Hydrogen-bonded LC nanocomposites: characterisation of nanoparticle-LC interactions by solid-state NMR and FTIR spectroscopies

Roohnikan, Mahdi; Premack, Kayla Cummings; Guzman-Juarez, Brenda; Toader, Violeta; Rey, Alejandro D.; Reven, Linda

doi:10.1080/02678292.2018.1555723

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…Particularly, the ratio control of the two surface groups can reduce undesired interactions within NPs, which is due to the high selectivity of H-bonds. Roohnikan et al prepared a few model LC mixtures comprising trans-4-nbutylcyclohexanecarboxylic acid (4-BCHA), 4-hexylbenzoic acid (6BA) and 4,4'-bipyridine, and analyzed their molecular-level H-bond interactions with ZrO2 NPs systematically by solid-state 1 H and 13 C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopies (FT-IR) [150]. The solid-state 1H chemical shifts for the model complexes indicated that the carboxyl-pyridine linkages of 6BA to the ZrO2-pyridine NPs were stronger than the ones of 4-BCHA.…”

Section: Hydrogen-bonded Supramolecular Self-assemblies Of Inorganic mentioning

confidence: 99%

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Liu

Yang

et al. 2021

Nanomaterials

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In a liquid crystal (LC) state, specific orientations and alignments of LC molecules produce outstanding anisotropy in structure and properties, followed by diverse optoelectronic functions. Besides organic LC molecules, other nonclassical components, including inorganic nanomaterials, are capable of self-assembling into oriented supramolecular LC mesophases by non-covalent interactions. Particularly, huge differences in size, shape, structure and properties within these components gives LC supramolecules higher anisotropy and feasibility. Therefore, hydrogen bonds have been viewed as the best and the most common option for supramolecular LCs, owing to their high selectivity and directionality. In this review, we summarize the newest advances in self-assembled structure, stimulus-responsive capability and application of supramolecular hydrogen-bonded LC nanosystems, to provide novel and immense potential for advancing LC technology.

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Section: Hydrogen-bonded Supramolecular Self-assemblies Of Inorganic mentioning

confidence: 99%

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Liu

Yang

et al. 2021

Nanomaterials

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“…Solid-state NMR has been used extensively to characterize nanoparticle–ligand interactions. − Recently, several novel solution-state NMR methods have been used to gain information on these kinds of interactions as well. ,− Comprehensive multiphase (CMP) NMR, on the other hand, is the only method that can simultaneously probe solid, liquid, and gel-like phases in an intact sample . A CMP-NMR probe contains the ability to handle the high RF power required for solid-state NMR, as well as a lock, pulse field gradient, and susceptibility matching required for both solution and gel-state NMR.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Multiphase NMR Examination of Amino Acids Binding to the Dynamic Shell of Polystyrene Nanoparticles to Understand Environmental Hazards Associated with Nanoscale Plastic

Biswas

Soong

Schmidig

et al. 2022

ACS Appl. Nano Mater.

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Plastic pollution is a growing environmental concern. In addition to posing hazards to wildlife, micro- and nano-scale plastic particles can adsorb toxic small molecules from polluted waterways, which may be released when these plastic particles are ingested by animals or humans. Previous NMR studies have examined the binding between surface-modified polystyrene nanoparticles and amino acids as models for small molecules with a variety of functional groups. These previous studies, however, could only examine the liquid phase and therefore focused on the small molecules. In the current study, we use comprehensive multiphase NMR (CMP-NMR) to examine both the small molecules and polystyrene nanoparticles in all phases including liquid, solid, and gel-like phases. Through proton spectral editing techniques and 13C solid-state NMR experiments, we find that the polystyrene nanoparticles contain both solid and gel-like fractions. The bound amino acid exists primarily in the gel-like phase, with very little amino acid existing in the true solid phase. This suggests that the bound amino acid interacts with the nanoparticle shell rather than the solid-like core. These experiments relied on the ability of CMP-NMR to separately observe the solid, liquid, and gel-like phases of the same sample and demonstrate the complementary nature of this approach for understanding complex multiphase systems.

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“…Here, ethylene oxide oligomers and polymers with structures shown in Figure 3 and functionalized gold nanoparticles were dispersed in a BPLC mixture based on the mesogenic acid heterodimers, n-hexylbenzoic acid (6BA) and n- trans -butylcyclohexanecarboxylic acid (4-BCHA) with the chiral dopant (R)-2-octyl 4-[4-(hexyloxy)benzoyloxy]benzoate [ 23 ]. This particular BP mixture was chosen due to its relatively low and wide temperature range since thiol functionalized gold NPs will decompose at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Polymer Functionalized Nanoparticles in Blue Phase LC: Effect of Particle Shape

et al. 2021

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Ethylene oxide oligomers and polymers, free and tethered to gold nanoparticles, were dispersed in blue phase liquid crystals (BPLC). Gold nanospheres (AuNPs) and nanorods (AuNRs) were functionalized with thiolated ethylene oxide ligands with molecular weights ranging from 200 to 5000 g/mol. The BPLC mixture (ΔTBP ~6 °C) was based on the mesogenic acid heterodimers, n-hexylbenzoic acid (6BA) and n-trans-butylcyclohexylcarboxylic acid (4-BCHA) with the chiral dopant (R)-2-octyl 4-[4-(hexyloxy)benzoyloxy]benzoate. The lowest molecular weight oligomer lowered and widened the BP range but adding AuNPs functionalized with the same ligand had little effect. Higher concentrations or molecular weights of the ligands, free or tethered to the AuNPs, completely destabilized the BP. Mini-AuNRs functionalized with the same ligands lowered and widened the BP temperature range with longer mini-AuNRs having a larger effect. In contrast to the AuNPs, the mini-AuNRs with the higher molecular weight ligands widened rather than destabilized the BP, though the lowest MW ligand yielded the largest BP range, (ΔTBP > 13 °C). The different effects on the BP may be due to the AuNPs accumulating at singular defect sites whereas the mini-AuNRs, with diameters smaller than that of the disclination lines, can more efficiently fill in the BP defects.

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Hydrogen-bonded LC nanocomposites: characterisation of nanoparticle-LC interactions by solid-state NMR and FTIR spectroscopies

Cited by 5 publications

References 23 publications

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Comprehensive Multiphase NMR Examination of Amino Acids Binding to the Dynamic Shell of Polystyrene Nanoparticles to Understand Environmental Hazards Associated with Nanoscale Plastic

Polymer Functionalized Nanoparticles in Blue Phase LC: Effect of Particle Shape

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