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Antonio Martins Figueiredo Neto - One of the best experts on this subject based on the ideXlab platform.

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/alcohol (n–OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic—ChD, cholesteric biaxial—ChB, and cholesteric calamitic—ChC). The ChD-to-ChB Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the ChD and the ChC Phases, without the presence of the ChB Phase in between. These results are interpreted in...

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K(2)SO(4))/alcohol (n-OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic-Ch(D), cholesteric biaxial-Ch(B), and cholesteric calamitic-Ch(C)). The Ch(D)-to-Ch(B) Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the Ch(D) and the Ch(C) Phases, without the presence of the Ch(B) Phase in between. These results are interpreted in terms of the nanosegregation of the alcohol molecules in the micelles with respect to the main amphiphiles molecules.

Yuheng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • scaling analysis of pm fm Phase Transition in nd0 5sr0 25ca0 25mno3 based on magnetic entropy change
    Materials Chemistry and Physics, 2014
    Co-Authors: Jiyu Fan, Weichun Zhang, Xiyuan Zhang, Lei Zhang, Yuheng Zhang
    Abstract:

    The dependence of magnetization M on temperature T and the applied magnetic field H were measured for the half-doping manganite Nd0.5Sr0.25Ca0.25MnO3. The M(T) curve exhibits that a paramagnetic (PM)–ferromagnetic (FM) Phase Transition occurs around 174 K. The PM–FM Phase Transition is considered to be a second-Order Phase Transition due to the absence of hysteresis on its heating and cooling M(T) curves. Moreover, the second-Order Phase Transition can be testified with the positive slope in Arrott plots. However, the scaling analysis of magnetic entropy change exhibits that ΔSM(T) curves do not collapse into a single universal curve, indicating that the observed PM–FM Phase Transition is not an authentic second-Order Phase Transition. Due to the appearance of short-range FM coupling in PM region, the PM–FM Phase Transition at 225 K > T > 188 K is a first-Order Phase Transition. The second-Order Phase Transition only occurs at T < 188 K. When the magnetic field is increased above 1.5 T, the first-Order Phase Transition can be converted into the second-Order Phase Transition. The results shows that the magnetic entropy change scaling is an effective method to determine the nature of the PM–FM Phase Transition.

  • scaling analysis of pm fm Phase Transition in nd0 5sr0 25ca0 25mno3 based on magnetic entropy change
    Materials Chemistry and Physics, 2014
    Co-Authors: Jiyu Fan, Weichun Zhang, Xiyuan Zhang, Lei Zhang, Yuheng Zhang
    Abstract:

    Abstract The dependence of magnetization M on temperature T and the applied magnetic field H were measured for the half-doping manganite Nd0.5Sr0.25Ca0.25MnO3. The M(T) curve exhibits that a paramagnetic (PM)–ferromagnetic (FM) Phase Transition occurs around 174 K. The PM–FM Phase Transition is considered to be a second-Order Phase Transition due to the absence of hysteresis on its heating and cooling M(T) curves. Moreover, the second-Order Phase Transition can be testified with the positive slope in Arrott plots. However, the scaling analysis of magnetic entropy change exhibits that ΔSM(T) curves do not collapse into a single universal curve, indicating that the observed PM–FM Phase Transition is not an authentic second-Order Phase Transition. Due to the appearance of short-range FM coupling in PM region, the PM–FM Phase Transition at 225 K > T > 188 K is a first-Order Phase Transition. The second-Order Phase Transition only occurs at T

Dennys Reis - One of the best experts on this subject based on the ideXlab platform.

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/alcohol (n–OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic—ChD, cholesteric biaxial—ChB, and cholesteric calamitic—ChC). The ChD-to-ChB Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the ChD and the ChC Phases, without the presence of the ChB Phase in between. These results are interpreted in...

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K(2)SO(4))/alcohol (n-OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic-Ch(D), cholesteric biaxial-Ch(B), and cholesteric calamitic-Ch(C)). The Ch(D)-to-Ch(B) Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the Ch(D) and the Ch(C) Phases, without the presence of the Ch(B) Phase in between. These results are interpreted in terms of the nanosegregation of the alcohol molecules in the micelles with respect to the main amphiphiles molecules.

