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General Chemistry 4th edition, Hill, Petrucci, McCreary, Perry. Chapter Nine. 1. Chemical Bonds. Chapter Nine. Prentice Hall © 2005 Chapter Nine Chemical Bonds Chemical Bonds A Preview Forces called chemical bonds hold atoms together in molecules and keep ions in place in solid ionic compounds Chemical bonds are electrostatic forces they reflect a balance in the forces of attraction and repulsion between electrically charged particles Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Nine Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Nine Electrostatic Attractions and Repulsions Nuclei attract electron s 3 4 Energy of Interaction Nuclei repel other nuclei Electrons repel other electrons At 74 pm attractive forces are at a maximum energy is at a minimum Hydrogen nuclei far apart just a little attraction Both attractions and repulsions occur what s the net effect Answer it depends on the distance between nuclei Chapter Nine Closer than 74 pm repulsion Continue to download »
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Nanoforum Report Nanotechnology in Agriculture and Food May 2006 Nanotechnology in Agriculture and Food A Nanoforum report available for download from www nanoforum org Tiju Joseph and Mark Morrison Institute of Nanotechnology May 2006 1 Introduction 2 1 1 What is Nanotechnology 2 1 2 Nanotechnology in the Food Market 2 2 Nanotechnology in Agriculture 4 2 1 Precision Farming 4 2 2 Smart Delivery Systems 5 2 3 Other Developments in the Agricultural Sector due to Nanotechnology 6 3 Nanotechnology in the Food Industry 7 3 1 Packaging and Food Safety 7 3 2 Food Processing 10 4 Conclusions 12 Further Reading 13 About Nanoforum 14 1 Introduction The current global population is nearly 6 billion with 50 living in Asia A large proportion of those living in developing countries face daily food shortages as a result of environmental impacts or political instability while in the developed world there is a food surplus For developing countries the drive is to develop drought and pest resistant crops which also maximize 
Interfacing Biology with Nanomaterials Murali Sastry Nanoscience Group Materials Chemistry Division National Chemical Laboratory Pune 411 008 E mail sastry ems ncl res in Indo US Meeting on Nanomaterials 11 13 August 2004 IISc Bangalore Making the connection between nanomaterials and biologicals Biological methods for the synthesis of inorganic nanoparticles Amino acids stabilization of nanoparticles assembly of nanoparticles amino acid stabilized nanoparticles as templates for mineral growth Proteins enzymes reusable biocatalysts 3 DNA PNA structural interconnects nanoparticle assembly application in biodiagnostics Inorganic nanoparticles as scaffolds for immobilization of Free standing nanogold membranes 1 Biological nanosynthesis methods Exquisite nanoscale mesoscale structures in nature Diatoms marine organisms amorphous silica Magnetotactic bacteria magnetite nanoparticles Biomimetic approach to advanced materials particularly nanomaterials 2 Biosynthesis of nano silver using bacteria Pseudomonas stutzeri extracted from silver 
Nano Materials and Nanotechnology Dr R Ramaseshan From University of Tennessee web site Forward What is Nanotechnology Variants of Nanotechnology Drawbacks What is Nanotechnology Loosely defined as Matter at dimensions roughly in the range of 1 100nm Exploitation of novel and improved properties phenomena and processes specific at the scale level discussed earlier The technology to build Nano level matter using either a bottom up b top down process What makes nanostructured materials interesting Electronics and optical applications Can be defect free electrons move ballistically Quantum confinement optical properties Mechanical Properties Small enough to be defect free thus exhibiting ideal strength Thermal Properties Can be designed to conduct substantially or worse than the bulk materials Chemical Properties Dominated by large surface to volume ratio Nanotechnologies Dry Nanotechnology which drives from surface science and physical chemistry focuses on fabrication of physical structures of inorganic materials Si C Wet 
