Pub Date : 2018-03-14DOI: 10.1080/10426507.2018.1452229
Sk. Nayab Rasool, Ch. Subramanyam, D. B. Janakiramudu, P. Supraja, R. Usha, C. N. Raju
GRAPHICAL ABSTRACT ABSTRACT A series of new phosphoramidates and phosphonates were synthesized in single step by reacting diethyl phosphorochloridate with various bioactive amines. The newly synthesized compounds 3a-j were tested for antibacterial activity against Gram-positive and Gram-negative bacteria. All the title compounds exhibited good activity. Amongst all the tested compounds, 3b (diethyl(4-(6-fluorobenzo(d)isoxazol-3-yl)piperidin-1-yl)phosphonate), 3c (diethyl 4, 6-difluorobenzo(d)thiazole-2-ylphosphoramidate) and 3d (diethyl 5-nitro-1H-indazol-1-yl- phosphonate) displayed promising antimicrobial activity against Pseudomonas aeruginosa and Trichoderma viride due to the presence of electron with drawing fluoro and nitro groups respectively.
{"title":"Convenient one-pot synthesis and biological evaluation of phosphoramidates and phosphonates containing heterocycles","authors":"Sk. Nayab Rasool, Ch. Subramanyam, D. B. Janakiramudu, P. Supraja, R. Usha, C. N. Raju","doi":"10.1080/10426507.2018.1452229","DOIUrl":"https://doi.org/10.1080/10426507.2018.1452229","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT A series of new phosphoramidates and phosphonates were synthesized in single step by reacting diethyl phosphorochloridate with various bioactive amines. The newly synthesized compounds 3a-j were tested for antibacterial activity against Gram-positive and Gram-negative bacteria. All the title compounds exhibited good activity. Amongst all the tested compounds, 3b (diethyl(4-(6-fluorobenzo(d)isoxazol-3-yl)piperidin-1-yl)phosphonate), 3c (diethyl 4, 6-difluorobenzo(d)thiazole-2-ylphosphoramidate) and 3d (diethyl 5-nitro-1H-indazol-1-yl- phosphonate) displayed promising antimicrobial activity against Pseudomonas aeruginosa and Trichoderma viride due to the presence of electron with drawing fluoro and nitro groups respectively.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75254868","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}
Pub Date : 2018-03-06DOI: 10.1080/10426507.2018.1436545
Efeturi A. Onoabedje, Obioma Chinwe Chinwuko, B. Ezema, M. A. Ezeokonkwo
GRAPHICAL ABSTRACT ABSTRACT A convenient synthesis of new polycyclic mixed phenothiazine-phenoxazine compounds is described. The cross-coupling of 2,4-diaminothiophenol with 2,3-dichloro-1,4-naphthoquin one at room temperature gave reddish brown 10-amino-6-chlorobenzo[a]phenoxazin-5-one which was converted into a benzoxazinophenothiazin-12-amine in 58% yield via reaction with 2-aminothiophenol under anhydrous basic conditions. A three-component one-pot synthesis improved the yield of benzoxazinophenothia-12-amine to 81% a in shorter time compared to two steps reactions. The synthesis of new azomethine derivatives of benzo[a]benzo[5,6] [1,4] oxazino [3,2-c] phenothiazin-12-amine with extended conjugations and excellent yields were also reported. The structural assignments of the prepared compounds were established by combine Ultraviolet-Visible, Fourier Transform Infrared, 1H and 13C Nuclear Magnetic Resonance Spectroscopies, Mass Spectrometry and elemental analytical data. The ease of preparations in high yields and their intense colourations make these compounds applicable as dyestuffs.
