Enhancing performance of polyacrylonitrile membranes for pervaporation dehydration of ethanol by tailoring morphology and process parameters

Seyed Mohammad Hosseini Nejad,Amir Hossein Mostafavi,Seyed Saeid Hosseini,Haoze Zeng,Lu Shao 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10

Development of high performance membranes for ethanol (EtOH) dehydration constitutes one of the main applications of pervaporation technology. In the present study, the properties of membranes derived from PAN were examined for this purpose. Heat treatment and variation of operational parameters were explored as viable strategies for enhancing the process performance. The characteristics of the membranes including morphology, thickness and sorption behavior were investigated in detail to identify their roles. Application of heat treatment with regards to polymer Tg resulted in membranes with distinct morphological and sorption characteristics. Increase in operational temperature was found effective for optimizing the opposing trends of permeate flux and separation factor. The maximum PSI value for the pristine PAN membrane was 5,564.0 g·m−2h−1, which occurred for operation at 50 °C. Also, application of heat treatment led to drop in flux and increase in separation factor by which PSI reached 41.3 kg·m−2h−1, which was 7.5 times than that of pristine PAN membrane. This study demonstrates successful implementation of facile strategies for tuning the characteristics and performance of membranes derived from PAN for efficient dehydration of EtOH via pervaporation process.

A Modular DC-DC Converter with Zero Voltage Switching Capability

Seyed Hossein Hosseini,Farzad Sedaghati,Mehran Sabahi,G. B. Gharehpetian 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10

A Modular DC-DC converter with a high-frequency link and bidirectional power flow capability is presented in this paper. Zero voltage switching (ZVS) operation without using any auxiliary circuit, is one of the most important specifications of the proposed modular DC-DC converter. Also, compatibility for high power applications and less number of switching devices are the other merits of the proposed converter. ZVS analysis of the modular converters is necessary because of their high power applications and high number of power switches. The ZVS condition of the proposed modular DC-DC converter is studied and its criteria are derived in detail. The operation principle of the proposed converter, and its ZVS operation are verified using both simulation and experimental measurement.

Design of a New Extended Zeta Converter with High Voltage Gain for Photovoltaic Applications

Seyed Hossein Hosseini,Rasoul Shalchi Alishah,Naser Vosoughi Kurdkandi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

In this paper, a new extended zeta converter with the potential of high voltage gain for photovoltaic applications is presented. The proposed topology consists of an extended high voltage gain converter along with a Zeta converter. The extended high voltage gain converter is operated with a fixed conversion gain whereas the zeta converter is controlled to do the maximum power point tracking (MPPT) which is an important advantage of proposed structure. The input current of the proposed topology is continuous and its voltage gain is high without using any transformer. Reduction of the number of power electronic switches and costs are other most important benefits of the proposed structure. To show the merits of proposed topology, obtained results are compared with other similar structures. The operation of proposed converter is verified using experimental results.

Molybdenum Disulfide Nanoflake–Zinc Oxide Nanowire Hybrid Photoinverter

Hosseini Shokouh, Seyed Hossein,Pezeshki, Atiye,Raza, Syed Raza Ali,Choi, Kyunghee,Min, Sung-Wook,Jeon, Pyo Jin,Lee, Hee Sung,Im, Seongil American Chemical Society 2014 ACS NANO Vol.8 No.5

<P>We demonstrate a hybrid inverter-type nanodevice composed of a MoS<SUB>2</SUB> nanoflake field-effect transistor (FET) and ZnO nanowire Schottky diode on one substrate, aiming at a one-dimensional (1D)–two-dimensional (2D) hybrid integrated electronic circuit with multifunctional capacities of low power consumption, high gain, and photodetection. In the present work, we used a nanotransfer printing method using polydimethylsiloxane for the fabrication of patterned bottom-gate MoS<SUB>2</SUB> nanoflake FETs, so that they could be placed near the ZnO nanowire Schottky diodes that were initially fabricated. The ZnO nanowire Schottky diode and MoS<SUB>2</SUB> FET worked respectively as load and driver for a logic inverter, which exhibits a high voltage gain of ∼50 at a supply voltage of 5 V and also shows a low power consumption of less than 50 nW. Moreover, our inverter effectively operates as a photoinverter, detecting visible photons, since MoS<SUB>2</SUB> FETs appear very photosensitive, while the serially connected ZnO nanowire Schottky diode was blind to visible light. Our 1D–2D hybrid nanoinverter would be quite promising for both logic and photosensing applications due to its performance and simple device configuration as well.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-5/nn501230v/production/images/medium/nn-2014-01230v_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn501230v'>ACS Electronic Supporting Info</A></P>

Particle Swarm Optimization and Finite-Element Based Approach for Induction Heating Cooker Design

Seyed Hossein Hosseini,Atabak Mashhadi Kashtiban,Ghasem Alizadeh 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

Harmonic Optimization of Asymmetrical Voltage-Cancellation Control for Full-Bridge Series Resonant Inverters

Seyed Hossein Hosseini,Ali Yazdanpanah Goharrizi 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

A novel preparation of polyaniline in presence electric and magnetic fields

Hosseini, Seyed Hossein,Gohari, S. Jamal Techno-Press 2013 Advances in materials research Vol.2 No.4

