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Nano tape
Nano tape
Nano tape
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Commercially available nano tape.
Nano tape used to hang household items.

Nano tape, also called gecko tape (or commercially as Insanity Tape or Alien Tape) is a synthetic adhesive tape consisting of arrays of carbon nanotubes transferred onto a backing material of flexible polymer tape. These arrays are called synthetic setae and mimic the nanostructures found on the toes of a gecko; this is an example of biomimicry. The adhesion is achieved not with chemical adhesives, but via van der Waals forces, which are weak electric forces generated between two atoms or molecules that are very close to each other.[1][2]

Explanation

[edit]

Geckos show a remarkable ability to climb smooth vertical surfaces at high speeds, exhibiting both strong attachment and easy rapid removal, or shear adhesion, of their feet.[3]

On a gecko's foot, micrometer-sized elastic hairs called setae are split into nanometer-sized structures called spatulas. The shear adhesion is achieved by forming and breaking van der Waals forces between these microscopic structures and the substrate.[4]

Nano tapes mimic these structures with carbon nanotube bundles, which simulate setae and individual nanotubes, which simulate spatulas, to achieve macroscopic shear adhesion and to translate the weak van der Waals interactions into high shear forces. The shear adhesion allows the tape to be easily peeled off in the manner a gecko lifts its foot. Since the carbon nanotube arrays leave no residue on the substrate, the tape can be reused many times.[5]

History

[edit]

Nano tape is one of the first developments of synthetic setae, which arose from a collaboration between the Manchester Centre for Mesoscience and Nanotechnology, and the Institute for Microelectronics Technology in Russia. Work started in 2001 and two years later results were published in Nature Materials.[6]

The group prepared flexible fibers of polyimide as the synthetic setae structures on the surface of a 5 μm thick film of the same material using electron beam lithography and dry etching in an oxygen plasma. The fibres were 2 μm long, with a diameter of around 500 nm and a periodicity of 1.6 μm, and covered an area of roughly 1 cm2 (see figure on the left). Initially, the team used a silicon wafer as a substrate, but found that the tape's adhesive power increased by almost 1,000 times if they used a soft bonding substrate such as Scotch tape. This is because the flexible substrate yields a much higher ratio of the number of setae in contact with the surface over the total number of setae.[citation needed]

The result of this "gecko tape" was tested by attaching a sample to the hand of a 15 cm high plastic Spider-Man figure weighing 40 g, which enabled it to stick to a glass ceiling, as is shown in the figure. The tape, which had a contact area of around 0.5 square centimetres (50 mm2) with the glass, was able to carry a load of more than 100 grams (3.5 oz). However, the adhesion coefficient was only 0.06, which is low compared with real geckos (8~16).[citation needed]

Commercial use

[edit]

Commercial nano tape is usually sold as double-sided tape that is useful for hanging lightweight items, such as pictures and decorative items on smooth walls. Using superaligned carbon nanotubes, some nano tapes can stay sticky in extreme temperatures. [2]

[edit]
  • Gecko climbing a glass surface
    Gecko climbing a glass surface
  • Close view of a gecko's foot
    Close view of a gecko's foot
  • Micro and nano view of gecko's toe
    Micro and nano view of gecko's toe
  • Micro view of nano tape[6]
    Micro view of nano tape[6]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Nano tape

View on Grokipedia
from Grokipedia
Nano tape, also known as tape, is a synthetic dry that biomimics the hierarchical microstructure of foot setae, enabling strong, reversible primarily through van der Waals intermolecular forces without the need for chemical glues or surface wetting. It typically consists of micro- and nanofibrillar arrays, such as carbon nanotubes or polymer structures like and (PDMS), patterned onto a flexible substrate to maximize contact area and efficiency. This technology emerged from research in the early 2000s, with pioneering work demonstrating carbon nanotube-based tapes that achieved shear adhesion strengths up to 36 N/cm²—four times that of natural setae (~10 N/cm²)—while remaining reusable and residue-free over multiple cycles. Key properties include direction-dependent adhesion for easy detachment, high durability on smooth surfaces like or metal, and adaptability to various scales, from microgrippers to larger robotic pads. Fabrication methods, such as angled , micro-molding, and , allow precise control over fibril geometry (e.g., 5 µm diameter setae with 200–300 nm spatulae), optimizing performance for specific uses. Notable applications span , where gecko-inspired nano tapes enable wall-climbing robots like Stickybot to traverse vertical surfaces at speeds up to 4 cm/s, and biomedical fields, including non-invasive medical tapes for dressing or tissue manipulation that reduce pain upon removal. In space exploration, these adhesives support debris removal and astronaut mobility without contaminating environments, leveraging their vacuum-compatible and low-outgassing characteristics. Ongoing advancements focus on enhancing controllability, such as shear-induced detachment mechanisms, to broaden industrial and consumer adoption.

