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  1. 2 Engineering of Biomaterials
  2. 2 Physicochemical Problems of Mineral Processing
  3. 1 Acta Mechanica et Automatica
  4. 1 Acta of Bioengineering and Biomechanics
  5. 1 Cement Lime Concrete
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  1. 2 Bastrzyk A.
  2. 2 Kozlecki T.
  3. 2 Pielichowski K.
  4. 2 Polowczyk I.
  5. 2 Sadowski Z.
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  1. 2 2023
  2. 2 2022
  3. 3 2021
  4. 1 2018
  5. 1 2017
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1
Content available Effectiveness of polyethylene glycol-coated silica on ions adsorption in industrial wastewater
Maryudi Maryudi, Rahayu Aster, Hakika Dhias Cahya
Polimery
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2023
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Vol. 68, nr 5
259--263
EN
The effect of coating silica with polyethylene glycol on the adsorption of iron and phosphate ions in industrial wastewater was investigated. Variable factors were temperature and time of coating, PEG concentration, and PEG to silica ratio. Infrared spectroscopy and scanning electron microscopy were used to evaluate the chemical structure and morphology of PEG-coated silica. Optimum iron and phosphate ions removal efficiency was obtained using a coating temperature of 50°C, a coating time of 15 min, a PEG concentration of 20%, and a PEG to silica ratio of 1:3.
PL
Zbadano wpływ powlekania krzemionki glikolem polietylenowym na adsorpcję jonów żelaza i fosforanów ze ścieków przemysłowych. Czynnikami zmiennymi były temperatura i czas powlekania, stężenie PEG oraz stosunek PEG do krzemionki. Do oceny budowy chemicznej i struktury krzemionki powlekanej PEG stosowano spektroskopię w podczerwieni i skaningową mikroskopię elektronową. Optymalną skuteczność usuwania jonów żelaza i fosforanów uzyskano stosując temperaturę powlekania 50°C, czas powlekania 15 minut, stężenie PEG 20% oraz stosunek PEG do krzemionki 1:3.
2
Content available Preparation of Electrospun Composite PEG/PVP Phase-Change Nanofibers and their Application in Cigarette Cooling Filters
Chen Chen, Li Liqun, Qiao Yuemei, Guo Chunsheng, Ye Yajun, Du He
Fibres & Textiles in Eastern Europe
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2023
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Vol. 31, no. 3
9-13
EN
Composite phase-change nanofibers were prepared by electrospinning with polyethylene glycol (PEG) as the phase-change material (PCM) and polyvinylpyrrolidone (PVP) as the carrier matrix. The high PEG content endowed the nanofibers with an excellent cooling effect and significantly reduced the smoke temperature. For PEG70/PVP nanofibers, the smoke temperature can be decreased 45℃ at the 8th puff, and be kept below 45℃. The cooling test proved that the electrospun PEG/PVP phase-change nanofibers exhibited a desirable cooling performance, improving the comfort of cigarette products. And the composite PEG/PVP phase-change nanofibers present great potential as the cooling cigarette filter material for HnB tobacco application.
3
Content available remote Influence of PEG-coated Bismuth Oxide Nanoparticles on ROS Generation by Electron Beam Radiotherapy
Sisin Noor Nabilah Talik, Anuar Muhammad Afiq, Dollah Norhayati, Razak Khairunisak Abdul, Algethami Merfat, Geso Moshi, Rahman Wan Nordiana
Polish Journal of Medical Physics and Engineering
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2022
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Vol. 28, Iss. 2
69--76
EN
Introduction: Nanoparticles (NPs) have been proven to enhance radiotherapy doses as radiosensitizers. The introduction of coating materials such as polyethylene glycol (PEG) to NPs could impact the NPs’ biocompatibility and their effectiveness as radiosensitizers. Optimization of surface coating is a crucial element to ensure the successful application of NPs as a radiosensitizer in radiotherapy. This study aims to investigate the influence of bismuth oxide NPs (BiONPs) coated with PEG on reactive oxygen species (ROS) generation on HeLa cervical cancer cell line. Material and methods: Different PEG concentrations (0.05, 0.10, 0.15 and 0.20 mM) were used in the synthesis of the NPs. The treated cells were irradiated with 6 and 12 MeV electron beams with a delivered dose of 3 Gy. The reactive oxygen species (ROS) generation was measured immediately after and 3 hours after irradiation. Results: The intracellular ROS generation was found to be slightly influenced by electron beam energy and independent of the PEG concentrations. Linear increments of ROS percentages over the 3 hours of incubation time were observed. Conclusions: Finally, the PEG coating might not substantially affect the ROS generated and thus emphasizing the functionalized BiONPs application as the radiosensitizer for electron beam therapy.
