Masruroh -

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• Doctor of Engineering
• Head of Department at University of Brawijaya

Chitosan is derived from the deacetylation of chitin using a strong base. Chitin, a biopolymer commonly found in oyster pearl shells (Pinctada maxima sp) , is transformed into chitosan. This study aims to investigate the properties of chitosan extracted from oyster pearl shells, focusing on the effect of variations in NaOH concentration on the chit...

Reduced graphene oxide (rGO) was successfully synthesized from graphene oxide (GO) using ascorbic acid as a reducing agent, combined with a sonication process to improve microstructural transformation and enhance optical properties. The primary objectives of this study were to evaluate the role of ascorbic acid in altering the microstructure of rGO...

This study investigated the influence of the morphology of a polypyrrole (PPy) functional layer on the acoustic impedance and PPy-QCM characteristics. In this study, the PPy thin layer was deposited on 1 side of QCM, following the dimension of the Au electrode. The layer production method yielded a simple design of a PPy-functionalized QCM. The imp...

Mata pelajaran Fisika merupakan mata pelajaran yang kurang diminati siswa sekolah menengah karena identik dengan rumus-rumus yang sulit. Penggunaan alat peraga pendidikan dapat membantu siswa untuk memahami konsep suatu materi pelajaran dengan lebih baik. Sayangnya, tidak semua sekolah memiliki sarana dan prasarana pembelajaran yang memadai, termas...

This paper investigates the use of tantalum aluminum carbide ( ${\rm Ta}_2{\rm AlC}$ ) as a passive pulse modulator for generating ultrafast mode-locked pulses in an erbium-doped fiber (EDF) laser cavity. The ${{\rm Ta}_2}{\rm AlC}$ modulator was prepared via an embedding method using polyvinyl alcohol as the host matrix, exhibiting a saturable abs...

We report the experimental observation of domain-wall type dark solitons in an all-fiber ring cavity erbium-doped fiber laser (EDFL) mode-locked with a Titanium Tin Carbide (Ti2SnC) saturable absorber (SA). The SA, featuring a modulation depth of 8.2%, was created by incorporating Ti2SnC particles into a polyvinyl film. Dark pulse formation is attr...

QCM-based alcohol vapor sensors have been widely researched, and various materials have been deposited onto the sensor surface to serve as a functional layer. However, non-conductive polymers such as SBS as a functional layer for alcohol sensors are still minimally reported. In this study, the SBS was deposited on 1 side of the QCM using the spin c...

Radar-absorbent materials (RAMs) have become essential technologies in fields that require them, such as the military. Their working principle is that they absorb electromagnetic waves and prevent their reflection. In developing the manufacturing of RAMs, high-performance materials are needed for effective use as RAMs. In general, RAMs possess two...

Chitosan is natural polymer with abundant availability and unique characteristics. The purpose of this study was to investigate the effects of various isolation methods on chitosan properties. Chitosan was obtained by isolation method using oyster pearl shell ( Pinctada maxima sp.). The parameters of the deacetylation process are the comparison of...

This study aims to determine the highest cellulose purity based on variations in NaOH concentration and to characterize nanocellulose fiber from corn cob waste. Nanocellulose fiber was obtained using chemical-mechanical treatments. Chemical treatment consists of pretreatment, de-lignification, and bleaching stages. While mechanical treatment consis...

Increasing bacterial resistance to antibiotics has become a serious threat to global public health. In this context, this study aims to evaluate the antimicrobial activity of titanium dioxide nanoparticles (TiO2 NPS) synthesized using the sol-gel method. TiO2 NPS samples were prepared and characterized for morphology via field-emission scanning ele...

A gold-coated Kretschmann setup has been constructed and explored as a surface plasmon resonance (SPR) platform, specifically tailored for the detection of low-concentration sodium chloride (NaCl) solutions. The setup employs a BK7 prism coated with a 50 nm gold layer, serving as a plasmonic layer, to induce resonance. This resonance arises from th...

The modification of hydroxyapatite (HA) scaffolds into spherical forms can prevent inflammatory responses and promote faster bone growth compared to irregular scaffolds. HA must possess a porous structure with a porosity value to support bone regeneration. Droplet extrusion is the most widely applied and simplest method to produce hydroxyapatite sc...

