Journal of Boron最新文献_第7页

Enhancing the mechanical features of poly(vinyl) alcohol nanofibers with the addition of boron nitride 氮化硼的加入增强了聚乙烯醇纳米纤维的力学性能

Journal of Boron Pub Date : 2020-11-17 DOI: 10.30728/boron.696373

Hazal Gergeroglu, Neslihan Sakar, H. Ghorbanpoor, Cagla Ozer

引用次数: 0

Kolemanit, tinkal, üleksit ve bor atığında atomik absorpsiyon spektroskopi yöntemi ile Fe, Ni, Co ve Zn eser elementlerinin tayini

Journal of Boron Pub Date : 2020-11-11 DOI: 10.30728/boron.756254

A. Türker, Or.Sabri Acar

引用次数: 0

Box–Behnken Experimental Design for Zinc Borate Zn2B6O11•7H2O 硼酸锌Zn2B6O11•7H2O的Box-Behnken实验设计

Journal of Boron Pub Date : 2020-09-27 DOI: 10.30728/BORON.698858

S. Polat, P. Sayan

{"title":"Box–Behnken Experimental Design for Zinc Borate Zn2B6O11•7H2O","authors":"S. Polat, P. Sayan","doi":"10.30728/BORON.698858","DOIUrl":"https://doi.org/10.30728/BORON.698858","url":null,"abstract":"The present study investigated the effect of the operating conditions on the crystallization of zinc borate. For zinc borate crystallization, sodium tetraborate decahydrate and zinc sulfate heptahydrate were used as reactants. In the first part of the study, the crystals were characterized by X-ray diffraction spectroscopy (XRD), Fourier-transform infrared spectroscopy (FTIR), light microscopy, and particle size and thermogravimetric analysis. The results show that the obtained crystals were in the form of Zn2B6O11•7H2O, and the operating conditions had a significant effect on the size, morphology, and filtration characteristics of the zinc borate crystals. In the second part of the study, Box–Behnken design (BBD) with response surface methodology (RSM) was employed to determine the optimal operating conditions for zinc borate crystallization. The effects of stirring rate, temperature, and reactant feed rate on the average particle size were investigated. The results show that the data sufficiently fit the second-order polynomial model. The crystallization conditions, including stirring rate, temperature, and reactant feed rate, were studied at 400–500 rpm, 45–85oC, and 300–900 mL/h, respectively. The minimum particle size (3.3 µm) was obtained at a stirring rate of 450 rpm, a temperature of 85oC, and a reactant feed rate of 300 mL/h.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121602406","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: 3

Effect of Silanization Time on the Surface Modification of Anhydrous Borax 硅化时间对无水硼砂表面改性的影响

Journal of Boron Pub Date : 2020-09-17 DOI: 10.30728/BORON.690315

S. Akpınar, Zeyni Arsoy

引用次数: 1

Characterization of surface properties of dry-coated anhydrous borax powders 干包膜无水硼砂粉的表面性能表征

Journal of Boron Pub Date : 2020-09-10 DOI: 10.30728/boron.675261

S. Akpınar

{"title":"Characterization of surface properties of dry-coated anhydrous borax powders","authors":"S. Akpınar","doi":"10.30728/boron.675261","DOIUrl":"https://doi.org/10.30728/boron.675261","url":null,"abstract":"Dry particle coating of anhydrous borax (ANB) powders with hydrophobic stearic acid (SA) in the planetary ball mill was investigated. Two process parameters, the amounts of modifier agent and the processing periods, were selected to investigate their effects on solubility, wettability, dispersibility, and hydration properties of ANB powders. Each of the process parameters, i.e., SA amounts (0.5, 1, and 2 wt.%), and coating periods (30, 60, and 120 min), was set at three different levels. Structural changes in the dry-coated powders were characterised using X-ray diffraction (XRD) and photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), and Differential thermal and thermogravimetric analysis (DTA-TG). A discrete coating at an efficiency of 68% was acquired with SA amount of 1 wt.% at a coating period of 60 min, and, thus, resulted in a 31.4% decrease (from 40% to 8.6%) in water solubility of ANB. Moreover, this discrete SA coating made ANB more hydrophobic (99o) and prevented its further hydration. Furthermore, FT-IR and XPS results indicated that SA is coated over the surface of ANB via physical adsorption rather than chemical bonding. Thus, the effective dry coating could be applied to obtain surface-coated ANB, which offers controlled solubility in water-based suspensions.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130214730","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

