Investigation of phosphonic acid surface modifications on zinc oxide nanoparticles under ambient conditions

Quiñones, Rosalynn; Rodriguez, Kate; Iuliucci, Robbie J.

doi:10.1016/j.tsf.2014.06.057

Cited by 36 publications

(55 citation statements)

References 66 publications

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“…In the spectrum of ODPA_CPPA_NbO (Figure 3c), a new adsorption band that was assignable to the σ (C=O) mode of the CPPA moiety was observed at 1700 cm −1 [66], indicating the presence of the CPPA moiety in ODPA_CPPA_NbO. It was reported that an adsorption band due to the ν as (CH 2 ) of alkyl chain was shifted from 2924.7 cm −1 to a lower wavenumber by increasing the packing density of the alkyl chain [67]. In the case of the all-trans octadecyl alkyl chain, ν as (CH 2 ) was observed at 2917.8 cm −1 [67,68] and a σ s (CH 2 ) band was observed at 1468 cm −1 [68].…”

Section: Discussionmentioning

confidence: 88%

“…It was reported that an adsorption band due to the ν as (CH 2 ) of alkyl chain was shifted from 2924.7 cm −1 to a lower wavenumber by increasing the packing density of the alkyl chain [67]. In the case of the all-trans octadecyl alkyl chain, ν as (CH 2 ) was observed at 2917.8 cm −1 [67,68] and a σ s (CH 2 ) band was observed at 1468 cm −1 [68]. In the spectrum of ODPA_NbO, adsorption bands assignable to ν as (CH 2 ) and ν s (CH 2 ) modes were observed at 2918 and 2848 cm −1 , respectively, and a σ s (CH 2 ) adsorption band was observed at 1468 cm −1 .…”

Section: Discussionmentioning

confidence: 99%

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Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

Suzuki¹,

Sudo²,

Hirano³

et al. 2019

Functional Materials

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Inorganic Janus nanosheets were successfully prepared using the difference in reactivity between interlayers I and II of layered hexaniobate K 4 Nb6O 17 ·3H 2 O. Janus nanosheets exhibit the highest anisotropy among Janus compounds due to their morphology. It is therefore important to prepare Janus nanosheets with stable shapes in various solvents, robust chemical bonds between nanosheets and fuctional groups and high versatility due to surface functional groups. K 4 Nb 6 O 17 ·3H 2 O, which possesses two types of interlayers and two types of organophosphonic acids that react with metal oxides to form robust covalent bonds, was employed to prepare Janus nanosheets for this study. Interlayer I was modified by octadecylphosphonic acid, followed by modification by carboxypropylphosphonic acid mainly at interlayer II. Preparation of Janus nanosheets with two organophosphonate moieties was confirmed by 31 P MAS NMR. After these regioselective and sequential modifications, the products were exfoliated into single-layered nanosheets in THF. Two types of derivatives with different repeating distances were recovered from a dispersion containing nanosheets exfoliated by different processes, centrifugation, and solvent evaporation. AFM analysis of the exfoliated nanosheets revealed that the products were Janus compounds. There are high expectations for application of these types of Janus nanosheets in various fields and for design of various Janus nanosheets using this preparation method.There are various methods of preparing Janus nanoparticles. Regioselective surface modification of nanoparticles can produce Janus nanoparticles [11]. By forming nanoparticles with two raw materials, Janus nanoparticles with different compositions can be prepared [2]. Self-assembly and subsequent cross-linking of polymer chains can also produce Janus nanoparticles [12]. Janus rods can be prepared by forming silica using TEOS by the sol-gel method on Fe 3 O 4 regioselectively [13]. Janus cylinders can be prepared by masking one side of a cylinder and conducting subsequent modification of the other side [14].Janus nanosheets exhibit the highest anisotropy among Janus compounds due to their unique morphology. They are also useful as emulsifiers, because Janus nanosheets cannot rotate at the interfaces of micelles [15]. Most Janus nanosheets reported so far have consisted of polymers. Stupp et al. reported the preparation of Janus nanosheets by polymerization of oligomers with polymerizable groups [16]. Polymerization of oligomers led to the formation of sheet morphology, because the polymerizable groups were located at the center of an oligomer. Walther et al. used triblock copolymers, polystyrene-block-polybutadiene-block-poly(tert-butyl methacrylate), for preparing Janus nanosheets [17]. Janus nanosheets were prepared by cross-linking polybutadiene domains of the triblock copolymers, and the resulting Janus nanosheets had two types of surfaces, polystyrene, and poly(tertbutyl methacrylate) moieties. These methods are based on selective polym...

