Physicochemical properties of cellulose nanocrystals treated by photo‐initiated chemical vapour deposition (PICVD)

Javanbakht, Taraneh; Raphael, Wendell; Tavares, Jason Robert

doi:10.1002/cjce.22473

Cited by 19 publications

(19 citation statements)

References 21 publications

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“…In five of these papers, CA is only an inlet parameter in a model or a numerical simulation. The twelve remaining involve experimental measurements, all of which were performed with an optical goniometer or derived instruments . The latter enables analysis at a liquid/liquid/solid or a liquid/gas/solid interface instead of a gas/liquid/solid one (Figure ).…”

Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: Contact angles

et al. 2019

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The contact angle (CA) formed at equilibrium at the three‐phase line of contact between a liquid, a solid, and a gas may be expressed as a function of both the interfacial and surface tensions. Young first derived this thermodynamic relationship in 1805. In practice, multiple CA values are observed due to kinetic phenomena induced by evaporation, vapour adsorption, or swelling, and thermodynamic ones induced by roughness and surface chemical heterogeneities, even at molecular‐scale. These non‐ideal conditions result into an hysteresis, i.e., a difference between wetting and dewetting behaviours, and Young's equation rarely applies. Three measuring methods stand out for their applicability and reliability. In the sessile drop method, a syringe deposits a liquid drop on a flat surface and the contact angle is measured through optical means based on the drop shape. In the Wilhelmy balance method, the force required to immerse a solid plate in a bath of liquid is indirectly related to the contact angle. In the Washburn capillary rise method, the contact angle is derived from the rate at which a liquid rises by capillarity through a packed bed of powder. Employing probe liquids of various polarities, the free surface energy of the solid may be estimated. Over the last two years, ∼8600 published articles mentioned “contact angle” in their topic. Their main focus was either to develop the fundamental understanding of wetting science, or to assess the success of surface modification methods for the production of novel surfaces, composites, and membranes with enhanced wetting, adhesive, and filtration properties.

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Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: Contact angles

et al. 2019

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“…published in 2016 and 2017. We identified and collated keywords that represent physical and physicochemical properties (pressure, temperature, time), instruments and derived properties (XRD, XPS, viscosity, pH), mathematical methods (CFD, tomography), and statistical tests, and experimental design like response surface methodologies . To illustrate relationships between the network data, we generated bibliometric maps with the VOSViewer software tool .…”

Section: Introductionmentioning

confidence: 99%

“…Eng. publishes work covering a broad range of topics and classifies articles into 9 categories: (1) transport phenomena, fluid dynamics, and thermodynamics; (2) new materials, nanomaterials, and nanotechnology; (3) process control, systems engineering, and statistics; (4) reaction engineering, chemical kinetics, and catalysis (5) interfacial and electrochemical phenomena; (6) biotechnology, biochemical, and biomedical; (7) environment, renewable resources, and green processes; (8) separation processes; and (9) industrial processes. The Web of Science database has dedicated categories for some of these like thermodyanmics, materials, environment, statistics, bitotechnology, and biomedical engineering, which we share with other engineering fields and sciences.…”

Section: Introductionmentioning

confidence: 99%

Experimental methods in chemical engineering: Preface

Patience

2018

Can J Chem Eng

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Chemical engineering research encompasses a plethora of subjects ranging from nanoscale to climate change, from medicine to hazardous waste management, and from electronics and photonics to process intensification, manufacturing, and modelling. The 2017 AIChE meeting included 8000 oral presentations and posters with all these diverse topics. Here we identify experimental methods and instrumentation that straddle these subjects based on Can. J. Chem. Eng. articles published from 2016–2017. Temperature, pH, pressure, and flow rate are the physical properties most researchers report. We identified over 50 experimental techniques, reactor types, and modelling methodologies and show that articles with an experimental focus are more strongly linked than those that concentrate on hydrodynamic modelling and numerical simulation. Spectroscopy dominates instrumental techniques to characterize solids and catalyst properties and we classify 36 instruments according to what property they measure and the scale, nature of the phase, composition, and morphology. A bibliometric analysis grouped the physicochemical properties into three major research clusters centered around solid properties, liquid phase properties, and gas phase and aqueous phase properties. Articles in this special series describe the basic principles of one experimental method or instrument that appears frequently in the journal. Together with a short background, the articles highlight fields of application, assess the sources of error, detection thresholds, and uncertainty. This series provides chemical engineers with a concise, accessible reference guide to help identify and choose appropriate experimental techniques and instruments.

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“…47 We thus expect treated beads to remain stable in suspension without additives, thus enabling automated detection after container swirling over extended periods. Radical polymerization of syngas initiated by UVC radiation has already been tested on copper, 48 polypropylene and polyethylene terephthalate 49 , nanocrystalline cellulose 50 , superparamagnetic iron oxide nanoparticles 51 and metal oxide nanoparticles 52 substrates with success.…”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

Labonté

Marion

Virgilio

2016

Ind. Eng. Chem. Res.

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Container challenge sets, used in the qualification and validation of automated visible particle inspection systems in the parenteral drug industry, are prepared by seeding a single standardized polystyrene-divinylbenzene (PS-DVB) bead inside the commercial product to mimic foreign particulates. Due to its low surface energy and wettability, the bead adheres to container walls, hindering its detection by the motion based inspection system. The aim of this research is to modify the surface properties of the bead in such a way that it repulses the inner walls and stays in suspension inside the liquid product. The surface treatment consists of a photoinduced chemical vapor deposition (PICVD) process using syngas and UVC light. Following 2 treatment, newly grafted C-OH, C-O-C, C=O and COOH functional groups on the bead's surface are observed by XPS and FTIR spectroscopy, leading to an increase in the surface energy from 31 ± 1 to 65 ± 2 mJ/m 2 , and a corresponding zeta potential decrease from -38 mV to -61 mV.Finally, treated 100 µm, 200 µm and 500 µm PS-DVB beads suspended in water exhibit higher dispersion stability over time than untreated beads. These results show the potential of syngas PICVD to provide an effective solution to the stability issue of containers challenge sets for the validation of automated particle inspection systems, enabling significant savings of time and money to the parenteral drug industry.

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Physicochemical properties of cellulose nanocrystals treated by photo‐initiated chemical vapour deposition (PICVD)

Cited by 19 publications

References 21 publications

Experimental methods in chemical engineering: Contact angles

Experimental methods in chemical engineering: Contact angles

Experimental methods in chemical engineering: Preface

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

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