Mixture Of Dimethylformamide Research Articles

Facile preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities: Effects of mixed solvents on pore structure and supercapacitive performance

In this study, polybenzoxazine (PBZ)-based carbon microspheres were prepared via a facile method using a mixture of formaldehyde (F) and dimethylformamide (DMF) as the solvent. The PBZ microspheres were successfully obtained at the F/DMF weight ratios of 0.4 and 0.6. These microspheres exhibited high nitrogen contents after carbonization. The microstructures of all the samples showed an amorphous phase and a partial graphitic phase. The porous carbon with the F/DMF ratio of 0.4 showed significantly higher specific capacitance (275.1 F·g−1) than the reference carbon (198.9 F·g−1) at 0.05 A·g−1. This can be attributed to the synergistic electrical double-layer capacitor and pseudo-capacitor behaviors of the porous carbon with the F/DMF ratio of 0.4. The presence of nitrogen/oxygen functionalities induced pseudo-capacitance in the microspheres, and hence increased their total specific capacitance. After activation with CO2, the specific surface area of the carbon microspheres with the F/DMF ratio of 0.4 increased from 349 to 859 m2·g−1 and the specific capacitance increased to 424.7 F·g−1. This value is approximately two times higher than that of the reference carbon. The results indicated that the F/DMF ratio of 0.4 was suitable for preparing carbon microspheres with good supercapacitive performance. The nitrogen/oxygen functionalities and high specific surface area of the microspheres were responsible for their high capacitance.

Electrospinning of polystyrene polybutadiene copolymer for oil spill removal

Cleanup of spilled oil is a difficult process, and it depends on various factors, including the viscosity and the type of the oil spilled, the temperature and the type of water. Oil sorbent nanofibers were prepared from polystyrene polybutadiene copolymer (PSBR) by the electrospinning process using dimethylformamide (DMF), tetrahydrofuran (THF) or mixture of THF and DMF. The fibers surface morphology, crystallinity, hydrophobicity and the sorption capacity, reusability over potable water and seawater were studied. The electrospinning of PSBR in THF produced a structure having a combination of fibers, beads and cup-shaped structures, while the electrospun nanofibers from DMF have more uniform shape and structure. It was found that the average PSBR fibers diameters formed from 10 wt% in THF, DMF and mixture of THF and DMF with the ratio of 50:50 are 80, 1200 and 900 nm, respectively. The results revealed that the contact angle of PSBR fibrous sorbent increased by increasing the concentration of electrospun polymer solution and reached 153 degrees. Moreover, the sorption capacity for crude oil, gas oil and motor oil was 50, 62 and 125 g/g, respectively. The sorption capacity of PSBR nanofibers is higher than regular polystyrene (PS) nanofibers making it a highly promising material for oily water purification.

Electrospinning of linezolid loaded PLGA nanofibers: effect of solvents on its spinnability, drug delivery, mechanical properties, and antibacterial activities

Objective: The choice of a desirable solvent/solvent system is fundamental for optimization of electrospinning by altering the rheological and electrostatic properties of the polymer solutions.Methods: The effects of the solvents and their properties on the viscosity and spinnability of the polymer solutions and the diameter, morphology, in vitro drug release, drug release mechanisms, antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA) and mechanical properties of electrospun poly-(d,l-lactide-co-glycolide) (PLGA) nanofibers were investigated. Dichloromethane (DCM), dimethylformamide (DMF), various ratios of DCM:DMF, and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) were used as solvents.Results: Although solutions containing DCM/DMF alone were not spinnable, different ratios of DCM:DMF and HFIP were determined as suitable solvents to produce nanofibers because of high enough conductivity, viscosity, and low enough surface tension of the solutions. The DCM:DMF ratio was highly effective on viscosity, nanofiber diameter, morphology, and linezolid release rate. The viscosity of HFIP containing solution was higher and the obtained nanofibers were thicker and smoother with better mechanical properties. The release of nanofibers containing HFIP at a concentration of 10% w/v PLGA was more prolonged than nanofibers containing DCM:DMF mixture. The effect of linezolid content on nanofibers was also investigated. As the amount of linezolid increased, nanofiber diameter and drug release increased and bead formation was observed. While antibacterial activity with nanofibers for which DCM:DMF was used, lasted for 13 days, it was extended to 16 days in nanofibers for which HFIP was used.Conclusions: Type and ratio of the solvent system affected viscosity and spinnability of the solutions, the average nanofiber diameter, morphology, in vitro activity and mechanical properties of the obtained electrospun nanofibers.

