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Journal articles on the topic 'PH (potential of hydrogen)'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Wu, Qingrong, Yu Fu, Wanying Yang, and Shouxin Liu. "A Temperature/pH Double-Responsive and Physical Double-Crosslinked Hydrogel Based on PLA and Histidine." Gels 8, no. 9 (2022): 570. http://dx.doi.org/10.3390/gels8090570.

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Hydrogel is a good drug carrier, widely used in the sustained-release aspect of tumor drugs, which can achieve the continuous release of drugs to the tumor sites. In this study, diethylene glycol monomethyl ether methacrylate (MEO2MA) and poly (ethylene glycol) methyl ether methacrylate (OEGMA) are temperature-sensitive monomers. N-Methacryloyl-L-Histidine (Mist) is pH sensitive monomer and ligand for metal coordination bond. The temperature-sensitive monomers and pH sensitive monomer with stereocomplex of modified polylactic acid (HEMA-PLLA30/PDLA30) were mixed, under 2,2’-azobis (2-methylpro

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2

Sudewa, Banu, and Febrian Hadiatna. "EVALUASI SENSOR FIT0348 SEBAGAI ALAT UKUR POTENTIAL OF HYDROGEN (PH) LARUTAN." Jurnal Elektro dan Telekomunikasi Terapan 4, no. 2 (2018): 570. http://dx.doi.org/10.25124/jett.v4i2.1129.

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Pada penelitian ini dilakukan Evaluasi pada sensor pH FIT0348 sebagai alat ukur pH berbasis mikrokontroler. Evaluasi ini dilakukan untuk mengetahui seberapa besar tingkat akurasi, ketidakpastian dalam kalibrasi dan kenaikan pH air. Perancangan dan Impelementasi prototype sistem pemantauan pH terdiri dari sensor pH FIT0348, mikrokontroler ATmega16A, rangkaian amplifier, personal computer. Pengujian dilakukan dengan cara melakukan kalibrasi, dan pemantauan derajat keasaman larutan selama 20 jam dengan interval pengambilan data 1 jam. Larutan yang menjadi objek pengujian adalah air mineral sebany

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3

Elvitigala, Kelum Chamara Manoj Lakmal, Wildan Mubarok, and Shinji Sakai. "Hydrogels with Ultrasound-Treated Hyaluronic Acid Regulate CD44-Mediated Angiogenic Potential of Human Vascular Endothelial Cells In Vitro." Biomolecules 14, no. 5 (2024): 604. http://dx.doi.org/10.3390/biom14050604.

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The development of hydrogels that allow vascular endothelial cells to form capillary-like networks is critical for advancing tissue engineering and drug discovery. In this study, we developed hydrogels composed of phenolated hyaluronic acid (HA-Ph) with an average molecular weight of 490–159 kDa via sonication in an aqueous solution. These hydrogels were synthesized by the horseradish peroxidase-catalyzed crosslinking of phenol moieties in the presence of hydrogen peroxide and phenolated gelatin. The sonication-degraded HA-Ph (198 kDa) significantly enhanced the migration ability of human umbi

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Dubashynskaya, Natallia V., Valentina A. Petrova, Dmitry P. Romanov, and Yury A. Skorik. "pH-Sensitive Drug Delivery System Based on Chitin Nanowhiskers–Sodium Alginate Polyelectrolyte Complex." Materials 15, no. 17 (2022): 5860. http://dx.doi.org/10.3390/ma15175860.

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Polyelectrolyte complexes (PECs), based on partially deacetylated chitin nanowhiskers (CNWs) and anionic polysaccharides, are characterized by their variability of properties (particle size, ζ-potential, and pH-sensitivity) depending on the preparation conditions, thereby allowing the development of polymeric nanoplatforms with a sustained release profile for active pharmaceutical substances. This study is focused on the development of hydrogels based on PECs of CNWs and sodium alginate (ALG) for potential vaginal administration that provide controlled pH-dependent antibiotic release in an aci

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5

Karidio Daouda I., Oumoul-Kairou, David Tsuanyo, Adjoumani Kouakou, and Benjamin Yao Kouassi. "Impact of hydrogen potential on anaerobic digestion of organic waste." E3S Web of Conferences 354 (2022): 03005. http://dx.doi.org/10.1051/e3sconf/202235403005.

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The world’s waste deposit has become more important due to the growth of the world economy and demography. Biomethanation is method of choice for the treatment of fermentable fractions of municipal waste. However, low methane yield due to operational issues and process instability prevent this technology from being widely applied. It shows that biogas is made up of approximately 50-70% CH4; 30-50% CO2 from traces of other gases. Solutions for improving CH4 production include controlling anaerobic digestion factors. These factors are essentially: the methanogenic potential, the carbon/nitrogen

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6

Sun, Ling, Shuo Sun, Yufen Li, et al. "Potential biomarkers predicting risk of pulmonary hypertension in congenital heart disease: the role of homocysteine and hydrogen sulfide." Chinese Medical Journal 127, no. 5 (2014): 893–99. http://dx.doi.org/10.3760/cma.j.issn.0366-6999.20132694.

