Journal of Metastable and Nanocrystalline Materials最新文献_第3页

Effect of Ternary Element Addition on Properties of TiNi-Based Shape Memory Alloys for Engineering and Medical Applications 三元元素添加对tini基形状记忆合金性能的影响

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-70e83b

M. Ahmad

引用次数: 0

Optimization of Ultrasonication Time and Amplitude to Obtain Microbial Nanocellulose with High Degree of Crystallinity 超声时间和振幅优化制备高结晶度微生物纳米纤维素

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-x7sc0g

Lesybeth M. Nubatonis, L. Hartoto, E. Warsiki, Khaswar Syamsu

{"title":"Optimization of Ultrasonication Time and Amplitude to Obtain Microbial Nanocellulose with High Degree of Crystallinity","authors":"Lesybeth M. Nubatonis, L. Hartoto, E. Warsiki, Khaswar Syamsu","doi":"10.4028/p-x7sc0g","DOIUrl":"https://doi.org/10.4028/p-x7sc0g","url":null,"abstract":"The production of microbial nanocellulose implicates physical and mechanical methods such as the application of ultrafine grinders and ultrasonicators. Nano-sized microbial cellulose must contain high crystallinity to be utilized as a filler in nanocomposite polymers. This research aimed to optimize the processing time and amplitudes of the ultrasonication process to stimulate nano-sized microbial cellulose with high crystallinity. In this analysis the Surface Responses Method was used, that is Central Composite Design (CCD) with two factors, that is processing time (X1 = 30, 60, and 90 minutes) and ultrasonication amplitude (X2 = 70, 80, and 90 %) to the degree of crystallinity. The results indicated the optimum point was obtained at a combination of 60 minutes of processing time and 80% amplitudes with the highest degree of crystallinity of 76.23%. The Fourier Transform Infra-Red spectrum at wavenumbers 3340 cm-1 to 2899 cm-1 showed the characteristics of absorption bands in the form of carboxyl groups and hydroxyl groups, which indicate the existence of cellulose compounds. The scanning electron microscope showed the surface morphology of the ultrafine grinding microbial cellulose fibers was denser.","PeriodicalId":177608,"journal":{"name":"Journal of Metastable and Nanocrystalline Materials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132020771","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

Enhancement of Intensity of Emission and Photoluminescence Properties of Red Light Emitting YPO4:Eu3+ by Infiltration of Li+ in the Crystal Structure of YPO4:Eu3+ Li+在YPO4:Eu3+晶体结构中渗透增强YPO4:Eu3+红光发射强度和光致发光性能

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-7k6up3

D. Pyngrope, A. Prasad, R. Pradhan

引用次数: 0

Structural and Photoluminescence Properties of Pr, Cu Co-Doped ZnO Nanoparticles Synthesized by Chemical Co-Precipitation Method 化学共沉淀法合成Pr、Cu共掺杂ZnO纳米粒子的结构和光致发光性能

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-325t7s

Sonti Venkata Ramana, C.V. Krishna Reddy, G. Harish, C. Salma, M. Rao

引用次数: 0

Effect of Capping Agent on the Shape and Catalytic Activity of PtPd Bimetallic Alloy Nanostructures 封盖剂对PtPd双金属合金纳米结构形状和催化活性的影响

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-6t2hg0

M. Johan Ooi, Nurshahzleen Mohd Yusaini, A. Mahmood, N. Napiah, Y. Yusof

引用次数: 0

Molecular Dynamics Simulation of Shock Wave Propagation in Aluminum Single Crystal 铝单晶中激波传播的分子动力学模拟

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-18w2oa

Yuanyuan Ju, Lei Zhang

引用次数: 1

Removal of Congo Red Dye Using Green Kyllinga Weed Extract and Silver Nanoparticles as Catalysts 绿麒麟草提取物和纳米银催化剂对刚果红染料的去除

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-x6c7nw

N. Isa, S. H. Khalid, Aishah Nur Addia Azizan, N. Wahab, Mohamed Syazwan Osman, Vicinisvarri Inderan

引用次数: 0

Photoluminescence Studies of Europium Doped Di-Strontium Magnesium Silicate Phosphors 掺铕硅酸二锶镁荧光粉的光致发光研究

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-05-09 DOI: 10.4028/p-x05t8g

R. Shrivastava

{"title":"Photoluminescence Studies of Europium Doped Di-Strontium Magnesium Silicate Phosphors","authors":"R. Shrivastava","doi":"10.4028/p-x05t8g","DOIUrl":"https://doi.org/10.4028/p-x05t8g","url":null,"abstract":"This article reports the study of photoluminescence spectra of Di Strontium Magnesium Silicate (Sr2MgSi2O7) doped with various concentration of Europium (Eu3+) prepared using solid-state reaction technique. The doping concentration (s) of Eu3+ were 0.2, 0.5, 1.0, 1.5, 2.0, 2.5 mol% respectively. Excitation spectrum monitored at 620 nm wavelength that exhibited two prominent peaks centered at 256 nm and 277 nm. Peak observed at 277 nm was more intense therefore the emission spectra were monitored at 277. Emission Spectra of all the samples revealed intense peaks centred at 607, 618 and 637 are attributed to 5D0 7F2 of Europium (III) ions accommodated at various lattice sites having different energies. Overall emission was found in the red colour region which was confirmed using a CIE chromaticity diagram with coordinate (0.4805, 0.3763). Critical distance for energy transfer in the concentration, beyond which concentration quenching occurred in PL spectra, was calculated. In this case, the critical distance was found to be 19.87 Å, therefore the mechanism involved in concentration quenching of Sr2MgSi2O7 doped with 2.0 mol % of Europium (III) must be only multipole-multipole exchange whereas the exchange interaction is ineffective.","PeriodicalId":177608,"journal":{"name":"Journal of Metastable and Nanocrystalline Materials","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130194681","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