Colorimetric Detection of Multiple Metal Ions Using Schiff Base 1-(2-Thiophenylimino)-4-(N-dimethyl)benzene

In this paper, a Schiff base ligand 1-(2-thiophenylimino)-4-(N-dimethyl)benzene (SL1) bearing azomethine (>C=N-) and thiol (-SH) moieties capable of coordinating to metals and forming colored metal complexes was synthesized and examined as a colorimetric chemosensor. The sensing ability toward the metal ions of Cu2+, Cr3+, Fe2+ Ni2+, Co2+, Mg2+, Zn2+, Fe2+, Fe3+, NH4VO3 (V5+), Mn2+, Hg2+, Pb2+, and Al3+ was investigated in a mixture of H2O and dimethylformamide (DMF) solvent using the UV–Visible spectra monitoring method. The synthesized Schiff base ligand showed colorimetric properties with Cr3+, Fe2+, Fe3+, and Hg2+ ions, resulting in a different color change for each metal that could be identified easily with the naked eye. The UV–Vis spectra indicated a significant red shift (~69–288 nm) from the origin after the addition of the ligand to these metal ions, which may be due to ligand-to-metal charge-transfer (LMCT). On applying Job’s plot, it was indicated that the ligand binds to the metal ions in a 2:1 ligand-to-metal molar ratio. SL1 behaves as a bidentate ligand and binds through the N atom of the imine group and the S atom of the thiol group. The results indicate that the SL1 ligand is an appropriate coordination entity and can be developed for use as a chemosensor for the detection of Cr3+, Fe2+, Fe3+, and Hg2+ ions.

Sonochemical self-growth of functionalized titanium carbide nanorods on Ti3C2 nanosheets for high capacity anode for lithium-ion batteries

Two-dimensional (2D) transition metal carbides (MXenes) have been considered a promising electrode material in energy storage devices due to their outstanding electrical conductivity, excellent electrochemical performance and unique surface terminations. Herein, with inspiration from the interesting functional structure of layered MXene, we report an efficient and facile sonochemical method to synthesize an anode material; functionally activated titanium carbide nanorods grown on Ti3C2 MXene nanosheets (FTCN-MXene) in deionized water and dimethylformamide mixture. In a striking contrast to pristine Ti3C2Tx MXene, FTCN-MXene exhibits outstanding specific anode capacity of 1,034 mAh/g, high coulombic efficiency (98.78%) after 250 cycles, and excellent reversible cyclic stability (retention of 96.05%). Functionalized nanorods grown on metallic conducting Ti3C2 sheets create more active sites and surface area, improving Li ion insertion/extraction capability. This study opens new avenues for developing functionalized MXene-based electrode materials with enhanced performance for electrochemical energy storage devices and systems.

Synthesis and Acid–Base Properties of β-Octabromo-Substituted Unsymmetrical Nitrophenylporphyrins

The bromination of [5-(4-nitrophenyl)-10,15,20-triphenylporphyrinato]cobalt(II) and [5,10,15-tris-(4-nitrophenyl)-20-phenylporphyrinato]cobalt(II) with N-bromosuccinimide in a mixture of chloroform and dimethylformamide gave [2,3,7,8,12,13,17,18-octabromo-5-(4-nitrophenyl)-10,15,20-triphenylporphyrinato]-cobalt(II) and [2,3,7,8,12,13,17,18-octabromo-5,10,15-tris(4-nitrophenyl)-20-phenylporphyrinato]cobalt(II). Treatment of the cobalt complexes with a mixture of perchloric and sulfuric acids afforded the corresponding metal-free porphyrins. Electron absorption, 1H NMR, and mass spectra of the synthesized compounds were studied, and acidity and basicity constants of the porphyrin ligands in acetonitrile were determined.

