Materials Express最新文献

{"title":"Study of the process of preparing amorphous Fe–W(La) alloy plating by induced co-deposition","authors":"Liang Tian, Jidong Li, Hongxuan Xing, Lingfeng Yue, Zhen Li, Yiyong Wang","doi":"10.1166/mex.2023.2511","DOIUrl":"https://doi.org/10.1166/mex.2023.2511","url":null,"abstract":"To obtain high-performance Fe–W alloy plating instead of environmentally hazardous chromium plating, the effects of the cathode material, electrolyte pH, temperature, current density, plating time and rotational speed on the cathode current efficiency and alloy plating are investigated in this paper. The results show that the pH and current density of the plating solution greatly influence the morphology and current efficiency of the cathode. The current efficiency of the cathode can reach 63.56%, and the tungsten content can reach 55% at pH = 8, 60 °C, 12 A/dm 2 , 100 r/min, 75 min, 0.1 mol/l of Fe 2+ and 0.2 mol/l of W 6+ . After XRD analysis, the plating is found to consist of the Fe7W6 amorphous phase. In addition, La is added to the Fe–W alloy under optimal conditions. By analyzing the polarization curve, the potential of the Fe–W(La) alloy is positively shifted by 0.039 V compared with the Fe–W alloy, which has good corrosion resistance.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323173","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":"Improvements in the physicochemical and electrical characteristics of BaO nanoparticles by Cu doping for electronic device applications","authors":"Shoaib Nazir, Jian-Min Zhang, Numan Abbas, Majid Niaz Akhtar, Shahroz Saleem, Kamran Qadir, Oscar Chijioke Nkwazema, Muhammad Nauman, Gideon F. B. Solre","doi":"10.1166/mex.2023.2508","DOIUrl":"https://doi.org/10.1166/mex.2023.2508","url":null,"abstract":"This work demonstrated the effects of Cu 2+ ion doping on the morphological, structural, vibrational, optical, dielectric, and electrical characteristics of barium oxide (BaO) nanoparticles. The XRD analysis revealed the high purity and crystallinity of the prepared Cu doped BaO samples. The crystallite size of the Cu doped BaO nanoparticles was in the range of 6.51 nm to 8.49 nm and increased as the Cu 2+ increased. The SEM micrographs revealed the irregular and spongy like morphology of the Cu doped BaO samples. Agglomeration and porosity were decreased due to the addition of Cu 2+ doping content. Raman spectra revealed the enhancement in the vibrational bands with the Cu 2+ substitution. The FTIR study showed the band obtained between 680–880 cm −1 and were attributed to Ba–O bonding vibrations which confirm the formation of BaO samples. FTIR and Raman spectra results are in the good agreement with XRD results. Optical characteristics were examined through UV-Vis spectra, results revealed that band gap was declined from 1.41 eV to 1.20 eV because the incorporation of Cu 2+ ions in BaO lattice. The electrical properties revealed that conductivity increased from 2.39×10 −7 S cm −1 to 4.44×10 −4 S cm −1 while resistivity decreased from 4.18×10 6 Ω cm to 2.25×10 3 Ω cm with the increase of Cu 2+ content up to 2%. The dielectric study revealed that dielectric constant value reduced with the increase of Cu 2+ concentration. The obtained structural, morphological, vibrational, electrical, dielectric, and optical characteristics of the BaO nanoparticles with Cu 2+ doping content make them a promising material for the electronic device applications.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135324304","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 graphene gas sensor technological convergence PSO-SVM in distribution transformer insulation condition monitoring and fault diagnosis","authors":"Min Zhang, Jian Fang, Hongbin Wang, Fangzhou Hao, Xiang Lin, Yong Wang","doi":"10.1166/mex.2023.2517","DOIUrl":"https://doi.org/10.1166/mex.2023.2517","url":null,"abstract":"This study aims to improve the real-time monitoring and fault diagnosis of distribution transformers by utilizing a combination of five thin film gas detectors, these detectors include metal-modified graphene composite films and SnO 2 /RGO humidity sensors, which were prepared using the hydrothermal method. The experiment focused on investigating humidity and main fault characteristic gases that can reflect the insulation status of transformers. Additionally, a gas sensor array was constructed using a deep confidence neural network model. Based on the analysis of dissolved gas in transformer oil, the study extensively discusses the insulation fault diagnosis model and constructs the transformer fault diagnosis model using various methods including TRM, Particle swarm optimization support vector machine. The results demonstrated that the SnO 2 /RGO thin film humidity sensor exhibited high humidity sensitivity, and the other thin film gas sensors also exhibited good sensitivity. The average accuracy of the three classification methods mentioned is 80%, 92%, and 96%, respectively. These findings highlighted that the vector machine model not only improved the fault diagnosis accuracy but also possessed the characteristics of fewer parameters and a fast rate of convergence. Consequently, it effectively addressed the issue of early diagnosis of potential transformer faults. This study was of significant practical importance for ensuring the secure operation of the power grid.