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Background Pulmonary hypertension (PH) is a common complication of congenital heart disease (CHD). Although risk stratification is vital for prognosis and therapeutic guidance, the need for understanding the role of novel biomarkers cannot be overlooked. The aim of the present study was to investigate the changes of homocysteine and hydrogen sulfide levels and find potential biomarkers for early detection and treatment. Methods Between September 2012 and April 2013, we prospectively collected data on 158 pediatric patients with left to right shunt CHD at our institution. Standard right heart c

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7

Shrimali, Vinay Shrimali. "REVIEW RESEARCH PAPER: USE OF HYDROGEN FOR PREPARING HIGH PH ALKALINE WATER AND INNOVATIVE TECHNOLOGIES FOR INCREASING WATER PH." Revista o Universo Observável 1, no. 6 (2024): 2–4. https://doi.org/10.5281/zenodo.14010453.

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<em>Hydrogen, as an active element in water treatment, plays a significant role in the preparation of high pH alkaline water. The development of innovative technologies, such as electrolytic methods and hydrogen-rich water systems, provides methods for increasing water pH effectively. This research paper explores the scientific principles behind using hydrogen to create alkaline water, compares traditional and modern technologies, and highlights the potential benefits and applications of alkaline water, including health and industrial uses.</em>

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8

Viswanathan, V., and Nage Deepashri. "Influence of pH on Hydrogen Absorption in Duplex Stainless Steel." Advanced Materials Research 794 (September 2013): 592–97. http://dx.doi.org/10.4028/www.scientific.net/amr.794.592.

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With rising demands, oil and gas exploration of high-pressure high-temperature (HPHT) wells are increasing worldwide. Due to aggressiveness of HPHT environments, piping and equipments are constructed with high-strength corrosion resistant alloys (CRAs). Duplex stainless steel is one of the candidate alloys that offer high strength along with corrosion resistance. It possesses the advantages of both austenitic and ferritic stainless steels and hence, the name duplex or dual phase stainless steel. In order to control corrosion, cathodic protection is commonly being employed on the structures and

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9

Zagklis, Dimitris, Marina Papadionysiou, Konstantina Tsigkou, Panagiota Tsafrakidou, Constantina Zafiri, and Michael Kornaros. "Effect of pH on the Economic Potential of Dark Fermentation Products from Used Disposable Nappies and Expired Food Products." Applied Sciences 11, no. 9 (2021): 4099. http://dx.doi.org/10.3390/app11094099.

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Used disposable nappies constitute a waste stream that has no established treatment method. The purpose of this study was the assessment of the dark fermentation of used disposable nappies and expired food products under different pH values. The biodegradable part of the used disposable nappies was recovered and co-fermented with expired food products originating from supermarkets. The recoverable economic potential of the process was examined for different volatile fatty acids exploitation schemes and process pH values. The process pH strongly affected the products, with optimum hydrogen prod

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10

Soehardjono, Agoes, Faris Rizal Andardi, Wisnumurti, and Ari Wibowo. "Effect of potential of Hydrogen (pH) on compressive strength with variations in soaking concrete." Roads and Bridges – Drogi i Mosty 24, no. 2 (2025): 223–30. https://doi.org/10.7409/rabdim.025.011.

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The pH level plays a crucial role in the properties of concrete, including compressive strength, durability, and resistance to corrosion of reinforcement. The influence of pH still requires in-depth investigation to determine its effect on concrete strength under varying pH levels and immersion durations in seawater. The compressive strength test was carried out on a total of 540 concrete samples. The test specimens used in this study were cylindrical in shape, with a height of 30 cm and a diameter of 15 cm. The target compressive strengths in this research were 25 MPa, 35 MPa, and 45 MPa. The

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11

Jegdic, Bore, Dragutin Drazic, and Jovan Popic. "Corrosion potential of 304 stainless steel in sulfuric acid." Journal of the Serbian Chemical Society 71, no. 5 (2006): 543–51. http://dx.doi.org/10.2298/jsc0605543j.

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The potentiodynamic study of the electrochemical behavior of austenitic 304 stainless steel in deaerated aqueous sulfuric acid of pH 1 revealed that the steel achieved a stable corrosion potential of ca. - 0.350 V (SCE) independent of whether the electrode had previously been cathodically "activated" or anodically passivated. It was also shown that the experimentally observed anodic peak was not the usually obtained anodic passivation peak, as is the case with a number of metal, but an artifact due to the anodic oxidation of hydrogen absorbed during the previously employed cathodic polarizatio

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12

Ng, T. Y., Hua Li, Y. K. Yew, and K. Y. Lam. "Effects of Initial-Fixed Charge Density on pH-Sensitive Hydrogels Subjected to Coupled pH and Electric Field Stimuli: A Meshless Analysis." Journal of Biomechanical Engineering 129, no. 2 (2006): 148–55. http://dx.doi.org/10.1115/1.2472370.

