BENGALURU: A team of Indian researchers has developed a bioinspired aluminium surface with properties that could benefit industries ranging from marine engineering to food packaging and healthcare. The findings, published in ‘Colloids and Surfaces B: Biointerfaces’, highlight how mimicking structures found in nature, such as lotus leaves and insect wings — can yield multifunctional surfaces that repel water, resist corrosion and bacteria, and clean themselves with minimal water. Led by Harpreet S Grewal, the team from Shiv Nadar University in Delhi-NCR created micro-and-nanostructured aluminium surfaces using a low-cost and environmentally friendly process. The method, which involves imprinting aluminium sheets with micro-patterns and then immersing them in hot water, resulted in two distinct surfaces: “Nano” and “Hierarchy”. These surfaces were then coated with a fluorinated silane compound to reduce surface energy and enhance water repellency. Tests showed that these treated surfaces could achieve extreme water-repelling (superhydrophobic) or water-attracting (superhydrophilic) states, depending on the treatment. The “Nano” surface, for example, exhibited a contact angle of 163 degree, indicating water droplets roll off easily. Such characteristics are particularly useful in applications where cleanliness or moisture avoidance is crucial. One key application explored was corrosion resistance in marine environments. When tested in saline conditions, the nanostructured surfaces showed significantly reduced corrosion current density, as much as 40 times lower than untreated aluminium, suggesting that these surfaces could extend the lifespan of metal components in seawater. The researchers also evaluated self-cleaning and antibacterial properties. Surfaces with nanostructures required minimal water to remove chalk dust and resisted staining from common liquids like milk and coffee. When exposed to E coli bacteria, the superhydrophilic nanostructured aluminium showed the greatest antibacterial effect, apparently due to the physical rupture of bacterial membranes upon contact with the densely packed nanoscale features. “The dense nanoflakes act almost like a bed of spikes,” Grewal told TOI, explaining how the surface deforms and pierces bacterial cells, thereby reducing biofilm formation without the need for chemical disinfectants. Notably, the fabrication method avoids the use of hazardous chemicals and is designed to be scalable, an important consideration for industrial adoption. “We’ve demonstrated a practical route to multifunctional aluminium surfaces using common materials and straightforward processing,” said co-author Priya Mandal. Beyond marine and food industries, such surfaces could be adapted for biomedical tools, electronics, or packaging materials where contamination control is critical. Their work was supported by the Council of Scientific and Industrial Research (CSIR), India. Further development will focus on testing durability in real-world conditions and scaling up production for commercial use.
The Amazon Great Summer Sale 2025 is underway, offering amazing discounts on the best window air coolers. It’s the perfect time to grab high-quality coolers at significantly reduced prices, ensuring your home stays cool during the hot months ahead. With this sale, you can stay within your budget while enjoying great discounts and cashback offers on top-rated models.
Explore unbeatable deals on the best window air coolers this Amazon Summer Sale 2025 and stay cool all season long.
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Top best selling window air coolers during Amazon Sale 2025:
The Livpure GoodAir Window Air Cooler with a 52 litres tank is made for dry regions where high airflow matters. It runs on a 190 watt motor with overload protection and inverter compatibility, which helps during power cuts. It earns its spot among the best window air coolers thanks to its simple and straightforward performance.
During the Amazon Sale 2025, prices have dropped, making it a good time to buy. With the Amazon Summer Sale 2025, extra card discounts and limited-time offers make it even more attractive. Shoppers during the Amazon Great Summer Sale 2025 can also claim cashback and no cost EMI.
What are buyers saying on Amazon?
Delivers strong airflow and keeps rooms cool for hours.
Why choose this product?
Good for long hours and power-cut prone areas.
The Reliance Window Air Cooler 55 litres in white and grey is made for large spaces that need consistent airflow during peak summer. It easily ranks among the best window air coolers for those who want a basic cooler that does its job day after day. It’s a no-fuss pick for daily use.
With Amazon Sale 2025 offering instant discounts, it’s easier to buy now. Extra deals during Amazon Summer Sale 2025 include bank offers and cashback. And with the Amazon Great Summer Sale 2025, prices on large-capacity coolers are lower than usual.
What are buyers saying on Amazon?
Works well for long hours, decent for big rooms.
Why choose this product?
Built for longer use in wider spaces.
The Orient Electric Magicool Dx 50 litres window air cooler delivers consistent airflow using wood wool cooling pads and a powerful fan system. Its 3-speed control, inverter compatibility, and fragrance chamber are added plus points. Designed for regular home use, it’s among the best window air coolers for those looking for steady airflow and convenience in operation.