Investigation of Radiation Attenuation Properties of Al-Cu Matrix Composites Reinforced by Different Amount of B4C Particles 不同B4C颗粒增强Al-Cu基复合材料辐射衰减性能研究

Journal of Boron Pub Date : 2020-08-29 DOI: 10.30728/boron.730354

U. Gökmen, Zübeyde Özkan, Leili Eslam Jamalgolzari, S. Ocak

{"title":"Investigation of Radiation Attenuation Properties of Al-Cu Matrix Composites Reinforced by Different Amount of B4C Particles","authors":"U. Gökmen, Zübeyde Özkan, Leili Eslam Jamalgolzari, S. Ocak","doi":"10.30728/boron.730354","DOIUrl":"https://doi.org/10.30728/boron.730354","url":null,"abstract":"In recent years, B 4 C particle reinforced Al matrix composite materials have been excessively used for gamma and neutron shielding regarding their neutron absorption and lightweight. In this paper, linear and mass attenuation coefficients using 80 keV, 356 keV, 137Cs (662 keV), 60Co (1173 keV,1332 keV) and 2000 keV(high energy) gamma energies for B 4 C (5-15 wt%) particle-reinforced Alumix 13 and Alumix 231 (which contains special alloy elements such as Cu and Mg) aluminum matrix composites were theoretically calculated with XCOM platform. Pair production, coherent scattering, photoelectric absorption and incoherent scattering processes besides the total attenuation coefficients for B4C (5-15 wt%) particle-reinforced Alumix 13 and Alumix 231 matrix composite materials were evaluated separately. On the other hand, half-value thickness (HVL) values and one-tenth thickness values (TVL) were also calculated to evaluate the radiation shielding effectiveness of this material excluding coherent scattering values that are frequently used in gamma ray transport theory as well as the total attenuation coefficients. Gamma attenuation curves for Al composite materials against 80 keV, 356 keV, 137Cs (662 keV), 60Co (1173 keV, 1332 keV) and 2000 keV (high energy) gamma energies were theoretically calculated and plotted for B 4 C (5-15 wt%) particle-reinforced Alumix 13 and Alumix 231 matrix composite materials. According to the obtained results for this material, radiation attenuation properties and the ability of shielding of materials were investigated. Therefore, this study is original from a variety of aspects, and its results may be used not only in nuclear technology but also in other technologies such as nano and space technology.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130514753","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: 1

INVESTIGATION OF MICROSTRUCTURE AND HARDNESS PROPERTIES OF AGED AA 7075 MATRIX B4C / SiC REINFORCED COMPOSITE-HYBRID MATERIALS 时效AA 7075基体B4C / SiC增强复合-杂化材料的显微组织和硬度性能研究

Journal of Boron Pub Date : 2020-06-28 DOI: 10.30728/boron.665080

Hakan Gökmeşe, Ufuk Taşci, B. Bostan

{"title":"INVESTIGATION OF MICROSTRUCTURE AND HARDNESS PROPERTIES OF AGED AA 7075 MATRIX B4C / SiC REINFORCED COMPOSITE-HYBRID MATERIALS","authors":"Hakan Gökmeşe, Ufuk Taşci, B. Bostan","doi":"10.30728/boron.665080","DOIUrl":"https://doi.org/10.30728/boron.665080","url":null,"abstract":"Aluminum hybrid composites are next-generation metal matrix composites having the potential for advanced and new engineering applications. Therefore, in the study, using the powder metallurgy method, microstructure and hardness properties of aluminum (AA7075) composite and hybrid materials were examined in the combination of different ceramic reinforcement phases (5-10-15% B 4 C and SiC). Pressed (700MPa) matrix/reinforcement powder mixtures were sintered for 1 hour at a temperature of 560 °C. After the sintering process, density measurements of the test samples were carried out. In order to determine the microstructure and hardness properties of the test samples, optical microscope, scanning electron microscope (SEM), and micro-hardness (HV0.1) measurements were made respectively. At the same time, micro-hardness values were examined by applying the solution-quenching to the test samples at 475 °C temperature for 2 hours and the aging heat treatment at 120 °C temperature for 24 hours. Compared to single ceramic phase composite materials, a decrease in density and hardness value occurred in 5% B 4 C-SiC reinforced aluminum hybrid composite materials. Furthermore, it was determined that the micro-hardness values of test samples increased after the aging heat treatment.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117202975","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: 1

The Effect of High Boron Additions on the Microstructure of Cast Steel 高硼添加量对铸钢组织的影响

