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  • Yaman Boluk
Yaman Boluk

Yaman Boluk
University of Alberta | UAlberta · Department of Civil and Environmental Engineering and the School of Mining and Petroleum Engineering

About

117
Publications
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Publications

Publications (117)
Article
Full-text available
The removal of skin cancer lesions on the nose often results in the loss of nasal cartilage. The cartilage loss is either surgically replaced with autologous cartilage or synthetic grafts. However, these replacement options come with donor-site morbidity and resorption issues. 3-dimensional (3D) bioprinting technology offers the opportunity to engi...
Article
Full-text available
Objective: The avascular inner regions of the knee menisci cannot self-heal. As a prospective treatment, functional replacements can be generated by cell-based 3D bioprinting with an appropriate cell source and biomaterial. To that end, human meniscus fibrochondrocytes (hMFC) from surgical castoffs of partial meniscectomies as well as cellulose nan...
Article
Full-text available
We investigated the gelation and microstructure of cellulose nanocrystals (CNCs) in nonionic hydroxyethyl cellulose (HEC) solutions. Cellulose nanocrystals (CNCs) with a particle length of 90 nm and width of 8 nm currently produced by acid hydrolysis of wood pulp were used in this study. The microstructures of CNCs/polymer suspensions were investig...
Article
This study examined bleeding in cement paste as affected by cellulose nanofibres prepared with varying the content of carboxyl groups that were grafted onto the fibre surface. Alongside the conventional ASTM test method, bleeding was further evaluated using a turbidity scanner. A linear correlation was obtained between the bleeding heights as found...
Article
Full-text available
Skin cancer patients often have tumorigenic lesions on their noses. Surgical resection of the lesions often results in nasal cartilage removal. Cartilage grafts taken from other anatomical sites are used for the surgical reconstruction of the nasal cartilage, but donor-site morbidity is a common problem. Autologous tissue-engineered nasal cartilage...
Article
Full-text available
We investigated the gelation of cellulose nanocrystals (CNCs) in polyelectrolyte and neutral polymer solutions. Cellulose nanocrystals (CNCs) with half-ester sulfate groups produced by acid hydrolysis of wood pulp were used in this study. The microstructure of CNCs/polymer suspensions was investigated in semidilute concentration regimes by selectin...
Article
Full-text available
Organic coatings are commonly used for protection of substrate surfaces like metals and wood. In most cases they fulfil their purpose by acting as a barrier against unwanted substances such as oxygen, water or corrosive ions. However, with time coatings fail due to degradation caused by chemical reactions or wear by wind, water, impact of solid par...
Article
In the current study, we focused on the preparation of nanocomposite films of natural rubber latex-cellulose nanocrystals (NR/CNCs) and investigated the release of CNCs from those materials into aqueous solutions. The obtained nanocomposite films were well characterized for further understanding of the release mechanism; as the intermolecular inter...
Article
Cellular concrete is a lightweight solid cementitious foam that is used mainly for thermal insulation and sound absorption. Either partially or wholly, when the Portland cement in the binder is replaced with ash, the environmental impact of the material is reduced. However, the resulting changes in the cell structure and their subsequent impact upo...
Article
Cellulose nanocrystals (CNCs) with high specific surface area, crystallinity, aspect ratio with unique rod-like shapes, elastic modulus and tensile strength are an excellent additive which can be used for the preparation of unique polymer/nanoparticle fiber composites from polymer solutions by electrospinning. Research on electrospinning as a techn...
Article
This study pioneers the use of cellulose nanofibers (CNF) as a means to restricting the chloride-ion ingress in cement based systems. Three CNF variants, differing in their carboxylate content from 0.13 to 1.13 mmol/g of the nanofiber, were introduced to paste and mortar mixtures alike, at up to 1.2% by volume fraction of the dry nanofibre. The ref...
Article
A water dispersible surface-enhanced Raman scattering (SERS) substrate is developed to provide rapid and reproducible measurement of solution-borne analytes. Cellulose nanomaterials are generally dispersible in water and are known to act as a reducing agent and support for the synthesis of metal nanoparticles. In this work, cellulose nanofibers (CN...
