A5020419503- Advanced Cellulose Research Studies
- Membrane Separation Technologies
- Graphene research and applications
- Fuel Cells and Related Materials
- Catalysis for Biomass Conversion
- Membrane Separation and Gas Transport
- Polysaccharides and Plant Cell Walls
- Molecular Junctions and Nanostructures
- Nanocomposite Films for Food Packaging
- Membrane-based Ion Separation Techniques
- Surface Chemistry and Catalysis
- Lignin and Wood Chemistry
- biodegradable polymer synthesis and properties
- Supercapacitor Materials and Fabrication
- Covalent Organic Framework Applications
- Chemical Synthesis and Characterization
- Nanomaterials for catalytic reactions
- Aerogels and thermal insulation
- Asymmetric Hydrogenation and Catalysis
- Radioactive element chemistry and processing
- Catalysis and Hydrodesulfurization Studies
- Radiopharmaceutical Chemistry and Applications
- Conducting polymers and applications
- Pickering emulsions and particle stabilization
- Mesoporous Materials and Catalysis
KU Leuven
2016-2025
University College West Flanders
2021-2023
JK Research (United States)
2014-2021
Institute of Chemical Engineering
2020
University of Nottingham
2010-2013
This review takes an in-depth look at the chemical modifications that have been carried out on nanocrystalline cellulose.
Cellulose nanocrystals were converted into ratiometric pH-sensing nanoparticles by dual fluorescent labelling employing a facile one-pot procedure. A simple and versatile three-step procedure was also demonstrated extending the number of fluorophores available for grafting. In this method an amine group introduced via esterification followed thiol-ene click reaction.
An imidazolium salt was grafted to cellulose nanocrystals (also called nanowhiskers) using copper(I) catalysed azide–alkyne cycloaddition and the bromide anion successfully exchanged for bistriflimide an anionic dye, providing opportunity synthesize a wide variety of ion exchange systems or catalysts as support medium.
By using an oriented electric field in a scanning tunneling microscope, one can locally control the condensation of boronic acids at liquid/solid interface. The phase transition between self-assembled molecular networks and covalent organic frameworks is controlled by changing polarity applied bias. electric-field-induced transformation reversible under ambient conditions.
Cellulose nanocrystals were grafted with imidazole functionalities (DS 0.06) producing a CO<sub>2</sub>-responsive flocculant for microalgal biomass. The resulting induced flocculation of <italic>Chlorella vulgaris</italic> up to 90% efficiency.
The chemical patterning of graphene is being pursued tenaciously due to exciting possibilities in electronics, catalysis, sensing, and photonics. Despite the intense efforts, spatially controlled, multifunctional covalent has not been achieved. lack control originates from inherently poor reactivity basal plane graphene, which necessitates use harsh chemistries. Here, we demonstrate resolved multicomponent single layer using a facile efficient method. Three different functional groups could...
Pyridinium-grafted-cellulose nanocrystals were prepared by a simple one-pot reaction using 4-(1-bromoethyl/bromomethyl)benzoic acid, pyridine and cellulose (CNCs). The grafting consists of an esterification between acid CNCs nucleophilic attack on the C–Br bond pyridine. This simplifies existing cationization methods, which leads to higher density while retaining CNC crystallinity.
Ferrocene-decorated cellulose nanowhiskers were prepared by the grafting of ethynylferrocene onto azide functionalized cotton-derived using azide–alkyne cycloaddition. Successful surface modification and retention crystalline morphology nanocrystals was confirmed elemental analysis, inductively coupled plasma-atomic emission spectroscopy, X-ray photoelectron diffraction. The coverage with ferrocenyl is high (approximately 1.14 × 10–3 mol g–1 or 4.6 1013 cm–2 corresponding to a specific area...
The interaction of bovine serum albumin (BSA) with sulfated, carboxylated, and pyridinium-grafted cellulose nanocrystals (CNCs) was studied as a function the degree substitution by determining adsorption isotherm directly measuring thermodynamics interaction. BSA onto positively charged followed Langmuirian maximum amount adsorbed protein increasing linearly substitution. binding mechanism between pyridinum-grafted found to be endothermic based on charge neutralization. A positive entropy...