During Amazon Sale 2025, enjoy reduced pricing on this cooler. With Amazon Summer Sale 2025, buyers also benefit from extra discounts and cashback. The Amazon Great Summer Sale 2025 offers limited-time deals, making now a good time to pick this model.
What are buyers saying on Amazon?
It gives strong cooling, and works well on the inverter too.
Why choose this product?
Reliable cooler with simple use and added scent feature.
Some top selling desert air coolers if you are looking for them during Amazon Sale 2025: Up to 58% off
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The Kenstar Wave 56 litres wood wool tower window cooler is built for larger rooms and steady airflow. With a 56 litre tank and durable wood wool pads, it delivers consistent cooling. This window cooler is among the best window air coolers for homes needing reliable airflow during longer summers.
During Amazon Sale 2025, this cooler is available at a lower price point. The Amazon Summer Sale 2025 gives added value with cashback and limited-time deals. The Amazon Great Summer Sale 2025 is a solid time to purchase window coolers without spending too much.
What are buyers saying on Amazon?
Reliable cooler for full-day use with strong airflow.
Why choose this product?
It’s made for those who need continuous airflow without interruptions.
The Orient Electric Magicool Neo 50 litres window air cooler is ideal for medium to large spaces, offering strong, consistent cooling with high-density wood wool cooling pads. Its multi-directional airflow ensures thorough circulation, while its versatile placement options make it easy to set up anywhere.
With the Amazon Sale 2025, you can snag this best window air cooler at a fantastic price. The Amazon Summer Sale 2025 brings even more deals, while the Amazon Great Summer Sale 2025 offers exciting offers, making it the best time to shop.
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The Crompton Zelus WAC Window Air Cooler 54 litres is designed to offer powerful, cool airflow with its 4 way air deflection system and wood wool cooling pads. It’s built with an overload protection motor for durability and ensures reliable cooling for medium to large-sized rooms.
Looking for the best window air coolers? With the Amazon Sale 2025, grab this cooler at unbeatable prices. During the Amazon Summer Sale 2025, you can score incredible discounts on a wide range of products. The Amazon Great Summer Sale 2025 is your chance to shop unexceptional deals!
What are buyers saying on Amazon?
Cooling is perfect for my living room.
Why choose this product?
It’s ideal for larger spaces and provides steady airflow.
What is the ideal room size for a window air cooler?
The ideal room size for a window air cooler depends on the cooler’s capacity (measured in liters). Generally, a 50 to 60 litres cooler is best for rooms up to 300 sq. ft. A larger cooler (70L or more) is suitable for bigger spaces. Be sure to check the cooler’s air delivery capacity and the manufacturer’s recommended coverage area to ensure efficient cooling.
How do wood wool cooling pads in window air coolers work?
Woodwool cooling pads absorb water and allow air to pass through them. As the warm air from the room passes through the wet pads, it gets cooled due to the evaporation process. This natural cooling method is highly effective in dry climates, helping maintain a comfortable indoor environment. Woodwool pads also last longer and provide better cooling efficiency compared to other materials.
What type of motor should I look for in the best window air coolers?
When shopping for a window air cooler, look for one with a motor that has overload protection. This ensures the motor does not burn out during extended use or if the cooler operates in a high-temperature environment. Motors with higher wattage (around 190W) usually provide more powerful airflow, making them suitable for larger spaces. Always check for warranty coverage on the motor for added peace of mind.
How can inverter compatibility impact the performance of window air coolers?
Inverter compatibility in window air coolers allows the cooler to adjust its motor speed according to the cooling demand. This can lead to energy savings, as the motor doesn’t run at full speed constantly, thus reducing electricity consumption. It also helps maintain a more consistent temperature by offering better temperature regulation. Inverter-compatible coolers are ideal for homes with fluctuating power supply or those aiming to reduce energy costs.
Factors to consider while purchasing the best window air coolers in 2025 during Amazon Sale 2025:
Room Size: Ensure the air cooler has the right capacity (liters) to efficiently cool your room. Larger spaces need more powerful coolers.
Cooling Pads: Look for coolers with high-quality wood wool or honeycomb cooling pads. These provide better evaporation and long-lasting cooling.
Air Delivery and Fan Speed: Choose a cooler with adjustable fan speeds and good air delivery (CFM) to ensure effective cooling.
Energy Consumption: Check if the cooler is inverter compatible or energy-efficient to reduce your electricity bill.
Motor Protection: Go for coolers with overload protection to safeguard the motor and increase its lifespan.