Journal of Boron Pub Date : 2020-06-28 DOI: 10.30728/boron.715761

Ö. Murathan, K. Kocatepe, M. Erdoğan

{"title":"The Effect of High Boron Additions on the Microstructure of Cast Steel","authors":"Ö. Murathan, K. Kocatepe, M. Erdoğan","doi":"10.30728/boron.715761","DOIUrl":"https://doi.org/10.30728/boron.715761","url":null,"abstract":"This study summarizes research into the effect of high boron additions on the microstructure of cast steel under the certain carbon (0.42 C wt.%) and chromium (11.65 Cr wt.%) content. Varying amounts of boron between 0.48 - 4.75 wt.% was added into steel melt. The boron analysis of the alloys was conducted by wet chemical analysis. The microstructure of the specimens was characterized with optical microscope, Scanning Electron Microscope with Energy Dispersive X-Ray Analysis (SEM/EDX) and X-Ray Diffraction (X-RD). The experimental results showed that high boron steel was successfully produced by sand casting with high casting yield. The microstructure of boron alloyed high chromium cast steel consists of three dimensional networks of M 2 B borides surrounding the martensitic matrix in as cast condition. Under the certain carbon and chromium content, boron carbide volume fraction is directly depended on the boron additions. Due to the high amount of chromium and boron, carbides and borides were embedded in each other in all additions. In the specimens having less than 2.44 B wt.%, carbide/boride structure was fishbone type with dendritic distribution over the matrix whereas rod/needle like structure with randomly distribute was observed in specimens having 2.44 - 4.75 B wt.%. In all specimens containing boron, M 2 B and M 7 (C, B) 5 type carbides/boride peaks were detected by X-RD analysis.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"386 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131580270","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: 2

Ortorombik metaborik asit molekülünün moleküler yapısı ve elektronik özellikleri üzerindeki konformasyonel etkinin teorik olarak incelenmesi

Journal of Boron Pub Date : 2020-06-28 DOI: 10.30728/boron.666064

Güventürk Uğurlu

{"title":"Ortorombik metaborik asit molekülünün moleküler yapısı ve elektronik özellikleri üzerindeki konformasyonel etkinin teorik olarak incelenmesi","authors":"Güventürk Uğurlu","doi":"10.30728/boron.666064","DOIUrl":"https://doi.org/10.30728/boron.666064","url":null,"abstract":"Bu calismada, ortorombik metaborik asit molekulunun konformasyon analizi, dogrusal olmayan optik davranisi, titresim spektrumlari, elektronik ve molekuler yapisi ab initio Hartree Fock (HF) ve Yogunluk Fonksiyonel Teorisi DFT/B3LYP temel seviyesinde (6-311++G(d,p) temel seti kullanilarak kapsamli bir sekilde arastirildi. Konformasyon analizi hem φ (B1-O1-H) bag acisi, hem de ψ (O4-B1-O1-H) dihedral acisinin fonksiyonu olarak ilk kez detayli olarak yapildi. Hesaplanan potansiyel enerji egrilerinin sonuclari, molekulun minimum enerjili iki kararli konformere (C-I ve C-II konformer) sahip oldugunu gosterdi. C-I konformeri C-II konformerinden daha kararlidir. Ortorombik metaborik asit molekulunun C-I ve C-II konformerlerinin dogrusal ve dogrusal olmayan optik ozellikleri, elektrik dipol momenti μ, polarizebilite α ve hiperpolarizebilitesi β her iki yontem ile incelenmistir. Molekulun C-I ve C-II konformerlerinin optimize edilmis molekuler yapilari, sirasiyla, C3h ve Cs simetrisine sahiptir. Cs simetrisine sahip C-II konformeri icin B3LYP/6-311++G(d,p) ve HF/6-311++G(d,p) yontemleri kullanilarak elde edilen dipol momenti degerleri 2,95 ve 3,07 Debyedir. Oysa C3h simetrisine sahip C-I konformeri icin ayni yontemler kullanilarak elde edilen degerlerin esit oldugu (0,0 Debye) bulunmustur. Her iki konformerin titresim modlarinin isaretlenmesini bulmak icin toplam enerji dagilimi (TED) VEDA 4f programi kullanilarak hesaplanmistir. Literaturdeki deneysel veriler ile hesaplanan yapisal parametreler arasinda iyi bir uyum oldugu gorulmustur.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115672298","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

Synthesis and characterization of trimethoxy boroxine 三甲氧基硼氧辛的合成与表征

Journal of Boron Pub Date : 2019-09-30 DOI: 10.30728/boron.600813

Sedat Sürdem

引用次数: 2