Three surfactants, namely, cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and polyethylene glycol (PEG), were used to prevent particle agglomeration in TiO2 nanoparticle synthesis. The nanoparticles were produced using the sol–gel and ball milling (dry–wet–dry) techniques. Structural and morphological analyses were performed v...

HA/Gelatine bio composite is the main material in making scaffolds that have the advantage of biocompatibility and high biodegradability. One method of making scaffolds is using piston extrusion 3D printing technology, which is compatible with several types of materials, especially HA/gelatine biocomposites. This study aims to determine the effect...

The thickness and roughness of metal layers substantially affect the performance of surface plasmon resonance (SPR)-based sensors. The deposition methods, control parameters, and substrate characteristics influence the layer thickness and roughness. This study investigates the SPR characteristics of a polished optical fiber surface coated with gold...

The morphology of TiO2 nanoparticles deposited on a QCM sensor is crucial in its mechanical loading. Different heating treatments transform the morphology of TiO2 nanoparticles, affecting the loading and hence shifting the resonant frequency and changing the impedance QCM value. In this research, the deposition of TiO2 nanoparticles was carried out...

Hydroxyapatite is naturally found in bone tissue. Tissue engineering often utilizes synthetic hydroxyapatite biocomposite for bone alloplastic grafting. The bone graft shape and size accuracy can be realized using three dimensions (3D) printing technology. The most important part of the 3D printer is an extruder producing printable filament of the...

Morphological evolution and swelling were observed in the zinc phthalocyanine (ZnPc) layer on a quartz crystal microbalance (QCM) sensor treated with annealing. The morphology affects the swelling during analyte injection. The swelling effect can shorten the QCM sensor recovery time. The ZnPc layer was deposited on the surface of the polystyrene/QC...

Nanofiber scaffold has been widely developed as a tissue engineering material because it can imitate the ECM of bones. In this study, nanofiber scaffold is composed of polyvinyl alcohol (PVA), chitosan, polyethylene glycol (PEG), and hydroxyapatite (HAp) which have superior characteristics for tissue engineering applications. The nanofiber scaffold...

p>The sensitivity of a QCM-based VOCs sensor with two kinds of a metal phthalocyanine, i.e., copper phthalocyanine (CuPc) and zinc phthalocyanine (ZnPc) was examined for various VOCs. The sensitivity of the two metal phthalocyanine was determined by the compatibility of the overlapped metal orbitals (Cu(II) dan Zn(II)) and the corresponding VOCs. T...

This study synthesized collagen-chitosan/PVA nanofiber composites using the electrospinning method. Characterizations included Fourier transform infrared spectroscopy (FTIR) and surface morphology using scanning electron microscopy (SEM). Investigations were carried out on tensile strength, degradation rate, and antibacterial test. It was found tha...

This study aims to fabricate PYA/PEG/Chitosan nanofiber scaffolds for skin tissue engineering. The scaffolds in the nanofiber structure closely match with the ECM structure of the skin tissue. PYA/PEG/Chitosan nanofibers were prepared by electrospinning technique with various compositions (v/v) % (95:5, 90:10, 85:15, 80:20). The scaffold surface mo...

This work aims to determine how the scan rate affects PANI layers' morphology and resonance parameters deposited on quartz crystal microbalance (QCM). The PANI layer was produced using the electrodeposition method with a scan rate variation of 10 to 50 mV/s. The PANI layer deposited at a scan rate of 10 mV/s has an aggregate morphology, whereas the...

The deposition process using the sputtering method is a deposition technique that produces a thin layer. The sputtering method can be used with some modifications made to the deposition system. One of the identifications of the sputtering process can be made through the results of the Optical Emission Spectroscopy (OES) spectrum. By analyzing the O...

p>Gelatin-Hydroxyapatite (GHA) composite has been synthesized as a scaffold in bone tissue engineering. The purpose of this study was to find the optimal composition of the GHA scaffold composite which has the best mechanical properties. The independent variable in this study was the composition of HAp. Hydroxyapatite was synthesized by precipitati...

A functional layer is crucial in a QCM sensor, to immobilize target molecules. The microstructure of the layer determines the sensitivity of the sensor. On the other hand, the microstructure also affects the loading of the sensor. In this study, impedance analysis was used to investigate the relationship between the microstructure and the viscoelas...

