A-level Activated Science Colour Allure Acrylic Ambuscade ability assurance
03 October 05:17
Assurance of ambuscade ability using a colorimeter.
The ambuscade ability of a acrylic can be abstinent as the array of acrylic appropriate to abstruse 98 % of the colour of the substrate.
On a colorimeter, this corresponds to a manual of 2 % or an absorbance of 1.7.
[Absorbance = -log10 (transmission)].
If we can adulterate the acrylic so that its absorbance is 1.7, then we can say that acrylic this adulterate will charge to be activated 1 cm blubbery to accomplish 98 % coverage.
More helpfully, if we accept adulterated the acrylic by a agency of 500, we can say that the undiluted acrylic needs to be 1/500 cm blubbery to accomplish 98 % coverage. 1/500 cm is 0.002 cm or 20 ?m (microns).
Try this example. You will charge to draw a blueprint of concoction (horizontal axis) adjoin absorbance (vertical axis). Use the blueprint to acquisition the concoction appropriate for 98 % coverage. Account the array of authentic acrylic that is required.
Manufacturers of acrylic usually accord the amount of aboveboard metres that can be covered by 1 litre of paint. We can account this amount too. The aggregate 1 litre is 1 x 10-3 m3. A array of 20 ?m is 20 x 10-6 m. The breadth that can be covered is the aggregate disconnected by the thickness:
1 x 10-3 m3
20 x 10-6 m
= 50 m2
Try the aforementioned adding with your acknowledgment for the archetype above.
98 % advantage is not aesthetically adorable – patterns beneath the acrylic can still be apparent – so acrylic manufacturers acclaim 5 times the array of acrylic appropriate for 98 % coverage. They would acclaim 10 m2 per litre instead of 50 m2, for example.
Paint is actual viscous, so it is easier to admeasurement baby masses of acrylic than baby volumes. To acquisition the density:
Weigh a 5 cm3 barometer cylinder.
Drip acrylic into the barometer cylinder, demography affliction that acrylic drips anon to the basal after afraid to the sides.
Weigh the butt with its acrylic contents.
Allow the acrylic to achieve and admeasurement its volume.
Calculate the density.
Dilution 1
Weigh a 100 cm3 conical flask.
Add a baby accumulation of acrylic – beneath than 0.5 g.
Weigh the alembic and its acrylic contents.
Add 50 cm3 of bread-and-butter and mix thoroughly. It is actual difficult to banish all the paint.
This 50 cm3 is concoction 1. Account the aggregate of acrylic acclimated (using the body abstinent previously).
The concoction agency is the aggregate of bread-and-butter acclimated (50 cm3), disconnected by the aggregate of acrylic used.
Measure the absorbance or manual of this sample. If demography samples of adulterated paint, create abiding the acrylic is appropriately afflicted afore sampling.
If the manual is added than 2 %, or the absorbance is beneath than 1.7, then the sample is too adulterate and you charge to create a new concoction using added paint.
Further dilution
To a 10 cm3 barometer cylinder, add;
1 cm3 concoction 1
Solvent up to the 10 cm3 mark.
Mix thoroughly and admeasurement the absorbance/transmission as before. This is concoction 2.
If the absorbance is still greater than 1.7, or the manual is beneath than 2 %, you will charge to create a added adulterate sample.
Take 1 cm3 of concoction 2 and create it up to 10 cm3 – this will accord a concoction of 100 x concoction 1.
If the absorbance is now beneath than 1.7 (or the manual is greater than 2 %), you will charge to create some beneath adulterate samples. Try demography 1 cm3 of concoction 1 and authoritative it up to 5 cm3, or 2 cm3 of concoction 1 to 5 cm3, etc.
Use your action to create several dilutions which accept absorbance about 1.7.
Plot the after-effects on a blueprint and acquisition absolutely what concoction would accord an absorbance of 1.7.
Calculate the array (in microns) of authentic acrylic appropriate for 98 % coverage.
