Pub Date : 2023-09-27DOI: 10.1007/s44251-023-00006-5
Chen Yang, Chao-Qun Dang, Wu-Le Zhu, Bing-Feng Ju
Abstract The atomic force microscope (AFM) possesses a unique capability for three-dimensional, high-resolution imaging down to the atomic level. It operates without the needs of additional requirements on sample material and environment, making it highly valuable for surface measurements. Recent advancements have further transformed AFM into a precision machining tool, thanks to its exceptional force measurement capability and positioning precision. High-speed AFM (HS-AFM) is a specialized branch of AFM that inherits the advantages of high spatial resolution of typical AFM but with significantly improved time resolution down to the sub-second level. In this article, instead of delving into extensive research progress enabled by HS-AFM in the broad fields of biology, biophysics, and materials science, we narrow our focus to the specific applications in the domain of ultra-precision surface machining and measurement. To the best of the authors’ knowledge, a comprehensive and systematic summary of the contributions that HS-AFM brings to this field is still lacking. This gap could potentially result in an underappreciation of its revolutionary capabilities. In light of this, we start from an overview of the primary operating modes of AFM, followed by a detailed analysis of the challenges that impose limitations on operational speed. Building upon these insights, we summarize solutions that enable high-speed operation in AFM. Furthermore, we explore a range of applications where HS-AFM has demonstrated its transformative capabilities. These include tip-based lithography (TBL), high-throughput metrology, and in-line inspection of nanofabrication processes. Lastly, this article discusses future research directions in HS-AFM, with a dedicated focus on propelling it beyond the boundaries of the laboratory and facilitating its widespread adoption in real-world applications.
{"title":"High-speed atomic force microscopy in ultra-precision surface machining and measurement: challenges, solutions and opportunities","authors":"Chen Yang, Chao-Qun Dang, Wu-Le Zhu, Bing-Feng Ju","doi":"10.1007/s44251-023-00006-5","DOIUrl":"https://doi.org/10.1007/s44251-023-00006-5","url":null,"abstract":"Abstract The atomic force microscope (AFM) possesses a unique capability for three-dimensional, high-resolution imaging down to the atomic level. It operates without the needs of additional requirements on sample material and environment, making it highly valuable for surface measurements. Recent advancements have further transformed AFM into a precision machining tool, thanks to its exceptional force measurement capability and positioning precision. High-speed AFM (HS-AFM) is a specialized branch of AFM that inherits the advantages of high spatial resolution of typical AFM but with significantly improved time resolution down to the sub-second level. In this article, instead of delving into extensive research progress enabled by HS-AFM in the broad fields of biology, biophysics, and materials science, we narrow our focus to the specific applications in the domain of ultra-precision surface machining and measurement. To the best of the authors’ knowledge, a comprehensive and systematic summary of the contributions that HS-AFM brings to this field is still lacking. This gap could potentially result in an underappreciation of its revolutionary capabilities. In light of this, we start from an overview of the primary operating modes of AFM, followed by a detailed analysis of the challenges that impose limitations on operational speed. Building upon these insights, we summarize solutions that enable high-speed operation in AFM. Furthermore, we explore a range of applications where HS-AFM has demonstrated its transformative capabilities. These include tip-based lithography (TBL), high-throughput metrology, and in-line inspection of nanofabrication processes. Lastly, this article discusses future research directions in HS-AFM, with a dedicated focus on propelling it beyond the boundaries of the laboratory and facilitating its widespread adoption in real-world applications.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract In this paper we have studied adsorption and surface reactions of acetylene and ethylene on Co(0001) in detail by temperature desorption spectrum (TDS), X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). C 2 H 4 adsorption at 130 and 300 K followed by subsequent heating mainly forms C 2 clusters and graphitic carbon, respectively, while C 2 H 4 decomposes at 400 and 500 K to form dominant graphitic carbon and carbon adatoms, respectively. C 2 H 2 molecularly adsorbs at 130 K but exclusively dehydrogenates upon heating. The resulting C 2 H 2 (a) species at low coverages remains stable up to 400 K and then exclusively dehydrogenates into C 2 clusters, while the resulting C 2 H 2 (a) species at high coverages remains stable up to 310 K and then majorly dehydrocyclizates into (C 2 H) n intermediates with ring structures at 340 K which further dehydrogenates into graphitic carbon, and minorly dehydrogenates into C 2 clusters. Exposed at 370 K, C 2 H 2 dehydrocyclizates into (C 2 H) n intermediates with ring structures. These temperature and coverage dependent surface reactions of C 2 H 2 and C 2 H 4 on Co(0001) greatly enrich our fundamental understanding of Co-catalyzed F-T synthesis reaction.
