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Bioinspired tilt-angle fabricated structure gradient fibers: micro-drops fast transport in a long-distance.

Chen Y, Wang L, Xue Y, Jiang L, Zheng Y - Sci Rep (2013)

Bottom Line: Issues of surfaces, e.g., inspired from beetle's back, spider silk, cactus stem, etc., become the active area of research on designing novel materials in need of human beings to acquire fresh water resource from air.Here, we report the ability of micro-drop transport in a long distance on a bioinspired Fibers with Gradient Spindle-knots (BFGS), which are fabricated by tilt angle dip-coating method.The micro-drop of ~0.25 μL transports in distance of ~5.00 mm, with velocity of 0.10-0.22 m s⁻¹ on BFGS.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, 100191 (P. R. China) [2].

ABSTRACT
Issues of surfaces, e.g., inspired from beetle's back, spider silk, cactus stem, etc., become the active area of research on designing novel materials in need of human beings to acquire fresh water resource from air. However, the design of materials on surface structure is little achieved on controlling of micro-scale drop transport in a long distance. Here, we report the ability of micro-drop transport in a long distance on a bioinspired Fibers with Gradient Spindle-knots (BFGS), which are fabricated by tilt angle dip-coating method. The micro-drop of ~0.25 μL transports in distance of ~5.00 mm, with velocity of 0.10-0.22 m s⁻¹ on BFGS. It is attributed to the multi-level cooperation of the release energy of drop coalescence along the gradient spindle-knots, in addition to capillary adhesion force and continuous difference of Laplace pressure, accordingly, water drops are driven to move fast directionally in a long distance on BFGS.

No MeSH data available.


Related in: MedlinePlus

Water direction tendency coalescences in normal sequence and reverse sequence.(a), In normal sequence water drops coalescence with the process of (D1 + D2) + D3. The drop D1 coalesces with drop D2 to form Drop D(1 + 2), and it moves towards bigger spindle-knots. With the water drops growing, drop D(1 + 2) is merging with drop D3 to form drop D(1 + 2) + 3. The length of movement (La) is ~2.80 mm with ~26.8 ms. (b), The reverse sequence of water drops coalescence. The drop D2′ and D3′ firstly combine together form the drop D(2′ + 3′). With the drops growing, the drop D1′ moves towards to the right due to the first mode (virtual frame) and coalesces with drop D(2′ + 3′) to form Drop D (2′ + 3′) + 1′. The length of movement (Lb) is ~2.46 mm with ~968.4 ms. Scale bars, 500 μm.
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f4: Water direction tendency coalescences in normal sequence and reverse sequence.(a), In normal sequence water drops coalescence with the process of (D1 + D2) + D3. The drop D1 coalesces with drop D2 to form Drop D(1 + 2), and it moves towards bigger spindle-knots. With the water drops growing, drop D(1 + 2) is merging with drop D3 to form drop D(1 + 2) + 3. The length of movement (La) is ~2.80 mm with ~26.8 ms. (b), The reverse sequence of water drops coalescence. The drop D2′ and D3′ firstly combine together form the drop D(2′ + 3′). With the drops growing, the drop D1′ moves towards to the right due to the first mode (virtual frame) and coalesces with drop D(2′ + 3′) to form Drop D (2′ + 3′) + 1′. The length of movement (Lb) is ~2.46 mm with ~968.4 ms. Scale bars, 500 μm.

