Fiber-like Morphology Research Articles

Photoregulated Supramolecular Polymerization through Halogen Bonding.

Supramolecular polymers are able to change their structure, morphology and function in response to external stimuli. However, controlling the independence of stimuli-responses in these systems is challenging. Herein, we exploit halogen bonding (XB) as a reversible network element to regulate the photoresponsive and adaptive behavior of supramolecular polymers. To this end, we have designed a system comprising an amphiphilic XB acceptor with the ability to self-assemble in aqueous media (OPE-Py) and a molecule with a dual photoresponsive and XB donor function [(E)-Azo-I]. OPE-Py self-assembles in aqueous media into supramolecular polymers, which transform into nanoparticle assemblies upon co-assembly with (E)-Azo-I. Interestingly, a third type of assembly (2D sheets) is obtained if OPE-Py is treated with (E)-Azo-I and exposed to photoirradiation. At ambient conditions, both nanoparticles and 2D sheets remain invariant over time. However, heating dissociates the XB interactions present in both assemblies, resulting in their transformation to the original fiber-like morphology of OPE-Py. Thus, breaking the communication between self-assembly and the stimuli-responses upon heating restores the original state of the system, drawing parallels to feedback loops in programming language. This work broadens the still limited scope of XB in solution assemblies and paves the way for multifunctional adaptive supramolecular systems.

α-Mn2O3 porous fibers synthesized by air-heated solution blow spinning (A-HSBS) technique: electrochemical assessment for oxygen evolution reaction in alkaline medium

In this work, we report a novel synthesis route of α-Mn2O3 porous fibers obtained by air-heated solution blow spinning (A-HSBS) and their application as an electrocatalyst for the oxygen evolution reaction (OER). Our α-Mn2O3 porous fibers presented superior OER performance to other electrocatalysts reported in the literature, and it is because the fibrous morphology and multiple Mn charge states, which lead to a small overpotential of 378 mV @ 10 mA cm−2. Furthermore, the fibrous α-Mn2O3 electrode exhibited long-term electrochemical stability confirmed by chronopotentiometry testing for 18 h at a current density of 10 mA cm−2 and showing retention/preservation of microstructural properties. Our results underscore the potential of the A-HSBS for producing electrodes with a fiber-like morphology, based on transition metals. The proposed synthesis route can provide economical, durable, and efficient electrocatalysts for water splitting, which can be applied in several applications, such as electrocatalysts, biosensors, among others.

Pinning/depinning dynamics of trijunction lines during faceted/nonfaceted eutectic growth

We present an in situ experimental study of decoupled- and coupled-growth patterns in a binary faceted/ nonfaceted (f/nf) eutectic alloy. Real-time optical observation is carried out at low growth velocity V (<0.3μms−1) during directional solidification of the transparent AminoMethylPropaneDiol-Succinonitrile (AMPD-SCN) eutectic in thin samples. On a large scale, the two-phase growth front mostly exhibits irregularly spaced decoupled-growth patterns involving faceted fiber-like AMPD crystals that protrude in the liquid ahead of, and in weak diffusive interaction with the nonfaceted SCN solid. The morphological stability of low-velocity, steady-state decoupled-growth patterns is evidenced. In addition, three types of (f/nf) coupled-growth patterns with fiber-like, tubular (or “hollow”) and C-shaped morphologies, respectively, are identified. New light is cast on the pinning/depinning dynamics of trijunctions at which the two solid phases and the liquid meet in equilibrium. A discussion is initiated on the interplay between the interfacial kinetics of the more or less mobile facets and the solute diffusion field, and on the stability of triple junctions with strongly anisotropic interfaces.

Improvement of fiber-like chewiness of dried pork: Fish cubes and mince with added enzymes

Consumers like dried meat slice, but the desired fiber-like chewiness may be affected by the addition of fish source. Therefore, this study was aimed to investigate the effect of component mixture (pork and fish); particle size (fish mince or cube) and enzyme (transglutaminase and laccase) on dried slice texture. Furthermore, the reason was shown by water distribution, protein secondary structure, and microstructure. Results showed that hardness, chewiness, and tensile strength were the highest at the rate of pork and fish mince by 6:4; at the rate of fish cube and mince by 5:5; and at the addition of transglutaminase (TG) by 0.8%. To explore its reason, it showed the largest water peak area with 3983.8 ± 45.9, 4817.8 ± 209.3 and 3642.5 ± 18.1, the largest decrease of α-helix by 31.1%, 1.8%, 22.6%, and the most compact fiber-like morphology in the above three groups. This study indicated that a slight cross-linking between pork and fish proteins by TG was benefit for fiber-like chewiness, while over-cross-linking was detrimental with more elastic structure formed. In conclusion, percentage of pork to fish, fish cube to mince, and the addition amount of TG all contributed to the final fiber-like chewiness of dried slice significantly.

A comparative study on morphology dependent performance of neodymium – graphene as an anode material in lithium-ion batteries

The use of rare earth (RE) materials in various applications is gaining significant attention due to their unique electronic configurations. Neodymium (Nd), with its electronic configuration of 4f4 6s2, is one such RE material of interest. However, fabricating low-dimensional forms of RE materials presents a challenge. Additionally, achieving the synthesis of nanoscale RE morphologies on graphene surfaces adds another level of difficulty to the process. In this work, the fabrication of various nanoscale morphologies of neodymium (Nd) on graphene‑nickel foam (Gr-Ni) substrates is demonstrated. This is achieved using a double-heating zone chemical vapor deposition technique, where each heating zone reaches temperatures as high as 1500°C. The resulting Nd-Gr-Ni samples are grown under similar conditions and serve as free-standing additive free anode for direct application in lithium-ion batteries. Among the different nanoscale morphologies obtained, the fiber-like morphology shows the most promising performance. Compared to the ball-like and pyramided-like morphologies, the fiber-like morphology exhibits enhanced cyclic performance with 99% Columbic efficiency and high-capacity retention. Furthermore, the fiber-like anode material demonstrates stable rate performance within a current density range of approximately 0.1–0.5 mAcm−2. The mechanical stability of the Nd-Gr-Ni composites makes them suitable to produce practical LIBs.

Extraction of Cellulose Nanocrystals and Nanofibers from Rubber Leaves and Their Impacts on Natural Rubber Properties

This study aimed to chemically isolate two distinct types of nanocellulose derived from rubber leaves and investigate their use in natural rubber (NR). The cellulose nanocrystals (CNCs) were obtained through acid hydrolysis, while oxidation with 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO) was used to produce cellulose nanofibers (CNFs). The CNCs exhibited rigid and rod-like structures due to the removal of amorphous regions through acid hydrolysis, whereas the CNFs retained flexible, fiber-like morphologies and high aspect ratios. Incorporating CNCs or CNFs into NR improved its tensile properties, with the rigid CNCs enhancing the mechanical properties more than the flexible CNFs. CNC addition resulted in a 40% increase in tensile strength and a 38% increase in Young's modulus of NR. However, elongation at break decreased with filler content. On the other hand, CNF addition improved the elongation at the break without compromising the tensile properties. NR with CNF addition exhibited a 25% increase in tensile strength, a 30% increase in Young's modulus, and a 20% increase in elongation at break. Additionally, the biodegradability of NR nanocomposite films containing CNCs or CNFs surpassed that of unfilled NR film. Notably, a 6-month soil burial test revealed weight losses of 35% and 40% for NR nanocomposite films with CNCs and CNFs respectively, compared to a weight loss of 25% for the unfilled NR film.

Unraveling the role of solvent type in the physical and chemiresistive gas sensing properties of nebulizer-sprayed CuO films

Copper oxide thin films were grown via a nebulizer spray pyrolysis technique using five different solvents. The XRD patterns revealed that the CuO films prepared with alcoholic solvents are more crystalline andRaman analysis confirmed the crystalline quality of the films. The sample was prepared with an ethanolic solvent, producing a hierarchical, fiber-like morphology. EDAX spectra confirmed the presence of copper and oxygen in CuO films. XPS analysis showed a significant reduction of oxygen species in ethanol compared to water as a solvent. The film deposited with an ethanolic solution showed the lowest bandgap of 1.7 eV. PL spectra showed strong emission at 628 nm. Lifetime studies suggest that the enhancement in the decay lifetime of CuO films can be advantageous for optoelectronic applications. CuO thin films deposited with alcoholic solvents exhibited lower resistance values. VOC detection was employed by the CuO-based gas sensors. i.e., acetone, ethanol, and toluene.

Structural Study of Diketopyrrolopyrrole Derivative Thin Films: Influence of Deposition Method, Substrate Surface, and Aging.

We report the morphology and microstructure of n-dialkyl side-chain-substituted thiophene DPP end-capped with phenyl groups (Ph-TDPP-Ph) thin films and compare the influence of deposition method and substrate surface using thermally oxidized Si and graphene substrates as well as monolayer graphene surfaces with an underlying self-assembled octadecyltrichlorosilane monolayer, complemented by an aging study of spin-coated films over a 2 weeks aging period. A distinct difference in morphology was observed between spin-coated and vacuum-deposited thin films, which formed a fiber-like morphology and a continuous layer of terraced grains, respectively. After an initial film evolution, all combinations of deposition method and substrate type result in well-ordered thin films with almost identical crystalline phases with slight variations in crystallinity and mosaicity. These findings point toward strong intermolecular forces dominating during growth, and the templating effect observed for other oligomer films formed on graphene is consequently ineffective for this material type. Upon aging of spin-coated films, a noticeable evolution involving two different morphologies and crystalline phases were observed. After several days, the thin film evolved into a more stable crystal phase and a fiber-like morphology. Moreover, slight variation in optical spectra were elucidated on the basis on density functional theory calculations. These results demonstrate that thin-film properties of DPP derivatives can be tailored by manipulating the film formation process.

Amino Acid- and Dipeptide Amphiphile-Based Supramolecular Eutectogels: Soft Materials for Drug Entrapment–Release and Wastewater Treatment

Supramolecular gels prepared in solvents of extreme polarities have received widespread importance across scientific disciplines. In this regard, soft materials based on deep eutectic solvents (DESs) have been receiving notable attention owing to their low toxicity, low volatility, and ability to solubilize hydrophobic drugs and natural products. A DES is a mixture of two or more compounds having a melting point lower than that of the individual components. Reports on supramolecular eutectogels derived from small molecules are very few and serendipitous. Therefore, designing a low-molecular-weight eutectogelator (LMWEG) remains challenging and demands comprehensive structure–property correlation. To this end, we have developed amino acid- and dipeptide amphiphile-based LMWEGs that immobilized choline chloride/phenylacetic acid-based DES with a minimum gelation concentration (MGC) of 0.5–10.0%, w/v. Variation of amino acids, protecting groups at the N-terminal, and hydrophobic chain length of the gelator delineated the crucial influence of the hydropathy index of amino acids and thereby the hydrophilic–lipophilic balance in eutectogelation. Replacement of the aromatic moiety in the gelator and/or in the DES with an aliphatic one ascertained the optimal necessity of aromaticity for efficient eutectogelation. Eutectogels were thermoreversible and showed considerable thermal stability (Tgel ∼ 50–70 °C). Spectroscopic and microscopic studies confirmed the fiber-like morphology of the eutectogels and the participation of hydrogen bonding in eutectogelation. Newly derived eutectogels exhibited considerably good mechanical strength (γc ∼ 7.5–16.5%) and interesting injectable as well as thixotropic properties. The ability to adsorb cationic and anionic dyes by the eutectogels ensured their potential in wastewater treatment. Importantly, these supramolecular eutectogels can be used in drug delivery owing to their ability to entrap the hydrophobic drug curcumin and subsequently its pH-dependent sustained release.

Electrospinning and Cell Fibers in Biomedical Applications.

Human body tissues such as muscle, blood vessels, tendon/ligaments, and nerves have fiber-like fascicle morphologies, where ordered organization of cells and extracellular matrix (ECM) within the bundles in specific 3D manners orchestrates cells and ECM to provide tissue functions. Through engineering cell fibers (which are fibers containing living cells) as living building blocks with the help of emerging "bottom-up" biomanufacturing technologies, it is now possible to reconstitute/recreate the fiber-like fascicle morphologies and their spatiotemporally specific cell-cell/cell-ECM interactions in vitro, thereby enabling the modeling, therapy, or repair of these fibrous tissues. In this article, a concise review is provided of the "bottom-up" biomanufacturing technologies and materials usable for fabricating cell fibers, with an emphasis on electrospinning that can effectively and efficiently produce thin cell fibers and with properly designed processes, 3D cell-laden structures that mimic those of native fibrous tissues. The importance and applications of cell fibers as models, therapeutic platforms, or analogs/replacements for tissues for areas such as drug testing, cell therapy, and tissue engineering are highlighted. Challenges, in terms of biomimicry of high-order hierarchical structures and complex dynamic cellular microenvironments of native tissues, as well as opportunities for cell fibers in a myriad of biomedical applications, are discussed.

Hydrothermal Synthesis and Photocatalytic Properties of Cobalt-Doped Tungsten Oxide

Hexagonal tungsten trioxide–base interstitial solid solutions of general formula CoxWO3, where 0.01 ≤ x ≤ 0.09, were prepared hydrothermally. The dopant homogeneity extent was found to depend on рН in the working solution. Interstitial solid solutions with the highest Co2+ concentrations were formed at рН of 2.3. The CoxWO3 samples with a fiber-like morphology with a fiber diameter of ca. 40 nm, which were prepared at рН of 2.3, had the highest specific surface area, equal to 38.6 m2/g. The key parameter for the stability of the CoxWO3 crystal structure appeared to be ammonium ions residing in the hexagonal channels of the crystal structure. When tested as photocatalysts of 1,2,4-trichlorobenzene oxidation under the UV light, the prepared samples showed high chloroarene conversions and low selectivities to yield a wide range of organic compounds, including chlorine-free ones.

Chemical synthesis of magnesium oxide (MgO) from brine towards minimal energy consumption

The precipitation of magnesium from marine-derived feedstocks (e.g. waste brine discharged from desalination plants), has several environmental and economic advantages, if the right conditions are provided. In this work, the synthesis of reactive magnesium oxide (MgO) from the feedstock of simulated waste brine was demonstrated. One of the main challenges is the high energy consumption during the calcination of brucite, requiring the optimization of the calcination process to reduce this energy demand. To investigate this aspect, different calcination temperatures (400–550 °C) and durations (1−2 h) were examined and the synthesized MgO was evaluated for its chemical composition, specific surface area (SSA), reactivity and microstructure. The obtained results revealed the critical calcination condition that distinguished between low and high reactivity MgO, which also differentiated between plate-like and fiber-like morphology of MgO. Optimization of the calcination conditions led to SSA values as high as 167 m2/g. Calcination conditions with a minimum energy demand were identified for achieving MgO powders with a high reactivity, high SSA, and morphologies with a high propensity for hydration and/or carbonation reactions.

Spherical particles design of vanillin via crystallization method: Preparation, characterization and mechanism

Vanillin is a natural flavor and is widely used in the fields of medicine, food and optoelectronics. However, the stable form I of vanillin usually shows needle or fiber-like morphology during crystallization, and it has poor powder performance (flowability, bulk density, dissolution rate, etc.), which further limits its applications. In this work, to improve the powder performances of vanillin, the spherical crystals were designed and prepared via spherical agglomeration method, and the spherical particles were systematically characterized using polarized light microscopy (PLM), particle size instrumentation, powder X-ray diffraction (PXRD) and Fourier infrared transform spectroscopy (FTIR). Meanwhile, the effects of BSR (Vbridging liquid:Vsolute), agitation rate and surfactant on the morphology and particle size distribution of spherical particles were analyzed to determine the optimal operating conditions for the spherical crystallization of vanillin as well as its formation mechanism and to improve the powder performance of the products. In addition, the multicomponent spherical particles of vanillin-salicylic acid obtained by crystal co-agglomeration (CCA) meet the formulation requirements in terms of morphology and particle size, which also enhance the dissolution rate of vanillin.

Preparation and characterization of fibrous MnZn ferrite via a water-assisted solvothermal method

MnZn ferrite fibers have received wide attentions due to their unique structures, properties and potential applications. However, there are relatively few synthetic routes for fabricating MnZn ferrite fibers, the morphology and particle size of fibers are not uniform by the existing methods. In this paper, MnZn ferrite fibers have been controllably synthesized by a water-assisted solvothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analyzer (TGA) and vibrating sample magnetometer (VSM) analyses. The effects of experimental parameters such as ratio of ethylene glycol (EG) and water, reaction time and temperature, and annealed temperature on crystalline structure, size and morphology of MnZn ferrite were discussed systematically. The results indicated that the optimum experimental conditions for the formation of fibrous MnZn ferrite with uniform fiber-like morphology, smooth surface and the largest aspect ratio (length to diameter ratio) were as follows: the volume ratio of EG/water was around 3:1, the reaction time and temperature were respectively around 24 h and 120 ℃, and the annealed temperature was 500 ℃ or so. Meanwhile, the related magnetic property was also investigated. The results demonstrated that MnZn ferrite fibers had ferromagnetic nature, the saturation and remanent magnetization and coercivity of them were respectively 6.5 emu/g, 0.23 emu/g and 161.5 Oe.

Development of Cellulose-Reinforced Polyurethane Coatings: A Novel Eco-Friendly Approach for Wind Turbine Blade Protection

Wind energy is considered a clean energy source and is predicted to be one of the primary sources of electricity. However, leading-edge erosion of wind turbine blades due to impacts from rain drops, solid particles, hailstones, bird fouling, ice, etc., is a major concern for the wind energy sector that reduces annual energy production. Therefore, leading-edge protection of turbine blades has been an important topic of research and development in the last 20 years. Further, there are critical issues related to the amount of waste produced, including glass fiber, carbon fiber, and various harmful volatile organic compounds in turbine fabrication and their end-of-life phases. Hence, it is vital to use eco-friendly, solvent-free materials and to extend blade life to make wind energy a perfect clean energy source. In this study, cellulose microparticles (CMP) and cellulose microfibers (CMF) have been used as fillers to reinforce water-based polyurethane (PU) coatings developed on glass fiber reinforced polymer (GFRP) substrates by a simple spray method for the first time. Field emission scanning electron microscopy images show the agglomerated particles of CMP and fiber-like morphology of CMF. Fourier transform infrared spectra of CMP, CMF, and related coatings exhibit associated C–H, C=O, and N–H absorption bands of cellulose and polyurethane. Thermal gravimetric analysis shows that CMP is stable up to 285 °C, whereas CMF degradation is observed at 243 °C. X-ray photoelectron spectroscopy of C 1s and O 1s core levels of CMP, CMF and related coatings show C–C/C–H, C–O, C–OH, and O–C=O bonds associated with cellulose structure. The solid particle erosion resistance properties of the coatings have been evaluated with different concentrations of CMP and CMF at impact angles of 30° and 90°, and all of the coatings are observed to outperform the PU and bare GFRP substrates. Three-dimensional (3D) profiles of erosion scans confirm the shape of erosion scars, and 2D profiles have been used to calculate volume loss due to erosion. CMP-reinforced PU coating with 5 wt.% filler concentration and CMF-reinforced PU coating with 2 wt.% concentration are found to be the best-performing coatings against solid particle erosion. Nanoindentation studies have been performed to establish a relation between H3/E2 and the average erosion rate of the coatings.

Direct extraction of chitosan from snail shells by natural deep eutectic solvent

The processes involved to extract chitosan biopolymers from natural resources often employ hazardous chemicals and long processing time. This work provides a sustainable direct extraction method of chitosan from snail shells. Previous attempts using acetogenin in graviola extracts succeeded in the extraction of chitosan from marine shells. However, the slow reaction has prompted the addition of hydrogen bond acceptor solution into the graviola extract. Choline chloride is an excellent hydrogen bond acceptor mixed with acetogenin as hydrogen bond donor to form natural deep eutectic solvent (NADES) for the direct extraction of chitosan. Chitosan obtained from this method has a degree of deacetylation of 91% and a molecular weight of 481 kDa with fiber-like morphology. The direct extraction of chitosan from NADES consisting of choline chloride and acetogenin has proven to extract chitosan with comparable properties to commercial chitosan.

Atomistic mechanisms underlying plastic flow at ultralow yield stress in ductile carbon aerogels.

We investigated carbon aerogel samples with super low densities of 0.013 g cm-3 (graphite is 2.5) and conducted compression experiments showing a very low yield stress of 5-8 kPa. To understand the atomistic mechanisms operating in these super low density aerogels, we present a computational study of the mechanical response of very low-density amorphous carbonaceous materials. We start from our previously derived atomistic models (based on the DynReaxMas method) with a density of 0.16 g cm-3 representing the core regions of carbon aerogels. We considered three different phases exhibiting either a fiber-like clump morphology interconnected with string-like units or a more reticulated framework. We subjected these phases to compression and shear deformations and analyzed the resulting plastic response via an inherent-structure protocol. Strikingly, we find that these materials possess shear plastic relaxation modes with extremely low values of yield stress, negligible with respect to the finite values predicted outside this "zero-stress" region. This is followed by a succession of two additional regimes with increasing yield stress values. Our analysis of the atomistic relaxation mechanisms finds that these modes have a collective and cooperative character, taking the form of nanoscopic shear bands within the clumps. These findings rationalize our experimental observations of very low-stress plastic deformation modes in carbon aerogels, providing the first steps for developing a predictive multi-scale modeling of the mechanical properties of aerogel materials.

S-doped porous carbon fibers with superior electrode behaviors in lithium ion batteries and fuel cells

The orientation construction of S-doped porous carbon fibers (SPCFs) is realized by the facile template-directed methodology using asphalt powder as carbon source. The unique fiber-like morphology without destruction can be well duplicated from the template by the developed methodology. MgSO 4 fibers serve as both templates and S dopant, realizing the in-situ S doping into carbon frameworks. The effects of different reaction temperatures on the yield and S doping level of SPCFs are investigated. The S doping can not only significantly enhance the electrical conductivity, but also introduce more defects or disorders. As anode material for lithium ion batteries (LIBs), SPCFs electrode delivers better rate capability than undoped PCFs. And the capacity of SPCFs electrode retains around 90% after 300 cycles at 2 A g −1 , exhibiting good cycling stability. As the electrocatalysts for fuel cells, the onset potentials of SPCFs obtained at 800 and 900 °C are concentrated at 0.863 V, and the higher kinetic current densities at 0.4 V of them are larger than that of PCFs, demonstrating the superior electrocatalytic performance. Due to the synergistic effect of abundant pore channels and S doping, SPCFs electrode exhibits superior electrochemical performances as anode for LIBs and elecctrocatalyst for fuel cells, respectively. Additionally, the oriented conversion of asphalt powder into high-performance electrode material in this work provides a new way for the high value application of asphalt.

Creating 3 dimensional foam morphology of lead dioxide on the polyaniline film for improving the performance of lead flow batteries

In the present study, we investigate the effect of polyaniline as a conductive surface modifier on the morphology of the lead dioxide, PbO2, as a positive active material of lead-acid redox flow batteries. We used cyclic voltammetry to electrodeposit PbO2 on the surface of the bare and polyaniline-modified graphite substrates. We characterized the morphology and crystal structure of the electrodeposited PbO2 film using X-ray diffraction and scanning electron microscopy. In addition, we used electrochemical polarization and electrochemical impedance spectroscopy techniques to investigate the kinetics of the lead dioxide charge transfer in the presence and absence of polyaniline. To analyze the effect of the polymer film on the battery performance, we discharged the cells at different rates, and studied the cycle life of the cells. The results show that lead dioxide adopts an interconnected 3D fiber-like morphology on the surface of the polyaniline-modified graphite, resulting in a higher surface area, a better cycle life, and a higher coulombic efficiency, along with a retarded short-circuit problem. Besides, polyaniline modification increased the electron transfer rate of lead dioxide, reduced the internal resistance, enhanced the discharge plateau with less oscillation in the voltage range from 1.4 to 1.6 V, and increased the average specific power up to 367 mWg−1, resulted in a generally boosted battery performance.

Liquid-crystalline ordering of davydov-split aggregates of cyanine dyes

3,3′-ditetradecyloxacarbocyanine (DiOC14(3)) and 3,3′-Dioctadecyloxacarbocyanine (DiOC18(3)) are lipophilic carbocyanine dyes with a conjugated polymethine backbone and two long hydrocarbon tails. In this paper, we report the formation of Davydov-split aggregates of DiOC14(3) and DiOC18(3) in methanol/water mixtures with and without ammonia, which show a blue-shifted H-band and a red-shifted J-band with respect to the monomer band in their UV–vis absorption spectra. The Davydov-split aggregates of DiOC14(3) show a fiber-like morphology in the absence of ammonia and a vesicle-like morphology in the presence of ammonia. While the Davydov-split aggregates of DiOC18(3) show a vesicle-like morphology with the different lamellarities, depending on the presence of ammonia in the methanol/water mixtures. These Davydov-split aggregates with different morphologies are birefringence when being viewed through crossed polarizers, suggesting that they have liquid-crystalline phases. The Davydov-split aggregate fibers and vesicles with liquid-crystalline phases and unique excitations are great potential for photonic applications because the liquid-crystalline order and molecular exciton are synergized.