Materials Express最新文献

{"title":"Preparation of iron nanoparticles mediated by Punica granatum and its application for the treatment of denture stomatitis","authors":"Yue Yuan, Haizhang Mou, Yan Dong, Han Qi","doi":"10.1166/mex.2024.2713","DOIUrl":"https://doi.org/10.1166/mex.2024.2713","url":null,"abstract":"Denture stomatitis affects around 50% of denture wearers in certain populations as a prevalent oral mucosal lesion. There has been a high interest in utilizing natural antibacterial composites, such as medicinal plants extracts. Punica granatum, a popular medicinal plant, has\u0000 various pharmacological applications. In this particular research, iron NPs were formulated by the Punica granatum aqueous extract, following the principles of green chemistry. The study objective was to assess the effectiveness of FeNPs on denture stomatitis. The usual analytical examinations\u0000 were applied for FeNPs. The FE-SEM results confirmed that the nanoparticles exhibited a spherical morphology, with sizes ranging from 21.6 to 65.8 nm. This clinical trial involved 30 patients who received FeNPs. Over a period of two weeks, the patients were instructed to consume the mouthwash\u0000 four times per day, with 15–20 drops each time, for a duration of 2–3 minutes. Following the mouthwash, they were advised to refrain from eating or drinking for 0.5 hour. The patients in both classes were instructed to consume the medication at particular times. The erythema and\u0000 inflammation levels were recorded and assessed at each session using a 6-point scale and a graded blade. Additionally, palatal mucosa mycological samples were collected for culture during each visit. The data revealed a notable reduction in the palatal erythema surface compared to the initial\u0000 condition in the follow-up visits. This study suggests that FeNPs can effectively reduce the Candida colonies number and the area affected by erythema in the denture stomatitis management.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141699599","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":"Tension anisotropy of rolled AA7075-T6 auminium alloy: Experiments, BP-Neural network modeling and orientation dependent failure mechanisms","authors":"L. Lv, Wei William Lee, Hui Lin, Tao Jin","doi":"10.1166/mex.2024.2716","DOIUrl":"https://doi.org/10.1166/mex.2024.2716","url":null,"abstract":"This paper presents the investigations on anisotropic tension mechanical responses of AA7075-T6 based on experiments, classical strength theory, BP-neural network modeling and fracture morphology characterization. Results show that the tension strength anisotropy weakens with deformation\u0000 degree. Compared to the traditional method, the machine learning model exhibits more flexible in solving the anisotropic plastic responses of AA7075-T6 auminium alloy sheet and provides more accurate predictions. Through analyzing the fracture surface of tension specimen at various orientations,\u0000 the failure mechanism is sensitive to orientation. Specifically, the irregular distribution of dimples zones and cleavage steps can be observed at lower material orientation. As the orientation increases, the alternative occurrence of ductile and brittle features dominates the failure mechanism.\u0000 The medium-size dimple caused by coalescence of small-size dimples represents a transition between ductile features zone and brittle characteristics region.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141702355","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":"Preparation, drug loading and antibacterial properties of zinc-iron-based nanomaterials","authors":"Wenwen Cheng, Jin Zhang, Na Lin, Ding Yuan, Shuai Zhang, Zhonggang Yang, Tianyi Cao","doi":"10.1166/mex.2024.2565","DOIUrl":"https://doi.org/10.1166/mex.2024.2565","url":null,"abstract":"Objective: To explore the preparation of a nano-scale zinc-iron-based material, and discuss the antibacterial and drug-loading properties of the nano-material. Methods: (1) Preparation and analysis of nanomaterials: On the basis of the preparation of Prussian substance,\u0000 magnetic zinc-iron nanomaterials were prepared using this substance as a precursor. The shape and topography of the zinc-iron-based materials are analyzed by transmission electron microscope equipment and scanning electron microscope equipment, and their composition is analyzed by X-ray method.