Article
We are reporting the preparation of cellulose nanocrystal (CNC) particles stabilized Pickering hempseed oil-in-water emulsions and using them as feedstocks for the preparation of oil powders without using any other hydrophilic carrier agent. Oil powders were prepared in a spray drier by rapid evaporation of water. The effect of the ratio of HSO to...
Article
A water-in-air Pickering emulsion, also called dry water, was produced with hydrophobic nanosilica, which was then employed in this study to examine its possible benefit upon the alkali-activation of metakaolin-based geopolymers. The dry water was produced to contain a nanosilica fraction varying from 10 to 20%. The results show that the presence o...
Article
Nitrobenzene (CNC‐1), trifluoromethyl benzene (CNC‐2) modified and polystyrene‐grafted (CNC‐g) cellulose nanocrystals in polystyrene (PS)‐N,N dimethylformamide (DMF) solutions were electrospun and collected as stretched and aligned fibers on a rotating drum. Scanning electron microscope pictures showed significant alignment in the case of unmodifie...
Article
A semi-dilute cellulose nanocrystal suspension was tested for pressure, volume, temperature dependencies of its viscosity and density. The compression of a 2.0 wt% cellulose nanocrystal suspension under 5.0 MPa at room temperature resulted in morphological changes from istotropic to nematic form. However, at high temperature, high pressure treatmen...
Article
Full-text available
Calcium hydroxide is used in diverse applications including heritage conservation where supplying it in the form of nanoparticles allows easy carbonation with atmospheric air contacts. The effects of cellulose nanofibers on the precipitation of calcium hydroxide nanoparticles were investigated by varying the reaction time, concentration, and carbox...
Article
Full-text available
Cellulose nanocrystals (CNCs) are inherently hydrophilic; even so, their dispersions in water based applications such as rheology modifiers, coatings, and emulsion systems do not often produce perfect dispersions with a minimum energy input. Supplying the CNCs in dry granular powder form is needed in the industrial scale of production because of it...
Article
Spray drying is the most cost-efficient technology to produce bulk quantities of dry cellulose nanocrystals (CNCs) from acid hydrolyzed CNCs suspensions. Spray drying results in aggregation of CNCs particles in granular material which is difficult to re-disperse in water to individual particles. Here we investigated co-spray drying of CNCs suspensi...
Article
This study characterizes a Portland cement based cellular system prepared with a preformed foam. Wood ash, locally sourced from pulp and paper mills, was first characterized and later, blended at up to 20% of the binder. The resulting mixtures were cast at three densities between 1000 and 1400 kg/m³ and examined for mechanical, thermal and acoustic...
Article
Full-text available
Nanocomposite coatings are of great interest as barrier coatings since synergy effects between matrix and additive properties can be achieved. This, however, requires favorable additive-matrix interactions to provide a strong interphase (interface region). In this work we elucidate the properties of two environmentally benign nanocomposite coatings...
Article
TEMPO-oxidized cellulose nanofibers (TOCNFs) were prepared and investigated as low-cost adsorbents for the removal of Cu (II) and Zn (II) from synthetic and natural waters. The adsorption equilibrium was reached within 2 min and adsorption capacity was as high as 102.9 mg g⁻¹ for Cu (II) and 73.9 mg g⁻¹ for Zn (II). Ionic strength showed adverse ef...
Article
This study investigates the use of pretreatment and enzymatic hydrolysis side streams and conversion to lignocellulose nanofibers. We used a steam-exploded and partial enzymatic hydrolyzed hardwood pulp and an organosolv pretreated softwood pulp to prepare lignocellulose nanofibers (LCNF) via microfluidization. The energies applied on fibrillation...
Article
Cellulose nanofibres (CNF) are employed for the first time to address sulphate penetration and subsequent dimensional change in the cementitious system. Using four different Portland cement based binders, paste and mortar mixtures were prepared to have up to 0.5% dry CNF by volume fraction. After 28 days of moist curing, the specimens were subjecte...