Calculate the breadth (in aboveboard metres) that 1 litre of acrylic could cover.
The ambuscade ability of a acrylic can be abstinent as the array of acrylic appropriate to abstruse 98 % of the colour of the substrate.
On a colorimeter, this corresponds to a manual of 2 % or an absorbance of 1.7.
[Absorbance = -log10 (transmission)].
If we can adulterate the acrylic so that its absorbance is 1.7, then we can say that acrylic this adulterate will charge to be activated 1 cm blubbery to accomplish 98 % coverage.
More helpfully, if we accept adulterated the acrylic by a agency of 500, we can say that the undiluted acrylic needs to be 1/500 cm blubbery to accomplish 98 % coverage. 1/500 cm is 0.002 cm or 20 ?m (microns).
Try this example. You will charge to draw a blueprint of concoction (horizontal axis) adjoin absorbance (vertical axis). Use the blueprint to acquisition the concoction appropriate for 98 % coverage. Account the array of authentic acrylic that is required.
Manufacturers of acrylic usually accord the amount of aboveboard metres that can be covered by 1 litre of paint. We can account this amount too. The aggregate 1 litre is 1 x 10-3 m3. A array of 20 ?m is 20 x 10-6 m. The breadth that can be covered is the aggregate disconnected by the thickness:
1 x 10-3 m3
20 x 10-6 m
= 50 m2
Try the aforementioned adding with your acknowledgment for the archetype above.
98 % advantage is not aesthetically adorable – patterns beneath the acrylic can still be apparent – so acrylic manufacturers acclaim 5 times the array of acrylic appropriate for 98 % coverage. They would acclaim 10 m2 per litre instead of 50 m2, for example.
Paint is actual viscous, so it is easier to admeasurement baby masses of acrylic than baby volumes. To acquisition the density:
Weigh a 5 cm3 barometer cylinder.
Drip acrylic into the barometer cylinder, demography affliction that acrylic drips anon to the basal after afraid to the sides.
Weigh the butt with its acrylic contents.
Allow the acrylic to achieve and admeasurement its volume.
Calculate the density.
Dilution 1
Weigh a 100 cm3 conical flask.
Add a baby accumulation of acrylic – beneath than 0.5 g.
Weigh the alembic and its acrylic contents.
Add 50 cm3 of bread-and-butter and mix thoroughly. It is actual difficult to banish all the paint.
This 50 cm3 is concoction 1. Account the aggregate of acrylic acclimated (using the body abstinent previously).
The concoction agency is the aggregate of bread-and-butter acclimated (50 cm3), disconnected by the aggregate of acrylic used.
Measure the absorbance or manual of this sample. If demography samples of adulterated paint, create abiding the acrylic is appropriately afflicted afore sampling.
If the manual is added than 2 %, or the absorbance is beneath than 1.7, then the sample is too adulterate and you charge to create a new concoction using added paint.
Further dilution
To a 10 cm3 barometer cylinder, add;
1 cm3 concoction 1
Solvent up to the 10 cm3 mark.
Mix thoroughly and admeasurement the absorbance/transmission as before. This is concoction 2.
If the absorbance is still greater than 1.7, or the manual is beneath than 2 %, you will charge to create a added adulterate sample.
Take 1 cm3 of concoction 2 and create it up to 10 cm3 – this will accord a concoction of 100 x concoction 1.
If the absorbance is now beneath than 1.7 (or the manual is greater than 2 %), you will charge to create some beneath adulterate samples. Try demography 1 cm3 of concoction 1 and authoritative it up to 5 cm3, or 2 cm3 of concoction 1 to 5 cm3, etc.
Use your action to create several dilutions which accept absorbance about 1.7.
Plot the after-effects on a blueprint and acquisition absolutely what concoction would accord an absorbance of 1.7.
Calculate the array (in microns) of authentic acrylic appropriate for 98 % coverage.
Calculate the breadth (in aboveboard metres) that 1 litre of acrylic could cover.
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