Mentions: Furthermore, we select a gradient fiber with three different spindle-knots (i.e., height of ~43 μm, ~130 μm, ~217 μm; width of ~152 μm, ~435 μm, and ~565 μm, respectively; the largest pitch is ~1.1 mm). Water directional movement process is recorded by using CCD. In process of water drop movement as shown in Figure 4, it is found that the direction tendency of drop coalescence can also further be normal sequence and reverse sequence. In normal sequence (as shown in Fig. 4a), the observation is focused on behaviors of three water drops with volumes: ΩD1 < ΩD2 < ΩD3 (~0.40 μL, ~0.63 μL, ~1.24 μL, respectively) (see Fig. 4a). The process of water drops coalescence is in manner of (D1 + D2) + D3. In details, the drop D1 coalesces with drop D2 at ~1.4 ms. Drop D(1 + 2) moves towards bigger spindle-knots and is hanging on the middle spindle-knot via the second mode (at ~9.8 ms). With the water drops growing, drop D(1 + 2) is merging with drop D3 at ~11.2 ms. Due to the biggest spindle-knot with the most capillary force, the drop D(1 + 2) + 3 is hanging stably on the biggest one at ~26.8 ms. The length of movement (La) is ~2.8 mm at the whole coalescence process. In reverse sequence of droplet coalescence, the observation is focused on behaviors of three water drops with volumes: ΩD1′ ≈ ΩD2′ ≈ ΩD3′ (≈0.67 μL) (see Fig. 4b). The process of water drop coalescence is in manner of (D2′ + D3′) + D1′. In details, at ~2.80 ms, the drop D2′ and D3′ firstly combine together. The drop D(2′ + 3′) finally hangs stably on the biggest spindle-knots at ~8.4 ms. With the drops growing, the drop D1′ moves towards to the right due to the first way at ~960.4 ms. As the virtual frames are shown, the drop D1′ moves and hangs on the middle spindle-knot. At ~967.0 ms, the drop D1′ is merging with drop D(2′ + 3′). Drop D(2′ + 3′) + 1′ is hanging on the biggest spindle-knot at ~968.4 ms. The length of movement (Lb) is ~2.46 mm at the whole coalescence process. Even though the two processes of coalescence have the same result that three water drops coalesce into a bigger one with direction movement at the gradient spindle-knot fiber and the transport distances are no obvious disparity (~2.80 mm in normal sequence and ~2.46 mm in reverse sequence), but the reverse sequence spends more longer time (~968.4 ms) than the normal sequence (~26.8 ms). The speed of normal sequence transport (~0.105 m s−1) is almost 42 times more than that of reverse sequence transport (~0.0025 m s−1) on average. It illustrates that the gradient structure existence of spindle-knots on the fiber decides the action of transport and the volumes and position of water drops effect the speed of transport.


Bioinspired tilt-angle fabricated structure gradient fibers: micro-drops fast transport in a long-distance.

Chen Y, Wang L, Xue Y, Jiang L, Zheng Y - Sci Rep (2013)

Water direction tendency coalescences in normal sequence and reverse sequence.(a), In normal sequence water drops coalescence with the process of (D1 + D2) + D3. The drop D1 coalesces with drop D2 to form Drop D(1 + 2), and it moves towards bigger spindle-knots. With the water drops growing, drop D(1 + 2) is merging with drop D3 to form drop D(1 + 2) + 3. The length of movement (La) is ~2.80 mm with ~26.8 ms. (b), The reverse sequence of water drops coalescence. The drop D2′ and D3′ firstly combine together form the drop D(2′ + 3′). With the drops growing, the drop D1′ moves towards to the right due to the first mode (virtual frame) and coalesces with drop D(2′ + 3′) to form Drop D (2′ + 3′) + 1′. The length of movement (Lb) is ~2.46 mm with ~968.4 ms. Scale bars, 500 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3795351&req=5

