Browsing Environmental Science by Author "Abushammala, Hatem"
Now showing items 1-20 of 23
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Acid mediated networked cellulose: preparation and characterization
Hashaikeh, Raed; Abushammala, Hatem (Elsevier, 2011)High-yield networked cellulose (NC) material was prepared by sulfuric acid dissolution of microcrystalline cellulose (MCC) and regeneration in ethanol. The dissolution was studied by varying treatment temperature and time ... -
Combining steam explosion with 1-ethyl-3-methylimidazlium acetate treatment of wood yields lignin-coated cellulose nanocrystals of high aspect ratio
Abushammala, Hatem; Goldsztayn, Ruben; Leao, Alcides; Laborie, Marie-Pierre (Springer Netherlands, 2016-07)Lignin-coated cellulose nanocrystals (CNCs) were extracted from the tropical wood Angelim Vermelho in a yield of 47 % based on wood cellulose content. The procedure combined a mild steam explosion process with a treatment ... -
Comparative assessment of methods for producing cellulose I nanocrystals from cellulosic sources
Mao, Jia; Abushammala, Hatem; Brown, Nicole; Laborie, Marie-Pierre (American Chemical Society, 2017)Current environmental concerns foster a strong interest in extracting polymers and building-blocks from lignocellulosic biomass. Among these, cellulose nanocrystals (CNCs) have raised both academic and industrial interest ... -
Current Status of Cellulosic and Nanocellulosic Materials for Oil Spill Cleanup
Fürtauer, Siegfried; Hassan, Mostafa; Elsherbiny, Ahmed; Gabal, Shaimaa A; Mehanny, Sherif; Abushammala, Hatem (Multidisciplinary Digital Publishing Institute, 2021-01)Recent developments in the application of lignocellulosic materials for oil spill removal are discussed in this review article. The types of lignocellulosic substrate material and their different chemical and physical ... -
Enzymatic hydrolysis of cellulose and the use of TiO2 nanoparticles to open up the cellulose structure
Abushammala, Hatem; Hashaikeh, R (Pergamon, 2011-10)A major barrier in the process of cellulose enzymatic hydrolysis into glucose for biofuel production is the enzyme accessibility to cellulose. In this study, a new cellulose regeneration strategy is developed to address ... -
Imidazole, a new tunable reagent for producing nanocellulose, part I: Xylan-coated CNCs and CNFs
Mao, Jia; Abushammala, Hatem; Hettegger, Hubert; ETAL.. (Multidisciplinary Digital Publishing Institute, 2017-10)Imidazole is reported to be an effective reactant for the production of nanocellulose from hardwood pulp. The morphologies and surface properties of the nanocellulose can be simply tailored according to the water content ... -
Impact of the Surface Properties of cellulose nanocrystals on the crystallization kinetics of poly (butylene succinate)
Abushammala, Hatem; Mao, Jia (Multidisciplinary Digital Publishing Institute, 2020-03)The hydrophilicity of cellulose nanocrystals (CNCs) is a major challenge for their processing with hydrophobic polymers and matrices. As a result, many surface modifications have been proposed to hydrophobize CNCs. The ... -
Ionic liquid-mediated technology to produce cellulose nanocrystals directly from wood
Abushammala, Hatem; Krossing, Ingo; Laborie, Marie-Pierre (Elsevier, 2015-09)We report for the first time the direct extraction of cellulose nanocrystals (CNCs) from wood by means of a 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) treatment. A native cellulosic product could be recovered in 44% ... -
Microcrystalline cellulose powder tableting via networked cellulose-based gel material
Abushammala, Hatem; Hashaikeh, R; Cooney, C (Elsevier, 2012-02)Networked cellulosic (NC) gel material was prepared via 70% sulfuric acid dissolution and hydrolysis of microcrystalline cellulose (MCC) followed by regeneration in cold ethanol. The material was utilized as a multifunctional ... -
Monitoring the surface aging of wood through its pits using atomic force microscopy with functionalized tips
Mao, Jia; Abushammala, Hatem; Kasal, Bohumil (Elsevier, 2021-01)Wood aging is a topic of great interest due to its impact on wood performance and durability as a construction material. Therefore, it is important to develop accurate methods to monitor aging and understand its mechanisms. ... -
