Crystallization Kinetics Study on Tilted Ordering in N-(p-n-Alkoxybenzylidene)-p-n-Alkylanilines (nO·m Compounds) by Thermal and Electrical Techniques Part II

Chitravel, T.; Mohan, M. L. N. Madhu; Krishnakumar, V.

doi:10.1080/15421400802406422

Cited by 18 publications

(6 citation statements)

References 7 publications

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“…The kineto phase which occurs prior to the crystallization is solely responsible for many combinational factors of the crystallization mechanism. In the present study of 16A+11BA and 16A+12BA complexes the kineto phase prior to crystallization is Smectic G. Our previous studies [5,6,10,11] on different nO.m compounds exhibiting various kineto phases concurred with data of the present investigations. Further in Smectic G, as expected, the rate of crystallization is rapid as it is close to crystalline phase.…”

Section: The Process Of Crystallizationsupporting

confidence: 81%

“…It was earlier proposed by us [10] that the crystallization kinetics can also be studied and analyzed at a selected frequency with the dielectric data. The crystallization kinetics relating to the phase transition from Smectic G to the melt of 16A+11BA is selectively performed at same predetermined crystallization temperatures viz., 70 o C, 60 o C, 57 o C and 50 o C respectively at an excitation frequency of 500 Hz.…”

Section: Crystallization Kinetics Through Dielectric Studiesmentioning

confidence: 99%

“…The inter molecular hydrogen bonded p-n-alkoxybenzoic acids (nABA) and hexadecylaniline liquid crystalline materials exhibits a fascinating mesomorphic behaviour associated with a distinct molecular ordering; the convenient working thermal range makes them suitable for systematic kinetic investigations. In continuation of our experimental studies [4][5][6][7][8][9][10][11] on liquid crystals here we present a detailed analysis of two smectogens of the hexadecylaniline series namely 16A+11BA and 16A+12BA. * Electronic address: mln.madhu@gmail.com…”

Section: Introductionmentioning

confidence: 99%

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Inter hydrogen bonded complexes of hexadecylaniline and alkoxy benzoic acids: a study of crystallization kinetics

Vijayakumar¹,

Murugadass²,

Mohan³

2009

Braz. J. Phys.

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A systematic crystallization kinetic study of two smectogens of homologous series of the inter molecular hydrogen bonded between undecyl, dodecyl benzoic acids and hexadecylaniline complexes viz., 16A+11BA and 16A+12BA respectively has been carried out by thermal microscopy, differential scanning calorimetry (DSC) and dielectric studies. FTIR studies indicate the formation of hydrogen bond in these complexes. The crystallization kinetics was studied by two techniques viz., the traditional thermal analysis (DSC) and electrical studies in which capacitance and dielectric loss variation with temperature were recorded and analyzed. The DSC thermograms were run from crystallization temperature to the isotropic melt for different time intervals. The liquid crystalline behaviour together with the rate of crystallization of smectic ordering in newly synthesized inter hydrogen bonded complexes were discussed in relation to the kinetophase (which occurs prior to the crystallization). The molecular mechanism and dimensionality in the crystal growth were computed from the Avrami equation. The characteristic crystallization time (t*) at each crystallization temperature was deduced from the individual plots of log t and ∆H. Further, it was observed that the data obtained from DSC and dielectric studies were in good agreement with one another. For the first time in the history of crystallization studies, crystallization kinetics data is experimentally elicited from a novel dielectric technique.

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Section: The Process Of Crystallizationsupporting

confidence: 81%

Section: Crystallization Kinetics Through Dielectric Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inter hydrogen bonded complexes of hexadecylaniline and alkoxy benzoic acids: a study of crystallization kinetics

Vijayakumar¹,

Murugadass²,

Mohan³

2009

Braz. J. Phys.

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“…With our previous experience [23][24][25][26][27][28][29][30], in designing, synthesizing and characterizing various types of liquid crystals, a successful attempt has been made in characterizing a novel series of inter hydrogen bonded liquid crystal exhibiting optical shutter activity in cholesteric phase of LTA+11BA hydrogen bonded complex.…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence of an optical shutter in cholesteric phase of a double hydrogen bonded liquid crystal

Vijayakumar¹,

Mohan²

2009

Braz. J. Phys.

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A novel series of double hydrogen bonded liquid crystals have been isolated. Hydrogen bond was formed between non mesogen chiral ingredient levo tartaric acid (LTA) and mesogenic undecyloxy benzoic acids (11BA) Thermal and electrical properties exhibited by levo tartaric acid and undecyloxy benzoic acid (LTA+11BA) were discussed. Interesting feature of the present investigation was observation of an optical shuttering action in LTA+11BA hydrogen bonded complex on application of a stipulated applied dc bias voltage. By enhancement of the dc bias voltage the mesogen behaves like an optical shutter, thus this hydrogen bonded complex mesogen acts as an effective light modulator. It was noticed that this action of shuttering was reversible, in the sense that when applied bias voltage was removed the original texture was restored. Experimental results relating to textures, optical tilt, dielectric studies and optical shuttering action were presented. This optical shutter property of the mesogen can be exploited for commercial and display device applications.

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“…The central theme of this work is to study the physical and chemical properties of HBLC formed by alkyl and alkoxy carboxylic acids. With our previous experience [29][30][47][48][49][50][51][52][53][54][55][56][57] in designing, synthesizing liquid crystals and in continuation of our efforts to understand hydrogen bonded mesogens, eight such homologues series designated as mOØn (where n varied from 2 to 8 while m varied from 5 to 12, respectively) can be deduced with changing the alkyl and alkoxy carbon number. A systematic study for 12OØn and 11OØn homologues series has been carried out [58] by the authors.…”

Section: Introductionmentioning

confidence: 99%

Design, synthesis and characterization of a linear hydrogen bonded homologous series exhibiting reentrant smectic C ordering

Kavitha¹,

Mohan²

2012

Journal of Physics and Chemistry of Solids

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Crystallization Kinetics Study on Tilted Ordering in N-(p-n-Alkoxybenzylidene)-p-n-Alkylanilines (nO·m Compounds) by Thermal and Electrical Techniques Part II

Cited by 18 publications

References 7 publications

Inter hydrogen bonded complexes of hexadecylaniline and alkoxy benzoic acids: a study of crystallization kinetics

Inter hydrogen bonded complexes of hexadecylaniline and alkoxy benzoic acids: a study of crystallization kinetics

Experimental evidence of an optical shutter in cholesteric phase of a double hydrogen bonded liquid crystal

Design, synthesis and characterization of a linear hydrogen bonded homologous series exhibiting reentrant smectic C ordering

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