We have described primary studies on conductivity and molecular weight of polyaniline separately in the electric and magnetic fields when it is used in a field effect experimental configuration. We report further studies on doped in-situ deposited polyaniline. First we have chemically synthesized polyaniline by ammonium peroxodisulfate in acidic aques and organic solutions at different times. Then we measured mass and conductivity and obtained the best time of polymerizations. In continue, we repeated these reactions separately under different electric and magnetic fields in constant time and measured mass and conductivity. The polyaniline is characterized by gel permeation chromatography (GPC), UV-Visible spectroscopy and electrical conductivity. High molecular weight polyanilines are synthesized under electric field, $M_w$ = 520000-680000 g/mol, with $M_w/M_n$ = 2-2.5. The UV-Visible spectra of polyanilines oxidized by ammonium peroxodisulfate and protonated with dodecylbenzenesulfonic acid (PANi-DBSA), in N-methylpyrolidone (NMP), show a smeared polaron peak shifted into the visible. Electrical conductivity of polyanilines has been studied by four-probe method. The conductivity of the films of emeraldine protonated by DBSA cast from NMP are higher than 500 and 25 S/cm under 10 KV/m of potential) electric field and 0.1 T magnetic field, respectively. It shows an enhanced resistance to ageing too. By the next steps, we carried chemical polymerization at the best electric and magnetic fields at different times. Finally, resulted in finding the best time and amount of the fields. The longer polymerization time and the higher magnetic field can lead to degradation of polyaniline films and decrease conductivity and molecular mass.

Synthesis of conducting and magnetic nanocomposite of cross-linked aniline sulfide resin

Hosseini, Seyed Hossein Techno-Press 2014 Advances in materials research Vol.3 No.4

Magnetic and conducting aniline sulfide resin cross-linked (ASC-Fe3O4) nanocomposite has been prepared in the presence of aniline sulfide resin (ASR), aniline, $Fe_3O_4$ coated by polyethylene glycol (PEG) and initiator. The magnetic properties of the resulting composites showed ferromagnetic behavior, such as high-saturated magnetization (Ms= 41 emu/g), and coercive force (Hc=1.5 Oe). The saturated magnetization was increased by increasing of $Fe_3O_4$ content and decreased by increasing aniline ratio. The transmission electron micrograph (TEM) and X-ray diffraction proved that nanometer-sized about 20-30 nm $Fe_3O_4$ in the composite. The average size of ASC-$Fe_3O_4$ nanocomposite with core-shell structure was about 50-60 nm, and polydisperse. This approach may also be extended to the synthesis and modification of other polymers. Electrical conductivity of aniline sulfide resin cross-linked (ASC) nanocomposite has been studied by four-point probe method and produced $3.3{\times}10^{-4}S/cm$ conductivity for it. The conductivity of the composites at room temperature depended on the $Fe_3O_4$, aniline ratio and doping degree. The thermogravimetry analysis (TGA) results showed that this resin is thermal resistance near of $500^{\circ}C$. So, It can be used for resistance thermal coating for military applications. $Fe_3O_4$-PASC nanocomposite has been flexible structure with electrical and magnetic properties.

Investigation of microwave absorbing properties for magnetic nanofiber of polystyrenee-polyvinylpyrrolidone

Seyed Hossein Hosseini,Mahsa Sadeghi 한국물리학회 2014 Current Applied Physics Vol.14 No.7

Aligned magnetic blend of polystyreneepolyvinylpyrrolidone (PSePVP) nanofibers were prepared by this method. First, polystyreneepolyvinylpyrrolidone (PSePVP) blend solution in THF was synthesized. Then magnetic of PSePVPeFe3O4epolyethylene glycol (PEG) was prepared by masking method. Finally, magnetic nanofiber of PSePVPeFe3O4ePEG was prepared by electrospinning method, too. An electric potential difference of 25 kV was applied between the collector and a syringe tip, and the distance between the collector and the tip was 13 cm. Fe3O4 is exhibit various magnetic properties of which the complex permeability and the permittivity, in particular, are important in determining their high frequency characteristics. The magnetic oxide particles and nanofiber of nanometer size were characterized by TEM and SEM respectively. The thermal properties of nanofibers were determined by TGA and DSC. The magnetic characterization of the fibers was also performed by VSM and AFM techniques. On the other hand, nanofiber with diameters ranging from 30 to 40 nm, showing at room temperature, coercive field values of around 25 kV and saturation magnetization was 1.1 emu/g. Microwave reflection loss of the sample was tested at 8e12 GHz microwave frequencies and the results showed that magnetic nanofiber possessed the microwave absorbing properties.

Non-classical logic inverter coupling a ZnO nanowire-based Schottky barrier transistor and adjacent Schottky diode

Hosseini Shokouh, Seyed Hossein,Raza, Syed Raza Ali,Lee, Hee Sung,Im, Seongil The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.31

<P>On a single ZnO nanowire (NW), we fabricated an inverter-type device comprising a Schottky diode (SD) and field-effect transistor (FET), aiming at 1-dimensional (1D) electronic circuits with low power consumption. The SD and adjacent FET worked respectively as the load and driver, so that voltage signals could be easily extracted as the output. In addition, NW FET with a transparent conducting oxide as top gate turned out to be very photosensitive, although ZnO NW SD was blind to visible light. Based on this, we could achieve an array of photo-inverter cells on one NW. Our non-classical inverter is regarded as quite practical for both logic and photo-sensing due to its performance as well as simple device configuration.</P> <P>Graphic Abstract</P><P>On a single ZnO nanowire, we fabricated bifunctional non-classical inverters coupling nanowire-based Schottky barrier transistors and adjacent Schottky diodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp01266f'> </P>