Fundamentals

Definition

Nano tape, also known as gecko tape, is a synthetic dry adhesive tape engineered with arrays of carbon nanotubes or synthetic setae that replicate the nanostructured hairs on gecko foot pads, facilitating strong adhesion through van der Waals forces without the use of liquids or residues. This biomimetic design allows for reversible, residue-free bonding to a variety of surfaces, distinguishing it from traditional pressure-sensitive adhesives that rely on chemical or viscous interactions. It is important to differentiate true nano tape from commonly mislabeled commercial products sold under the same name on platforms like Amazon, which are typically non-nanostructured acrylic gel-based double-sided tapes that achieve stickiness through viscoelastic deformation rather than . These gel tapes, while reusable and removable, do not incorporate nanoscale structures and thus do not embody the gecko-inspired principles. The core composition of nano tape includes vertically aligned multi-walled carbon nanotubes with an average diameter of 8 nm (two to five walls) and lengths of approximately 200–500 μm, transferred onto a flexible substrate such as a film or to form a tape-like structure. Alternatively, nanofibrils such as (PDMS) or are used to create synthetic setae arrays. This arrangement maximizes surface contact and enables the tape's dry adhesion properties, inspired by the hierarchical setae on feet that allow the animal to climb smooth surfaces effortlessly.

Biomimicry Principles

The foot pads of geckos are covered by millions of microscopic keratinous hairs called setae, each approximately 30–130 μm long and branching into hundreds of nanoscale spatula-shaped tips measuring about 200 nm in length. These spatulae, numbering in the billions across all four feet, conform intimately to surfaces and generate adhesion primarily through van der Waals intermolecular forces, allowing geckos to cling to diverse substrates ranging from smooth to rough bark without chemical residues. Nano tape draws directly from this biological model by employing synthetic arrays of nanofibrils or carbon nanotubes engineered to mimic the hierarchical of setae and spatulae, thereby maximizing the real contact area with surfaces to harness the same van der Waals forces for dry adhesion. Unlike traditional adhesives that rely on or residue-leaving mechanisms, these synthetic nanostructures enable clean, residue-free attachment by exploiting weak intermolecular attractions amplified through geometric scaling at the nanoscale. A core biomimicry principle in nano tape is directional , where the nanostructures provide strong shear resistance under loaded conditions—such as when weight is applied parallel to the surface—but exhibit weak normal pull-off forces when unloaded, permitting easy and reversible detachment without damage. This mirrors the gecko's ability to support 20 times its body weight on vertical or inverted surfaces while enabling rapid locomotion. Laboratory prototypes of nano tape have achieved strengths up to 36 N/cm² under shear, surpassing natural performance per unit area and demonstrating the efficacy of this bioinspired scaling.

