Investigation of thermodynamic properties of 4-decyloxybiphenyl-4′-carboxylic acid liquid crystal and preparation of polymer dispersed liquid crystal composite

Öztürk, Emine; Ocak, Hale; Çakar, Fatih; Karanlık, Gürkan; Cankurtaran, Özlem; Bilgin‐Eran, Belkız

doi:10.1016/j.molliq.2018.05.080

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Öztürk and co-workers synthesized 4-decyloxybiphenyl-4′-carboxylic acid (DBCA) and reduced the transition temperatures of precursors of PDLC films. The other occurs when carboxyl monomers can polymerize and exert a huge impact on the microstructure and electro-optical performance of PDLCs . The existing study proved that the content of carboxyl monomer affects electro-optical properties, which is attributed to the existence of hydrogen bonds, leading to changes in the arrangement of molecules.…”

Section: Introductionmentioning

confidence: 99%

“…The other occurs when carboxyl monomers can polymerize and exert a huge impact on the microstructure and electro-optical performance of PDLCs. 54 The existing study proved that the content of carboxyl monomer affects electro-optical properties, which is attributed to the existence of hydrogen bonds, leading to changes in the arrangement of molecules. As a result, during the photopolymerization, the free radical reaction is affected considerably by the molecular arrangement, and the morphology of polymer networks is changed.…”

Section: Introductionmentioning

confidence: 99%

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A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Ma,

Zhang,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Smart windows with synergetic light modulation have heightened demands for applications in smart cars and novel buildings. However, improving the on-demand energy-saving efficiency is quite challenging due to the difficulty of modulating sunlight with a broad bandwidth in an energy-saving way. Herein, a smart window with switchable near-infrared light transmittance and passive radiative cooling is prepared via a monomer design strategy and photoinduced polymerization. The effects of hydrogen bonds and fluorine groups in acrylate monomers on the electro-optical properties as well as microstructures of polymer-dispersed liquid crystal films have been systematically studied. Some films show a high contrast ratio of 90.4 or a low threshold voltage (V th ) of 2.0 V, which can be roll-to-roll processed in a large area. Besides, the film has a superior indoor temperature regulation ability due to its passive radiative cooling and controllable near-infrared light transmittance properties. Its radiative cooling efficiency is calculated to be 142.69 W/m 2 and NIR transmittance could be switched to below 10%. The introduction of a carboxylic monomer and fluorinated monomer into the system endows the film with a highly efficient temperature management capability. The film has great potential for applications in fields such as flexible smart windows, camouflage materials, and so on.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Ma,

Zhang,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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“…Normally dynamics properties were tested by physical or chemical methods [ 17 , 19 , 20 , 21 ]. In recent decades, inverse gas-liquid chromatography (IGC) has become a powerful method to evaluate the properties of various materials [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties Investigation of Process Volatile Organic Compounds (VOCs) and Its Transport Impact Factor in Oil Sands Management

et al. 2021

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This paper presents a new approach for the determination of volatile organic compounds (VOCs) characteristics and their migration influencing factors in oil sands management processes and reveals the relationship between different asphaltene content and different solvents. Specifically, thermodynamic (i.e., partitioning coefficients, Kr, specific retention volume, Vg, the activity coefficients, γ and enthalpy of solution, ΔH0) and their impact factors are discussed. Gas-liquid chromatography (GLC) experimental measurements were used as the test data. A range of solvents (nC5, iC5, nC6, nC7, and Toluene) has been tested in different asphalt contents (0, 2.56, 9.93, 36.86, 53.67 wt%). There are temperatures in the range of 333.2–393.2 K (with 10 K increase) were conducted, respectively. The dynamics properties of asphalt mixture are calculated, and the relation between dynamics properties of asphalt mixture and absolute temperature, asphalt content and solvent type is discussed. The results show that within the acceptable error range, partitioning coefficients, Kr, specific retention volume, Vg, and enthalpy of solution, ΔH0 and other thermodynamic properties have a good tendency to predict, they decrease with the increase in asphaltene content and temperature and increase with the increase in solute carbon number.

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“…Different properties LCs' are needed for diverse applications areas. For these reasons, the required enhanced properties of liquid crystals are obtained by synthesizing a new liquid crystals [8,9] and/or a mixture of two or more different liquid crystals [10][11][12] and/or using polymer [13][14][15], nanoparticles [16][17][18][19] and dyes [20,21] and/or using at least two of them to reveal their LC behavior [22][23][24]. Among all of them, NPs are very important to obtain liquid crystals having different physical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

2018

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Hexylcyanobiphenyl liquid crystal was doped with graphene oxide at ratios %0.25GO, %0.5GO, %1GO and %2GO, and the change in physical properties of pristine and the doped liquid crystals has been investigated. The phase transitions of prepared samples were studied by differential scanning calorimeter and polarized optical microscopy. The differential scanning calorimeter and polarized optical microscopy results are in good agreement when examining the nematic-isotropic liquid phase transition temperatures of the hexylcyanobiphenyl. The liquid crystal texture images obtained with polarized optical microscopy reveals that thermal stability of sample changed with graphene oxide concentration, i.e., increased with graphene oxide concentration. Impedance, capacitance, conductivity and real and imaginary dielectric constants of the pure and doped liquid crystals were obtained depending on frequency and voltage at the room temperature by using impedance analyzer. These electrical properties of the pure and the graphene oxide-doped samples showed an increase with increasing the graphene oxide ratio. The voltage-dependent light transmittance experiment revealed that threshold voltage of LC cells decreased for %0.25GO-and % 1GO-dispersed samples, but it was increased at %0.5GO-and %2GO-dispersed samples.

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Investigation of thermodynamic properties of 4-decyloxybiphenyl-4′-carboxylic acid liquid crystal and preparation of polymer dispersed liquid crystal composite

Cited by 12 publications

References 26 publications

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Thermodynamic Properties Investigation of Process Volatile Organic Compounds (VOCs) and Its Transport Impact Factor in Oil Sands Management

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

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