Air sterilizer is one of the essential components in combating the Covid-19. A wind tunnel model of the air sterilizer using a dielectric barrier discharge plasma is proposed to destroy the virus by direct contact with the plasma. Dangerous ozone production in the plasma reactor should be controlled to a safe level. Two parameters affecting the ozo...

TiO 2 synthesis using sonochemical methods and their coating on the surface of the Quartz Crystal Microbalance (QCM) sensor utilizing the spin coating method has been carried out. The synthesis started by mixing 7 ml of titanium (IV) isopropoxide (TTIP) (97%) in 70 ml of ethanol (96%). The mixture of TTIP solution was stirred for 30 minutes. After...

QCM telah banyak digunakan sebagai biosensor dan sensor kimia. Tingkat sensitifitas yang dimilikinya terhadap perubahan massa pada permukaannya . Terdapat banyak aspek yang dapat mempengaruhi kerja QCM ketika memiliki kontak dengan larutan. Salah satunya adalah ketebalan lapisan matriks yang menjadi lapisan biologi yang akan diimobilisasikan di ata...

Abstrak Elektroda merupakan komponen penting dari sebuah superkapasitor. Pemilihan bahan elektroda dan fabrikasinya memainkan peran penting dalam meningkatkan kinerja kapasitif superkapasitor. Salah satu kriteria elektroda untuk superkapasitor adalah harus memiliki luas permukaan per satuan volume dan porositas yang tinggi, di samping elektroda har...

Three-cells dynamic lead-acid battery has been widely manufactured as the latest secondary battery technology. It is being carried out by 10 cycles of charge-discharge treatment with a various types of SoC, such as 100% (Full charge 5100 mAh), 50% (2550 mAh), 25% (1275 mAh) and discharge current of 0.8A. This experiment aims to analyze the treatmen...

Hydroxyapatite [HAp, Ca10(PO4)6(OH)2] was successfully synthesized using natural minerals, precisely limestone from Druju Indonesia. As a bone scaffold compound, HAp has a weakness of low mechanical properties therefore it needs to be mixed with polymeric materials, such as polyvinyl alcohol (PVA) to improve its mechanical properties. The PVA/HAp c...

The performance, sensitivity, and corrosion protection on the QCM sensor requirement be improved to maximize the value. Therefore, the functional material coating was carried out. The addition of the polystyrene and ZnPc deposited using the vacuum evaporation method. This study intends to the morphology structure and effect of the coating, to impro...

On type of Plasma is a Plasma DBD which is generated at atmospheric pressure. Scaffold hydroxyapatite (HA) is a bioceramic which widely developed nowadays in applications. The pores that are owned in the scaffold can effect a mechanical properties, namely compressive strength. Treatment by using Plasma DBD method is expected to have a good improvem...

QCM or quartz crystal microbalance is a well-known sensor technology that generates cycles of oscillation related to mass change on the crystal’s surface. This crystal works well when it has a frequency counter and an oscillator to drive the crystal and count the oscillation, and a good airflow regulator. This study developed a measurement system f...

Quartz Crystal Microbalance (QCM) works by using the principle of frequency shifting in quartz crystals due to mass deposition on the surface of the crystals. QCM sensors can be applied as chemical sensors and gas sensors. To increase its sensitivity and selectivity, QCM must be coated with active ingredients, one of which is Polyaniline (Pani). Th...

Surface texturing of a carbon-based thin film is the critical technology in the development of functional surface for many kinds of sensors. This study explored the possibilities of processing the carbon film’s surface by means of plasma etching to produce micro-pillars. Circular dots with a diameter of 25 μm, 50 μm, and 100 μm were printed on a th...

Nitrogen plasma treatment of a polystyrene layer in a vacuum chamber resulted in changes in its hydrophobicity properties. The purpose of this work was to investigate the effect of chamber pressure on nitrogen plasma treatment on the hydrophobicity properties of polystyrene surfaces. The plasma character was diagnosed by optical emission spectrosco...

Quartz Crystal Microbalance (QCM) sensor coating layer as selective and sensitive material was usually made in a thin layer to avoid any damping effect on the sensor. The coating thickness in the range of nanometer was typical. The used of a thick polymer coating was known in the range of less than 3 μm. Usually the coating layer was prepared to su...

Particle size plays an important role in the designs of calcium carbonate-based material. Small particle size in the order of micrometer of event nanometer size is preferred. The raw materials were ground from the big particle size to the smallest possible by using multistep grinding. In the laboratory, the common method to be used as the ball mill...

