Thermal and pressure stimulated effect on mesogenic 4-(heptyloxy)benzoic acid and gold nano rod composite systems

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-03-09 DOI:10.1016/j.molliq.2025.127354

Abhinav Lal , Ravindra Dhar

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引用次数: 0

Abstract

Nano composites of gold nano rod (GNR) with hydrogen-bonded calamitic liquid crystal (LC) compound 4-(Heptyloxy)benzoic acid is prepared for five different concentrations of GNR. Pure LC and its composites are characterized calorimetrically, texturally and spectroscopically. Pressure stimulated effects on thermal parameters like peak transition temperature (Tp), change in enthalpy of transition (ΔH) are studied. Decrease in Tp and ΔH is observed for the low concentration of GNRs, whereas these parameters have increased for composite 1 on application of pressure. Texture study confirms the uniform distribution of nano rods in the LC matrix without any sign of aggregation. Schlieren textures for different meso phases and transition between them have been recorded. A less common six-fold brush pattern is observed in Schlieren texture for one of the composites with strength of defect value S =

\pm \frac{3}{2}

. FTIR study confirms the presence of H-bond between host LC molecules to form dimers in pure and composite systems.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.