{"title":"Synthesis of polycyclic mixed phenothiazine-phenoxazine organic dyes","authors":"Efeturi A. Onoabedje, Obioma Chinwe Chinwuko, B. Ezema, M. A. Ezeokonkwo","doi":"10.1080/10426507.2018.1436545","DOIUrl":"https://doi.org/10.1080/10426507.2018.1436545","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT A convenient synthesis of new polycyclic mixed phenothiazine-phenoxazine compounds is described. The cross-coupling of 2,4-diaminothiophenol with 2,3-dichloro-1,4-naphthoquin one at room temperature gave reddish brown 10-amino-6-chlorobenzo[a]phenoxazin-5-one which was converted into a benzoxazinophenothiazin-12-amine in 58% yield via reaction with 2-aminothiophenol under anhydrous basic conditions. A three-component one-pot synthesis improved the yield of benzoxazinophenothia-12-amine to 81% a in shorter time compared to two steps reactions. The synthesis of new azomethine derivatives of benzo[a]benzo[5,6] [1,4] oxazino [3,2-c] phenothiazin-12-amine with extended conjugations and excellent yields were also reported. The structural assignments of the prepared compounds were established by combine Ultraviolet-Visible, Fourier Transform Infrared, 1H and 13C Nuclear Magnetic Resonance Spectroscopies, Mass Spectrometry and elemental analytical data. The ease of preparations in high yields and their intense colourations make these compounds applicable as dyestuffs.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82313734","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}
Pub Date : 2018-02-26DOI: 10.1080/10426507.2018.1436546
Jin-Lin Wan, Yiyuan Gan, Wei-nan Hu, Jiao Meng, Kun Tian, Xiao-qin Li, Shou-Qun Wu, Yang Xu, Gui-ping Ouyang, Zhenchao Wang
GRAPHICAL ABSTRACT ABSTRACT Novel 1,3,4-thiadiazole derivatives bearing a semicarbazone moiety were prepared and evaluated for their anti-bacterial activities against Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas axonopodis pv. citri (Xac) by performing a turbidimetre test. The products were structurally characterised by IR, 1H NMR, 13C NMR, 19F NMR and HRMS. Anti-bacterial testing showed that most of the evaluated compounds (6a-6s) exhibited excellent activity (≥74.19%) against Xoo at a concentration of 200 µg/mL, with 50% effective concentration (EC50) values ranging from 12.21 to 67.20 µg/mL, which were superior to the commercial antibacterial agent bismerthiazol (92.23 µg/mL). Among them, compound 2-((2-chloro-1H-indol-3-yl)methylene)-N-(5-((2-chlorobenzyl)thio)-1,3,4-thiadiazol-2-yl)hydrazine-1-carboxamide (6b) demonstrated good inhibitory activity against Xac (89.46% at 200 µg/mL) and Xoo (EC50 = 18.28 µg/mL); compound 2-((2-chloro-1H-indol-3-yl)methylene)-N-(5-((4-methoxybenzyl)thio)-1,3,4-thiadiazol-2-yl)hydrazine-1-carboxamide (6g) displayed excellent activity against Xoo with EC50 value of 12.21 µg/mL.
摘要本文制备了含有缩氨基脲基团的新型1,3,4-噻二唑衍生物，并对其抑菌活性进行了评价。稻瘟病菌(Xoo)和轴尾黄单胞菌(Xanthomonas axonopodis pv)。柠檬酸(Xac)进行浊度计试验。通过IR、1H NMR、13C NMR、19F NMR和HRMS对产物进行了结构表征。抑菌试验结果表明，大部分化合物(6a-6s)在200µg/mL的浓度下对Xoo具有良好的抑菌活性(≥74.19%)，50%有效浓度(EC50)在12.21 ~ 67.20µg/mL之间，优于市售抗菌剂双硫噻唑(92.23µg/mL)。其中，化合物2-((2-氯- 1h -吲哚-3-基)亚甲基)- n -(5-(2-氯苯基)硫)-1,3,4-噻二唑-2-基)肼-1-羧酰胺(6b)对Xac和Xoo具有良好的抑制活性(200µg/mL时为89.46%)(EC50 = 18.28µg/mL);化合物2-((2-氯- 1h -吲哚-3-基)亚甲基)- n -(5-(4-甲氧基苄基)硫)-1,3,4-噻二唑-2-基)肼-1-羧酰胺(6g)对Xoo具有良好的抑菌活性，EC50值为12.21µg/mL。
{"title":"Design, synthesis and anti-bacterial evaluation of novel 1,3,4-thiadiazole derivatives bearing a semicarbazone moiety","authors":"Jin-Lin Wan, Yiyuan Gan, Wei-nan Hu, Jiao Meng, Kun Tian, Xiao-qin Li, Shou-Qun Wu, Yang Xu, Gui-ping Ouyang, Zhenchao Wang","doi":"10.1080/10426507.2018.1436546","DOIUrl":"https://doi.org/10.1080/10426507.2018.1436546","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT Novel 1,3,4-thiadiazole derivatives bearing a semicarbazone moiety were prepared and evaluated for their anti-bacterial activities against Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas axonopodis pv. citri (Xac) by performing a turbidimetre test. The products were structurally characterised by IR, 1H NMR, 13C NMR, 19F NMR and HRMS. Anti-bacterial testing showed that most of the evaluated compounds (6a-6s) exhibited excellent activity (≥74.19%) against Xoo at a concentration of 200 µg/mL, with 50% effective concentration (EC50) values ranging from 12.21 to 67.20 µg/mL, which were superior to the commercial antibacterial agent bismerthiazol (92.23 µg/mL). Among them, compound 2-((2-chloro-1H-indol-3-yl)methylene)-N-(5-((2-chlorobenzyl)thio)-1,3,4-thiadiazol-2-yl)hydrazine-1-carboxamide (6b) demonstrated good inhibitory activity against Xac (89.46% at 200 µg/mL) and Xoo (EC50 = 18.28 µg/mL); compound 2-((2-chloro-1H-indol-3-yl)methylene)-N-(5-((4-methoxybenzyl)thio)-1,3,4-thiadiazol-2-yl)hydrazine-1-carboxamide (6g) displayed excellent activity against Xoo with EC50 value of 12.21 µg/mL.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86264018","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}
