Progress in the Field of Water‐ and/or Temperature‐Triggered Polymer Actuators

Agarwal, Seema; Jiang, Shaohua; Chen, Yiming

doi:10.1002/mame.201800548

Cited by 76 publications

(47 citation statements)

References 80 publications

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“…Side view of 2 , it is noted that numerous oxygen atoms of un‐coordinated carboxylate groups and coordinated SO 3 groups protrude out and decorate the 2D framework of 2 (Figure b). Numerous O–H ··· O and O–H ··· N non–classical hydrogen bondings [O(7)–H(7) ··· O(10) I , O(8)–H(8B) ··· O(12) ii , O(9)–H(9A) ··· N(3), O(10)–H(10A) ··· O(9), O(10)–H(10B) ··· O(3) iii , O(11)–H(11A) ··· O(5) iV , O(12)–H(12A) ··· O(6) V , O(12)–H(12B) ··· O(3), Symmetry Codes (Symmetric operation) utilized to generate equivalent atoms: i 1– x , 2 – y , – z (3_676); i i – x, y –1/2, – z + 1/2 (2_545); iii – x , – y + 2, – z + 1 (3_576); iV x , – y + 3/2, z + 1/2 (4_576); V x –1, y, z (1_455) for 2 ] also can be found in the coordination framework of 2 , which also further stabilize the 2D coordination network of 2 …”

Section: Resultsmentioning

confidence: 99%

Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Liu

Wang

et al. 2020

Zeitschrift anorg allge chemie

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Under the solvo-thermal conditions, two novel Cd II mixedligand coordination materials with 2,6-(1,2,4-triazole-4-yl)pyridine(L 1 ) and aromatic poly-carboxylic acid co-ligands such as 5-R-isophthalic acid (R = nitro, sulfo), namely [Cd() were successfully prepared. These Cd II mixed-ligand coordination polymers 1-2 have been measured by crystal X-ray analysis, FT-IR spectra and powder X-ray diffraction analyses. In 1, these seven-coordinate Cd II atoms (Cd1) are inter-linked by didentate 5-nitroisophthalic acid ligands forming 1D ARTICLE Scheme 1. Solvo-thermal assembly and characterization of two Cd II mixed-ligand coordination compounds constructed from 2,6-(1,2,4-triazole-4-yl)pyridine and aromatic poly-carboxylic acid. ]·4H 2 O (2): The synthetic part of 2 is somewhat similar to that of 1, in which 5-sulfobenzene-1,3-dicarboxylic acid (63.33 mg, 0.3 mmoL) was used to replace 5-nitroisophthalic acid in the starting material. Colorless strip-shaped single crystals of 2 were washed by CH 3 OH and H 2 O and air-dried. C 17 H 21 CdN 7 O 12 S: calcd. C, 30.94 %; H, 3.21 %; N, 14.86 %; found: C, 31.12 %; H, 3.47 %; N, 15.11 %.

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Section: Resultsmentioning

confidence: 99%

Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Liu

Wang

et al. 2020

Zeitschrift anorg allge chemie

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“…Apparently, the contraction of the fibrous matrix in the direction parallel to the fibers axis is attributed to the relaxation of the stretched electrospun polymer chains via solvent‐driven relaxation mechanism . The thermoresponsive fibers contraction and expansion in water with temperature is utilized in the literature for actuation purpose . Upon heating the water media to 40 °C (LCST) the fibrous matrix showed an additional contraction of about 50% parallel and perpendicular to the fibers axis (Figure f).…”