Historical Development

Early Inspiration and Research

The development of nano tape, a synthetic dry inspired by biological systems, originated from early research into the remarkable climbing abilities of . In a foundational 2002 study, biologist Kellar Autumn and colleagues measured the adhesive force of individual gecko foot-hairs (), revealing that these nanoscale structures generate attachment primarily through intermolecular van der Waals forces, enabling reversible without liquids or residues. This work, building on 2000 measurements of single seta forces up to approximately 200 μN depending on conditions, shifted scientific focus from traditional wet adhesives to dry mechanisms, highlighting how millions of hierarchically structured setae on a gecko's toes maximize surface contact and force distribution across irregular surfaces. Autumn's team estimated that a single seta could support approximately 40 μN of force, underscoring the efficiency of van der Waals interactions at the nanoscale. This study provided direct evidence confirming van der Waals as the dominant adhesion mechanism in gecko setae, rejecting alternatives like forces and paving the way for biomimetic . The first synthetic efforts to replicate adhesion emerged between 2003 and 2005, with interdisciplinary teams at institutions like UC Berkeley and pioneering microfiber arrays as prototypes. In 2003, Metin at (in collaboration with Ronald S. Fearing at UC Berkeley) proposed fabrication techniques for synthetic gecko foot-hair micro/nano-structures using such as , creating dense arrays of vertical or angled fibers to mimic setae and achieve dry for potential robotic applications. These prototypes demonstrated initial directional properties, with fiber diameters around 0.3–10 μm and aspect ratios optimized to enhance compliance and contact area without collapsing under load. Concurrently, researchers at Stanford's and Dextrous Manipulation Lab (BDML), including Mark Cutkosky, explored similar -based microfiber designs in 2004–2005, focusing on anisotropic structures that allowed easy attachment and detachment, as detailed in early models of fibrillar adhesives for climbing robots. These efforts emphasized scalable methods, such as molding and , to produce arrays with densities up to billions of fibers per square centimeter, laying the groundwork for residue-free bonding. A notable milestone in 2007 (reported widely in 2008) came from Pulickel M. Ajayan's team at , who developed the first carbon-nanotube-based synthetic tape by transferring aligned nanotube arrays onto flexible backing. This tape achieved a of 36 N/cm²—nearly four times that of a natural gecko foot—while adhering to diverse surfaces like , , and Teflon, and exhibiting reversible, dry bonding without residue. The nanotube arrays, with lengths of 100–200 μm and diameters of 10–20 nm, amplified van der Waals forces through increased tip contact points, outperforming prototypes in durability and load-bearing under shear. Initial patents for nanotube adhesives were filed in the mid-2000s, emphasizing dry, residue-free for practical applications. These filings protected innovations in nanotube alignment and transfer processes, prioritizing van der Waals-dominated interfaces over chemical glues.

Key Advancements and Milestones

During the , significant progress was made in nano tape development through enhancements in the alignment of nanostructures, particularly carbon nanotubes and synthetic , to achieve superior . Vertically aligned carbon nanotube emerged as a key innovation, demonstrating shear strengths of up to 100 N/cm²—substantially higher than the natural gecko's approximately 10 N/cm²—via optimized fabrication techniques that improved contact efficiency and load distribution. Parallel efforts shifted toward synthetic polymers, such as and , to lower costs compared to nanotube-based materials while maintaining robust performance through scalable nanocasting methods. A pivotal milestone in commercialization arrived in 2015, when nanoGriptech—a spinoff—launched Setex™, the first market-ready gecko-inspired dry adhesive prototypes tailored for industrial uses, including robotic handling in and automotive assembly, where several square inches could support hundreds of pounds. From 2023 to 2025, European innovations advanced reusability in nano tape applications, exemplified by Gecko Nanoplast fasteners from firms like those in , which combine nanostructured mimicking setae with Van der Waals forces to enable hundreds of attachment-detachment cycles on smooth surfaces without performance degradation or residue. Research in 2022 highlighted hybrid core-shell designs for tapes, integrating rigid nanotube-inspired cores with soft polymeric shells to boost on rough surfaces by up to 10 times relative to uniform structures, achieving 14.92 kPa on with 23.6 μm roughness via an electrically responsive self-growth process.

Adhesive Properties

Mechanism of Adhesion

The primary mechanism of in nano tape relies on van der Waals forces, which are weak intermolecular attractions amplified through extensive surface contact provided by arrays of carbon nanotubes or similar nanostructures. These nanotube arrays mimic the hierarchical fibrillar structures found in setae, enabling the tape to achieve intimate molecular contact with diverse surfaces without the need for chemical residues or moisture. The effective contact area is dramatically increased—by factors up to 10^6 compared to flat surfaces in optimized designs—due to the high and of the nanotubes, which distribute load across numerous nanoscale contact points and reduce stress concentrations that would otherwise limit on smooth or irregular substrates. In the adhesion process, the compliant nanotube arrays conform dynamically to surface irregularities, such as microscopic roughness, allowing the tips of the nanotubes to come within angstroms of the substrate where van der Waals forces operate effectively. This conformation maximizes the number of molecular interactions, summing the minuscule individual attractions (on the order of 10^{-7} N per contact) into substantial macroscopic forces capable of supporting significant loads. Release is achieved through peeling, which progressively reduces the contact area by lifting the nanotubes at an angle, thereby diminishing the collective van der Waals interactions and enabling reversible detachment with minimal energy expenditure. Nano tape exhibits pronounced in , with often exceeding normal pull-off strength by up to 100 times, a property that facilitates gecko-like directional attachment and climbing by promoting engagement under tangential loading while allowing easy release under normal tension. This shear-normal disparity arises from the tilted or aligned orientation of the nanotubes, which aligns van der Waals forces with frictional resistance during sliding but collapses contacts under direct perpendicular pull. Performance can vary depending on the material, such as carbon nanotubes versus polymers like PDMS, and fabrication techniques.

