Self-assembly of hierarchical N-heterocycles-inorganic materials into three-dimensional structure for superior corrosion protection

Al Zoubi, Wail,Ko, Young Gun Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.356 No.-

<P><B>Abstract</B></P> <P>Organic-inorganic materials based on porous inorganic materials predesigned hydrophobic multilayer coatings are well-established in the literature, but N-heterocyclic donor to prepare such flower-like structures with chemical bonds has not been reported to date. Here, organic-inorganic hybrid materials prepared by simultaneous coordination-driven assembly of heterocyclic molecules and porous materials are reported. Immersion porous inorganic film with 8-hydroxyquinoline (8-HQ) in ethanol solution leads, within a few days, to the formation of flowerlike organic-inorganic materials. Then, the organic layer grows on the inorganic surface, resulting in formation of charge transfer complex (Mgq<SUB>2</SUB> and Alq<SUB>3</SUB>) between N-heterocycles and metal ions (Al<SUP>+3</SUP> and Mg<SUP>2+</SUP>). A spontaneous self-organization of these organic molecules is then triggered to form stable hierarchical N-heterocycles-inorganic materials, resulting from the non-covalent π-π bonds and inter-molecular hydrogen bonds between aromatic molecules. Finally, the electrochemical performance was enhanced in the order PEO-HQ4 (0.1 M 8-HQ for 2 days), PEO-HQ3 (0.05 M 8-HQ for 2 days), PEO-HQ2 (0.1 M 8-HQ for 1 day), PEO-HQ1 (0.05 M 8-HQ for 1 day), and PEO, which was discussed on the basis of polarization interpretation. The results indicate that magnesium film coated with the self-assembled 8-HQ/inorganic materials grown via plasma electrolytic oxidation and dip-chemical coating are corroded several times slower in an aerated NaCl solution as compared to the corrosion rate of bare magnesium.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flower-like materials prepared by heterocyclic molecules and porous materials. </LI> <LI> Immersion porous inorganic film with solution of 8-hydroxyquinoline leads to the formation of organic-inorganic materials. </LI> <LI> The organic layer grows on the inorganic surface, resulting in formation of charge transfer complex. </LI> <LI> The extraordinary electrochemical stability was enhanced in the presences of heterocycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Organic-Inorganic Hybrid Thermoelectric Material Synthesis and Properties

Kim, Jiwon,Lim, Jae-Hong The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.4

Organic-inorganic hybrid thermoelectric materials have obtained increasing attention because it opens the possibility of enhancing thermoelectric performance by utilizing the low thermal conductivity of organic thermoelectric materials and the high Seebeck coefficient of inorganic thermoelectric materials. Moreover, the organic-inorganic hybrid thermoelectric materials possess numerous advantages, including functional aspects such as flexibility or transparency, low cost raw materials, and simplified fabrication processes, thus, allowing for a wide range of potential applications. In this study, the types and synthesis methods of organic-inorganic thermoelectric hybrid materials were discussed along with the methods used to enhance their thermoelectric properties. As a key factor to maximize the thermoelectric performances of hybrid thermoelectric materials, the nanoengineering to control the nanostructure of the inorganic materials as well as the modification of the organic material structure and doping level are considered, respectively. Meanwhile, the interface between the inorganic and organic phase is also important to develop the hybrid thermoelectric module with excellent reliability and high thermoelectric efficiency in addition to its performance in various electronic devices.

Templated Organic and Hybrid Materials for Optoelectronic Applications

Haberkorn, Niko,Lechmann, Maria C.,Sohn, Byeong Hyeok,Char, Kookheon,Gutmann, Jochen S.,Theato, Patrick WILEY-VCH Verlag 2009 Macromolecular Rapid Communications Vol.30 No.14

<P>The review highlights different approaches to template organic materials as well as hybrid materials that find or are expected to find application in optoelectronic devices. The first templating approach focuses on the use of preformed nanoporous membranes as templates for organic materials and polymeric materials. Such nanoporous templates can be track-etched membranes, anodic aluminum oxide membranes and other variants thereof, or block copolymer templates. Further, opals have been described as templates. In the second part, we have summarized developments that take advantage of self-assembly processes to pattern hybrid materials. Examples are sol-gel templating techniques using amphiphiles, evaporation-induced self-assembly, lyotropic templating as well as templating from block copolymers. Both routes are very promising templating approaches for optoelectronic materials and represent complementary rather than competing techniques.</P><P> <img src='wiley_img/10221336-2009-30-14-MARC200900213-gra001.gif' alt='wiley_img/10221336-2009-30-14-MARC200900213-gra001'> </P> <B>Graphic Abstract</B> <P>This review compiles different approaches to template organic materials as well as hybrid materials that find application in optoelectronic devices. Two templating approaches are presented and discussed in detail, e.g. the use of preformed nanoporous membranes as templates for organic materials, and self-assembly processes of materials to pattern hybrid materials. Both routes are very promising templating approaches for optoelectronic materials and represent complementary rather than competing techniques. <img src='wiley_img/10221336-2009-30-14-MARC200900213-content.gif' alt='wiley_img/10221336-2009-30-14-MARC200900213-content'> </P>

