Pub Date : 2023-01-24DOI: 10.1080/01411594.2023.2167652
Xiong Li, Lianhong Zhang, Hongbo Wu, Qiang Li, Cheng Hu
ABSTRACT In this thesis, TiO2 was first prepared by one-step hydrothermal method, then HF was used as an F source, and TiO2 was treated by a DBD plasma reactor under an N2 atmosphere, and the F/N co-modification of TiO2 was realized. In the visible light catalytic degradation experiment of 60 mg/L methylene blue, the overall catalytic performance of the catalyst treated with DBD plasma for 80 min was the best, with a degradation rate of 91% in 10 min and 96% in 60 min. Result Indication: DBD plasma treatment did not affect the phase structure and morphology of TiO2, but formed surface defects and surface adsorption on its surface, and successfully doped two non-metallic elements, F and N, thereby enhancing the photocatalytic degradation activity. GRAPHICAL ABSTRACT
{"title":"Preparation and photocatalytic properties of DBD plasma F/N co-doping modified TiO2","authors":"Xiong Li, Lianhong Zhang, Hongbo Wu, Qiang Li, Cheng Hu","doi":"10.1080/01411594.2023.2167652","DOIUrl":"https://doi.org/10.1080/01411594.2023.2167652","url":null,"abstract":"ABSTRACT In this thesis, TiO2 was first prepared by one-step hydrothermal method, then HF was used as an F source, and TiO2 was treated by a DBD plasma reactor under an N2 atmosphere, and the F/N co-modification of TiO2 was realized. In the visible light catalytic degradation experiment of 60 mg/L methylene blue, the overall catalytic performance of the catalyst treated with DBD plasma for 80 min was the best, with a degradation rate of 91% in 10 min and 96% in 60 min. Result Indication: DBD plasma treatment did not affect the phase structure and morphology of TiO2, but formed surface defects and surface adsorption on its surface, and successfully doped two non-metallic elements, F and N, thereby enhancing the photocatalytic degradation activity. GRAPHICAL ABSTRACT","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"216 - 232"},"PeriodicalIF":1.6,"publicationDate":"2023-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43657811","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}
Pub Date : 2023-01-20DOI: 10.1080/01411594.2023.2167656
E. Juszyńska-Gałązka, W. Zając
ABSTRACT Three mesogenic compounds: n-cyano-3-fluorophenyl 4-butylbenzoates (n = 4,6,8), abbreviated 4CFPB, 6CFPB, and 8CFPB contained in mesoporous Anodic Aluminium Oxide (AAO) membranes were subjected to Small Angle Neutron Scattering measurements with the aim to test the feasibility of SANS experiment as a means of detecting a boundary layer and estimating its thickness. This proved successful for 4CFB and 6CFPB in 18 nm pores, and indicative in 35 nm pores. The thickness of the boundary layer was estimated by core-shell SANS models at ca. 23–26 Å (2.3–2.6 nm).
摘要采用小角中子散射法对介孔阳极氧化铝(AAO)膜中含有的3种介孔化合物n-氰基-3-氟苯基- 4-丁基苯甲酸酯(n = 4,6,8)、简称4CFPB、6CFPB和8CFPB进行了测量，目的是验证用SANS实验检测边界层和估计边界层厚度的可行性。结果表明，4CFB和6CFPB在18 nm的孔隙中取得了成功，在35 nm的孔隙中也取得了成功。通过核壳SANS模型估计边界层的厚度约为23-26 Å (2.3-2.6 nm)。
{"title":"Small angle neutron scattering on n-cyano-3-fluorophenyl 4-butylbenzoates (n = 4,6,8) liquid crystals in mesoporous AAO membranes. A feasibility study","authors":"E. Juszyńska-Gałązka, W. Zając","doi":"10.1080/01411594.2023.2167656","DOIUrl":"https://doi.org/10.1080/01411594.2023.2167656","url":null,"abstract":"ABSTRACT Three mesogenic compounds: n-cyano-3-fluorophenyl 4-butylbenzoates (n = 4,6,8), abbreviated 4CFPB, 6CFPB, and 8CFPB contained in mesoporous Anodic Aluminium Oxide (AAO) membranes were subjected to Small Angle Neutron Scattering measurements with the aim to test the feasibility of SANS experiment as a means of detecting a boundary layer and estimating its thickness. This proved successful for 4CFB and 6CFPB in 18 nm pores, and indicative in 35 nm pores. The thickness of the boundary layer was estimated by core-shell SANS models at ca. 23–26 Å (2.3–2.6 nm).","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"89 - 96"},"PeriodicalIF":1.6,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45465872","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}
Pub Date : 2023-01-12DOI: 10.1080/01411594.2022.2162897
H. Zandvliet
ABSTRACT We have determined the temperature dependent phase diagram of the square 2D Ising lattice with anisotropic nearest neighbor ( ) and isotropic next-nearest neighbor ( ) interactions. The phase boundaries between the various ordered phases (ferromagnetic, antiferromagnetic and striped antiferromagnetic) and the disordered phase (paramagnetic) are obtained by considering the domain wall free energy. Although the phase boundary equations are not exact, they provide a very accurate description when the nearest neighbor interactions are stronger than the next-nearest neighbor interaction. The square 2D Ising lattice does not exhibit a phase transition when if and have the same sign or if and have opposite signs.