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In this paper, we study the effects of initial fixed-charge density on the response behavior of pH-sensitive hydrogels subjected to coupled stimuli, namely, solution pH and externally applied electric field. This is the first instance in which a coupled stimuli numerical analysis has been carried out for these polymer gels, which are used as active sensing/actuating elements in advanced biomicroelectromechanical systems devices. In this work, a chemo-electro-mechanical formulation, termed the multi-effect-coupling pH-stimulus (MECpH) model, is first presented. This mathematical model takes int

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13

Dedi Tampubolon, Yose Rizal, and Saiful Anwar. "Eksperimental Biochar Ampas Tebu Pada Performa Potential Hydrogen Dan Total Dissolved Solid." ENOTEK : Jurnal Energi dan Inovasi Teknologi 2, no. 02 (2023): 43–48. http://dx.doi.org/10.30606/enotek.v2i02.1585.

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Air adalah kebutuhan pokok bagi kehidupan manusia, binatang dan tumbuhan yang memiliki ciri yaitu tidak mempunyai rasa, bau dan warna yang terdiri dari hidrogen dan oksigen dengan rumus kimia H2O. Hasil pengukuran pH dan TDS di salah satu sumur bor di Kampung Kurma memiliki nilai pH 5.5 mg/l dan TDS 2770 mg/l dianggap tidak masuk dalam batas standard air layak konsumsi. Tujuan penelitian ini untuk mengetahui biochar ampas tebu dengan variasi tebal lapisan yang berbeda dan tambahan bahan lainnya pada performa pH dan TDS. Untuk itu penelitian eksperimental perlu dilakukan terlebih dahulu dengan

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14

Gumilar, Andri, Mindriany Syafila, Marisa Handajani, Ilham Anggamulia, and Syarif Hidayat. "Wastewater Processing Technology Opportunities for Palm Oil Mill Effluent as a Raw Material for Renewable Bioenergy." Journal of Engineering and Technological Sciences 54, no. 3 (2022): 220313. http://dx.doi.org/10.5614/j.eng.technol.sci.2022.54.3.13.

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The effect of pH on the formation of hydrogen and ethanol using POME as the substrate has not been widely studied. Indonesia, which is the largest producer of palm oil, has a high potential for the utilization of this liquid waste as a substrate for the formation of hydrogen and ethanol. This study determined the optimum hydrogen and ethanol production conditions by controlling pH. POME was used as substrate in an anaerobic reactor and operated in feed batch mode for 72 hours. Mixed culture anaerobic bacteria as biomass were used in the reactor. The pH of the reactor was adjusted to 4.5, 5.5,

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15

Liu, Chang Qing, Yu Fang Yu, Hong Lin, and You Cai Zhao. "Effects of Initial pH on Bio-Hydrogen Production from Alkaline Pretreated Municipal Sludge." Advanced Materials Research 878 (January 2014): 689–98. http://dx.doi.org/10.4028/www.scientific.net/amr.878.689.

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Great attention has been paid to the increasing amount of municipal sludge generated from wastewater treatment plants due to its potential risks to the surrounding environment. The municipal sludge, which mainly composed of polysaccharides, proteins as well as abundant groups of microorganisms, has been proved to be a promising biological material for hydrogen production by anaerobic fermentation. The tests systematically investigated the effects of initial pH on bio-hydrogen production from alkaline pretreated municipal sludge. The results showed that both hydrogenogen and methanogen were inh

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16

Tanu, Mittal, and Sinh Sikha. "Potential Application of Hydrogel - A Literature Survey." International Journal for Indian Science and Research Volume-1, Issue-1 (2022): 14. https://doi.org/10.5281/zenodo.6787559.

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Hydrogels are cross-linked polymeric networks, which have the ability to hold water <em>within </em>the space available among the polymeric chains. The hydrogels have been used extensively in various biomedical applications, <em>viz.</em> drug delivery, cell carriers and/or entrapment, wound management and tissue engineering. Hydrogels are swellable polymeric materials, have been widely as a carrier of drug delivery y tern. These biomaterials have gained attention owing to their peculiar characteristics like swelling in aqueoumedm, pH and temperature sensitivity or sensitivity towards oth

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17

DeCoursey, T. E., and V. V. Cherny. "Potential, pH, and arachidonate gate hydrogen ion currents in human neutrophils." Biophysical Journal 65, no. 4 (1993): 1590–98. http://dx.doi.org/10.1016/s0006-3495(93)81198-6.

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18

Johnson, D. Barrie, E. Jameson, O. F. Rowe, K. Wakeman, and Kevin B. Hallberg. "Sulfidogenesis at Low pH by Acidophilic Bacteria and its Potential for the Selective Recovery of Transition Metals from Mine Waters." Advanced Materials Research 71-73 (May 2009): 693–96. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.693.

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Biosulfidogenesis (the generation of hydrogen sulfide by microorganisms) in acidic liquors was investigated using two metabolically-distinct bacteria. One was a novel acidophilic sulfate-reducing bacterium (isolate CL4) that grew at pH 3.0 and above using glycerol as electron donor, and the other was the type strain of Acidithiobacillus ferrooxidans which was grown at pH 2.5 using hydrogen (derived from dissolution of metallic iron) as electron donor and elemental sulfur as electron acceptor. Both bacteria were grown in pH-controlled bioreactors. Isolate CL4 mediated the selective precipitatio

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U., D. Abubakar, and T. Barminas J. "Evaluation of Bombax costatum Calyx Hydrogel as a Potential Insulin Delivery System." British Journal of Applied Science & Technology 20, no. 6 (2017): 1–9. https://doi.org/10.9734/BJAST/2017/32935.

