Materials Express最新文献

{"title":"Physical, antimicrobial, and release profiles of orthodontic adhesives modified with chlorhexidine and cetylpyridinium chloride","authors":"A. Alshehri, N. Albar","doi":"10.1166/mex.2024.2652","DOIUrl":"https://doi.org/10.1166/mex.2024.2652","url":null,"abstract":"The aim of the present study was to evaluate the properties (physical, antimicrobial, and release profiles) by using modified orthodontic adhesives on extracted teeth. Three primers, Transbond (Tx), Transbond-Chlorhexidine (Tx-CHx), and Transbond-Cetylpyridinium chloride (Tx-CTP), containing\u0000 antibacterial agents CHx and CTP, were tested against Streptococcus mutans (Sm) in planktonic and biofilm phases. Their antimicrobial activities (biofilm and growth assays), affected by water aging, were analyzed along with shear bond strength and mode of fracture after bonding\u0000 brackets onto bovine incisors. Tx-CHx demonstrated superior antimicrobial activity against in both planktonic and biofilm states, completely inhibiting their growth and biofilm formation. This effectiveness persisted after thermocycling. Conversely, Tx-CTP showed a positive outcome against\u0000 microbial activity compared to Tx. Shear bond strength (SBS) (Tx–11.21±1.72; Tx-CTP–12.48±2.50; Tx-CHx–11.57±2.28) and bond failure interface showed no significant differences among the three primers. Adding CHx and CTP to an orthodontic primer could\u0000 potentially safeguard enamel from demineralization without negatively impacting its structural characteristics.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141023979","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}

{"title":"Application of microencapsulated phase change materials in prefabricated building projects based on building information modeling technology","authors":"Shikun Wang","doi":"10.1166/mex.2024.2658","DOIUrl":"https://doi.org/10.1166/mex.2024.2658","url":null,"abstract":"Faced with the rapidly increasing urban population, there is a surge in demand for building construction, accompanied by an incessant rise in building energy consumption. To promote sustainable development and mitigate building energy consumption, this study proposes the utilization\u0000 of microencapsulated phase change materials in prefabricated buildings through the integration of building information modeling. We prepare polymethyl methacrylate/n-eicosane/wood cellulose nanocrystal microcapsules using Pickering emulsion through the solvent evaporation method. The results\u0000 showed that the material exhibits optimal comprehensive performance at a core–shell ratio of 2:1, with a melting enthalpy of 152.10 J/g and a coating rate of 60.27%. However, when the core–shell ratio increases to 2.5:1, significant performance degradation occurs due to phase change\u0000 material leakage. The materials show excellent cycling performance in cold-hot cycling tests, maintaining their melting enthalpy value above 97% even after 100 cycles. Moreover, materials with a core–shell ratio of 2:1 exhibit good thermal stability up to high temperatures (160 °C).\u0000 In conclusion, this study has great significance for advancing the progress of prefabricated buildings and sustainable buildings.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141057068","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}

{"title":"Determination of hexogen recovered from scrapped 2-chlorobenzalmalononitrile mixed explosives by gas chromatography","authors":"Dandan Liu, Yongyang Mao, Xing Fang, Chen Li, Xianjun Xie, Dengzhi Fang","doi":"10.1166/mex.2024.2670","DOIUrl":"https://doi.org/10.1166/mex.2024.2670","url":null,"abstract":"This study focuses on the extraction of Hexogen (RDX) from decommissioned CS mixed explosives using the Soxhlet extraction method. Recrystallization using a solution of rtnanol is utilized to purify the extract and remove impurities, such as CS. Qualitative analysis is conducted using\u0000 Fourier transform infrared spectroscopy and a melting point tester. Additionally, gas chromatography is employed for qualitative and quantitative analysis of the recovered RDX. The experimental results demonstrate that the recovered RDX exhibits a strong linear relationship at concentrations\u0000 ranging from 500 mg/L to 6000 mg/L, with a correlation coefficient of r = 0.9999 and a relative standard deviation (RDS) of ≤5% (n = 6). Furthermore, the purity of the recovered RDX can reach 100% through secondary recrystallization using ethanol. The quantitative analysis\u0000 of RDX by gas chromatography offers the advantages of operating cylinder, high accuracy and high sensitivity.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141048040","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}