f4: Water direction tendency coalescences in normal sequence and reverse sequence.(a), In normal sequence water drops coalescence with the process of (D1 + D2) + D3. The drop D1 coalesces with drop D2 to form Drop D(1 + 2), and it moves towards bigger spindle-knots. With the water drops growing, drop D(1 + 2) is merging with drop D3 to form drop D(1 + 2) + 3. The length of movement (La) is ~2.80 mm with ~26.8 ms. (b), The reverse sequence of water drops coalescence. The drop D2′ and D3′ firstly combine together form the drop D(2′ + 3′). With the drops growing, the drop D1′ moves towards to the right due to the first mode (virtual frame) and coalesces with drop D(2′ + 3′) to form Drop D (2′ + 3′) + 1′. The length of movement (Lb) is ~2.46 mm with ~968.4 ms. Scale bars, 500 μm.
Mentions: Furthermore, we select a gradient fiber with three different spindle-knots (i.e., height of ~43 μm, ~130 μm, ~217 μm; width of ~152 μm, ~435 μm, and ~565 μm, respectively; the largest pitch is ~1.1 mm). Water directional movement process is recorded by using CCD. In process of water drop movement as shown in Figure 4, it is found that the direction tendency of drop coalescence can also further be normal sequence and reverse sequence. In normal sequence (as shown in Fig. 4a), the observation is focused on behaviors of three water drops with volumes: ΩD1 < ΩD2 < ΩD3 (~0.40 μL, ~0.63 μL, ~1.24 μL, respectively) (see Fig. 4a). The process of water drops coalescence is in manner of (D1 + D2) + D3. In details, the drop D1 coalesces with drop D2 at ~1.4 ms. Drop D(1 + 2) moves towards bigger spindle-knots and is hanging on the middle spindle-knot via the second mode (at ~9.8 ms). With the water drops growing, drop D(1 + 2) is merging with drop D3 at ~11.2 ms. Due to the biggest spindle-knot with the most capillary force, the drop D(1 + 2) + 3 is hanging stably on the biggest one at ~26.8 ms. The length of movement (La) is ~2.8 mm at the whole coalescence process. In reverse sequence of droplet coalescence, the observation is focused on behaviors of three water drops with volumes: ΩD1′ ≈ ΩD2′ ≈ ΩD3′ (≈0.67 μL) (see Fig. 4b). The process of water drop coalescence is in manner of (D2′ + D3′) + D1′. In details, at ~2.80 ms, the drop D2′ and D3′ firstly combine together. The drop D(2′ + 3′) finally hangs stably on the biggest spindle-knots at ~8.4 ms. With the drops growing, the drop D1′ moves towards to the right due to the first way at ~960.4 ms. As the virtual frames are shown, the drop D1′ moves and hangs on the middle spindle-knot. At ~967.0 ms, the drop D1′ is merging with drop D(2′ + 3′). Drop D(2′ + 3′) + 1′ is hanging on the biggest spindle-knot at ~968.4 ms. The length of movement (Lb) is ~2.46 mm at the whole coalescence process. Even though the two processes of coalescence have the same result that three water drops coalesce into a bigger one with direction movement at the gradient spindle-knot fiber and the transport distances are no obvious disparity (~2.80 mm in normal sequence and ~2.46 mm in reverse sequence), but the reverse sequence spends more longer time (~968.4 ms) than the normal sequence (~26.8 ms). The speed of normal sequence transport (~0.105 m s−1) is almost 42 times more than that of reverse sequence transport (~0.0025 m s−1) on average. It illustrates that the gradient structure existence of spindle-knots on the fiber decides the action of transport and the volumes and position of water drops effect the speed of transport.

Bottom Line: Issues of surfaces, e.g., inspired from beetle's back, spider silk, cactus stem, etc., become the active area of research on designing novel materials in need of human beings to acquire fresh water resource from air.Here, we report the ability of micro-drop transport in a long distance on a bioinspired Fibers with Gradient Spindle-knots (BFGS), which are fabricated by tilt angle dip-coating method.The micro-drop of ~0.25 μL transports in distance of ~5.00 mm, with velocity of 0.10-0.22 m s⁻¹ on BFGS.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, 100191 (P. R. China) [2].

ABSTRACT
Issues of surfaces, e.g., inspired from beetle's back, spider silk, cactus stem, etc., become the active area of research on designing novel materials in need of human beings to acquire fresh water resource from air. However, the design of materials on surface structure is little achieved on controlling of micro-scale drop transport in a long distance. Here, we report the ability of micro-drop transport in a long distance on a bioinspired Fibers with Gradient Spindle-knots (BFGS), which are fabricated by tilt angle dip-coating method. The micro-drop of ~0.25 μL transports in distance of ~5.00 mm, with velocity of 0.10-0.22 m s⁻¹ on BFGS. It is attributed to the multi-level cooperation of the release energy of drop coalescence along the gradient spindle-knots, in addition to capillary adhesion force and continuous difference of Laplace pressure, accordingly, water drops are driven to move fast directionally in a long distance on BFGS.

No MeSH data available.


Related in: MedlinePlus