SUVACI RESEARCH GROUP Lets Shape the Future through

SUVACI RESEARCH GROUP Let’s Shape the Future through Materials Science Ender SUVACI Eskişehir Technical University esuvaci@anadolu. edu. tr https: //endersuvaci. wordpress. com

Objective • Increase awareness about Properties of Materials

Materials Science and Engineering PERFORMANCE PROCESSING PROPERTIES STRUCTURE • Atomic structure • Electronic structure • Crystal structure • Nanostructure • Microstructure • Macrostructure

From Macrostructure to Atomic Structure; Structure Levels; Macro Structure https: //www. youtube. com/watch? v=_n-h. Dut. A 5 ws

From Macrostructure to Atomic Structure; Structure Levels; Micro Structure Suvacı Research Group (SRG) Anadolu University

From Macrostructure to Atomic Structure; Structure Levels; Nano Structure http: //phys. org/news/2012 -01 -graphene-quantum-dots-big-small. html https: //www. bo. imm. cnr. it/site/node/561 6

From Macrostructure to Atomic Structure; Structure Levels; Atomic Structure http: //physics. oregonstate. edu/~minote/COURSES/ph 427/doku. php? id=1 7

Materials Science and Engineering PERFORMANCE PROCESSING PROPERTIES STRUCTURE • Atomic structure • Electronic structure • Crystal structure • Nanostructure • Microstructure • Macrostructure

Property? ? ? Response= Property x Stimulus (external influence/field/force…)

Property A coefficient, that determines the magnitude of the response when the material is subjected to a stimulus (or external field/force).

Materials Science and Engineering PERFORMANCE PROCESSING STRUCTURE • Atomic structure • Electronic structure • Crystal structure • Nanostructure • Microstructure • Macrostructure PROPERTIES Physical Chemical ? ?

Chemical Properties • how a material interacts with another material • “social” behavior • response to other matter (or lack of response) • reactions

Chemical Properties • Examples: – – – burning reaction with acid reaction with water corrosion/rusting/oxidation others? ?

Physical Properties • characteristics it possesses by itself (in and of itself) • “personal” traits

Physical Properties • • • color size texture melting point boiling point solubility • • • luster density magnetism odor viscosity

Materials Science and Engineering PERFORMANCE PROCESSING STRUCTURE • Atomic structure • Electronic structure • Crystal structure • Nanostructure • Microstructure • Macrostructure PROPERTIES Mechanical Thermal Optical Electrical Magnetic Chemical Biological Nuclear

• Electrical properties – conductor or insulator • Optical properties – response to light – index of refraction – bending of light – transparent – light passes through – translucent – some light passes through but no distinct image – opaque – no light passes through

• Thermal properties – response to heat – conductivity – specific heat – how much energy it takes to change temperature – thermal expansion – example: iron wire demo

Mechanical Properties • response to force or stress – force – a push or pull – stress – force causing a deformation or distortion (force per unit area)

Mechanical Properties Examples • workability – malleability – can be flattened – ductility – can be drawn into wire (stretched), bent, or extruded

Mechanical Properties Examples • brittleness – breaks instead of deforming when stress is applied • hardness – resistance to denting or scratching

Mechanical Properties Examples • elasticity – ability to return to original shape after being deformed by stress – rubber ball or piece of elastic • plasticity – retains new shape after being deformed by stress – wet clay ball or piece of polyethylene food wrap

Mechanical Properties Examples • toughness – ability to absorb energy – resistance to fracture • strength – resistance to distortion by stress or force – several types: tensile, compressive, torsional, bending, shear

Types of Stresses/Forces • Tension – pulling – examples: tug-of-war, slingshot • Compression – pushing together or squeezing – examples: bed springs, can crusher, bench vise

straight line = elastic region curved line = plastic region Ceramic or glass stress metal polymer strain

1. 5. 3 A first encounter with symmetry

1. 5. 3 A first encounter with symmetry

1. 5. 3 A first encounter with symmetry

Passive Infrared Sensor-PIR

Better Diesel Injection Systems for a Sustainable Future

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Ba. Ti. O 3 20 m *Electrical characterization results, courtesy of SIEMENS AG Corporate Technology. T. Richter, E. Suvacı, et al. , J. Amer. Ceram. Soc. , 91 (3) 929 -933 (2008)

Heat Insulation in Refrigerators (please see the poster on the hallway)

Sert Poliüretan Köpükte Isıl Özellikler λt= λm+ λr+ λg λr, radyasyon (ışınım) ile ısı iletimi λm, katı polimer matrisinin ısıl iletimi %25 -35 %20 -30 %50 -60 λg, gazın ısıl iletimi ɸ= Hücre çapı ρf= Köpük yoğunluğu ρs= Katı polimer yoğunluğu Glicksman tarafından Kw = 60000 m-1 olarak bulunmuştur Smits, G. F. , “Effect of Cellsize Reduction on Polyurethane Foam Physical Properties”, DOW Benelux J. THERMAL INSUL. AND BLDG. ENVS. , 17, 1994. Gibson, L. J. ve Ashby, M. F. , (1997), Cellular Solids, (2. baskı), Cambridge Solid State Science Series Yayınları

Yapı - Özellik İlişkisi-Isıl iletkenlik Hücre boyutu-ısıl iletkenlik ilişkisi Ortalama serbest yol (Knudsen etkisi) Hücre boyutu <10 μm ise bu etki görülür 2. Bölge Ortalama hücre boyutu (um) 1. Bölge 3. Bölge 4. Bölge Sinofsky, M. , Property measurement and thermal performance prediction of foam insulation, Yüksek lisans tezi, MIT, Cambridge Massachusetts, 1984.

High Purity Oxide Targets for Anti. Reflecting Thin Film Coatings http: //www. gkboptical. com/lens-coating/ 38

High purity is very critical! Impurities of transition elements can affect transmission properties of dielectric layers. ü applicable for ultraviolet (~200 nm)-infrared (~3 mm) region antireflecting coatings, ü low material damage and limited absorption during high energy laser applications, ü Coating material for windows, prisms, lenses, high energy laser optics

Development of Longer Cycle Life Lead Acid Batteries

Capacity (A. h) Cycle Number Fumed Silika (Si. O 2) + Boroksit, (B 2 O 3) Fumed Silika, (Si. O 2) + Alüminyum Oksit, (Al 2 O 3) Fumed Silika, (Si. O 2) + Magnezyum Sülfat, (Mg. SO 4) Fumed Silika, (Si. O 2) + Sodyum Sülfat, (Na 2 SO 4), Fumed Silika, (Si. O 2) + Titanyum (IV) Oksit, (Ti. O 2) Fumed Silika, (Si. O 2) + Alüminyum Oksit, (Al 2 O 3) + Titanyum (IV) Oksit, (Ti. O 2) + Boroksit, (B 2 O 3) Fumed Silika, (Si. O 2) + Alüminyum Oksit, (Al 2 O 3) + Titanyum (IV) Oksit, (Ti. O 2)) Fumed Silika, (Si. O 2) + Alüminyum Oksit, (Al 2 O 3) + Boroksit, (B 2 O 3) Sülfürik Asit, (H 2 SO 4)

Thank You