{"title":"Adsorption and surface reactions of C2H2 and C2H4 on Co(0001)","authors":"Lingshun Xu, Zongfang Wu, Haocheng Wang, Junjie Shi, Zichen Li, Weixin Huang","doi":"10.1007/s44251-023-00004-7","DOIUrl":"https://doi.org/10.1007/s44251-023-00004-7","url":null,"abstract":"Abstract In this paper we have studied adsorption and surface reactions of acetylene and ethylene on Co(0001) in detail by temperature desorption spectrum (TDS), X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). C 2 H 4 adsorption at 130 and 300 K followed by subsequent heating mainly forms C 2 clusters and graphitic carbon, respectively, while C 2 H 4 decomposes at 400 and 500 K to form dominant graphitic carbon and carbon adatoms, respectively. C 2 H 2 molecularly adsorbs at 130 K but exclusively dehydrogenates upon heating. The resulting C 2 H 2 (a) species at low coverages remains stable up to 400 K and then exclusively dehydrogenates into C 2 clusters, while the resulting C 2 H 2 (a) species at high coverages remains stable up to 310 K and then majorly dehydrocyclizates into (C 2 H) n intermediates with ring structures at 340 K which further dehydrogenates into graphitic carbon, and minorly dehydrogenates into C 2 clusters. Exposed at 370 K, C 2 H 2 dehydrocyclizates into (C 2 H) n intermediates with ring structures. These temperature and coverage dependent surface reactions of C 2 H 2 and C 2 H 4 on Co(0001) greatly enrich our fundamental understanding of Co-catalyzed F-T synthesis reaction.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-27DOI: 10.1007/s44251-023-00001-w
Qing Hu, Yuan Li, Y. Frank Cheng
Abstract The work combined scanning Kelvin probe force microscopy measurements and finite element modelling to study the diffusion and distribution of hydrogen (H) atoms at metallurgical microphases contained in X52 pipeline steel. Results show that the pearlite contained in the steel is more stable than the ferrite during electropolishing, as indicated by the measured topographic profiles and Volta potentials. The hydrogen (H)-charging enhances the electrochemical activity of both pearlite and ferrite, as shown by increased Volta potential and thus the decreased work function. As the H-charging time increases, the Volta potentials of both phases further increase, implying that their activities increase with the H-charging time. The pearlite has a greater Volta potential and thus a lower work function than the ferrite. This is associated with more H atoms accumulating at the pearlite than at the ferrite. The H atom diffusion and accumulation are affected by H diffusivity at phase boundaries, H-trap binding energy and the number of traps in the steel.