{"title":"Adaptability and crack resistance effect of continuous fiber anti-crack composite sealing layer","authors":"Zhiyong Li, Changfeng Hao, Junling Su","doi":"10.1166/mex.2024.2657","DOIUrl":"https://doi.org/10.1166/mex.2024.2657","url":null,"abstract":"Traditional anti-crack seals are greatly affected by temperature effects and lack adaptability, making them vulnerable under extreme conditions. Therefore, a novel composite sealing layer material for crack prevention was proposed. This material combines fibers with a fine anti-slip\u0000 wear layer, which is placed on top of the crushed stone layer. Furthermore, the XFEM was utilized to analyze the adaptability and anti-crack effectiveness of the continuous fiber anti-crack composite sealing layer. The conducted experiments revealed that as the cracks in the base pavement\u0000 widened from 1.0 mm to 2.0 mm, there was an observed increase of 11.4% in stress intensity factor. A variation in the stress intensity factor of 6.3% was observed within the specified range of crack width when the modulus of the continuous fiber anti-crack composite sealing layer was fixed\u0000 at 300 kPa. These results are of vital importance in comprehending the performance of this material in terms of crack resistance adaptability and its influence on practical applications.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141053667","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}

{"title":"Effect of novel composite materials on human injury and rehabilitation training in athletic long jump sports","authors":"Yu’e Liu, Yuyan Liu","doi":"10.1166/mex.2024.2666","DOIUrl":"https://doi.org/10.1166/mex.2024.2666","url":null,"abstract":"Articular cartilage injuries are prevalent in track and field long jump and can affect an athlete’s health. However, current therapeutic options cannot effectively repair the damaged cartilage tissue. It is important to find alternative treatment methods that can provide better\u0000 results for injured athletes. In this study, carbon nanofibers (CNFs) were employed to enhance the properties of hyaluronic acid (HA) and develop nanocomposite hydrogel scaffolds. Bone marrow mesenchymal stem cells extracted from the joints of experimental mice were subsequently loaded onto\u0000 the CNFs-HA scaffolds and evaluated for bioactivity and repair capacity. The TEM photographs of CNFs-MA displayed an orderly arrangement of fibers. Observing the FT-IR spectral characteristics of CNFs-MA revealed a telescopic vibration peak at 1700 cm−1. CNFs-HA demonstrated\u0000 a rapid increase in cartilage damage repair score after 15 days, and at 1 month, the joint damage repair score of CNFs-HA was significantly different from that of pure HA and the untreated group. Based on the foregoing results, it can be inferred that CNFs-HA, as prepared, is biocompatible\u0000 and efficacious in treating articular cartilage tissue injury. Furthermore, this study this study provides a reliable solution for cartilage injury treatment and establishes an experimental basis for its clinical management.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141050889","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}

{"title":"Innovative material applications in clothing design research","authors":"Yueding Zhou, Hongfeng Zhu, Yingna Chao","doi":"10.1166/mex.2024.2659","DOIUrl":"https://doi.org/10.1166/mex.2024.2659","url":null,"abstract":"With the improvement of living standards, there is a growing demand for clothing that offers both comfort and functionality. Nanomaterials have emerged as a hot topic in clothing design due to their unique structure and performance characteristics. In this study, we develop a composite\u0000 nanofabric with exceptional water resistance and breathability using polyurethane (PU), fluorinated polyurethane (FPU), and polyvinyl butyral (PVB), namely PU-FPU-PVB composite nanofabric. The mechanical properties, wettability, waterproofing, and thermal comfort are evaluated. The results\u0000 demonstrate that optimizing the TPU and PVB contents is crucial for obtaining PU-FPU-PVB composite nanofabrics with exceptional performance. Low TPU concentrations fail to provide sufficient viscosity for even dispersion within the hot melt adhesive mesh film, while higher concentrations enable\u0000 better dispersion due to increased viscosity provided by TPU. Additionally, increasing the content of PVB from 0 wt% to 100 wt% led to decreased moisture permeability from 10.5 kg ·m−2 · d−1 to 3.0 kg ·m−2 · d−1\u0000 during thermal comfort testing. Its permeability dropped from 22.5 mm/s to 2.8 mm/s under these conditions. These findings indicate that our designed composite nanofabric exhibits excellent thermal comfort when incorporating appropriate levels of PVB into its composition, making it an ideal\u0000 high-performance material for waterproof and breathable fabrics with superior comfort and functionality in clothing design applications. In conclusion, PU-FPU-PVB composite nanofabrics hold great potential for fostering the innovative advancement of nanomaterials in the realm of clothing design.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141055514","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}