Preferential Solvation of 4-Carboxyl-2,6-Dinitrophenylazohydroxynaphthalenes in Aqueous Dimethylformamide and Dimethylsulfoxide Binary Mixtures by UV-VIS Spectroscopy

The objective of this study was to evaluate the influence of partly aqueous solvent mixtures on the solubility and azohydrazone equilibrium processes for a group of phenylazohydroxynaphthalenes, AZ-01, AZ-02, AZ-03, and AZ-04, whose applications as potential color additives and chemosensors have been demonstrated in previous studies. The UV-visible spectrum was acquired between 190–900 nm at concentrations of the dyes that precluded molecular aggregation for each dye in aqueous dimethylformamide and dimethylsulfoxide binary mixtures of varying compositions. The plots of E12 against mole fractions of the co-solvent showed deviation from ideality in the behaviors of the four dyes in the aqueous solvent mixtures. The solvation data were largely influenced by the structural chemistry of the dyes. In particular, AZ-01, which contains a free parahydroxyl group that can donate hydrogen to hydrogen bond acceptor solvents showed substantial bathochromic shifts in the aqueous DMF and DMSO mixtures as well as a local accumulation of the organic solvent in its solvation sphere. Conversely, the positional isomer AZ-02 with its ortho hydroxyl group being involved in intramolecular hydrazone rearrangement exhibited dielectric enrichment in both aqueous solvent mixtures. In addition, synergism through formation of the water–DMSO and water–DMF complexes was observed with all the dyes in the solvent mixtures with AZ-01 being solvated by the more polar component of the complex while AZ-02 and AZ-04 were solvated by the less polar solvent mixture component. Thus, the preferential solvation of the phenylazohydroxynaphthalene series from AZ-01 to AZ-04 in the partly aqueous DMSO and DMF solvent mixtures has been successfully studied using UV-visible spectroscopy.

Boron nitride nanotubes reinforced polycarbonate nanocomposites

Surface functionalized boron nitride nanotubes (f-BNNTs) with hydroxyl (OH) and amino (NH2) groups are employed as a nanofiller to reinforce polycarbonate (PC), a resin that has widely been used where a combination of transparency and high energy absorption is required, such as in armor, automotive and display technologies. To improve the interfacial compatibility of BNNTs with the PC matrix, BNNTs are treated with bromine in water inducing BN bond cleavage and subsequent formation of OH and NH2 functional groups on BNNT-surfaces. Samples of 1, 2 and 4 wt% f-BNNT/PC nanocomposite are prepared in a mixture of chloroform and dimethylformamide (DMF). The resulting f-BNNT/PC nanocomposites are processed in two ways: thin film formation from the powder by using a hot-press and plaque formation through melt-mixing-extrusion and compression molding techniques, respectively. The thermal and mechanical properties of the f-BNNT/PC nanocomposites are evaluated and compared with those of neat PC. They exhibit about 4∼8 °C improvement in thermal stability and over 30 °C higher in anti-oxidation than those of the neat PC. The testing result reveals that the f-BNNT/PC nanocomposite at 1 wt% loading achieves 39% increase in tensile toughness relative to the neat PC. Young’s modulus has an improvement by 13% (1 wt%) and 31% (4 wt%), respectively, from the thin-film samples; while about 2% and 13% improvements are observed from the extruded coupons at the same f-BNNT loadings. The transparency of the thin films is shown to decrease with the increase of f-BNNT loading.

Solubility Study of (2E)-1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one in Different Pure Solvents and Binary Solvent Mixtures from 278.15 to 328.15 K

In this study, the solubility of (2E)-1-(3-pyridyl)-3-(dimethylamino)-2-propen-1-one in methanol, n-propanol, acetone, dimethylformamide, 1,4-dioxane, ethyl acetate, tetrahydrofuran, cyclohexane, and binary solvent mixtures of (dimethylformamide + acetone), (1,4-dioxane + cyclohexane), and (dimethylformamide + ethyl acetate) at temperatures from 278.15 to 328.15 K and under a pressure of 0.1 MPa was measured by a gravimetric analysis method. The experiment results and data showed that the increased solubility in selected pure and binary solvents is the result of increasing temperature. The solubility data of (2E)-1-(3-pyridyl)-3-(dimethylamino)-2-propen-1-one were fitted well with the modified Apelblat equation, the Buchowski–Ksiazaczak λh model, the combined nearly ideal binary solvent/Redlich–Kister model, and the Jouyban–Acree model.