Nano-Brushes of alcohols grafted onto cellulose nanocrystals for reinforcing poly (Butylene succinate): Impact of Alcohol chain length on interfacial adhesion
Abushammala, Hatem (Multidisciplinary Digital Publishing Institute, 2020-01)Despite the many interesting properties of cellulose nanocrystals (CNCs), their hydrophilicity is one of the main challenges for their processing with hydrophobic polymers and matrices. To overcome this challenge, this ... -
Networked cellulosic gel material as a pharmaceutical excipient
Abushammala, Hatem; Hashaikeh, Raed (Masdar Institute of Science and Technology, 2012)Networked cellulosic (NC) material was prepared in a gel form via sulfuric acid dissolution and hydrolysis of microcrystalline cellulose (MCC) and then regeneration in ethanol. The regenerated material was utilized ... -
On the mechanism of the unwanted acetylation of polysaccharides by 1,3-dialkylimidazolium acetate ionic liquids: part 1—analysis, acetylating agent, influence of water, and mechanistic considerations
Zweckmair, Thomas; Hettegger, Hubert; Abushammala, Hatem; Bacher, Markus; ETAL.. (Springer, 2015-09)The acetylating action of ionic liquids frequently used in biomass and polysaccharide processing, namely 1,3-dialkylimidazolium acetates, on cellulose has been studied. Analysis was based on an accurate method to quantify ... -
On the mechanism of the unwanted acetylation of polysaccharides by 1,3-dialkylimidazolium acetate ionic liquids: part 2—the impact of lignin on the kinetics of cellulose acetylation
Abushammala, Hatem; Hettegger, Hubert; Bacher, Markus; ETAL.. (Springer, 2017-10)Cellulose acetylation has been reported as a side reaction of cellulose treatment with the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) (Karatzos et al. in Cellulose 19:307–312, 2012) and other ... -
On the para/ortho reactivity of isocyanate groups during the carbamation of cellulose nanocrystals using 2, 4-toluene diisocyanate
Abushammala, Hatem (Multidisciplinary Digital Publishing Institute, 2019-09)2,4-toluene diisocyanate (TDI) has been commonly used to bind molecules and polymers onto the surface of cellulose nanocrystals (CNCs). Such a process usually involves two steps: (1) the more reactive para-isocyanates ... -
On the prevalence of side reactions during ionosolv pulping of Norway spruce with 1-butyl-3-methylimidazolium acesulfamate
Abushammala, Hatem; Winter, Heiko; Krossing, Ingo; Laborie, Marie-Pierre (Springer Netherlands, 2014-12)We report on the low efficiency of 1-butyl-3-methylimidazolium acesulfamate ([BMIM]Ace) at delignifying Norway spruce. A systematic kinetic and structural study of [BMIM]Ace pulping of spruce wood at 120 °C allowed shedding ... -
Preparation and characterization of electrospun PLA/nanocrystalline cellulose‐based composites
Pirani, Sanaa; Abushammala, Hatem; Hashaikeh, Raed (Wiley & Sons, 2013-12)Biodegradable nanocomposites of Nanocrystalline Cellulose (NCC) and electrospun poly-(lactic acid) were prepared via a new mixing technique. Dispersion of hydrophilic NCC in hydrophobic PLA was improved through aqueous ... -
A review of the surface modification of cellulose and nanocellulose using aliphatic and aromatic mono-and di-isocyanates
Abushammala, Hatem; Mao, Jia (Multidisciplinary Digital Publishing Institute, 2019-01)Nanocellulose has been subjected to a wide range of chemical modifications towards increasing its potential in certain fields of interest. These modifications either modulated the chemistry of the nanocellulose itself or ... -
A review on the partial and complete dissolution and fractionation of wood and lignocelluloses using imidazolium ionic liquids
Abushammala, Hatem; Mao, Jia (Multidisciplinary Digital Publishing Institute, 2020-01)Ionic liquids have shown great potential in the last two decades as solvents, catalysts, reaction media, additives, lubricants, and in many applications such as electrochemical systems, hydrometallurgy, chromatography, CO2 ... -
A simple method for the quantification of free isocyanates on the surface of cellulose nanocrystals upon carbamation using toluene diisocyanate
Abushammala, Hatem (Multidisciplinary Digital Publishing Institute, 2019-06)In many reports, cellulose and nanocellulose have been carbamated using 2,4-toluene diisocyanate (2,4-TDI) to allow the grafting of molecules or polymers onto their surfaces. Such a process usually involves the reaction ...