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Hydrogel are a class of polymer materials that can absorb large amount of water without dissolving. The property of hydrogels to absorb water arises from hydrophilic functional groups attached to the polymeric backbone, while resistance to dissolution is due to physical or chemical crosslinking of the hydrophilic polymer chains. They are capable of responding to physical and chemical stimuli such as temperature pressure, pH, ionic strength, etc. In this study<em> Bombax costatum</em> calyx hydrogel was prepared to explore its potential in drug delivery. The study involves the encapsulation of

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20

Farooq, A., K. M. Deen, I. H. Khan, et al. "Peculiar Corrosion Behavior of Type 316L SS in Simulated Cooling Water at Various pH Values." Materials Performance 53, no. 10 (2014): 44–47. https://doi.org/10.5006/mp2014_53_10-44.

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The effect of pH on the corrosion be-havior of Type 316L stainless steel (SS) (UNS S31603) in simulated cooling water was studied using corrosion potential and potentiodynamic polarization techniques. The fundamental result is that corrosion is very effectively controlled within a relatively narrow range of neutral to near-neutral pH values with increased corrosion rates outside that range in either direction. The negative (active) open circuit potential at pH values lower and higher than neutral (6 ≤ pH ≤ 8) was due to dissolution of the passive film by a hydrogen reduction reaction and oxida

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21

Kumar Soni, Rakesh, Shailesh M Kewatkar, Vidhi Jain, and Manmeet Singh Saluja. "A Review of Hydrogels, with its Properties and Applications in Medicine." Journal of Biomedical and Pharmaceutical Research 12, no. 2 (2023): 20–33. http://dx.doi.org/10.32553/jbpr.v12i2.970.

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A hydrogel is an insoluble in water three-dimensional polymer network that has the potential to absorb bodily fluids in a biological setting. Hydrogels may also be used in medical applications. Chemical crosslinking mechanisms such as optical polymerization, enzymatic reactions, and physical crosslinking mechanisms such as temperature- and pH-dependent processes, as well as ionic crosslinking, are all responsible for the formation of a network of polymers of this kind. Both physical and chemical hydrogels may be generated by the application of weak secondary forces, but chemical hydrogels can

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22

Oka, Kouki, Orie Tsujimura, Takeo Suga, Hiroyuki Nishide, and Bjorn Winther-Jensen. "Light-assisted electrochemical water-splitting at very low bias voltage using metal-free polythiophene as photocathode at high pH in a full-cell setup." Energy & Environmental Science 11, no. 5 (2018): 1335–42. http://dx.doi.org/10.1039/c7ee03669h.

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23

Yang, Wu, Guang Fu Li, Hao Guo, Jian Jiang Zhou, Chun Bo Huang, and Jiasheng Bai. "Effects of Environmental Factors on Stress Corrosion Cracking of Pipeline Steels." Key Engineering Materials 297-300 (November 2005): 939–44. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.939.

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Effects of some environmental factors on stress corrosion cracking (SCC) of pipeline steel X-70 both in near-neutral pH environments, including NS4 solution and several solutions containing main types of soil in the eastern part of China, and in high pH solution were studied by means of electrochemical measurement and slow strain rate testing (SSRT). The anodic polarization curves showed different features in near-neutral pH and high pH solutions in terms of active-passive transition behavior. In near-neutral pH solutions, the cracking mode was transgranular with the feature of quasi-cleavage,

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24

Osuegba, O.S., V. O. Adeleke-Ajagbe, and B. O. Atolaiye. "pH Dependence of Cyanogen Potentials of Local Wines (Buruku and Pito) Using Cyanomethemoglobin Complex." RA JOURNAL OF APPLIED RESEARCH 08, no. 12 (2022): 868–73. https://doi.org/10.5281/zenodo.7426237.

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The cyanogen potentials of local wines (burukutu, pito,) and the effect of pH (5.6-9.0) on the samples was determined using cyanomethemoglobin complex method. A total of 108 test samples were analyzed and the hydrogen cyanide content was found to vary considerably from 0.0313±0.0052 mg/L to 0.2444±0.0010 mg/L. pito was found to have the highest cyanogen potential with mean concentration of 0.2444±0.0010 mg/L at pH of 8.4 and burukutu found to have the lowest cyanogen potential with mean concentration of 0.0313±0.0052 mg/L at pH of 8.2. The highest mean concentration

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25

Qin, Zhi, and Dan Li. "Hydrogen-Production of Hydrogen-Producing Bacteria at Different Temperatures in Batch Culture." Advanced Materials Research 512-515 (May 2012): 1400–1403. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.1400.

