Mehdi Ardjmand

Bio: Mehdi Ardjmand is an academic researcher from Islamic Azad University. The author has contributed to research in topics: Adsorption & Biodiesel. The author has an hindex of 19, co-authored 109 publications receiving 2216 citations. Previous affiliations of Mehdi Ardjmand include Islamic Azad University South Tehran Branch.

Lignocellulosic biomass to bioethanol, a comprehensive review with a focus on pretreatment

Abstract: Pretreatment technologies are aimed to increase enzyme accessibility to biomass and yields of fermentable sugars. In general, pretreatment methods fall into four different categories including physical, chemical, physico-chemical, and biological. This paper comprehensively reviews the lignocellulosic wastes to bioethanol process with a focus on pretreatment methods, their mechanisms, advantages and disadvantages as well as the combinations of different pretreatment technologies. Moreover, the new advances in plant “omics” and genetic engineering approaches to increase cellulose composition, reduce cellulose crystallinity, produce hydrolases and protein modules disrupting plant cell wall substrates, and modify lignin structure in plants have also been expansively presented.

The effect of nanosilica on the physical properties of oil well cement

Abstract: In this research, the performance of nanoscale SiO 2 in cement mortars was experimentally studied. The experimental results illustrate that the SiO 2 nanostructure, which was mixed with the cement mortars was highly beneficial in improving the rheological properties of drilling cement slurry, concurrently producing an increase in the compressive and flexural strengths of the cement mortar. In addition, there was no free water found in the designed slurries using nanosilica. Results indicated that by using this nanosilica, the setting time and the length of the dormant period were decreased. Also, studying the porosity of cements designed using nanosilica showed a decrease in cement porosity as the amount of nanosilica was increased in the investigated slurries. Moreover, cements designed by using these silica nanostructures had the lowest permeability among all examined ones, which were designed utilizing other methods.

The Design and Analysis of Experiments

Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

Lignocellulosic biomass: a sustainable platform for the production of bio-based chemicals and polymers

Abstract: The demand for petroleum dependent chemicals and materials has been increasing despite the dwindling of their fossil resources. As the dead-end of petroleum based industry has started to appear, today's modern society has to implement alternative energy and valuable chemical resources immediately. Owing to the importance of lignocellulosic biomass being the most abundant and bio-renewable biomass on earth, this critical review provides insights into the potential of lignocellulosic biomass as an alternative platform to fossil resources. In this context, over 200 value-added compounds, which can be derived from lignocellulosic biomass by various treatment methods, are presented with their references. Lignocellulosic biomass based polymers and their commercial importance are also reported mainly in the frame of these compounds. This review article aims to draw the map of lignocellulosic biomass derived chemicals and their synthetic polymers, and to reveal the scope of this map in today's modern chemical and polymer industry.

Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Abstract: With increasing environmental and ecological concerns due to the use of petroleum-based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability, and abundance. In this review, we present nanocellulose-based materials from sourcing, synthesis, and surface modification of nanocellulose, to materials formation and applications. Nanocellulose can be sourced from biomass, plants, or bacteria, relying on fairly simple, scalable, and efficient isolation techniques. Mechanical, chemical, and enzymatic treatments, or a combination of these, can be used to extract nanocellulose from natural sources. The properties of nanocellulose are dependent on the source, the isolation technique, and potential subsequent surface transformations. Nanocellulose surface modification techniques are typically used to introduce e...