphate were added to the grouts with volume mineral admixtures, initial fluidity and 30-min fluidity are 340 mm, and 1-, 3-, and 28-day compressive strength are, respectively, 41.6, 57.1, and 81.5 MPa. These values far exceed the standard requirements. It also shows that early-strength components and sodium gluconate can be neglected when high-volume mineral admixtures are added to the grouts.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/2633366X19895285","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43620334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the flame retardancy of nano-Sb2O3/BPS-PBT composites 纳米sb2o3 /BPS-PBT复合材料的阻燃性研究

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519865743

Jianlin Xu, Bingxue Ma, L. Niu, Chengcheng Xu, Zhou Chen, Yong-gang Lin

引用次数: 2

The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase 以模板为唯一碳相源直接碳化制备的介孔二氧化硅/碳复合材料的吸附性能

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/2633366X19895993

N. Gerasymenko, R. P. Reyes, M. H. Espinosa, E. S. Mora, V. Petranovskii

{"title":"The adsorbing properties of mesoporous silica/carbon composites prepared by direct carbonization of the template as the sole source of the carbon phase","authors":"N. Gerasymenko, R. P. Reyes, M. H. Espinosa, E. S. Mora, V. Petranovskii","doi":"10.1177/2633366X19895993","DOIUrl":"https://doi.org/10.1177/2633366X19895993","url":null,"abstract":"The objective of this study was to prepare composite materials based on mesoporous silica/carbon, functionalized with acid groups, and also to analyze its application in the adsorption of dyes. These materials were prepared in a simplified unconventional route. The carbon phase was generated by direct carbonization of organic surface-active templates, which are used in the synthesis of meso-ordered silicas. The resulting composite materials were characterized in terms of their structure, texture, chemical composition, and surface chemical reactivity. Data obtained demonstrate uniform and ordered porous structures of approximately 70–200 Å, with a developed surface area of approximately 400–500 m2 g−1 and a large total pore volume of approximately 1.0–1.5 cm3 g−1. The potential of synthesized composite materials functionalized by oxygenated groups as adsorbents of cationic dyes was analyzed, the values of the maximum adsorption capacity between 317 mg g−1 and 245 mg g−1 were obtained. The adsorbing properties of silica/carbon composite materials obtained in an unconventional method using an organic template as the only carbon source were compared with the properties of silica/carbon composite materials manufactured by the conventional method using external precursors of the carbon phase. It has been proved that composite materials synthesized using an unconventional procedure, despite the fact that they have a lower carbon phase content, exhibit adsorption properties that are comparable or superior to materials elaborated in the traditional way, removing up to 85–90% of methylene blue from water contaminated with dye.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/2633366X19895993","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49222118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Research on operating parameters of T-groove cylindrical gas film seal based on computational fluid dynamics 基于计算流体力学的T型槽圆柱气膜密封工作参数研究

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519864373

Junfeng Sun, M. Liu, Zhen Xu, Taohong Liao

{"title":"Research on operating parameters of T-groove cylindrical gas film seal based on computational fluid dynamics","authors":"Junfeng Sun, M. Liu, Zhen Xu, Taohong Liao","doi":"10.1177/0963693519864373","DOIUrl":"https://doi.org/10.1177/0963693519864373","url":null,"abstract":"Cylindrical gas film sealing technology is a new type of dry gas sealing technology. Compared with the face gas film sealing technology, the cylindrical gas film seal presents a strong floating property, which can reduce the vibration and thermal deformation of the rotor system. In this article, the effect of operating parameters such as speed, pressure difference and viscosity on the T-groove gas cylindrical film seal performance are studied in detail by the method of control variable in computational fluid dynamics software, and pressure distribution, gas film stiffness, leakage, leakage stiffness ratio and hydrodynamic force are analysed. Results show that with the increase of the rotational speed, static pressure, hydrodynamic force and film stiffness increase, but leakage decreases first and then increases. Furthermore, the results indicate that with the increase of pressure difference, the static pressure, leakage and hydrodynamic force increase. In addition, the simulations show that when the viscosity increases, the maximum pressure and film stiffness increase, but the leakage decreases. This indicates that as the rotational speed increases, the hydrodynamic effect and the amount of gas overflow in the axial direction increase, resulting in an increase of leakage. Lastly, the results also show that when the pressure difference increases, both the radial and axial gas flow rates increase, resulting in an increase in both the film stiffness and the leakage. With the increase of viscosity, the viscous shear force and fluid hydrodynamic force increase, resulting in the increase of the gas film stiffness. This study can provide a theoretical basis in industrial applications for setting the operating parameters and serving as a reference.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0963693519864373","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47671038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Nanoindentation on the bio-inspired high-performance nature composite by molecular dynamics method 分子动力学方法在仿生高性能天然复合材料上的纳米压痕

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519860162

A. N. Masir, A. Darvizeh, A. Zajkani

{"title":"Nanoindentation on the bio-inspired high-performance nature composite by molecular dynamics method","authors":"A. N. Masir, A. Darvizeh, A. Zajkani","doi":"10.1177/0963693519860162","DOIUrl":"https://doi.org/10.1177/0963693519860162","url":null,"abstract":"The determination of mechanical properties at the nanoscale is of such importance today that researchers pay special attention to it. Discovering the mechanical properties of biological composite structures in the nanoscale is much interesting today. Top neck mollusk shells are among biomaterial nanocomposites that their layered structures are composed of organic and inorganic materials. Since the nanoindentation process is known as an efficient method to determine mechanical properties like elastic modulus and hardness in small scale, therefore, due to some limitations of considering all peripheral parameters, particular simulations of temperature effect in the atomic scale are considerable. The present article provides a molecular dynamics approach for modeling the nanoindentation mechanism with three types of pyramidal, cubic, and spherical indenters at different temperatures of 173, 273, 300, and 373°K. Based on load-indentation depth diagrams and Oliver–Pharr equations, research findings indicate that the temperature has weakened the power between the biological atoms; this leads to reduced mechanical properties. An increase in temperature causes a reduction in elastic modulus and hardness. There was correspondence between the results obtained from the spherical indenter and experimental data. This study can be regarded as a novel benchmark study for further research studies which tend to consider structural responses of the various bio-inspired nanocomposites.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0963693519860162","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47598093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Suppression efficacy of lignosulfonate/mercerized cotton fiber composite against cancer cell’s activities 木质素磺酸盐/丝光棉纤维复合材料对癌症细胞活性的抑制作用