4
Content available Preliminary Investigation of Bioplastics from Durian Seed Starch Recovery Using PEG 400 for Reducing Marine Debris
Apriani Mirna, Cahyono Luqman, Utomo Agung Prasetyo, Nugraha Anggara Trisna, Alfira Dwi Cahya Ningrum
Journal of Ecological Engineering
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2022
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Vol. 23, nr 2
12--17
EN
Plastic is a source of pollution both on land and sea that can disrupt balance of the ecosystem. The characteristic of plastic as a material is difficult to decompose causing problems for environment. Various research needed to produce bioplastics that easily biodegradable in about 60 days. Biodegradable plastics are made from organic materials in the form of starch. Durian seed starch is one of the potential raw materials that can be used as bioplastics. Durian fruit is one of the typical fruits in Indonesia, at present seeds of durian had not been used as raw materials to produce object with economic values. It is necessary to combine the processing of durian seeds through a recovery approach in the form of processing into bioplastics. The aim of study is to analyze the effect of adding PEG 400 as a plasticizer plus calcium carbonate as a solidifier. Tests were carried out on swelling ability, acid and base resistance, tensile strength and biodegradation. The variation of the addition of PEG 400 is 4%; 30%; 50% and 70% were carried out to analyze the effect of different concentrations of plasticizers. None of the tensile test results met SNI 7188-11:2018 but all variations had biodegradation values according to SNI 7188-11:2018. Swelling test resulted from 4% and 30% are 1.2% and 2.1% respectively.
5
Content available Zastosowanie zielonych rozpuszczalników w syntezie nienasyconych związków boro- i krzemoorganicznych na drodze reakcji hydrometalacji i sprzęgania Marcińca
Walkowiak Jędrzej
Wiadomości Chemiczne
|
2021
|
[Z] 75, 1-2
111--136
EN
Unsaturated organoboron and organosilicon compounds constitute an important class of organometallic compounds, which due to the presence of silyl- or boryl- group attached to Csp2 atoms, their simple and straightforward transformations in coupling and demetallation reactions, found a broad range of applications in the synthesis of fine chemicals or new materials with tailored properties. Such compounds might be synthesized in many transformations but two of them: hydrometallation and Marciniec coupling reactions permitted to obtain compounds with high effectivity, selectivity, and in the case of hydrometallation reactions with excellent atom economy. Most of these processes occur in a homogeneous phase, which ensures excellent yields and stereo- and regioselectivity. On the other hand, such conditions generate problems with catalyst reuse, product separation, and substantial consumption of toxic, volatile organic solvents. According to the assumptions of sustainable development in chemistry, the new procedures, which allow to intensify the process in terms of its efficiency, according to green chemistry rules are of prior importance in modern chemical industry. In this manuscript, the newest achievements in the application of green solvents (ionic liquids, liquid polymers, and supercritical CO2) in catalytic hydrometallation of alkynes and coupling of vinylmetalloids with olefins are discussed. Such an approach builds a new strategy for effective catalyst immobilization and its reuse, the increase of process productivity by the application of repetitive batch processes, and elimination of organic solvents, typically used in these transformations. Selected contributions in this field of chemistry are presented within this review.