Curcumin release from blended polycaprolactone/polylactic acid electrospun nanofibrous meshes

There is a great interest in developing drug delivery systems that are biocompatible and release the drug in a controlled way. In this study, the release of curcumin from electrospun meshes made from polycaprolactone, polylactic acid, or their blends was studied and compared. The polymers and curcumin were dissolved in a mixture of chloroform and dimethylformamide. The beadless electrospun meshes were obtained under the following conditions: the applied voltage of 22 kV, the tip to collector distance of 13 cm, and the polymer feed rate of 0.2 ml/h. The viscosity of the polymer solution increased by increasing the percentage of polylactic acid in the mixture. As a result, the average fiber diameter of the meshes was increased. The fabricated polycaprolactone mesh showed the minimum average fiber diameter (∼120 nm) and the maximum porosity (∼71%). The hybrid nanofibrous meshes were also fabricated using two counter nozzles on both sides of the collector. The tensile strengths of the polylactic acid and polycaprolactone electrospun meshes loaded with curcumin were 19.86 and 12.64 MPa, respectively. The tensile strain of the meshes increased from 43 to 116% by increasing the polycaprolactone weight percentage in the mixture. The results showed that the physical–mechanical properties of the fabricated electrospun meshes could be tuned by polymer blending. The release of curcumin from these electrospun meshes was monitored in a buffer solution using an UV-Vis spectrophotometer. The critical parameters on the release of curcumin were found to be the type of polymers, the average diameter of nanofibers, porosity, and hydrophilicity of the meshes.

Improving Charge Transport via Intermediate‐Controlled Crystal Growth in 2D Perovskite Solar Cells

AbstractReduced‐dimensional hybrid perovskite semiconductors have recently attracted significant attention due to their promising stability and optoelectronic properties. However, the issue of poor charge transport in 2D perovskites limits its application. Here, studies on intermediate‐controlled crystal growth are reported to improve charge carrier transport in 2D perovskite thin films. It is shown that the coordination strength of solvents with perovskite precursor affects the initial state of intermediate phase formation as well as the subsequent perovskite layer growth. Tuning the solvent composition with a mixture (5:5) of dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) leads to the growth of highly orientated 2D perovskite films with much‐improved optoelectronic properties (faster transport by ≈50x, longer carrier lifetime by ≈4x, and lower defect density by ≈30x) than the film prepared with pure DMF. Consequently, perovskite solar cells based on DMF/DMSO (5:5) show >80% efficiency improvement than the devices based on pure DMF.

Ultrafast and low-temperature synthesis of patternable MoS2 using laser irradiation

The fascinating properties of transition metal dichalcogenides have been studied for a decade to broaden their promising applications as flexible electronics. However, conventional mass production of 2D materials is carried out at relatively high temperatures over 600 °C, which typical flexible substrates cannot withstand. For this reason, proper low-temperature synthesis methods must be developed. Here, we propose a fast and low-temperature synthesis method for metallic MoS2, which can be achieved on a flexible polyethylene terephthalate (PET) substrate. A precursor solution was prepared by a mixture of (NH4)2MoS4 powder and dimethylformamide. This solution was then coated on the silicon or PET substrate and an MoS2 film can be fabricated in unconstrained patterns such as lines or a continuous film at micro scale. The necessary laser power and exposure time were confirmed from systematic Raman spectroscopy measurements. The metallic behavior of the synthesized film was demonstrated by the electrical device fabrication and these excellent metallic properties show the feasibility of using MoS2 as a patternable electrode material on flexible substrates.

Electrospun Silybin Enriched Scaffolds of Polyethylene Oxide as Wound Dressings: Enhanced Wound Closure, Reepithelization in Rat Excisional Wound Model

Abstract: Aim/ Background: Wounds are considered as a common health problem due to their considerable burden on social life. Polymeric nanofibers have attracted attention in wound dressings due to their large surface area, smaller size and biocompatibility. The objective of this research is to develop silybin loaded polymeric scaffolds and further to check its efficacy in wound healing. Materials and Methods: Silybin loaded polymeric scaffolds was developed using polyethylene oxide as a polymer and glutaraldehyde as a crosslinker by electrospinning technique. It was characterized for scanning electron microscopy, differential scanning calorimetry, X-ray diffraction, swelling behavior, water uptake capacity and drug release kinetics. Further, in vivo studies were carried out on rats by excisional wound model. Histopathological studies were performed to investigate the healing process. Results: From the results of scanning electron microscopy, 3% Polyethylene oxide in dichloromethane: dimethyl formamide (8:2) mixture was selected for further characterization. Swelling index for prepared electrospun scaffolds was found to be 62.40%, whereas water uptake capacity was found to be 38.42%. Release kinetics suggested sustained release of silybin. The histopathological study indicated that silybin loaded scaffolds improved the results for granulation tissue score, wound maturity score, period of epithelisation and collagen distribution. Conclusion: It can be concluded that silybin enriched nanofibrous scaffold of polyethylene oxide is beneficial in topical applications to form the basis for new skin regenerating and wound healing. Key words: Nanofiber, Electrospinning, Scaffold, Silybin, Wound healing.