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Energy crisis is paid more attention to its significance around the world. Hydrogen is considered the most potential alternate energy source due to the character of non-pollution and zero emissions. This paper researched the variation of hydrogen-producing rate, pH value and the proportion under five temperatures of 25°C, 30°C, 35°C, 40°C, 45°C through batch culture and the reasons of these appearance. And anaerobic hydrogen-producing bacteria’s isolation and enrichment culture was accomplished by Hungater’s anaerobic technique. The time of logarithmic phase was 24h, 16h, 12h, 20h and 28h and

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Niedrach, Leonard W., and William H. Stoddard. "Monitoring pH and Corrosion Potentials in High Temperature Aqueous Environments." Corrosion 41, no. 1 (1985): 45–51. http://dx.doi.org/10.5006/1.3581968.

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Abstract A zirconia membrane electrode that responds to pH can serve admirably as a pH sensor in high temperature aqueous systems. Alternatively, under conditions of known, stable pH, the sensor may be used as a reference electrode for monitoring corrosion and redox potentials. Data are presented to illustrate the thermodynamic reliability and stability of such a sensor at elevated temperatures. An example of corrosion potential monitoring, including correlations with related ambient temperature measurements of pH, oxygen and hydrogen concentrations, and water resistivity, is given.

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GUMEL, AHMAD MOHAMMED. "BIOSYNTHESIS OF pH RESPONSIVE SHAPE MEMORY HYDROGEL AND ITS BIOMEDICAL POTENTIAL." JOURNAL OF ADVANCES IN BIOTECHNOLOGY 6, no. 3 (2017): 946–52. http://dx.doi.org/10.24297/jbt.v6i3.6556.

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Multifunctional hydrogels combining the capabilities of cellular pH responsiveness and shape memory, are highly promising for the realization of smart membrane filters, controlled drug released devices, and functional tissue-engineering scaffolds. Free radical biocatalytic polymerization catalyzed by immobilized Candida antarctica lipase B was used to fabricate the pH-responsive and shape memory hydrogel using medium-chain-length poly-3-hydroxyalkanoates-co-polyethylene glycol methacrylate (PHA-PEGMA) as macromer. The accelerative wound healing potential of the biosynthesized smart PHA based h

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28

Zheng, Jie, Wenchao Sheng, Zhongbin Zhuang, Bingjun Xu, and Yushan Yan. "Universal dependence of hydrogen oxidation and evolution reaction activity of platinum-group metals on pH and hydrogen binding energy." Science Advances 2, no. 3 (2016): e1501602. http://dx.doi.org/10.1126/sciadv.1501602.

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Understanding how pH affects the activity of hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) is key to developing active, stable, and affordable HOR/HER catalysts for hydroxide exchange membrane fuel cells and electrolyzers. A common linear correlation between hydrogen binding energy (HBE) and pH is observed for four supported platinum-group metal catalysts (Pt/C, Ir/C, Pd/C, and Rh/C) over a broad pH range (0 to 13), suggesting that the pH dependence of HBE is metal-independent. A universal correlation between exchange current density and HBE is also observed on the fo

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Herrero, Enrique, Juan Feliu, and Valentin Briega. "(Keynote) Effect of the Surface Charge on the Oxygen and Hydrogen Peroxide Reduction Reactions." ECS Meeting Abstracts MA2022-01, no. 49 (2022): 2060. http://dx.doi.org/10.1149/ma2022-01492060mtgabs.

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The electrochemical behavior of hydrogen peroxide, which is a possible intermediate of the oxygen reduction reaction (ORR), has been investigated on platinum single crystal electrodes containing terraces with (111) symmetry separated by monoatomic steps with either (110) or (100) symmetry in different pH solutions [1]. On these electrodes, a decrease, in absolute value, of the reduction current at low potentials is observed. The potential at which the decrease is observed, can be correlated with the potential of maximum entropy (pme) of the double layer formation on the terraces. In addition,

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Loučka, Tomáš. "The Potential-pH Diagrams Depicting the Hydrogen Chemisorption in the Pt-H2O, Ir-H2O, and Rh-H2O Systems at 25 °C." Collection of Czechoslovak Chemical Communications 60, no. 4 (1995): 553–58. http://dx.doi.org/10.1135/cccc19950553.

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Thermodynamic data for the chemisorption of hydrogen on the Pt, Ir, and Rh electrodes were evaluated from data in the literature. On the basis of these data, the potential-pH diagrams were calculated for the Pt-H2O, Ir-H2O, and Rh-H2O systems describing the hydrogen chemisorption. For the hydrogen chemisorption, the surface was considered to be uniformly inhomogeneous.

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Protopopoff, Elie, and Philippe Marcus. "Potential–pH diagrams for hydroxyl and hydrogen adsorbed on a copper surface." Electrochimica Acta 51, no. 3 (2005): 408–17. http://dx.doi.org/10.1016/j.electacta.2005.04.036.

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Zhu, Lei Lei, Bing Wang, Shuang Gao, et al. "Effect of pH, ORP and Influent COD on Hydrogen Content in Fermentative Hydrogen Production." Advanced Materials Research 156-157 (October 2010): 877–81. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.877.