6
Content available Effect of polyethylene glycol on surface coating of Ta2O5 onto titanium substrate in sol-gel technique
Dommeti Vamsi, Pramanik Sumit, Roy Sandipan
Acta of Bioengineering and Biomechanics
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2021
|
Vol. 23, no. 1
197--206
EN
Purpose: Recently, titanium (Ti) and its alloys have been widely used in dental and surgical implants in the last few decades. However, there is a loosening effect over a long period usage. Therefore, the present study aimed to increase life of an implant by its surface modification. Methods: In present study, sol-gel process has been applied to create tantalum pentoxide (Ta2O5) layer coating on Ti-substrate. In this technique, polyethylene glycol (PEG) plays an important role to form uniform porous coating, which can have potential application in formation of strong bonding to the natural bone. Results: Microstructural, elemental, structural and binding energy results showed that the material with 100% PEG-enhanced sol-gel Ta2O5 with spin coating onto Ti substrate followed by an optimized sintering temperature (500 °C) has better porous structure than that of 5% PEG-enhanced sol-gel Ta2O5 coating, and would be suitable for tissue in-growth properties. Conclusions: Therefore, it was concluded that the present spin coated 100% PEG-enhanced Ta2O5 coating onto Ti, having the most suitable morphology with enhanced roughness, could be noteworthy for potential tissue in-growth and it could provide desired bonding at the interface of Ti-implant coating and host tissues in biomedical applications.
7
Content available Comparative study of the parallel and angular electrical gripper for industrial applications
Fotuhi Mohammad Javad, Bingul Zafer
Acta Mechanica et Automatica
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2021
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Vol. 15, no. 2
66--73
EN
The aim of this paper is to study the position and power performances of an electrical lead screw-driven industrial gripper mechanism (LSDIGM). This work consists of designing and developing an electrical LSDIGM that has the potential to meet various demands in the automation industry and factories. The performances of both angular electrical gripper (AEG) and parallel electrical gripper (PEG) mechanisms were compared based on their position and power efficiency. The position efficiency of these electrical LSDIGM is computed from the position root mean square error (PRMSE) obtained from errors between the two measured positions (input incremental encoder and output linear encoder). In the experimental setup, a current sensor and a spring were employed to measure the current in the input of the system and the stiffness in the output of the system, respectively. The electrical power in the input of the electrical LSDIGM and the mechanical power in the output of the LSDIGMs were calculated using the current and the spring force, respectively. Finally, the power efficiency of these electrical LSDIGMs was examined and compared at different velocity circumstances.
8
Content available Wpływ ciężaru cząsteczkowego i ilości glikolu polietylenowego na właściwości mas lejnych z SiC
Wiśniewski P., Antosiewicz W., Sitek R., Mizera J.
Szkło i Ceramika
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2018
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R. 69, nr 3
11--14
PL
W artykule przedstawiono wyniki badań właściwości mas formierskich z węglika krzemu przeznaczonych do otrzymywania elementów silników lotniczych metodą odlewania precyzyjnego. Całkowite stężenie fazy stałej w ceramicznych masach lejnych z SiC wynosiło 60% wag. Spoiwem konstrukcyjnym była nanodyspersja polimerowo-ceramiczna zawierająca koloidalny Al2O3. Jako spoiwa modyfikujące zastosowano wodne roztwory glikolu polietylenowego (PGE) o ciężarach cząsteczkowych 6000, 10000 i 20000 g/mol, które dodawano w ilościach 5%, 10% i 15% wagowych w stosunku do proszku. Proszek SiC charakteryzowano pod względem: wielkości cząstek metodą dyfrakcji laserowej i za pomocą skaningowego mikroskopu elektronowego (SEM) oraz składu fazowego i chemicznego za pomocą dyfraktometrów rentgenowskich XRD i XRF. Masy formierskie charakteryzowano pod względem: lepkości dynamicznej, czasu wypływu oraz adhezji do płyty (tzw. test płyty) i grubości warstwy. Pomiary te przeprowadzano przez 96 h w warunkach laboratoryjnych w temperaturze 21ºC. Otrzymane wyniki pokazały, że masy lejne z SiC zawierające nanodyspersję oraz PGE charakteryzują się obiecującymi właściwościami i mają szansę zostać zastosowane w odlewnictwie precyzyjnym.