{"title":"Phase diagram of the square 2D Ising lattice with nearest neighbor and next-nearest neighbor interactions","authors":"H. Zandvliet","doi":"10.1080/01411594.2022.2162897","DOIUrl":"https://doi.org/10.1080/01411594.2022.2162897","url":null,"abstract":"ABSTRACT We have determined the temperature dependent phase diagram of the square 2D Ising lattice with anisotropic nearest neighbor ( ) and isotropic next-nearest neighbor ( ) interactions. The phase boundaries between the various ordered phases (ferromagnetic, antiferromagnetic and striped antiferromagnetic) and the disordered phase (paramagnetic) are obtained by considering the domain wall free energy. Although the phase boundary equations are not exact, they provide a very accurate description when the nearest neighbor interactions are stronger than the next-nearest neighbor interaction. The square 2D Ising lattice does not exhibit a phase transition when if and have the same sign or if and have opposite signs.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"187 - 195"},"PeriodicalIF":1.6,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47140058","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}
Pub Date : 2023-01-11DOI: 10.1080/01411594.2022.2164495
R. Chandrashekhar, A. A. Yadav
ABSTRACT RuO2 electrodes were spray-deposited utilizing an aqueous/organic solvent mixture at varied substrate temperatures. X-ray diffraction data supported the rutile structure and tetragonal phase of RuO2. FESEM images showed a porous structure with small spherical grains covering the entire substrate surface. Optical studies have shown that RuO2 films have bandgaps between 1.90 and 2.13 eV. Electrical resistivity was found in the range of 0.57 × 104 Ω-cm to 1.23 × 104 Ω-cm. CV (scan rate 5 mVs−1) results confirmed the specific capacitances of 560, 637, 687, 602 and 527 Fg−1 at substrate temperatures of 250, 275, 290, 300 and 325°C, respectively, in 0.5 M H2SO4 electrolyte. RuO2 provided a high specific capacitance 741 Fg−1 (current density 0.5 Ag−1) from GCD profile besides good specific capacitance holding of 87.66% over 3000 continuous charge–discharge cycles. The results show that RuO2 films spray deposited with aqueous/organic solvent mixtures give the best results.
{"title":"Performance of supercapacitors with RuO2 electrodes spray deposited with aqueous/organic solvent mixtures: effect of substrate temperature","authors":"R. Chandrashekhar, A. A. Yadav","doi":"10.1080/01411594.2022.2164495","DOIUrl":"https://doi.org/10.1080/01411594.2022.2164495","url":null,"abstract":"ABSTRACT RuO2 electrodes were spray-deposited utilizing an aqueous/organic solvent mixture at varied substrate temperatures. X-ray diffraction data supported the rutile structure and tetragonal phase of RuO2. FESEM images showed a porous structure with small spherical grains covering the entire substrate surface. Optical studies have shown that RuO2 films have bandgaps between 1.90 and 2.13 eV. Electrical resistivity was found in the range of 0.57 × 104 Ω-cm to 1.23 × 104 Ω-cm. CV (scan rate 5 mVs−1) results confirmed the specific capacitances of 560, 637, 687, 602 and 527 Fg−1 at substrate temperatures of 250, 275, 290, 300 and 325°C, respectively, in 0.5 M H2SO4 electrolyte. RuO2 provided a high specific capacitance 741 Fg−1 (current density 0.5 Ag−1) from GCD profile besides good specific capacitance holding of 87.66% over 3000 continuous charge–discharge cycles. The results show that RuO2 films spray deposited with aqueous/organic solvent mixtures give the best results.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"196 - 215"},"PeriodicalIF":1.6,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42914501","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}
Pub Date : 2022-12-31DOI: 10.1080/01411594.2022.2159406
M. Orzechowska, K. Rećko, D. Soloviov, U. Klekotka, M. Biernacka, D. Satuła, W. Olszewski, B. Kalska-Szostko, A. Beskrovnyy, K. Szymański
ABSTRACT The influence of the surface modification on the magnetism of 4–14 nm sized core and core/shell gallium ferrites obtained by different preparation methods (Massart’s and thermal decomposition from acetylacetonates) was studied. The physical properties of GaxFe3-xO4 were investigated in a wide range of Ga admixtures 0 ≤ x ≤ 1.5. Ga ions location at 8a or/and 16d positions of a spinel structure depends on the synthesis method and has a pronounced effect on the superparamagnetic properties of nanoparticles. Magnetization and Mössbauer experiments show the dominant superparamagnetic contribution for the nanoparticles with x > 0.8 with the blocking temperature TB significantly below 200 K. Surface-modified nanoferrites disclosed spontaneous magnetization that does not exceed 60 emu/g.