Performance Metrics

Nano tape exhibits impressive adhesion strengths in laboratory settings, with pull-off forces typically ranging from 3 to 10 N/cm², enabling secure attachment to smooth surfaces without permanent bonding. Shear adhesion strengths are notably higher, often achieving up to 50 to 80 N/cm² in optimized nanostructures, which allows nano tape to support substantial loads in parallel directions. These metrics surpass those of natural setae in some cases, highlighting the of synthetic van der Waals-based . Durability tests demonstrate that nano tape can withstand up to 10,000 attachment-detachment cycles in controlled environments, retaining over 50% of initial strength despite minor deformation. Reusability is enhanced by its dry mechanism, which leaves no chemical residue and allows cleaning with and to restore performance. However, on dusty surfaces, performance can degrade due to contaminant accumulation, though self-cleaning properties allow recovery. Environmental testing reveals effective operation across ranges, such as 12°C to 32°C, where remains stable without significant loss. Performance diminishes on wet or oily surfaces due to disrupted intermolecular contacts, particularly on hydrophilic substrates. Recent benchmarks as of 2024 for hybrid tapes indicate strengths up to 83 kPa (approximately 8 N/cm² or 0.8 kg/cm² load-bearing on substrates), demonstrating superior reversibility compared to conventional tapes.

Applications

Scientific and Industrial Uses

In , -inspired nano tape enables climbing robots to adhere to vertical and inverted surfaces for applications such as search-and-rescue operations. For instance, DARPA's Z-Man program developed prototypes in the mid-2010s that allowed human-scale climbing on glass walls using mimicking foot hairs, demonstrating adhesion strengths sufficient for body weight support without residue. These adhesives have also been integrated into soft grippers, allowing robots to handle delicate objects like glass or biological tissues through controllable van der Waals forces. Stanford University's StickyBot platform has tested -inspired adhesives for wall traversal on smooth surfaces. In medical applications, nano tape shows promise for residue-free attachment in wound dressings and micro-surgery tools. Researchers at MIT developed a gecko-inspired patch in the late 2000s that conforms to wet, dynamic tissues for closing wounds without sutures, exhibiting shear adhesion up to 3 N/cm² on porcine intestine. More recent trials in the early , including a 2024 study on bio-inspired surgical adhesives, have explored their use in minimally invasive procedures, where the tapes provide reversible bonding to tissues during operations, reducing inflammation risks compared to traditional glues. Industrially, gecko-inspired adhesives have potential in and . In , these tapes enable flexible circuit bonding, allowing attachment of components to curved or stretchable substrates without chemical residues, as demonstrated in prototypes for wearable devices with tunable via microstructured arrays. A notable implementation occurred in with NASA's integration of gecko-inspired nano tape for applications, particularly in modular repairs. The technology, tested via gecko grippers on the , leverages vacuum-compatible for attaching tools to surfaces during extravehicular activities, enabling debris mitigation and on-orbit servicing with minimal detachment forces. This approach utilizes the tapes' high in microgravity simulations to secure repairs without traditional fasteners. Recent 2025 research has advanced gecko-inspired grippers for ultra-delicate handling in , supporting loads while minimizing damage to objects.

Commercial and Consumer Products

Commercial and consumer products featuring true , defined as adhesives with synthetic nanostructures mimicking setae, remain niche due to high production costs and specialized manufacturing. Setex Technologies, formerly nanoGriptech, launched the first commercially available -inspired dry in , utilizing microstructured for residue-free, reusable bonding on smooth surfaces. This tape, available in variants like DA 910 for high-strength applications, offers shear of 30-40 N/cm², enabling consumer uses such as mounting tools or eyeglass nose pads that hold several kilograms without glue. Other brands, including geCKo Materials and Gottlieb Binder's Gecko Tape, market similar nanostructured products for household gripping and fastening, emphasizing durability over thousands of cycles. In contrast, many products labeled "nano tape" in mainstream retail are misleading, relying on conventional or acrylic rather than nanostructures. For instance, Duck Max Strength Nano-Grab, widely sold since the early 2020s, uses a clear with micro-sphere particles for reusable mounting, holding up to 20 lbs per 5 ft roll on non-porous surfaces, but lacks true nanotube or setae arrays. Similarly, Realth and generic Amazon variants employ butyl-acrylic for traceless in home decor and crafts, often marketed with claims despite compositions confirmed as non-nanostructured. These -based tapes dominate consumer availability, appealing for their low cost ($5-15 per roll) and ease of use in temporary fixes like hanging posters or securing rugs. The broader "nano tape" market reached approximately $1.49 billion globally in , driven largely by these affordable gel products for DIY and decor applications. Authentic nanostructured versions, however, constitute a small fraction, limited to high-end niches with prices of $10-50 per small roll due to complex fabrication. Consumer interest in reusable mounting tapes surged with viral trends from 2023 onward, featuring crafts like nano tape bubbles and squishies, though these often highlight variants misattributed as advanced . True gecko-inspired tapes offer superior repeatability for specialized consumer tools, but alternatives prevail for everyday versatility.

