Untitled

Iovleva, M. M.; Смирнова, В. Н.; Budnitskii, G. A.

doi:10.1023/a:1012934313303

Cited by 42 publications

(17 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[54] Experimental evidence indicates that at 20 °C the quality of DMF, DMSO and DMAc solvents is strongly dynamic and depends on the PAN concentration along with the molecular weight. [55] At concentrated polymer solutions (~10 wt%), the PAN solubility was reported as DMAc > DMSO > DMF, however, without reporting the molecular weight and contrary to what is expected from simulations (Figure 2d-f). The trend in conformations and solubility from simulations DMF > DMSO > DMAc was instead observed for polymer solutions of concentrations lower than 5 wt% [55] and the trend DMSO > DMF > DMAc, found here for 1 wt.% and consistent with DMSO > DMF by another experimental group, [51] was not observed in ref.…”

Section: Pan-cnt Interactions At 10 Wt% Pan Concentration Two Competitive Processesmentioning

confidence: 62%

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

Pramanik

Jamil

Gissinger

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

Polyacrylonitrile (PAN) is among the most promising precursor polymers to produce strong and lightweight carbon fiber. Conformations in solution and the extent of binding to carbon nanotubes (CNTs) are critical during gel spinning and for alignment of graphitic layers upon carbonization. First quantitative insights into these processes are reported using molecular dynamics simulations from the atomic scale including virtual π electrons and comparisons to experimental data. Common solvents for fiber spinning induce significant differences in PAN conformations in dilute solution at 25 C with persistence lengths between 0.5 and 2 nm.Variations in conformation become smaller at 75 C, in the presence of CNTs, and at higher PAN concentration. "Aging" of PAN conformations in dimethylformamide and dimethylsulfoxide at higher temperature is explained and a correlation between extended polymer conformations and increased binding to CNTs identified in dilute solutions. PAN is overall barely attracted to CNTs under common solution conditions and enters significant surface contact only at higher concentration as solvent is physically removed. The impact of temperature is small, whereby binding increases at lower temperature. The results provide first guidance to control interactions of polymers with CNTs to induce distinct conformations and specific binding at the early stages of assembly.

show abstract

Section: Pan-cnt Interactions At 10 Wt% Pan Concentration Two Competitive Processesmentioning

confidence: 62%

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

Pramanik

Jamil

Gissinger

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…15,16 dimethylacetamide, and dimethyl sulfoxide, but completely soluble in DMF at a high concentration. 18 In a previous article, 19 we reported that the effect of concentrations ranging from 7.5 to 12% w/w on the synthesis of PAN copolymer. Nanofibers synthesized with electrospinning are low cost, continuous, and easy to align and assemble, and they are used in many applications, such as wound dressings, filtration, drug delivery, reinforcement, catalysis, electronic and optical devices, and biomedical and pharmaceutical applications.…”

Section: Introductionmentioning

confidence: 96%

“…Among the various studied polymers, polyacrylonitrile nanofibers (PANnf's) have received significant attention because of their unique features, including their higher carbon yield, excellent solubility, higher mechanical properties, and higher thermal stability . Polyacrylonitrile (PAN) polymer is soluble in aprotic solvents, such as dimethylformamide (DMF), dimethylacetamide, and dimethyl sulfoxide, but completely soluble in DMF at a high concentration . In a previous article, we reported that the effect of concentrations ranging from 7.5 to 12% w/w on the synthesis of PAN copolymer.…”

Section: Introductionmentioning

confidence: 99%

Functionalized polyacrylonitrile‐nanofiber based immunosensor for Vibrio cholerae detection

Gupta

Dhakate

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyacrylonitrile nanofibers (PANnf's) were electrospun directly onto an indium tin oxide (ITO)‐coated glass substrate. The PANnf/ITO electrode was partially hydrolyzed with an NaOH aqueous solution at ambient temperature to convert the nitrile groups of the PANnf's into carboxyl groups was confirmed by Fourier transform infrared spectroscopy. Furthermore, 1‐ethyl‐3‐(3‐dimethylaminopropyl) carbodiimide–N‐hydroxy succinimide chemistry was used to activate the COOH groups of PANnf's for the covalent co‐immobilization of monoclonal antibodies against Vibrio cholerae and bovine serum albumin for V. cholerae toxin detection. Structural, functional, and electrochemical studies of the PANnf/ITO electrode and BSA/Ab/PANnf/ITO immunoelectrode were performed, and found a uniform distribution of nanofibers with diameter of 325 ± 7.7% nm. The electrochemical response studies showed an improved sensing performance of the immunoelectrode with a detection of 6.25–500 ng/mL, a low limit of detection of 0.22 ng/mL, a sensitivity of 90 nA ng−1 mL cm−2, an association constant of 45.2 ng/mL, and a dissociation constant of 8 ng/mL. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44170.

show abstract

“…The solvents in which PAN can be dissolved are polar solvents such as dimethylformamide (DMF) [12], dimethyl sulfoxide (DMSO) [13], dimethylacetamide (DMAc) [14], dimethyl sulfone, tetramethyl sulfide, and aqueous solutions of ethylene carbonate and some mineral salts [15,16]. This makes PAN very useful for a wide range of different applications [17,18]. According to scientific literature, most of the nanofibers are spun from toxic solvents such as DMF and DMAc [19], and only some papers report the use of the low-toxic solvent DMSO [20].…”

Section: Introductionmentioning

confidence: 99%

Investigation of metallic nanoparticle distribution in PAN/magnetic nanocomposites fabricated with needleless electrospinning technique

Trabelsi

Mamun

Klöcker

et al. 2021

cdatp

View full text Add to dashboard Cite

Needleless electrospinning can be used to produce polyacrylonitrile nanofibres, for example, to which magnetic nanoparticles can additionally be added. Such composite nanofibres can then be stabilised and carbonised to produce carbon composite nanofibres. The magnetic nanoparticles have an influence not only on the structure but also on the mechanical and electrical properties of the finished carbon nanofibres, as does the heat treatment during stabilisation and incipient carbonisationThe present study reports on the fabrication, heat treatment and resulting properties of poly(acrylonitrile) (PAN)/magnetic nanofibre mats prepared by needleless electrospinning from polymer solutions. A variety of microscopic and thermal characterisation methods were used to investigate in detail the chemical and morphological transition during oxidative stabilisation (280 °C) and incipient carbonisation (500 °C). PAN and nanoparticles were analysed during all stages of heat treatment. Compared to pure PAN nanofibres, the PAN/ magnetic nanofibers showed larger fiber diameters and the presence of beads and agglomerations. In this study, magnetic nanofibers were investigated in more detail with the aim of detecting undesired agglomerations. Visual observation, for example with CLSM or SEM, does not provide conclusive evidence of agglomerations in the nanofibers. But based on the capabilities of SEM/EDS many different types of samples can be easily analysed where other analytical techniques simply cannot give the fast answer.

show abstract

Untitled

Cited by 42 publications

References 1 publication

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

Functionalized polyacrylonitrile‐nanofiber based immunosensor for Vibrio cholerae detection

Investigation of metallic nanoparticle distribution in PAN/magnetic nanocomposites fabricated with needleless electrospinning technique

Contact Info

Product

Resources

About