Article
Full-text available
Extrusion-based additive manufacturing (EBAM) or 3D printing is used to produce customized prototyped parts. The majority of the polymers used with EBAM show moisture sensitivity. However, moisture effects become more pronounced in polymers used for critical applications, such as biomedical stents, sensors, and actuators. The effects of moisture on...
Article
The interest in functionalized cellulose nanocrystals (CNCs) for multiple biomedical application has been increasing in recent years. CNCs are suitable to functionalization with an array of polymers, generating chemically related nanomaterials with different morphologies, surface charges that can affect bioreactivity, including immune response. In...
Article
Shape memory materials are an innovative type of materials that reversibly store a temporary shape and recover back to the original dimensions with the application of an external mechanism such as heat. Shape memory polymers (SMP), specifically thermoplastic SMP (e.g. shape memory polyurethane (SMPU)) have received much attention during the past de...
Article
Hardwood bleached chemi-thermomechanical pulp (BCTMP) was converted to cellulose nanofibers by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) catalyzed oxidization along with mechanical defibrillation process. The TEMPO reaction was evaluated based on the delignification, carboxylate content of cellulose and the yield of the insoluble component. Cell...
Article
This article characterizes a cellular system prepared from alkali activated Class C fly ash mixed with a preformed foam. The resulting mixture was cast at three densities between 1000 and 1400 kg/m³ and all tests were conducted under ambient drying conditions resulting in densities between 940 and 1310 kg/m³. A phase analysis of the components in t...
Article
Full-text available
This paper examines the crack growth resistance of alkali-activated fly ash concrete under extreme temperatures. Plain and hybrid fibre reinforced alkali activated concrete prepared with fly ash were subjected to a range of temperatures from − 30 to 300 °C, sustained for 2 h. The alkali activation was effected with a blend of sodium hydroxide and s...
Article
This study investigated the electrospinning of polystyrene solutions using added unmodified and modified (with grafted nitrobenzene and trifluoromethyl benzene functionalities and polystyrene brushes) cellulose nanocrystals (CNCs). A strong correlation existed between the formation of beads on the fibers and the degree of dispersion of CNC particle...
Article
The filtration characteristics of drilling fluids were evaluated by dynamic filtration under cross flow geometry. Crossflow (tangential flow) filtration by using a rotating cylinder geometry occurs when the mud is being circulated radially by inner rotating cylinder and permeates tangentially through the outer wall filter media. Dynamic filtration...
Article
In this study, a sulfur-free softwood lignin (SFSL) was electrospun to form bead-free fibers. The fibers were evaluated as potential precursors for carbon fiber production. Higher heating rates of thermo-stabilization caused afused fiber morphology. The lignin purification process also affected the quality of the SFSL-based carbon fibers. Therefore...
Article
The thermal conductivity and specific heat capacity of paste and concrete prepared with alkali-activated fly ash were investigated. Along with a reference plain concrete mix, two other mixes were reinforced with a blend of steel and polypropylene fibres to examine the role of fibre reinforcement on the thermal constants. The mixtures were exposed t...
Data
1H NMR of cationic monomer APMA. Abbreviation: APMA, poly(N-3-aminopropyl)methacrylamide; 1H NMR, proton nuclear magnetic resonance.
Data
13C NMR data of cationic monomer APMA. Abbreviation: APMA, poly(N-3-aminopropyl)methacrylamide; 13C NMR, carbon nuclear magnetic resonance.
Data
FT-IR of freeze-dried sample of CNCs-β-CD showing peak expansion of key peaks. Note: Green line: unmodified CNCs, red line: CNCs-poly(APMA), blue line: CNCs-β-CD. Abbreviations: CNCs, cellulose nanocrystals; CNCs-β-CD, CNCs grafted with β-cyclodextrin; FT-IR, Fourier transform infrared spectroscopy.