Challenges and Future Prospects

Limitations and Drawbacks

Despite significant advances in nanostructured adhesives, nano tape based on (CNT) arrays faces substantial scalability challenges in . Achieving uniform nanotube alignment and remains difficult due to variations in growth conditions and alignment techniques. Additionally, fabrication costs for CNT-based tapes are elevated, primarily from specialized synthesis and transfer methods required for micropatterned arrays. Practical limitations further restrict nano tape's utility. These adhesives are highly sensitive to contamination, where dust or particulates can significantly reduce strength by interfering with van der Waals contacts at the nanoscale tips, though recovery to near-original levels is possible after . They perform optimally only on smooth, clean surfaces, with performance dropping sharply on rough or irregular substrates due to incomplete contact formation. Moreover, repeated use leads to , with degrading after 100-500 cycles from mechanical abrasion and tip blunting, as observed in CNT array tests. Environmental and health concerns add to the drawbacks. Potential shedding of nanotubes during use or degradation raises risks, with 2022 studies highlighting respiratory and similar to in animal models exposed to airborne CNTs. The underlying substrates are typically non-biodegradable, contributing to long-term waste issues in applications. Economically, nano tape production costs are higher than those of conventional adhesive tapes, confining adoption to niche, high-value markets like rather than broad consumer use. These factors, including limited cycle as noted in performance metrics, underscore the need for improved in real-world scenarios.

Emerging Developments

Recent research has advanced gecko-inspired nano tapes by integrating self-sensing capabilities, enabling real-time monitoring of forces and states through capacitive sensors embedded in porous microstructures that mimic gecko setae. These adhesives achieve strong van der Waals-based attachment on irregular surfaces while providing feedback for intelligent control, addressing preload sensitivity in non-ideal conditions. Innovations in fabrication techniques include overcuring-induced anisotropic microstructures via digital light processing (DLP) 3D printing, allowing the creation of tilted pillar arrays that emulate spatula tips for reversible . This method transforms printing defects into functional features, producing soft actuators capable of handling delicate objects like silicon wafers with up to 96.78% recovery after cleaning and a 5.9:1 gripping-to-releasing ratio. Similar approaches have been applied to magnetic soft actuators with setae arrays, enhancing controllable in through double-casting with (PDMS). Hybrid materials combining carbon nanotubes and nanoplatelets are emerging to boost mechanical durability in nano tape composites, with studies showing synergistic enhancements in electrical and thermal properties for polymer-based adhesives. These hybrids offer potential for twice the tensile strength in fibrillar structures compared to single-component systems, supporting applications in . In biomedical contexts, tunable soft bioadhesives inspired by adhesion provide secure anchoring for chronic implants, with adjustable modulus and rapid curing to match tissue compliance and promote integration without initially. Ultrathin bio-tapes (8 μm thick) enable elastic, self-adhesive on stents, demonstrating controlled release and in wet environments. Eco-friendly developments include biodegradable micro-nanofiber tapes using modified elastomers, achieving 100% antibacterial efficacy, unidirectional moisture permeability of 6,589.40 g·m⁻²·d⁻¹, and full degradation without skin irritation, ideal for sustainable dressings. Cellulose nanofibers are also being incorporated into flexible, transparent substrates for moisture-sensitive adhesives, enhancing renewability. Research trends leverage AI for optimizing nanofabrication processes, such as inverse and additive , to reduce production costs by streamlining design and synthesis in gecko-like structures, with projections for significant gains by 2030. Future directions emphasize adhesives for lightweight rover attachments and self-healing prototypes, building on ETH Zurich's room-temperature self-healing silicones adaptable to dynamic nano tape environments. As of 2025, advancements include toe pad-inspired robotic grippers enabling rapid switching in under 0.5 seconds for handling varied objects, and electroadhesive-enhanced skins that combine forces for superior .

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