Portability and Placement: Ensure the cooler fits your window size and offers easy installation and portability.
Warranty: Opt for models with a solid warranty on the motor or other components to ensure long-term reliability.
Noise Levels: If you’re sensitive to noise, check the decibel levels to ensure a quiet operation.
Brand Reputation and Reviews: Check customer reviews and ratings to gauge performance and durability.
Sale Deals: Look for discounts, cashback offers, and no-cost EMI options during the Amazon Summer Sale 2025 for added value.
Top 3 features of the best window air coolers in 2025:
Best Window Air Coolers in 2025
Type of Cooling Pads
Technology Used
Special Features
Livpure GoodAir Window Air Cooler 52L
Wood wool
High Air Delivery
190W motor with overload protection, inverter compatible
FAQs on Amazon Summer Sale 2025 deals on best window air coolers
Are window air coolers included in Amazon Summer Sale 2025 deals?
Yes, top brands like Crompton, Orient, Kenstar, and Livpure are offering discounts on window air coolers.
Which are the best-selling window air coolers during this Amazon sale?
Models from Livpure, Crompton, and Orient Electric are among the best-selling coolers in the 50–56L range.
What are the best window air coolers to buy under ₹10,000 during the Amazon Summer Sale 2025?
Models like Orient Magicool Dx and Reliance 55L offer value features under ₹10,000 during the sale.
Can I compare the best window air coolers before buying on Amazon?
Yes, Amazon allows side-by-side comparison of specs, features, and buyer reviews for top window air coolers.
Do the best window air coolers on Amazon come with warranty and service support?
Most top-rated models like Livpure and Crompton come with 1 to 2 years warranty and doorstep service.
Disclaimer: At Hindustan Times, we help you stay up-to-date with the latest trends and products. Hindustan Times has an affiliate partnership, so we may get a part of the revenue when you make a purchase. We shall not be liable for any claim under applicable laws, including but not limited to the Consumer Protection Act, 2019, with respect to the products. The products listed in this article are in no particular order of priority.
ISRO Chairman V. Narayanan addresses a press conference on updates on the Gaganyaan Programme, at the National Media Centre in New Delhi on May 6, 2025.
| Photo Credit: ANI
The launch of India’s maiden human space flight — Gaganyaan — has been pushed to the first quarter of 2027, nearly five years later than the original schedule as it races to ace technologies for such complex projects.
The first uncrewed mission of the Gaganyaan project is expected to be launched later this year, which will be followed by two more similar missions in 2026, Indian Space Research Organisation (ISRO) Chairman V. Narayanan said at a press conference.
“The first crewed mission is targeted for the first quarter of 2027,” Mr. Narayanan said and added ISRO would send a half-humanoid robot — Vyommitra — as part of the uncrewed mission before sending astronauts to low-Earth orbit.
Prime Minister Narendra Modi announced the Gaganyaan project during his Independence Day address in 2018 and set a target of 2022 for achieving India’s maiden human space flight.
The project has run into several delays, partly due to the COVID-19 pandemic that affected the training of astronauts, and complexities of mastering the crucial technologies required for the mission.
The crewed mission was expected to take place in 2025 and later slotted for 2026. It has now been delayed to the first quarter of 2027.
Besides developing the human-rated launch vehicle for the Gaganyan mission, ISRO scientists have also built from scratch the Environment Control and Life Support System (ECLSS) for the mission, which will involve taking the astronauts to low-Earth orbit of 400km above the Earth for a few days and getting them back safely.
The ECLSS will help maintain cabin pressure, humidity, temperature, quality of air and personal hygiene management system in the spacecraft during the duration of the mission.
“It is a very complex process. For the first time we undertook this development. I want to say, 90 per cent of the work is completed and we are in the final phase of qualification,” Mr. Narayanan said.
If successful, India will become only the fourth country after Russia, the U.S. and China to independently launch humans into space.
Mr. Narayanan said space docking experiments comprising two satellites launched by a PSLV rocket in December were successful and ISRO was planning SPADEX-2.
A proposal on this will be presented to the government soon, he said.
He said judicious use of fuel during the ongoing SPADEX mission allowed ISRO to conduct more experiments in orbit that included circumnavigating one satellite around the other in March.
Scientists also demonstrated open and closed loop circumnavigation experiments that are considered as foundational technologies for in-orbit servicing of satellites for extension of mission life.
Mr. Narayanan said ISRO was hosting, along with the International Astronautical Federation, the Global Space Exploration Conference (GLEX 2025) from May 7-9, positioning India as a partner in space exploration.
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