Printing High-Performance Tungsten Oxide Thin Film Ultraviolet Photodetectors on ZnO Quantum Dot Textured SiO2 Surface

A zinc oxide quantum dot (ZnO QD) texturing layer was printed on a SiO2 surface to resolve the issue of ink drop aggregation during inkjet printing tungsten oxide precursor (WO3Pr) ink, made from ultrasonicating ammonium metatungstate [(NH3)6H2W12O40]in a mixture of Dimethylformamide and water, for high-performance ultraviolet (UV) WO3 photoconductors. It was found that the ZnO QD textured surface offers a pinning effect of the WO3Pr ink and hence prevents the ink from aggregating and coagulating into large droplets, which prohibits formation of uniform WO3Pr films on hydrophobic SiO2/Si or glass substrates. With the ZnO QD texturing layer, a uniform WO3 film can be obtained when printing WO3Pr at room-temperature (22 °C), which reduced cracks and eliminated the coffee ring effect that arises when printing at elevated temperature such as 50 °C. High crystallinity was confirmed on the printed WO3 films, which leads to UV photoresponsivity up to 16.6 mA/W, which is comparable with the best reported on printed WO3 UV detectors without a ZnO QD texturing layer. This result shows surface texturing using a pre-printed QD layer provides a facile and compatible approach in controlling inkjet printing for high-quality oxide films directly from precursor solutions.

Preparation of Cu-BTC/PVA Fibers with Antibacterial Applications

In this study, a metal-organic framework (MOF)/polymer electrospun fiber was prepared. The MOF, copper-1,3,5- benzenetricarboxylate (Cu-BTC), was synthesized using a sonochemical method at 25 °C, with a 1:1:1 mixture of dimethylformamide, ethanol, and deionized water as solvent. The sonication time was shown to have a pronounced effect on the morphology and structure of the Cu-BTC. A square pyramid shape with sides of 100 nm was obtained after 2 h of sonication. Extending the sonication time provided a lower amount of unknown phase and produced a uniform Cu-BTC framework. The Cu-BTC-modified PVA fibers were then fabricated by electrospinning. The effect of the Cu-BTC and PVA concentration was investigated at 25 kV, a flow rate of 10 μl/min, and a working distance of 150 mm. FTIR spectra and FESEM images showed good dispersion of the Cu-BTC on the PVA fiber. The as-prepared Cu-BTC-modified PVA fibers exhibited excellent antibacterial effectiveness against S. aureus.

ASSESSMENT OF THE COMPOSITION OF AQUEOUS-ORGANIC MIXTURES END EXTRACTION PHASES BY SOLVATOCHROMISM OF 4-[(OCTYLYLPYRIDINIUM)ETHENYL]PHENOLATE DYES

This work deals with the investigation of assesment of the composition of aqueous dimethylformamide mixtures based on solvatochromic shift of some 4-hydroxystyryl dyes. The purity of the studied dyes was tested. Spectrophotometrical, protolytycal and solvatochromic properties of the ОР4-MS and OP4-DMS dyes were investigated. The transformation from the protonated to merocyanine form is accompanied by bathochromic shift. Absorption maxima of the cationic and merocyanine forms in aqueous solutions and acidity constants (pK a ) of the investigated dyes have been determined by specrophotometric method. Ratiometric functions were investigated for the selection of the best quantitative parameter that binds the composition of the mixtures (water content) with solvatochromic shifts of the dyes. Correlation coefficients (R 2 ) are greater than 0.99. It is noted that the color of merocyanine forms of dyes depends on the composition of water-organic solutions ranging from pink to blue in the transition from water to a pure solvent, which allows to set the composition of the mixtures. The possibilities of determining the composition of mixed solutions using colorimetric scales and by processing spectrophotometric data are discussed.

Volumetric properties of non-aqueous binary mixture of diethanolamine (DEA) and dimethylformamide (DMF)

This paper reports the volumetric properties such as density, molar volume and isobaric thermal expansion of non-aqueous system of DMF-DEA. The values of volumetric properties were reported for several mole fractions of DMF (x1) and DEA (x2) and temperature from 298.15 to 343.15 K. In order to investigate the significance of temperature and concentration on the each volumetric property and develop regression models, a user-defined method of response surface methodology (RSM) was applied. A predictive equation called Jouyban-Acree model (JAM) was used to predict the volumetric properties of the binary mixture. The accuracy and capability of JAM were compared with regression model. The results revealed that JAM is capable of correlating volumetric properties very well and is an accurate model for prediction of the volumetric properties of the binary mixture. The analysis of variance (ANOVA) results showed that temperature and concentration are highly significant and have the strong influence on the volumetric properties. The investigation of experimental data shows that the density and molar volume values increase with rising in the concentration of DEA in the mixture, while isobaric thermal expansion values decrease. Moreover, there was an increasing trend on the values of molar volume and isobaric thermal expansion as the temperature increased, whereas the density of binary mixture decreased with an increase in temperature.

