Hydrogel based controlled release formulations: Designing considerations‚ characterization techniques and applications. Abstract Hydrogels have evolved over the last decade as materials of choice in varied biomedical applications. This is associated with the inherent biocompatible nature of the hydrogels. The modulation of the properties of the hydrogels is easily possible due to the availability of polymers of varied chemistry and physical properties. This review discusses the pharmaceutical
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Natural dyes are dyes or colorants derived from plants‚ invertebrates‚a or minerals. The majority of natural dyes are vegetable dyes from plant sources – roots‚ berries‚ bark‚ leaves‚ and wood — and other organic sources such as fungi and lichens. Archaeologists have found evidence of textile dyeing dating back to the Neolithic period. In China‚ dyeing with plants‚ barks and insects has been traced back more than 5‚000 years.[1] The essential process of dyeing changed little over time. Typically
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Harnessing Light Solar energy for a low carbon future www.rsc.org Registered Charity Number 207890 Harnessing Light Solar energy for a low carbon future ‘‘Solar energy is the only energy source that is essentially pollution free and distributed across the planet.’’ Climate change‚ energy security‚ and a looming energy gap are all driving research and development into clean‚ renewable energy supplies. Scientists and engineers are looking at how to harness sunlight to help meet society’s demands
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Available online at www.sciencedirect.com Polyhydroxyalkanoates: bioplastics with a green agenda Tajalli Keshavarz and Ipsita Roy Production of polyhydroxyalkanoates (PHAs) has been investigated for more than eighty years but recently a number of factors including increase in the price of crude oil and public awareness of the environmental issues have become a notable driving force for extended research on biopolymers. The versatility of PHAs has made them good candidates for the study
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CHAPTER I INTRODUCTION Background of the Study The term “air pollution” is used to describe substance that are artificially introduced into the air. Air pollutions stems from gases and airborne particles which‚ in excess‚ are harmful to human health‚ buildings and ecosystems. This pollution also affects the environment. Like there are many causes for this pollution‚ there are various side effects of the same on the environment and living beings in it. Some of the biggest effects on the environment
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Table of Contents 1. Introduction 1 2. LITERATURE REVIEW 3 2.1 BIOFUELS 3 2.2 Bio-Oil Production 3 2.2.1 Bio-Oils production by Fast Pyrolysis 4 2.2.2 Bio-Oils by Liquefaction of bio-mass 6 2.3 Vegetable oil 7 2.4 Drawback of bio oil 9 2.4.1 Hydrodeoxygenation 9 2.4.2 Catalytic cracking 10 2.5 Mechanism of Catalytic Cracking 11 2.6 Kinetic and modeling for catalytic cracking 14 3. Characterization and Analysis techniques 15 3.1 catalyst characterization methods 15 3
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Seminar Report On “Introduction to Nanotubes and Nanotube Membranes” (Vivek Pramanick) (04BCH026) Guide (Ms. A. V. Patel) Chemical Engineering Department Institute of Technology Nirma University of Science and Technology Ahmedabad – 382 481 Certificate This is to certify that Mr. Vivek K Pramanick ‚ Roll No. 04BCH026‚ of B. Tech. Sem. VI has successfully completed the report of seminar on “Introduction to Nanotubes and Nanotube membranes”. Date: 17th April‚ 2007 Guide:
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1. INTRODUCTION A solar cell is a device that converts the energy of sunlight directly into electricity by the photovoltaic effect. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight‚ while the term photovoltaic cell is used when the light source is unspecified.”Photovoltaics” the field of technology and research related to the application of solar cells in producing electricity for practical use.
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ARTICLE Received 26 Jul 2013 | Accepted 13 Nov 2013 | Published 20 Dec 2013 DOI: 10.1038/ncomms3920 Development of an ultra-thin film comprised of a graphene membrane and carbon nanotube vein support Xiaoyang Lin1‚2‚ Peng Liu1‚2‚ Yang Wei1‚2‚ Qunqing Li1‚2‚ Jiaping Wang1‚2‚ Yang Wu1‚2‚ Chen Feng1‚2‚ Lina Zhang1‚2‚ Shoushan Fan1‚2 & Kaili Jiang1‚2 Graphene‚ exhibiting superior mechanical‚ thermal‚ optical and electronic properties‚ has attracted great interest. Considering it being one-atom-thick
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eXPRESS Polymer Letters Vol.3‚ No.6 (2009) 366–375 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2009.46 Starch-based completely biodegradable polymer materials D. R. Lu‚ C. M. Xiao*‚ S. J. Xu College of Material Science and Engineering of Huaqiao University‚ Quanzhou‚ 362021‚ P. R. China Received 21 February 2009; accepted in revised form 30 March 2009 Abstract. Starch is a natural polymer which possesses many unique properties and some shortcoming simultaneously
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