The dynamic behavior of tetrapropylammonium (TPA) cations in the clear precursor sols for silicalite synthesis has been investigated by 1H diffusion ordered spectroscopy (DOSY), T1, T2, and T1ρ 1H relaxation, as well as 1H→13C cross polarization (CP) nuclear magnetic resonance. The DOSY NMR experiments showed the presence of strong solute–solvent interactions in concentrated sols, which are decreasing upon dilution. Similarities in dependence of diffusion coefficients with fractional power of the viscosity constant observed for nanoparticles, TPA cations and water led to the conclusion that they aggregate as anisotropic silicate-TPA particles. Relaxation studies as well as 1H→13C CP experiments provide information on dynamic properties of ethanol, water and TPA cations, which are function of silicate aggregates. The general tendency showed that the presence of silicate as oligomers and particles decreases the relaxation times, in particular T2 and T1ρH, as a consequence of involvement of these latter in ion-pairing interactions with water-solvated TPA molecules slowing down their mobility. Furthermore, from the 1H→13C CP dynamics curve profiles a change in the CP transfer regime was observed from fast (TCH << T1ρH) for solutions without silicates to moderate (TCH~T1ρH) when silicates are interacting with the TPA cations that may reflect the occlusion of TPA into flexible silicate hydrate aggregates.
from #Medicine via ola Kala on Inoreader http://ift.tt/1Y21AQw
via IFTTT
Αρχειοθήκη ιστολογίου
-
►
2023
(138)
- ► Φεβρουαρίου (74)
- ► Ιανουαρίου (64)
-
►
2022
(849)
- ► Δεκεμβρίου (61)
- ► Σεπτεμβρίου (74)
- ► Φεβρουαρίου (65)
-
►
2021
(2936)
- ► Δεκεμβρίου (59)
- ► Σεπτεμβρίου (180)
- ► Φεβρουαρίου (325)
-
►
2020
(1624)
- ► Δεκεμβρίου (293)
- ► Σεπτεμβρίου (234)
- ► Φεβρουαρίου (28)
-
►
2019
(13362)
- ► Δεκεμβρίου (19)
- ► Σεπτεμβρίου (54)
- ► Φεβρουαρίου (5586)
- ► Ιανουαρίου (5696)
-
►
2018
(66471)
- ► Δεκεμβρίου (5242)
- ► Σεπτεμβρίου (5478)
- ► Φεβρουαρίου (4835)
- ► Ιανουαρίου (5592)
-
►
2017
(44259)
- ► Δεκεμβρίου (5110)
- ► Σεπτεμβρίου (5105)
-
▼
2016
(7467)
- ► Δεκεμβρίου (514)
- ► Σεπτεμβρίου (1038)
-
▼
Ιουνίου
(946)
-
▼
Ιουν 01
(56)
- A tennis lesson: sharp practice in the science beh...
- Evaluation of low-level laser therapy on skeletal ...
- Acute effects of low-level laser therapy irradiati...
- Low level laser therapy associated with a strength...
- Improved Butanol–Methanol (BUME) Method by Replaci...
- Role of Environmental Factors on Resuming Valued A...
- Molecular Imaging of Small Animals
- Imaging in Nuclear Medicine
- Erratum: “Coverage-based treatment planning to acc...
- Guidelines by the AAPM and GEC-ESTRO on the use of...
- A concept for classification of optimal breathing ...
- Conformal image-guided microbeam radiation therapy...
- Quantitative IR microscopy and spectromics open th...
- Effect of photodynamic therapy for the treatment o...
- Front Cover: In situ non-destructive measurement o...
- Contents: J. Biophotonics 6/2016
- Issue Information: J. Biophotonics 6/2016
- Back Cover: Observation of an improved healing pro...
- Effectiveness of Gotu Kola Extract 750 mg and 1000...
- Looking for New Herbal Treatments for Metabolic Sy...
- Antibiotic resistance and virulence: Understanding...
- Developmental Psychobiology: Volume 58, Number 5, ...
- Issue Information
- Ten-day empirical sequential or concomitant therap...
- How to predict difficult laparoscopic cholecystect...
- Changes in fat-soluble vitamin levels after gastre...
- Predicting individual survival after hepatectomy f...
- Development of new fatty liver, or resolution of e...
- Acute severe ulcerative colitis - Evidence-based c...
- Seroepidemiological survey of hepatitis B virus in...
- Outcomes of oesophageal atresia and tracheo-oesoph...
- The effect of deworming on tests of tuberculosis i...
- Gastric GISTs: Analysis of c-Kit, PDGFRA and BRAF ...
- Evaluation of a Modified Italian European Prospect...
- Systematic use of isolated pancreatic anastomosis ...
- The prognostic nutritional index is a predictive i...
- Chemogenetic approach to model hypofrontality
- Inflammasome activation by cell volume regulation ...
- Sexual arousal and rhythmic synchronization: A pos...
- Coatings, Vol. 6, Pages 22: Thermal Protection of ...
- Molecules, Vol. 21, Pages 715: Sorbicillinoids fro...
- Nutrients, Vol. 8, Pages 326: The Relationship bet...
- Nutrients, Vol. 8, Pages 320: Does Metabolically H...
- Molecules, Vol. 21, Pages 717: Simultaneous Determ...
- Nanomaterials, Vol. 6, Pages 102: Fluorescent Nano...
- JMSE, Vol. 4, Pages 39: Gene Transcript Profiling ...
- Inorganics, Vol. 4, Pages 18: Tetrapropylammonium ...
- Toxins, Vol. 8, Pages 169: Sequence Variability in...
- Vaccines, Vol. 4, Pages 21: Aeromonas hydrophila O...
- Water, Vol. 8, Pages 236: Evaluation of Water Effi...
- Toxins, Vol. 8, Pages 169: Sequence Variability in...
- Molecules, Vol. 21, Pages 714: Hydrazino-methoxy-1...
- JFMK, Vol. 1, Pages 249-253: A Newborn with Arteri...
- Molecules, Vol. 21, Pages 707: Synthesis and Chara...
- Factors associated with fetal shunt dislodgement i...
- Effects of Type 1 Insulin-Like Growth Factor Recep...
-
▼
Ιουν 01
(56)
- ► Φεβρουαρίου (793)
Αναζήτηση αυτού του ιστολογίου
Τετάρτη 1 Ιουνίου 2016
Inorganics, Vol. 4, Pages 18: Tetrapropylammonium Occlusion in Nanoaggregates of Precursor of Silicalite-1 Zeolite Studied by 1H and 13C NMR
Εγγραφή σε:
Σχόλια ανάρτησης (Atom)
-
Αλέξανδρος Γ. Σφακιανάκης Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,0030693260717...
-
heory of COVID-19 pathogenesis Publication date: November 2020Source: Medical Hypotheses, Volume 144Author(s): Yuichiro J. Suzuki ScienceD...
-
Alimentary Pharmacology &Therapeutics, EarlyView. https://ift.tt/2qECBIJ
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου
Σημείωση: Μόνο ένα μέλος αυτού του ιστολογίου μπορεί να αναρτήσει σχόλιο.