상온 재활용 아스팔트 혼합물의 초기 상온양생 강도 발현을 위한 무기질 재료 반응특성 분석

김영민,최현준,류주열 한국도로학회 2018 한국도로학회논문집 Vol.20 No.6

PURPOSES: The object of this study is to select appropriate inorganic materials, and find the best mixing formula to secure fast curing time and enough initial strength, and then to evaluate the durability of the asphalt mixtures according to the degree of addition of the compound manufactured by the determined blending ratio. METHODS : The breaking time and reactivity between seven kinds of inorganic minerals, and the selected recycled aggregate and emulsified asphalt were compared to determine the best initial curing strength for the mixtures. Then, three inorganic materials were chosen as the materials that provide good breaking time and reactivity, and the best mixing formula for the three materials was determined. The chemical composition of the compound manufactured using the mixing formula was analyzed by energy dispersive x-ray system method. Finally, indirect tensile strength (ITS) test was performed (for two days) at room temperature to determine the proper amount of additives that will provide the best initial strength. RESULTS: From the results of the reactivity test, the best mixing formula (A:C:G = 60:30:10) for the three selected inorganic materials with short braking time and high reactivity was determined. The four types of cold reclaimed asphalt mixtures for ITS testing were manufactured by adding the inorganic material compounds at 0%, 3%, 5%, and 7%, and the ITS values were measured after two curing days. The ITS values at 5% and 7% were 0.308 MPa and 0.415 MPa, respectively. The results of quality control tests (Marshall stability, porosity, flow value, etc.) at 5% and 7% satisfied the specification criterion for the cold recycled asphalt mixtures. CONCLUSIONS : The selected inorganic materials (A, C, and G) and the best mixing formula (A:C:G = 60:30:10) accelerated the reaction with emulsified asphalt and shortened the curing time. Depending on the inorganic material used, the breaking time and reactivity can be directly related or unrelated. This is because of the chemical compositions of recycled aggregates, infiltrated foreign matter, and chemical reactions between the inorganic materials and other materials. Therefore, it is important to select the proper materials and the best mixing formula when evaluating the characteristics of the practically used materials such as recycled aggregates, inorganic materials, and emulsified asphalt.

Effect of SiO2 Aerogel on the Properties of Inorganic Cementing Materials

Yunan Wan,Jianhong Wang,Zhiyong Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8

SiO2 aerogel powder has ultralow weight and thermal conductivity, and it cannot be easily dispersed in inorganic cementing materials (i.e., it is incompatible with inorganic cementing materials). In this study, the properties of inorganic cementing materials with hemihydrate gypsum and α-hemihydrate gypsum as main cementing materials were investigated. Moreover, the property changes resulting from the addition of SiO2 aerogel to inorganic cementing materials were examined. Based on the obtained results, the composites of SiO2aerogel and inorganic cementing materials with optimal properties were prepared and investigated. The results revealed that when the composition mass ratio of the inorganic cementing material was 1:3:9:0.8 (fly ash:cement:hemihydrate gypsum:lime), the compressive strength of the cementing material was largest, reaching 7.71 MPa after 28 days of curing. Moreover, when the composition mass ratio of the inorganic cementing material was 1:3:9:0.4/0.6 (fly ash:cement:hemihydrate gypsum:lime), its softening coefficient was highest, reaching 0.97. Under the same mass ratio, the 28-day compressive strength of the α-hemihydrate gypsum-based cementing material was 2.4 times that of the plaster-based cementing material. When the SiO2 aerogel was added to the gypsum-based composite cementing material, the compressive strength and softening coefficient decreased with increasing SiO2 aerogel’s content.

Developed filler for crack restoration using porous inorganic materials

김재훈,허훈,유은성,전재성,심광보,박춘근 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

Recently, social concern about the stability of the ground is rising due to frequent occurrences of sink hole phenomenon. In order to prevent traffic accidents and secondary damages to surrounding facilities. It is filled with aggregate then closed by topping mortar/asphalt construction. However, as a temporary measure. there is a possibility of further continuous coexistence due to the leakage in the ground, and problems of compaction are reported. Additional fracture problems arise due to cracks. In this study, the development of crack restorative materials using inorganic porous materials and the development of ground filler materials are being developed. The purpose of this study is to investigate the impregnation of the porous materials and the restoring behavior of the cracked part by impregnating porous restorative materials composed of a swelling agent, and a reaction promoter in a porous body using an inorganic porous materials.