\u0000 (2) Analysis of drug-loading properties of nanomaterials: Tetracycline and capsaicin were used as drug-loading analysis models to study the adsorption and release effects of materials on the two carriers. (3) Toxicity test analysis: The thiazolium blue colorimetric method was used to analyze\u0000 the influence relationship between the drug-loaded particles loaded with capsaicin and HepG-2 cells, and the influence results were analyzed. (4) Antibacterial performance analysis: study the drug-loaded particles loaded with tetracycline and observe the inhibitory effect of the carrier on\u0000 the growth of the strain. Results: The Zn3[Fe(CN)6]2 xH2O sample material was prepared from K3Fe(CN)6 and ZnCl2, and the self-made sample was detected by the X-ray analyzer. The sample conformed to the\u0000 high-purity Zn3[Fe(CN)6]2 ·xH2O standard. And the self-made Zn3[Fe(CN)6]2 ·xH2O was analyzed for drug loading, and the release of capsaicin can reach 86.3% under a certain phosphate\u0000 buffer solution. At the same time, Zn3[Fe(CN)6]2 · xH2O supports tetracycline, and the maximum release rate can reach 90% in phosphate buffer. The self-made Zn3[Fe(CN)6]2 ·xH2O\u0000 samples and ZnFe2O4/ZnO were tested for antibacterial properties, and the Zn3[Fe(CN)6]2 · xH2O samples were loaded with after capsaicin has a significant inhibitory effect on cancer cells, the inhibitory effect\u0000 is more obvious than other groups. At the same time, tetracycline was loaded on ZnFe2O4/ZnO for antibacterial experiments, and the inhibitory effect of the drug loading on the bacteria was more obvious. Conclusion: Zinc-iron-based nanomaterials can be successfully\u0000 prepared by K3Fe(CN)6 and ZnCl2 raw materials. During the preparation, it is necessary to control the time and the concentration of preparation agents reasonably to ensure the quality of the samples. The two samples prepared have good effect adsorption in terms\u0000 of drug loading, and the application of specific drug models at the same time has better performance in antibacterial effect. The research content provides corresponding technical references for the application of material technology in the medical field.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141700970","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":"The value of N-acetylcysteine bronchoalveolar lavage in patients with severe traumatic brain injury combined with ventilator-associated pneumonia","authors":"Yujuan Li, Jing Lu","doi":"10.1166/mex.2024.2654","DOIUrl":"https://doi.org/10.1166/mex.2024.2654","url":null,"abstract":"In order to improve the treatment of patients with ventilator-associated pneumonia (VAP) in severe traumatic brain injury (TBI) and to effectively suppress the inflammatory response and enhance blood oxygen indicators, we conducted an innovative bronchoalveolar lavage (BAL) treatment\u0000 using N-acetylcysteine (NAC). To conduct this study, we divided patients with VAP in severe TBI into a control (CTRL) group and a BAL group. The control group received BAL with saline, while the BAL group received BAL with NAC in addition to standard care. We compared the clinical treatment,\u0000 degree of inflammation, blood oxygen index, and safety of both groups pre- and post-BAL. The results showed that BAL with NAC was more effective in reducing the duration of antibiotic use, imaging uptake, fever reduction, mechanical ventilation, and ICU stay, as well as CPIS and APACHE II\u0000 scores. Moreover, the BAL group demonstrated greater improvement in ventilation, as indicated by increased values of PaO2, SaO2, and OI, and a more substantial decrease in PaCO2. Furthermore, BAL treatment effectively suppressed the level of inflammatory response\u0000 in the body and more significantly reduced TNF-α, CPR, PCT and MIP-1α levels. Adjuvant treatment with BAL effectively improved clinical outcomes and reduced mortality in severe TBI patients with VAP, while maintaining a high level of safety during the BAL operation.\u0000 Therefore, BAL using NAC holds significant potential in the salvage of patients with severe TBI combined with VAP.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141704709","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 Si substrate conductivity on surface acoustic wave resonator","authors":"Dahao Wu, Y. Shuai, Zijie Wei, Wei Fan, Peiran Li, Xinqiang Pan, W. Luo, Chuangui Wu, W. Zhang","doi":"10.1166/mex.2024.2720","DOIUrl":"https://doi.org/10.1166/mex.2024.2720","url":null,"abstract":"A surface acoustic wave (SAW) filter’s bandwidth and quality are determined by its resonators’ electromechanical coupling coefficient (k2) and impedance ratio (IR). Research commonly focuses on the effects of piezoelectric material and cutting direction\u0000 on these parameters. This paper investigates the effect of the conductivity of the Si substrate on k2 and IR through finite element method (FEM) simulations. A new model based on the modified Butterworth-van-Dyke (MBVD) model is presented. This new model takes into account\u0000 the substrate parasitic capacitance and resistance to predict resonator performance on low resistivity (LR) Si piezoelectric on insulator (POI) substrates. Both high resistivity (HR) Si and LR-Si are utilized to fabricate POI SAW resonators, which are subsequently tested. The high conductivity\u0000 of the Si support layer leads to a decrease in both k2 and IR. By employing Si substrates with different resistances during fabrication, it becomes possible to manufacture resonators with varying k2 values, thus meeting diverse bandwidth requirements for\u0000 filters.