EN
In the present paper properties of silicon carbide slurries in manufacturing shell moulds for investment casting of aircraft turbine elements were studied. Ceramic SiC slurries with a solid concentration of 60 wt. % were applied. As a structural binder nanodispersion containing colloidal Al2O3 was used. The poly(ethylene glycol) (PGE) with molecular weight 6000, 10000 and 20000 g/mol as a rheological modificators were added at different amount: 5, 10, 15 wt. %. Characterization of SiC powder were made by: grain size by laser diffraction, Scanning Electron Microscopy (SEM) and X-Ray diffraction (XRD, XRF) methods. The properties of ceramic slurries such as: relative and dynamic viscosity, plate (plate weight test) and wax adhesion were studied by a range of techniques. These measurements were taken in laboratory conditions by 96 hours at temperature 21ºC. The results shows that SiC-based slurries, nanodispersion binder and PGE meet the investment casting requirements of aircraft turbine parts and had promising properties.
9
Content available remote Zastosowanie glikolu polietylenowego jako domieszki utrudniającej parowanie wody z betonu samozagęszczającego się
Swamy Naga Ratna Giri P., Rajesh Kumar G., Sri Rama Chand M., Rathish Kumar P.
Cement Wapno Beton
|
2017
|
R. 22/84, nr 1
26--38
PL
Z odkrytych powierzchni betonu zachodzi w sposób ciągły parowanie wody na skutek różnicy ciśnienia pary wodnej w powietrzu i nad wodą na powierzchni betonu. Powoduje to zmniejszenie stosunku w/c w betonie co może powodować niepełną hydratację cementu i pogorszenie jakości betonu. W związku z tym pielęgnacja betonu jest jednym z najważniejszych zabiegów zapewniających dobre właściwości betonu. Samo-pielęgnacja betonu jest jedną z form specjalnego betonu, która zmniejsza wpływ niedostatecznej pielęgnacji spowodowanej źle wyszkoloną kadrą, brakiem wody, lub jej złą jakością. W artykule omówiono zasady stosowania domieszki poli(glikolu etylenowego) o różnej masie cząsteczkowej, dodawanego do mieszanki betonowej, w celu zapewnienia samo-pielęgnacji betonu. Domieszka ta zmniejsza parowanie wody z betonu i poprawia właściwości samozagęszczającego się betonu. Pokazano wpływ tej domieszki na właściwości betonów różnych klas. Porównano tę technologię z pielęgnacją tradycyjną i z brakiem pielęgnacji betonu.
EN
Continuous evaporation of moisture takes place from exposed concrete surfaces due to the potential difference between the vapour and liquid phases. This will reduce the initial water cement ratio resulting in incomplete hydration of cement and thus lowering the quality of concrete. Hence, curing is considered as one of the basic necessities to achieve good performance concrete. Self-curing concrete is one of the special concretes which mitigates insufficient curing due to a variety of reasons including human negligence, scarcity of water, inaccessibility or bad quality of water available for curing. In the present work, polyethylene glycol of different molecular weights are used as self-curing chemicals in self compacting concretes in optimum dosages during the mixing stage. This has ensured reduction in the evaporation of water and enhanced the performance of SCC. This study has clearly brought out the influence of PEG's in different grades of concrete. A comparison was made with conventional curing and concrete without curing.
10
Porównanie wybranych sposobów kodowania na potrzeby transmisji URC
Sybis M., Langowski A., Wesołowski K., Lenarska K.
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
|
2016
|
nr 6
605--608, CD
PL
W artykule przedstawiono porównanie jako ści dekodowania, jaka można uzyskać dla trzech typów kodów zastosowanych w systemach o wysokiej niezawodno sci (URC). W artykule przebadano działanie kodów PEG LDPC i kodów kaskadowych (CC-RS), których wyniki nastepnie porównano z wynikami dla turbo kodów. skane wyniki pokazały, że zastosowanie algorytmu PEG LDPC pozwoliło na osiagniecie lepszej jakości dekodowania w porównaniu do popularnych turbo kodów.