Article
Full-text available
Ambar S Jimenez,1 Francesca Jaramillo,1 Usha D Hemraz,2 Yaman Boluk,3 Karina Ckless,1 Rajesh Sunasee1 1Department of Chemistry, State University of New York at Plattsburgh, Plattsburgh, NY, USA; 2National Research Council, Montreal, QC, Canada, 3Department of Civil & Environmental Engineering, University of Alberta and National Institute for Nanote...
Article
Electrospun keratin nanofiber fabricated with non-toxic solvents and crosslinking reagents are promising scaffolds for tissue engineering applications. Keratin from chicken feathers was solubilized in aqueous alkaline conditions and electrospun using aqueous poly(vinyl alcohol)(PVA)/citric acid solution as electrospinning polymer aid. Keratin/PVA n...
Article
This paper presents a feasibility study on the effects of forest based ash (FBA) on the mechanical performance of concrete. Four such samples were obtained from the pulp and paper industry as the residual byproduct of their hog fuel. They were analyzed for grain size distribution, density, morphology, and oxide content. Subsequently, the ash was em...
Article
The fracture of high molecular weight poly(ethylene oxide) (PEO) chains under extensional stretching during the electrospinning of aqueous solutions was investigated by measuring solution viscosities and monitoring the change of molecular weight. The degree of macromolecular chain fractures in 1.0% polymer solutions increased with the increase in m...
Article
In this short review, we discuss the colloidal microstructure of sulfonated cellulose nanocrystal (CNC) suspensions and connect to their rheological behavior in the presence of electrolyte, by changing its surface chemistry and also in dilute water soluble polymer solutions. Presence of electrolyte has a significant effect depending both on the con...
Article
Full-text available
Physical structures of aqueous cellulose nanocrystal (CNC) suspensions in anionic polyelectrolyte carboxymethyl cellulose (CMC) and non-ionic poly(ethylene oxide) (PEO) were investigated by studying their cross polarized, polarized optical microscope (POM) images and dynamic light scattering, zeta potential, ¹H spin–lattice relaxation nuclear magne...
Article
Full-text available
Guar gum (GG) fracturing fluids were studied by incorporating cellulose nanofibrils (CNFs) in anhydrous borax crosslinked guar gum gels. To fully understand the impact of CNF on the proppant suspension capability of developed fracturing fluids, their shear rate-dependent viscosity and viscoelasticity were investigated. The shear rate dependencies o...
Article
Full-text available
Portland cement concrete (PCC) is now second only to potable water in per capita consumption. And notwithstanding its numerous benefits, Portland cement itself is responsible for between 4 to 5% of the world’s manmade greenhouse gas emissions. In this context, geopolymer concrete is a promising alternative, wherein the Portland cement binder is rep...
Article
This paper describes approaches to evaluating the resistance of cement-based composites to sulphate attack. The conventional approach of evaluation by means of measuring expansion is discussed in comparison with the sulphate diffusion, which was quantified as a function of depth. Besides CSA Types GU and HS, a 30:70 blend of fly ash and cement Type...
Article
Non-Newtonian flow behaviours of dilute and semi-dilute carboxymethyl cellulose (CMC) solutions in the presence of spindle shaped cellulose nanocrystal particles (CNC) were investigated. Scanning transmission electron microscopy, dynamic light scattering, polarized optical microscopy, and turbidity measurements of CNC suspensions in CMC solutions w...
Article
The effects of polyethylene oxide (PEO) molecular weight (Mv), and volume fraction ( ) on the morphology of electrospun sulfur free softwood lignin nanofibers were investigated. Small amounts of PEO were used during preparations of the solutions to aid the electrospinning process. It was found that tripling the PEO volume fraction resulted in a tra...
Article
Electrospinning of sulfur-free softwood lignin (SFSL) in N,N-dimethylformamide (DMF) is reported as is and with poly(ethylene oxide) (PEO). SFSL macromolecules behave as rigid spheres, instead of free draining macromolecules in DMF. Hence they are investigated as colloids. Colloidal SFSL generates uniform fibers only at the volume fraction of 0.63....