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323174","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":"Properties of waterborne polyurethane chemically modified composite materials and their application in gushing water protection","authors":"Junqi Jin, Qiao He, Shuqin Li, Xuan Zhou, Yongqiao Fang","doi":"10.1166/mex.2023.2531","DOIUrl":"https://doi.org/10.1166/mex.2023.2531","url":null,"abstract":"The absence of organic solutions during the preparation of waterborne polyurethane has resulted in a decline in its overall performance. To address this issue, this study introduces nano zirconia as a modifier to enhance the properties of the polyurethane material. A novel composite material combining waterborne polyurethane and zirconium oxide nanoparticles (ZrO 2 NPs) was proposed, and its performance was experimentally analyzed. The particle size of ZrO 2 @CA is as high as 80 nm, which exceeds the 23 nm of ZrO 2 @MA and the 21 nm of ZrO 2 @AA. Transmission electron microscopy reveals that the emulsion droplets in the composite lotion exhibit excellent spherical uniformity and dispersion. Moreover, there is not a significant difference in size between composite lotions with different zirconia contents. Remarkably, even with a zirconia content of only 0.5 wt%, the specimen exhibits high mechanical properties, with the tensile strength increasing from 11.9 MPa to 14.3 MPa and the elongation at break increasing from 560% to 712%. Additionally, a higher doping amount of ZrO 2 leads to an increased water absorption rate, with the actual water absorption rate rising from 7% to 14.4%. In practical engineering projects A and B, the initial water output of four holes in engineering A is maintained at 48–580 m 3 /h. However, as time progresses, the water output gradually decreases, approaching 0 m 3 /h. In project B, the composite material coating exhibits a tensile strength greater than 15 MPa, reaching 18.26 MPa, which significantly surpasses the performance of the comparison material. Overall, the composite materials demonstrate excellent mechanical and water protection properties, proving to be crucial for practical water inrush protection applications.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323184","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":"Enhanced activity and differentiation of periodontal ligament stem cells by chitosan scaffold and its application in periodontal bone regeneration","authors":"Guoqiang Zhou, Ye Liu, Ding Wang, Fengqiu Zhang","doi":"10.1166/mex.2023.2509","DOIUrl":"https://doi.org/10.1166/mex.2023.2509","url":null,"abstract":"To effectively promote the healing of periodontal bone defect (BD), an innovative approach was adopted, utilizing a combination of chitosan scaffold (CS) and dental pulp stem cells (DPSCs) for periodontal regeneration. The CS was prepared with a pore size of approximately 150 μ m and a porosity of 75%, exhibiting water absorption and swelling rates of 90% and 72%, respectively. Furthermore, the CS exhibited excellent antibacterial properties and effectively inhibited the proliferation activity of Porphyromonas gingivalis , thereby creating a favorable environment for DPSCs to proliferate. In cellular experiments, CS effectively enhanced the activity of DPSCs and demonstrated good osteoconductivity and osteoinduction, effectively enhancing the migration and mineralization ability of DPSCs. In animal studies, the combined application of CS and DPSCs improved the repair of periodontal BD, promoted the regeneration of bone trabecular, and increased bone density at the defect site. Therefore, the combined application of CS and DPSCs holds significant potential for the treatment of periodontal BD.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135324742","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":"Protective effect of luteolin on cardiac ischemia/reperfusion injury in rats with myocardial infarction through ERK/JNK signaling pathway","authors":"Meng Liu, Lei Lu, Ling Yuan, Xiaohu Chen","doi":"10.1166/mex.2023.2524","DOIUrl":"https://doi.org/10.1166/mex.2023.2524","url":null,"abstract":"Due to the increased incidence of cardiovascular diseases, the incidence of cardiac ischemia/reperfusion injury (IRI) is also on the rise. Luteolin has a certain protective effect on myocardium. Therefore, this study focuses on whether luteolin can protect IRI in rats with myocardial infarction. A myocardial infarction rat model was prepared and the isolated heart was treated to induce cardiac ischemia-reperfusion injury. British biodegradable packaging