{"title":"Distribution of hydrogen atoms at metallurgical microphases of X52 pipeline steel studied by scanning Kelvin probe force microscopy and finite element modelling","authors":"Qing Hu, Yuan Li, Y. Frank Cheng","doi":"10.1007/s44251-023-00001-w","DOIUrl":"https://doi.org/10.1007/s44251-023-00001-w","url":null,"abstract":"Abstract The work combined scanning Kelvin probe force microscopy measurements and finite element modelling to study the diffusion and distribution of hydrogen (H) atoms at metallurgical microphases contained in X52 pipeline steel. Results show that the pearlite contained in the steel is more stable than the ferrite during electropolishing, as indicated by the measured topographic profiles and Volta potentials. The hydrogen (H)-charging enhances the electrochemical activity of both pearlite and ferrite, as shown by increased Volta potential and thus the decreased work function. As the H-charging time increases, the Volta potentials of both phases further increase, implying that their activities increase with the H-charging time. The pearlite has a greater Volta potential and thus a lower work function than the ferrite. This is associated with more H atoms accumulating at the pearlite than at the ferrite. The H atom diffusion and accumulation are affected by H diffusivity at phase boundaries, H-trap binding energy and the number of traps in the steel.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract With the development of technology in aerospace, medical devices and other fields, high-performance difficult-to-machine materials have been widely used in these fields due to their good comprehensive mechanical properties. However, when using traditional machining methods, it is difficult to ensure the machining accuracy and surface quality, and at the same time, there are problems such as serious tool wear and low machining efficiency. Laser-assisted machining (LAM) technology is an advanced manufacturing process that softens the material in the machining area through the preheating effect of the laser, thus reducing the surface hardness of the material and improving the machinability of the material, which has the advantages of high efficiency and economy in machining difficult-to-machine materials. This paper introduces the common methods of establishing thermal models and simulation modeling of removal behavior in the LAM material removal process, summarizes the research progress on the removal behavior of LAM processing of various difficult-to-machine materials, and analyzes the shortcomings and challenges of the current research. Finally, the key issues of LAM material removal mechanism are proposed, and the development direction of LAM material removal technology is envisioned in order to provide a reference for the research and development in this field.
{"title":"A review of research on material removal mechanisms for laser-assisted machining of difficult-to-machine materials","authors":"Guijian Xiao, Jingzhe Wang, Shengwang Zhu, Yi He, Zhenyang Liu, Yun Huang","doi":"10.1007/s44251-023-00007-4","DOIUrl":"https://doi.org/10.1007/s44251-023-00007-4","url":null,"abstract":"Abstract With the development of technology in aerospace, medical devices and other fields, high-performance difficult-to-machine materials have been widely used in these fields due to their good comprehensive mechanical properties. However, when using traditional machining methods, it is difficult to ensure the machining accuracy and surface quality, and at the same time, there are problems such as serious tool wear and low machining efficiency. Laser-assisted machining (LAM) technology is an advanced manufacturing process that softens the material in the machining area through the preheating effect of the laser, thus reducing the surface hardness of the material and improving the machinability of the material, which has the advantages of high efficiency and economy in machining difficult-to-machine materials. This paper introduces the common methods of establishing thermal models and simulation modeling of removal behavior in the LAM material removal process, summarizes the research progress on the removal behavior of LAM processing of various difficult-to-machine materials, and analyzes the shortcomings and challenges of the current research. Finally, the key issues of LAM material removal mechanism are proposed, and the development direction of LAM material removal technology is envisioned in order to provide a reference for the research and development in this field.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/29794
R. Ranjan, Kamla Rawat, H. Bohidar
TX-100 molecular hydrogels exhibited re-entrant melt-gel-sol phase transition driven solely by dilution, which sequentially altered the self-assembly of the micellar formations and their population was investigated through the monitoring of the physical parameters namely, solution viscosity, particle size histogram, ergodicity, and gel rigidity modulus. This phenomenon was noticed at 20°C in the TX-100 concentration region of 0.2 to 1.2 M much above the critical micellar concentration of 0.22 mM. The particle size histograms revealed the presence of spherical micelles (size »3 nm) in the solution ([TX-100] < 0.5 M) which formed entangled wormlike cylindrical micelles (apparent hydrodynamic radius » 50 nm) when (0.5 M< [TX-100] < 0.9 M) giving rise to a gel-like structure. Further increase in the TX-100 concentration increased the propensity of these wormlike cylindrical micelles that got randomly distributed creating a dense melt phase. Interestingly, we observed transition solely driven by dilution which defined complete re-entrant behavior at room temperature. These molecular gels could be created by dilution of the melt or concentration of the sol unlike in the polymer gels. Remarkably, this hitherto little known unique phenomenon was exhibited by a simple system of non-ionic surfactant solution. Thus, we have a hydration reversible gel at our disposal which has a special place in soft matter arena.