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

Suzuki¹,

Sudo²,

Hirano³

et al. 2019

Functional Materials

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“…Quiñones et al [117] reported the surface modification of ZnO NPs with phosphonic functional head groups. Various phosphonic acids with slight variation in chain lengths and polarities were explored: octadecylphosphonic acid (ODPA), 16-phosphonohexadecanoic acid (COOH-PA), and (12-phosphonododecyl) phosphonic acid (Di-PA) (Fig.…”

Section: Organophosphorusmentioning

confidence: 99%

A review of current coupling agents for modification of metal oxide nanoparticles

Mallakpour

Madani

2015

Progress in Organic Coatings

251

116

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“…Zinc oxide (ZnO) is an indigenously fluorescent material that is of interest due to its wide range of conductivity and its applications for electronic and photonic modalities. ZnO has a wide band gap energy of 3.37 eV 23 , which calculates to 375 nm as the start of emission. Due to the Stoke’s shift phenomenon, the optimal excitation wavelength of ZnO is between 325–350 nm.…”

Section: Resultsmentioning

confidence: 99%

Two-Dimensional Fluorescence Difference Spectroscopy to Characterize Nanoparticles and their Interactions

Hurst

Delong

2016

Sci Rep

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Two dimensional fluorescence difference spectroscopy (2D FDS) detects nanoparticle interactions following surface functionalization and biomolecule loading by generating a spectral signature of the fluorescent intensity per excitation and emission wavelengths. Comparing metal oxide nanoparticles revealed a unique spectral signature per material composition. 2D FDS showed to be sensitive to changes in surface properties between ZnO NPs synthesized by different methods. ZnO NP loaded with glycol chitosan, polyacrylic acid (PAA), or methoxy polyethylene glycol (mPEG) exhibited a distinct spectral signature shift. ZnO NP loaded with Torula Yeast RNA (TYRNA)(640 nm), polyinosinic: polycytidylic acid (pIC)(680 nm), or splice switching oligonucleotide (SSO)(650 nm) each revealed a shift in emission. Ras-Binding domain (RBD) at three concentrations (25, 37.5, 50 μg/mL) showed that fluorescent intensity was inversely related to the concentration of protein loaded. These data support 2D FDS as a novel technique in identifying nanoparticles and their surface interactions as a quality assurance tool.

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Investigation of phosphonic acid surface modifications on zinc oxide nanoparticles under ambient conditions

Cited by 36 publications

References 66 publications

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

A review of current coupling agents for modification of metal oxide nanoparticles

Two-Dimensional Fluorescence Difference Spectroscopy to Characterize Nanoparticles and their Interactions

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Investigation of phosphonic acid surface modifications on zinc oxide nanoparticles under ambient conditions

Cited by 36 publications

References 66 publications

Janus Nanosheets Derived from K4Nb6O17·3H2O via Regioselective Interlayer Surface Modification

Janus Nanosheets Derived from K4Nb6O17·3H2O via Regioselective Interlayer Surface Modification

A review of current coupling agents for modification of metal oxide nanoparticles

Two-Dimensional Fluorescence Difference Spectroscopy to Characterize Nanoparticles and their Interactions

Contact Info

Product

Resources

About

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification