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Multi-Modal Locomotion of Caenorhabditis elegans by Magnetic Reconfiguration of 3D Microtopography

ADVANCED SCIENCE 2022年第36期9卷 e2203396页

作者： Park, Jeong Eun Yoon, Sunhee Jeon, Jisoo Kim, Chae Ryean Jhang, Saebohm Jeon, Tae-Joon Lee, Seung Goo Kim, Sun Min Wie, Jeong Jae Hanyang Univ Res Inst Ind Sci Seoul 04763 South Korea Inha Univ Program Environm & Polymer Engn Incheon 22212 South Korea Inha Univ Dept Biol Sci & Bioengn Incheon 22212 South Korea Univ Ulsan Dept Chem Ulsan 44610 South Korea Inha Univ Dept Mech Engn Incheon 22212 South Korea Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea

Miniaturized untethered soft robots are recently exploited to imitate multi-modal curvilinear locomotion of living creatures that perceive change of surrounding environments. Herein, the use of Caenorhabditis elegans (C. elegans) is proposed as a microscale model capable of curvilinear locomotion with mechanosensing, controlled by magnetically reconfigured 3D microtopography. Static entropic microbarriers prevent C. elegans from randomly swimming with the omega turns and provide linear translational locomotion with velocity of approximate to 0.14 BL s(-1). This velocity varies from approximate to 0.09 (for circumventing movement) to approximate to 0.46 (for climbing) BL s(-1), depending on magnetic bending and twisting actuation coupled with assembly of microbarriers. Furthermore, different types of neuronal mutants prevent C. elegans from implementing certain locomotion modes, indicating the potential for investigating the correlation between neurons and mechanosensing functions. This strategy promotes a platform for the contactless manipulation of miniaturized biobots and initiates interdisciplinary research for investigating sensory neurons and human diseases.

关键词： 3D microtopography Caenorhabditis elegans magnetic shape-reconfiguration microbarrier multi-modal locomotion

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Green co-solvent-assisted one-pot synthesis of high-performance flexible lignin polyurethane foam

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CHEMICAL ENGINEERING JOURNAL 2024年 499卷

作者： Zhang, Mairui Jeong, Soyeon Cho, Woongbi Ryu, Jiae Zhang, Baowen Crovella, Paul Ragauskas, Arthur J. Wie, Jeong Jae Yoo, Chang Geun SUNY Syracuse Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea SUNY Syracuse Coll Environm Sci & Forestry Dept Sustainable Resources Management Syracuse NY 13210 USA Univ Tennessee Knoxville Dept Chem & Biomol Engn Knoxville TN 37996 USA Joint Inst Biol Sci Biosci Div Oak Ridge Natl Lab Oak Ridge TN USA Univ Tennessee Inst Agr Ctr Renewable Carbon Dept Forestry Wildlife & Fisheries Knoxville TN USA Michael M Szwarc Polymer Res Inst Syracuse NY USA Inst Sustainable Mat & Mfg Syracuse NY 13210 USA

Although lignin is a promising candidate as a source of polyol for producing eco-friendly polyurethane foam (PUF), its direct application has limitations, primarily stemming from the brittleness of the resulting products and poor processibility at high lignin loadings. To address these technical challenges, we introduced an effective co-solvent for the lignin-based polyurethane foams (LPUFs) with up to 80 wt% of lignin substitution for petroleum polyols. As a green co-solvent that involves carbon dioxide fixation during its production, propylene carbonate (PC), was blended with lignin and improved the distribution of lignin by decreasing the viscosity, providing a room-temperature reaction. The LPUFs demonstrated a comparable thermal insulation performance (R-values greater than 5 in(-1)) with commercially available PUF with a uniform size of closed-cell structure induced by the reduced viscosity of lignin-based polyol. LPUFs also showed enhanced fire retardancy and moisture resistance compared to the control PUFs, benefiting from lignin's intrinsic fire-resistant and hydrophobic properties. To mitigate the brittleness issue at high lignin loadings, flexible polyethylene glycols (PEGs) with a high molecular weight (i.e., PEG-1000) were dissolved in PC at room temperature to further improve the mechanical strength of LPUFs. The compressive strength of LPUFs with 80 wt% lignin substitution content was remarkably improved to 226 kPa by the employment of co-solvent and PEG-1000 compared to the control PUF (<140 kPa). Moreover, the flexibility of the LPUFs was successfully controlled by simply adjusting the PEG-400/ PEG-1000 ratio. The results of this study provide valuable insights for accelerating and broadening the utilization of lignin in sustainable materials and manufacturing areas.

关键词： Lignin Co-solvent Polyurethane foam Thermal insulation Flexibility

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Functional group effect of chemically modified microcrystalline methyl cellulose on thermoplastic polyurethane composites

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CELLULOSE 2023年第11期30卷 6917-6931页

作者： Jhang, Saebohm Cho, Woongbi Lee, Seo Ku Yu, Ah Ran Lee, Jae Gyeong Jung, Kyungho Pu, Yunqiao Yoo, Chang Geun Wie, Jeong Jae Inha Univ Program Environm & Polymer Engn Incheon 22212 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA Inha Univ Dept Polymer Sci & Engn Incheon 22212 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea LG Elect Inc Mat & Devices Adv Res Inst Adv Mat Team Bldg W1LG Sci Pk10Magokjungang 10 Ro Seoul 07796 South Korea Oak Ridge Natl Lab Joint Inst Biol Sci Biosci Div Oak Ridge TN 37831 USA Michael M Szwarc Polymer Res Inst Syracuse NY 13210 USA Hanyang Univ Dept Chem Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea

Microcrystalline cellulose (MCC) is a promising bio-based filler for lightweight yet mechanically high-performance eco-polymer composites because of its low density and high biocompatibility. However, intermolecular hydrogen bonding among MCC is stronger than the polymer-filler interactions, which deteriorate the mechanical properties of the composites. Herein, we investigated the effects of functional groups on the mechanical properties of composites by scrutinizing chemically modified microcrystalline methyl cellulose (m-MMC) with three different substitution levels of hydroxyl group to hydroxypropyl (HP) group: no-, low-, and high-level substitution (HP-0, HP-low, and HP-high). The degree of HP substitution of m-MMC was quantitatively measured by CP/MAS NMR analysis. The relatively bulky HP groups interrupted the filler-filler intermolecular interactions and reduced the crystallinity and density of m-MMC, as evident from X-ray diffractometer and pycnometer data, respectively. For scalable production of the composites, the m-MMC were compounded with thermoplastic polyurethane (TPU) by a twin-screw extruder

关键词： Thermoplastic polyurethane Microcrystalline cellulose Composites Mechanical properties Structure-property relationships

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Enhancement of thermomechanical properties of sulfur-rich polymers by post-thermal treatment

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POLYMER CHEMISTRY 2023年第8期14卷 943-951页

作者： Han, Nara Cho, Woongbi Hwang, Jae Hyuk Won, Sukyoung Kim, Dong-Gyun Wie, Jeong Jae Inha Univ Program Environm & Polymer Engn 100 Inha Ro Incheon 22212 South Korea SUNY Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Korea Res Inst Chem Technol Adv Mat Div 141 Gajeong Ro Daejeon 34114 South Korea Hanyang Univ Res Inst Ind Sci 222 Wangsimni Ro Seoul 04763 South Korea Univ Sci & Technol Adv Mat & Chem Engn 217 Gajeong Ro Daejeon 34114 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimmni Ro Seoul 04763 South Korea Hanyang Univ Dept Chem Engn 222 Wangsimmni Ro Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Michael M Szwarc Polymer Res Inst Syracuse NY 13210 USA

Recently, sulfur-rich polymers have been applied in various fields including energy storage, mercury removal, and infrared (IR) optics. However, sulfur-rich polymers typically exhibit insufficient thermomechanical properties for practical applications. Herein, we systematically investigate the effects of thermal treatment on the thermomechanical properties, represented by the glass transition temperature (T-g) and storage modulus, of sulfur-rich polymers prepared by inverse vulcanization with 70 wt% elemental sulfur (S) and 30 wt% divinylbenzene (DVB). The thermal treatment was conducted at three different temperatures (110, 140, and 170 degrees C) for six different times (1, 2, 6, 12, 24, and 48 h). During the thermal treatment, the thermomechanical properties of poly(sulfur(70)-random-DVB30) [poly(S-70-r-DVB30)] increased owing to the thermal degradation of small molecules, including sulfur oligomers and thermally degraded DVB, which acts as a plasticizer. However, excessive thermal treatment induced a deterioration in thermomechanical properties owing to thermal degradation. By systematic investigation of the thermal treatment, the storage modulus of poly(S-70-r-DVB30) could increase from 3 GPa to 4 GPa.

关键词： Heat treatment

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Carbon nanotube-reduced graphene oxide fiber with high torsional strength from rheological hierarchy control

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NATURE COMMUNICATIONS 2021年第1期12卷 396-396页

作者： Eom, Wonsik Lee, Eunsong Lee, Sang Hoon Sung, Tae Hyun Clancy, Adam J. Lee, Won Jun Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Dept Elect Engn Seoul 04763 South Korea UCL Dept Chem London WC1H 0AJ England Dankook Univ Dept Fiber Syst Engn Yongin 16890 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea

High torsional strength fibers are of practical interest for applications such as artificial muscles, electric generators, and actuators. Herein, we maximize torsional strength by understanding, measuring, and overcoming rheological thresholds of nanocarbon (nanotube/graphene oxide) dopes. The formed fibers show enhanced structure across multiple length scales, modified hierarchy, and improved mechanical properties. In particular, the torsional properties were examined, with high shear strength (914MPa) attributed to nanotubes but magnified by their structure, intercalating graphene sheets. This design approach has the potential to realize the hierarchical dimensional hybrids, and may also be useful to build the effective network structure of heterogeneous materials. Fibers with high torsional strength are of practical interest for artificial muscles, electric generators, actuators, etc. Here, the authors optimize torsional strength by overcoming rheological thresholds of nanocarbon (nanotube/graphene oxide) dopes.

关键词： Condensed-matter physics Nanoscale materials Soft materials

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Defect-engineered composite with ammonium vanadate and 1T-MoS2 for superior aqueous zinc-ion battery applications

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APPLIED SURFACE SCIENCE 2023年 641卷

作者： Lee, Sanghyun Hwang, Jeonguk Park, Changyong Ahn, Suhyun Do, Kwanghyun Kim, Sungwook Lee, Kangmin Lee, Se Hun Salunkhe, Rahul R. Ahn, Heejoon Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Battery Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea Seoul Natl Univ Adv Inst Convergence Technol Suwon 16229 South Korea Indian Inst Technol Dept Phys Jammu 181221 Jammu & Kashmir India Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

Aqueous zinc-ion batteries (AZIBs) are competitive energy-storage systems owing to their high ionic conductivity, safety, low cost, and eco-friendliness. Vanadium-based oxides have gained research interest as cathode materials for AZIBs because of their high capacities derived from their multivalent states and layered structures. However, vanadium-based oxides continue to exhibit poor performance as electrodes owing to critical issues, such as structural collapse, cation trapping, and poor electrical conductivity, which limit their practical application. Defect-engineered composite cathode materials consisting of (NH4)(2)V6O16 center dot 1.5H(2)O (NVO) nanorods and metallic 1T-MoS2 nanosheets were fabricated using a sonochemical method. NH4+ and H2O were co-intercalated into the NVO interlayer and served as pillars for stabilizing the layered structure. The 1T-MoS2 nanosheets promote fast charge transfer by providing conductive networks to the NVO. Furthermore, the oxygen defects in the NVO lattice weaken the electrostatic attraction between the inserted Zn2+ cations and the lattice oxygen layers, facilitating reversible Zn2+ (de)intercalation during charging-discharging. Consequently, the Od-NVO/Oi-MoS2 electrode exhibited a high capacity of 370.5 mAh/g at a current density of 0.2 A/g. In addition, it exhibited a high capacity of 141 mAh/g and maintained 92.5% of its initial capacity after 2000 cycles at 10 A/g.

关键词： Hybrid 1D-2D composite Defect engineering Ammonium vanadate Molybdenum disulfide Aqueous Zinc-ion battery

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Dual facet passivation of silver halometallate for eco-friendly silver bismuth sulfide near IR photodetector

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CHEMICAL ENGINEERING JOURNAL 2023年第1期473卷

作者： Sharma, Ashish Kim, Hanjae Kim, Gunhee Kang, Jinhyeon Lee, Cheong Beom Bae, Sung Yong Song, Hochan Kim, Kyeounghak Kim, Jong Hyun Jung, In Hwan Kang, Dong-Won Lee, Jihoon Choi, Hyosung Hanyang Univ Res Inst Convergence Basic Sci Dept Chem 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Res Inst Nat Sci 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Chem Engn 222 Wangsimni Ro Seoul 04763 South Korea Ajou Univ Dept Mol Sci & Technol Suwon 16499 South Korea Chung Ang Univ Dept Energy Syst Engn 84 Heukseok Ro Seoul 06974 South Korea

Ternary chalcogenide silver bismuth sulfide nanocrystals (AgBiS2 NCs) have taken great strides in the past few years to emerge as one of the better eco-friendly alternatives to compete with the prevalent toxic semiconductor materials such as lead sulfide quantum dots (PbS QDs) in the near-infrared (NIR) region. Nevertheless, their implementation in photodetectors has been scarce due to high dark current and complicated solid-state ligand exchange fabrication steps involved, resulting in a lower overall detectivity. The performance is further deemed to be stunted due to the difficulty associated with the passivation of the charge-neutral (100) facet of larger AgBiS2 NCs efficiently. In this work, we aimed to develop a mixed 'halometallate' ligand approach, wherein we introduce silver bromide (AgBr) as an ancillary ligand to silver iodide (AgI), passivating both (100) and (111) facets of cubic AgBiS2 solids in a facile solution-phase ligand exchange step to obtain highly dispersible colloidal ink. Decreased bond length, bond angle (Br-Ag-Br), and ionic size of [AgBr2-] anion induces less compressive strain compared to [AgI2-], culminating in higher molecular stability on the AgBiS2 surface. This dual passivation reduces the dark current to 6.01 x 10-7 A cm-2 and a high specific detectivity of 1.8 x 1012 Jones at 800 nm is achieved, comparable to ubiquitous PbS QD devices. We also demonstrate diminished in-gap carrier density population, enhanced light detection, and ultrafast microsecond response at higher wavelengths operating under high bias (-1V) photoconductive mode. This study illustrates the role of optimum surface coverage in eliminating the deleterious non-radiative recombination defect centers by introducing additional ligands in solution processed AgBiS2 NC and the viability of the mixed ligand approach for stable eco-friendly NIR photodetectors.

关键词： Silver bismuth sulfide nanocrystal Dual facet passivation NIR photodetectors Ecofriendly

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Wavelength-selective porphyrin photodiodes via control of Soret- and Q-band absorption

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DYES AND PIGMENTS 2021年 193卷 109531-109531页

作者： Bernardini, Martina Shasa Kim, Juhee Kim, Hyeokjun Song, Minkyu Jang, Woo-Dong Chung, Dae Sung Jung, In Hwan Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Kookmin Univ Dept Chem 77 Jeongneung Ro Seoul 02707 South Korea Pohang Univ Sci & Technol POSTECH Dept Chem Engn Pohang 37363 South Korea Yonsei Univ Dept Chem 50 Yonsei Ro Seoul 03722 South Korea

Porphyrin-based photodiode materials have mainly been targeted to achieve panchromatic absorption by maximizing the Soret- and Q-band absorption;however, they have rarely been studied with the purpose to make them wavelength-selective in photodetecting devices. In this study, we synthesized a wavelength-selective porphyrin material, PZn-FL, via Sonogashira coupling between an ethyne pi-linked porphyrin core (PZn) and four fluorene (FL) moieties. The synthesized PZn-FL material showed a narrow full-width-at-half-maximum (FWHM) of 75 nm in the blue absorption region. The Q-band absorption of PZn-FL was significantly suppressed in organic photodiodes (OPDs), resulting in a blue-selective specific detectivity spectrum with a FWHM of 75 nm and a noise equivalent power of 2.86 x 10-12 W/Hz0.5. The planar backbone structure of PZn-FL was beneficial to increase charge transport and reduce bimolecular recombination, and the vertically oriented alkyl side chains of the PZn backbone contributed to prevent severe intermolecular aggregation and maintain a narrow absorption in film state.

关键词： Porphyrins Photodetectors Wavelength selectivity Photodiodes Detectivity

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Elucidating the role of etchants induced photo- and electro-activity in holey graphene oxide and graphene quantum dots composites for textile electrode applications

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SYNTHETIC METALS 2023年第1期295卷

作者： Sun, Kyung Chul Ali, Mumtaz Sahito, Iftikhar Ali Noh, Jung Woo Jeong, Sung Hoon Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea Natl Text Univ Sch Engn & Technol Dept Text Engn Faisalabad 37610 Pakistan Mehran Univ Engn & Technol Dept Text Engn Jamshoro 76062 Pakistan Korea Inst Ind Technol Adv Text R&D Dept F-15588 Ansan France Hanyang Univ Hanyang Inst Energy & Environm Seoul 04763 South Korea

Holey graphene oxide (HGO) can unlock the potential of graphene oxide (GO) by providing high surface area, increased surface reactivity, and fast electrolyte flow. Generally, HGOs are prepared by etching GO, and gra-phene quantum dots (GQDs) are formed as a byproduct during the etching. GQDs are active materials to increase charge mobility and reduce charge recombination. Previous studies employed strong and high boiling point etchants (e.g., H2SO4), and a filtration process is required for purification. GQDs remained in the filtrate and were lost during the purification because of their small size. To avoid the wastage of GQDs, we tested the low boiling point etchants, which can be separated via vacuum drying to retain GQDs. Considering easy recovery, H2O2, NH4OH, and HNO3 were used for etching, and the resulting composite of GQDs and HGO was charac-terized and tested for photocatalytic and electrocatalytic activity. The active composite materials were loaded on carbon cloth and reduced to fabricate a stable electrode for performance evaluation. Amongst all etchants, NH4OH could generate the highest surface roughness and nitrogen doping. The NH4OH etched HGO & GQDs composite demonstrated excellent photocatalytic and electrocatalytic activity due to its enhanced surface reactivity, despite its reduced surface area. Compared to negligible photocatalysis of rGO, the optimized com-posite of GQDs and HGO showed nearly complete dye degradation in 4 h.

关键词： Carbon nanomaterials Etching Graphene quantum dots Holey graphene Textile substrates

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Characterization of Etched Graphite Nanoplates and Their Nonwoven Electrode Applications

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ECS JOURNAL OF SOLID STATE SCIENCE AND techNOLOGY 2022年第6期11卷 061005-061005页

作者： Sun, Kyung Chul Ali, Mumtaz Sahito, Iftikhar Ali Noh, Jung Woo Jeong, Sung Hoon Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea Natl Text Univ Sch Engn & Technol Dept Text Engn Faisalabad 37610 Pakistan Mehran Univ Engn & Technol Dept Text Engn Jamshoro 76062 Pakistan Korea Inst Ind Technol Adv Text R&D Dept Ansan 15588 South Korea Hanyang Univ Hanyang Inst Energy & Environm Seoul 04763 South Korea

Carbon materials are under the investigative spotlight for their earth-abundance, sustainability, and intriguing electronic properties. Amongst all nano-carbon allotropes, exfoliated graphite nanoplates (xGnP) currently dominate the commercial market due to their low cost and high performance. However, smooth basal planes of xGnP possess limited surface functionality, leading to poor thin film-forming ability and poor adhesion of xGnP with flexible textile substrates. To overcome these issues, here we have proposed a facile acid etching process for localized oxidation of xGnP sheets. The etching process removes some xGnP surface, hence forming pits on xGnP sheets, along with introducing surface functional groups. The functional surface of etched-xGnP facilitates uniform coating on polyester microfiber nonwoven membrane, resulting in a flexible nonwoven structured electrode. The comparison of etched and pristine xGnP electrodes revealed better conductivity, dye adsorption, electrocatalytic activity, and heat generation ability of the etched-xGnP. The higher surface area and oxygen/nitrogen doping incurred during the etching process were observed to play a critical role in the superior performance of etched-xGnP. The facile etching process will advance the understanding and applications of flexible electrodes for wearable electronic devices.

关键词： Electrodes

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