Synthesis of β-Bromo-Substituted Cu(II) Tetraphenylporphyrinates

Bromination reactions of Cu(II) 5,10,15,20-tetraphenylporphyrinate with N-bromosuccinimide in chloroform and chloroform–dimethylformamide mixture and complexation of 2-bromo-5,10,15,20-tetraphenylporphyrin and 2,3,12,13-tetrabromo-5,10,15,20-tetraphenylporphyrin with copper(II) acetate in dimethylformamide have been studied. Mono-, tetra-, and octabromo-substituted Cu(II) porphyrinates have been synthesized. Obtained compounds have been identified by electronic absorption spectroscopy, IR spectroscopy, mass spectrometry, and elemental analysis.

The Henry reaction catalyzed by NiII and CuII complexes bearing arylhydrazones of acetoacetanilide

The new nickel coordination polymer [Ni(HL1) (CH3OH)2]n (1) and co-crystal H3L1∙DMF (2) were obtained by reaction of NiCl2·2H2O with 2-(2-(1,3-dioxo-1-(phenylamino)butan-2-ylidene) hydrazineyl)benzoic acid (H3L1) in the presence and absence of triethylamine, respectively, in a mixture of methanol and dimethylformamide (DMF) (20:1, v/v). Reaction of CuCl2·2H2O with H3L1 in the presence of 2,2'-(methylazanediyl)bis (ethan-1-ol) (HR) in methanol yields [Cu(HR)2(H2L1)2] (3), whereas treatment of this copper salt with sodium 2-(2-(1,3-dioxo-1-(phenylamino)butan-2-ylidene)hydrazineyl)benzenesulfonate (NaH2L2) in a mixture of acetone and water (10:1, v/v) produces [Cu(HL2) (H2O)2]∙2(H2O)∙{(CH3)2C = O} (4). Compounds 1−4 were characterized by IR and ESI-MS spectroscopies, elemental and X-ray crystal structural analyses, and tested as catalyst for the Henry reaction of aliphatic and aromatic aldehydes with nitroethane in different solvents such as acetonitrile, methanol or water. Good yields (up to 87%) and diasteroselectivities (syn/anti 77:23) were observed in the reactions catalyzed by 3 in water.

Solvent-cast 3D printing of polysulfone and polyaniline composites

Polysulfone (PSU) and polysulfone/polyaniline (PANI) composites were 3D printed by solvent-cast direct write deposition. Traditional material extrusion techniques require the application of heat to melt the polymer during extrusion and printing. This type of thermal processing poses potential limitations for printing polymers that have high processing temperatures or thermally degrade. PSU is a thermally stable polymer, but has an elevated glass transition temperature of 185–190 °C and is highly viscous in the melt. On the other hand, polyaniline is a semiconducting polymer that thermally degrades before melting By using solvent-based inks, PSU and PSU/PANI composites were 3D printed at room temperature using direct write deposition. PSU inks consisted of PSU dissolved in a mixture of dichloromethane (DCM) and dimethylformamide (DMF). The DCM evaporated quickly to harden the extruded filament, while the DMF evaporated slowly to allow for a smoother extruded filament and more consistent extrusion with well-bonded layers. Best results were obtained with PSU concentrations at 35–40 wt% with a DCM:DMF volume ratio of 5:1. The optimized PSU/PANI inks consisted of 30 wt% undoped PANI, and 35 wt% doped PANI, with 20 wt% PSU solution in dichloroethane (DCE) used as a binder. Using capillary viscometry it was confirmed that the inks exhibited pseudoplastic behavior, which is expected for polymer solutions and melts. It was shown that objects printed using the PSU/PANI ink are not conductive when undoped PANI was used, but became conductive when the PANI powder was first doped in 1 M H2SO4 before printing. A resistivity of 4.83 Ω-m was achieved with an ink containing 35 wt% doped PANI and 13 wt% PSU.