EN
The article presents a comparison of the decod ing performance of the turbo code with two competing coding schemes that could be also considered as transmis sion schemes for the URL transmission. Obtained results have proven that application of PEG-LDPC allows to achieve a better decoding performance compared to the commonly used turbo codes.
11
Content available Polyoxymethylene homo- and copolymer composites stabilized with PEG-grafted hydroxyapatite
Król K., Pielichowska K.
Engineering of Biomaterials
|
2016
|
Vol. 19, no. 138 spec. iss.
84
12
Content available Calcium carbonate mineralization. Part II: effect of poly(ethylene glycol) and block copolymers molecular weight on formation of precipitate
Polowczyk I., Bastrzyk A., Kozlecki T., Grzadka E., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2015
|
Vol. 51, iss. 2
587--600
EN
In this study the role of PEG and PEO-PPO-PEO block copolymers molecular weight in precipitation of calcium carbonate was examined. The CaCO3 particles were characterized by FTIR spectroscopy, X-ray, SEM and particle size distribution analysis. In absence and presence of modifiers, mixing of the reagents led to the formation of calcite crystals. The calcium carbonate obtained with poly(ethylene glycol) and block copolymers was characterized by smaller diameter in comparison with the one without modifiers. It was observed that using compounds with different molecular weights has no obvious effect on the form and properties of precipitated calcium carbonate particles.
13
Content available Calcium carbonate mineralization. Part 1, The effect of poly(ethylene glycol) concentration on the formation of precipitate
Polowczyk I., Bastrzyk A., Kozlecki T., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2013
|
Vol. 49, iss. 2
631--639
EN
In this study, the role of polymer in precipitation has been examined by studying the effect of poly(ethylene glycol) (PEG) on the formation of calcium carbonate particles. The CaCO3 particles were characterized by several techniques, such as FTIR, XRD, SEM, and particle size distribution analysis. In the absence of polymer, the mixing of reagents in an aqueous solution led to the formation of calcite crystals. Introduction of poly(ethylene glycol) molecules reduced the rate of crystallization process, and the effect was concentration dependent. In the presence of 0.05, 0.1, and 0.5 % of PEG, after 5 minutes of precipitation initiation, vaterite microspheres appeared in the system and which were transformed into calcite crystals after 24 hours. The calcium carbonate obtained with PEG was characterized by smaller sized particles in comparison with the ones without polymer.
14
Content available remote Kompozyty poli(oksyetyleno) glikol/nanorurki węglowe otrzymywane metodą rozpuszczalnikową – badania struktury i właściwości termicznych
Pagacz J., Pielichowski K.
Czasopismo Techniczne. Chemia
|
2012
|
R. 109, z. 1-Ch
129--145
PL
W artykule opisano otrzymywanie metodą rozpuszczalnikową układów poli(oksyetyleno) glikolu z nanorurkami węglowymi niemodyfikowanymi oraz funkcjonalizowanymi grupami hydroksylowymi i karboksylowymi. Strukturę otrzymanych materiałów określono przy pomocy spektroskopii FTIR, dyfrakcji promieni rentgenowskich (WAXD) i mikroskopii w świetle spolaryzowanym, a właściwości termiczne badano za pomocą metod analizy termicznej – termograwimetrii (TG) i różnicowej kalorymetrii skaningowej (DSC). Stwierdzono przydatność otrzymanych materiałów jako fazowo-zmiennych rezerwuarów energii.
EN
In this paper preparation of nanocomposites of poly(ethylene glycol) with carbon nanotubes (non-modified and functionalized by hydroxyl and carboxyl groups) by solution blending was described. The structure of materials obtained was studied by FTIR, WAXD and polarized light microscopy methods. Thermal characterization was made using thermogravimetry (TG) and differential scanning calorimetry (DSC). It was proved that PEG/CNT materials can be used for production of phase-change reservoirs of energy.
