Materials最新文献_第3页

Antibiofilm Efficacy of Calcium Silicate-Based Endodontic Sealers 硅酸钙牙髓封闭剂的抗生物膜功效

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163937

M. Ruiz-Linares, Vsevolod Fedoseev, C. Solana, Cecilia Muñoz-Sandoval, C. Ferrer-Luque

{"title":"Antibiofilm Efficacy of Calcium Silicate-Based Endodontic Sealers","authors":"M. Ruiz-Linares, Vsevolod Fedoseev, C. Solana, Cecilia Muñoz-Sandoval, C. Ferrer-Luque","doi":"10.3390/ma17163937","DOIUrl":"https://doi.org/10.3390/ma17163937","url":null,"abstract":"Background: Using endodontic sealers with long-term antimicrobial properties can increase the success of endodontic treatment. This study aimed to assess the antimicrobial activity over time of two calcium silicate (CS)-based sealers, AH Plus Bioceramic and BioRoot RCS, and to compare them with an epoxy resin-based sealer, AH Plus Jet, against mature polymicrobial biofilms grown on human radicular dentin. Methods: The antimicrobial activity of the sealers was tested using a direct contact test after 1 and 6 weeks of contact with the biofilms. Cell viability was determined by the adenosine triphosphate (ATP) method and flow cytometry (FC). The results of the ATP test were analyzed using an ANOVA with Welch’s correction, followed by the Games–Howell test. The number of cells with damaged membranes obtained by FC in each period was compared by means of an ANOVA and Duncan’s test. For the comparison between times, a Student’s t-test was used. Results: Globally, after a week of contact, the epoxy resin-based sealer obtained the best results. However, at 6 weeks, the two CSs showed the highest antimicrobial efficacy, with a significant increase in this activity over time. Conclusions: Calcium silicate-based sealers exert long-term antimicrobial activity against endodontic biofilms.","PeriodicalId":503043,"journal":{"name":"Materials","volume":"18 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ad Hoc Modeling of Rate-Dependent Adhesion in Indentation Relaxation Testing 在压痕松弛测试中建立速率依赖性粘附的临时模型

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163944

I. Argatov, I. Lyashenko, V. L. Popov

引用次数: 0

Terahertz Transmission through a Gold Mirror or Electrode 通过金镜或电极的太赫兹传输

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163942

F. Novelli

引用次数: 0

Design and Microwave Absorption Performance Study of SiC-Fe3O4 Emulsified Asphalt Mixture SiC-Fe3O4 乳化沥青混合物的设计与微波吸收性能研究

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163935

Xiangyu Jiang, Wen Xu, Yixing Chen, Jiaqi Li

{"title":"Design and Microwave Absorption Performance Study of SiC-Fe3O4 Emulsified Asphalt Mixture","authors":"Xiangyu Jiang, Wen Xu, Yixing Chen, Jiaqi Li","doi":"10.3390/ma17163935","DOIUrl":"https://doi.org/10.3390/ma17163935","url":null,"abstract":"To address the challenges of slow curing speed and suboptimal microwave absorption during the paving of cold-mixed and cold-laid asphalt mixtures, this study introduces SiC-Fe3O4 composite material (SF) into emulsified asphalt mixtures to enhance microwave absorption and accelerate curing via microwave heating. Initially, based on the maximum density curve theory, an appropriate mineral aggregate gradation was designed, and the optimal ratio of emulsified asphalt mixture was determined through mixing tests, cohesion tests, wet wheel wear tests, and load wheel sand adhesion tests. Subsequently, the influence of SF content on the mixing performance of emulsified asphalt mixtures was analyzed through mixing and consistency tests. Finally, the microwave absorption performance of the mixture was evaluated by designing microwave heating tests under different conditions, using temperature indicators and quality indicators. The experimental results indicate that when SF content ranges from 0% to 4%, the mixing performance of the emulsified asphalt mixture meets specification requirements. The dosage of SF, SF composite ratio, and microwave power significantly impact microwave absorption performance, whereas environmental temperature has a relatively minor effect. The optimal mix ratio for the emulsified asphalt mixture is mineral aggregate:modified emulsified asphalt:water:cement = 100:12.8:6:1. The ideal SF dosage is 4%, with an optimal SiC to Fe3O4 composite ratio of 1:1, and a suitable microwave power range of 600–1000 W.","PeriodicalId":503043,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antifungal Effect of Poly(methyl methacrylate) with Farnesol and Undecylenic Acid against Candida albicans Biofilm Formation 含有法呢醇和十一烯酸的聚甲基丙烯酸甲酯对白色念珠菌生物膜形成的抗真菌作用

