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first, the the researchers introduce a synthetic polymer called PEDOT-S into the rose through its stem. The plant sucks up the polymer using the same vascular system (xylem) that transports water. Once inside xylem channels, the polymer self-assembles into an “wire” that conducts electrical signals, while still allowing water and nutrients to move around. By connecting these wires with naturally-occurring electrolytes in the plant’s tissue, the researchers are able to create an electrochemical transistor, as well as a digital logic gate, a basic component of computer systems.
The researchers also introduced a variant of PEDOT-S into the leaves, where it forms “pixels”; groups of electrochemical cells separated by leaf veins. When a voltage is applied, these pixels change color like a display.
Researchers in Sweden have created what they are calling an electronic plant, a machine-plant hybrid that has electrically conductive wiring integrated into it's internal structure. The research team sees a wide variety of applications for this development, including plants that can react to environmental changes, or plants that could act as electrical batteries, using photosynthesis as a power source.
This cyborg rose was made by taking an ordinary garden rose, and immersing the clipped stem into a solution of a liquid polymer that was drawn up into the plant's xylem vascular channels, the plant’s naturally-occurring internal fluid transport system. Once inside the channels, the polymer self-assembled into a conductive strand that could act as a wire that an electrical current could be sent through. These wires were then connected to naturally-occurring electrolytes in the plant’s tissue, and through that were able to create simple electrochemical transistors, a logic gate, and other electronic components.
For future electronic plant technologies, we identify integrated and distributed delivery and sensor devices as a particularly interesting e-Plant concept for feedback-regulated control of plant physiology, possibly serving as a complement to existing molecular genetic techniques used in plant science and agriculture. Distributed conducting wires and electrodes along the stems and roots and in the leaves are preludes to electrochemical fuel cells, charge transport, and storage systems that convert sugar produced from photosynthesis into electricity, in vivo.
Basic plant physiology and analogy to electronics. (A and B) A plant (A), such as a rose, consists of roots, branches, leaves, and flowers similar to (B) electrical circuits with contacts, interconnects, wires, and devices. (C) Cross section of the rose leaf. (D) Vascular system of the rose stem. (E) Chemical structures of PEDOT derivatives used.
Electronically conducting xylem wires. (A) Forming PEDOT-S:H wires in the xylem. A cut rose is immersed in PEDOT-S:H aqueous solution, and PEDOT-S:H is taken up and self-organizes along the xylem forming conducting wires. The optical micrographs show the wires 1 and 30 mm above the bottom of the stem (bark and phloem were peeled off to reveal the xylem). (B) Scanning electron microscopy (SEM) image of the cross section of a freeze-dried rose stem showing the xylem (1 to 5) filled with PEDOT-S:H. The inset shows the corresponding optical micrograph, where the filled xylem has the distinctive dark blue color of PEDOT. (C) SEM images (with corresponding micrograph on the left) of the xylem of a freeze-dried stem, which shows a hydrogel-like PEDOT-S structure.
Electrical characterization of xylem wires. (A) Schematic of conductivity measurement using Au probes as contacts. (B) I-V characteristics of PEDOT-S xylem wires of different lengths: L1 = 2.15 mm, L2 = 0.9 mm, and L3 = 0.17 mm. The inset shows resistance versus length/area and linear fit, yielding a conductivity of 0.13 S/cm.
PEDOT-infused leaves. (A) Vacuum infiltration. Leaf placed in PEDOTSS–NFC solution in a syringe with air removed. The syringe is pulled up, creating negative pressure and causing the gas inside the spongy mesophyll to be expelled. (B) When the syringe returns to standard pressure, PEDOTSS–NFC is infused through the stomata, filling the spongy mesophyll between the veins. (C and D) Photograph of the bottom (C) and cross section (D) of a pristine rose leaf before infiltration. (E and F) Photograph of the bottom (E) and cross section (F) of leaf after PEDOTSS–NFC infusion.
Leaf OECD. (A) Visualization of the electric field in the leaf-OECD via the induced electrochromic gradient directions [cf. study by Said et al. (30)]. (B) Electrical schematic representation of n-compartments modeling both electronic and ionic components of the current.
originally posted by: intrptr
a reply to: FamCore
Interestng. I thought they might have invented a carbon sequestration device that turns sunlight to sugar and carbon to wood. More like plant advertising signs or plant ads.
I see where this is gong, they can line the hiway with forest billboards for Coca Cola and Mc Donalds.
I suppose if it weren't harmful to the plant they could justify it but using nature to advertise for the society which is destroying it just seems very wrong to me
originally posted by: intrptr
a reply to: FamCore
I suppose if it weren't harmful to the plant they could justify it but using nature to advertise for the society which is destroying it just seems very wrong to me
Yah, not sure about this, but thats because I'm just a layman. I bet I can change a plants color with electrodes, too.
However, here we demonstrate the first example of electronic functionality added to plants and report integrated organic electronic analog and digital circuits manufactured in vivo. The vascular circuitry, components, and signals of R. floribunda plants have been intermixed with those of PEDOT structures.
originally posted by: FamCore
a reply to: laminatedsoul
You're not contributing anything relevant to this thread, why don't you conduct your food coloring experiment and make your own thread instead. THANKS