Comparative X-Ray Diffraction (XRD) Study on the Synthesis of Natural Based Magnetic Silica Nanoparticles 天然磁性二氧化硅纳米颗粒合成的对比x射线衍射(XRD)研究

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-02-10 DOI: 10.4028/p-6d8vlt

Muhammad Yovinanda Maulana, B. Yuliarto, S. N. A. Jenie, N. L. W. Septiani

{"title":"Comparative X-Ray Diffraction (XRD) Study on the Synthesis of Natural Based Magnetic Silica Nanoparticles","authors":"Muhammad Yovinanda Maulana, B. Yuliarto, S. N. A. Jenie, N. L. W. Septiani","doi":"10.4028/p-6d8vlt","DOIUrl":"https://doi.org/10.4028/p-6d8vlt","url":null,"abstract":"The aim of this study was to compare the synthesis process of magnetic silica nanoparticles (Fe-SNP) through the analysis of X-ray Diffraction (XRD) results. Fe3O4 magnetic nanopowders was synthesized by ultrasonic assisted co-precipitation and Fe-SNP was synthesized by direct mixing method of sodium silicate (Na2SiO3) and magnetite (Fe3O4) and the sol-gel method. Silica sludge was used as a silica source from Indonesia geothermal power plant waste. The synthesized of Fe-SNP is the functionalization of Fe3O4 with silica. Variations concentration of Na2SiO3 is used for the direct mixing method and variations of Fe3O4 form is used for the sol-gel method. Particles formed and particle size were characterized by XRD. The XRD results showed that there is no SiO2 phase in the sample synthesized by direct mixing method while two phases of SiO2 and Fe3O4 were found in the sample synthesized by sol-gel method. The size of the Fe3O4 nanoparticles calculated with Scherer’s formula and it obtained 19.9 nm, while the Fe3O4 nanoparticles with the addition of 20 mL and 6 mL Na2SiO3 concentrations were 6,53 nm and 10,23 nm. For the sol-gel method the size of Fe3O4 nanoparticles obtained was 11,03 using Fe3O4 powders and 9,86 using Fe3O4 solutions.","PeriodicalId":177608,"journal":{"name":"Journal of Metastable and Nanocrystalline Materials","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129917183","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

Biosynthesis of Silver Nano/Micro-Particles Using Sambiloto (Andrographis paniculata) Leaves Extract: Effect of AgNO3 Solution Concentrations 山茱萸叶提取物生物合成纳米/微银:AgNO3溶液浓度的影响

Journal of Metastable and Nanocrystalline Materials Pub Date : 2023-02-10 DOI: 10.4028/p-70kcr5

A. Chafidz, Pratikno Hidayat, Sabda Maulana, Eric H. Ramadhan, H. Prasetiawan, M. Kaavessina, N. Hendrawati

{"title":"Biosynthesis of Silver Nano/Micro-Particles Using Sambiloto (Andrographis paniculata) Leaves Extract: Effect of AgNO3 Solution Concentrations","authors":"A. Chafidz, Pratikno Hidayat, Sabda Maulana, Eric H. Ramadhan, H. Prasetiawan, M. Kaavessina, N. Hendrawati","doi":"10.4028/p-70kcr5","DOIUrl":"https://doi.org/10.4028/p-70kcr5","url":null,"abstract":"Silver nano/micro particles have been successfully produced via biosynthesis using sambiloto (Andrographis paniculata) leaves extract as the reductor agent. The obejctive of current was to study the effect of four different AgNO3 solution concentrations (i.e. 0.0125, 0.025, 0.05, 0.075 M) on the production of silver nano/micro particles via biosynthtesis. The sambiloto extract concentration used in this study was 0.5% w/v. The silver nano/micro particles produced via biosynthesis was characterized using UV-Vis spectrophotometer and Scanning Electron Microscopy (SEM). The UV-Vis analysis results showed that absorbance peaks for all four samples were observed at wavelength around 450 nm, which can be attributed to the presence silver nano/microparticles. The absorbance peak values for all samples were 0.1115; 0.0876; 0.052; 0.0424 for AgNO3 solution concentration of 0.0125; 0.025; 0.05; 0.075 M, respectively. The UV-Vis analysis results could also qualitatively conclude that the size of silver nano/micro particles produced at lower AgNO3 solution concentration were smaller than the size of silver nano/micro particles produced at higher AgNO3 solution concentration. In the other hand, SEM image showed that the size of silver particles prepared using AgNO3 solution concentration of 0.075 M was in the range of 5 – 10 μm, hence it can be called silver micro-particles. It was assumed that the size of silver nano/micro particles produced at higher AgNO3 solution concentration were bigger than the size of silver nano/micro particles produced at lower AgNO3 solution concentration.","PeriodicalId":177608,"journal":{"name":"Journal of Metastable and Nanocrystalline Materials","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126507180","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