Erol Akpinar - One of the best experts on this subject based on the ideXlab platform.

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/alcohol (n–OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic—ChD, cholesteric biaxial—ChB, and cholesteric calamitic—ChC). The ChD-to-ChB Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the ChD and the ChC Phases, without the presence of the ChB Phase in between. These results are interpreted in...

  • effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial Phase Transitions in a potassium laurate alcohol potassium sulfate water brucine lyotropic mixture evidence of a first Order Phase Transition
    Journal of Physical Chemistry B, 2013
    Co-Authors: Dennys Reis, Erol Akpinar, Antonio Martins Figueiredo Neto
    Abstract:

    Lyotropic cholesteric liquid crystalline Phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K(2)SO(4))/alcohol (n-OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial Phase Transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the Phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 ≤ n ≤ 12 presented the three cholesteric Phases (cholesteric discotic-Ch(D), cholesteric biaxial-Ch(B), and cholesteric calamitic-Ch(C)). The Ch(D)-to-Ch(B) Transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-Order Phase Transition between the Ch(D) and the Ch(C) Phases, without the presence of the Ch(B) Phase in between. These results are interpreted in terms of the nanosegregation of the alcohol molecules in the micelles with respect to the main amphiphiles molecules.

Jiyu Fan - One of the best experts on this subject based on the ideXlab platform.

  • scaling analysis of pm fm Phase Transition in nd0 5sr0 25ca0 25mno3 based on magnetic entropy change
    Materials Chemistry and Physics, 2014
    Co-Authors: Jiyu Fan, Weichun Zhang, Xiyuan Zhang, Lei Zhang, Yuheng Zhang
    Abstract:

    The dependence of magnetization M on temperature T and the applied magnetic field H were measured for the half-doping manganite Nd0.5Sr0.25Ca0.25MnO3. The M(T) curve exhibits that a paramagnetic (PM)–ferromagnetic (FM) Phase Transition occurs around 174 K. The PM–FM Phase Transition is considered to be a second-Order Phase Transition due to the absence of hysteresis on its heating and cooling M(T) curves. Moreover, the second-Order Phase Transition can be testified with the positive slope in Arrott plots. However, the scaling analysis of magnetic entropy change exhibits that ΔSM(T) curves do not collapse into a single universal curve, indicating that the observed PM–FM Phase Transition is not an authentic second-Order Phase Transition. Due to the appearance of short-range FM coupling in PM region, the PM–FM Phase Transition at 225 K > T > 188 K is a first-Order Phase Transition. The second-Order Phase Transition only occurs at T < 188 K. When the magnetic field is increased above 1.5 T, the first-Order Phase Transition can be converted into the second-Order Phase Transition. The results shows that the magnetic entropy change scaling is an effective method to determine the nature of the PM–FM Phase Transition.

  • scaling analysis of pm fm Phase Transition in nd0 5sr0 25ca0 25mno3 based on magnetic entropy change
    Materials Chemistry and Physics, 2014
    Co-Authors: Jiyu Fan, Weichun Zhang, Xiyuan Zhang, Lei Zhang, Yuheng Zhang
    Abstract:

    Abstract The dependence of magnetization M on temperature T and the applied magnetic field H were measured for the half-doping manganite Nd0.5Sr0.25Ca0.25MnO3. The M(T) curve exhibits that a paramagnetic (PM)–ferromagnetic (FM) Phase Transition occurs around 174 K. The PM–FM Phase Transition is considered to be a second-Order Phase Transition due to the absence of hysteresis on its heating and cooling M(T) curves. Moreover, the second-Order Phase Transition can be testified with the positive slope in Arrott plots. However, the scaling analysis of magnetic entropy change exhibits that ΔSM(T) curves do not collapse into a single universal curve, indicating that the observed PM–FM Phase Transition is not an authentic second-Order Phase Transition. Due to the appearance of short-range FM coupling in PM region, the PM–FM Phase Transition at 225 K > T > 188 K is a first-Order Phase Transition. The second-Order Phase Transition only occurs at T