Section: Resultsmentioning

confidence: 99%

Controlled‐Release LCST‐Type Nonwoven Depots via Squeezing‐Out Thermal Response

Käfer

Vilensky

Vasilyev

et al. 2018

Macro Materials & Eng

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among others, [8][9][10] for the release of encapsulated drug from monolithic fibers or core-shell fibers, [11][12][13] relying in general on solute diffusion, polymeric matrix swelling, and degradation. Alternatively, electrospun fibers were designed to achieve controlled release upon specific stimuli such as pH when using polyelectrolytes, [14,15] or thermal when using thermo-responsive polymers (TPs) with a lower critical solution temperature (LCST) such as poly(N-isopropylacrylamide) (PNIPAAm) with a phase transition temperature at around 32 °C. [16] In this work, we demonstrate a temperature-controlled release of model nanoparticles from pores of potential transdermal nonwoven patch. The transdermal delivery of drugs and bioactive molecules has lot of implications not only for the local skin disease therapy but also for systemic delivery of drugs. [17] Till now, nano-sized carrier systems such as micelles, polymeric nanoparticles, or liposomes are the main skin-delivery systems to facilitate drug delivery by topical application. [18,19] Nano-carriers may facilitate transportation and/ or allow creating depots of drugs in the skin for a sustained or stimuli-induced release using external triggers based on temperature, pH, light, magnetic field, ultrasound, or electrical. [18,20] The patch in our work is made of a thermoresponsive electrospun fibrous matrix with a LCST-type phase transition temperature at 45 °C for a controlled release above the body temperature, which is not possible with PNIPAAm. Nanoparticles are encapsulated in the inter-fiber pores surrounded by a medium. When raising the ambient temperature above the LCST, the fibrous matrix shrink and as a result the encapsulated medium with the suspended particles is released to the immediate environment where the fibrous patch is applied onto the skin surface (Scheme 1).At first, we demonstrate the synthesis, characterization, and preparation of electrospun fibers of an LCST-type poly(methylacrylamide-co-N-tert-butylacrylamide-co-4-acryloylbenzophenone) P(MAAm-NtbAAm-ABP) copolymer. The copolymer was successfully electrospun to form a nano-fibrous matrix, which exhibits thermo-initiated, LCST-based shrinkage in aqueous media. Then, for the demonstration of the temperature-triggered-release, the fibrous matrix was uploaded at room temperature with nano-carriers (fluorescently labeled carboxylated latex nanoparticles, 200 nm in diameter) and in situ release while heating was monitored using real-time fluorescence microscopy. The thermo-responsive fibrous matrix demonstrated controlled nano-carriers release due to rapid and reversible swelling and shrinking, in aqueous media. Nonwoven DepotsA novel thermoresponsive fibrous matrix as controlled release depots upon heating is described. The matrix is composed of electrospun fibers of a lower critical solution temperature (LCST)-type poly(methacrylamide-co-N-tert-butylacrylamide-co-4-acryloylbenzophenone) P(MAAm-NtbAAm-ABP) copolymer. Spherical particles, simulating depots of drugs, are embedded with liquid...

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“…Just as the traditional electrospinning, one of the most important challenges for the modified coaxial electrospinning is to create nanofibers on a large scale [71][72][73]. Another important challenge is get more and more knowledge about the special working processes [74], here the key point is about the unspinnable sheath fluid's role during the transmission of solvents through air-fluid-fluid interfaces and the related solidification mechanism of electrospun nanostructures.…”

Section: Discussionmentioning

confidence: 99%

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

Wang

Yang

et al. 2020

Polymers

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Electrospinning, as a promising platform in multidisciplinary engineering over the past two decades, has overcome major challenges and has achieved remarkable breakthroughs in a wide variety of fields such as energy, environmental, and pharmaceutics. However, as a facile and cost-effective approach, its capability of creating nanofibers is still strongly limited by the numbers of treatable fluids. Most recently, more and more efforts have been spent on the treatments of liquids without electrospinnability using multifluid working processes. These unspinnable liquids, although have no electrospinnability themselves, can be converted into nanofibers when they are electrospun with an electrospinnable fluid. Among all sorts of multifluid electrospinning methods, coaxial electrospinning is the most fundamental one. In this review, the principle of modified coaxial electrospinning, in which unspinnable liquids are explored as the sheath working fluids, is introduced. Meanwhile, several typical examples are summarized, in which electrospun nanofibers aimed for the environment remediation were prepared using the modified coaxial electrospinning. Based on the exploration of unspinnable liquids, the present review opens a way for generating complex functional nanostructures from other kinds of multifluid electrospinning methods.

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Progress in the Field of Water‐ and/or Temperature‐Triggered Polymer Actuators

Cited by 76 publications

References 80 publications

Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Controlled‐Release LCST‐Type Nonwoven Depots via Squeezing‐Out Thermal Response

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

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Progress in the Field of Water‐ and/or Temperature‐Triggered Polymer Actuators

Cited by 76 publications

References 80 publications

Solvo‐thermal Preparation and Characterization of Two CdII Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Solvo‐thermal Preparation and Characterization of Two CdII Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Controlled‐Release LCST‐Type Nonwoven Depots via Squeezing‐Out Thermal Response

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

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Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

Solvo‐thermal Preparation and Characterization of Two Cd^II Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)