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163936

Milica Išljamović, D. Bonvin, Milena Milojević, Simona Stojanović, M. Spasić, B. Stojković, P. Janošević, Suzana A Otasevic, M. M. Ebersold

{"title":"Antifungal Effect of Poly(methyl methacrylate) with Farnesol and Undecylenic Acid against Candida albicans Biofilm Formation","authors":"Milica Išljamović, D. Bonvin, Milena Milojević, Simona Stojanović, M. Spasić, B. Stojković, P. Janošević, Suzana A Otasevic, M. M. Ebersold","doi":"10.3390/ma17163936","DOIUrl":"https://doi.org/10.3390/ma17163936","url":null,"abstract":"The control of Candida albicans biofilm formation on dentures made of poly(methyl methacrylate) (PMMA) is an important challenge due to the high resistance to antifungal drugs. Interestingly, the natural compounds undecylenic acid (UDA) and farnesol (FAR) both prevent C. albicans biofilm formation and could have a synergetic effect. We therefore modified PMMA with a combination of UDA and FAR (UDA+FAR), aiming to obtain the antifungal PMMA_UDA+FAR composites. Equal concentrations of FAR and UDA were added to PMMA to reach 3%, 6%, and 9% in total of both compounds in composites. The physico-chemical properties of the composites were characterized by Fourier-transform infrared spectroscopy and water contact angle measurement. The antifungal activity of the composites was tested on both biofilm and planktonic cells with an XTT test 0 and 6 days after the composites’ preparation. The effect of the UDA+FAR combination on C. albicans filamentation was studied in agar containing 0.0125% and 0.4% UDA+FAR after 24 h and 48 h of incubation. The results showed the presence of UDA and FAR on the composite and decreases in the water contact angle and metabolic activity of both the biofilm and planktonic cells at both time points at non-toxic UDA+FAR concentrations. Thus, the modification of PMMA with a combination of UDA+FAR reduces C. albicans biofilm formation on dentures and could be a promising anti-Candida strategy.","PeriodicalId":503043,"journal":{"name":"Materials","volume":"25 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-Objective Optimization of Injection Molding Parameters for Manufacturing Thin-Walled Composite Connector Terminals 多目标优化制造薄壁复合材料连接器端子的注塑成型参数

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163949

Mingbo Tan, Size Peng, Yingfei Huo, Maojun Li

引用次数: 0

Modeling Strain Hardening of Metallic Materials with Sigmoidal Function Considering Temperature and Strain Rate Effects 用考虑温度和应变率效应的西格玛函数建立金属材料应变硬化模型

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163950

Boyu Pan, F. Shen, Sanjay Raghav Sampathkumar, Sebastian Münstermann

引用次数: 0

Study on the Binding Behavior of Chloride Ion and Ettringite in Nano-Metakaolin Cement by Seawater Mixing and Curing Temperatures 海水搅拌和固化温度对纳米高岭土水泥中氯离子和绿泥石结合行为的研究

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163943

Zhisheng Fang, Shiyi Zhang, Wenjie Qi, Yingfang Fan, Surendra P. Shah, Junjie Zheng