Pub Date : 2018-02-23DOI: 10.1080/10426507.2018.1437619
Ehsan Ghonchepour, M. Islami, H. Mostafavi, Ahmad Momeni Tikdari
GRAPHICAL ABSTRACT ABSTRACT A concise synthesis of new polysubstituted pyrazoles containing a phosphorane is achieved from readily available organic compounds. This C–H bond functionalization is an efficient means of selectively substituting 4-position of pyrazole to produce a five-membered aromatic ring with a chain containing ylide moiety. This protocol requires no additional catalyst and can be used for other pyrazoles including different substituents.
{"title":"Three-component reaction for an efficient synthesis of 5-hydroxy-1-phenyl-1H-pyrazoles containing a stable phosphorus ylide moiety","authors":"Ehsan Ghonchepour, M. Islami, H. Mostafavi, Ahmad Momeni Tikdari","doi":"10.1080/10426507.2018.1437619","DOIUrl":"https://doi.org/10.1080/10426507.2018.1437619","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT A concise synthesis of new polysubstituted pyrazoles containing a phosphorane is achieved from readily available organic compounds. This C–H bond functionalization is an efficient means of selectively substituting 4-position of pyrazole to produce a five-membered aromatic ring with a chain containing ylide moiety. This protocol requires no additional catalyst and can be used for other pyrazoles including different substituents.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74880008","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}
Pub Date : 2018-02-13DOI: 10.1080/10426507.2018.1436547
Mingwu Yu, Xiguang Liu, Q. Jiang, H. Du
GRAPHICAL ABSTRACT ABSTRACT An expeditious and convenient method to synthesize 9-allenylpurines via cesium carbonate catalyzed isomerization of 9-alkynylpurines has been successfully developed. The reactions proceeded rapidly under the base conditions and formed the desired products in good to excellent yields. The method was suitable with a broad substrate scope and proceeded well even on a multgram-scale. The obtained 9-allenylpurines were successfully applied to prepare various potential bioactive 9-acyclic nucleosides with high regioselectivity promoted by AgNO3.
{"title":"Expeditious synthesis of 9-allenylpurines via cesium carbonate catalyzed isomerization of 9-alkynylpurines","authors":"Mingwu Yu, Xiguang Liu, Q. Jiang, H. Du","doi":"10.1080/10426507.2018.1436547","DOIUrl":"https://doi.org/10.1080/10426507.2018.1436547","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT An expeditious and convenient method to synthesize 9-allenylpurines via cesium carbonate catalyzed isomerization of 9-alkynylpurines has been successfully developed. The reactions proceeded rapidly under the base conditions and formed the desired products in good to excellent yields. The method was suitable with a broad substrate scope and proceeded well even on a multgram-scale. The obtained 9-allenylpurines were successfully applied to prepare various potential bioactive 9-acyclic nucleosides with high regioselectivity promoted by AgNO3.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86641283","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}
Pub Date : 2018-02-01DOI: 10.1080/10426507.2017.1417307
A. Stepanov, V. Nuzhdin, V. Valeev, V. Vorobev, Y. Osin
GRAPHICAL ABSTRACT ABSTRACT The new results on the optical reflection of the Si surface layers implanted by silver ions at low energies of 30 keV over a wide dose range from 5.0 × 1014 to 1.5 × 1017 ion/cm2 are presented. As the ion dose of irradiation was increased, a monotonic decrease in the reflection intensity in the ultraviolet region of the spectrum was observed, due to amorphization and macrostructuring of the Si surface. On the other hand, in the long-wavelength region, a selective reflection band appears with a maximum near 830 nm due to plasmon resonance of Ag nanoparticles synthesized during implantation.