{"title":"Dilution Driven Self-assembly and Re-entrant Phase Transition in Molecular Hydrogels","authors":"R. Ranjan, Kamla Rawat, H. Bohidar","doi":"10.18311/jsst/2021/29794","DOIUrl":"https://doi.org/10.18311/jsst/2021/29794","url":null,"abstract":"TX-100 molecular hydrogels exhibited re-entrant melt-gel-sol phase transition driven solely by dilution, which sequentially altered the self-assembly of the micellar formations and their population was investigated through the monitoring of the physical parameters namely, solution viscosity, particle size histogram, ergodicity, and gel rigidity modulus. This phenomenon was noticed at 20°C in the TX-100 concentration region of 0.2 to 1.2 M much above the critical micellar concentration of 0.22 mM. The particle size histograms revealed the presence of spherical micelles (size »3 nm) in the solution ([TX-100] < 0.5 M) which formed entangled wormlike cylindrical micelles (apparent hydrodynamic radius » 50 nm) when (0.5 M< [TX-100] < 0.9 M) giving rise to a gel-like structure. Further increase in the TX-100 concentration increased the propensity of these wormlike cylindrical micelles that got randomly distributed creating a dense melt phase. Interestingly, we observed transition solely driven by dilution which defined complete re-entrant behavior at room temperature. These molecular gels could be created by dilution of the melt or concentration of the sol unlike in the polymer gels. Remarkably, this hitherto little known unique phenomenon was exhibited by a simple system of non-ionic surfactant solution. Thus, we have a hydration reversible gel at our disposal which has a special place in soft matter arena.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48130824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/24099
N. Vinoth, L. Bhaskara Rao
This article provides a summary of some of the most current research on the delivery of drugs to the lungs, as well as a discussion of some of the limitations of these studies. Nebulizers have been in use for more than a century to deliver aerosolized drugs to patients suffering from respiratory disorders. Aerosol devices such as these are the best option for people who have trouble managing their inhalation. Because of the actuation required, pressurised Metered-Dose Inhalers (pMDI) and Dry Powder Inhalers (DPI) are unable to generate the necessary inspiratory flow required for successful aerosol drug delivery. Currently, we are looking into how the working mechanism of different nebulizers interacts with the physicochemical features of the formulations. We are looking into a wide range of devices, such as jet, ultrasonic, and vibrating-mesh nebulizers. In this study, the researchers hope to describe the many different types of nebulizers that are currently available on the market, evaluate their performance in aerosol drug delivery, and recommend treatment approaches for patients with chronic obstructive pulmonary disease.
{"title":"Recent Studies on the Drug Delivery of Nebulizers - A Review","authors":"N. Vinoth, L. Bhaskara Rao","doi":"10.18311/jsst/2021/24099","DOIUrl":"https://doi.org/10.18311/jsst/2021/24099","url":null,"abstract":"This article provides a summary of some of the most current research on the delivery of drugs to the lungs, as well as a discussion of some of the limitations of these studies. Nebulizers have been in use for more than a century to deliver aerosolized drugs to patients suffering from respiratory disorders. Aerosol devices such as these are the best option for people who have trouble managing their inhalation. Because of the actuation required, pressurised Metered-Dose Inhalers (pMDI) and Dry Powder Inhalers (DPI) are unable to generate the necessary inspiratory flow required for successful aerosol drug delivery. Currently, we are looking into how the working mechanism of different nebulizers interacts with the physicochemical features of the formulations. We are looking into a wide range of devices, such as jet, ultrasonic, and vibrating-mesh nebulizers. In this study, the researchers hope to describe the many different types of nebulizers that are currently available on the market, evaluate their performance in aerosol drug delivery, and recommend treatment approaches for patients with chronic obstructive pulmonary disease.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47776995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/23899
Rathinasamy Sampathkumar, V. Balachandar, D. Gopalakrishnan
Dielectric relaxation studies of acetate buffer solutions of Sodium Dodecyl Sulphate (SDS- anionic), Cetyl Trimethyl Ammonium Bromide (CTAB- cationic), Tween 80 (TW-80-non-ionic), Betaine Anhydrous (BA- zwitterionic) surfactants have been examined in the frequency region between 1GHz and 25GHz for various concentrations of surfactants at the temperatures of 283, 288, 293 and 298K using time domain dielectric spectroscopy. The obtained corrected loss spectra of all the amphiphiles except betaine anhydrous in acetate buffer solution depicted peaks near 1-2GHz and 15GHz, respectively. For betaine anhydrous, expected peak was not observed in the 1-2GHz frequency region. The peak ascertained near 15GHz, and another peak about 1-2GHz was accorded to free water relaxation and bound water reorientation of the surfactant micelles, and has acquired the reliance of temperature with concentration in detail. Single Debye and Cole-Cole function was employed to compute the relaxation times of free water and bound water, respectively. The Arrhenius plot was used to calculate the enthalpy and entropy for the micelle forming surfactants.