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519875974

A. El‐kott, Aishah F. A. Syef, M. Alshehri, Sahar I Al Dessouky, S. Keshk

{"title":"Suppression efficacy of lignosulfonate/mercerized cotton fiber composite against cancer cell’s activities","authors":"A. El‐kott, Aishah F. A. Syef, M. Alshehri, Sahar I Al Dessouky, S. Keshk","doi":"10.1177/0963693519875974","DOIUrl":"https://doi.org/10.1177/0963693519875974","url":null,"abstract":"Lignosulfonate (LS)/mercerized cotton composite was prepared to study the LS suppressive possibility to control malignant cell activities to facilitate chemotherapy treatment. The composite was characterized by cross-polarized/magic angle spinning 13C nuclear magnetic resonance (NMR) spectrometry and scanning electron microscope (SEM). 13C NMR spectra and SEM indicated that the presence of LS increased crystallinity and porosity of mercerized cellulose, respectively. Furthermore, the composite efficacy against cancer cell activity was evaluated by cytotoxicity for malignant cell line HCT116, HepG2, and MCF-7. The cancer cells thrive in an acidic environment and they do not survive in normal or alkaline media. The release of LS was intended at acidic pH, in which, the acidity increased due to the activity of the cancer cells that activate the LS released from the mercerized cotton into the media. Therefore, this release process reduced the activity of cancer cells. The released LS kept cancer cells in a low activity via decreasing acidity. Hence, the composite may not eliminate the cancer cells, but it reduces the activity of cancer cells.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0963693519875974","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48324802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Salt template zirconia reinforcing particles as possible reinforcement for PMMA matrix composite 盐模板氧化锆增强颗粒作为PMMA基复合材料的可能增强材料

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/0963693519879696

A. Elmadani, N. Tomić, I. Radovic, Marija Vuksanovic, D. Stojanović, R. J. Heinemann, V. Radojević

{"title":"Salt template zirconia reinforcing particles as possible reinforcement for PMMA matrix composite","authors":"A. Elmadani, N. Tomić, I. Radovic, Marija Vuksanovic, D. Stojanović, R. J. Heinemann, V. Radojević","doi":"10.1177/0963693519879696","DOIUrl":"https://doi.org/10.1177/0963693519879696","url":null,"abstract":"To obtain flakes like zirconia particles at relatively low temperature, the synthesis method for producing zirconia particles on the surface of salt particles that serve as a template is examined. The produced particles are incorporated as reinforcement in the poly(methyl methacrylate) matrix to obtain a composite material. The particles were characterized by the X-ray diffraction, Fourier-transform infrared spectroscopy, and image analysis. The morphology of the particles and composites was examined using a field emission scanning electron microscope. Composites prepared with synthesized particles were compared to those containing commercial zirconia particles to estimate the possibility of use of synthesized particles as reinforcement. The influence of the 1 wt% of zirconia particles in composite material on the mechanical properties was studied using microhardness measurements and dynamic mechanical analysis. The results obtained show that the addition of 1 wt% of zirconia particles increases the mechanical properties of the composite relative to the pure polymer matrix.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0963693519879696","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49067192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Computed tomography evaluation of palatal form in the transversal and sagittal fabrication process and the effect of first molar and canine crown angulations 计算机断层扫描评估腭在横向和矢状面制造过程中的形态以及第一磨牙和犬牙冠成角的影响

IF 2.4 4区材料科学

Advanced Composites Letters Pub Date : 2019-01-01 DOI: 10.1177/2633366X19896807

Taljabini Yamen, Oz Ulas

{"title":"Computed tomography evaluation of palatal form in the transversal and sagittal fabrication process and the effect of first molar and canine crown angulations","authors":"Taljabini Yamen, Oz Ulas","doi":"10.1177/2633366X19896807","DOIUrl":"https://doi.org/10.1177/2633366X19896807","url":null,"abstract":"The purpose of this study was to investigate changes in the palatal form in patients treated with and without premolar extractions. A total of 40 patients who had undergone orthodontic treatment (extraction and non-extraction) were divided into two groups coequally. Retrospective records were collected at pretreatment and at bracket removal. Stone casts were scanned by cone-beam tomography; linear and angular measurements on the three-dimensional model were then performed for both the sagittal direction and the transverse direction. Paired t-tests for dependent samples were used to compare results within the same group, and t-tests for independent samples were used to compare results between groups. A p value less than 0.05 was considered statistically significant. The sagittal palatal form increased in the non-extraction group, whereas it decreased in the extraction group. There was a decrement in the transversal palatal form in both groups. There were no differences or changes in molar or canine crown angulation in the non-extraction group. Conversely, distal tipping of the upper right first molar and distal tipping and lingual movement of both left and right upper canines were observed in the extraction group.","PeriodicalId":55551,"journal":{"name":"Advanced Composites Letters","volume":"28 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/2633366X19896807","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41444049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0