{"title":"Study on the Binding Behavior of Chloride Ion and Ettringite in Nano-Metakaolin Cement by Seawater Mixing and Curing Temperatures","authors":"Zhisheng Fang, Shiyi Zhang, Wenjie Qi, Yingfang Fan, Surendra P. Shah, Junjie Zheng","doi":"10.3390/ma17163943","DOIUrl":"https://doi.org/10.3390/ma17163943","url":null,"abstract":"Mixing cement with seawater will cause the hydration process of cement to be different from that of ordinary cement, which will significantly affect cement’s mechanical properties and durability. This article investigates the effects of chloride ion concentration, curing temperature, and nano-metakaolin content on the evolution process of Friedel’s salts and ettringite (AFt) crystals in cement pastes. The study was conducted using X-ray diffraction (XRD), thermal analysis (TG), scanning electron microscopy (SEM), and mercury-intrusion porosimetry (MIP). The results show that chlorine salt can increase the production of Friedel’s salt and ettringite, and the delayed AFt production increases by up to 27.95% after the addition of chlorine salt, which has an adverse effect on cement-based materials. Increasing the curing temperature and increasing the nano-metakaolin dosage increased the generation of Friedel’s salt and decreased the delayed AFt generation, which resulted in a decrease in the length and diameter of the AFt crystals. After 28 days of high-temperature curing and the addition of nano-metakaolin, Friedel’s salt production increased by 13.40% and 14.34%, respectively, and ettringite production decreased by 9.68% and 7.93%, respectively. Increasing the curing temperature and adding nano-metakaolin can reduce the adverse effect of delayed ettringite increases due to chloride ion binding.","PeriodicalId":503043,"journal":{"name":"Materials","volume":"46 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Cement Dosage, Curing Time, and Water Dosage on the Strength of Cement-Stabilized Aeolian Sand Based on Macroscopic and Microscopic Tests 基于宏观和微观试验的水泥用量、固化时间和水用量对水泥稳定土砂强度的影响

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163946

Heng Yang, Zengzhen Qian, Bing Yue, Zilu Xie

{"title":"Effects of Cement Dosage, Curing Time, and Water Dosage on the Strength of Cement-Stabilized Aeolian Sand Based on Macroscopic and Microscopic Tests","authors":"Heng Yang, Zengzhen Qian, Bing Yue, Zilu Xie","doi":"10.3390/ma17163946","DOIUrl":"https://doi.org/10.3390/ma17163946","url":null,"abstract":"Aeolian sand is distributed worldwide, exhibiting poor grading, low cohesion, and loose structure. Infrastructure construction in desert areas sometimes requires stabilization of the sand, with cement as the primary curing agent. This study first employed orthogonal experiments to evaluate critical factors, e.g., curing time, cement dosage, and water dosage, affecting the unconfined compressive strength (UCS) of the aeolian sand stabilized with cement (ASC). Each of the aforementioned factors were set at five levels, namely curing time (7, 14, 28, 60, and 90 days), cement dosage (3%, 5%, 7%, 9%, and 11%), and water dosage (3%, 6%, 9%, 12%, and 15%), respectively. The water and cement dosages were percentages of the mass of the natural aeolian sand. The results indicated that the sensitivity of the influencing factors on the UCS of ASC was cement dosage, curing time, and water dosage in descending order. The UCS of ASC positively correlated with curing time and cement dosage, while it first increased and then decreased with the water dosage increase. The optimal conditions were 90 days’ curing time, 11% cement dosage, and 9% water dosage. The microscopic analyses of ASC using optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) revealed that hydration products enhanced strength by bonding loose particles and filling pores, thereby improving compaction. The quantity and compactness of hydration products in the aeolian–cement reaction system increased with the increases in cement dosage and curing time, and low water dosage inhibited the hydration reaction. This study can provide insights into the stabilization mechanism of aeolian sand, aiding infrastructure development in desert regions.","PeriodicalId":503043,"journal":{"name":"Materials","volume":"44 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling of the Particle Abrasion Process and a Discrete Element Method Study of Its Shape Effect 颗粒磨损过程建模及其形状效应的离散元素法研究

Materials Pub Date : 2024-08-08 DOI: 10.3390/ma17163947

Zhengbo Hu, Junhui Zhang, Xin Tan, Hao Yang

引用次数: 0