{"title":"Dielectric Relaxation Studies on the Hydration Dynamics of Ionic, Non-Ionic and Zwitterionic Surfactants in Aqueous Acetate Buffer Solution","authors":"Rathinasamy Sampathkumar, V. Balachandar, D. Gopalakrishnan","doi":"10.18311/jsst/2021/23899","DOIUrl":"https://doi.org/10.18311/jsst/2021/23899","url":null,"abstract":"Dielectric relaxation studies of acetate buffer solutions of Sodium Dodecyl Sulphate (SDS- anionic), Cetyl Trimethyl Ammonium Bromide (CTAB- cationic), Tween 80 (TW-80-non-ionic), Betaine Anhydrous (BA- zwitterionic) surfactants have been examined in the frequency region between 1GHz and 25GHz for various concentrations of surfactants at the temperatures of 283, 288, 293 and 298K using time domain dielectric spectroscopy. The obtained corrected loss spectra of all the amphiphiles except betaine anhydrous in acetate buffer solution depicted peaks near 1-2GHz and 15GHz, respectively. For betaine anhydrous, expected peak was not observed in the 1-2GHz frequency region. The peak ascertained near 15GHz, and another peak about 1-2GHz was accorded to free water relaxation and bound water reorientation of the surfactant micelles, and has acquired the reliance of temperature with concentration in detail. Single Debye and Cole-Cole function was employed to compute the relaxation times of free water and bound water, respectively. The Arrhenius plot was used to calculate the enthalpy and entropy for the micelle forming surfactants.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45034914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/25053
Sumita Roy, Monali Maiti, Siddhartha Das
Boronic acid based amphiphiles are new generation green surfactant materials because they degrade to produce environmentally friendly boric acid. This study describes the interfacial property as well as aggregation behaviour of two pyridine based boronic acid amphiphiles containing amide linkage in hydrocarbon chain named sodium salt of 2-amidodecyl pyridine-5-boronic acid (SADPB) and sodium salt of 2-amidododecyl pyridine-5-boronic acid (SADDPB). Tensiometry study was executed for investigation of interfacial properties of pyiridine based boronic acid derivatives. Polarity and viscosity of the microenvironment of aggregates was investigated using fluorescence technique. DLS measurement suggested size of the assemblies of SADDPB is larger than SADPB in solutions. XRD technique was employed to examine arrangement of the hydrophobic tails in the bilayer aggregates. TEM technique was utilised to scrutinize aggregate morphology in solutions. The findings showed prospect of these amphiphiles to be applicable as drug carrier in pharmaceutical industries.