15
Content available Manufacturing and characterization of resorbable PLGA membranes for biomedical applications
Krok M., Ferreira C., Fernandes S., Kościelniak D., Dobrzyński P., Pamuła E.
Engineering of Biomaterials
|
2011
|
Vol. 14, no. 104
8--13
EN
Porous poly(L-lactide-co-glycolide) (PLGA) membranes were prepared by solvent-casting/porogen leaching method. Poly(ethylene-glycol) (PEG) with two molecular weights was used as a pore former. Mechanical properties of the membranes were analyzed in tensile test. Topography, pore size and surface roughness were characterized by atomic force microscopy on both sites of the membranes. PEG leached out percentage, thickness and wettability were also measured. Osteoblast-like cells were cultured on the membranes for 24 h and 6 days, and morphology, distribution and number of adhered cells as well as secretion of proteins and nitric oxide were measured. The results show that PEG molecular weight affected size and distribution of pores on both surfaces of the membranes. It resulted also in different mechanical characteristics of the membranes. In vitro experiments show that the membranes support adhesion and growth of osteoblast-like cells suggesting their usefulness for guided tissue regeneration (GTR).
16
Multiblock copolymers of e-caprolactone, poly(ethylene glycol), and lactic acid, with shape memory effect
Zawisza-Wasylków M., Ukielski R., Sobecki P. P.
Inżynieria Materiałowa
|
2007
|
Vol. 28, nr 3-4
824-828
EN
Shape memory polymers (SMP), when deformed, have the ability to recover their initial shape on exposure to an external stimulus. The purpose of this work was to obtain biodegradable polymers with transition temperature close to the human body temperature. The copolymers consisting of crystalline switching segments and hard segments responsible for the permanent shape were designed and prepared. A series of multiblock copolymers comprising poly(e-caprolactone) (PCL) and poly(ethylene glycol) (PEG) as soft segments and poly(lactic acid) (PLAc) as hard segments were synthesized. The chemical structure of synthesized prepolymers and copolymers was investigated by ' H-NMR spectroscopy. The DSC studies of soft blocks indicated the relation of the melting temperature copolymers to their molecular weights and contents of PEG units in polymers. Measurements of water absorption showed its relation to a percentage content and the chain length of PEG in the soft segments. The polymers with melting temperature (transition temperature) close to 40°C were obtained.
PL
Polimery z pamięcią kształtu (SMP) mają zdolność powracania, w odpowiednich warunkach, do nadanego im wcześniej kształtu pod wpływem określonego bodźca fizycznego bądź chemicznego. Celem niniejszej pracy było uzyskanie biodegradowalnych polimerów z temperaturą przejścia bliską do temperatury ludzkiego ciała. Zaprojektowano i otrzymano kopolimery składające się z krystalizujących bloków giętkich, odpowiedzialnych za pamięć kształtu, oraz sztywnych determinujących kształt trwały materiału. Otrzymano multiblokowe kopolimery, których bloki giętkie zbudowane są z triblokowego kopolimeru e-kaprolaktonu i poli(glikolu etylenowego) (PEG), natomiast bloki sztywne stanowią fragmenty poli(kwasu mlekowego) (PLAc). Strukturę chemiczną zsyntezowanych prepolimerów i kopolimerów określono za pomocą jądrowego rezonansu magnetycznego 'H-NMR. Analiza DSC bloków giętkich wykazała zależność temperatury topnienia od ciężaru cząsteczkowego PEG oraz jego udziału w polimerze. Na absorpcję wody polimerów znaczny wpływ wywiera udział wagowy PEG i jego ciężar cząsteczkowy. Uzyskano polimery z temperaturą topnienia (temperatura przejścia) bliską temperatury ludzkiego ciała, tj. ok. 40°C.
17
Content available remote Zastosowanie różnicowej kalorymetrii skaningowej z modulacją temperatury (MT-DSC) do badania przejśc fazowych blend poli(glikolu etylenowego) (PEG)
Pielichowski K., Flejtuch K.
Przemysł Chemiczny
|
2003
|
T. 82, nr 8-9
942-944
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