{"title":"Selected properties of surface modified GaxFe3-xO4 with 0≤x≤1.5","authors":"M. Orzechowska, K. Rećko, D. Soloviov, U. Klekotka, M. Biernacka, D. Satuła, W. Olszewski, B. Kalska-Szostko, A. Beskrovnyy, K. Szymański","doi":"10.1080/01411594.2022.2159406","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159406","url":null,"abstract":"ABSTRACT The influence of the surface modification on the magnetism of 4–14 nm sized core and core/shell gallium ferrites obtained by different preparation methods (Massart’s and thermal decomposition from acetylacetonates) was studied. The physical properties of GaxFe3-xO4 were investigated in a wide range of Ga admixtures 0 ≤ x ≤ 1.5. Ga ions location at 8a or/and 16d positions of a spinel structure depends on the synthesis method and has a pronounced effect on the superparamagnetic properties of nanoparticles. Magnetization and Mössbauer experiments show the dominant superparamagnetic contribution for the nanoparticles with x > 0.8 with the blocking temperature TB significantly below 200 K. Surface-modified nanoferrites disclosed spontaneous magnetization that does not exceed 60 emu/g.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"97 - 104"},"PeriodicalIF":1.6,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47979626","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}
Pub Date : 2022-12-31DOI: 10.1080/01411594.2022.2159404
K. Rećko, M. Orzechowska, W. Olszewski, A. Beskrovnyy, M. Biernacka, U. Klekotka, A. Miaskowski, K. Szymański
ABSTRACT The structural, magnetic and calorimetric properties of Fe2.4Ga0.6O4 nanoferrite have been investigated. X-ray and neutron diffraction coupled analyses using Rietveld refinements have shown that the samples under investigation, obtained by different bottom-up methods, crystalize with a cubic structure in the space group (N° 227). The Ga3+ ions preferentially occupying the tetrahedral sublattice of the inverse spinel partly screen the dipole–dipole interactions and lead to the reduction of the magnetic response of Fe3+ ones. Calorimetric measurements confirm that the nanosized Fe2.4Ga0.6O4 system weakly agglomerates and simultaneously collect and release optimal amount of heat under the influence of an alternating magnetic field with the 15.3 kA/m of maximum magnetic field strength and 532 kHz of frequency. The values of the specific absorption coefficients obtained for gallium ferrites, similar to those typical for cobalt ferrites used commercially in biomedicine, together with very low superparamagnetic blocking temperature validated by Mössbauer spectroscopy analysis, make the system an attractive therapeutic material.
