File:Lead(II) iodide crystals grown in silica gel.JPG
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[edit]DescriptionLead(II) iodide crystals grown in silica gel.JPG |
English: A mixture of acetic acid, lead(II) acetate and sodium silicate solutions was poured into a large test tube, and left to rest until a gel was formed. After that potassium iodide solution was poured onto the surface of the gel. Yellow lead(II) iodide precipitate formed immediately on the gel's surface. After a day yellow crystals appeared in the gel. Slowly, the iodide ions migrated into the gel and reacted with the lead(II) ions trapped in the gel thus forming small spectacular lead(II) iodide crystals. The formation of the bright yellow crystals lasts for days. It is clearly visible that the spatial arrangement of the crystals initially very tight, but eventually loosens as iodide ions has to diffuse into the deepest reaches of the gel. Two crystal forms are prevalent: fern-like shapes and hexagonal platelets. Magyar: Ecetsav, ólom(II)-acetát és nátrium-szilikát oldatait kevertem össze, majd öntöttem egy nagy kémcsőbe. A keveréket pihentettem, amíg gél keletkezett belőlük. Ezután kálium-jodid-oldatot öntöttem a gél felszínére. Azonnal sárga ólom(II)-jodid csapadék keletkezett a gél felszínén. Egy nap múlva sárga kristályok jelentek meg a gélben. A jodidionok lassacskán a gélbe vándoroltak, ahol reagáltak az ólom(II)-ionokkal, ezáltal pedig apró, de látványos ólom(II)-jodid kristályokat hoztak létre. A ragyogó sárga kristályok keletkezése napokig tart. Jól látható, hogy a kristályok térbeli elhelyezkedése eleinte szoros, de idővel lazábbá válik, ahogy a jodidionok messzebbre vándorolnak a gél mélyébe. Két kristályforma az uralkodó: a páfrányszerűek és a hatszöges lemezkék. English: Lead(II) iodide crystals grown in silica gel |
Date | |
Source | Own work |
Author | Sjtanarur |
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This image was uploaded as part of European Science Photo Competition 2015. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:38, 30 November 2015 | 4,000 × 3,000 (2.37 MB) | Sjtanarur (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX40 HS |
Exposure time | 1/15 sec (0.066666666666667) |
F-number | f/2.7 |
ISO speed rating | 100 |
Date and time of data generation | 18:29, 30 November 2015 |
Lens focal length | 4.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 18:29, 30 November 2015 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 18:29, 30 November 2015 |
Meaning of each component |
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Image compression mode | 5 |
APEX shutter speed | 3.90625 |
APEX aperture | 2.875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.875 APEX (f/2.71) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,393.442622951 |
Focal plane Y resolution | 16,393.442622951 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Rating (out of 5) | 0 |
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30 November 2015
Hidden categories:
- General category images from European Science Photo Competition 2015
- CC-BY-SA-4.0
- Self-published work
- Images from European Science Photo Competition 2015 in Hungary
- Uploaded via Campaign:espc-hu
- Images from European Science Photo Competition 2015 in Hungary - General category
- Taken with Canon PowerShot SX40 HS