Chemical Engineering

Sorption of carbamazepine by commercial graphene oxides: A comparative study with granular activated carbon and multiwalled carbon nanotubes
Graphene nanosheet materials represent a potentially new high surface area sorbent for the treatment of endocrine disrupting compounds (EDCs) in water. However, sorption behavior has been reported only for laboratory graphene prepared by a laborious and hazardous graphite exfoliation process. A careful examination of commercially available, clean, high-volume produced graphene materials should ...


Microfluidic fabrication and permeation behaviors of uniform zwitterionic hydrogel microparticles and shells
This study introduces a flexible and straightforward method for generating monodisperse complex hydrogel microparticles. For this, a water-in-oil emulsion was generated in a microcapillary device and then the emulsion drops were photo-polymerized to transfer them to hydrogel particles. The hydrogel microparticles were made of poly (2-methacryloyloxyethyl phosphorylcholine) that has an enhanced ...
Physical adsorption of anisotropic titania nanoparticles onto poly(2-vinylpyridine) latex and characterisation of the resulting nanocomposite particles
Four poly(2-vinylpyridine) latexes with intensity-average mean diameters ranging between 246 and 955nm were prepared by aqueous emulsion polymerisation. These latexes were characterised by transmission electron microscopy, field emission scanning electron microscopy, dynamic light scattering, aqueous electrophoresis, disc centrifuge photosedimentometry and thermogravimetry. The adsorption of ri...


Strings of polymer microspheres stabilized by oxidized carbon nanotubes
Oxidized carbon nanotubes (CNTOs) with hydrophilic oxygen-containing functional groups and hydrophobic conjugated structure are prepared by the oxidation of carbon nanotubes (CNTs). After the polymerization of styrene with CNTOs dispersed in aqueous phase, polystyrene (PS) microspheres with string-like structure are obtained. Thermogravimetic analysis (TGA), differential scanning calorimeter (D...
Influence of molecular hydrogen on acetylene pyrolysis: Experiment and modeling
The effect of molecular hydrogen on the formation of molecular carbonaceous species important for soot formation is studied through a combination of shock-tube experiments with high-repetition-rate time-of-flight mass spectrometry and detailed chemistry modeling. The experiment allows to simultaneously measure the concentration–time profiles for various species with a time resolution of 10μs...


Regioselective Nitration of Phenols in O/W Microemulsion by NaNO3 and Dilute Sulfuric Acid
Highly regiospecific mononitration of phenol by NaNO3 and dilute sulfuric acid was carried out in a TX100 oil-in-water microemulsion. Effects of various parameters such as acid type, surfactant concentration, water content, and alcohol have been investigated. The use of inexpensive and relatively nontoxic acidic reagent is an advantage of this method. >
Evaluation of Pomegranate (Punica Granatum L.) Pulps for the Removal of Copper(II) Ions: Kinetic, Equilibrium, and Desorption Studies
Pomegranate pulp has been used as novel adsorbent for removing Cu(II) ions from aqueous solution. The optimum conditions for removal of Cu(II) ions were found to be pH 5.32, biosorbent dose 0.1 g, contact time 120 minutes, initial concentration 50 mg/L, and temperature 30°C. The kinetic data were well fitted to the pseudo-second-order model. The biosorption process agreed with the Langmuir i...

Flame dynamics and unsteady heat release rate of self-excited azimuthal modes in an annular combustor
This paper presents an experimental study into the structure and dynamics of the phase-averaged heat release rate during self-excited spinning and standing azimuthal modes in an annular combustion chamber. The flame response was characterised using two methods: high-speed OH∗ chemiluminescence imaged above the annulus to investigate the structure of the phase-averaged fluctuations in heat rel...
Large eddy simulations and rotational CARS/PIV/PLIF measurements of a lean premixed low swirl stabilized flame
This paper reports on numerical and experimental studies of a lean premixed low swirl stabilized methane/air flame. The burner is made up of a central perforated plate and an annular swirler. A premixed methane/air mixture at an equivalence ratio of 0.62 is injected to an ambient co-flow of air through the burner under atmospheric pressure and room temperature condition with a Reynolds number o...

Plasma sheath behavior and ionic wind effect in electric field modified flames
Plasma sheath theory is applied to understand the plasma behavior in electric field modified flames. This paper presents a set of 1D plasma sheath equations with approximated analytical solutions to calculate the sheath thickness for given applied voltages and plasma properties. The results show that the anode sheath is ten of microns thick, less than 1V, and largely independent of the applied ...
Melt dispersion mechanism for fast reaction of aluminum nano- and micron-scale particles: Flame propagation and SEM studies
Flame propagation studies for Al nanoparticles (80nm) and micron particles (3–4.5μm) mixed with MoO3 in both an open and confined burn setup were examined. A scanning electron microscopy (SEM) analysis of the reactants and products reveals quantitative size data that contributes toward an understanding of the governing reaction mechanisms. For the confined burn tube experiments, nanoscaled r...

Numerical analysis of nanoaluminum combustion in steam
The comprehensive analysis of chain mechanism development in the Al–H2O system is performed on the base of novel reaction mechanism taking into account quantum chemistry studies of potential energy surfaces of the elementary reactions with Al-containing species and estimations of rate constants of corresponding reaction channels. As well the physical properties of Al-containing species involv...
A universal model of opposed flow combustion of solid fuel over an inert porous medium
In this study, a universal model is developed to examine the behavior of combustion wave observed in porous solid matters (e.g., smoldering, self-propagating high-temperature synthesis (SHS), diesel particulate filter (DPF) regeneration process). Analytical expressions of the combustion characters of solid combustible (e.g., diesel particulate matters trapped in a DPF) deposited over an inert p...
Strategy for PLIF single-shot HCO imaging in turbulent methane/air flames
Formyl (HCO) has since long been recognized as a common intermediate species and a potential local indicator of the major heat release in hydrocarbon combustion. Consequently, the detection of HCO is desirable especially in turbulent flames of practical relevance. However, due to the low concentration and low fluorescence quantum yield, single-shot based detection of HCO with planar laser-induc...
Initiation and formation of the corrugated structure leading to the self-turbulization of downward propagating flames in a combustion tube with external laser absorption
Combustion tube (length 45cm, inner diameter 5cm) experiments with flames of premixed gas of C2H4/CO2–O2 (Le<1) were conducted. The flame fronts propagated downward to the closed bottom of an open-ended tube. An initially steadily propagating flat flame was deformed by an external laser irradiation method to investigate its evolution under the interaction with acoustic vibration. showe...