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141690482","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 the shape-memory alloy ring hugger and microplate in proximal clavicle fractures","authors":"Linliang Wang, Lili Ma, Liang Li, Liping Xu","doi":"10.1166/mex.2024.2705","DOIUrl":"https://doi.org/10.1166/mex.2024.2705","url":null,"abstract":"The efficacy and safety of shape-memory alloy (SMA) ring hugger and microplate in the treatment of proximal clavicle fractures were compared to better improve the quality of patient rehabilitation and minimize complications. The mechanical properties of Ni-Ti alloy and Ti64Al4V (compressive\u0000 strength and elastic modulus) were examined in the physicochemical property tests, while, mouse osteoblasts were cultured to test their biocompatibility. Subsequently, clinical data of patients with clavicle fractures treated at our hospital from January 2012 to January 2022 were retrospectively\u0000 analyzed. The patients were divided into microplate and SMA groups based on the surgical methods, and the follow-up period was 1 year post-surgery. Clinical treatment, mobility and functional recovery (DASH score and Constant score) of the affected upper limb, numbness, and adverse effects\u0000 were compared between the two groups. SMA exhibited a compressive strength similar to that of Ti6Al4V, but its modulus of elasticity was significantly lower. Meanwhile, the results of the cellular experiments suggested that the addition of SMA and Ti6Al4V would not markedly decrease the osteoblast\u0000 activity, suggesting that both internal fixation implants had good biocompatibility. In addition, SMA ring hugger was effective in reducing operative time, intraoperative bleeding, wound size, fracture end healing time, and residual fracture shortening. In terms of postoperative assessment\u0000 of affected limb mobility, SMA ring hugger better improved the mobility of the affected shoulder in supination, abduction, adduction, and forward flexion, and was more effective in decreasing the DASH score and increasing the Constant score. Meanwhile, SMA ring hugger effectively reduced numbness\u0000 in the affected area and decreased the incidence of delayed wound healing, exercise restrictions, proliferative scars, and vegetative stimulus. Therefore, SMA ring hugger demonstrates favorable mechanical performance and biocompatibility, meanwhile, it can better promote postoperative functional\u0000 recovery of the affected limb in clavicle fracture patients with guaranteed safety.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141700154","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":"Antibacterial behavior and mechanism of nitrogen, silicon-doped amphiphilic carbon dots","authors":"B. Xue, Jing Liu, Ji-Qiang Guo, Li Zhang, Mei-Wen An, Jin Zhang","doi":"10.1166/mex.2024.2518","DOIUrl":"https://doi.org/10.1166/mex.2024.2518","url":null,"abstract":"A new kind of amphiphilic carbon dots (CDs) was prepared with citric acid and silane coupling agent as raw materials. Due to the doping of nitrogen and silicon elements, the surface of CDs contains not only oxygen-containing functional groups, but also alkyl hydrophobic chains, showing\u0000 amphiphilic characteristic. The micro molecular structure and elemental composition of CDs were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), and other tests. The antibacterial behavior of CDs against Escherichia coli (E. coli) and Staphylococcus\u0000 aureus (S. aureus) was studied by the disk antibacterial method, plate colony, scanning electron microscopy (SEM) and other methods. The biocompatibility of CDs was evaluated by cytotoxicity and hemolysis in vitro. The results proved that CDs possessed the average particle\u0000 size of 1.75 nm and the negative surface potential of −2.71 mV. For E. coli and S. aureus, the minimum bactericidal concentrations of CDs were 500 μg/mL and 400 μg/mL, respectively. These co-doped CDs also possessed the ability to inhibit biofilm formation.\u0000 The antibacterial mechanism was mainly through the adsorption force to rupture the bacterial membrane and induce the generation of reactive oxygen species in bacterial cells. In addition, CDs exhibited excellent biocompatibility because of their low cytotoxicity and hemolysis, indicating that\u0000 they can be used as a new material in the antibacterial field.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141706018","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":"Salvia fruticosa mill leaves: chemical assessment and antimicrobial activity of different extracts based on molecular docking study","authors":"K. Abdelshafeek, Abbas B. Rahmatall, Aisha H. Muftah, Chahra Amairia, Suliman A. Alderhami, Abdallah Ibnsharrada, Ahmed A. Elhenawy","doi":"10.1166/mex.2024.2719","DOIUrl":"https://doi.org/10.1166/mex.2024.2719","url":null,"abstract":"The primary objective of this study is to identify and analyze the lipid and flavonoid components present in Salvia fruticosa Mill, as well as to assess its potential antibacterial activity. Introduction: Salvia fruticosa Mill (SF) is considered a significant medicinal\u0000 plant that is found all over the world. Method: The essential lipid contents (fatty acids and unsaponifiable matter), the volatile oil from leaves, and the antibacterial activity of various extracts were all evaluated. The lipid components were extracted with n-hexane then fractionated.