An approach for nanoscale covalent functionalization of graphite surfaces employing self-assembled molecular monolayers n-alkanes as templating masks is presented. Linearly aligned aryl groups with a lateral periodicity 5 or 7 nm are demonstrated utilizing templates different lengths. The key feature this the use phase separated solution double layer consisting thin organic containing template molecules topped by an aqueous aryldiazonium capable electrochemical reduction to generate radicals...
The self-assembly behavior of CNCs from cellulose II is different than I, despite having similar shape, surface charge density and a right-handed twist. Longer pitch chiral nematic liquid crystals formed but over much longer time periods.
Controlled covalent functionalization of MoS<sub>2</sub> by chemical reduction.
The drive to expand the implementation of membrane separation technology towards harsher environments prompted development chemically robust epoxide-based TFC membranes. This work delves into formation poly(epoxyether) (PEE) thin films via interfacial initiation polymerization (IIP) and an additional cross-linking step (XL-PEE) on top porous support layers, seeking better understand influence performance properties. A systematic study was conducted using a series supports with pore sizes...
Single layered metal–organic coordination networks (MOCNs) are gaining attention thanks to their unique electronic and magnetic properties. The presence of coordinatively unsaturated metal sites within structures provides additional binding locations for substrates in catalytic processes. Consequently, MOCNs fabricated on solid surfaces emerging as promising candidates use solution-based heterogeneous applications. bottom-up synthesis such surface-supported requires a rigorous design by...
Sulfuric acid hydrolysis of native cellulose fibers results in colloidally stable suspensions nanocrystals (CNCs). We have investigated the effect source on suspension properties CNCs extracted from cotton and wood sources using a comparable preparation strategy. The structural were revealed to be similar within given standard deviation prevalent polydispersity, whereas other such as liquid crystalline phase behavior, viscosity, diffusion coefficients, surface tension found differ...
Flocculation could offer a low-cost and straightforward solution to harvest microalgae in an economic energy-efficient way. Cationically modified cellulose nanocrystals (CNCs) have been proposed as alternative biopolymer-based flocculants such chitosan. The aim of this study was fine-tune the cationic modification CNCs for use harvesting freshwater Chlorella vulgaris. were functionalized with two groups, pyridinium (PYR) or methylimidazolium (MIM), degree substitution (DS) varied by...
A convenient covalent functionalization approach and nanopatterning method of graphite graphene is developed. In contrast to expectations, electrochemically activated dediazotization a mixture two aryl diazonium compounds in aqueous media leads spatially inhomogeneous graphitic surfaces, creating covalently modified surfaces with quasi-uniform spaced islands pristine or graphene, coined nanocorrals. Cyclic voltammetry chronoamperometry approaches are compared. The average diameter (45-130...
A straightforward protocol for monolayer covalent functionalization of graphite using self-limiting diazonium chemistry is presented.
Gas-phase acylation is an attractive and sustainable method for modifying the surface properties of cellulosics. However, little known concerning regioselectivity chemistry, i.e., which cellulose hydroxyls are preferentially acylated if can be restricted to surface, preserving crystallinities/morphologies. Consequently, we reexplore simple gas-phase acetylation modern-day cellulosic building blocks - nanocrystals, pulps, dry-jet wet spun (regenerated cellulose) fibres a nanocellulose-based...
The thermodynamics of interactions between cations the second group periodic table and differently negatively charged cellulose nanocrystals was investigated using isothermal titration calorimetry (ITC). interaction with CNCs found to be endothermic driven by an increase in entropy upon adsorption ions, due degrees freedom gained surface bound water ion adsorption. effect pH-dependent, showing enthalpy for suspensions at near-neutral pH (6.5) when compared acidic (2). Sulfated nanoparticles...
Covalently modified carbon surfaces remain central to a number of applications. Surface modification is often achieved using aryldiazonium chemistry, which has become the gold standard for functionalization carbon-based surfaces. However, higher reactivity and thus lower stability diazonium precursors at interfaces have prompted search alternative chemistries. Diaryliodonium salts emerged as stable alternatives conventional precursors. In this contribution, we provide detailed comparison...