{"title":"Mechanism of lightning damage to glass fiber composite wind turbine blades","authors":"Pengkang Xie, Lingfeng Jiang, Zhenglong Jiang","doi":"10.1166/mex.2024.2672","DOIUrl":"https://doi.org/10.1166/mex.2024.2672","url":null,"abstract":"Wind turbine blades (WTBs) are susceptible to lightning damage, resulting in significant costs for repair and replacement, which poses a considerable economic burden on wind farms. Therefore, this study investigates the mechanism of lightning damage of glass fiber composite (GFC)-WTBs\u0000 to reduce the risk of such damage. The damage of GFC-WTBs caused by lightning strikes was analyzed using a numerical simulation method. The lightning pilot was simulated using high-voltage rod electrodes, and subsequently, the electric field strength and damage area on the blade surface under\u0000 different conditions were measured. Additionally, a simulation model based on finite element analysis was developed to further predict and validate the experimental findings. The results reveal that the maximum electric field intensity was observed in the blade tip. Notably, the electric field\u0000 intensity was found to be over 798,000 V/m when the rod electrode was positioned at a 0-degree angle with the blade tip. Further investigation revealed a non-linear and positive correlation between the damage area of GFC and lightning current amplitude, charge, and specific energy. In conclusion,\u0000 the study provides a comprehensive examination of the relationship between lightning current and the damage to GFC-WTBs, as well as elucidates the mechanism of lightning damage to GFC-WTBs.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141027671","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}

{"title":"MnO2 nanoparticle improves the immunosuppressive characteristics of tumor-associated mesenchymal stromal cells","authors":"Waihin Tin, Xiaoli Zhang, Yijun Zhao, Shiyao Song, Weiming Liu, Jiayin Zheng, Mengyun Xie, Ying Wang, Kexin Sun, Jiatong Dai, Jiajie Chen, Jiafan Cao, Xin Ding, Lisha Mou, Libin Huang","doi":"10.1166/mex.2024.2644","DOIUrl":"https://doi.org/10.1166/mex.2024.2644","url":null,"abstract":"Tumor-associated marrow mesenchymal stem/stromal cells have immunosuppressive effects on immune cells within the tumor microenvironment in various cancers. However, effective treatments targeting these cells are currently limited. Here, we developed a nanoparticle of MnO2\u0000 aiming to inhibit the immunosuppressive properties of Tumor-Associated Marrow Mesenchymal stem/stromal cells. We investigated the physicochemical characteristics of MnO2 and its potential for alleviating hypoxia in IL17 and IFNγ transformed Tumor-Associated Marrow Mesenchymal\u0000 stem/stromal cells. The Tumor-Associated Marrow Mesenchymal stem/stromal cells had higher expression level of chemokines and immunosuppressors, which promotes the progression of tumors and inhibits the immune cells, leading to tumor metastasis and angiogenesis. After treatment of the nanoparticle\u0000 of MnO2, the expression level of chemokines had significantly decreased due to the unique properties of MnO2. Furthermore, the nanoparticle decreased the expression level of immunosuppressors of Tumor-Associated Marrow Mesenchymal stem/stromal cells and rescued the proliferation\u0000 of T lymphocytes cocultured with the cells. In conclusion, our findings demonstrate that MnO2 nanoparticles effectively improve the hypoxic microenvironment and alleviate immunosuppression caused by Tumor-Associated Marrow Mesenchymal stem/stromal cells. The utilization of this\u0000 novel approach exhibits promising potential as a therapeutic strategy for addressing diverse types of cancers.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141054290","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}

