Structural Characterization of Silica and Amino-Silica Nanoparticles by Fourier Transform Infrared (FTIR) and Raman Spectroscopy

Petreanu, Irina; Niculescu, Violeta; Enache, Stanica; Iacob, Ciprian; Teodorescu, Mircea

doi:10.1080/00032719.2022.2083144

Cited by 27 publications

(15 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the positively charged amines could absorb ATO with a negative charge. 22,39 The successful modification of NH 2 -MSN with mPEG-CHO was confirmed by the asymmetrical stretching vibration and asymmetrical scissoring vibration of –CH 2 – from PEG at 2915 cm −1 and 1465 cm −1 , respectively, which indicated that mPEG had been conjugated on the surface of NH 2 -MSN successfully. 40,41 Surface attachment with ATO brought about van der Waals force and hydrophobic interactions and enabled the association of hydrocarbon chains between the external NH 2 -MSN and PEG.…”

Section: Resultsmentioning

confidence: 92%

PEG-grafted arsenic trioxide-loaded mesoporous silica nanoparticles endowed with pH-triggered delivery for liver cancer therapy

et al. 2023

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 92%

PEG-grafted arsenic trioxide-loaded mesoporous silica nanoparticles endowed with pH-triggered delivery for liver cancer therapy

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Ethylenediamine functional groups can be identified in the DRIFT spectra ( Figure 4 ) by the presence of two absorption bands of low intensity in the region of 3298 and 3378 cm −1 , characteristic of the ν s,as (NH) stretches of amino groups, while the band at 1459–1458 cm −1 refers to δ(NH 2 ). An intense absorption band at 1018–1157 cm −1 , present in the spectra of all samples, refers to the asymmetric stretches of the ν as (Si-O-Si) network [ 27 ]. Bridging silanes are represented in the silica network by ethylene and phenylene structuring elements.…”

Section: Resultsmentioning

confidence: 99%

“…Ethylenedia mine functional groups can be identified in the DRIFT spectra (Figure 4) by the presenc of two absorption bands of low intensity in the region of 3298 and 3378 cm −1 , characteristi of the νs,as(NН) stretches of amino groups, while the band at 1459-1458 cm −1 refers t δ(NН2). An intense absorption band at 1018-1157 cm −1 , present in the spectra of all sam ples, refers to the asymmetric stretches of the νas(Si-O-Si) network [27]. Bridging silane are represented in the silica network by ethylene and phenylene structuring elements Thus, the presence of -CН2units from the ethylene bridge (as well as from the alkyl frag ments of the functional groups) is manifested in the IR spectra of xerogels as a group o absorption bands in the region of 2812-2935 cm −1 , corresponding to the symmetric and asymmetric stretches of the C−Н bonds as well as bands of low intensity at ~1265 and 141 cm −1 that can be attributed to their bending vibrations.…”

Section: Properties and Behavior Of Surface Groups Of (Propyl)ethylen...mentioning

confidence: 99%

Diamine Groups on the Surface of Silica Particles as Complex-Forming Linkers for Metal Cations

et al. 2023

View full text Add to dashboard Cite

Novel spherically shaped organosilica materials with (propyl)ethylenediamine groups were obtained via a modified one-pot Stöber co-condensation method. The porosity of these materials was tuned with the controlled addition of three silica monomers acting as structuring agents (tetraethoxysilane and bridged silanes with ethylene and phenylene bridges). The morphologies and structures of the synthesized materials were studied by SEM, DRIFT spectroscopy, CHNS elemental analysis, low-temperature nitrogen adsorption–desorption, and electrokinetic potential measurements. Their sizes were in the range of 50 to 100 nm, depending on the amount of structuring silane used in the reaction. The degree of the particles’ agglomeration determined the mesoporosity of the samples. The content of the (propyl)ethylenediamine groups was directly related with the amount of functional silane used in the reaction. The zeta potential measurements indicated the presence of silanol groups in bissilane-based samples, which added new active centers on the surface and reduced the activity of the amino groups. The static sorption capacities (SSCs) of the obtained samples towards Cu(II), Ni(II), and Eu(III) ions depended on the porosity of the samples and the spatial arrangement of the ethylenediamine groups; therefore, the SSC values were not always higher for the samples with the largest number of groups. The highest SSC values achieved were 1.8 mmolCu(II)/g (for ethylene-bridged samples), 0.83 mmolNi(II)/g (for phenylene-bridged samples), and 0.55 mmolEu(III)/g (for tetraethoxysilane-based samples).

show abstract

“…However, the increase in the intensity peaks assigned to the Si─O─Si and Si─O─H stretching vibration (1045 cm −1 ) in the FT‐IR spectrum of GOxFNP@POF supported the presence of silica nanoparticles on the fiber's surface as the weak peak assigned to the N─H vibration (1639 cm −1 ) of the amino groups of both APTES and the AMPTS (Figure S4B, Supporting Information). [ 40 ] The stability of the conjugation was confirmed by calculating the amount of particles removed during the washing procedure. After the first washing step required to remove the unbonded particles, GOxFNP@POF and FNP@POF were soaked in water.…”

Section: Resultsmentioning

confidence: 99%

Lab‐on‐a‐Fiber Wearable Multi‐Sensor for Monitoring Wound Healing

Giovannini,

Sharma,

Boesel

et al. 2023

Adv Healthcare Materials

View full text Add to dashboard Cite

Chronic wounds are regarded as a silent epidemic, affecting 1–2% of the population and representing 2–4% of healthcare expenses. The current methods used to assess the wound healing process are based on the visual evaluation of physical parameters. This work aims to design a wearable non‐invasive device capable of evaluating three parameters simultaneously: the pH and the levels of glucose and matrix metalloproteinase (MMP) present in the wound exudate. The device is composed of three independent polymer optical fibers functionalized with fluorescent‐based sensing chemistries specific to the targeted analytes. Each fiber is characterized in terms of detection sensitivity and selectivity confirming their suitability for monitoring the targeted parameters in ranges relevant to the wound environment. The selectivity and robustness of the multi‐sensing device are confirmed with analyses using complex solutions with different pH levels (5, 6, and 7), different concentrations of glucose (1.25, 2.5, and 5 mm), and MMP (1.25, 2.5, and 5 µg mL−1). Given the simple set‐up, the affordability of the materials used and the possibility of detecting additional parameters relevant to wound healing, such multi‐sensing fiber‐based devices could pave the way for novel non‐invasive wearable tools enabling the assessment of wound healing from the molecular perspective.

show abstract

Structural Characterization of Silica and Amino-Silica Nanoparticles by Fourier Transform Infrared (FTIR) and Raman Spectroscopy

Cited by 27 publications

References 27 publications

PEG-grafted arsenic trioxide-loaded mesoporous silica nanoparticles endowed with pH-triggered delivery for liver cancer therapy

PEG-grafted arsenic trioxide-loaded mesoporous silica nanoparticles endowed with pH-triggered delivery for liver cancer therapy

Diamine Groups on the Surface of Silica Particles as Complex-Forming Linkers for Metal Cations

Lab‐on‐a‐Fiber Wearable Multi‐Sensor for Monitoring Wound Healing

Contact Info

Product

Resources

About