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Picture
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  DLSU-ANGELO KING INSTITUTE FOR ECONOMIC AND BUSINESS STUDIES
A Study and Evaluation of Meat Freshness using Tin Oxide Nanomaterial e-Nose Sensor
Presented by: Dr. Gil Nonato C. Santos, Physics Department of College of Science, De La Salle University
Date of presentation: 18 March 2016 (Friday)
Venue: Tereso Lara Seminar room (L230), De La Salle University


Abstract
The study examined the effect of applied magnetic field (AMF) on the surface morphology and elemental composition of tin oxide (SnO2) nanomaterials using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) Analysis. Photoluminescence characterization was also completed using Applied Spectral Imaging SD-300.  The current –voltage (IV) characteristics were determined using the Keithley 2400 Source Meter and Keithley 2010 multimeter, the result from which the resistivity of the sample was computed. The study also explored the gas sensing capability of the synthesized nanomaterials. 
The nanomaterials were produced using the HVPG deposition method where fused quartz tubes containing 35 mg of SnO2 powder were evacuated down to 10-6 Torr and annealed at a temperature of 1,200 ºC at growth time of 4 hours, 6 hours, and 8 hours with a ramp time of 40 minutes using a Thermolyne horizontal tube furnace. The magnetic field intensity was varied to 2500 gauss and 3100 gauss as well as the position of the permanent magnet along the tube.
In the absence of AMF, the diameters of the grown structures was found to be directly proportional to the growth time. With the presence of AMF, nanowire formation was favored with a more defined structure and greater density when the magnet is farther from the furnace, section 3b, and at greater intensity, 3100 gauss. A greater density of nanowire deposit at the mentioned section was also observed in longer growth time, 8 hours. On the other hand, lower magnetic field intensity, 2500 gauss, was observed to produce lower density and length of structures. The presence of the external magnetic field, along with the presence of temperature gradient, was found to be responsible for the formation of the homogenized nanowires. However, the temperature gradient has a greater influence than the presence of external magnetic field in the growth of the nanowire. EDX confirms the presence of tin oxide on the structures formed in sections of the tube. 
Most of the samples in the absence of AMF showed blue light emission giving an energy gap around 2.6 eV – 2.9 eV. While, the experimental samples applied with external magnetic field showed red light emission as well, with greater area of luminescence in the 3100 gauss AMF set-ups, giving an energy gap around 1.7 eV– 1.9 eV with lower energy gap for longer growth time, 8 hours. 
In the absence of AMF, the values of the resistance and resistivity were found to increase with increasing growth time. Meanwhile a decrease in the resistivity of the sample was observed as the AMF intensity and the growth time increased. The nanostructures synthesized with AMF under the optimized condition were found to be sensitive to CO2 gas, acetone, and methanol vapor. It was also able to detect spoiled meat headspace gas
 
About the Author
Dr. Gil Nonato C. Santos is a Full Professor and Chairman of the De La Salle University Physics Department. He has an undergraduate and graduate degree in Physics at De La Salle University and University of the Philippines and a Doctorate degree in Materials Science and Engineering at the University of the Philippines Diliman National Institute of Physics. He is a Research Fellow at the University of Fukui doing research of nanocomposite materials and its terahertz applications, and Visiting Professor in Osaka University Quantum Engineering Laboratory and at Howard University's Atmospheric Science Research Laboratory . He is the Research Head of the Solid State Physics Laboratory, Inanolab research facility, and had published local and international publications in Nanomaterials. He has a patent work for growing nanomaterials called the horizontal vapor phase growth (HVPG) technique. He is the convenor of Philippine Association of Physics and Science Instructors and was awarded Most Outstanding Service Award in 2010 by the Philippine Physics Society. In 2012, he was a recipient of the Challenge Grant for establishing an Air Weather Observation System for De La Salle Philippines and Volunteer Schools called SIGWA (Students Involve in Geophysical Weather and Atmospheric studies) and an AKI grant for developing a nanosensor for detecting meat spoilage. He also obtained a research grant from DOST for developing Tin Oxide Silver Nanocomposite materials for antiheat and antibacterial applications and a US Aid Carwin Grant for developing nanocomposite materials for anticorrosion and antibarnacle applications for ship hull.