{"title":"Ag+-ion implantation of silicon","authors":"A. Stepanov, V. Nuzhdin, V. Valeev, V. Vorobev, Y. Osin","doi":"10.1080/10426507.2017.1417307","DOIUrl":"https://doi.org/10.1080/10426507.2017.1417307","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT The new results on the optical reflection of the Si surface layers implanted by silver ions at low energies of 30 keV over a wide dose range from 5.0 × 1014 to 1.5 × 1017 ion/cm2 are presented. As the ion dose of irradiation was increased, a monotonic decrease in the reflection intensity in the ultraviolet region of the spectrum was observed, due to amorphization and macrostructuring of the Si surface. On the other hand, in the long-wavelength region, a selective reflection band appears with a maximum near 830 nm due to plasmon resonance of Ag nanoparticles synthesized during implantation.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86251469","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}
Pub Date : 2018-02-01DOI: 10.1080/10426507.2017.1417305
N. Guenifi, R. Mahamdi, I. Rahmani
GRAPHICAL ABSTRACT ABSTRACT In this paper we have developed an algorithm of boron diffusion after thermal annealing in a highly doped polysilicon film. This algorithm takes into account electrically active point defects by associating some parameters such as boron solubility limit and diffusion coefficient. We have studied effect of annealing temperature in order to perform impact of this parameter on maximum depth diffusion of junction and maximum of concentration by analysis of Secondary Ion Mass Spectrometry (SIMS) profiles. In fact we have proposed numerical model based on Fick's equation, resolved by finite difference method under Matlab also we have simulated this phenomenon by Silvaco software.
{"title":"An algorithm for boron diffusion in MOS transistors using Silvaco Athena and MATLAB","authors":"N. Guenifi, R. Mahamdi, I. Rahmani","doi":"10.1080/10426507.2017.1417305","DOIUrl":"https://doi.org/10.1080/10426507.2017.1417305","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT In this paper we have developed an algorithm of boron diffusion after thermal annealing in a highly doped polysilicon film. This algorithm takes into account electrically active point defects by associating some parameters such as boron solubility limit and diffusion coefficient. We have studied effect of annealing temperature in order to perform impact of this parameter on maximum depth diffusion of junction and maximum of concentration by analysis of Secondary Ion Mass Spectrometry (SIMS) profiles. In fact we have proposed numerical model based on Fick's equation, resolved by finite difference method under Matlab also we have simulated this phenomenon by Silvaco software.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91262735","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}
Pub Date : 2018-02-01DOI: 10.1080/10426507.2017.1417301
K. Varaprasad
GRAPHICAL ABSTRACT ABSTRACT Development of efficient antimicrobial metal-oxide nanoparticles (MONPs) is important to advance in the biomedical and in the industrial fields. Herein, ZnO-CuO nanoparticles with improved antibacterial were developed by simple double precipitation technique and their properties were studied. The bactericide ability of ZnO-CuO nanoparticles was investigated against Escherichia coli. The ZnO-CuO0.5 exhibited high activity against E.coli at high and low concentration levels. The MONPs were analyzed via FTIR, UV-visible/DRS, PL, SEM/EDS, TEM, XRD and TGA analysis. These results show the formation of hexagonal wurtzite-monoclinic phase morphology and the thermal characteristics of the ZnO-CuO nanoparticles emphasize the potential of these dual nanooxide materials. The intensity of the emission band of ZnO was decreased following the increase in the CuO concentrations and the order is as follows: CuO < ZnO-CuO0.5 < ZnO-CuO0.1 < ZnO. The co-assembled MONPs developed may function as potential candidates for advanced biomedical and industrial applications.