Article
Inverse gas chromatography (IGC) was used to study the effect of humidity on the permeability of selected low molecular weight alcohols (methanol, ethanol, propanol, and butanol) through films made up of a hydrophilic polymer hydroxypropyl xylan (HPX). The thin films used consisted of a neat HPX film and a HPX film with sorbitol, a commonly used fo...
Article
Full-text available
Crystalline cellulose nanocrystals (CNCs) have emerged as novel materials for a wide variety of important applications such as nanofillers, nanocomposites, surface coatings, regenerative medicine and potential drug delivery. CNCs have a needle-like structure with sizes in the range of 100-200. nm long and 5-20. nm wide and a mean aspect ratio 10-10...
Article
Inverse gas chromatography (IGC) was used to study the permeability of a series of aromas through neat hydroxypropyl xylan (HPX) film and HPX films containing sorbitol, a commonly used food grade plasticizer, and cellulose nanocrystal (CNC), a nanosized filler. The aroma used included methanol, ethanol, propanol, and butanol. Also, their solubility...
Article
Aggregation of bacteria and their initial adhesion to silica surfaces are affected greatly by solution chemistry, particularly pH and ionic strength (IS). The effects of pH and IS on the aggregation and deposition of Escherichia coli K12 on silica surfaces were investigated in NaCl solutions at variable pH and IS, and in the absence and presence of...
Article
The development of nonwoven meshes based on cellulose acetate (CA) reinforced by cellulose nanocrystals (CNC) is reported. The meshes were electrospun from 15 wt% CA (Mn = 30,000) in dimethylacetamide/acetone (1:2, w/w) solutions with various concentrations of CNC dispersions. The investigated six levels of CNC dispersions in CA solutions were: 0,...
Article
Full-text available
Purpose Our aim was to investigate the predictive factors indicating strangulation, and the requirement for surgery in patients with acute mechanical intestinal obstruction due to adhesions. Methods This study retrospectively evaluated the records of patients with adhesive acute mechanical intestinal obstruction. The surgical treatment (group S),...
Article
Cellulose nanocrystals (CNCs) have emerged as a new class of renewable material for various applications due to their remarkable properties and commercialization prospect. The relative low density, expected low cost, non-toxic character, uniform nanosize distribution, high aspect ratios, high surface area, thermal properties and high modulus of ela...
Article
A method to characterize the length (L) of rod-like cellulose nanocrystal (CNC) particles is described. It is based on dynamic light scattering (DLS) and electron microscopy. Measurement of translational diffusion coefficient from DLS along with diameter measurements from electron microscopy is used in Broersma translational diffusion coefficient e...
Article
Cellulose nanocrystals (CNCs) continue to gain increasing attention in the materials community as sustainable nanoparticles with unique chemical and mechanical properties. Their nanoscale dimensions, biocompatibility, biodegradability, large surface area and low toxicity make them promising materials for biomedical applications. Here, we disclose a...
Article
Full-text available
Deposition on silica surfaces of two Pseudomonas fluorescens strains (CHA0 and CHA19-WS) having different extracellular polymeric substance (EPS) producing capacities, was studied in the absence and presence of cellulose nanocrystals (CNC). Batch (batch soaking) and continuous flow (quartz crystal microbalance with dissipation) methods were used to...
Article
Inverse gas chromatography (IGC) was used to measure the infinite dilution diffusion coefficients of water in hydroxypropyl xylan (HPX) films containing sorbitol, a commonly used plasticizer, and cellulose nanocrystals (CNC) at temperatures above their glass transition temperatures (Tg). HPX forms transparent but relatively rigid films and has the...
Article
Full-text available
Unique rheological and phase behaviors of rod-like nanocrystalline cellulose (NCC) suspensions in aqueous media are revealed in the present article. Specifically, the NCC aqueous suspension remained isotropic in a wide NCC concentration range in which the suspension underwent transition from dilute solution to gel, and the relative viscosity of the...