Download the presentation here​
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      • LECTURES >
        • The use of smart devices for the detection of aflatoxin in grinded corn feeds
        • Ang Dalawang Mukha ng mga Pamamaraan
        • Small open economy DSGE model with natural disaster and foreign aid
        • Bakit hindi episyente at mapagpantay
        • Estado ng Ekonomiya ng Pilipinas
        • Meat Freshness using Tin Oxide
        • Entitlement mentality: Undertones in unproductive conflict in family businesses
        • Developing a sustainable food security program
        • Challenges and strategies in pursuing financial and social bottom-lines: Managing for-profit social enterprises in the Philippines
        • Mas mahal sa UP kaysa DLSU
        • Climate risk analysis on the food security in Saguday
        • Urban hydroponics for diversified agriculture: Part II
        • Impact of accessibility to schools and economic centers on poverty and gender equity in the Philippines
        • Determining the directional flows of FDI in manufacturing in the ASEAN region
        • Sapat na ba ang pagsesenyas upang tugunan ang di pagtugma sa bilihan ng paggawa?
        • Assessing the impacts of the food and cash grant on poverty alleviation in the Philippines
        • Correlates of hunger: Evidence from the Community-Based
        • Urban rooftop hydroponics for diversified agriculture: Pilot project
        • Issues on trade & investment: Implications for further research
        • Signal extraction from the components of the Philippines national accounts statistics using ARIMA model-based methodology
        • International migration and remittances: A review of economic impacts, issues and challenges from the sending country's perspective
        • Geographic profiling of poverty and accessibility
        • Mga alternatibo sa labas ng mga pandaigdigang tugon sa pagpigil sa pagbabago ng klima
        • Global economic crisis
        • Economic, demographic, & other factors affecting school participation among children in urban and rural households: The case of Pasay & Eastern Samar
        • How flexible are wages across barangays?
        • Identifying the poor using CBMS
        • Price shocks and subsidy reforms
        • The missing dimensions of poverty
        • The migration of skilled workers as a policy tool for enhancing human capital formation and raising welfare
        • The basic principles in the economics of competition law
      • SEMINARS >
        • Development Studies in Action
        • Poverty and distributional impact of alternative rice policies in the Philippines
        • Energy, Water, and Food under Climate Change: Tradeoffs and Policies
        • A world trade organization for the 21st century
        • Free trade agreements and Phil. business
        • Quality education for all
      • SYMPOSIUM >
        • 2020 Virtual United Nations World Data Forum
        • PASCN General Assembly 2017
        • Symposium on the Economics of Climate Change in Southeast Asia
        • Globalization & sustainability
      • CONFERENCES >
        • Innovations and Tools for Implementing Programs on Health, Livelihood and Poverty Reduction
      • WORKSHOPS >
        • Multiregional Disaster Risk Analysis in the Philippines
        • Research Forum on Economic Systems Modelling for Disaster Risk Assessment
        • Modelling the economic impact of disasters
        • CIS Multi-Stakeholders' Workshop
        • City innovation systems foresight & scenario-building workshop
      • SPECIAL EVENTS >
        • Monograph launch: Entrepreneurship in the Philippines 2015-2016 report
        • Social Welfare Functions and Development: Measurement and Policy Applications
        • Book Launching of the Pathways out of Poverty and Entrepreneurship and Trade
        • Entrepreneurship in the Philippines 2014 report launch
        • Entrepreneurship in the Philippines: 2013 Report launch
        • Monograph Launch-Globalization, Adjustment & the Challenge of Inclusive Growth
        • Mobilizing for a decade of development
        • Fifth year anniversary
        • Toward an Efficient Electric Power Industry
  • RESEARCH PROJECTS
    • ONGOING PROJECTS >
      • Research for Supporting Holistic and Actionable Research in Education (SHARE): Higher Education Institutions Generating Holistic and Transformative Solutions (HEIGHTS) –Financial Sustainability
      • Addressing context-specific barriers to female labor force participation in decent work in the Philippines
      • Philippine Living Income Study Project
      • Development of an Economic White Paper for the Local Food & Beverage Industry
      • C-LEAD Project
      • TESDP
    • COMPLETED PROJECTS >
      • Strengthening E-commerce cooperation to promote business to business and business to consumers under AHKFTA: a case study of ASEAN countries and Hong Kong Special Administrative Region of the People’s Republic of China
      • Driving inclusion through Empowerment and Decent Work: The case of Filipino women in online work​
      • Research-Gendered Impacts of SME Policy Responses to Covid-19 in South East Asia: Examples from the Philippines
      • Disaster Risk Assessment Computation Using Leontief Analysis: Theoretical Explorations in Assessing Disaster Impacts
      • Training Workshops on Impact Evaluation
      • PAGE II
      • Economic Impact of Aviation, Travel and Tourism Industries in the Philippines
      • Issues Paper on Grocery and Supermarket Retail Business in the Philippines
      • Design and conduct of the training on economic principles
      • Development of a web-based tool for disaster risk reduction
      • Promoting entrepreneurship research in South East Asia: Applying global entrepreneurship monitor
      • Comparison of vulnerability of developed and developing economies to disaster ripple effects: The case of Japan and the Philippines
      • The higher education accountability and transparency portal (HEAT Portal)
      • Policy recommendations for the expansion of the securitization market in the ASEAN+3 countries
      • International discussions on the credit rating agencies and enhancing infrastructure to strengthen regional credit rating capacity in the ASEAN+3 region
      • Development of industry career guides: Phase II
      • The roles and functions of the banking sector in the financial system of the ASEAN+3 region
      • Development of industry career guides: Phase I
      • Towards innovative, liveable and prosperous Asian megacities
      • The trends in trade, foreign direct investments and monetary flows in East Asia, and its policy implications
      • Towards greater financial stability in the Asia region: Measures for the possible use of regional monetary units for surveillance and transaction
      • Globalization, adjustment, and the challenge of inclusive growth: Furthering inclusive growth and industrial upgrading in Indonesia, the Philippines, and Vietnam
      • Partnership and advocacy for competitiveness and trade (PACT)
      • Meeting the challenges of globalization: Production networks, industrial adjustment, institutions and policies, and regional cooperation
      • Formulation of a list of investment areas to be liberalized
      • Impacts, risks and opportunities of financial liberalization and integration: A macro-micro analysis
  • PUBLICATIONS
    • AKI POLICY BRIEFS
    • BOOKS AND MONOGRAPHS
  • CONTACT US