{"title":"Co-assembled ZnO (shell) – CuO (core) nano-oxide materials for microbial protection","authors":"K. Varaprasad","doi":"10.1080/10426507.2017.1417301","DOIUrl":"https://doi.org/10.1080/10426507.2017.1417301","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT Development of efficient antimicrobial metal-oxide nanoparticles (MONPs) is important to advance in the biomedical and in the industrial fields. Herein, ZnO-CuO nanoparticles with improved antibacterial were developed by simple double precipitation technique and their properties were studied. The bactericide ability of ZnO-CuO nanoparticles was investigated against Escherichia coli. The ZnO-CuO0.5 exhibited high activity against E.coli at high and low concentration levels. The MONPs were analyzed via FTIR, UV-visible/DRS, PL, SEM/EDS, TEM, XRD and TGA analysis. These results show the formation of hexagonal wurtzite-monoclinic phase morphology and the thermal characteristics of the ZnO-CuO nanoparticles emphasize the potential of these dual nanooxide materials. The intensity of the emission band of ZnO was decreased following the increase in the CuO concentrations and the order is as follows: CuO < ZnO-CuO0.5 < ZnO-CuO0.1 < ZnO. The co-assembled MONPs developed may function as potential candidates for advanced biomedical and industrial applications.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83883581","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}
Pub Date : 2018-02-01DOI: 10.1080/10426507.2017.1417300
R. F. Álvarez-Estrada, I. M. de la Peña, M. L. Calvo
GRAPHICAL ABSTRACT ABSTRACT We outline some general properties of slow neutrons and their interactions in material media, their use in Boron Neutron Capture Therapy (BNCT) and their waveguiding properties. We review two important experiments on slow neutron confined propagation: in thin films and in polycapillary glass fibres. Based upon the first experiment and on previous proposals, we formulate two new proposals regarding possibilities for improved focalization (at and a bit below one micron) and propagation along longer lengths (up to about 1 m) with relatively small attenuation, and discuss possible implications for BNCT of small tumours. We emphasize the general interest and possible applications of exploring short scales by means of slow neutrons, through suitable combinations of the devices involved in those two experiments.
{"title":"Focalizing slow neutron beams at and below micron scales: Discussion on BNCT","authors":"R. F. Álvarez-Estrada, I. M. de la Peña, M. L. Calvo","doi":"10.1080/10426507.2017.1417300","DOIUrl":"https://doi.org/10.1080/10426507.2017.1417300","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT We outline some general properties of slow neutrons and their interactions in material media, their use in Boron Neutron Capture Therapy (BNCT) and their waveguiding properties. We review two important experiments on slow neutron confined propagation: in thin films and in polycapillary glass fibres. Based upon the first experiment and on previous proposals, we formulate two new proposals regarding possibilities for improved focalization (at and a bit below one micron) and propagation along longer lengths (up to about 1 m) with relatively small attenuation, and discuss possible implications for BNCT of small tumours. We emphasize the general interest and possible applications of exploring short scales by means of slow neutrons, through suitable combinations of the devices involved in those two experiments.","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74257526","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}
Pub Date : 2018-02-01DOI: 10.1080/10426507.2017.1417303
N. Guenifi, D. Bauza, R. Mahamdi
GRAPHICAL ABSTRACT ABSTRACT The Equilibrium Voltage Step (EVS) technique has been used for extraction of depth and energy concentration profile of traps situated in the oxide of a lightly stressed metal-oxide-semiconductor (MOS) structure. This has been achieved up to the very near Si-SiO2 interface. The results are discussed and compared with those obtained using charge pumping (CP) technique. A good agreement is achieved between the trap densities extracted using the two methods even though differences in the shape of the profiles can be observed. The results also very well agree with those published previously using current deep level transient spectroscopy (C-DLTS).
{"title":"Characterizing slow state near Si-SiO2 in MOS structure","authors":"N. Guenifi, D. Bauza, R. Mahamdi","doi":"10.1080/10426507.2017.1417303","DOIUrl":"https://doi.org/10.1080/10426507.2017.1417303","url":null,"abstract":"GRAPHICAL ABSTRACT ABSTRACT The Equilibrium Voltage Step (EVS) technique has been used for extraction of depth and energy concentration profile of traps situated in the oxide of a lightly stressed metal-oxide-semiconductor (MOS) structure. This has been achieved up to the very near Si-SiO2 interface. The results are discussed and compared with those obtained using charge pumping (CP) technique. A good agreement is achieved between the trap densities extracted using the two methods even though differences in the shape of the profiles can be observed. The results also very well agree with those published previously using current deep level transient spectroscopy (C-DLTS).","PeriodicalId":20043,"journal":{"name":"Phosphorus Sulfur and Silicon and The Related Elements","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74010692","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}
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