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Fermentative hydrogen production was carried out using a continuous flow stirred tank reactor (CSTR) for the investigation of the hydrogen content in the biogas. Molasses was used as the substrate; hydraulic retention time (HRT) was 6 h; the temperature was in the range of 35±1 .It was showed that hydrogen content increased from 38% to 59% when pH decreased from 5 to 4.6 with oxidation-reduction potential (ORP) increased from -420 mV to -380 mV. The hydrogen content dropped from 50% to 30% as influent COD was improved from4000 mg/L to 6000 mg/L. Hydrogen content increased to 35% when influent

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33

Rodrigues Sousa, Heldeney, Idglan Sá Lima, Lucas Matheus Lima Neris, et al. "Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients." Molecules 26, no. 9 (2021): 2680. http://dx.doi.org/10.3390/molecules26092680.

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Agricultural production is influenced by the water content in the soil and availability of fertilizers. Thus, superabsorbent hydrogels, based on polyacrylamide, natural cashew tree gum (CG) and potassium hydrogen phosphate (PHP), as fertilizer and water releaser were developed. The structure, morphology, thermal stability and chemical composition of samples of polyacrylamide and cashew tree gum hydrogels with the presence of fertilizer (HCGP) and without fertilizer (HCG) were investigated, using X-ray diffractometry (XRD), Fourier Transformed Infrared Spectroscopy (FTIR), Scanning Electron Mic

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34

Crepaldi, Renata Maria Coelho, Cíntia Monteiro, Maria Angélica Sorgini Peterlini, and Mavilde da Luz Gonçalves Pedreira. "Hydrogen-Ion Potential of Antibiotics According to the Environment Factors Temperature and Luminosity." Revista Latino-Americana de Enfermagem 18, no. 2 (2010): 278–86. http://dx.doi.org/10.1590/s0104-11692010000200020.

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The objective of this experimental study was to measure the pH of antibiotics administered by intravenous infusion - ceftriaxone sodium, vancomycin hydrochloride, metrodinazole, penicillin G potassium and amikacin sulfate - after reconstitution with sterile water and dilution with NaCl 0.9% or dextrose 5% in water, according to temperature and luminosity of the environment. The results showed that variation in the drugs' pH was less than 1.0 value and that some antibiotics remained acidic after dilution and maintained this chemical profile in all situations studied, suggesting that the studied

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Imai, Tsuyoshi. "Thermotolerance and Hydrogen Production Potential of Salt-tolerant Microbial Communities from Salt Fields." Chiang Mai Journal of Science 51, no. 6 (2024): 1–15. http://dx.doi.org/10.12982/cmjs.2024.107.

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T his study investigated the upper mesophilic temperature acclimation of halophilic, hydrogen-producing bacteria from salt fields, focusing on microbial abundance changes during dark fermentation. Genomic techniques, including PCR-denaturing gradient gel electrophoresis (DGGE) and next-generation sequencing (NGS), were used to profile the microbial communities. At 48°C, Halanaerobacter lacunarum showed significant abundance, correlating with increased hydrogen yield, suggesting its role in hydrogen production. While a decrease in H. lacunarum and Halanaerobium fermentans dominance was observed

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Alkorta, Ibon, José Elguero, and Sławomir J. Grabowski. "Pnicogen and hydrogen bonds: complexes between PH3X+ and PH2X systems." Physical Chemistry Chemical Physics 17, no. 5 (2015): 3261–72. http://dx.doi.org/10.1039/c4cp04840g.

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Haruna, Takumi, Daiki Morihashi, and Youhei Hirohata. "Correlation between susceptibility to environment-assisted cracking of super-elastic TiNi alloy and the states and their amount of hydrogen in it." MATEC Web of Conferences 321 (2020): 06002. http://dx.doi.org/10.1051/matecconf/202032106002.

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Susceptibility to environment-assisted cracking (EAC) of super-elastic TiNi alloy has been correlated with the states and their amount of hydrogen in the material. The TiNi alloy specimen was immersed in sulfate solutions at a given pH, and a giving cathodic potential was applied to it for 13 ks to absorb hydrogen into it. The specimen was subjected to X-ray diffraction (XRD) test to detect hydride, and to thermal gas desorption spectroscopy (TDS) test to determine the state and its amount of hydrogen in it. In the case that a potential of -0.5 VAg/AgCl was applied to the specimen in the solut

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Usmanbaha, Nikannapas, Rattana Jariyaboon, Alissara Reungsang, Prawit Kongjan, and Chen-Yeon Chu. "Optimization of Batch Dark Fermentation of Chlorella sp. Using Mixed-Cultures for Simultaneous Hydrogen and Butyric Acid Production." Energies 12, no. 13 (2019): 2529. http://dx.doi.org/10.3390/en12132529.

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This paper reports on the optimum conditions for simultaneous hydrogen and butyric acid production from microalgae (Chlorella sp.) using enriched anaerobic mixed cultures as inoculum. The fermentation was objectively carried out under acidogenic conditions to achieve butyric acid for further ABE fermentation in solventogenesis stage. The main effects of initial pH (5 and 7), temperature (35 °C and 55 °C), and substrate concentration (40, 60, 80, and 100 g-VS/L) for hydrogen and butyric acid production were evaluated by using batch fermentation experiment. The major effects on hydrogen and buty

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Li, Zili, Chao Yang, Gan Cui, Shouxin Zhang, and Chengbin Zhang. "Effect of pH and NaCl concentration on the hydrogen evolution reaction of X60 steel." Anti-Corrosion Methods and Materials 66, no. 2 (2019): 203–9. http://dx.doi.org/10.1108/acmm-08-2018-1978.