QCM or quartz crystal microbalance is a sensor that works based on the changes in the oscillation frequency of the crystal due to changes in mass on the surface. Therefore QCM can also be used as a gas sensor because it is expected that the change in part per million (PPM) volume of the gas will change the frequency of the oscillation. This researc...

Fine particles are particulate matters having a diameter less than 2.5 µm, ubiquitous in ambient air and mainly resulted from many emission sources. Several epidemiologic studies have investigated fine particles that have a relationship with an inflammatory response deep in the lung and red blood cells. For these reasons, the interest in real- time...

The interaction between the surface of the material and the ionic solution can cause many different effects on the material. One impact that might occur is material swelling. The swelling of the polymer in the form of thin films causes changes in the mechanical property of the materials. Swelling results in an expansion of the volume of the polymer...

In the present study, the eco-friendly and economical methods have been developed by employing natural iron sand as a main precursor to create Fe3O4/ZnO nanocomposites (NCs). The formation of Fe3O4/ZnO NCs was confirmed using XRD, synchrotron-based SAXS, FTIR spectroscopy, and SEM. The XRD results revealed that the Fe3O4 and ZnO crystallised spinel...

Microwave-assisted synthesis of zinc oxide-silver (ZnO-Ag) nanocomposite using clove (Syzygium aromaticum L.) oil has been investigated. Variation of solvents and irradiation time of microwave was studied. The product characterization was carried out using XRD, FT-IR, and SEM-EDS. The XRD analysis indicates ZnO-Ag nanocomposite has a polycrystallin...

In this study, we report green synthesis of Fe3O4 nanoparticles based on biosurfactant Saccharum officinarum extract using sonochemical method. The phase purity of the sample was characterized using an X-ray diffractometer (XRD). Based on the XRD characterization, the addition of biosurfactant S. officinarum did not alter the inverse spinel cubic o...

An investigation of the Optical Emission Spectroscopy (OES) to study the effect of the pressure chamber to the chemical species, electron temperature ( Te ) and electron density ( Ne ) was performed on RF 2 MHz plasma sputtering for carbon deposition. A carbon target and argon (Ar) gas were used to deposit carbon films. The carbon deposition was ca...

Copper Phthalocyanine (CuPc) is one material often used for the active layer on Quartz Crystal Microbalance (QCM) sensor. One important mechanism which can shorten the recovery time in the sensor is the swelling effect. The swelling effect is studied by observing the morphology of the layer and subsequent changes in QCM frequency during surface con...

Crown ether is a form of ethylene oxide cyclo-oligomer. Crown ether has a strong ability to form a complex with cations. The crown ether has been used as part of the electrochemical sensor and optical sensor because of its selectivity to several cations. There was no report on the use of the 18-crown-6-ether as a single coating layer on the QCM sen...

Electrolyte concentration is one of the important parameters on Lead-Acid Battery (LAB) outcome. Lead-acid battery has been made with static and dynamic electrolyte treatment where 4 variations of electrolyte concentration (20%, 30%, 40% and 50%) and 1A current applied in the system during charging-discharging test to analyze the relationship of th...

Hydroxyapatite (HAp) is a bioceramic that can be applied for bone tissue regeneration. The hydroxyapatite scaffold has poor biodegradation. To increase the biodegradation of HAp, we composited it with PVA, Chitosan, and PEG polymers, which have faster biodegradation properties. PVA/CS/PEG/HAp composites nanofibers as a scaffold in bone tissue engin...

The wettability of material can change from hydrophobic to hydrophilic when treated using plasma nitrogen. The present work investigated the influence of the plasma treatment duration on the modification of polystyrene’s surface coating on a glass surface. The polystyrene layer was produced by means of spin coating method with the rotational speed...

A hollow cathode has been one of the methods to intensify the plasma in the etching or ashing process. This work examined a number of technologies in the intensification of a 2 MHz RF glow discharge plasma to deposit carbon film by means of the hollow cathode. Three types of the cathode configurations, which were cylindrical, rectangular and a cyli...

Germanene, which has the same structure as graphene, is an exciting novel 2D functionalized material that controls its band gap using functionalization. The effects of the Ga atom and hydrogen atoms on the structure of Ga-doped H-passivated germanene were investigated with a density functional theory (DFT) calculation. H-passivated germanene has a...