{"title":"Investigations on the enhancement of thermomagnetic properties in Fe2.4Ga0.6O4","authors":"K. Rećko, M. Orzechowska, W. Olszewski, A. Beskrovnyy, M. Biernacka, U. Klekotka, A. Miaskowski, K. Szymański","doi":"10.1080/01411594.2022.2159404","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159404","url":null,"abstract":"ABSTRACT The structural, magnetic and calorimetric properties of Fe2.4Ga0.6O4 nanoferrite have been investigated. X-ray and neutron diffraction coupled analyses using Rietveld refinements have shown that the samples under investigation, obtained by different bottom-up methods, crystalize with a cubic structure in the space group (N° 227). The Ga3+ ions preferentially occupying the tetrahedral sublattice of the inverse spinel partly screen the dipole–dipole interactions and lead to the reduction of the magnetic response of Fe3+ ones. Calorimetric measurements confirm that the nanosized Fe2.4Ga0.6O4 system weakly agglomerates and simultaneously collect and release optimal amount of heat under the influence of an alternating magnetic field with the 15.3 kA/m of maximum magnetic field strength and 532 kHz of frequency. The values of the specific absorption coefficients obtained for gallium ferrites, similar to those typical for cobalt ferrites used commercially in biomedicine, together with very low superparamagnetic blocking temperature validated by Mössbauer spectroscopy analysis, make the system an attractive therapeutic material.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"105 - 114"},"PeriodicalIF":1.6,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46953466","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}
Pub Date : 2022-12-31DOI: 10.1080/01411594.2022.2159822
A. Kpadonou, R. Yessoufou, R. Houenou, E. Albayrak
ABSTRACT The ferrimagnetic-ferromagnetic-ferrimagnetic quaternary alloy consisting of the spins , , and in the form of with B, C and D being the possible nearest-neighbors of A with the probabilities p, q and r, respectively, is investigated in terms of the mean field theory (MFT) based on the Bogoliubov inequality for free energy. The thermal behaviors of magnetizations belonging to the individual spins and total magnetization are examined in detail to map the possible phase diagrams on various planes. It was found that the model only exhibits second-order phase transitions in addition to one compensation temperature for appropriate values of the system parameters. In order to support the existence of the compensation temperatures, we have also carried out the Monte Carlo (MC) simulations and an agreement was shown with the predicted result of the MFT approach. We have also analyzed the effects of the bilinear interaction parameter between type-A atoms and the exchange interaction parameter ratio ( is the bilinear interaction parameter between type-A atoms and type-X atoms with X = C or D) on compensation temperatures. Our findings are compared to those reported in the literature and suitable agreements are observed.
{"title":"Magnetic properties of the quaternary alloy with the mixtures of integer and half-integer spins","authors":"A. Kpadonou, R. Yessoufou, R. Houenou, E. Albayrak","doi":"10.1080/01411594.2022.2159822","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159822","url":null,"abstract":"ABSTRACT The ferrimagnetic-ferromagnetic-ferrimagnetic quaternary alloy consisting of the spins , , and in the form of with B, C and D being the possible nearest-neighbors of A with the probabilities p, q and r, respectively, is investigated in terms of the mean field theory (MFT) based on the Bogoliubov inequality for free energy. The thermal behaviors of magnetizations belonging to the individual spins and total magnetization are examined in detail to map the possible phase diagrams on various planes. It was found that the model only exhibits second-order phase transitions in addition to one compensation temperature for appropriate values of the system parameters. In order to support the existence of the compensation temperatures, we have also carried out the Monte Carlo (MC) simulations and an agreement was shown with the predicted result of the MFT approach. We have also analyzed the effects of the bilinear interaction parameter between type-A atoms and the exchange interaction parameter ratio ( is the bilinear interaction parameter between type-A atoms and type-X atoms with X = C or D) on compensation temperatures. Our findings are compared to those reported in the literature and suitable agreements are observed.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"43 - 57"},"PeriodicalIF":1.6,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44038888","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}
Pub Date : 2022-12-31DOI: 10.1080/01411594.2022.2159823
Khushbu, S. Sushanth Kumar, Anupinder Singh, Parveen Kumar
ABSTRACT Polycrystalline ceramic samples with compositional formula Ba(1-x)PbxTi(1-x) ZrxO3 (x = 0, 0.05, 0.075, 0.10, 0.15, 0.20) were prepared by the conventional solid-state reaction route (SSR). All the samples were sintered at 1300°C for 4 h in closed high-density alumina crucibles with the lead-rich environment. Sintered samples were subjected to X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) for structural analysis. XRD analysis confirmed tetragonal to orthorhombic phase transition for samples with x ≥ 0.10. The relative permittivity and loss were measured as a function of temperature at 1, 10, 100 and 1000 kHz frequencies. The value of relative permittivity at room temperature was found to be increased with an increase in x. PE hysteresis loops were recorded for all the samples (at 30°C and 50 Hz). It was found that the sample with x = 0.05 shows the maximum value of remanent polarization ‘Pr’ = 18.51 µC/cm2.