{"title":"Reducing the injury of hippocampal vascular endothelial cells after stroke via targeting SIRT1 by butylphthalide","authors":"Xiaoli Yang, Zheng Wang, Yanru Zhang, Jingjing Ji, Mengshuai Wang, Haifang Ma","doi":"10.1166/mex.2024.2647","DOIUrl":"https://doi.org/10.1166/mex.2024.2647","url":null,"abstract":"Butylphthalide (NBP) can inhibit various pathological processes of ischemic stroke. This experiment explored the mechanism of NBP and SIRT1 on damage of hippocampal vascular endothelial cells after stroke. The neurons in the hippocampus of rats were stained with HE, and morphology and\u0000 density of neurons were observed. Flow cytometry, commercial kits and Western blotting detected apoptosis of endothelial cells, levels of antioxidant enzymes and apoptotic proteins, intracellular calcium level and activity of Ca2+-ATPase. The damage to rat nerve cells was alleviated\u0000 by butylphthalide to varying degrees, and the lost parts of rat nerve cells were recovered with decreased Bax and cleaved caspase-3 expression after butylphthalide treatment, and increased Bcl-2 (P <0.05), as well as decreased serum malondialdehyde (MDA) content and activity of catalase\u0000 (CAT) decreased and elevated Superoxide dismutase (SOD) activity (P <0.05). The concentration of calcium ion also decreased but activity of Ca2+-ATPase increased (P <0.05) and mitochondria in the model group appeared with severe vacuolation and swelling. The\u0000 vacuolation and swelling of mitochondria in the treatment group were improved. Additionally, mitochondrial membrane fluidity, potential and rat hippocampal ATPase activity in butylphthalide group were also increased. Compared to normal control group, model group, SIRT1 inhibitor group and\u0000 butylphthalide+SIRT1 inhibitor group had lower levels of SIRT1 and higher p-NF-kB p65/p-IkBα levels. Butylphthalide has a protective effect on hippocampal neurons in stroke rats and can alleviate the damage degree of rat nerve cells.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141040567","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}

{"title":"Effect of nano-silver coated catheter combined with comprehensive care on postoperative infection and rehabilitation in patients after coronary artery bypass grafting (CABG)","authors":"Haiting Yang, Chunmian Guo, Qian Zuo, Wei Jiang, Huanmin Qu, Yani Zhang, Xiaohong Wang, Qianfeng He","doi":"10.1166/mex.2024.2664","DOIUrl":"https://doi.org/10.1166/mex.2024.2664","url":null,"abstract":"Coronary artery bypass grafting (CABG) is an effective treatment method for coronary atherosclerosis, aiming to improve patients’ quality of life and facilitate their return to normal activities after surgery. This study examines the effects of comprehensive nursing intervention\u0000 and application of nano-silver coated catheter on postoperative infection and rehabilitation among patients who have undergone coronary artery bypass grafting. The study included 72 patients, randomly assigned into an intervention group and a control group, with 36 patients in each. The control\u0000 group received standard care, while the intervention group received comprehensive care along with postoperative application of nano-silver coated catheter. The study compared various factors, including the Hamilton Anxiety Scale (HAMA) score, quality of life score, postoperative recovery,\u0000 postoperative infection, satisfaction, and adverse reactions between the two groups. The intervention group exhibited better scores in HAMD, HAMA, PSQI and quality of survival score when compared to the control group. Moreover, the intervention group experienced an earlier time to first bowel\u0000 movement and first defecation after surgery. The intervention group also demonstrated lower rates of urinary protein detection, pathogen detection, and serum inflammatory factor levels compared to the control group. Additionally, the overall incidence of complications in the control group\u0000 was higher at 27.8% compared to 8.3% in the intervention group. Furthermore, the satisfaction level in the intervention group was significantly higher at 97.2%, in contrast to 83.3% in the control group. Overall, comprehensive care combined with the postoperative application of a nano-silver\u0000 coated catheter can effectively address patients’ emotional needs and accelerate recovery. It also reduces the incidence of infection, ultimately enhancing the quality of life and satisfaction levels among patients. This study provides a good nursing plan for the postoperative recovery\u0000 of CABG patients, which is conducive to promoting the speed of postoperative recovery and improving the quality of life of patients.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141037657","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}