The effect of different solvents and solution concentration on viscoelastic behaviour and morphology of polyaniline (PANi) coating was investigated in this study. The PANi coating on a QCM sensor was created by spin coating with various solvents, such as NMP, m-cresol, and DMF with varying concentrations of 1-4% by weight of PANi. The viscoelastic...

A photodetector performance as a light sensor based on the design and material of DSSC (Dye-Sensitized Solar Cell) has been characterized. Oxide Semiconductor nanoparticle of TiO 2 and extracted natural dye are used to absorb and convert incident photon to electric energy using a sandwich structure of 1.5 x 1.5 cm ² active area. The sensor material...

Nitrogen plasma treatment was carried out to modify the surface of polystyrene film deposited on a quartz crystal microbalance (QCM) sensor. The modification was intended to enhance the wettability of the film by inducing the formation of CN functional group on its surface. This work investigated the effect of DC bias controlling N* in the plasma o...

The high density of RF-DC plasma N2-H2 was used to make precise micro-texturing onto AISI420 has complex textured geometry. The original 2D micro-patterns were drawn onto substrate surface by maskless patterning using by of nano-carbon ink. These micro-patterned specimens were further plasma-nitrided at 673 K for 5.4 ks by 70 Pa using the hollow ca...

The RF-DC plasma N2-H2 was used to make precise AISI420 molds and dies have complex textured geometry. The quality of the molds and dies directly affect the quality of the produced parts. The excellent examples of molds were used for injection molding lenses and dies used for the precision forging of automotive drive train components. In this study...

This research aimed at investigating Fe 2 MO 4 ferrofluids nanostructure, with M was Fe, Ti and Cr. Fe 2 MO 4 nanoparticles were synthesized through coprecipitation method, and the phase and crystallinity were analyzed using XRD instrument. The obtained results showed the Fe 3 O 4 phase, but there was a shift in diffraction peak position contribute...

Polystyrene (PS) thin film with various concentration of mass (1%, 3%, and 5%) has been deposited onto Quartz Crystal Microbalance (QCM) surface by a spin coating method. The purpose of this research is the improvement of Bovine Serum Albumin (BSA) immobilization into the QCM surface. The QCM resonance frequency has been investigated by means of Im...

A plasma treatment of polymeric materials has become one of the most important methods to enhance the surface wettability without affecting the bulk material features. Oxygen plasma treatment of polystyrene surfaces deposited on a QCM sensor was evaluated by relating the plasma parameters, surface roughness, and the wettability. The internal plasma...

In this present study, we report the fabrication of biphasic calcium phosphate (hydroxyapatite-tricalcium phosphate), abbreviated as BCP. The BCP was composited with alumina by grinding process and continuously sintering at 1200 °C for 2 hours. The sintering triggered the partial changes of crystalline phase from hydroxyapatite to tricalcium phosph...

In general, seashells can contain calcium up to 97.19%. Therefore, it is potentially as a calcium source for nano-HA production. In this work, nano-HA was produced by sonochemical method with a period of sonication for 2 hours. Furthermore, nano-HA was composited with chitosan by a sonochemical method with a period of sonication for 2 hrs. Some fun...

PM 0.1 (ultrafine particles) emitted by motorcycles have been known as the major contributors to air pollution, and have a harmful impact on human health. Therefore, there is a need to decrease the concentration in the ambient air. In this study, we developed an ultrafine particle filter that was made of banana leaf powder (F b) and water hyacinth...

A polystyrene film can swell in contact with the buffer solution. It will affect the microstructure of PS during the contact and resulted in a frequency change of the QCM coated with polystyrene. Phosphate buffered saline and tris-hydrochloride solutions were used to observe the swelling behavior of 192 kDa PS coating annealed from 100 °C to 200 °C...

A study of polystyrene polymer pattern onto the QCM produced using ultrasonic spray coating was presented. The patterned polymer coating was expected to be produced using the ultrasonic spray coating. The form of the 3D structure of the coating was observed using non-contact profilometer. The damping of the coating to the QCM sensor was measured th...

Wettability of the polystyrene coating on quartz crystal microbalance (QCM) surface was one of the important properties for chemical sensors and biosensors. QCM sensor coated with polystyrene was treated using oxygen plasma working at 2 MHz. The oxygen plasma changes the surface wettability and formed polar groups at polystyrene surface. The contac...