Characterization of a hydrogen bonded liquid crystal homologous series: Detailed FTIR studies in various mesophases

Prabu, N. Pongali Sathya; Vijayakumar, V. N.; Mohan, M. L. N. Madhu

doi:10.1016/j.molstruc.2011.03.056

Cited by 40 publications

(6 citation statements)

References 19 publications

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“…This method was used to analyze infrared spectra for various materials (Vijayakumar and Madhu Mohan 2009;Pongali Sathya Prabu et al 2011). Figure 3 shows the FTIR spectra of ABS/10PNP, ABS/15PNP, and ABS/20PNP.…”

Section: Ftir Characteristicsmentioning

confidence: 99%

Properties of Oil Palm Empty Fruit Bunch-Filled Recycled Acrylonitrile Butadiene Styrene Composites: Effect of Shapes and Filler Loadings with Random Orientation

Nikmatin¹,

Syafiuddin²,

Irwanto³

2016

BioResources

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Exploration of natural resources as composite fillers is still under intensive investigation. Previous works mention that nano-size natural fillers provide an alternative solution to improve certain composite properties compared with macro-and micro-size nanofibers. This work prepared biocomposites formulated from recycled acrylonitrile butadiene styrene (ABS) reinforced by nano powders or long fibers of oil palm empty fruit bunch (OPEFB). Composite properties in terms of density, Fourier transform infrared spectroscopy, surface morphology, melt flow rate, tensile strength, impact strength, and hardness were studied. The density of all composites generally increased with increasing filler loading. Composites with nano powder fillers had lesser voids than those composites with the long fiber. Melt flow rate of all composites fluctuated with filler loadings. Increasing filler loadings for composites with long fiber increased brittleness. By contrast, composites with nano powder fillers were more elastic at the higher filler loading. It was confirmed that impact and hardness properties of the composites with nano powder fillers increased with increasing filler loading. Moreover, composites with long fiber fillers decreased their impact and hardness properties with filler loadings increase.

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Section: Ftir Characteristicsmentioning

confidence: 99%

Properties of Oil Palm Empty Fruit Bunch-Filled Recycled Acrylonitrile Butadiene Styrene Composites: Effect of Shapes and Filler Loadings with Random Orientation

Nikmatin¹,

Syafiuddin²,

Irwanto³

2016

BioResources

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“…A variety of techniques can be employed for liquid crystal characterization, including small-angle x-ray scattering (SAXS) (Freiberger and Glatter 2006; Goujon et al 2015; Mendez and Hammouda 2013) and Fourier Transform Infrared Spectroscopy (FTIR) (Koenig et al 1995; Pongali Sathya Prabu et al 2011), amongst others, and for an exhaustive analysis of the different techniques used, the reader is referred to the review by An and colleagues (An et al 2016). In light of the previously published methodology we used to prepare our liquid crystals, we chose scanning electron microscopy (SEM) as a simple and robust approach to liquid crystal characterization.…”

Section: Resultsmentioning

confidence: 99%

Liquid crystal delivery of ciprofloxacin to treat infections of the female reproductive tract

Pisano

Giustiniani

Francis

et al. 2019

Biomed Microdevices

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Infections of the female reproductive tract are a major cause of morbidity and mortality in humans, requiring significant investment to sustain treatment and representing a major challenge to health. The increasing prevalence of bacterial resistance, and an almost complete absence of new antibiotic therapies for the past five decades, mean there is a desperate need for novel approaches to the treatment of bacterial infections. Within the present study, we demonstrate the effective ex vivo treatment of bacterial infection of the female reproductive tract using a controlled-release, liquid crystal-based platform. Liquid crystal encapsulation of ciprofloxacin significantly enhanced its bactericidal efficacy and reduced cell toxicity. Liquid crystal structures are low-cost, simple to manufacture and provide a sustained-release profile of encapsulated ciprofloxacin. Treatment of Escherichia coli infected reproductive tract epithelial cells and whole organ cultures with liquid crystal encapsulated ciprofloxacin proved to be an effective strategy for reducing bacterial load and reproductive tract inflammatory responses to infection. These data suggest that such an approach could provide an efficacious treatment modality for enhancing the effectiveness of current antibiotic therapies. Electronic supplementary material The online version of this article (10.1007/s10544-019-0385-x) contains supplementary material, which is available to authorized users.

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“…The formation of photosensitive supramolecular hydrogen-bonded liquid crystals (SMHBLCs) through intermolecular hydrogen bonding (H-bonding) interactions occupies a wide area of interests [11][12][13][14][15][16][17][18][19]. Various types of SMHBLCs, as single-bonded [20,21], double-bonded [22,23] and multiple-bonded [24,25] complexes have been investigated and reported.…”

Section: Introductionmentioning

confidence: 99%

Nematic Phase Induced from Symmetrical Supramolecular H-Bonded Systems Based on Flexible Acid Core

Ahmed

Khushaim

2020

Crystals

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New symmetrical 1:2 supramolecular H-bonded liquid crystals (SMHBLCs) interactions, A/2Bn, were formed between adipic acid and 4-(4′–pyridylazophenyl) 4″-alkoxybenzoates. Optical and mesomorphic behaviors of the prepared SMHBLC complexes were investigated using differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). FT-IR spectroscopy was carried out to confirm the H-bond interactions of the prepared complexes via Fermi bands formation. Their photo-physical properties were investigated by UV-spectroscopy and the observed absorbance values were found to be mainly dependent on the length of the terminal alkoxy chain. Mesomorphic behaviour for all A/2Bn complexes revealed that all complexes are dimorphic-exhibiting enantiotropic mesophases with induced nematic phases, except for the long chain terminal complex which exhibits only a monomorphic smectic A phase. In order to investigate the effect of mesogenic core geometry on the mesophase properties, a comparison was established between the mesomeric behaviors of the present complexes and previously reported rigid core acid complexes. Finally, the XRD pattern confirmed the POM and DSC results.

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Characterization of a hydrogen bonded liquid crystal homologous series: Detailed FTIR studies in various mesophases

Cited by 40 publications

References 19 publications

Properties of Oil Palm Empty Fruit Bunch-Filled Recycled Acrylonitrile Butadiene Styrene Composites: Effect of Shapes and Filler Loadings with Random Orientation

Properties of Oil Palm Empty Fruit Bunch-Filled Recycled Acrylonitrile Butadiene Styrene Composites: Effect of Shapes and Filler Loadings with Random Orientation

Liquid crystal delivery of ciprofloxacin to treat infections of the female reproductive tract

Nematic Phase Induced from Symmetrical Supramolecular H-Bonded Systems Based on Flexible Acid Core

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