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Purpose When hydrogen evolution reaction occurs on a metal surface, on the one hand, the generated hydrogen atom may penetrate into the metal that causes the hydrogen embrittlement failure of materials; on the other hand, the hydrogen generation may increase the local pressure in the coating and cause coating blistering. The purpose of this study is to study the effect of NaCl concentration and pH on hydrogen evolution reaction of X60 steel. Design/methodology/approach A cathodic polarization curve 257E-2V vs OCP and EIS was obtained by conventional three-electrode system in different NaCl con

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Lu, Ching-Chun, and Chiu-Yue Lin. "Bioenergy Production from Sorghum Distillers Grains via Dark Fermentation." BioTech 13, no. 4 (2024): 55. https://doi.org/10.3390/biotech13040055.

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Sorghum distillers grains (SDGs) produced from a sorghum liquor company were used for generating biohydrogen via dark fermentation at pH 4.5–6.5 and 55 °C with a batch test, and the biohydrogen electricity generation potential was evaluated. The experimental results show that pH markedly affects hydrogen concentration, hydrogen production rate (HPR) and hydrogen yield (HY), in that high acidic pH values result in high values. The HPR and HY ranged from 0.76 to 3.2 L/L-d and 21.4 to 62.3 mL/g chemical oxygen demand, respectively. These hydrogen production values were used to evaluate bioelectri

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MAHAUT-SMTTH, M. P. "Separation of Hydrogen Ion Currents in Intact Molluscan Neurones." Journal of Experimental Biology 145, no. 1 (1989): 439–54. http://dx.doi.org/10.1242/jeb.145.1.439.

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The amplitude and rate of activation of the voltage-dependent H+ pathway in intact Helix neurones were investigated using standard two-electrode voltageclamp techniques. Na+ and K+ currents were inhibited by a Na+-free, tetraethyl-ammonium (TEA2+) (low-Cl−) saline and by use of Cs+-filled electrodes. Ca+ currents were abolished by holding the membrane at −15 to −10 mV. Depolarizing voltage pulses from these low potentials activated outward currents whose tail current reversal potential shifted with changes in intracellular and extracellular pH, but not with changes in external KC1; thus these

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Lee, Siaw Foon, Jose Fullea García, Seong Shan Yap, and David Hui. "Pitting corrosion induced on high-strength high carbon steel wire in high alkaline deaerated chloride electrolyte." Nanotechnology Reviews 11, no. 1 (2022): 973–86. http://dx.doi.org/10.1515/ntrev-2022-0060.

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Abstract Electrochemical response causing pitting corrosion of high-strength high carbon steel wire in deaerated electrolyte at pH 13.4 due to different chloride ion (Cl−) concentrations was investigated using open circuit potential, cyclic potentiodynamic polarization, and anodic potentiostatic application (APA) within the passive zone. Results showed that the higher the Cl− concentration, the more negative the corrosion potential becomes. In the high alkaline pH 13.4 without the presence of free oxygen gas the Cl− concentration could reach up to 1 M not showing pitting potential. An inverse

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Vigata, Margaux, Christoph Meinert, Nathalie Bock, Bronwin L. Dargaville, and Dietmar W. Hutmacher. "Deciphering the Molecular Mechanism of Water Interaction with Gelatin Methacryloyl Hydrogels: Role of Ionic Strength, pH, Drug Loading and Hydrogel Network Characteristics." Biomedicines 9, no. 5 (2021): 574. http://dx.doi.org/10.3390/biomedicines9050574.

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Water plays a primary role in the functionality of biomedical polymers such as hydrogels. The state of water, defined as bound, intermediate, or free, and its molecular organization within hydrogels is an important factor governing biocompatibility and hemocompatibility. Here, we present a systematic study of water states in gelatin methacryloyl (GelMA) hydrogels designed for drug delivery and tissue engineering applications. We demonstrate that increasing ionic strength of the swelling media correlated with the proportion of non-freezable bound water. We attribute this to the capability of io

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Surpăţeanu, Mioara, and Carmen Zaharia. "Advanced oxidation processes for decolorization of aqueous solution containing acid red G azo dye." Open Chemistry 2, no. 4 (2004): 573–88. http://dx.doi.org/10.2478/bf02482722.

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AbstractSome investigations concerning the decolorization of Acid Red G azo dye by photooxidation with hydrogen peroxide were performed. The influences of pH, oxidant concentration, and the presence of Fe2+ or other metal ions (Co2+, Cu2+, Ni2+, Mn2+) as potential catalysts, were investigated. The best results were obtained in the presence of ferrous ions in acid and neutral media. The other ions are not as effective as Fe2+ for dye decolorization. Co2+ and Cu2+ ions have a catalytic action, at low concentration, within a wide range of pH. Ni2+ and Mn2+ ions have no catalytic effect in photoox

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Liang, Yuan Yuan, Tong Chen, Yu Qin Cui, Rui Qiong Tian, Tong Sheng Qi, and Qing Shang. "Synthesis and Performance of pH-Sensitive Hydrogel Microspheres and In Vitro Evaluation as Potential Drug Carriers." Advanced Materials Research 936 (June 2014): 751–56. http://dx.doi.org/10.4028/www.scientific.net/amr.936.751.

