Connect with us

Tech

3D-printed smart materials boost tactile sensor performance in wearable devices

Published

on

3D-printed smart materials boost tactile sensor performance in wearable devices


The proposed metamaterial-based tactile sensing technology is expected to revolutionize the design of wearable devices and health monitoring. Credit: Dr. Soonjae Pyo / SeoulTech

Tactile sensors are widely used in robotics, prosthetics, wearable devices, and health care monitoring. These devices detect and convert external stimuli such as pressure and force into electrical signals, facilitating effective environmental detection.

Scientists have made extensive efforts to improve the performance of in terms of sensing range and sensitivity.

In this context, mechanical metamaterials are highly promising. Specifically, auxetic (AMMs)—possessing a negative Poisson’s ratio—enable inward contraction and localized strain concentration upon compression. These counterintuitive behaviors render them lucrative options for designing sensors and actuators with excellent properties.

However, existing AMM technology suffers from fabrication and integration challenges.

Addressing this knowledge gap, a team of researchers from the Seoul National University of Science and Technology, led by Mr. Mingyu Kang, the first author of the study and a Master’s course student in the Department of Mechanical Design and Robot Engineering, and including Dr. Soonjae Pyo, an Associate Professor in the Department of Mechanical System Design Engineering, have proposed a novel 3D AMM-based tactile sensing platform based on a cubic lattice with spherical voids and fabricated using digital light processing-based 3D printing.

Their findings are published in the journal Advanced Functional Materials.

The researchers explored the tactile sensing platform, utilizing 3D-printed auxetic metamaterials in both capacitive and piezoresistive sensing modes. While the sensor responds to pressure via electrode spacing and dielectric distribution modulation in the first mode, the latter mode leverages a conformally coated network of carbon nanotubes that alters resistance under load.

“The unique negative Poisson’s ratio behavior utilized by our technology induces inward contraction under compression, concentrating strain in the sensing region and enhancing sensitivity,” said Mr. Kang.

“Beyond this fundamental mechanism, our auxetic design further strengthens sensor performance in three critical aspects: sensitivity enhancement through localized strain concentration, exceptional performance stability when embedded within confined structures, and crosstalk minimization between adjacent sensing units.

“Unlike conventional porous structures, this design minimizes lateral expansion, improving wearability and reducing interference when integrated into devices such as smart insoles or robotic grippers.

“Furthermore, the use of digital light processing-based 3D printing enables precise structural programming of sensor performance, allowing geometry-based customization without changing the base material.”

The team showcased two proof-of-concept scenarios highlighting the novelty of their work: a tactile array for spatial pressure mapping and object classification, as well as a wearable insole system with gait pattern monitoring and pronation type detection capabilities.

According to Dr. Pyo, “The proposed sensor platform can be integrated into smart insoles for gait monitoring and pronation analysis, robotic hands for precise object manipulation, and wearable health monitoring systems that require comfortable sensing without disrupting daily life.

“Importantly, the auxetic structure preserves its sensitivity and stability even when confined within rigid housings, such as insole layers, where conventional porous lattices typically lose performance.

“Its scalability and compatibility with various transduction modes also make it suitable for pressure mapping surfaces, rehabilitation devices, and human-robot interaction interfaces that require high sensitivity and mechanical robustness.”

In the next decade, auxetic-structured 3D-printed tactile sensors could form the backbone of next-generation wearable electronics, enabling continuous, high-fidelity monitoring of human movement, posture, and health metrics.

Their structural adaptability and material independence could drive the creation of custom-fit, application-specific sensors for personalized medicine, advanced prosthetics, and immersive haptic feedback systems.

As additive manufacturing becomes more accessible, mass-customized tactile interfaces with programmable performance may become standard in consumer products, health care, and robotics.

More information:
Mingyu Kang et al, Additively Manufactured 3D Auxetic Metamaterials for Structurally Guided Capacitive and Resistive Tactile Sensing, Advanced Functional Materials (2025). DOI: 10.1002/adfm.202509704

Citation:
3D-printed smart materials boost tactile sensor performance in wearable devices (2025, August 29)
retrieved 29 August 2025
from https://techxplore.com/news/2025-08-3d-smart-materials-boost-tactile.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





Source link

Continue Reading
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Tech

A New Attack Lets Hackers Steal 2-Factor Authentication Codes From Android Phones

Published

on

A New Attack Lets Hackers Steal 2-Factor Authentication Codes From Android Phones


Android devices are vulnerable to a new attack that can covertly steal two-factor authentication codes, location timelines, and other private data in less than 30 seconds.

The new attack, named Pixnapping by the team of academic researchers who devised it, requires a victim to first install a malicious app on an Android phone or tablet. The app, which requires no system permissions, can then effectively read data that any other installed app displays on the screen. Pixnapping has been demonstrated on Google Pixel phones and the Samsung Galaxy S25 phone and likely could be modified to work on other models with additional work. Google released mitigations last month, but the researchers said a modified version of the attack works even when the update is installed.

Like Taking a Screenshot

Pixnapping attacks begin with the malicious app invoking Android programming interfaces that cause the authenticator or other targeted apps to send sensitive information to the device screen. The malicious app then runs graphical operations on individual pixels of interest to the attacker. Pixnapping then exploits a side channel that allows the malicious app to map the pixels at those coordinates to letters, numbers, or shapes.

“Anything that is visible when the target app is opened can be stolen by the malicious app using Pixnapping,” the researchers wrote on an informational website. “Chat messages, 2FA codes, email messages, etc. are all vulnerable since they are visible. If an app has secret information that is not visible (e.g., it has a secret key that is stored but never shown on the screen), that information cannot be stolen by Pixnapping.”