{"title":"Structural, dielectric and ferroelectric properties of Ba(1-x)PbxTi(1-x)ZrxO3 ceramics","authors":"Khushbu, S. Sushanth Kumar, Anupinder Singh, Parveen Kumar","doi":"10.1080/01411594.2022.2159823","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159823","url":null,"abstract":"ABSTRACT Polycrystalline ceramic samples with compositional formula Ba(1-x)PbxTi(1-x) ZrxO3 (x = 0, 0.05, 0.075, 0.10, 0.15, 0.20) were prepared by the conventional solid-state reaction route (SSR). All the samples were sintered at 1300°C for 4 h in closed high-density alumina crucibles with the lead-rich environment. Sintered samples were subjected to X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) for structural analysis. XRD analysis confirmed tetragonal to orthorhombic phase transition for samples with x ≥ 0.10. The relative permittivity and loss were measured as a function of temperature at 1, 10, 100 and 1000 kHz frequencies. The value of relative permittivity at room temperature was found to be increased with an increase in x. PE hysteresis loops were recorded for all the samples (at 30°C and 50 Hz). It was found that the sample with x = 0.05 shows the maximum value of remanent polarization ‘Pr’ = 18.51 µC/cm2.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"58 - 65"},"PeriodicalIF":1.6,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42736914","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}
Pub Date : 2022-12-27DOI: 10.1080/01411594.2022.2159403
J. Chruściel, A. Rudzki, M. Ossowska-Chruściel, S. Zalewski
ABSTRACT The nature of the SmA*–SmC* phase transition was studied in three chiral liquid crystal compounds, in two belonging to the same homologous series, (S)-1-methylheptyl-4-(4′-alkoxybiphenylthiocarboxy)-benzoates, (S)-MHPSBOn, where n = 7 and 8 is the number of carbon atoms in the alkyl chain and (S)-4-[(4-{1-methylheptylcarboxyl} phenyl) carbonylthio] phenyl-4′-decyloxy-1-benzenecarboxylate (10OPOSMH). Compounds (S)-MHPSBO7 and (S)-MHPSBO8 show different behavior in the SmA*–SmC* phase transition, in MHPSBO7 the SmA* phase is the de Vries phase, while in MHPSBO8 it is the classic SmA* phase. The aim of the study is to demonstrate the presence of the de Vries type SmA * phase in three chiral thiobenzoates. The electro-optical method and SAXS were used to analyze the SmA*–SmC* transition.
{"title":"Studies of de Vries SmA* type phase in chiral thiobenzoates","authors":"J. Chruściel, A. Rudzki, M. Ossowska-Chruściel, S. Zalewski","doi":"10.1080/01411594.2022.2159403","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159403","url":null,"abstract":"ABSTRACT The nature of the SmA*–SmC* phase transition was studied in three chiral liquid crystal compounds, in two belonging to the same homologous series, (S)-1-methylheptyl-4-(4′-alkoxybiphenylthiocarboxy)-benzoates, (S)-MHPSBOn, where n = 7 and 8 is the number of carbon atoms in the alkyl chain and (S)-4-[(4-{1-methylheptylcarboxyl} phenyl) carbonylthio] phenyl-4′-decyloxy-1-benzenecarboxylate (10OPOSMH). Compounds (S)-MHPSBO7 and (S)-MHPSBO8 show different behavior in the SmA*–SmC* phase transition, in MHPSBO7 the SmA* phase is the de Vries phase, while in MHPSBO8 it is the classic SmA* phase. The aim of the study is to demonstrate the presence of the de Vries type SmA * phase in three chiral thiobenzoates. The electro-optical method and SAXS were used to analyze the SmA*–SmC* transition.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"157 - 165"},"PeriodicalIF":1.6,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42803073","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}
Pub Date : 2022-12-27DOI: 10.1080/01411594.2022.2159405
A. Rudzki
ABSTRACT The results of studies conducted by means complementary methods: differential scanning calorimetry, transmitted light intensity measurements, polarized optical microscopy and electrooptical methods of two new liquid crystal mixtures are presented. The investigated mixtures consist of achiral thiosobenzoates, 7OS5 and 8OS5, and a chiral addition of benzoate, MHOBCO6. In all mixtures there is a wide low temperature range of the existence of the ferroelectric SmC* phase.
{"title":"Liquid crystal mixtures with the chiral benzoate dopant","authors":"A. Rudzki","doi":"10.1080/01411594.2022.2159405","DOIUrl":"https://doi.org/10.1080/01411594.2022.2159405","url":null,"abstract":"ABSTRACT The results of studies conducted by means complementary methods: differential scanning calorimetry, transmitted light intensity measurements, polarized optical microscopy and electrooptical methods of two new liquid crystal mixtures are presented. The investigated mixtures consist of achiral thiosobenzoates, 7OS5 and 8OS5, and a chiral addition of benzoate, MHOBCO6. In all mixtures there is a wide low temperature range of the existence of the ferroelectric SmC* phase.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"139 - 148"},"PeriodicalIF":1.6,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46513658","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}
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