company (BIOPAC) biological signal collector detects myocardial indicators; semi-automatic biochemical analyzer detects myocardial infarct size; hematoxylin-eosin (HE) staining observes pathological changes along with analysis of the levels of ERK, JNK, and Caspase-3 and proliferation and apoptosis of myocardial cells. Luteolin can improve the myocardial index level of rats with myocardial infarction and increase survival rate; the rats in luteolin group have the smallest myocardial infarction area, and the myocardial tissue is tightly arranged, the myocardial collagen is significantly reduced, and the myocardial injury index is significantly reduced. Luteolin inhibited the proliferation, migration and apoptosis of cardiomyocytes. Caspase-3, ERK, and JNK expression in the ERK/JNK agonist group was the most obvious. Their levels were highest in the luteolin+ERK/JNK agonist group (vs. other groups, P <0.05), which was higher than ERK/JNK agonist group. Luteolin can inhibit Caspase-3 expression by activating ERK/JNK signaling pathway, thereby reducing myocardial injury.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135324547","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":"Synthesis and gelation character of photothermal responsive methylcoumarinotripeptidospiropyran","authors":"Guang Tian, Chuanguang Qin","doi":"10.1166/mex.2023.2522","DOIUrl":"https://doi.org/10.1166/mex.2023.2522","url":null,"abstract":"Hydrogel of methylcoumarino-tripeptidospiropyran (MC-TPSP) with a conformational transition at the C-terminus of the peptide was synthesised in this study. This LMWG can be shifted between gel and solution due to the isomerization of spiropyran- and merocyanine-typed MC-TPSP and MC-TPMC, respectively. UV was used to investigate the isomerisation process, and SEM was used to characterise the morphology of the MC-TPMC. The transition temperature was determined to be 75 °C, and the minimum gel concentration was 14.5 mM. On account of its structural biocompatibility and responsive regulatory mechanism, it is anticipated that it will develop into an outstanding bio-functional material.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323172","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 limestone powder on properties of self-leveling mortar","authors":"Hao Xu, Fei-Jin Chen, Hong-Yu Tao, Yi-Feng He, Wen-Qiang Zhai, Jian-Ping Zhang, Zhi-Hai He","doi":"10.1166/mex.2023.2523","DOIUrl":"https://doi.org/10.1166/mex.2023.2523","url":null,"abstract":"Mixing limestone powder (LP) in the self-leveling mortar (SLM) can not only solve the problems of LP waste randomly piled up and secondary utilization of resources, but also reduce the raw material cost of SLM and have excellent mechanical properties. The effect of replacing fly ash (FA) with LP and replacing cement with LP after completely replacing FA on fluidity and strength of SLM are studied. The microstructure of SLM is measured by mercury intrusion porosimetry and scanning electron microscope. The results show that the initial fluidity and the 20-min fluidity of SLM decrease gradually with the increase of LP content. The strength of SLM increases and then decreases with the increase of LP replacing FA, and the strength is the highest when the addition of LP is 40%. When LP replaces cement after completely replacing FA, the strength of SLM decreases with the increase of displacement. Excessive LP can greatly damage the mechanical properties of SLM. The appropriate content of LP can improve the microstructure of SLM and promote the formation of hydration products, which is helpful to reduce the porosity and thus improves the structure density. This may be due to the chemical reaction and the microfiller effect of LP.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135324308","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":"Efficacy of laparoscopic pectopexy versus laparoscopic sacrocolpopexy and antibacterial performance of nanosilver-coated urethral catheter for postoperative catheterization in patients with pelvic organ prolapse","authors":"Chunyan Hu, Weiqiang Wang, Haoxi Yuan, Juan Li, Zuliang Liu, Ying Cao","doi":"10.1166/mex.2023.2515","DOIUrl":"https://doi.org/10.1166/mex.2023.2515","url":null,"abstract":"This study aimed to compare the clinical efficacy of laparoscopic sacrocolpopexy (LSC) and laparoscopic pectopexy (LP) for the treatment of pelvic organ prolapse (POP) and to evaluate the antibacterial effect of nanosilver-coated urethral catheters. The clinical data of 112 patients with POP, including 56 patients who underwent LP and 56 patients who underwent LSC, from March 1, 2019 to March 31, 2021 were retrospectively evaluated. All patients underwent routine catheterization with nanosilver-coated urethral catheters after surgery. The baseline data, intraoperative and postoperative efficacy, serum inflammatory indexes and postoperative complications were compared. The surgery was successfully completed in both groups, and a