Ever noticed that if you spill coffee on to a table and let it dry, the colour will be concentrated at the edges of the stain?
The intriguing phenomenon has been put under the microscope, and scientists say their findings may encourage a revolution in printing, paints and product coatings.
The "coffee-ring effect", they report, derives from two factors: the shape of the particles - molecules of coffee, ink, dye, and so on - in the liquid and the way these particles respond to surface tension.
Round particles tend to gather at the perimeter of the drop, which explains why they remain in a ring once it has dried, according to the research. But particles that are elongated or ellipsoid distribute themselves in looser clumps, which makes it easier to smooth them across the entire surface.
"This work gives us a new idea about how to make a uniform coating, relatively simply," Arjun Yodh of the University of Pennsylvania said.
"If you change the particle shape, you can change the way a particle is deposited. "You can also make mixtures. In some cases, even just a small amount of ellipsoids can change the way the particles deposit when they dry."
The investigation was published in Nature, the British science journal.
Illegal%20shipments%20intercepted%20in%20Gulf%20region
%3Cp%3EThe%20Royal%20Navy%20raid%20is%20the%20latest%20in%20a%20series%20of%20successful%20interceptions%20of%20drugs%20and%20arms%20in%20the%20Gulf%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMay%2011%3A%20%3C%2Fstrong%3EUS%20coastguard%20recovers%20%2480%20million%20heroin%20haul%20from%20fishing%20vessel%20in%20Gulf%20of%20Oman%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMay%208%3A%3C%2Fstrong%3E%20US%20coastguard%20vessel%20USCGC%20Glen%20Harris%20seizes%20heroin%20and%20meth%20worth%20more%20than%20%2430%20million%20from%20a%20fishing%20boat%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMarch%202%3A%3C%2Fstrong%3E%20Anti-tank%20guided%20missiles%20and%20missile%20components%20seized%20by%20HMS%20Lancaster%20from%20a%20small%20boat%20travelling%20from%20Iran%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EOctober%209%2C%202022%3A%20%3C%2Fstrong%3ERoyal%20Navy%20frigate%20HMS%20Montrose%20recovers%20drugs%20worth%20%2417.8%20million%20from%20a%20dhow%20in%20Arabian%20Sea%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ESeptember%2027%2C%202022%3A%3C%2Fstrong%3E%20US%20Naval%20Forces%20Central%20Command%20reports%20a%20find%20of%202.4%20tonnes%20of%20heroin%20on%20board%20fishing%20boat%20in%20Gulf%20of%20Oman%C2%A0%3C%2Fp%3E%0A
What can victims do?
Always use only regulated platforms
Stop all transactions and communication on suspicion
Save all evidence (screenshots, chat logs, transaction IDs)
Report to local authorities
Warn others to prevent further harm
Courtesy: Crystal Intelligence
COMPANY%20PROFILE
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The specs
Engine: 4.0-litre V8 twin-turbocharged and three electric motors
Power: Combined output 920hp
Torque: 730Nm at 4,000-7,000rpm
Transmission: 8-speed dual-clutch automatic
Fuel consumption: 11.2L/100km
On sale: Now, deliveries expected later in 2025
Price: expected to start at Dh1,432,000
THE%20SPECS
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Mountain Classification Tour de France after Stage 8 on Saturday:
- 1. Lilian Calmejane (France / Direct Energie) 11
- 2. Fabio Aru (Italy / Astana) 10
- 3. Daniel Martin (Ireland / Quick-Step) 8
- 4. Robert Gesink (Netherlands / LottoNL) 8
- 5. Warren Barguil (France / Sunweb) 7
- 6. Chris Froome (Britain / Team Sky) 6
- 7. Guillaume Martin (France / Wanty) 6
- 8. Jan Bakelants (Belgium / AG2R) 5
- 9. Serge Pauwels (Belgium / Dimension Data) 5
- 10. Richie Porte (Australia / BMC Racing) 4
UAE currency: the story behind the money in your pockets
Ferrari 12Cilindri specs
Engine: naturally aspirated 6.5-liter V12
Power: 819hp
Torque: 678Nm at 7,250rpm
Price: From Dh1,700,000
Available: Now
'HIJRAH%3A%20IN%20THE%20FOOTSTEPS%20OF%20THE%20PROPHET'
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More coverage from the Future Forum
Tips to stay safe during hot weather
- Stay hydrated: Drink plenty of fluids, especially water. Avoid alcohol and caffeine, which can increase dehydration.