The new attack class is reminiscent of GPU.zip, a 2023 attack that allowed malicious websites to read the usernames, passwords, and other sensitive visual data displayed by other websites. It worked by exploiting side channels found in GPUs from all major suppliers. The vulnerabilities that GPU.zip exploited have never been fixed. Instead, the attack was blocked in browsers by limiting their ability to open iframes, an HTML element that allows one website (in the case of GPU.zip, a malicious one) to embed the contents of a site from a different domain.

Pixnapping targets the same side channel as GPU.zip, specifically the precise amount of time it takes for a given frame to be rendered on the screen.



Source link

Continue Reading

Tech

A Plan to Rebuild Gaza Lists Nearly 30 Companies. Many Say They’re Not Involved

Published

on

A Plan to Rebuild Gaza Lists Nearly 30 Companies. Many Say They’re Not Involved


The GHF was created in early 2025, having emerged from conversations between individuals such as Eisenberg, Tancman, and consultant Yotam HaCohen—who, like Tancman, is a part of COGAT. They were reportedly concerned that Hamas was stealing aid meant for civilians, however, an analysis by a USAID agency found no evidence of this.

Through conversations with Israeli officials, GHF began to receive on-ground support from two American companies: Safe Reach Solutions, run by former CIA officer Philip Reilly, and UG Solutions, run by former Green Beret Jameson Govoni. Neither responded to requests for comment.

GHF is currently run by Johnnie Moore Jr., a former Trump official, and evangelical Christian. It was originally headed by Jake Wood, a former Marine who founded Team Rubicon, an organization that deploys veterans to disaster zones. Wood resigned after about three months, claiming that he couldn’t oversee aid distribution at GHF while “adhering to the humanitarian principles of humanity, neutrality, impartiality, and independence.”

Alternative Paths

The GREAT Trust presentation is not the only business-minded plan for redeveloping Gaza.

Former UK prime minister Tony Blair has been linked to the development of an alternative plan that was leaked to the Guardian and Haaretz. Among other things, the plan proposes creating a Gaza Investment Promotion and Economic Development Authority, which would be a “commercially driven authority, led by business professionals and tasked with generating investable projects,” according to various reports of the plan, but it does not mention any specific companies.

Another group called “Palestine Emerging”—made up of an international collective of business executives and consultants—also created a post-war Gaza blueprint. It does not get into detail about investments from businesses abroad, but argues that there will have to be a “phased development strategy” in the short, medium, and long-term in order to rebuild Gaza’s housing and economy. The blueprint also mentions that there were “about 56,000 businesses in Gaza” before October 7, 2023, which were subject to “historical constraints” that limited their success.



Source link

Continue Reading

Tech

Interstellar Comet 3I/ATLAS Is Spewing Water Like a Cosmic Fire Hydrant

Published

on

Interstellar Comet 3I/ATLAS Is Spewing Water Like a Cosmic Fire Hydrant


Comet 3I/Atlas continues to be full of surprises. As well as being only the third interstellar object ever detected, new analysis shows it is producing hydroxyl (OH) emissions, with these compounds betraying the presence of water on its surface. This discovery was made by a team of researchers at Auburn University in Alabama using NASA’s Neil Gehrels Swift Observatory, and was described in a study published in The Astrophysical Journal Letters.

Hydroxyl compounds are detectable via the ultraviolet signature they produce. But on Earth, a lot of UV wavelengths are blocked by the atmosphere, which is why the researchers had to use the Neil Gehrels Swift Observatory—a space telescope free from interference experienced by observatories on Earth.

Water is present in virtually every comet seen in the solar system, so much so that the chemical and physical reactions of water are used to measure, catalog, and track these celestial objects and how they react to the heat of the sun. Finding it on 3I/ATLAS means being able to study its characteristics using the same scale used for regular comets, and this information could in future be useful data for studying the processes of comets that originate in other star systems as well.

“When we detect water—or even its faint ultraviolet echo, OH—from an interstellar comet, we’re reading a note from another planetary system,” said Dennis Bodewits, an Auburn University physicist who collaborated on the research, in a press statement. “It tells us that the ingredients for life’s chemistry are not unique to our own.”

Comets are frozen hunks of rock, gases, and dust that usually orbit stars (the exceptions being the three interstellar objects found so far). When they’re far away from a star, they’re completely frozen, but as they get closer, solar radiation causes their frozen elements to heat up and sublimate—turn from solid into gas—with some of this material emitted from the comet’s nucleus thanks to the star’s energy, forming a “tail.”

But with 3I/ATLAS, data collected revealed an unexpected detail: OH production by the comet was already happening far away from the sun—when the comet was more than three times farther from the sun than the Earth—in a region of the solar system where temperatures normally aren’t sufficient to easily produce the sublimation of ice. Already at that distance, however, 3I/ATLAS was leaking water at the rate of about 40 kilograms per second, a flow comparable—the study authors explain—to that of a “hydrant at maximum power.”

This detail would seem to indicate a more complex structure than what is usually observed in comets in the solar system. It could, for example, be explained by the presence of small fragments of ice detaching from the comet’s nucleus, and which are then vaporized by the heat of sunlight, going on to feed a gaseous cloud that surrounds the celestial body. This is something that has so far been observed only in a small number of extremely distant comets, and which could provide valuable information about the processes from which 3I/ATLAS originated.

“Every interstellar comet so far has been a surprise,” said Zexi Xing, an Auburn University researcher and coauthor of the discovery, in a press statement. “‘Oumuamua was dry, Borisov was rich in carbon monoxide, and now ATLAS is giving up water at a distance where we didn’t expect it. Each one is rewriting what we thought we knew about how planets and comets form around stars.”

This story originally appeared on WIRED Italia and has been translated from Italian.



Source link

Continue Reading

Trending