칼슘실리케이트 무기 단열소재의 양생기간에 따른 물리 특성

박재완 ( Park Jae-wan ),추용식 ( Chu Yong-sik ),정재현 ( Jeong Jae-hyun ) 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.6

칼슘실리케이트계 무기단열소재는 주원료로 시멘트를 90%를 사용하는 다공성 무기단열소재이다. 기존 무기단열소재와 달리 고온의 수화반응 처리가 없기 때문에 가격이 저렴하며, 불연소재의 원료를 사용하여 화제의 위험성도 적다. 칼슘실리케이트 단열소재는 0.13g/cm³의 밀도와 0.050W/mK이하의 우수한 열전도도를 갖는 단열소재이다. 칼슘실리케이트 단열소재는 경량화 될수록 내부 기포를 다량 함유해야 하며 기포를 다량 함유함에 따라 단열성 또한 우수해진다. 본 연구에서는 다량의 기포를 함유하며 일정강도발현을 목표로, 칼슘실리케이트계 무기단열소재의 주성분인 시멘트가 수화반응에 따라 초기 및 장기강도발현하는 특성을 이용하여 칼슘실리케이트계 무기단열소재에 적용하여 물리적 특성을 알아보고자 하였다. Calcium silicate inorganic insulating material is a porous material which is made of 90 wt% of cement. Unlike existing inorganic insulation materials, it is produced without high temperature curing process and also it costs much less than existing inorganic insulation materials. It is an innovative insulation material that supplemented disadvantages of conventional inorganic insulation material. Researches and developments about inorganic insulation materials have been actively researched abroad. Calcium silicate insulation has 0.13g/cm3 of specific gravity. Its heat conductivity is under 0.050W/mK, which it similar to conventional inorganic insulation. However, it has weak compressive strength compared to other inorganic insulation. The point of this research is to manifest that calcium silicate inorganic insulating material can have certain compressive strength after curing process with high insulating performance and to find out the proper curing methods and period.

Inorganic-organic hybrid halide perovskite materials for solution-processable photovoltaic applications

노준홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

A number of cheap and solution-processable materials have been studied as photovoltaic active layer to develop inexpensive and highperformance photovoltaic systems. Organic materials with advantages for solution process at low temperature had attracted the great interest but the devices using them have a limit due to their low-performance. Recently, inorganic-organic hybrid materials such as CH₃NH₃PbI₃ and CH(NH₂)₂PbI₃ have brought the surprising high performance in spite of using low-cost fabrication process. The materials have a AMX3 perovskite crystal structure so that photovoltaic devices using them are called by ‘perovskite solar cells’. The solution processed perovskite solar cells are showing high efficiency exceeding 20%. In this talk, the results for development of perovskite solar cells in KRICT will be introduced.

비가수 솔-젤 법을 이용한 저유전율 유-무기 하이브리드 재료

최천기 ( Chaun Gi Choi ),김우수 ( Woo Soo Kim ),배병수 ( Byeong Soo Bae ) 대한금속재료학회 ( 구 대한금속학회 ) 2005 ELECTRONIC MATERIALS LETTERS Vol.1 No.1

In this paper, we report the fabrication of fluorinated organic-inorganic hybrid materials and the investigation of the effects of fluorine contents on the dielectric constant of the fluorinated organic-inorganic hybrid materials. Thickness of the hybrid thin film was about 500 nm by single spin coating and the adhesion between the substrate and the hybrid film was good. Dielectric constants of hybrid thin films decreased from 4.2 to 2.98 (at 1 MHz) as the fluorine content increased.

SAW-ED 시스템을 이용한 유/무기 소재 증착에 관한 연구

김현범(Hyun Bum Kim),김경환(Kyung Hwan Kim),시디쿠이 가야수딘(Siddiqi Ghayas),임종환(Jong Hwan Lim),양형찬(Hyoung Chan Yang),최경현(Kyung Hyun Choi) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.5

In various industries, many researches studies have been done in using nano thin film fabrication technology. In the field of printed electronics, various electronic devices can be fabricated using a direct printing process of on multiple functional materials. It has the advantages of low prices, environment-friendly environmentally friendly, flexibleility, large scale, mass production produced, simple process and so on. In this study, a viable thin film fabrication technology has beenwas introduced using the surface acoustic wave mechanism for thin film deposition. Fabrication of thin films using organic, inorganic and composite of organic/inorganic materials have been were analyzed through the experimental research. In this experiment, organic material MEH:PPV, inorganic material ZnO and composite material MEH:PPV/ZnO have been depo sited as thin films.