{"title":"Self-Assembly Study of Sodium Salt of 2-Amidodecyl Pyridine-5-Boronic Acid and Sodium Salt of 2-Amidododecyl Pyridine-5-Boronic Acid in Buffer Solution","authors":"Sumita Roy, Monali Maiti, Siddhartha Das","doi":"10.18311/jsst/2021/25053","DOIUrl":"https://doi.org/10.18311/jsst/2021/25053","url":null,"abstract":"Boronic acid based amphiphiles are new generation green surfactant materials because they degrade to produce environmentally friendly boric acid. This study describes the interfacial property as well as aggregation behaviour of two pyridine based boronic acid amphiphiles containing amide linkage in hydrocarbon chain named sodium salt of 2-amidodecyl pyridine-5-boronic acid (SADPB) and sodium salt of 2-amidododecyl pyridine-5-boronic acid (SADDPB). Tensiometry study was executed for investigation of interfacial properties of pyiridine based boronic acid derivatives. Polarity and viscosity of the microenvironment of aggregates was investigated using fluorescence technique. DLS measurement suggested size of the assemblies of SADDPB is larger than SADPB in solutions. XRD technique was employed to examine arrangement of the hydrophobic tails in the bilayer aggregates. TEM technique was utilised to scrutinize aggregate morphology in solutions. The findings showed prospect of these amphiphiles to be applicable as drug carrier in pharmaceutical industries.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44674506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/28590
O. Lekshmy, K. S. Beena Kumari, R. Sudha Devi
Magnesium based metal - organic Framework (MOF) was synthesized by using Benzene Di-Carboxylic acid (BDC), MgSO4.7H2O and a flower extract of Clitoria ternatea. The prepared MOF was characterized by FTIR spectrum, SEM-EDS, XRD, DLS and PL Spectrum. The crystalline nature of the synthesized MOF was revealed in XRD patterns. The nano particle nature of the MOF was confirmed from the SEM pictures. FT-IR spectra showed a peak at 520cm-1 designated characteristic absorption bands of synthesized Mg-MOF nano particles. The zeta potential value showed that the surface charge of the synthesized MOF is neutral and hence disperse in solution without having any tendency for agglomeration and coagulation on standing. The photoluminescence spectra indicated luminescent nature and hence this nano crystalline MOF finds very good application as luminescent material and as sensing material.
{"title":"Ecofriendly Synthesis and Characterization of Magnesium based Metal - Organic Frame Work","authors":"O. Lekshmy, K. S. Beena Kumari, R. Sudha Devi","doi":"10.18311/jsst/2021/28590","DOIUrl":"https://doi.org/10.18311/jsst/2021/28590","url":null,"abstract":"Magnesium based metal - organic Framework (MOF) was synthesized by using Benzene Di-Carboxylic acid (BDC), MgSO4.7H2O and a flower extract of Clitoria ternatea. The prepared MOF was characterized by FTIR spectrum, SEM-EDS, XRD, DLS and PL Spectrum. The crystalline nature of the synthesized MOF was revealed in XRD patterns. The nano particle nature of the MOF was confirmed from the SEM pictures. FT-IR spectra showed a peak at 520cm-1 designated characteristic absorption bands of synthesized Mg-MOF nano particles. The zeta potential value showed that the surface charge of the synthesized MOF is neutral and hence disperse in solution without having any tendency for agglomeration and coagulation on standing. The photoluminescence spectra indicated luminescent nature and hence this nano crystalline MOF finds very good application as luminescent material and as sensing material.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42958452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.18311/jsst/2021/26045
Naveen Kumar, R. Tyagi
Herein, we have investigated the mixed micellar behavior of carboxylate anionic dimeric surfactants (CAD12 and CAD16) with commercial surfactants; anionic type i.e., sodium dodecyl sulfate, cationic i.e., cetyltrimethylammonium bromide and nonionic i.e., polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether. The CMC values of mixed surfactants obtained from conductivity data decrease with a mole fraction of dimeric surfactants. The micellar characteristics (ideal CMC) and mutual interaction parameters (β) have been computed with the aid of theoretical models proposed by Clint, and Rubingh. In addition to this, thermodynamic parameters of micellization like 0 ΔG0mic, ΔH0mic, and ΔS0mic were evaluated and discussed.
{"title":"Mixed Micelle Properties of Anionic Dimeric Surfactants with Anionic, Cationic, and Nonionic Surfactants","authors":"Naveen Kumar, R. Tyagi","doi":"10.18311/jsst/2021/26045","DOIUrl":"https://doi.org/10.18311/jsst/2021/26045","url":null,"abstract":"Herein, we have investigated the mixed micellar behavior of carboxylate anionic dimeric surfactants (CAD12 and CAD16) with commercial surfactants; anionic type i.e., sodium dodecyl sulfate, cationic i.e., cetyltrimethylammonium bromide and nonionic i.e., polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether. The CMC values of mixed surfactants obtained from conductivity data decrease with a mole fraction of dimeric surfactants. The micellar characteristics (ideal CMC) and mutual interaction parameters (β) have been computed with the aid of theoretical models proposed by Clint, and Rubingh. In addition to this, thermodynamic parameters of micellization like 0 ΔG0mic, ΔH0mic, and ΔS0mic were evaluated and discussed.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47660642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：