- Seek cool environments: Use air conditioning, fans, or visit community spaces with climate control.
- Limit outdoor activities: Avoid strenuous activity during peak heat. If outside, seek shade and wear a wide-brimmed hat.
- Dress appropriately: Wear lightweight, loose and light-coloured clothing to facilitate heat loss.
- Check on vulnerable people: Regularly check in on elderly neighbours, young children and those with health conditions.
- Home adaptations: Use blinds or curtains to block sunlight, avoid using ovens or stoves, and ventilate living spaces during cooler hours.
- Recognise heat illness: Learn the signs of heat exhaustion and heat stroke (dizziness, confusion, rapid pulse, nausea), and seek medical attention if symptoms occur.
More from Aya Iskandarani
ASIAN%20RUGBY%20CHAMPIONSHIP%202024
%3Cp%3E%3Cstrong%3EResults%3C%2Fstrong%3E%3Cbr%3EHong%20Kong%2052-5%20UAE%3Cbr%3ESouth%20Korea%2055-5%20Malaysia%3Cbr%3EMalaysia%206-70%20Hong%20Kong%3Cbr%3EUAE%2036-32%20South%20Korea%3Cbr%3E%3Cbr%3E%3Cstrong%3EFixtures%3C%2Fstrong%3E%3Cbr%3EFriday%2C%20June%2021%2C%207.30pm%20kick-off%3A%20UAE%20v%20Malaysia%3Cbr%3EAt%20The%20Sevens%2C%20Dubai%20(admission%20is%20free).%3Cbr%3ESaturday%3A%20Hong%20Kong%20v%20South%20Korea%3Cbr%3E%3C%2Fp%3E%0A
More from Neighbourhood Watch:
Global state-owned investor ranking by size
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United States
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China
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UAE
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Japan
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Norway
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Canada
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Singapore
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Australia
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More from Rashmee Roshan Lall
Electoral College Victory
Trump has so far secured 295 Electoral College votes, according to the Associated Press, exceeding the 270 needed to win. Only Nevada and Arizona remain to be called, and both swing states are leaning Republican. Trump swept all five remaining swing states, North Carolina, Georgia, Pennsylvania, Michigan and Wisconsin, sealing his path to victory and giving him a strong mandate.
Popular Vote Tally
The count is ongoing, but Trump currently leads with nearly 51 per cent of the popular vote to Harris’s 47.6 per cent. Trump has over 72.2 million votes, while Harris trails with approximately 67.4 million.
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What are the influencer academy modules?
- Mastery of audio-visual content creation.
- Cinematography, shots and movement.
- All aspects of post-production.
- Emerging technologies and VFX with AI and CGI.
- Understanding of marketing objectives and audience engagement.
- Tourism industry knowledge.
- Professional ethics.
Company%20profile%20
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A MINECRAFT MOVIE
Director: Jared Hess
Starring: Jack Black, Jennifer Coolidge, Jason Momoa
Rating: 3/5
Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.
FIGHT%20CARD
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Stormy seas
Weather warnings show that Storm Eunice is soon to make landfall. The videographer and I are scrambling to return to the other side of the Channel before it does. As we race to the port of Calais, I see miles of wire fencing topped with barbed wire all around it, a silent ‘Keep Out’ sign for those who, unlike us, aren’t lucky enough to have the right to move freely and safely across borders.
We set sail on a giant ferry whose length dwarfs the dinghies migrants use by nearly a 100 times. Despite the windy rain lashing at the portholes, we arrive safely in Dover; grateful but acutely aware of the miserable conditions the people we’ve left behind are in and of the privilege of choice.
The biog
Name: Dr Lalia Al Helaly
Education: PhD in Sociology from Cairo
Favourite authors: Elif Shafaq and Nizar Qabbani.
Favourite music: classical Arabic music such as Um Khalthoum and Abdul Wahab,
She loves the beach and advises her clients to go for meditation.
Company profile
Name: Oulo.com
Founder: Kamal Nazha
Based: Dubai
Founded: 2020
Number of employees: 5
Sector: Technology
Funding: $450,000
Spec%20sheet
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SPEC%20SHEET%3A%20APPLE%20M3%20MACBOOK%20AIR%20(13%22)
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