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To accelerate the response rate of smart hydrogels to the environmental conditions, a novel pH-sensitive hydrogel microsphere with the controlled shapes and sizes were developed. Such monodispersed microspheres were synthesizedviafree radical polymerization under the protection of a multilayer stability system. The pH-responsibility of hydrogel microspheres was tested with the hydrogel bulk as a control.In vitrorelease studies were conducted in the simulated gastric fluid and intestinal juice with bovine serum albumin (BSA) as a model drug. The large specific surface areas endowed hydrogel mic

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Sun, Yan, Chaoshu Tang, Hongfang Jin, and Junbao Du. "Implications of Hydrogen Sulfide in Development of Pulmonary Hypertension." Biomolecules 12, no. 6 (2022): 772. http://dx.doi.org/10.3390/biom12060772.

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The pathological mechanisms underlying pulmonary hypertension (PH), as well as its treatment strategy, are crucial issues in this field. This review aimed to summarize the pathological mechanisms by which the hydrogen sulfide (H2S) pathway contributes to PH development and its future implications. The data in this review were obtained from Medline and PubMed sources up to 2022 using the search terms "hydrogen sulfide" and "pulmonary hypertension". In the review, we discussed the significance of endogenous H2S pathway alteration in PH development and showed the advance of the role of H2S as the

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Cherny, V. V., V. S. Markin, and T. E. DeCoursey. "The voltage-activated hydrogen ion conductance in rat alveolar epithelial cells is determined by the pH gradient." Journal of General Physiology 105, no. 6 (1995): 861–96. http://dx.doi.org/10.1085/jgp.105.6.861.

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Voltage-activated H+ currents were studied in rat alveolar epithelial cells using tight-seal whole-cell voltage clamp recording and highly buffered, EGTA-containing solutions. Under these conditions, the tail current reversal potential, Vrev, was close to the Nernst potential, EH, varying 52 mV/U pH over four delta pH units (delta pH = pHo - pHi). This result indicates that H+ channels are extremely selective, PH/PTMA &gt; 10(7), and that both internal and external pH, pHi, and pHo, were well controlled. The H+ current amplitude was practically constant at any fixed delta pH, in spite of u

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Miller, FC, BJ Macauley, and ER Harper. "Investigation of various gases, pH and redox potential in mushroom composting Phase I stacks." Australian Journal of Experimental Agriculture 31, no. 3 (1991): 415. http://dx.doi.org/10.1071/ea9910415.

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Investigations of hydrogen sulfide and ammonia concentrations, pH and redox potential were carried out within Phase I mushroom composting stacks in conjunction with measurements of temperature and oxygen concentrations. Gypsum-derived sulfate supported significant microbial activity by sulfate-reducing bacteria in anaerobic core areas. Ammonia concentrations up to 800 ppm were strongly associated with pH values up to 8.8 in aerobic stack areas. Anaerobic areas had pH values of 5-7, with little or no ammonia. Redox potential generally agreed with oxygenation history, with stacks exhibiting redu

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Haruna, Takumi, Yosuke Fujita, Daiki Morihashi, and Youhei Hirohata. "Environment-Assisted Cracking of Super-Elastic TiNi Alloy Depending on Solution pH and Electrochemical Potential." Materials Science Forum 879 (November 2016): 709–13. http://dx.doi.org/10.4028/www.scientific.net/msf.879.709.

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The behavior of environment-assisted cracking (EAC) for super-elastic TiNi alloy was investigated as functions of solution pH and electrochemical potential. The specimen was immersed in sulfate solutions at various pHs, and subjected to a potentiostatic slow strain rate tensile test. As a result, the EAC map for the TiNi alloy as functions of the solution pH and the applied potential was successfully produced, and it was revealed that larger EAC susceptibility was obtained in the region of lower potential and lower pH. The tendency was quite typical for hydrogen embrittlement, but not similar

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Akhtar, Shoaib, Gyan Singh, Surendra P. Singh, Sunil Kumar, and Jitender K. Malik. "Current Scenario of Hydrogel as Drug Delivery System." South Asian Research Journal of Pharmaceutical Sciences 5, no. 02 (2023): 33–37. http://dx.doi.org/10.36346/sarjps.2023.v05i02.002.

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Crosslinked polymer networks known as hydrogels are capable of absorbing large volumes of water liquids. Depending on whether the crosslink connections are chemical or physical, hydrogels can be categorised into two groups. Physical networks feature temporary junctions that result from either polymer chain entanglements or physical interactions like ionic contacts, hydrogen bonds, or hydrophobic interactions, as opposed to chemically crosslinked networks, which have permanent junctions. Swellable polymeric polymers called hydrogels have received a lot of attention as potential drug delivery sy

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