total of 10 patients in both group underwent intraoperative repair of the anterior and posterior vaginal walls. The surgical duration was significantly shorter and the intraoperative blood loss was significantly lower in the LP group than in the LSC group ( P <0.05 for both). In both groups, the POP quantification stage, which was ≥I prior to surgery, was ≤I at six months after surgery. The PFIQ-7, PFDI-20 and PISQ-12 scores were significantly improved in both groups ( P <0.05 for all), and the improvements were significantly better in the LP group than in the LSC group ( P <0.01). During the 6-month follow-up period, no patient developed urinary tract infection. The levels of postoperative serum inflammatory factors WBC, ESR and CRP were increased in the LSC group and higher than those in the LP group, highlighting the significant anti-infection effect of the nanosilver-coated catheter. Mesh exposure occurred in one patient in the LSC group. In the LSC group, postoperative symptoms including abnormal defecation, lower abdominal pain/soreness, new stress urinary incontinence, and dyspareunia. In the LP group, abnormal defecation and lower abdominal pain were present in one patient each. The rate of postoperative complications was higher in the LSC group than in the LP group. While both LSC and LP could restore pelvic floor anatomic structure and organ function in patients with POP, shorter surgical duration, less blood loss, and better therapeutic effect were observed in patients undergoing LP. Nanosilver-coated antibacterial catheters exhibited good antibacterial effect in patients with routine catheterization after surgery. This study provides a new treatment plan for the treatment of pelvic organ prolapse, and also provides a new nursing method for postoperative urinary tract infection.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135324554","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":"Development of an improved ELISA method based on gold nanoparticles to evaluate the correlation of serum occludin and zonula occludin-1 (ZO-1) levels with cognitive impairment in elderly patients with acute cerebral infarction","authors":"Li Gao, Jianjun Zhang, Jianhui Wei, Jiangang Li","doi":"10.1166/mex.2023.2512","DOIUrl":"https://doi.org/10.1166/mex.2023.2512","url":null,"abstract":"The present study evaluated an improved Enzyme linked immunosorbent assay (ELISA) method based on gold nanoparticles by investigating the correlations of measured serum occludin and zonula occludin-1 (ZO-1) levels with cognitive impairment in elderly patients with acute cerebral infarction (ACI). The present study comprised a total of 98 patients with ACI that were divided into patients with normal cognitive function (normal group) and patients with cognitive impairment (PSCI group) according to mini-mental state examination (MMSE) scores. Serum levels of triglycerides, total cholesterol, and low-density lipoprotein were measured using an automatic biochemical analyzer. Serum occludin and ZO-1 levels in both groups were measured using a modified ELISA assay with nanogold particles. Neurological function in elderly patients with ACI was assessed using the National Institutes of Health Stroke Scale (NIHSS) score. Pearson’s correlation coefficient was calculated for the correlations between serum occludin levels, serum ZO-1 levels, and cognitive impairment in elderly patients with ACI. Receiver operating characteristics (ROC) curves were used to analyze the diagnostic value of serum occludin and ZO-1 levels in detecting cognitive impairment in elderly patients with ACI. Logistic regression analysis was used to identify factors associated with cognitive impairment in elderly patients with ACI. In the PSCI group, a significantly higher proportion of patients had hypertension, coronary heart disease, and diabetes compared to the normal group. Serum occludin and ZO-1 levels were significantly lower in the PSCI group compared to the normal group ( P <0.05). Serum occludin and ZO-1 levels in elderly patients with ACI were negatively associated with NIHSS score ( P <0.05). Receiver operating characteristic analysis demonstrated that the area under the curve (AUC) of serum occludin and ZO-1 in detecting cognitive impairment in elderly patients with ACI was 0.926 and 0.824 respectively, with a combined AUC of 0.945 indicating a synergistic effect in detecting cognitive impairment. Logistic regression analysis showed that hypertension, diabetes, coronary heart disease, and lower serum occludin, and ZO-1 levels were all independent risk factors for cognitive impairment in elderly patients with ACI. Lower serum levels of occludin and ZO-1 level had diagnostic value in detecting cognitive impairment in elderly patients with ACI and may have utility as an auxiliary diagnostic index for cognitive dysfunction in patients with ACI.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323176","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}