\u0000 Four flavonoids, namely luteolin, cosmos, cynaroside, andorientin, were isolated from the alcoholic extract of the plant by chromatographic and spectroscopic methods. The extracts were tested for their antimicrobial activity against various microorganisms by measuring the inhibition zone diameter\u0000 using disc diffusion method. A molecular docking study was performed to assess the binding affinity of the flavonoids to the DNA gyrase enzyme, which is a crucial target for antibacterial drugs. Caryophyllene (18.70%), lab-13-ene,8,15-diol (15.93%), methyl linoleate (10.53%), and 1,8-cineole\u0000 (8.24%) are the most prevalent components in the volatile oil, according to the GC/MS analysis. The lipid components were fractionated into three groups: the unsaponifiable fraction, the fatty acid OMe (FAME), and the insoluble fraction of the acetone (fatty alcohols and hydrocarbons). The\u0000 obtained results show remarkable antifungal activity with chloroform extract against A. flavus and moderate activity against A. niger. Besides, the butanol and ethyl acetate extracts presented high activity against Sarcina sp. with inhibition zone of 22 mm. The microorganism\u0000 B. cerus was affected moderately by ethyl acetate and chloroform extracts with inhibition zone of 14 and 12 mm, respectively. The methanol extract was active against C. albicans only. The fatty acids fraction inhibited the growth of A. flavus with inhibition zones of 8,\u0000 10 and 14 mm for different concentrations, respectively. The Docking results revealed that all compounds exhibited a promising interaction into the DNA-gyrase, which agrees with an experimental data got from the antibacterial activity assay. These results were obtained first for this plant,\u0000 especially the results of molecular docking study in relation to antibacterial activity.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141691344","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":"Smoothing effects of two-dimensional materials","authors":"Xiaodong Wang, Hanlin Wang, Jiahao Peng, Jun Zhou, Chen Tao, Xin Zheng, Shuai Ren, Peng Zhou, Bo Chen","doi":"10.1166/mex.2024.2695","DOIUrl":"https://doi.org/10.1166/mex.2024.2695","url":null,"abstract":"Rippling in graphene, which is an out-of-plane corrugation induced by thermal fluctuations, plays a fundamental role in supporting the material’s stable existence. These ripples have also been instrumental in explaining various unconventional electronic and chemical properties\u0000 of graphene. Previous experimental findings have indicated that graphene exhibits smoothing effects on underlying substrates in the high-spatial-frequency regime. To explain this phenomenon, we employed a force balance model that considered both van der Waals forces and strain forces. By utilizing\u0000 traditional film-growth theory, our model successfully predicted experimental results.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141712053","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":"Ultralight reduced graphene oxide based foam with excellent electromagnetic interference shielding and superior mechanical properties","authors":"He-Ping Zheng, Ji-Lin Pan, Jian-Hua Tang, Jia-Hong Niu, Hao Lin, Ling Xu","doi":"10.1166/mex.2024.2714","DOIUrl":"https://doi.org/10.1166/mex.2024.2714","url":null,"abstract":"Reduced graphene oxide/carboxymethyl cellulose (RGO/CMC) foams with ultra-lightweight, excellent EMI shielding and mechanical robustness are fabricated based on a facile solution method and regulation of thermal reduction conditions. Results indicate that the two-step heating mode is\u0000 good to obtain better EMI shielding properties. By introducing only 10 wt% of CMC, high electrical conductivity up to 34.7 S/m and EMI shieling effectiveness (SE) up to 34.6 dB are obtained. In addition, due to the connection effect of CMC, superior compressive strength and modulus as high\u0000 as 8.3 KPa and 29.2 KPa are achieved, corresponding to an increase of 388.2% and 378.7%, respectively, compared to that of the RGO foam without CMC. Moreover, due to the ultralow density (∼4.1 mg/cm3) and high EMI SE of RGO/CMC, excellent specific shielding efficiency as high\u0000 as 42195 dB.cm2/g is obtained, way much superior to that of other metal-, graphene-, and CNT-based carbon foams. This work will have great significance for facile fabricating efficient EMI shielding materials towards electronics and aerospace applications.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141714559","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}